restructuring towards python client library #455 (#613)

* python client library clean branch for PR. #455 * removed superfluous file. #455 * removed one more superfluous file. #455 * README.md, .pylintrc and pylint based fixes. #455 * updated wrt. to the review comments. #455 * removed pylint documentation duplication. #455
2022-01-22 00:08:29 +01:00 · 2022-01-22 00:08:29 +01:00 · 089dc302e5
parent 7f362c9308
commit 089dc302e5
38 changed files with 1573 additions and 1467 deletions
--- a/.gitignore
+++ b/.gitignore
@ -5,11 +5,12 @@ core
 .DS_Store
 *.swp
 __pycache__
-python/web/current
-python/web/src/rascsi_interface_pb2.py
-python/oled/current
-python/oled/src/rascsi_interface_pb2.py
+current
+rascsi_interface_pb2.py
 src/raspberrypi/hfdisk/
 *~
 messages.pot
 messages.mo
+
+# temporary user files
+s.sh
--- a/easyinstall.sh
+++ b/easyinstall.sh
@ -52,6 +52,7 @@ VIRTUAL_DRIVER_PATH="$HOME/images"
 CFG_PATH="$HOME/.config/rascsi"
 WEB_INSTALL_PATH="$BASE/python/web"
 OLED_INSTALL_PATH="$BASE/python/oled"
+PYTHON_COMMON_PATH="$BASE/python/common"
 SYSTEMD_PATH="/etc/systemd/system"
 HFS_FORMAT=/usr/bin/hformat
 HFDISK_BIN=/usr/bin/hfdisk
@ -94,15 +95,17 @@ function installRaScsi() {
    sudo make install CONNECT_TYPE="${CONNECT_TYPE:-FULLSPEC}" </dev/null
 }

-# install everything required to run an HTTP server (Nginx + Python Flask App)
-function installRaScsiWebInterface() {
-    if [ -f "$WEB_INSTALL_PATH/rascsi_interface_pb2.py" ]; then
-        sudo rm "$WEB_INSTALL_PATH/rascsi_interface_pb2.py"
+function preparePythonCommon() {
+    if [ -f "$PYTHON_COMMON_PATH/rascsi_interface_pb2.py" ]; then
+        sudo rm "$PYTHON_COMMON_PATH/rascsi_interface_pb2.py"
        echo "Deleting old Python protobuf library rascsi_interface_pb2.py"
    fi
    echo "Compiling the Python protobuf library rascsi_interface_pb2.py..."
-    protoc -I="$BASE/src/raspberrypi/" --python_out="$WEB_INSTALL_PATH/src" rascsi_interface.proto
+    protoc -I="$BASE/src/raspberrypi/" --python_out="$PYTHON_COMMON_PATH/src" rascsi_interface.proto
+}

+# install everything required to run an HTTP server (Nginx + Python Flask App)
+function installRaScsiWebInterface() {
    sudo cp -f "$WEB_INSTALL_PATH/service-infra/nginx-default.conf" /etc/nginx/sites-available/default
    sudo cp -f "$WEB_INSTALL_PATH/service-infra/502.html" /var/www/html/502.html

@ -779,13 +782,6 @@ function installRaScsiScreen() {

    sudo apt-get update && sudo apt-get install libjpeg-dev libpng-dev libopenjp2-7-dev i2c-tools raspi-config -y </dev/null

-    if [ -f "$OLED_INSTALL_PATH/src/rascsi_interface_pb2.py" ]; then
-        sudo rm "$OLED_INSTALL_PATH/src/rascsi_interface_pb2.py"
-        echo "Deleting old Python protobuf library rascsi_interface_pb2.py"
-    fi
-    echo "Compiling the Python protobuf library rascsi_interface_pb2.py..."
-    protoc -I="$BASE/src/raspberrypi/" --python_out="$OLED_INSTALL_PATH/src" rascsi_interface.proto
-
    if [[ $(grep -c "^dtparam=i2c_arm=on" /boot/config.txt) -ge 1 ]]; then
        echo "NOTE: I2C support seems to have been configured already."
        REBOOT=0
@ -882,6 +878,7 @@ function runChoice() {
              backupRaScsiService
              installRaScsi
              enableRaScsiService
+              preparePythonCommon
              if [[ $(isRaScsiScreenInstalled) -eq 0 ]]; then
                  echo "Detected rascsi oled service; will run the installation steps for the OLED monitor."
                  installRaScsiScreen
@ -913,6 +910,7 @@ function runChoice() {
              stopRaScsi
              compileRaScsi
              backupRaScsiService
+              preparePythonCommon
              installRaScsi
              enableRaScsiService
              if [[ $(isRaScsiScreenInstalled) -eq 0 ]]; then
@ -931,6 +929,7 @@ function runChoice() {
              echo "- Add and modify systemd services"
              echo "- Modify the Raspberry Pi boot configuration (may require a reboot)"
              sudoCheck
+              preparePythonCommon
              installRaScsiScreen
              showRaScsiScreenStatus
              echo "Installing / Updating RaSCSI OLED Screen - Complete!"
@ -1018,6 +1017,7 @@ function runChoice() {
              updateRaScsiGit
              createCfgDir
              installPackages
+              preparePythonCommon
              installRaScsiWebInterface
              echo "Configuring RaSCSI Web Interface stand-alone - Complete!"
              echo "Launch the Web Interface with the 'start.sh' script. To use a custom port for the web server: 'start.sh --port=8081"
--- a/python/.pylintrc
+++ b/python/.pylintrc
@ -7,7 +7,7 @@ extension-pkg-whitelist=

 # Add files or directories to the blacklist. They should be base names, not
 # paths.
-ignore=CVS
+ignore=CVS,rascsi_interface_pb2.py

 # Add files or directories matching the regex patterns to the blacklist. The
 # regex matches against base names, not paths.
@ -15,7 +15,7 @@ ignore-patterns=

 # Python code to execute, usually for sys.path manipulation such as
 # pygtk.require().
-init-hook=
+init-hook=import sys; sys.path.append("common/src"); sys.path.append("web/src"); sys.path.append("oled/src");
 # venv hook for pylint
 # Requires pylint-venv package:
 # $ pip install pylint-venv
--- a/python/README.md
+++ b/python/README.md
@ -0,0 +1,32 @@
+# RaSCSI Python Apps 
+
+This directory contains Python-based clients for RaSCSI as well as common 
+packages that are shared among the clients. 
+
+The following paragraphs in this README contain instructions that are shared 
+among all Python apps.
+
+### Static analysis with pylint
+
+It is recommended to run pylint against new code to protect against bugs
+and keep the code readable and maintainable.
+The local pylint configuration lives in .pylintrc.
+In order for pylint to recognize venv libraries, the pylint-venv package is required.
+
+```
+sudo apt install pylint3
+sudo pip install pylint-venv
+source venv/bin/activate
+pylint3 python_source_file.py
+```
+
+Examples:
+```
+# check a single file
+pylint web/src/web.py
+
+# check the python modules
+pylint common/src
+pylint web/src
+pylint oled/src
+```
--- a/python/common/src/.gitkeep
+++ b/python/common/src/.gitkeep
--- a/python/common/requirements.txt
+++ b/python/common/requirements.txt
@ -0,0 +1,2 @@
+protobuf==3.19.3
+requests==2.26.0
--- a/python/common/src/README.md
+++ b/python/common/src/README.md
@ -0,0 +1,30 @@
+# RaSCSI Common Python Module
+
+The common module contains python modules that are shared among multiple Python 
+applications such as the OLED or the Web application. It contains shared functionality.
+For example, the rascsi python module provides functionality for accessing rascsi through its
+protobuf interface and provides convenient classes for that purpose. 
+
+### Usage
+
+To make use of the rascsi python module, it needs to be found by the Python scripts using it. 
+This can be achieved in multiple ways. One way is to simply adapt the PYTHONPATH environment
+variable to include the common/src directory:
+
+```
+PYTHON_COMMON_PATH=${path_to_common_directory}/common/src
+export PYTHONPATH=$PWD:${PYTHON_COMMON_PATH}
+python3 myapp.py
+```
+
+The most interesting functions are likely found in the classes RaCtlCmds and FileCmds. Classes
+can be instantiated, for example, as follows 
+(assuming that rascsi host, rascsi port and token are somehow retrieved from a command line 
+argument):
+
+```
+sock_cmd = SocketCmds(host=args.rascsi_host, port=args.rascsi_port)
+ractl_cmd = RaCtlCmds(sock_cmd=sock_cmd, token=args.token)
+```
+
+Usage examples can be found in the existing RaSCSI Python applications.
--- a/python/common/src/init.py
+++ b/python/common/src/init.py
--- a/python/common/src/rascsi/init.py
+++ b/python/common/src/rascsi/init.py
--- a/python/common/src/rascsi/common_settings.py
+++ b/python/common/src/rascsi/common_settings.py
@ -0,0 +1,21 @@
+"""
+Module for general settings used in the rascsi module
+"""
+
+from os import getcwd
+
+WORK_DIR = getcwd()
+
+REMOVABLE_DEVICE_TYPES = ("SCCD", "SCRM", "SCMO")
+
+# There may be a more elegant way to get the HOME dir of the user that installed RaSCSI
+HOME_DIR = "/".join(WORK_DIR.split("/")[0:3])
+CFG_DIR = f"{HOME_DIR}/.config/rascsi"
+CONFIG_FILE_SUFFIX = "json"
+
+# File ending used for drive properties files
+PROPERTIES_SUFFIX = "properties"
+
+# The RESERVATIONS list is used to keep track of the reserved ID memos.
+# Initialize with a list of 8 empty strings.
+RESERVATIONS = ["" for x in range(0, 8)]
--- a/python/common/src/rascsi/exceptions.py
+++ b/python/common/src/rascsi/exceptions.py
@ -0,0 +1,15 @@
+"""
+Module for custom exceptions raised by the rascsi module
+"""
+
+
+class FailedSocketConnectionException(Exception):
+    """Raise when a rascsi protobuf socket connection cannot be established after multiple tries."""
+
+
+class EmptySocketChunkException(Exception):
+    """Raise when a socket payload contains an empty chunk which implies a possible problem. """
+
+
+class InvalidProtobufResponse(Exception):
+    """Raise when a rascsi socket payload contains unpexpected data. """
--- a/python/common/src/rascsi/file_cmds.py
+++ b/python/common/src/rascsi/file_cmds.py
@ -0,0 +1,601 @@
+"""
+Module for methods reading from and writing to the file system
+"""
+
+import os
+import logging
+from pathlib import PurePath
+import asyncio
+import rascsi_interface_pb2 as proto
+from rascsi.common_settings import CFG_DIR, CONFIG_FILE_SUFFIX, PROPERTIES_SUFFIX, RESERVATIONS
+from rascsi.ractl_cmds import RaCtlCmds
+from rascsi.return_codes import ReturnCodes
+from rascsi.socket_cmds import SocketCmds
+
+
+class FileCmds:
+    """
+    class for methods reading from and writing to the file system
+    """
+
+    def __init__(self, sock_cmd: SocketCmds, ractl: RaCtlCmds, token=None, locale=None):
+        self.sock_cmd = sock_cmd
+        self.ractl = ractl
+        self.token = token
+        self.locale = locale
+
+    # noinspection PyMethodMayBeStatic
+    # pylint: disable=no-self-use
+    def list_files(self, file_types, dir_path):
+        """
+        Takes a (list) or (tuple) of (str) file_types - e.g. ('hda', 'hds')
+        Returns (list) of (list)s files_list:
+        index 0 is (str) file name and index 1 is (int) size in bytes
+        """
+        files_list = []
+        for path, _dirs, files in os.walk(dir_path):
+            # Only list selected file types
+            files = [f for f in files if f.lower().endswith(file_types)]
+            files_list.extend(
+                [
+                    (
+                        file,
+                        os.path.getsize(os.path.join(path, file))
+                    )
+                    for file in files
+                ]
+            )
+        return files_list
+
+    # noinspection PyMethodMayBeStatic
+    def list_config_files(self):
+        """
+        Finds fils with file ending CONFIG_FILE_SUFFIX in CFG_DIR.
+        Returns a (list) of (str) files_list
+        """
+        files_list = []
+        for _root, _dirs, files in os.walk(CFG_DIR):
+            for file in files:
+                if file.endswith("." + CONFIG_FILE_SUFFIX):
+                    files_list.append(file)
+        return files_list
+
+    def list_images(self):
+        """
+        Sends a IMAGE_FILES_INFO command to the server
+        Returns a (dict) with (bool) status, (str) msg, and (list) of (dict)s files
+
+        """
+        command = proto.PbCommand()
+        command.operation = proto.PbOperation.DEFAULT_IMAGE_FILES_INFO
+        command.params["token"] = self.token
+        command.params["locale"] = self.locale
+
+        data = self.sock_cmd.send_pb_command(command.SerializeToString())
+        result = proto.PbResult()
+        result.ParseFromString(data)
+
+        # Get a list of all *.properties files in CFG_DIR
+        prop_data = self.list_files(PROPERTIES_SUFFIX, CFG_DIR)
+        prop_files = [PurePath(x[0]).stem for x in prop_data]
+
+        from zipfile import ZipFile, is_zipfile
+        server_info = self.ractl.get_server_info()
+        files = []
+        for file in result.image_files_info.image_files:
+            # Add properties meta data for the image, if applicable
+            if file.name in prop_files:
+                process = self.read_drive_properties(f"{CFG_DIR}/{file.name}.{PROPERTIES_SUFFIX}")
+                prop = process["conf"]
+            else:
+                prop = False
+            if file.name.lower().endswith(".zip"):
+                zip_path = f"{server_info['image_dir']}/{file.name}"
+                if is_zipfile(zip_path):
+                    zipfile = ZipFile(zip_path)
+                    # Get a list of (str) containing all zipfile members
+                    zip_members = zipfile.namelist()
+                    # Strip out directories from the list
+                    zip_members = [x for x in zip_members if not x.endswith("/")]
+                else:
+                    logging.warning("%s is an invalid zip file", zip_path)
+                    zip_members = False
+            else:
+                zip_members = False
+
+            size_mb = "{:,.1f}".format(file.size / 1024 / 1024)
+            dtype = proto.PbDeviceType.Name(file.type)
+            files.append({
+                "name": file.name,
+                "size": file.size,
+                "size_mb": size_mb,
+                "detected_type": dtype,
+                "prop": prop,
+                "zip_members": zip_members,
+                })
+
+        return {"status": result.status, "msg": result.msg, "files": files}
+
+    def create_new_image(self, file_name, file_type, size):
+        """
+        Takes (str) file_name, (str) file_type, and (int) size
+        Sends a CREATE_IMAGE command to the server
+        Returns (dict) with (bool) status and (str) msg
+        """
+        command = proto.PbCommand()
+        command.operation = proto.PbOperation.CREATE_IMAGE
+        command.params["token"] = self.token
+        command.params["locale"] = self.locale
+
+        command.params["file"] = file_name + "." + file_type
+        command.params["size"] = str(size)
+        command.params["read_only"] = "false"
+
+        data = self.sock_cmd.send_pb_command(command.SerializeToString())
+        result = proto.PbResult()
+        result.ParseFromString(data)
+        return {"status": result.status, "msg": result.msg}
+
+    def delete_image(self, file_name):
+        """
+        Takes (str) file_name
+        Sends a DELETE_IMAGE command to the server
+        Returns (dict) with (bool) status and (str) msg
+        """
+        command = proto.PbCommand()
+        command.operation = proto.PbOperation.DELETE_IMAGE
+        command.params["token"] = self.ractl.token
+        command.params["locale"] = self.ractl.locale
+
+        command.params["file"] = file_name
+
+        data = self.sock_cmd.send_pb_command(command.SerializeToString())
+        result = proto.PbResult()
+        result.ParseFromString(data)
+        return {"status": result.status, "msg": result.msg}
+
+    def rename_image(self, file_name, new_file_name):
+        """
+        Takes (str) file_name, (str) new_file_name
+        Sends a RENAME_IMAGE command to the server
+        Returns (dict) with (bool) status and (str) msg
+        """
+        command = proto.PbCommand()
+        command.operation = proto.PbOperation.RENAME_IMAGE
+        command.params["token"] = self.ractl.token
+        command.params["locale"] = self.ractl.locale
+
+        command.params["from"] = file_name
+        command.params["to"] = new_file_name
+
+        data = self.sock_cmd.send_pb_command(command.SerializeToString())
+        result = proto.PbResult()
+        result.ParseFromString(data)
+        return {"status": result.status, "msg": result.msg}
+
+    # noinspection PyMethodMayBeStatic
+    def delete_file(self, file_path):
+        """
+        Takes (str) file_path with the full path to the file to delete
+        Returns (dict) with (bool) status and (str) msg
+        """
+        parameters = {
+            "file_path": file_path
+        }
+        if os.path.exists(file_path):
+            os.remove(file_path)
+            return {
+                    "status": True,
+                    "return_code": ReturnCodes.DELETEFILE_SUCCESS,
+                    "parameters": parameters,
+                }
+        return {
+                "status": False,
+                "return_code": ReturnCodes.DELETEFILE_FILE_NOT_FOUND,
+                "parameters": parameters,
+            }
+
+    # noinspection PyMethodMayBeStatic
+    def rename_file(self, file_path, target_path):
+        """
+        Takes (str) file_path and (str) target_path
+        Returns (dict) with (bool) status and (str) msg
+        """
+        parameters = {
+            "target_path": target_path
+        }
+        if os.path.exists(PurePath(target_path).parent):
+            os.rename(file_path, target_path)
+            return {
+                "status": True,
+                "return_code": ReturnCodes.RENAMEFILE_SUCCESS,
+                "parameters": parameters,
+                }
+        return {
+            "status": False,
+            "return_code": ReturnCodes.RENAMEFILE_UNABLE_TO_MOVE,
+            "parameters": parameters,
+            }
+
+    def unzip_file(self, file_name, member=False, members=False):
+        """
+        Takes (str) file_name, optional (str) member, optional (list) of (str) members
+        file_name is the name of the zip file to unzip
+        member is the full path to the particular file in the zip file to unzip
+        members contains all of the full paths to each of the zip archive members
+        Returns (dict) with (boolean) status and (list of str) msg
+        """
+        from asyncio import run
+        server_info = self.ractl.get_server_info()
+        prop_flag = False
+
+        if not member:
+            unzip_proc = run(self.run_async(
+                f"unzip -d {server_info['image_dir']} -n -j "
+                f"{server_info['image_dir']}/{file_name}"
+                ))
+            if members:
+                for path in members:
+                    if path.endswith(PROPERTIES_SUFFIX):
+                        name = PurePath(path).name
+                        self.rename_file(f"{server_info['image_dir']}/{name}", f"{CFG_DIR}/{name}")
+                        prop_flag = True
+        else:
+            from re import escape
+            member = escape(member)
+            unzip_proc = run(self.run_async(
+                f"unzip -d {server_info['image_dir']} -n -j "
+                f"{server_info['image_dir']}/{file_name} {member}"
+                ))
+            # Attempt to unzip a properties file in the same archive dir
+            unzip_prop = run(self.run_async(
+                f"unzip -d {CFG_DIR} -n -j "
+                f"{server_info['image_dir']}/{file_name} {member}.{PROPERTIES_SUFFIX}"
+                ))
+            if unzip_prop["returncode"] == 0:
+                prop_flag = True
+        if unzip_proc["returncode"] != 0:
+            logging.warning("Unzipping failed: %s", unzip_proc["stderr"])
+            return {"status": False, "msg": unzip_proc["stderr"]}
+
+        from re import findall
+        unzipped = findall(
+            "(?:inflating|extracting):(.+)\n",
+            unzip_proc["stdout"]
+            )
+        return {"status": True, "msg": unzipped, "prop_flag": prop_flag}
+
+    def download_file_to_iso(self, url, *iso_args):
+        """
+        Takes (str) url and one or more (str) *iso_args
+        Returns (dict) with (bool) status and (str) msg
+        """
+        from time import time
+        from subprocess import run, CalledProcessError
+
+        server_info = self.ractl.get_server_info()
+
+        file_name = PurePath(url).name
+        tmp_ts = int(time())
+        tmp_dir = "/tmp/" + str(tmp_ts) + "/"
+        os.mkdir(tmp_dir)
+        tmp_full_path = tmp_dir + file_name
+        iso_filename = f"{server_info['image_dir']}/{file_name}.iso"
+
+        req_proc = self.download_to_dir(url, tmp_dir, file_name)
+
+        if not req_proc["status"]:
+            return {"status": False, "msg": req_proc["msg"]}
+
+        from zipfile import is_zipfile, ZipFile
+        if is_zipfile(tmp_full_path):
+            if "XtraStuf.mac" in str(ZipFile(tmp_full_path).namelist()):
+                logging.info("MacZip file format detected. Will not unzip to retain resource fork.")
+            else:
+                logging.info(
+                    "%s is a zipfile! Will attempt to unzip and store the resulting files.",
+                    tmp_full_path,
+                    )
+                unzip_proc = asyncio.run(self.run_async(
+                    f"unzip -d {tmp_dir} -n {tmp_full_path}"
+                    ))
+                if not unzip_proc["returncode"]:
+                    logging.info(
+                        "%s was successfully unzipped. Deleting the zipfile.",
+                        tmp_full_path,
+                        )
+                    self.delete_file(tmp_full_path)
+
+        try:
+            run(
+                [
+                    "genisoimage",
+                    *iso_args,
+                    "-o",
+                    iso_filename,
+                    tmp_dir,
+                ],
+                capture_output=True,
+                check=True,
+            )
+        except CalledProcessError as error:
+            logging.warning("Executed shell command: %s", " ".join(error.cmd))
+            logging.warning("Got error: %s", error.stderr.decode("utf-8"))
+            return {"status": False, "msg": error.stderr.decode("utf-8")}
+
+        parameters = {
+            "value": " ".join(iso_args)
+        }
+        return {
+            "status": True,
+            "return_code": ReturnCodes.DOWNLOADFILETOISO_SUCCESS,
+            "parameters": parameters,
+            "file_name": iso_filename,
+        }
+
+    # noinspection PyMethodMayBeStatic
+    def download_to_dir(self, url, save_dir, file_name):
+        """
+        Takes (str) url, (str) save_dir, (str) file_name
+        Returns (dict) with (bool) status and (str) msg
+        """
+        import requests
+        logging.info("Making a request to download %s", url)
+
+        try:
+            with requests.get(url, stream=True, headers={"User-Agent": "Mozilla/5.0"}) as req:
+                req.raise_for_status()
+                with open(f"{save_dir}/{file_name}", "wb") as download:
+                    for chunk in req.iter_content(chunk_size=8192):
+                        download.write(chunk)
+        except requests.exceptions.RequestException as error:
+            logging.warning("Request failed: %s", str(error))
+            return {"status": False, "msg": str(error)}
+
+        logging.info("Response encoding: %s", req.encoding)
+        logging.info("Response content-type: %s", req.headers["content-type"])
+        logging.info("Response status code: %s", req.status_code)
+
+        parameters = {
+            "file_name": file_name,
+            "save_dir": save_dir
+        }
+        return {
+            "status": True,
+            "return_code": ReturnCodes.DOWNLOADTODIR_SUCCESS,
+            "parameters": parameters,
+        }
+
+    def write_config(self, file_name):
+        """
+        Takes (str) file_name
+        Returns (dict) with (bool) status and (str) msg
+        """
+        from json import dump
+        file_name = f"{CFG_DIR}/{file_name}"
+        try:
+            with open(file_name, "w", encoding="ISO-8859-1") as json_file:
+                version = self.ractl.get_server_info()["version"]
+                devices = self.ractl.list_devices()["device_list"]
+                for device in devices:
+                    # Remove keys that we don't want to store in the file
+                    del device["status"]
+                    del device["file"]
+                    # It's cleaner not to store an empty parameter for every device without media
+                    if device["image"] == "":
+                        device["image"] = None
+                    # RaSCSI product names will be generated on the fly by RaSCSI
+                    if device["vendor"] == "RaSCSI":
+                        device["vendor"] = device["product"] = device["revision"] = None
+                    # A block size of 0 is how RaSCSI indicates N/A for block size
+                    if device["block_size"] == 0:
+                        device["block_size"] = None
+                    # Convert to a data type that can be serialized
+                    device["params"] = dict(device["params"])
+                reserved_ids_and_memos = []
+                reserved_ids = self.ractl.get_reserved_ids()["ids"]
+                for scsi_id in reserved_ids:
+                    reserved_ids_and_memos.append({"id": scsi_id,
+                                                   "memo": RESERVATIONS[int(scsi_id)]})
+                dump(
+                    {"version": version,
+                     "devices": devices,
+                     "reserved_ids": reserved_ids_and_memos},
+                    json_file,
+                    indent=4
+                    )
+            parameters = {
+                "file_name": file_name
+            }
+            return {
+                "status": True,
+                "return_code": ReturnCodes.WRITECONFIG_SUCCESS,
+                "parameters": parameters,
+                }
+        except (IOError, ValueError, EOFError, TypeError) as error:
+            logging.error(str(error))
+            self.delete_file(file_name)
+            return {"status": False, "msg": str(error)}
+        except:
+            logging.error("Could not write to file: %s", file_name)
+            self.delete_file(file_name)
+            parameters = {
+                "file_name": file_name
+            }
+            return {
+                "status": False,
+                "return_code": ReturnCodes.WRITECONFIG_COULD_NOT_WRITE,
+                "parameters": parameters,
+                }
+
+    def read_config(self, file_name):
+        """
+        Takes (str) file_name
+        Returns (dict) with (bool) status and (str) msg
+        """
+        from json import load
+        file_name = f"{CFG_DIR}/{file_name}"
+        try:
+            with open(file_name, encoding="ISO-8859-1") as json_file:
+                config = load(json_file)
+                # If the config file format changes again in the future,
+                # introduce more sophisticated format detection logic here.
+                if isinstance(config, dict):
+                    self.ractl.detach_all()
+                    ids_to_reserve = []
+                    for item in config["reserved_ids"]:
+                        ids_to_reserve.append(item["id"])
+                        RESERVATIONS[int(item["id"])] = item["memo"]
+                    self.ractl.reserve_scsi_ids(ids_to_reserve)
+                    for row in config["devices"]:
+                        kwargs = {
+                            "device_type": row["device_type"],
+                            "image": row["image"],
+                            "unit": int(row["unit"]),
+                            "vendor": row["vendor"],
+                            "product": row["product"],
+                            "revision": row["revision"],
+                            "block_size": row["block_size"],
+                            }
+                        params = dict(row["params"])
+                        for param in params.keys():
+                            kwargs[param] = params[param]
+                        self.ractl.attach_image(row["id"], **kwargs)
+                # The config file format in RaSCSI 21.10 is using a list data type at the top level.
+                # If future config file formats return to the list data type,
+                # introduce more sophisticated format detection logic here.
+                elif isinstance(config, list):
+                    self.ractl.detach_all()
+                    for row in config:
+                        kwargs = {
+                            "device_type": row["device_type"],
+                            "image": row["image"],
+                            # "un" for backwards compatibility
+                            "unit": int(row["un"]),
+                            "vendor": row["vendor"],
+                            "product": row["product"],
+                            "revision": row["revision"],
+                            "block_size": row["block_size"],
+                            }
+                        params = dict(row["params"])
+                        for param in params.keys():
+                            kwargs[param] = params[param]
+                        self.ractl.attach_image(row["id"], **kwargs)
+                else:
+                    return {"status": False,
+                            "return_code": ReturnCodes.READCONFIG_INVALID_CONFIG_FILE_FORMAT}
+
+                parameters = {
+                    "file_name": file_name
+                }
+                return {
+                    "status": True,
+                    "return_code": ReturnCodes.READCONFIG_SUCCESS,
+                    "parameters": parameters
+                    }
+        except (IOError, ValueError, EOFError, TypeError) as error:
+            logging.error(str(error))
+            return {"status": False, "msg": str(error)}
+        except:
+            logging.error("Could not read file: %s", file_name)
+            parameters = {
+                "file_name": file_name
+            }
+            return {
+                "status": False,
+                "return_code": ReturnCodes.READCONFIG_COULD_NOT_READ,
+                "parameters": parameters
+                }
+
+    def write_drive_properties(self, file_name, conf):
+        """
+        Writes a drive property configuration file to the config dir.
+        Takes file name base (str) and (list of dicts) conf as arguments
+        Returns (dict) with (bool) status and (str) msg
+        """
+        from json import dump
+        file_path = f"{CFG_DIR}/{file_name}"
+        try:
+            with open(file_path, "w") as json_file:
+                dump(conf, json_file, indent=4)
+            parameters = {
+                "file_path": file_path
+            }
+            return {
+                "status": True,
+                "return_code": ReturnCodes.WRITEDRIVEPROPS_SUCCESS,
+                "parameters": parameters,
+                }
+        except (IOError, ValueError, EOFError, TypeError) as error:
+            logging.error(str(error))
+            self.delete_file(file_path)
+            return {"status": False, "msg": str(error)}
+        except:
+            logging.error("Could not write to file: %s", file_path)
+            self.delete_file(file_path)
+            parameters = {
+                "file_path": file_path
+            }
+            return {
+                "status": False,
+                "return_code": ReturnCodes.WRITEDRIVEPROPS_COULD_NOT_WRITE,
+                "parameters": parameters,
+                }
+
+    # noinspection PyMethodMayBeStatic
+    def read_drive_properties(self, file_path):
+        """
+        Reads drive properties from json formatted file.
+        Takes (str) file_path as argument.
+        Returns (dict) with (bool) status, (str) msg, (dict) conf
+        """
+        from json import load
+        try:
+            with open(file_path) as json_file:
+                conf = load(json_file)
+                parameters = {
+                    "file_path": file_path
+                }
+                return {
+                    "status": True,
+                    "return_codes": ReturnCodes.READDRIVEPROPS_SUCCESS,
+                    "parameters": parameters,
+                    "conf": conf,
+                    }
+        except (IOError, ValueError, EOFError, TypeError) as error:
+            logging.error(str(error))
+            return {"status": False, "msg": str(error)}
+        except:
+            logging.error("Could not read file: %s", file_path)
+            parameters = {
+                "file_path": file_path
+            }
+            return {
+                "status": False,
+                "return_codes": ReturnCodes.READDRIVEPROPS_COULD_NOT_READ,
+                "parameters": parameters,
+                }
+
+    # noinspection PyMethodMayBeStatic
+    async def run_async(self, cmd):
+        """
+        Takes (str) cmd with the shell command to execute
+        Executes shell command and captures output
+        Returns (dict) with (int) returncode, (str) stdout, (str) stderr
+        """
+        proc = await asyncio.create_subprocess_shell(
+            cmd,
+            stdout=asyncio.subprocess.PIPE,
+            stderr=asyncio.subprocess.PIPE)
+
+        stdout, stderr = await proc.communicate()
+
+        logging.info("Executed command \"%s\" with status code %d", cmd, proc.returncode)
+        if stdout:
+            stdout = stdout.decode()
+            logging.info("stdout: %s", stdout)
+        if stderr:
+            stderr = stderr.decode()
+            logging.info("stderr: %s", stderr)
+
+        return {"returncode": proc.returncode, "stdout": stdout, "stderr": stderr}
--- a/python/common/src/rascsi/ractl_cmds.py
+++ b/python/common/src/rascsi/ractl_cmds.py
@ -0,0 +1,444 @@
+"""
+Module for commands sent to the RaSCSI backend service.
+"""
+
+import rascsi_interface_pb2 as proto
+from rascsi.common_settings import REMOVABLE_DEVICE_TYPES
+from rascsi.return_codes import ReturnCodes
+from rascsi.socket_cmds import SocketCmds
+
+
+class RaCtlCmds:
+    """
+    Class for commands sent to the RaSCSI backend service.
+    """
+    def __init__(self, sock_cmd: SocketCmds, token=None, locale="en"):
+        self.sock_cmd = sock_cmd
+        self.token = token
+        self.locale = locale
+
+    def get_server_info(self):
+        """
+        Sends a SERVER_INFO command to the server.
+        Returns a dict with:
+        - (bool) status
+        - (str) version (RaSCSI version number)
+        - (list) of (str) log_levels (the log levels RaSCSI supports)
+        - (str) current_log_level
+        - (list) of (int) reserved_ids
+        - (str) image_dir, path to the default images directory
+        - (int) scan_depth, the current images directory scan depth
+        - 5 distinct (list)s of (str)s with file endings recognized by RaSCSI
+        """
+        command = proto.PbCommand()
+        command.operation = proto.PbOperation.SERVER_INFO
+        command.params["token"] = self.token
+        command.params["locale"] = self.locale
+
+        data = self.sock_cmd.send_pb_command(command.SerializeToString())
+        result = proto.PbResult()
+        result.ParseFromString(data)
+        version = (str(result.server_info.version_info.major_version) + "." +
+                   str(result.server_info.version_info.minor_version) + "." +
+                   str(result.server_info.version_info.patch_version))
+        log_levels = result.server_info.log_level_info.log_levels
+        current_log_level = result.server_info.log_level_info.current_log_level
+        reserved_ids = list(result.server_info.reserved_ids_info.ids)
+        image_dir = result.server_info.image_files_info.default_image_folder
+        scan_depth = result.server_info.image_files_info.depth
+
+        # Creates lists of file endings recognized by RaSCSI
+        mappings = result.server_info.mapping_info.mapping
+        sahd = []
+        schd = []
+        scrm = []
+        scmo = []
+        sccd = []
+        for dtype in mappings:
+            if mappings[dtype] == proto.PbDeviceType.SAHD:
+                sahd.append(dtype)
+            elif mappings[dtype] == proto.PbDeviceType.SCHD:
+                schd.append(dtype)
+            elif mappings[dtype] == proto.PbDeviceType.SCRM:
+                scrm.append(dtype)
+            elif mappings[dtype] == proto.PbDeviceType.SCMO:
+                scmo.append(dtype)
+            elif mappings[dtype] == proto.PbDeviceType.SCCD:
+                sccd.append(dtype)
+
+        return {
+            "status": result.status,
+            "version": version,
+            "log_levels": log_levels,
+            "current_log_level": current_log_level,
+            "reserved_ids": reserved_ids,
+            "image_dir": image_dir,
+            "scan_depth": scan_depth,
+            "sahd": sahd,
+            "schd": schd,
+            "scrm": scrm,
+            "scmo": scmo,
+            "sccd": sccd,
+            }
+
+    def get_reserved_ids(self):
+        """
+        Sends a RESERVED_IDS_INFO command to the server.
+        Returns a dict with:
+        - (bool) status
+        - (list) of (int) ids -- currently reserved SCSI IDs
+        """
+        command = proto.PbCommand()
+        command.operation = proto.PbOperation.RESERVED_IDS_INFO
+        command.params["token"] = self.token
+        command.params["locale"] = self.locale
+
+        data = self.sock_cmd.send_pb_command(command.SerializeToString())
+        result = proto.PbResult()
+        result.ParseFromString(data)
+        scsi_ids = []
+        for scsi_id in result.reserved_ids_info.ids:
+            scsi_ids.append(str(scsi_id))
+
+        return {"status": result.status, "ids": scsi_ids}
+
+    def get_network_info(self):
+        """
+        Sends a NETWORK_INTERFACES_INFO command to the server.
+        Returns a dict with:
+        - (bool) status
+        - (list) of (str) ifs (network interfaces detected by RaSCSI)
+        """
+        command = proto.PbCommand()
+        command.operation = proto.PbOperation.NETWORK_INTERFACES_INFO
+        command.params["token"] = self.token
+        command.params["locale"] = self.locale
+
+        data = self.sock_cmd.send_pb_command(command.SerializeToString())
+        result = proto.PbResult()
+        result.ParseFromString(data)
+        ifs = result.network_interfaces_info.name
+        return {"status": result.status, "ifs": ifs}
+
+    def get_device_types(self):
+        """
+        Sends a DEVICE_TYPES_INFO command to the server.
+        Returns a dict with:
+        - (bool) status
+        - (list) of (str) device_types (device types that RaSCSI supports, ex. SCHD, SCCD, etc)
+        """
+        command = proto.PbCommand()
+        command.operation = proto.PbOperation.DEVICE_TYPES_INFO
+        command.params["token"] = self.token
+        command.params["locale"] = self.locale
+
+        data = self.sock_cmd.send_pb_command(command.SerializeToString())
+        result = proto.PbResult()
+        result.ParseFromString(data)
+        device_types = []
+        for prop in result.device_types_info.properties:
+            device_types.append(proto.PbDeviceType.Name(prop.type))
+        return {"status": result.status, "device_types": device_types}
+
+    def get_image_files_info(self):
+        """
+        Sends a DEFAULT_IMAGE_FILES_INFO command to the server.
+        Returns a dict with:
+        - (bool) status
+        - (str) images_dir, path to images dir
+        - (list) of (str) image_files
+        - (int) scan_depth, the current scan depth
+        """
+        command = proto.PbCommand()
+        command.operation = proto.PbOperation.DEFAULT_IMAGE_FILES_INFO
+        command.params["token"] = self.token
+        command.params["locale"] = self.token
+
+        data = self.sock_cmd.send_pb_command(command.SerializeToString())
+        result = proto.PbResult()
+        result.ParseFromString(data)
+        images_dir = result.image_files_info.default_image_folder
+        image_files = result.image_files_info.image_files
+        scan_depth = result.image_files_info.depth
+        return {
+            "status": result.status,
+            "images_dir": images_dir,
+            "image_files": image_files,
+            "scan_depth": scan_depth,
+            }
+
+    def attach_image(self, scsi_id, **kwargs):
+        """
+        Takes (int) scsi_id and kwargs containing 0 or more device properties
+
+        If the current attached device is a removable device wihout media inserted,
+        this sends a INJECT command to the server.
+        If there is no currently attached device, this sends the ATTACH command to the server.
+
+        Returns (bool) status and (str) msg
+
+        """
+        command = proto.PbCommand()
+        command.params["token"] = self.token
+        command.params["locale"] = self.locale
+        devices = proto.PbDeviceDefinition()
+        devices.id = int(scsi_id)
+
+        if "device_type" in kwargs.keys():
+            if kwargs["device_type"] not in [None, ""]:
+                devices.type = proto.PbDeviceType.Value(str(kwargs["device_type"]))
+        if "unit" in kwargs.keys():
+            if kwargs["unit"] not in [None, ""]:
+                devices.unit = kwargs["unit"]
+        if "image" in kwargs.keys():
+            if kwargs["image"] not in [None, ""]:
+                devices.params["file"] = kwargs["image"]
+
+        # Handling the inserting of media into an attached removable type device
+        device_type = kwargs.get("device_type", None)
+        currently_attached = self.list_devices(scsi_id, kwargs.get("unit"))["device_list"]
+        if currently_attached:
+            current_type = currently_attached[0]["device_type"]
+        else:
+            current_type = None
+
+        if device_type in REMOVABLE_DEVICE_TYPES and current_type in REMOVABLE_DEVICE_TYPES:
+            if current_type != device_type:
+                parameters = {
+                    "device_type": device_type,
+                    "current_device_type": current_type
+                }
+                return {
+                    "status": False,
+                    "return_code": ReturnCodes.ATTACHIMAGE_COULD_NOT_ATTACH,
+                    "parameters": parameters,
+                    }
+            command.operation = proto.PbOperation.INSERT
+        # Handling attaching a new device
+        else:
+            command.operation = proto.PbOperation.ATTACH
+            if "interfaces" in kwargs.keys():
+                if kwargs["interfaces"] not in [None, ""]:
+                    devices.params["interfaces"] = kwargs["interfaces"]
+            if "vendor" in kwargs.keys():
+                if kwargs["vendor"] is not None:
+                    devices.vendor = kwargs["vendor"]
+            if "product" in kwargs.keys():
+                if kwargs["product"] is not None:
+                    devices.product = kwargs["product"]
+            if "revision" in kwargs.keys():
+                if kwargs["revision"] is not None:
+                    devices.revision = kwargs["revision"]
+            if "block_size" in kwargs.keys():
+                if kwargs["block_size"] not in [None, ""]:
+                    devices.block_size = int(kwargs["block_size"])
+
+        command.devices.append(devices)
+
+        data = self.sock_cmd.send_pb_command(command.SerializeToString())
+        result = proto.PbResult()
+        result.ParseFromString(data)
+        return {"status": result.status, "msg": result.msg}
+
+    def detach_by_id(self, scsi_id, unit=None):
+        """
+        Takes (int) scsi_id and optional (int) unit.
+        Sends a DETACH command to the server.
+        Returns (bool) status and (str) msg.
+        """
+        devices = proto.PbDeviceDefinition()
+        devices.id = int(scsi_id)
+        if unit is not None:
+            devices.unit = int(unit)
+
+        command = proto.PbCommand()
+        command.operation = proto.PbOperation.DETACH
+        command.devices.append(devices)
+        command.params["token"] = self.token
+        command.params["locale"] = self.locale
+
+        data = self.sock_cmd.send_pb_command(command.SerializeToString())
+        result = proto.PbResult()
+        result.ParseFromString(data)
+        return {"status": result.status, "msg": result.msg}
+
+    def detach_all(self):
+        """
+        Sends a DETACH_ALL command to the server.
+        Returns (bool) status and (str) msg.
+        """
+        command = proto.PbCommand()
+        command.operation = proto.PbOperation.DETACH_ALL
+        command.params["token"] = self.token
+        command.params["locale"] = self.locale
+
+        data = self.sock_cmd.send_pb_command(command.SerializeToString())
+        result = proto.PbResult()
+        result.ParseFromString(data)
+        return {"status": result.status, "msg": result.msg}
+
+    def eject_by_id(self, scsi_id, unit=None):
+        """
+        Takes (int) scsi_id and optional (int) unit.
+        Sends an EJECT command to the server.
+        Returns (bool) status and (str) msg.
+        """
+        devices = proto.PbDeviceDefinition()
+        devices.id = int(scsi_id)
+        if unit is not None:
+            devices.unit = int(unit)
+
+        command = proto.PbCommand()
+        command.operation = proto.PbOperation.EJECT
+        command.devices.append(devices)
+        command.params["token"] = self.token
+        command.params["locale"] = self.locale
+
+        data = self.sock_cmd.send_pb_command(command.SerializeToString())
+        result = proto.PbResult()
+        result.ParseFromString(data)
+        return {"status": result.status, "msg": result.msg}
+
+    def list_devices(self, scsi_id=None, unit=None):
+        """
+        Takes optional (int) scsi_id and optional (int) unit.
+        Sends a DEVICES_INFO command to the server.
+        If no scsi_id is provided, returns a (list) of (dict)s of all attached devices.
+        If scsi_id is is provided, returns a (list) of one (dict) for the given device.
+        If no attached device is found, returns an empty (list).
+        Returns (bool) status, (list) of dicts device_list
+        """
+        command = proto.PbCommand()
+        command.operation = proto.PbOperation.DEVICES_INFO
+        command.params["token"] = self.token
+        command.params["locale"] = self.locale
+
+        # If method is called with scsi_id parameter, return the info on those devices
+        # Otherwise, return the info on all attached devices
+        if scsi_id is not None:
+            device = proto.PbDeviceDefinition()
+            device.id = int(scsi_id)
+            if unit is not None:
+                device.unit = int(unit)
+            command.devices.append(device)
+
+        data = self.sock_cmd.send_pb_command(command.SerializeToString())
+        result = proto.PbResult()
+        result.ParseFromString(data)
+
+        device_list = []
+
+        # Return an empty (list) if no devices are attached
+        if not result.devices_info.devices:
+            return {"status": False, "device_list": []}
+
+        image_files_info = self.get_image_files_info()
+        i = 0
+        while i < len(result.devices_info.devices):
+            did = result.devices_info.devices[i].id
+            dunit = result.devices_info.devices[i].unit
+            dtype = proto.PbDeviceType.Name(result.devices_info.devices[i].type)
+            dstat = result.devices_info.devices[i].status
+            dprop = result.devices_info.devices[i].properties
+
+            # Building the status string
+            dstat_msg = []
+            if dprop.read_only:
+                dstat_msg.append("Read-Only")
+            if dstat.protected and dprop.protectable:
+                dstat_msg.append("Write-Protected")
+            if dstat.removed and dprop.removable:
+                dstat_msg.append("No Media")
+            if dstat.locked and dprop.lockable:
+                dstat_msg.append("Locked")
+
+            dpath = result.devices_info.devices[i].file.name
+            dfile = dpath.replace(image_files_info["images_dir"] + "/", "")
+            dparam = result.devices_info.devices[i].params
+            dven = result.devices_info.devices[i].vendor
+            dprod = result.devices_info.devices[i].product
+            drev = result.devices_info.devices[i].revision
+            dblock = result.devices_info.devices[i].block_size
+            dsize = int(result.devices_info.devices[i].block_count) * int(dblock)
+
+            device_list.append({
+                "id": did,
+                "unit": dunit,
+                "device_type": dtype,
+                "status": ", ".join(dstat_msg),
+                "image": dpath,
+                "file": dfile,
+                "params": dparam,
+                "vendor": dven,
+                "product": dprod,
+                "revision": drev,
+                "block_size": dblock,
+                "size": dsize,
+                })
+            i += 1
+
+        return {"status": result.status, "msg": result.msg, "device_list": device_list}
+
+    def reserve_scsi_ids(self, reserved_scsi_ids):
+        """
+        Sends the RESERVE_IDS command to the server to reserve SCSI IDs.
+        Takes a (list) of (str) as argument.
+        """
+        command = proto.PbCommand()
+        command.operation = proto.PbOperation.RESERVE_IDS
+        command.params["ids"] = ",".join(reserved_scsi_ids)
+        command.params["token"] = self.token
+        command.params["locale"] = self.locale
+
+        data = self.sock_cmd.send_pb_command(command.SerializeToString())
+        result = proto.PbResult()
+        result.ParseFromString(data)
+        return {"status": result.status, "msg": result.msg}
+
+    def set_log_level(self, log_level):
+        """
+        Sends a LOG_LEVEL command to the server.
+        Takes (str) log_level as an argument.
+        Returns (bool) status and (str) msg.
+        """
+        command = proto.PbCommand()
+        command.operation = proto.PbOperation.LOG_LEVEL
+        command.params["level"] = str(log_level)
+        command.params["token"] = self.token
+        command.params["locale"] = self.locale
+
+        data = self.sock_cmd.send_pb_command(command.SerializeToString())
+        result = proto.PbResult()
+        result.ParseFromString(data)
+        return {"status": result.status, "msg": result.msg}
+
+    def shutdown_pi(self, mode):
+        """
+        Sends a SHUT_DOWN command to the server.
+        Takes (str) mode as an argument.
+        Returns (bool) status and (str) msg.
+        """
+        command = proto.PbCommand()
+        command.operation = proto.PbOperation.SHUT_DOWN
+        command.params["mode"] = str(mode)
+        command.params["token"] = self.token
+        command.params["locale"] = self.locale
+
+        data = self.sock_cmd.send_pb_command(command.SerializeToString())
+        result = proto.PbResult()
+        result.ParseFromString(data)
+        return {"status": result.status, "msg": result.msg}
+
+    def is_token_auth(self):
+        """
+        Sends a CHECK_AUTHENTICATION command to the server.
+        Tells you whether RaSCSI backend is protected by a token password or not.
+        Returns (bool) status and (str) msg.
+        """
+        command = proto.PbCommand()
+        command.operation = proto.PbOperation.CHECK_AUTHENTICATION
+
+        data = self.sock_cmd.send_pb_command(command.SerializeToString())
+        result = proto.PbResult()
+        result.ParseFromString(data)
+        return {"status": result.status, "msg": result.msg}
--- a/python/common/src/rascsi/return_codes.py
+++ b/python/common/src/rascsi/return_codes.py
@ -0,0 +1,25 @@
+"""
+Module for return codes that are refrenced in the return payloads of the rascsi module.
+"""
+from typing import Final
+
+
+# pylint: disable=too-few-public-methods
+class ReturnCodes:
+    """Class for the return codes used within the rascsi module."""
+    DELETEFILE_SUCCESS: Final = 0
+    DELETEFILE_FILE_NOT_FOUND: Final = 1
+    RENAMEFILE_SUCCESS: Final = 10
+    RENAMEFILE_UNABLE_TO_MOVE: Final = 11
+    DOWNLOADFILETOISO_SUCCESS: Final = 20
+    DOWNLOADTODIR_SUCCESS: Final = 30
+    WRITECONFIG_SUCCESS: Final = 40
+    WRITECONFIG_COULD_NOT_WRITE: Final = 41
+    READCONFIG_SUCCESS: Final = 50
+    READCONFIG_COULD_NOT_READ: Final = 51
+    READCONFIG_INVALID_CONFIG_FILE_FORMAT: Final = 51
+    WRITEDRIVEPROPS_SUCCESS: Final = 60
+    WRITEDRIVEPROPS_COULD_NOT_WRITE: Final = 61
+    READDRIVEPROPS_SUCCESS: Final = 70
+    READDRIVEPROPS_COULD_NOT_READ: Final = 71
+    ATTACHIMAGE_COULD_NOT_ATTACH: Final = 80
--- a/python/common/src/rascsi/socket_cmds.py
+++ b/python/common/src/rascsi/socket_cmds.py
@ -0,0 +1,91 @@
+"""
+Module for sending and receiving data over a socket connection with the RaSCSI backend
+"""
+
+import logging
+from time import sleep
+from rascsi.exceptions import (EmptySocketChunkException,
+                               InvalidProtobufResponse,
+                               FailedSocketConnectionException)
+
+
+class SocketCmds:
+    """
+    Class for sending and receiving data over a socket connection with the RaSCSI backend
+    """
+    def __init__(self, host="localhost", port=6868):
+        self.host = host
+        self.port = port
+
+    def send_pb_command(self, payload):
+        """
+        Takes a (str) containing a serialized protobuf as argument.
+        Establishes a socket connection with RaSCSI.
+        """
+
+        counter = 0
+        tries = 20
+        error_msg = ""
+
+        import socket
+        while counter < tries:
+            try:
+                with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as sock:
+                    sock.connect((self.host, self.port))
+                    response = self.send_over_socket(sock, payload)
+                return response
+            except socket.error as error:
+                counter += 1
+                logging.warning("The RaSCSI service is not responding - attempt %s/%s",
+                                str(counter), str(tries))
+                error_msg = str(error)
+                sleep(0.2)
+            except EmptySocketChunkException as ex:
+                raise ex
+            except InvalidProtobufResponse as ex:
+                raise ex
+
+        logging.error(error_msg)
+        raise FailedSocketConnectionException(error_msg)
+
+    # pylint: disable=no-self-use
+    def send_over_socket(self, sock, payload):
+        """
+        Takes a socket object and (str) payload with serialized protobuf.
+        Sends payload to RaSCSI over socket and captures the response.
+        Tries to extract and interpret the protobuf header to get response size.
+        Reads data from socket in 2048 bytes chunks until all data is received.
+        """
+        from struct import pack, unpack
+
+        # Sending the magic word "RASCSI" to authenticate with the server
+        sock.send(b"RASCSI")
+        # Prepending a little endian 32bit header with the message size
+        sock.send(pack("<i", len(payload)))
+        sock.send(payload)
+
+        # Receive the first 4 bytes to get the response header
+        response = sock.recv(4)
+        if len(response) >= 4:
+            # Extracting the response header to get the length of the response message
+            response_length = unpack("<i", response)[0]
+            # Reading in chunks, to handle a case where the response message is very large
+            chunks = []
+            bytes_recvd = 0
+            while bytes_recvd < response_length:
+                chunk = sock.recv(min(response_length - bytes_recvd, 2048))
+                if chunk == b'':
+                    error_message = ("Read an empty chunk from the socket. Socket connection has "
+                                     "dropped unexpectedly. RaSCSI may have crashed.")
+                    logging.error(error_message)
+                    raise EmptySocketChunkException(error_message)
+                chunks.append(chunk)
+                bytes_recvd = bytes_recvd + len(chunk)
+            response_message = b''.join(chunks)
+            return response_message
+
+        error_message = ("The response from RaSCSI did not contain a protobuf header. "
+                         "RaSCSI may have crashed.")
+
+        logging.error(error_message)
+        raise InvalidProtobufResponse(error_message)
--- a/python/oled/.pylintrc
+++ b/python/oled/.pylintrc
@ -1 +0,0 @@
-../.pylintrc
--- a/python/oled/README.md
+++ b/python/oled/README.md
@ -33,17 +33,6 @@ The start.sh script can also be run standalone, and will handle the venv creatio
 $ ./start.sh --rotation=180 --height=64
 ```

-## Static analysis with pylint
-
-It is recommended to run pylint against new code to protect against bugs
-and keep the code readable and maintainable.
-The local pylint configuration lives in .pylintrc (symlink to ../.pylintrc)
-
-```
-$ sudo apt install pylint3
-$ pylint3 python_source_file.py
-```
-
 ## Credits
 ### type_writer.ttf
 * _Type Writer_ TrueType font by Mandy Smith
--- a/python/oled/src/init.py
+++ b/python/oled/src/init.py
--- a/python/oled/src/interrupt_handler.py
+++ b/python/oled/src/interrupt_handler.py
@ -3,7 +3,8 @@ Linux interrupt handling module
 """
 import signal

-class GracefulInterruptHandler():
+
+class GracefulInterruptHandler:
    """
    Class for handling Linux signal interrupts
    """
--- a/python/oled/src/pi_cmds.py
+++ b/python/oled/src/pi_cmds.py
@ -2,6 +2,7 @@
 Module with methods that interact with the Pi's Linux system
 """

+
 def get_ip_and_host():
    """
    Use a mock socket connection to identify the Pi's hostname and IP address
--- a/python/oled/src/ractl_cmds.py
+++ b/python/oled/src/ractl_cmds.py
@ -1,70 +0,0 @@
-"""
-Module for commands sent to the RaSCSI backend service.
-"""
-from os import path
-from unidecode import unidecode
-from socket_cmds import send_pb_command
-import rascsi_interface_pb2 as proto
-
-def device_list(token):
-    """
-    Sends a DEVICES_INFO command to the server.
-    Returns a list of dicts with info on all attached devices.
-    """
-    command = proto.PbCommand()
-    command.operation = proto.PbOperation.DEVICES_INFO
-    command.params["token"] = token
-    data = send_pb_command(command.SerializeToString())
-    result = proto.PbResult()
-    result.ParseFromString(data)
-
-    dlist = []
-    i = 0
-
-    while i < len(result.devices_info.devices):
-        did = result.devices_info.devices[i].id
-        dtype = proto.PbDeviceType.Name(result.devices_info.devices[i].type)
-        dstat = result.devices_info.devices[i].status
-        dprop = result.devices_info.devices[i].properties
-
-        # Building the status string
-        dstat_msg = []
-        if dstat.protected and dprop.protectable:
-            dstat_msg.append("Write-Protected")
-        if dstat.removed and dprop.removable:
-            dstat_msg.append("No Media")
-        if dstat.locked and dprop.lockable:
-            dstat_msg.append("Locked")
-
-        # Transliterate non-ASCII chars in the file name to ASCII
-        dfile = unidecode(path.basename(result.devices_info.devices[i].file.name))
-        dven = result.devices_info.devices[i].vendor
-        dprod = result.devices_info.devices[i].product
-
-        dlist.append({
-            "id": did,
-            "device_type": dtype,
-            "status": ", ".join(dstat_msg),
-            "file": dfile,
-            "vendor": dven,
-            "product": dprod,
-            })
-        i += 1
-
-    return dlist
-
-
-def is_token_auth(token):
-    """
-    Sends a CHECK_AUTHENTICATION command to the server.
-    Tells you whether RaSCSI backend is protected by a token password or not.
-    Returns (bool) status and (str) msg.
-    """
-    command = proto.PbCommand()
-    command.operation = proto.PbOperation.CHECK_AUTHENTICATION
-    command.params["token"] = token
-
-    data = send_pb_command(command.SerializeToString())
-    result = proto.PbResult()
-    result.ParseFromString(data)
-    return {"status": result.status, "msg": result.msg}
--- a/python/oled/src/rascsi_oled_monitor.py
+++ b/python/oled/src/rascsi_oled_monitor.py
@ -30,6 +30,7 @@
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 """
+
 import argparse
 import sys
 from time import sleep
@ -39,7 +40,8 @@ from adafruit_ssd1306 import SSD1306_I2C
 from PIL import Image, ImageDraw, ImageFont
 from interrupt_handler import GracefulInterruptHandler
 from pi_cmds import get_ip_and_host
-from ractl_cmds import device_list, is_token_auth
+from rascsi.ractl_cmds import RaCtlCmds
+from rascsi.socket_cmds import SocketCmds

 parser = argparse.ArgumentParser(description="RaSCSI OLED Monitor script")
 parser.add_argument(
@ -65,6 +67,20 @@ parser.add_argument(
    action="store",
    help="Token password string for authenticating with RaSCSI",
    )
+parser.add_argument(
+    "--rascsi-host",
+    type=str,
+    default="localhost",
+    action="store",
+    help="RaSCSI host. Default: localhost",
+)
+parser.add_argument(
+    "--rascsi-port",
+    type=str,
+    default=6868,
+    action="store",
+    help="RaSCSI port. Default: 6868",
+)
 args = parser.parse_args()

 if args.rotation == 0:
@ -81,6 +97,9 @@ elif args.height == 32:

 TOKEN = args.password

+sock_cmd = SocketCmds(host=args.rascsi_host, port=args.rascsi_port)
+ractl_cmd = RaCtlCmds(sock_cmd=sock_cmd, token=TOKEN)
+
 WIDTH = 128
 BORDER = 5

@ -148,10 +167,10 @@ def formatted_output():
    Formats the strings to be displayed on the Screen
    Returns a (list) of (str) output
    """
-    rascsi_list = device_list(TOKEN)
+    rascsi_list = ractl_cmd.list_devices()['device_list']
    output = []

-    if not TOKEN and not is_token_auth(TOKEN)["status"]:
+    if not TOKEN and not ractl_cmd.is_token_auth()["status"]:
        output.append("Permission denied!")
    elif rascsi_list:
        for line in rascsi_list:
--- a/python/oled/src/socket_cmds.py
+++ b/python/oled/src/socket_cmds.py
@ -1,73 +0,0 @@
-"""
-Module for handling socket connections for sending commands
-and receiving results from the RaSCSI backend
-"""
-
-import socket
-from struct import pack, unpack
-from time import sleep
-
-def send_pb_command(payload):
-    """
-    Takes a (str) containing a serialized protobuf as argument.
-    Establishes a socket connection with RaSCSI.
-    """
-    # Host and port number where rascsi is listening for socket connections
-    host = 'localhost'
-    port = 6868
-
-    counter = 0
-    tries = 20
-    error_msg = ""
-
-    while counter < tries:
-        try:
-            with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as sock:
-                sock.connect((host, port))
-                return send_over_socket(sock, payload)
-        except socket.error as error:
-            counter += 1
-            print("The RaSCSI service is not responding - attempt %s/%s",
-                  str(counter), str(tries))
-            error_msg = str(error)
-            sleep(0.2)
-
-    exit(error_msg)
-
-
-def send_over_socket(sock, payload):
-    """
-    Takes a socket object and (str) payload with serialized protobuf.
-    Sends payload to RaSCSI over socket and captures the response.
-    Tries to extract and interpret the protobuf header to get response size.
-    Reads data from socket in 2048 bytes chunks until all data is received.
-    """
-
-    # Sending the magic word "RASCSI" to authenticate with the server
-    sock.send(b"RASCSI")
-    # Prepending a little endian 32bit header with the message size
-    sock.send(pack("<i", len(payload)))
-    sock.send(payload)
-
-    # Receive the first 4 bytes to get the response header
-    response = sock.recv(4)
-    if len(response) >= 4:
-        # Extracting the response header to get the length of the response message
-        response_length = unpack("<i", response)[0]
-        # Reading in chunks, to handle a case where the response message is very large
-        chunks = []
-        bytes_recvd = 0
-        while bytes_recvd < response_length:
-            chunk = sock.recv(min(response_length - bytes_recvd, 2048))
-            if chunk == b'':
-                exit("Socket connection has dropped unexpectedly. "
-                     "RaSCSI may have crashed."
-                    )
-            chunks.append(chunk)
-            bytes_recvd = bytes_recvd + len(chunk)
-        response_message = b''.join(chunks)
-        return response_message
-
-    exit("The response from RaSCSI did not contain a protobuf header. "
-         "RaSCSI may have crashed."
-        )
--- a/python/oled/start.sh
+++ b/python/oled/start.sh
@ -149,4 +149,7 @@ if [ -z ${HEIGHT+x} ]; then
 else
    echo "Starting with parameter $HEIGHT"
 fi
+
+PYTHON_COMMON_PATH=$(dirname $PWD)/common/src
+export PYTHONPATH=$PWD/src:${PYTHON_COMMON_PATH}
 python3 src/rascsi_oled_monitor.py ${ROTATION} ${HEIGHT} ${PASSWORD}
--- a/python/web/.pylintrc
+++ b/python/web/.pylintrc
@ -1 +0,0 @@
-../.pylintrc
--- a/python/web/README.md
+++ b/python/web/README.md
@ -19,20 +19,6 @@ You may edit the files under `mock/bin` to simulate Linux command responses.
 TODO:  rascsi-web uses protobuf commands to send and receive data from rascsi.
 A separate mocking solution will be needed for this interface.

-### Static analysis with pylint
-
-It is recommended to run pylint against new code to protect against bugs
-and keep the code readable and maintainable.
-The local pylint configuration lives in .pylintrc
-In order for pylint to recognize venv libraries, the pylint-venv package is required.
-
-```
-sudo apt install pylint3
-sudo pip install pylint-venv
-source venv/bin/activate
-pylint3 python_source_file.py
-```
-
 ## Pushing to the Pi via git

 Setup a bare repo on the rascsi
--- a/python/web/init.py
+++ b/python/web/init.py
--- a/python/web/src/init.py
+++ b/python/web/src/init.py
--- a/python/web/src/device_utils.py
+++ b/python/web/src/device_utils.py
@ -2,6 +2,7 @@
 Module for RaSCSI device management utility methods
 """

+
 def get_valid_scsi_ids(devices, reserved_ids):
    """
    Takes a list of (dict)s devices, and list of (int)s reserved_ids.
--- a/python/web/src/file_cmds.py
+++ b/python/web/src/file_cmds.py
@ -1,538 +0,0 @@
-"""
-Module for methods reading from and writing to the file system
-"""
-
-import os
-import logging
-from pathlib import PurePath
-from flask import current_app, session
-from flask_babel import _
-
-from ractl_cmds import (
-    get_server_info,
-    get_reserved_ids,
-    attach_image,
-    detach_all,
-    list_devices,
-    reserve_scsi_ids,
-)
-from pi_cmds import run_async
-from socket_cmds import send_pb_command
-from settings import CFG_DIR, CONFIG_FILE_SUFFIX, PROPERTIES_SUFFIX, RESERVATIONS
-import rascsi_interface_pb2 as proto
-
-
-def list_files(file_types, dir_path):
-    """
-    Takes a (list) or (tuple) of (str) file_types - e.g. ('hda', 'hds')
-    Returns (list) of (list)s files_list:
-    index 0 is (str) file name and index 1 is (int) size in bytes
-    """
-    files_list = []
-    for path, dirs, files in os.walk(dir_path):
-        # Only list selected file types
-        files = [f for f in files if f.lower().endswith(file_types)]
-        files_list.extend(
-            [
-                (
-                    file,
-                    os.path.getsize(os.path.join(path, file))
-                )
-                for file in files
-            ]
-        )
-    return files_list
-
-
-def list_config_files():
-    """
-    Finds fils with file ending CONFIG_FILE_SUFFIX in CFG_DIR.
-    Returns a (list) of (str) files_list
-    """
-    files_list = []
-    for root, dirs, files in os.walk(CFG_DIR):
-        for file in files:
-            if file.endswith("." + CONFIG_FILE_SUFFIX):
-                files_list.append(file)
-    return files_list
-
-
-def list_images():
-    """
-    Sends a IMAGE_FILES_INFO command to the server
-    Returns a (dict) with (bool) status, (str) msg, and (list) of (dict)s files
-
-    """
-    command = proto.PbCommand()
-    command.operation = proto.PbOperation.DEFAULT_IMAGE_FILES_INFO
-    command.params["token"] = current_app.config["TOKEN"]
-    if "language" in session.keys():
-        command.params["locale"] = session["language"]
-
-    data = send_pb_command(command.SerializeToString())
-    result = proto.PbResult()
-    result.ParseFromString(data)
-
-    # Get a list of all *.properties files in CFG_DIR
-    prop_data = list_files(PROPERTIES_SUFFIX, CFG_DIR)
-    prop_files = [PurePath(x[0]).stem for x in prop_data]
-
-    from zipfile import ZipFile, is_zipfile
-    server_info = get_server_info()
-    files = []
-    for file in result.image_files_info.image_files:
-        # Add properties meta data for the image, if applicable
-        if file.name in prop_files:
-            process = read_drive_properties(f"{CFG_DIR}/{file.name}.{PROPERTIES_SUFFIX}")
-            prop = process["conf"]
-        else:
-            prop = False
-        if file.name.lower().endswith(".zip"):
-            zip_path = f"{server_info['image_dir']}/{file.name}"
-            if is_zipfile(zip_path):
-                zipfile = ZipFile(zip_path)
-                # Get a list of (str) containing all zipfile members
-                zip_members = zipfile.namelist()
-                # Strip out directories from the list
-                zip_members = [x for x in zip_members if not x.endswith("/")]
-            else:
-                logging.warning("%s is an invalid zip file", zip_path)
-                zip_members = False
-        else:
-            zip_members = False
-
-        size_mb = "{:,.1f}".format(file.size / 1024 / 1024)
-        dtype = proto.PbDeviceType.Name(file.type)
-        files.append({
-            "name": file.name,
-            "size": file.size,
-            "size_mb": size_mb,
-            "detected_type": dtype,
-            "prop": prop,
-            "zip_members": zip_members,
-            })
-
-    return {"status": result.status, "msg": result.msg, "files": files}
-
-
-def create_new_image(file_name, file_type, size):
-    """
-    Takes (str) file_name, (str) file_type, and (int) size
-    Sends a CREATE_IMAGE command to the server
-    Returns (dict) with (bool) status and (str) msg
-    """
-    command = proto.PbCommand()
-    command.operation = proto.PbOperation.CREATE_IMAGE
-    command.params["token"] = current_app.config["TOKEN"]
-    if "language" in session.keys():
-        command.params["locale"] = session["language"]
-
-    command.params["file"] = file_name + "." + file_type
-    command.params["size"] = str(size)
-    command.params["read_only"] = "false"
-
-    data = send_pb_command(command.SerializeToString())
-    result = proto.PbResult()
-    result.ParseFromString(data)
-    return {"status": result.status, "msg": result.msg}
-
-
-def delete_image(file_name):
-    """
-    Takes (str) file_name
-    Sends a DELETE_IMAGE command to the server
-    Returns (dict) with (bool) status and (str) msg
-    """
-    command = proto.PbCommand()
-    command.operation = proto.PbOperation.DELETE_IMAGE
-    command.params["token"] = current_app.config["TOKEN"]
-    if "language" in session.keys():
-        command.params["locale"] = session["language"]
-
-    command.params["file"] = file_name
-
-    data = send_pb_command(command.SerializeToString())
-    result = proto.PbResult()
-    result.ParseFromString(data)
-    return {"status": result.status, "msg": result.msg}
-
-
-def rename_image(file_name, new_file_name):
-    """
-    Takes (str) file_name, (str) new_file_name
-    Sends a RENAME_IMAGE command to the server
-    Returns (dict) with (bool) status and (str) msg
-    """
-    command = proto.PbCommand()
-    command.operation = proto.PbOperation.RENAME_IMAGE
-    command.params["token"] = current_app.config["TOKEN"]
-    if "language" in session.keys():
-        command.params["locale"] = session["language"]
-
-    command.params["from"] = file_name
-    command.params["to"] = new_file_name
-
-    data = send_pb_command(command.SerializeToString())
-    result = proto.PbResult()
-    result.ParseFromString(data)
-    return {"status": result.status, "msg": result.msg}
-
-
-def delete_file(file_path):
-    """
-    Takes (str) file_path with the full path to the file to delete
-    Returns (dict) with (bool) status and (str) msg
-    """
-    if os.path.exists(file_path):
-        os.remove(file_path)
-        return {
-                "status": True,
-                "msg": _(u"File deleted: %(file_path)s", file_path=file_path),
-            }
-    return {
-            "status": False,
-            "msg": _(u"File to delete not found: %(file_path)s", file_path=file_path),
-        }
-
-
-def rename_file(file_path, target_path):
-    """
-    Takes (str) file_path and (str) target_path
-    Returns (dict) with (bool) status and (str) msg
-    """
-    if os.path.exists(PurePath(target_path).parent):
-        os.rename(file_path, target_path)
-        return {
-            "status": True,
-            "msg": _(u"File moved to: %(target_path)s", target_path=target_path),
-            }
-    return {
-        "status": False,
-        "msg": _(u"Unable to move file to: %(target_path)s", target_path=target_path),
-        }
-
-
-def unzip_file(file_name, member=False, members=False):
-    """
-    Takes (str) file_name, optional (str) member, optional (list) of (str) members
-    file_name is the name of the zip file to unzip
-    member is the full path to the particular file in the zip file to unzip
-    members contains all of the full paths to each of the zip archive members
-    Returns (dict) with (boolean) status and (list of str) msg
-    """
-    from asyncio import run
-    server_info = get_server_info()
-    prop_flag = False
-
-    if not member:
-        unzip_proc = run(run_async(
-            f"unzip -d {server_info['image_dir']} -n -j "
-            f"{server_info['image_dir']}/{file_name}"
-            ))
-        if members:
-            for path in members:
-                if path.endswith(PROPERTIES_SUFFIX):
-                    name = PurePath(path).name
-                    rename_file(f"{server_info['image_dir']}/{name}", f"{CFG_DIR}/{name}")
-                    prop_flag = True
-    else:
-        from re import escape
-        member = escape(member)
-        unzip_proc = run(run_async(
-            f"unzip -d {server_info['image_dir']} -n -j "
-            f"{server_info['image_dir']}/{file_name} {member}"
-            ))
-        # Attempt to unzip a properties file in the same archive dir
-        unzip_prop = run(run_async(
-            f"unzip -d {CFG_DIR} -n -j "
-            f"{server_info['image_dir']}/{file_name} {member}.{PROPERTIES_SUFFIX}"
-            ))
-        if unzip_prop["returncode"] == 0:
-            prop_flag = True
-    if unzip_proc["returncode"] != 0:
-        logging.warning("Unzipping failed: %s", unzip_proc["stderr"])
-        return {"status": False, "msg": unzip_proc["stderr"]}
-
-    from re import findall
-    unzipped = findall(
-        "(?:inflating|extracting):(.+)\n",
-        unzip_proc["stdout"]
-        )
-    return {"status": True, "msg": unzipped, "prop_flag": prop_flag}
-
-
-def download_file_to_iso(url, *iso_args):
-    """
-    Takes (str) url and one or more (str) *iso_args
-    Returns (dict) with (bool) status and (str) msg
-    """
-    from time import time
-    from subprocess import run, CalledProcessError
-    import asyncio
-
-    server_info = get_server_info()
-
-    file_name = PurePath(url).name
-    tmp_ts = int(time())
-    tmp_dir = "/tmp/" + str(tmp_ts) + "/"
-    os.mkdir(tmp_dir)
-    tmp_full_path = tmp_dir + file_name
-    iso_filename = f"{server_info['image_dir']}/{file_name}.iso"
-
-    req_proc = download_to_dir(url, tmp_dir, file_name)
-
-    if not req_proc["status"]:
-        return {"status": False, "msg": req_proc["msg"]}
-
-    from zipfile import is_zipfile, ZipFile
-    if is_zipfile(tmp_full_path):
-        if "XtraStuf.mac" in str(ZipFile(tmp_full_path).namelist()):
-            logging.info("MacZip file format detected. Will not unzip to retain resource fork.")
-        else:
-            logging.info(
-                "%s is a zipfile! Will attempt to unzip and store the resulting files.",
-                tmp_full_path,
-                )
-            unzip_proc = asyncio.run(run_async(
-                f"unzip -d {tmp_dir} -n {tmp_full_path}"
-                ))
-            if not unzip_proc["returncode"]:
-                logging.info(
-                    "%s was successfully unzipped. Deleting the zipfile.",
-                    tmp_full_path,
-                    )
-                delete_file(tmp_full_path)
-
-    try:
-        run(
-            [
-                "genisoimage",
-                *iso_args,
-                "-o",
-                iso_filename,
-                tmp_dir,
-            ],
-            capture_output=True,
-            check=True,
-        )
-    except CalledProcessError as error:
-        logging.warning("Executed shell command: %s", " ".join(error.cmd))
-        logging.warning("Got error: %s", error.stderr.decode("utf-8"))
-        return {"status": False, "msg": error.stderr.decode("utf-8")}
-
-    return {
-        "status": True,
-        "msg": _(
-            u"Created CD-ROM ISO image with arguments \"%(value)s\"",
-            value=" ".join(iso_args),
-            ),
-        "file_name": iso_filename,
-    }
-
-
-def download_to_dir(url, save_dir, file_name):
-    """
-    Takes (str) url, (str) save_dir, (str) file_name
-    Returns (dict) with (bool) status and (str) msg
-    """
-    import requests
-    logging.info("Making a request to download %s", url)
-
-    try:
-        with requests.get(url, stream=True, headers={"User-Agent": "Mozilla/5.0"}) as req:
-            req.raise_for_status()
-            with open(f"{save_dir}/{file_name}", "wb") as download:
-                for chunk in req.iter_content(chunk_size=8192):
-                    download.write(chunk)
-    except requests.exceptions.RequestException as error:
-        logging.warning("Request failed: %s", str(error))
-        return {"status": False, "msg": str(error)}
-
-    logging.info("Response encoding: %s", req.encoding)
-    logging.info("Response content-type: %s", req.headers["content-type"])
-    logging.info("Response status code: %s", req.status_code)
-
-    return {
-        "status": True,
-        "msg": _(
-            u"%(file_name)s downloaded to %(save_dir)s",
-            file_name=file_name,
-            save_dir=save_dir,
-            ),
-        }
-
-
-def write_config(file_name):
-    """
-    Takes (str) file_name
-    Returns (dict) with (bool) status and (str) msg
-    """
-    from json import dump
-    file_name = f"{CFG_DIR}/{file_name}"
-    try:
-        with open(file_name, "w") as json_file:
-            version = get_server_info()["version"]
-            devices = list_devices()["device_list"]
-            for device in devices:
-                # Remove keys that we don't want to store in the file
-                del device["status"]
-                del device["file"]
-                # It's cleaner not to store an empty parameter for every device without media
-                if device["image"] == "":
-                    device["image"] = None
-                # RaSCSI product names will be generated on the fly by RaSCSI
-                if device["vendor"] == "RaSCSI":
-                    device["vendor"] = device["product"] = device["revision"] = None
-                # A block size of 0 is how RaSCSI indicates N/A for block size
-                if device["block_size"] == 0:
-                    device["block_size"] = None
-                # Convert to a data type that can be serialized
-                device["params"] = dict(device["params"])
-            reserved_ids_and_memos = []
-            reserved_ids = get_reserved_ids()["ids"]
-            for scsi_id in reserved_ids:
-                reserved_ids_and_memos.append({"id": scsi_id, "memo": RESERVATIONS[int(scsi_id)]})
-            dump(
-                {"version": version, "devices": devices, "reserved_ids": reserved_ids_and_memos},
-                json_file,
-                indent=4
-                )
-        return {
-            "status": True,
-            "msg": _(u"Saved configuration file to %(file_name)s", file_name=file_name),
-            }
-    except (IOError, ValueError, EOFError, TypeError) as error:
-        logging.error(str(error))
-        delete_file(file_name)
-        return {"status": False, "msg": str(error)}
-    except:
-        logging.error("Could not write to file: %s", file_name)
-        delete_file(file_name)
-        return {
-            "status": False,
-            "msg": _(u"Could not write to file: %(file_name)s", file_name=file_name),
-            }
-
-
-def read_config(file_name):
-    """
-    Takes (str) file_name
-    Returns (dict) with (bool) status and (str) msg
-    """
-    from json import load
-    file_name = f"{CFG_DIR}/{file_name}"
-    try:
-        with open(file_name) as json_file:
-            config = load(json_file)
-            # If the config file format changes again in the future,
-            # introduce more sophisticated format detection logic here.
-            if isinstance(config, dict):
-                detach_all()
-                ids_to_reserve = []
-                for item in config["reserved_ids"]:
-                    ids_to_reserve.append(item["id"])
-                    RESERVATIONS[int(item["id"])] = item["memo"]
-                reserve_scsi_ids(ids_to_reserve)
-                for row in config["devices"]:
-                    kwargs = {
-                        "device_type": row["device_type"],
-                        "image": row["image"],
-                        "unit": int(row["unit"]),
-                        "vendor": row["vendor"],
-                        "product": row["product"],
-                        "revision": row["revision"],
-                        "block_size": row["block_size"],
-                        }
-                    params = dict(row["params"])
-                    for param in params.keys():
-                        kwargs[param] = params[param]
-                    attach_image(row["id"], **kwargs)
-            # The config file format in RaSCSI 21.10 is using a list data type at the top level.
-            # If future config file formats return to the list data type,
-            # introduce more sophisticated format detection logic here.
-            elif isinstance(config, list):
-                detach_all()
-                for row in config:
-                    kwargs = {
-                        "device_type": row["device_type"],
-                        "image": row["image"],
-                        # "un" for backwards compatibility
-                        "unit": int(row["un"]),
-                        "vendor": row["vendor"],
-                        "product": row["product"],
-                        "revision": row["revision"],
-                        "block_size": row["block_size"],
-                        }
-                    params = dict(row["params"])
-                    for param in params.keys():
-                        kwargs[param] = params[param]
-                    attach_image(row["id"], **kwargs)
-            else:
-                return {"status": False, "msg": _(u"Invalid configuration file format")}
-            return {
-                "status": True,
-                "msg": _(u"Loaded configurations from: %(file_name)s", file_name=file_name),
-                }
-    except (IOError, ValueError, EOFError, TypeError) as error:
-        logging.error(str(error))
-        return {"status": False, "msg": str(error)}
-    except:
-        logging.error("Could not read file: %s", file_name)
-        return {
-            "status": False,
-            "msg": _(u"Could not read configuration file: %(file_name)s", file_name=file_name),
-            }
-
-
-def write_drive_properties(file_name, conf):
-    """
-    Writes a drive property configuration file to the config dir.
-    Takes file name base (str) and (list of dicts) conf as arguments
-    Returns (dict) with (bool) status and (str) msg
-    """
-    from json import dump
-    file_path = f"{CFG_DIR}/{file_name}"
-    try:
-        with open(file_path, "w") as json_file:
-            dump(conf, json_file, indent=4)
-        return {
-            "status": True,
-            "msg": _(u"Created properties file: %(file_path)s", file_path=file_path),
-            }
-    except (IOError, ValueError, EOFError, TypeError) as error:
-        logging.error(str(error))
-        delete_file(file_path)
-        return {"status": False, "msg": str(error)}
-    except:
-        logging.error("Could not write to file: %s", file_path)
-        delete_file(file_path)
-        return {
-            "status": False,
-            "msg": _(u"Could not write to properties file: %(file_path)s", file_path=file_path),
-            }
-
-
-def read_drive_properties(file_path):
-    """
-    Reads drive properties from json formatted file.
-    Takes (str) file_path as argument.
-    Returns (dict) with (bool) status, (str) msg, (dict) conf
-    """
-    from json import load
-    try:
-        with open(file_path) as json_file:
-            conf = load(json_file)
-            return {
-                "status": True,
-                "msg": _(u"Read properties from file: %(file_path)s", file_path=file_path),
-                "conf": conf,
-                }
-    except (IOError, ValueError, EOFError, TypeError) as error:
-        logging.error(str(error))
-        return {"status": False, "msg": str(error)}
-    except:
-        logging.error("Could not read file: %s", file_path)
-        return {
-            "status": False,
-            "msg": _(u"Could not read properties from file: %(file_path)s", file_path=file_path),
-            }
--- a/python/web/src/pi_cmds.py
+++ b/python/web/src/pi_cmds.py
@ -3,7 +3,6 @@ Module for methods controlling and getting information about the Pi's Linux syst
 """

 import subprocess
-import asyncio
 import logging
 from flask_babel import _
 from settings import AUTH_GROUP
@ -132,7 +131,7 @@ def introspect_file(file_path, re_term):
    """
    from re import match
    try:
-        ifile = open(file_path, "r")
+        ifile = open(file_path, "r", encoding="ISO-8859-1")
    except:
        return False
    for line in ifile:
@ -141,30 +140,6 @@ def introspect_file(file_path, re_term):
    return False


-async def run_async(cmd):
-    """
-    Takes (str) cmd with the shell command to execute
-    Executes shell command and captures output
-    Returns (dict) with (int) returncode, (str) stdout, (str) stderr
-    """
-    proc = await asyncio.create_subprocess_shell(
-        cmd,
-        stdout=asyncio.subprocess.PIPE,
-        stderr=asyncio.subprocess.PIPE)
-
-    stdout, stderr = await proc.communicate()
-
-    logging.info("Executed command \"%s\" with status code %d", cmd, proc.returncode)
-    if stdout:
-        stdout = stdout.decode()
-        logging.info("stdout: %s", stdout)
-    if stderr:
-        stderr = stderr.decode()
-        logging.info("stderr: %s", stderr)
-
-    return {"returncode": proc.returncode, "stdout": stdout, "stderr": stderr}
-
-
 def auth_active():
    """
    Inspects if the group defined in AUTH_GROUP exists on the system.
@ -176,6 +151,6 @@ def auth_active():
    if AUTH_GROUP in groups:
        return {
                "status": True,
-                "msg": _(u"You must log in to use this function"),
+                "msg": _("You must log in to use this function"),
                }
    return {"status": False, "msg": ""}
--- a/python/web/src/ractl_cmds.py
+++ b/python/web/src/ractl_cmds.py
@ -1,465 +0,0 @@
-"""
-Module for commands sent to the RaSCSI backend service.
-"""
-
-from flask import current_app, session
-from flask_babel import _
-import rascsi_interface_pb2 as proto
-from settings import REMOVABLE_DEVICE_TYPES
-from socket_cmds import send_pb_command
-
-
-def get_server_info():
-    """
-    Sends a SERVER_INFO command to the server.
-    Returns a dict with:
-    - (bool) status
-    - (str) version (RaSCSI version number)
-    - (list) of (str) log_levels (the log levels RaSCSI supports)
-    - (str) current_log_level
-    - (list) of (int) reserved_ids
-    - (str) image_dir, path to the default images directory
-    - (int) scan_depth, the current images directory scan depth
-    - 5 distinct (list)s of (str)s with file endings recognized by RaSCSI
-    """
-    command = proto.PbCommand()
-    command.operation = proto.PbOperation.SERVER_INFO
-    command.params["token"] = current_app.config["TOKEN"]
-    if "language" in session.keys():
-        command.params["locale"] = session["language"]
-
-    data = send_pb_command(command.SerializeToString())
-    result = proto.PbResult()
-    result.ParseFromString(data)
-    version = str(result.server_info.version_info.major_version) + "." +\
-              str(result.server_info.version_info.minor_version) + "." +\
-              str(result.server_info.version_info.patch_version)
-    log_levels = result.server_info.log_level_info.log_levels
-    current_log_level = result.server_info.log_level_info.current_log_level
-    reserved_ids = list(result.server_info.reserved_ids_info.ids)
-    image_dir = result.server_info.image_files_info.default_image_folder
-    scan_depth = result.server_info.image_files_info.depth
-
-    # Creates lists of file endings recognized by RaSCSI
-    mappings = result.server_info.mapping_info.mapping
-    sahd = []
-    schd = []
-    scrm = []
-    scmo = []
-    sccd = []
-    for dtype in mappings:
-        if mappings[dtype] == proto.PbDeviceType.SAHD:
-            sahd.append(dtype)
-        elif mappings[dtype] == proto.PbDeviceType.SCHD:
-            schd.append(dtype)
-        elif mappings[dtype] == proto.PbDeviceType.SCRM:
-            scrm.append(dtype)
-        elif mappings[dtype] == proto.PbDeviceType.SCMO:
-            scmo.append(dtype)
-        elif mappings[dtype] == proto.PbDeviceType.SCCD:
-            sccd.append(dtype)
-
-    return {
-        "status": result.status,
-        "version": version,
-        "log_levels": log_levels,
-        "current_log_level": current_log_level,
-        "reserved_ids": reserved_ids,
-        "image_dir": image_dir,
-        "scan_depth": scan_depth,
-        "sahd": sahd,
-        "schd": schd,
-        "scrm": scrm,
-        "scmo": scmo,
-        "sccd": sccd,
-        }
-
-
-def get_reserved_ids():
-    """
-    Sends a RESERVED_IDS_INFO command to the server.
-    Returns a dict with:
-    - (bool) status
-    - (list) of (int) ids -- currently reserved SCSI IDs
-    """
-    command = proto.PbCommand()
-    command.operation = proto.PbOperation.RESERVED_IDS_INFO
-    command.params["token"] = current_app.config["TOKEN"]
-    if "language" in session.keys():
-        command.params["locale"] = session["language"]
-
-    data = send_pb_command(command.SerializeToString())
-    result = proto.PbResult()
-    result.ParseFromString(data)
-    scsi_ids = []
-    for scsi_id in result.reserved_ids_info.ids:
-        scsi_ids.append(str(scsi_id))
-
-    return {"status": result.status, "ids": scsi_ids}
-
-
-def get_network_info():
-    """
-    Sends a NETWORK_INTERFACES_INFO command to the server.
-    Returns a dict with:
-    - (bool) status
-    - (list) of (str) ifs (network interfaces detected by RaSCSI)
-    """
-    command = proto.PbCommand()
-    command.operation = proto.PbOperation.NETWORK_INTERFACES_INFO
-    command.params["token"] = current_app.config["TOKEN"]
-    if "language" in session.keys():
-        command.params["locale"] = session["language"]
-
-    data = send_pb_command(command.SerializeToString())
-    result = proto.PbResult()
-    result.ParseFromString(data)
-    ifs = result.network_interfaces_info.name
-    return {"status": result.status, "ifs": ifs}
-
-
-def get_device_types():
-    """
-    Sends a DEVICE_TYPES_INFO command to the server.
-    Returns a dict with:
-    - (bool) status
-    - (list) of (str) device_types (device types that RaSCSI supports, ex. SCHD, SCCD, etc)
-    """
-    command = proto.PbCommand()
-    command.operation = proto.PbOperation.DEVICE_TYPES_INFO
-    command.params["token"] = current_app.config["TOKEN"]
-    if "language" in session.keys():
-        command.params["locale"] = session["language"]
-
-    data = send_pb_command(command.SerializeToString())
-    result = proto.PbResult()
-    result.ParseFromString(data)
-    device_types = []
-    for prop in result.device_types_info.properties:
-        device_types.append(proto.PbDeviceType.Name(prop.type))
-    return {"status": result.status, "device_types": device_types}
-
-
-def get_image_files_info():
-    """
-    Sends a DEFAULT_IMAGE_FILES_INFO command to the server.
-    Returns a dict with:
-    - (bool) status
-    - (str) images_dir, path to images dir
-    - (list) of (str) image_files
-    - (int) scan_depth, the current scan depth
-    """
-    command = proto.PbCommand()
-    command.operation = proto.PbOperation.DEFAULT_IMAGE_FILES_INFO
-    command.params["token"] = current_app.config["TOKEN"]
-    if "language" in session.keys():
-        command.params["locale"] = session["language"]
-
-    data = send_pb_command(command.SerializeToString())
-    result = proto.PbResult()
-    result.ParseFromString(data)
-    images_dir = result.image_files_info.default_image_folder
-    image_files = result.image_files_info.image_files
-    scan_depth = result.image_files_info.depth
-    return {
-        "status": result.status,
-        "images_dir": images_dir,
-        "image_files": image_files,
-        "scan_depth": scan_depth,
-        }
-
-
-def attach_image(scsi_id, **kwargs):
-    """
-    Takes (int) scsi_id and kwargs containing 0 or more device properties
-
-    If the current attached device is a removable device wihout media inserted,
-    this sends a INJECT command to the server.
-    If there is no currently attached device, this sends the ATTACH command to the server.
-
-    Returns (bool) status and (str) msg
-
-    """
-    command = proto.PbCommand()
-    command.params["token"] = current_app.config["TOKEN"]
-    if "language" in session.keys():
-        command.params["locale"] = session["language"]
-    devices = proto.PbDeviceDefinition()
-    devices.id = int(scsi_id)
-
-    if "device_type" in kwargs.keys():
-        if kwargs["device_type"] not in [None, ""]:
-            devices.type = proto.PbDeviceType.Value(str(kwargs["device_type"]))
-    if "unit" in kwargs.keys():
-        if kwargs["unit"] not in [None, ""]:
-            devices.unit = kwargs["unit"]
-    if "image" in kwargs.keys():
-        if kwargs["image"] not in [None, ""]:
-            devices.params["file"] = kwargs["image"]
-
-    # Handling the inserting of media into an attached removable type device
-    device_type = kwargs.get("device_type", None)
-    currently_attached = list_devices(scsi_id, kwargs.get("unit"))["device_list"]
-    if currently_attached:
-        current_type = currently_attached[0]["device_type"]
-    else:
-        current_type = None
-
-    if device_type in REMOVABLE_DEVICE_TYPES and current_type in REMOVABLE_DEVICE_TYPES:
-        if current_type != device_type:
-            return {
-                "status": False,
-                "msg": _(
-                    u"Cannot insert an image for %(device_type)s into a "
-                    u"%(current_device_type)s device",
-                    device_type=device_type,
-                    current_device_type=current_type
-                    ),
-                }
-        command.operation = proto.PbOperation.INSERT
-    # Handling attaching a new device
-    else:
-        command.operation = proto.PbOperation.ATTACH
-        if "interfaces" in kwargs.keys():
-            if kwargs["interfaces"] not in [None, ""]:
-                devices.params["interfaces"] = kwargs["interfaces"]
-        if "vendor" in kwargs.keys():
-            if kwargs["vendor"] is not None:
-                devices.vendor = kwargs["vendor"]
-        if "product" in kwargs.keys():
-            if kwargs["product"] is not None:
-                devices.product = kwargs["product"]
-        if "revision" in kwargs.keys():
-            if kwargs["revision"] is not None:
-                devices.revision = kwargs["revision"]
-        if "block_size" in kwargs.keys():
-            if kwargs["block_size"] not in [None, ""]:
-                devices.block_size = int(kwargs["block_size"])
-
-    command.devices.append(devices)
-
-    data = send_pb_command(command.SerializeToString())
-    result = proto.PbResult()
-    result.ParseFromString(data)
-    return {"status": result.status, "msg": result.msg}
-
-
-def detach_by_id(scsi_id, unit=None):
-    """
-    Takes (int) scsi_id and optional (int) unit.
-    Sends a DETACH command to the server.
-    Returns (bool) status and (str) msg.
-    """
-    devices = proto.PbDeviceDefinition()
-    devices.id = int(scsi_id)
-    if unit is not None:
-        devices.unit = int(unit)
-
-    command = proto.PbCommand()
-    command.operation = proto.PbOperation.DETACH
-    command.devices.append(devices)
-    command.params["token"] = current_app.config["TOKEN"]
-    if "language" in session.keys():
-        command.params["locale"] = session["language"]
-
-    data = send_pb_command(command.SerializeToString())
-    result = proto.PbResult()
-    result.ParseFromString(data)
-    return {"status": result.status, "msg": result.msg}
-
-
-def detach_all():
-    """
-    Sends a DETACH_ALL command to the server.
-    Returns (bool) status and (str) msg.
-    """
-    command = proto.PbCommand()
-    command.operation = proto.PbOperation.DETACH_ALL
-    command.params["token"] = current_app.config["TOKEN"]
-    if "language" in session.keys():
-        command.params["locale"] = session["language"]
-
-    data = send_pb_command(command.SerializeToString())
-    result = proto.PbResult()
-    result.ParseFromString(data)
-    return {"status": result.status, "msg": result.msg}
-
-
-def eject_by_id(scsi_id, unit=None):
-    """
-    Takes (int) scsi_id and optional (int) unit.
-    Sends an EJECT command to the server.
-    Returns (bool) status and (str) msg.
-    """
-    devices = proto.PbDeviceDefinition()
-    devices.id = int(scsi_id)
-    if unit is not None:
-        devices.unit = int(unit)
-
-    command = proto.PbCommand()
-    command.operation = proto.PbOperation.EJECT
-    command.devices.append(devices)
-    command.params["token"] = current_app.config["TOKEN"]
-    if "language" in session.keys():
-        command.params["locale"] = session["language"]
-
-    data = send_pb_command(command.SerializeToString())
-    result = proto.PbResult()
-    result.ParseFromString(data)
-    return {"status": result.status, "msg": result.msg}
-
-
-def list_devices(scsi_id=None, unit=None):
-    """
-    Takes optional (int) scsi_id and optional (int) unit.
-    Sends a DEVICES_INFO command to the server.
-    If no scsi_id is provided, returns a (list) of (dict)s of all attached devices.
-    If scsi_id is is provided, returns a (list) of one (dict) for the given device.
-    If no attached device is found, returns an empty (list).
-    Returns (bool) status, (list) of dicts device_list
-    """
-    command = proto.PbCommand()
-    command.operation = proto.PbOperation.DEVICES_INFO
-    command.params["token"] = current_app.config["TOKEN"]
-    if "language" in session.keys():
-        command.params["locale"] = session["language"]
-
-    # If method is called with scsi_id parameter, return the info on those devices
-    # Otherwise, return the info on all attached devices
-    if scsi_id is not None:
-        device = proto.PbDeviceDefinition()
-        device.id = int(scsi_id)
-        if unit is not None:
-            device.unit = int(unit)
-        command.devices.append(device)
-
-    data = send_pb_command(command.SerializeToString())
-    result = proto.PbResult()
-    result.ParseFromString(data)
-
-    device_list = []
-
-    # Return an empty (list) if no devices are attached
-    if not result.devices_info.devices:
-        return {"status": False, "device_list": []}
-
-    image_files_info = get_image_files_info()
-    i = 0
-    while i < len(result.devices_info.devices):
-        did = result.devices_info.devices[i].id
-        dunit = result.devices_info.devices[i].unit
-        dtype = proto.PbDeviceType.Name(result.devices_info.devices[i].type)
-        dstat = result.devices_info.devices[i].status
-        dprop = result.devices_info.devices[i].properties
-
-        # Building the status string
-        dstat_msg = []
-        if dprop.read_only:
-            dstat_msg.append("Read-Only")
-        if dstat.protected and dprop.protectable:
-            dstat_msg.append("Write-Protected")
-        if dstat.removed and dprop.removable:
-            dstat_msg.append("No Media")
-        if dstat.locked and dprop.lockable:
-            dstat_msg.append("Locked")
-
-        dpath = result.devices_info.devices[i].file.name
-        dfile = dpath.replace(image_files_info["images_dir"] + "/", "")
-        dparam = result.devices_info.devices[i].params
-        dven = result.devices_info.devices[i].vendor
-        dprod = result.devices_info.devices[i].product
-        drev = result.devices_info.devices[i].revision
-        dblock = result.devices_info.devices[i].block_size
-        dsize = int(result.devices_info.devices[i].block_count) * int(dblock)
-
-        device_list.append({
-            "id": did,
-            "unit": dunit,
-            "device_type": dtype,
-            "status": ", ".join(dstat_msg),
-            "image": dpath,
-            "file": dfile,
-            "params": dparam,
-            "vendor": dven,
-            "product": dprod,
-            "revision": drev,
-            "block_size": dblock,
-            "size": dsize,
-            })
-        i += 1
-
-    return {"status": result.status, "msg": result.msg, "device_list": device_list}
-
-
-def reserve_scsi_ids(reserved_scsi_ids):
-    """
-    Sends the RESERVE_IDS command to the server to reserve SCSI IDs.
-    Takes a (list) of (str) as argument.
-    """
-    command = proto.PbCommand()
-    command.operation = proto.PbOperation.RESERVE_IDS
-    command.params["ids"] = ",".join(reserved_scsi_ids)
-    command.params["token"] = current_app.config["TOKEN"]
-    if "language" in session.keys():
-        command.params["locale"] = session["language"]
-
-    data = send_pb_command(command.SerializeToString())
-    result = proto.PbResult()
-    result.ParseFromString(data)
-    return {"status": result.status, "msg": result.msg}
-
-
-def set_log_level(log_level):
-    """
-    Sends a LOG_LEVEL command to the server.
-    Takes (str) log_level as an argument.
-    Returns (bool) status and (str) msg.
-    """
-    command = proto.PbCommand()
-    command.operation = proto.PbOperation.LOG_LEVEL
-    command.params["level"] = str(log_level)
-    command.params["token"] = current_app.config["TOKEN"]
-    if "language" in session.keys():
-        command.params["locale"] = session["language"]
-
-    data = send_pb_command(command.SerializeToString())
-    result = proto.PbResult()
-    result.ParseFromString(data)
-    return {"status": result.status, "msg": result.msg}
-
-
-def shutdown_pi(mode):
-    """
-    Sends a SHUT_DOWN command to the server.
-    Takes (str) mode as an argument.
-    Returns (bool) status and (str) msg.
-    """
-    command = proto.PbCommand()
-    command.operation = proto.PbOperation.SHUT_DOWN
-    command.params["mode"] = str(mode)
-    command.params["token"] = current_app.config["TOKEN"]
-    if "language" in session.keys():
-        command.params["locale"] = session["language"]
-
-    data = send_pb_command(command.SerializeToString())
-    result = proto.PbResult()
-    result.ParseFromString(data)
-    return {"status": result.status, "msg": result.msg}
-
-
-def is_token_auth():
-    """
-    Sends a CHECK_AUTHENTICATION command to the server.
-    Tells you whether RaSCSI backend is protected by a token password or not.
-    Returns (bool) status and (str) msg.
-    """
-    command = proto.PbCommand()
-    command.operation = proto.PbOperation.CHECK_AUTHENTICATION
-    command.params["token"] = current_app.config["TOKEN"]
-    if "language" in session.keys():
-        command.params["locale"] = session["language"]
-
-    data = send_pb_command(command.SerializeToString())
-    result = proto.PbResult()
-    result.ParseFromString(data)
-    return {"status": result.status, "msg": result.msg}
--- a/python/web/src/return_code_mapper.py
+++ b/python/web/src/return_code_mapper.py
@ -0,0 +1,45 @@
+"""Module for mapping between rascsi return codes and translated strings"""
+
+from rascsi.return_codes import ReturnCodes
+from flask_babel import _
+
+
+# pylint: disable=too-few-public-methods
+class ReturnCodeMapper:
+    """Class for mapping between rascsi return codes and translated strings"""
+
+    MESSAGES = {
+        ReturnCodes.DELETEFILE_SUCCESS: _("File deleted: %(file_path)s"),
+        ReturnCodes.DELETEFILE_FILE_NOT_FOUND: _("File to delete not found: %(file_path)s"),
+        ReturnCodes.RENAMEFILE_SUCCESS: _("File moved to: %(target_path)s"),
+        ReturnCodes.RENAMEFILE_UNABLE_TO_MOVE: _("Unable to move file to: %(target_path)s"),
+        ReturnCodes.DOWNLOADFILETOISO_SUCCESS: _("Created CD-ROM ISO image with "
+                                                 "arguments \"%(value)s\""),
+        ReturnCodes.DOWNLOADTODIR_SUCCESS: _("%(file_name)s downloaded to %(save_dir)s"),
+        ReturnCodes.WRITECONFIG_SUCCESS: _("Saved configuration file to %(file_name)s"),
+        ReturnCodes.WRITECONFIG_COULD_NOT_WRITE: _("Could not write to file: %(file_name)s"),
+        ReturnCodes.READCONFIG_SUCCESS: _("Loaded configurations from: %(file_name)s"),
+        ReturnCodes.READCONFIG_COULD_NOT_READ: _("Could not read configuration "
+                                                 "file: %(file_name)s"),
+        ReturnCodes.READCONFIG_INVALID_CONFIG_FILE_FORMAT: _("Invalid configuration file format"),
+        ReturnCodes.WRITEDRIVEPROPS_SUCCESS: _("Created properties file: %(file_path)s"),
+        ReturnCodes.WRITEDRIVEPROPS_COULD_NOT_WRITE: _("Could not write to properties "
+                                                       "file: %(file_path)s"),
+        ReturnCodes.READDRIVEPROPS_SUCCESS: _("Read properties from file: %(file_path)s"),
+        ReturnCodes.READDRIVEPROPS_COULD_NOT_READ: _("Could not read properties from "
+                                                     "file: %(file_path)s"),
+        ReturnCodes.ATTACHIMAGE_COULD_NOT_ATTACH: _("Cannot insert an image for %(device_type)s "
+                                                    "into a %(current_device_type)s device"),
+    }
+
+    @staticmethod
+    def add_msg(payload):
+        """adds a msg key to a given payload with a rascsi module return code
+        with a translated return code message string. """
+        if "return_code" not in payload:
+            return payload
+
+        parameters = payload["parameters"]
+
+        payload["msg"] = _(ReturnCodeMapper.MESSAGES[payload["return_code"]], **parameters)
+        return payload
--- a/python/web/src/settings.py
+++ b/python/web/src/settings.py
@ -3,31 +3,22 @@ Constant definitions used by other modules
 """

 from os import getenv, getcwd
+import rascsi.common_settings

 WEB_DIR = getcwd()
-# There may be a more elegant way to get the HOME dir of the user that installed RaSCSI
 HOME_DIR = "/".join(WEB_DIR.split("/")[0:3])
-CFG_DIR = f"{HOME_DIR}/.config/rascsi"
+
 AFP_DIR = f"{HOME_DIR}/afpshare"

 MAX_FILE_SIZE = getenv("MAX_FILE_SIZE", str(1024 * 1024 * 1024 * 4))  # 4gb

 ARCHIVE_FILE_SUFFIX = "zip"
-CONFIG_FILE_SUFFIX = "json"
-# File ending used for drive properties files
-PROPERTIES_SUFFIX = "properties"

 # The file name of the default config file that loads when rascsi-web starts
-DEFAULT_CONFIG = f"default.{CONFIG_FILE_SUFFIX}"
+DEFAULT_CONFIG = f"default.{rascsi.common_settings.CONFIG_FILE_SUFFIX}"
 # File containing canonical drive properties
 DRIVE_PROPERTIES_FILE = WEB_DIR + "/drive_properties.json"

-REMOVABLE_DEVICE_TYPES = ("SCCD", "SCRM", "SCMO")
-
-# The RESERVATIONS list is used to keep track of the reserved ID memos.
-# Initialize with a list of 8 empty strings.
-RESERVATIONS = ["" for x in range(0, 8)]
-
 # The user group that is used for webapp authentication
 AUTH_GROUP = "rascsi"

--- a/python/web/src/socket_cmds.py
+++ b/python/web/src/socket_cmds.py
@ -1,100 +0,0 @@
-"""
-Module for sending and receiving data over a socket connection with the RaSCSI backend
-"""
-
-import logging
-from time import sleep
-from flask import abort
-from flask_babel import _
-
-def send_pb_command(payload):
-    """
-    Takes a (str) containing a serialized protobuf as argument.
-    Establishes a socket connection with RaSCSI.
-    """
-    # Host and port number where rascsi is listening for socket connections
-    host = 'localhost'
-    port = 6868
-
-    counter = 0
-    tries = 20
-    error_msg = ""
-
-    import socket
-    while counter < tries:
-        try:
-            with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as sock:
-                sock.connect((host, port))
-                return send_over_socket(sock, payload)
-        except socket.error as error:
-            counter += 1
-            logging.warning("The RaSCSI service is not responding - attempt %s/%s",
-                            str(counter), str(tries))
-            error_msg = str(error)
-            sleep(0.2)
-
-    logging.error(error_msg)
-
-    # After failing all attempts, throw a 404 error
-    abort(404, _(
-            u"The RaSCSI Web Interface failed to connect to RaSCSI at %(host)s:%(port)s "
-            u"with error: %(error_msg)s. The RaSCSI process is not running or may have crashed.",
-            host=host, port=port, error_msg=error_msg,
-            )
-        )
-
-
-def send_over_socket(sock, payload):
-    """
-    Takes a socket object and (str) payload with serialized protobuf.
-    Sends payload to RaSCSI over socket and captures the response.
-    Tries to extract and interpret the protobuf header to get response size.
-    Reads data from socket in 2048 bytes chunks until all data is received.
-    """
-    from struct import pack, unpack
-
-    # Sending the magic word "RASCSI" to authenticate with the server
-    sock.send(b"RASCSI")
-    # Prepending a little endian 32bit header with the message size
-    sock.send(pack("<i", len(payload)))
-    sock.send(payload)
-
-    # Receive the first 4 bytes to get the response header
-    response = sock.recv(4)
-    if len(response) >= 4:
-        # Extracting the response header to get the length of the response message
-        response_length = unpack("<i", response)[0]
-        # Reading in chunks, to handle a case where the response message is very large
-        chunks = []
-        bytes_recvd = 0
-        while bytes_recvd < response_length:
-            chunk = sock.recv(min(response_length - bytes_recvd, 2048))
-            if chunk == b'':
-                logging.error(
-                    "Read an empty chunk from the socket. "
-                    "Socket connection has dropped unexpectedly. "
-                    "RaSCSI may have crashed."
-                    )
-                abort(
-                    503, _(
-                        u"The RaSCSI Web Interface lost connection to RaSCSI. "
-                        u"Please go back and try again. "
-                        u"If the issue persists, please report a bug."
-                        )
-                    )
-            chunks.append(chunk)
-            bytes_recvd = bytes_recvd + len(chunk)
-        response_message = b''.join(chunks)
-        return response_message
-
-    logging.error(
-        "The response from RaSCSI did not contain a protobuf header. "
-        "RaSCSI may have crashed."
-        )
-    abort(
-        500, _(
-            u"The RaSCSI Web Interface did not get a valid response from RaSCSI. "
-            u"Please go back and try again. "
-            u"If the issue persists, please report a bug."
-            )
-        )
--- a/python/web/src/socket_cmds_flask.py
+++ b/python/web/src/socket_cmds_flask.py
@ -0,0 +1,60 @@
+"""
+Module for sending and receiving data over a socket connection with the RaSCSI backend
+"""
+
+from flask import abort
+from flask_babel import _
+
+from rascsi.exceptions import (EmptySocketChunkException,
+                               InvalidProtobufResponse,
+                               FailedSocketConnectionException)
+from rascsi.socket_cmds import SocketCmds
+
+
+class SocketCmdsFlask(SocketCmds):
+    """
+    Class for sending and receiving data over a socket connection with the RaSCSI backend
+    """
+    # pylint: disable=useless-super-delegation
+    def __init__(self, host="localhost", port=6868):
+        super().__init__(host, port)
+
+    def send_pb_command(self, payload):
+        """
+        Takes a (str) containing a serialized protobuf as argument.
+        Establishes a socket connection with RaSCSI.
+        """
+        try:
+            return super().send_pb_command(payload)
+        except FailedSocketConnectionException as err:
+            # After failing all attempts, throw a 404 error
+            abort(404, _(
+                "The RaSCSI Web Interface failed to connect to RaSCSI at %(host)s:%(port)s "
+                "with error: %(error_msg)s. The RaSCSI process is not running or may have crashed.",
+                host=self.host, port=self.port, error_msg=str(err),
+                )
+            )
+            return None
+
+    def send_over_socket(self, sock, payload):
+        """Sends a payload over a given socket"""
+        try:
+            return super().send_over_socket(sock, payload)
+        except EmptySocketChunkException:
+            abort(
+                503, _(
+                    "The RaSCSI Web Interface lost connection to RaSCSI. "
+                    "Please go back and try again. "
+                    "If the issue persists, please report a bug."
+                )
+            )
+            return None
+        except InvalidProtobufResponse:
+            abort(
+                500, _(
+                    "The RaSCSI Web Interface did not get a valid response from RaSCSI. "
+                    "Please go back and try again. "
+                    "If the issue persists, please report a bug."
+                )
+            )
+            return None
--- a/python/web/src/web.py
+++ b/python/web/src/web.py
@ -23,22 +23,6 @@ from flask import (
 )
 from flask_babel import Babel, Locale, refresh, _

-from file_cmds import (
-    list_images,
-    list_config_files,
-    create_new_image,
-    download_file_to_iso,
-    delete_image,
-    rename_image,
-    delete_file,
-    rename_file,
-    unzip_file,
-    download_to_dir,
-    write_config,
-    read_config,
-    write_drive_properties,
-    read_drive_properties,
-)
 from pi_cmds import (
    running_env,
    running_proc,
@ -48,43 +32,40 @@ from pi_cmds import (
    introspect_file,
    auth_active,
 )
-from ractl_cmds import (
-    attach_image,
-    list_devices,
-    detach_by_id,
-    eject_by_id,
-    detach_all,
-    get_server_info,
-    get_reserved_ids,
-    get_network_info,
-    get_device_types,
-    reserve_scsi_ids,
-    set_log_level,
-    shutdown_pi,
-    is_token_auth,
-)
+
 from device_utils import (
    sort_and_format_devices,
    get_valid_scsi_ids,
 )
+from return_code_mapper import ReturnCodeMapper
+
 from settings import (
-    CFG_DIR,
    AFP_DIR,
    MAX_FILE_SIZE,
    ARCHIVE_FILE_SUFFIX,
-    CONFIG_FILE_SUFFIX,
-    PROPERTIES_SUFFIX,
    DEFAULT_CONFIG,
    DRIVE_PROPERTIES_FILE,
-    REMOVABLE_DEVICE_TYPES,
-    RESERVATIONS,
    AUTH_GROUP,
    LANGUAGES,
 )

+from rascsi.common_settings import (
+    CFG_DIR,
+    CONFIG_FILE_SUFFIX,
+    PROPERTIES_SUFFIX,
+    REMOVABLE_DEVICE_TYPES,
+    RESERVATIONS,
+)
+from rascsi.ractl_cmds import RaCtlCmds
+from rascsi.file_cmds import FileCmds
+
+from socket_cmds_flask import SocketCmdsFlask
+
+
 APP = Flask(__name__)
 BABEL = Babel(APP)

+
@BABEL.localeselector
 def get_locale():
    """
@ -117,22 +98,22 @@ def index():
    """
    Sets up data structures for and renders the index page
    """
-    if not is_token_auth()["status"] and not APP.config["TOKEN"]:
+    if not ractl.is_token_auth()["status"] and not APP.config["TOKEN"]:
        abort(
            403,
            _(
-                u"RaSCSI is password protected. "
-                u"Start the Web Interface with the --password parameter."
+                "RaSCSI is password protected. "
+                "Start the Web Interface with the --password parameter."
                ),
            )

    locales = get_supported_locales()
-    server_info = get_server_info()
+    server_info = ractl.get_server_info()
    disk = disk_space()
-    devices = list_devices()
-    device_types = get_device_types()
-    image_files = list_images()
-    config_files = list_config_files()
+    devices = ractl.list_devices()
+    device_types = ractl.get_device_types()
+    image_files = file_cmds.list_images()
+    config_files = file_cmds.list_config_files()

    sorted_image_files = sorted(image_files["files"], key=lambda x: x["name"].lower())
    sorted_config_files = sorted(config_files, key=lambda x: x.lower())
@ -187,7 +168,7 @@ def index():
        version=server_info["version"],
        log_levels=server_info["log_levels"],
        current_log_level=server_info["current_log_level"],
-        netinfo=get_network_info(),
+        netinfo=ractl.get_network_info(),
        device_types=device_types["device_types"],
        free_disk=int(disk["free"] / 1024 / 1024),
        valid_file_suffix=valid_file_suffix,
@ -207,14 +188,15 @@ def drive_list():
    """
    Sets up the data structures and kicks off the rendering of the drive list page
    """
-    server_info = get_server_info()
+    server_info = ractl.get_server_info()
    disk = disk_space()

    # Reads the canonical drive properties into a dict
    # The file resides in the current dir of the web ui process
    drive_properties = Path(DRIVE_PROPERTIES_FILE)
    if drive_properties.is_file():
-        process = read_drive_properties(str(drive_properties))
+        process = file_cmds.read_drive_properties(str(drive_properties))
+        process = ReturnCodeMapper.add_msg(process)
        if not process["status"]:
            flash(process["msg"], "error")
            return redirect(url_for("index"))
@ -247,7 +229,7 @@ def drive_list():
            device["size_mb"] = "{:,.2f}".format(device["size"] / 1024 / 1024)
            rm_conf.append(device)

-    files = list_images()
+    files = file_cmds.list_images()
    sorted_image_files = sorted(files["files"], key=lambda x: x["name"].lower())
    hd_conf = sorted(hd_conf, key=lambda x: x["name"].lower())
    cd_conf = sorted(cd_conf, key=lambda x: x["name"].lower())
@ -292,7 +274,7 @@ def login():
            return redirect(url_for("index"))
    flash(
            _(
-                u"You must log in with credentials for a user in the '%(group)s' group",
+                "You must log in with credentials for a user in the '%(group)s' group",
                group=AUTH_GROUP,
                ),
            "error",
@ -347,9 +329,9 @@ def drive_create():
    full_file_name = file_name + "." + file_type

    # Creating the image file
-    process = create_new_image(file_name, file_type, size)
+    process = file_cmds.create_new_image(file_name, file_type, size)
    if process["status"]:
-        flash(_(u"Image file created: %(file_name)s", file_name=full_file_name))
+        flash(_("Image file created: %(file_name)s", file_name=full_file_name))
    else:
        flash(process["msg"], "error")
        return redirect(url_for("index"))
@ -362,7 +344,8 @@ def drive_create():
                "revision": revision,
                "block_size": block_size,
                }
-    process = write_drive_properties(prop_file_name, properties)
+    process = file_cmds.write_drive_properties(prop_file_name, properties)
+    process = ReturnCodeMapper.add_msg(process)
    if process["status"]:
        flash(process["msg"])
        return redirect(url_for("index"))
@ -391,7 +374,8 @@ def drive_cdrom():
        "revision": revision,
        "block_size": block_size,
        }
-    process = write_drive_properties(file_name, properties)
+    process = file_cmds.write_drive_properties(file_name, properties)
+    process = ReturnCodeMapper.add_msg(process)
    if process["status"]:
        flash(process["msg"])
        return redirect(url_for("index"))
@ -409,7 +393,8 @@ def config_save():
    file_name = request.form.get("name") or "default"
    file_name = f"{file_name}.{CONFIG_FILE_SUFFIX}"

-    process = write_config(file_name)
+    process = file_cmds.write_config(file_name)
+    process = ReturnCodeMapper.add_msg(process)
    if process["status"]:
        flash(process["msg"])
        return redirect(url_for("index"))
@ -427,7 +412,8 @@ def config_load():
    file_name = request.form.get("name")

    if "load" in request.form:
-        process = read_config(file_name)
+        process = file_cmds.read_config(file_name)
+        process = ReturnCodeMapper.add_msg(process)
        if process["status"]:
            flash(process["msg"])
            return redirect(url_for("index"))
@ -435,7 +421,8 @@ def config_load():
        flash(process['msg'], "error")
        return redirect(url_for("index"))
    if "delete" in request.form:
-        process = delete_file(f"{CFG_DIR}/{file_name}")
+        process = file_cmds.delete_file(f"{CFG_DIR}/{file_name}")
+        process = ReturnCodeMapper.add_msg(process)
        if process["status"]:
            flash(process["msg"])
            return redirect(url_for("index"))
@ -474,7 +461,7 @@ def show_logs():
        headers = {"content-type": "text/plain"}
        return process.stdout.decode("utf-8"), int(lines), headers

-    flash(_(u"An error occurred when fetching logs."))
+    flash(_("An error occurred when fetching logs."))
    flash(process.stderr.decode("utf-8"), "stderr")
    return redirect(url_for("index"))

@ -487,9 +474,9 @@ def log_level():
    """
    level = request.form.get("level") or "info"

-    process = set_log_level(level)
+    process = ractl.set_log_level(level)
    if process["status"]:
-        flash(_(u"Log level set to %(value)s", value=level))
+        flash(_("Log level set to %(value)s", value=level))
        return redirect(url_for("index"))

    flash(process["msg"], "error")
@ -508,24 +495,24 @@ def daynaport_attach():
    mask = request.form.get("mask")

    error_url = "https://github.com/akuker/RASCSI/wiki/Dayna-Port-SCSI-Link"
-    error_msg = _(u"Please follow the instructions at %(url)s", url=error_url)
+    error_msg = _("Please follow the instructions at %(url)s", url=error_url)

    if interface.startswith("wlan"):
        if not introspect_file("/etc/sysctl.conf", r"^net\.ipv4\.ip_forward=1$"):
-            flash(_(u"Configure IPv4 forwarding before using a wireless network device."), "error")
+            flash(_("Configure IPv4 forwarding before using a wireless network device."), "error")
            flash(error_msg, "error")
            return redirect(url_for("index"))
        if not Path("/etc/iptables/rules.v4").is_file():
-            flash(_(u"Configure NAT before using a wireless network device."), "error")
+            flash(_("Configure NAT before using a wireless network device."), "error")
            flash(error_msg, "error")
            return redirect(url_for("index"))
    else:
        if not introspect_file("/etc/dhcpcd.conf", r"^denyinterfaces " + interface + r"$"):
-            flash(_(u"Configure the network bridge before using a wired network device."), "error")
+            flash(_("Configure the network bridge before using a wired network device."), "error")
            flash(error_msg, "error")
            return redirect(url_for("index"))
        if not Path("/etc/network/interfaces.d/rascsi_bridge").is_file():
-            flash(_(u"Configure the network bridge before using a wired network device."), "error")
+            flash(_("Configure the network bridge before using a wired network device."), "error")
            flash(error_msg, "error")
            return redirect(url_for("index"))

@ -536,9 +523,10 @@ def daynaport_attach():
            arg += (":" + ip_addr + "/" + mask)
        kwargs["interfaces"] = arg

-    process = attach_image(scsi_id, **kwargs)
+    process = ractl.attach_image(scsi_id, **kwargs)
+    process = ReturnCodeMapper.add_msg(process)
    if process["status"]:
-        flash(_(u"Attached DaynaPORT to SCSI ID %(id_number)s", id_number=scsi_id))
+        flash(_("Attached DaynaPORT to SCSI ID %(id_number)s", id_number=scsi_id))
        return redirect(url_for("index"))

    flash(process["msg"], "error")
@ -573,7 +561,8 @@ def attach():
    # same file name with PROPERTIES_SUFFIX appended
    drive_properties = f"{CFG_DIR}/{file_name}.{PROPERTIES_SUFFIX}"
    if Path(drive_properties).is_file():
-        process = read_drive_properties(drive_properties)
+        process = file_cmds.read_drive_properties(drive_properties)
+        process = ReturnCodeMapper.add_msg(process)
        if not process["status"]:
            flash(process["msg"], "error")
            return redirect(url_for("index"))
@ -584,18 +573,19 @@ def attach():
        kwargs["block_size"] = conf["block_size"]
        expected_block_size = conf["block_size"]

-    process = attach_image(scsi_id, **kwargs)
+    process = ractl.attach_image(scsi_id, **kwargs)
+    process = ReturnCodeMapper.add_msg(process)
    if process["status"]:
-        flash(_(u"Attached %(file_name)s to SCSI ID %(id_number)s LUN %(unit_number)s",
+        flash(_("Attached %(file_name)s to SCSI ID %(id_number)s LUN %(unit_number)s",
            file_name=file_name, id_number=scsi_id, unit_number=unit))
        if int(file_size) % int(expected_block_size):
-            flash(_(u"The image file size %(file_size)s bytes is not a multiple of "
+            flash(_("The image file size %(file_size)s bytes is not a multiple of "
                  u"%(block_size)s. RaSCSI will ignore the trailing data. "
                  u"The image may be corrupted, so proceed with caution.",
                  file_size=file_size, block_size=expected_block_size), "error")
        return redirect(url_for("index"))

-    flash(_(u"Failed to attach %(file_name)s to SCSI ID %(id_number)s LUN %(unit_number)s",
+    flash(_("Failed to attach %(file_name)s to SCSI ID %(id_number)s LUN %(unit_number)s",
        file_name=file_name, id_number=scsi_id, unit_number=unit), "error")
    flash(process["msg"], "error")
    return redirect(url_for("index"))
@ -607,9 +597,9 @@ def detach_all_devices():
    """
    Detaches all currently attached devices
    """
-    process = detach_all()
+    process = ractl.detach_all()
    if process["status"]:
-        flash(_(u"Detached all SCSI devices"))
+        flash(_("Detached all SCSI devices"))
        return redirect(url_for("index"))

    flash(process["msg"], "error")
@ -624,13 +614,13 @@ def detach():
    """
    scsi_id = request.form.get("scsi_id")
    unit = request.form.get("unit")
-    process = detach_by_id(scsi_id, unit)
+    process = ractl.detach_by_id(scsi_id, unit)
    if process["status"]:
-        flash(_(u"Detached SCSI ID %(id_number)s LUN %(unit_number)s",
+        flash(_("Detached SCSI ID %(id_number)s LUN %(unit_number)s",
            id_number=scsi_id, unit_number=unit))
        return redirect(url_for("index"))

-    flash(_(u"Failed to detach SCSI ID %(id_number)s LUN %(unit_number)s",
+    flash(_("Failed to detach SCSI ID %(id_number)s LUN %(unit_number)s",
        id_number=scsi_id, unit_number=unit), "error")
    flash(process["msg"], "error")
    return redirect(url_for("index"))
@ -645,13 +635,13 @@ def eject():
    scsi_id = request.form.get("scsi_id")
    unit = request.form.get("unit")

-    process = eject_by_id(scsi_id, unit)
+    process = ractl.eject_by_id(scsi_id, unit)
    if process["status"]:
-        flash(_(u"Ejected SCSI ID %(id_number)s LUN %(unit_number)s",
+        flash(_("Ejected SCSI ID %(id_number)s LUN %(unit_number)s",
            id_number=scsi_id, unit_number=unit))
        return redirect(url_for("index"))

-    flash(_(u"Failed to eject SCSI ID %(id_number)s LUN %(unit_number)s",
+    flash(_("Failed to eject SCSI ID %(id_number)s LUN %(unit_number)s",
        id_number=scsi_id, unit_number=unit), "error")
    flash(process["msg"], "error")
    return redirect(url_for("index"))
@ -664,7 +654,7 @@ def device_info():
    scsi_id = request.form.get("scsi_id")
    unit = request.form.get("unit")

-    devices = list_devices(scsi_id, unit)
+    devices = ractl.list_devices(scsi_id, unit)

    # First check if any device at all was returned
    if not devices["status"]:
@ -674,19 +664,19 @@ def device_info():
    # the one and only device that should have been returned
    device = devices["device_list"][0]
    if str(device["id"]) == scsi_id:
-        flash(_(u"DEVICE INFO"))
+        flash(_("DEVICE INFO"))
        flash("===========")
-        flash(_(u"SCSI ID: %(id_number)s", id_number=device["id"]))
-        flash(_(u"LUN: %(unit_number)s", unit_number=device["unit"]))
-        flash(_(u"Type: %(device_type)s", device_type=device["device_type"]))
-        flash(_(u"Status: %(device_status)s", device_status=device["status"]))
-        flash(_(u"File: %(image_file)s", image_file=device["image"]))
-        flash(_(u"Parameters: %(value)s", value=device["params"]))
-        flash(_(u"Vendor: %(value)s", value=device["vendor"]))
-        flash(_(u"Product: %(value)s", value=device["product"]))
-        flash(_(u"Revision: %(revision_number)s", revision_number=device["revision"]))
-        flash(_(u"Block Size: %(value)s bytes", value=device["block_size"]))
-        flash(_(u"Image Size: %(value)s bytes", value=device["size"]))
+        flash(_("SCSI ID: %(id_number)s", id_number=device["id"]))
+        flash(_("LUN: %(unit_number)s", unit_number=device["unit"]))
+        flash(_("Type: %(device_type)s", device_type=device["device_type"]))
+        flash(_("Status: %(device_status)s", device_status=device["status"]))
+        flash(_("File: %(image_file)s", image_file=device["image"]))
+        flash(_("Parameters: %(value)s", value=device["params"]))
+        flash(_("Vendor: %(value)s", value=device["vendor"]))
+        flash(_("Product: %(value)s", value=device["product"]))
+        flash(_("Revision: %(revision_number)s", revision_number=device["revision"]))
+        flash(_("Block Size: %(value)s bytes", value=device["block_size"]))
+        flash(_("Image Size: %(value)s bytes", value=device["size"]))
        return redirect(url_for("index"))

    flash(devices["msg"], "error")
@ -700,15 +690,15 @@ def reserve_id():
    """
    scsi_id = request.form.get("scsi_id")
    memo = request.form.get("memo")
-    reserved_ids = get_reserved_ids()["ids"]
+    reserved_ids = ractl.get_reserved_ids()["ids"]
    reserved_ids.extend(scsi_id)
-    process = reserve_scsi_ids(reserved_ids)
+    process = ractl.reserve_scsi_ids(reserved_ids)
    if process["status"]:
        RESERVATIONS[int(scsi_id)] = memo
-        flash(_(u"Reserved SCSI ID %(id_number)s", id_number=scsi_id))
+        flash(_("Reserved SCSI ID %(id_number)s", id_number=scsi_id))
        return redirect(url_for("index"))

-    flash(_(u"Failed to reserve SCSI ID %(id_number)s", id_number=scsi_id))
+    flash(_("Failed to reserve SCSI ID %(id_number)s", id_number=scsi_id))
    flash(process["msg"], "error")
    return redirect(url_for("index"))

@ -719,15 +709,15 @@ def unreserve_id():
    Removes the reservation of a SCSI ID as well as the memo for the reservation
    """
    scsi_id = request.form.get("scsi_id")
-    reserved_ids = get_reserved_ids()["ids"]
+    reserved_ids = ractl.get_reserved_ids()["ids"]
    reserved_ids.remove(scsi_id)
-    process = reserve_scsi_ids(reserved_ids)
+    process = ractl.reserve_scsi_ids(reserved_ids)
    if process["status"]:
        RESERVATIONS[int(scsi_id)] = ""
-        flash(_(u"Released the reservation for SCSI ID %(id_number)s", id_number=scsi_id))
+        flash(_("Released the reservation for SCSI ID %(id_number)s", id_number=scsi_id))
        return redirect(url_for("index"))

-    flash(_(u"Failed to release the reservation for SCSI ID %(id_number)s", id_number=scsi_id))
+    flash(_("Failed to release the reservation for SCSI ID %(id_number)s", id_number=scsi_id))
    flash(process["msg"], "error")
    return redirect(url_for("index"))

@ -738,7 +728,7 @@ def restart():
    """
    Restarts the Pi
    """
-    shutdown_pi("reboot")
+    ractl.shutdown_pi("reboot")
    return redirect(url_for("index"))


@ -748,7 +738,7 @@ def shutdown():
    """
    Shuts down the Pi
    """
-    shutdown_pi("system")
+    ractl.shutdown_pi("system")
    return redirect(url_for("index"))


@ -762,21 +752,23 @@ def download_to_iso():
    url = request.form.get("url")
    iso_args = request.form.get("type").split()

-    process = download_file_to_iso(url, *iso_args)
+    process = file_cmds.download_file_to_iso(url, *iso_args)
+    process = ReturnCodeMapper.add_msg(process)
    if process["status"]:
        flash(process["msg"])
-        flash(_(u"Saved image as: %(file_name)s", file_name=process['file_name']))
+        flash(_("Saved image as: %(file_name)s", file_name=process['file_name']))
    else:
-        flash(_(u"Failed to create CD-ROM image from %(url)s", url=url), "error")
+        flash(_("Failed to create CD-ROM image from %(url)s", url=url), "error")
        flash(process["msg"], "error")
        return redirect(url_for("index"))

-    process_attach = attach_image(scsi_id, device_type="SCCD", image=process["file_name"])
+    process_attach = ractl.attach_image(scsi_id, device_type="SCCD", image=process["file_name"])
+    process_attach = ReturnCodeMapper.add_msg(process_attach)
    if process_attach["status"]:
-        flash(_(u"Attached to SCSI ID %(id_number)s", id_number=scsi_id))
+        flash(_("Attached to SCSI ID %(id_number)s", id_number=scsi_id))
        return redirect(url_for("index"))

-    flash(_(u"Failed to attach image to SCSI ID %(id_number)s. Try attaching it manually.",
+    flash(_("Failed to attach image to SCSI ID %(id_number)s. Try attaching it manually.",
        id_number=scsi_id), "error")
    flash(process_attach["msg"], "error")
    return redirect(url_for("index"))
@ -789,13 +781,14 @@ def download_img():
    Downloads a remote file onto the images dir on the Pi
    """
    url = request.form.get("url")
-    server_info = get_server_info()
-    process = download_to_dir(url, server_info["image_dir"], Path(url).name)
+    server_info = ractl.get_server_info()
+    process = file_cmds.download_to_dir(url, server_info["image_dir"], Path(url).name)
+    process = ReturnCodeMapper.add_msg(process)
    if process["status"]:
        flash(process["msg"])
        return redirect(url_for("index"))

-    flash(_(u"Failed to download file from %(url)s", url=url), "error")
+    flash(_("Failed to download file from %(url)s", url=url), "error")
    flash(process["msg"], "error")
    return redirect(url_for("index"))

@ -819,12 +812,13 @@ def download_afp():
        stem_remainder = file_name_stem[:(26 - len(file_name_suffix))]
        appendix_hash = (md5(discarded_portion.encode("utf-8"))).hexdigest().upper()
        file_name = stem_remainder + "#" + appendix_hash[:4] + file_name_suffix
-    process = download_to_dir(url, AFP_DIR, file_name)
+    process = file_cmds.download_to_dir(url, AFP_DIR, file_name)
+    process = ReturnCodeMapper.add_msg(process)
    if process["status"]:
        flash(process["msg"])
        return redirect(url_for("index"))

-    flash(_(u"Failed to download file from %(url)s", url=url), "error")
+    flash(_("Failed to download file from %(url)s", url=url), "error")
    flash(process["msg"], "error")
    return redirect(url_for("index"))

@ -847,7 +841,7 @@ def upload_file():
    file_object = request.files["file"]
    file_name = secure_filename(file_object.filename)

-    server_info = get_server_info()
+    server_info = ractl.get_server_info()

    save_path = path.join(server_info["image_dir"], file_name)
    current_chunk = int(request.form['dzchunkindex'])
@ -855,7 +849,7 @@ def upload_file():
    # Makes sure not to overwrite an existing file,
    # but continues writing to a file transfer in progress
    if path.exists(save_path) and current_chunk == 0:
-        return make_response(_(u"The file already exists!"), 400)
+        return make_response(_("The file already exists!"), 400)

    try:
        with open(save_path, "ab") as save:
@ -863,7 +857,7 @@ def upload_file():
            save.write(file_object.stream.read())
    except OSError:
        log.exception("Could not write to file")
-        return make_response(_(u"Unable to write the file to disk!"), 500)
+        return make_response(_("Unable to write the file to disk!"), 500)

    total_chunks = int(request.form["dztotalchunkcount"])

@ -878,13 +872,13 @@ def upload_file():
                    path.getsize(save_path),
                    request.form['dztotalfilesize'],
                    )
-            return make_response(_(u"Transferred file corrupted!"), 500)
+            return make_response(_("Transferred file corrupted!"), 500)

        log.info("File %s has been uploaded successfully", file_object.filename)
    log.debug("Chunk %s of %s for file %s completed.",
              current_chunk + 1, total_chunks, file_object.filename)

-    return make_response(_(u"File upload successful!"), 200)
+    return make_response(_("File upload successful!"), 200)


@APP.route("/files/create", methods=["POST"])
@ -898,9 +892,9 @@ def create_file():
    file_type = request.form.get("type")
    full_file_name = file_name + "." + file_type

-    process = create_new_image(file_name, file_type, size)
+    process = file_cmds.create_new_image(file_name, file_type, size)
    if process["status"]:
-        flash(_(u"Image file created: %(file_name)s", file_name=full_file_name))
+        flash(_("Image file created: %(file_name)s", file_name=full_file_name))
        return redirect(url_for("index"))

    flash(process["msg"], "error")
@ -925,9 +919,9 @@ def delete():
    """
    file_name = request.form.get("file_name")

-    process = delete_image(file_name)
+    process = file_cmds.delete_image(file_name)
    if process["status"]:
-        flash(_(u"Image file deleted: %(file_name)s", file_name=file_name))
+        flash(_("Image file deleted: %(file_name)s", file_name=file_name))
    else:
        flash(process["msg"], "error")
        return redirect(url_for("index"))
@ -935,7 +929,9 @@ def delete():
    # Delete the drive properties file, if it exists
    prop_file_path = f"{CFG_DIR}/{file_name}.{PROPERTIES_SUFFIX}"
    if Path(prop_file_path).is_file():
-        process = delete_file(prop_file_path)
+        process = file_cmds.delete_file(prop_file_path)
+        process = ReturnCodeMapper.add_msg(process)
+
        if process["status"]:
            flash(process["msg"])
            return redirect(url_for("index"))
@ -955,9 +951,9 @@ def rename():
    file_name = request.form.get("file_name")
    new_file_name = request.form.get("new_file_name")

-    process = rename_image(file_name, new_file_name)
+    process = file_cmds.rename_image(file_name, new_file_name)
    if process["status"]:
-        flash(_(u"Image file renamed to: %(file_name)s", file_name=new_file_name))
+        flash(_("Image file renamed to: %(file_name)s", file_name=new_file_name))
    else:
        flash(process["msg"], "error")
        return redirect(url_for("index"))
@ -966,7 +962,8 @@ def rename():
    prop_file_path = f"{CFG_DIR}/{file_name}.{PROPERTIES_SUFFIX}"
    new_prop_file_path = f"{CFG_DIR}/{new_file_name}.{PROPERTIES_SUFFIX}"
    if Path(prop_file_path).is_file():
-        process = rename_file(prop_file_path, new_prop_file_path)
+        process = file_cmds.rename_file(prop_file_path, new_prop_file_path)
+        process = ReturnCodeMapper.add_msg(process)
        if process["status"]:
            flash(process["msg"])
            return redirect(url_for("index"))
@ -991,19 +988,19 @@ def unzip():
    if zip_members:
        zip_members = literal_eval(zip_members)

-    process = unzip_file(zip_file, zip_member, zip_members)
+    process = file_cmds.unzip_file(zip_file, zip_member, zip_members)
    if process["status"]:
        if not process["msg"]:
-            flash(_(u"Aborted unzip: File(s) with the same name already exists."), "error")
+            flash(_("Aborted unzip: File(s) with the same name already exists."), "error")
            return redirect(url_for("index"))
-        flash(_(u"Unzipped the following files:"))
+        flash(_("Unzipped the following files:"))
        for msg in process["msg"]:
            flash(msg)
        if process["prop_flag"]:
-            flash(_(u"Properties file(s) have been moved to %(directory)s", directory=CFG_DIR))
+            flash(_("Properties file(s) have been moved to %(directory)s", directory=CFG_DIR))
        return redirect(url_for("index"))

-    flash(_(u"Failed to unzip %(zip_file)s", zip_file=zip_file), "error")
+    flash(_("Failed to unzip %(zip_file)s", zip_file=zip_file), "error")
    flash(process["msg"], "error")
    return redirect(url_for("index"))

@ -1015,9 +1012,11 @@ def change_language():
    """
    locale = request.form.get("locale")
    session["language"] = locale
+    ractl.locale = session["language"]
+    file_cmds.locale = session["language"]
    refresh()

-    flash(_(u"Changed Web Interface language to %(locale)s", locale=locale))
+    flash(_("Changed Web Interface language to %(locale)s", locale=locale))
    return redirect(url_for("index"))


@ -1029,8 +1028,10 @@ def load_default_config():
    - Load the default configuration file, if found
    """
    session["language"] = get_locale()
+    ractl.locale = session["language"]
+    file_cmds.locale = session["language"]
    if Path(f"{CFG_DIR}/{DEFAULT_CONFIG}").is_file():
-        read_config(DEFAULT_CONFIG)
+        file_cmds.read_config(DEFAULT_CONFIG)


 if __name__ == "__main__":
@ -1053,9 +1054,27 @@ if __name__ == "__main__":
        action="store",
        help="Token password string for authenticating with RaSCSI",
        )
+    parser.add_argument(
+        "--rascsi-host",
+        type=str,
+        default="localhost",
+        action="store",
+        help="RaSCSI host. Default: localhost",
+    )
+    parser.add_argument(
+        "--rascsi-port",
+        type=str,
+        default=6868,
+        action="store",
+        help="RaSCSI port. Default: 6868",
+    )
    arguments = parser.parse_args()
    APP.config["TOKEN"] = arguments.password

+    sock_cmd = SocketCmdsFlask(host=arguments.rascsi_host, port=arguments.rascsi_port)
+    ractl = RaCtlCmds(sock_cmd=sock_cmd, token=APP.config["TOKEN"])
+    file_cmds = FileCmds(sock_cmd=sock_cmd, ractl=ractl, token=APP.config["TOKEN"])
+
    import bjoern
    print("Serving rascsi-web...")
    bjoern.run(APP, "0.0.0.0", arguments.port)
--- a/python/web/start.sh
+++ b/python/web/start.sh
@ -104,6 +104,8 @@ while [ "$1" != "" ]; do
    shift
 done

+PYTHON_COMMON_PATH=$(dirname $PWD)/common/src
 echo "Starting web server for RaSCSI Web Interface..."
+export PYTHONPATH=$PWD/src:${PYTHON_COMMON_PATH}
 cd src
 python3 web.py ${PORT} ${PASSWORD}