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728 lines
23 KiB
JavaScript
728 lines
23 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef MERGED_COMPARTMENT
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"use strict";
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this.EXPORTED_SYMBOLS = [
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"Measurement",
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"Provider",
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];
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const {utils: Cu} = Components;
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const MILLISECONDS_PER_DAY = 24 * 60 * 60 * 1000;
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#endif
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Cu.import("resource://gre/modules/Promise.jsm");
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Cu.import("resource://gre/modules/Preferences.jsm");
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Cu.import("resource://gre/modules/Task.jsm");
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Cu.import("resource://gre/modules/Log.jsm");
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Cu.import("resource://services-common/utils.js");
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/**
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* Represents a collection of related pieces/fields of data.
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*
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* This is an abstract base type.
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*
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* This type provides the primary interface for storing, retrieving, and
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* serializing data.
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*
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* Each measurement consists of a set of named fields. Each field is primarily
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* identified by a string name, which must be unique within the measurement.
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*
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* Each derived type must define the following properties:
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*
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* name -- String name of this measurement. This is the primary way
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* measurements are distinguished within a provider.
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*
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* version -- Integer version of this measurement. This is a secondary
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* identifier for a measurement within a provider. The version denotes
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* the behavior of this measurement and the composition of its fields over
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* time. When a new field is added or the behavior of an existing field
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* changes, the version should be incremented. The initial version of a
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* measurement is typically 1.
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*
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* fields -- Object defining the fields this measurement holds. Keys in the
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* object are string field names. Values are objects describing how the
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* field works. The following properties are recognized:
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*
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* type -- The string type of this field. This is typically one of the
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* FIELD_* constants from the Metrics.Storage type.
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*
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*
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* FUTURE: provide hook points for measurements to supplement with custom
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* storage needs.
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*/
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this.Measurement = function () {
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if (!this.name) {
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throw new Error("Measurement must have a name.");
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}
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if (!this.version) {
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throw new Error("Measurement must have a version.");
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}
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if (!Number.isInteger(this.version)) {
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throw new Error("Measurement's version must be an integer: " + this.version);
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}
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if (!this.fields) {
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throw new Error("Measurement must define fields.");
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}
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for (let [name, info] in Iterator(this.fields)) {
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if (!info) {
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throw new Error("Field does not contain metadata: " + name);
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}
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if (!info.type) {
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throw new Error("Field is missing required type property: " + name);
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}
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}
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this._log = Log.repository.getLogger("Services.Metrics.Measurement." + this.name);
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this.id = null;
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this.storage = null;
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this._fields = {};
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this._serializers = {};
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this._serializers[this.SERIALIZE_JSON] = {
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singular: this._serializeJSONSingular.bind(this),
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daily: this._serializeJSONDay.bind(this),
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};
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}
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Measurement.prototype = Object.freeze({
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SERIALIZE_JSON: "json",
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/**
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* Obtain a serializer for this measurement.
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*
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* Implementations should return an object with the following keys:
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*
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* singular -- Serializer for singular data.
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* daily -- Serializer for daily data.
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*
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* Each item is a function that takes a single argument: the data to
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* serialize. The passed data is a subset of that returned from
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* this.getValues(). For "singular," data.singular is passed. For "daily",
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* data.days.get(<day>) is passed.
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*
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* This function receives a single argument: the serialization format we
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* are requesting. This is one of the SERIALIZE_* constants on this base type.
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*
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* For SERIALIZE_JSON, the function should return an object that
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* JSON.stringify() knows how to handle. This could be an anonymous object or
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* array or any object with a property named `toJSON` whose value is a
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* function. The returned object will be added to a larger document
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* containing the results of all `serialize` calls.
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*
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* The default implementation knows how to serialize built-in types using
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* very simple logic. If small encoding size is a goal, the default
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* implementation may not be suitable. If an unknown field type is
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* encountered, the default implementation will error.
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*
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* @param format
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* (string) A SERIALIZE_* constant defining what serialization format
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* to use.
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*/
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serializer: function (format) {
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if (!(format in this._serializers)) {
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throw new Error("Don't know how to serialize format: " + format);
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}
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return this._serializers[format];
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},
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/**
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* Whether this measurement contains the named field.
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*
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* @param name
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* (string) Name of field.
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*
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* @return bool
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*/
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hasField: function (name) {
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return name in this.fields;
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},
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/**
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* The unique identifier for a named field.
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*
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* This will throw if the field is not known.
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*
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* @param name
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* (string) Name of field.
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*/
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fieldID: function (name) {
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let entry = this._fields[name];
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if (!entry) {
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throw new Error("Unknown field: " + name);
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}
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return entry[0];
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},
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fieldType: function (name) {
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let entry = this._fields[name];
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if (!entry) {
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throw new Error("Unknown field: " + name);
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}
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return entry[1];
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},
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_configureStorage: function () {
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let missing = [];
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for (let [name, info] in Iterator(this.fields)) {
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if (this.storage.hasFieldFromMeasurement(this.id, name)) {
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this._fields[name] =
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[this.storage.fieldIDFromMeasurement(this.id, name), info.type];
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continue;
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}
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missing.push([name, info.type]);
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}
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if (!missing.length) {
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return CommonUtils.laterTickResolvingPromise();
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}
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// We only perform a transaction if we have work to do (to avoid
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// extra SQLite overhead).
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return this.storage.enqueueTransaction(function registerFields() {
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for (let [name, type] of missing) {
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this._log.debug("Registering field: " + name + " " + type);
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let id = yield this.storage.registerField(this.id, name, type);
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this._fields[name] = [id, type];
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}
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}.bind(this));
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},
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//---------------------------------------------------------------------------
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// Data Recording Functions
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//
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// Functions in this section are used to record new values against this
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// measurement instance.
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//
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// Generally speaking, these functions will throw if the specified field does
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// not exist or if the storage function requested is not appropriate for the
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// type of that field. These functions will also return a promise that will
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// be resolved when the underlying storage operation has completed.
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//---------------------------------------------------------------------------
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/**
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* Increment a daily counter field in this measurement by 1.
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*
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* By default, the counter for the current day will be incremented.
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*
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* If the field is not known or is not a daily counter, this will throw.
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*
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*
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*
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* @param field
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* (string) The name of the field whose value to increment.
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* @param date
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* (Date) Day on which to increment the counter.
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* @param by
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* (integer) How much to increment by.
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* @return Promise<>
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*/
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incrementDailyCounter: function (field, date=new Date(), by=1) {
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return this.storage.incrementDailyCounterFromFieldID(this.fieldID(field),
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date, by);
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},
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/**
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* Record a new numeric value for a daily discrete numeric field.
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*
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* @param field
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* (string) The name of the field to append a value to.
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* @param value
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* (Number) Number to append.
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* @param date
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* (Date) Day on which to append the value.
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*
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* @return Promise<>
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*/
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addDailyDiscreteNumeric: function (field, value, date=new Date()) {
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return this.storage.addDailyDiscreteNumericFromFieldID(
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this.fieldID(field), value, date);
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},
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/**
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* Record a new text value for a daily discrete text field.
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*
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* This is like `addDailyDiscreteNumeric` but for daily discrete text fields.
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*/
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addDailyDiscreteText: function (field, value, date=new Date()) {
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return this.storage.addDailyDiscreteTextFromFieldID(
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this.fieldID(field), value, date);
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},
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/**
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* Record the last seen value for a last numeric field.
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*
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* @param field
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* (string) The name of the field to set the value of.
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* @param value
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* (Number) The value to set.
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* @param date
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* (Date) When this value was recorded.
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*
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* @return Promise<>
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*/
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setLastNumeric: function (field, value, date=new Date()) {
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return this.storage.setLastNumericFromFieldID(this.fieldID(field), value,
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date);
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},
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/**
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* Record the last seen value for a last text field.
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*
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* This is like `setLastNumeric` except for last text fields.
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*/
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setLastText: function (field, value, date=new Date()) {
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return this.storage.setLastTextFromFieldID(this.fieldID(field), value,
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date);
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},
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/**
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* Record the most recent value for a daily last numeric field.
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*
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* @param field
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* (string) The name of a daily last numeric field.
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* @param value
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* (Number) The value to set.
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* @param date
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* (Date) Day on which to record the last value.
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*
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* @return Promise<>
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*/
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setDailyLastNumeric: function (field, value, date=new Date()) {
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return this.storage.setDailyLastNumericFromFieldID(this.fieldID(field),
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value, date);
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},
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/**
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* Record the most recent value for a daily last text field.
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*
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* This is like `setDailyLastNumeric` except for a daily last text field.
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*/
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setDailyLastText: function (field, value, date=new Date()) {
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return this.storage.setDailyLastTextFromFieldID(this.fieldID(field),
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value, date);
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},
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//---------------------------------------------------------------------------
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// End of data recording APIs.
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//---------------------------------------------------------------------------
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/**
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* Obtain all values stored for this measurement.
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*
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* The default implementation obtains all known types from storage. If the
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* measurement provides custom types or stores values somewhere other than
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* storage, it should define its own implementation.
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*
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* This returns a promise that resolves to a data structure which is
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* understood by the measurement's serialize() function.
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*/
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getValues: function () {
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return this.storage.getMeasurementValues(this.id);
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},
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deleteLastNumeric: function (field) {
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return this.storage.deleteLastNumericFromFieldID(this.fieldID(field));
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},
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deleteLastText: function (field) {
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return this.storage.deleteLastTextFromFieldID(this.fieldID(field));
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},
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/**
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* This method is used by the default serializers to control whether a field
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* is included in the output.
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*
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* There could be legacy fields in storage we no longer care about.
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*
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* This method is a hook to allow measurements to change this behavior, e.g.,
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* to implement a dynamic fieldset.
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*
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* You will also need to override `fieldType`.
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*
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* @return (boolean) true if the specified field should be included in
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* payload output.
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*/
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shouldIncludeField: function (field) {
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return field in this._fields;
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},
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_serializeJSONSingular: function (data) {
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let result = {"_v": this.version};
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for (let [field, value] of data) {
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// There could be legacy fields in storage we no longer care about.
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if (!this.shouldIncludeField(field)) {
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continue;
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}
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let type = this.fieldType(field);
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switch (type) {
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case this.storage.FIELD_LAST_NUMERIC:
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case this.storage.FIELD_LAST_TEXT:
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result[field] = value[1];
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break;
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case this.storage.FIELD_DAILY_COUNTER:
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case this.storage.FIELD_DAILY_DISCRETE_NUMERIC:
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case this.storage.FIELD_DAILY_DISCRETE_TEXT:
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case this.storage.FIELD_DAILY_LAST_NUMERIC:
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case this.storage.FIELD_DAILY_LAST_TEXT:
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continue;
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default:
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throw new Error("Unknown field type: " + type);
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}
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}
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return result;
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},
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_serializeJSONDay: function (data) {
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let result = {"_v": this.version};
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for (let [field, value] of data) {
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if (!this.shouldIncludeField(field)) {
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continue;
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}
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let type = this.fieldType(field);
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switch (type) {
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case this.storage.FIELD_DAILY_COUNTER:
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case this.storage.FIELD_DAILY_DISCRETE_NUMERIC:
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case this.storage.FIELD_DAILY_DISCRETE_TEXT:
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case this.storage.FIELD_DAILY_LAST_NUMERIC:
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case this.storage.FIELD_DAILY_LAST_TEXT:
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result[field] = value;
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break;
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case this.storage.FIELD_LAST_NUMERIC:
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case this.storage.FIELD_LAST_TEXT:
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continue;
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default:
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throw new Error("Unknown field type: " + type);
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}
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}
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return result;
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},
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});
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/**
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* An entity that emits data.
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*
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* A `Provider` consists of a string name (must be globally unique among all
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* known providers) and a set of `Measurement` instances.
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*
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* The main role of a `Provider` is to produce metrics data and to store said
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* data in the storage backend.
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*
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* Metrics data collection is initiated either by a manager calling a
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* `collect*` function on `Provider` instances or by the `Provider` registering
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* to some external event and then reacting whenever they occur.
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*
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* `Provider` implementations interface directly with a storage backend. For
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* common stored values (daily counters, daily discrete values, etc),
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* implementations should interface with storage via the various helper
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* functions on the `Measurement` instances. For custom stored value types,
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* implementations will interact directly with the low-level storage APIs.
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*
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* Because multiple providers exist and could be responding to separate
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* external events simultaneously and because not all operations performed by
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* storage can safely be performed in parallel, writing directly to storage at
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* event time is dangerous. Therefore, interactions with storage must be
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* deferred until it is safe to perform them.
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*
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* This typically looks something like:
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*
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* // This gets called when an external event worthy of recording metrics
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* // occurs. The function receives a numeric value associated with the event.
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* function onExternalEvent (value) {
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* let now = new Date();
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* let m = this.getMeasurement("foo", 1);
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*
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* this.enqueueStorageOperation(function storeExternalEvent() {
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*
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* // We interface with storage via the `Measurement` helper functions.
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* // These each return a promise that will be resolved when the
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* // operation finishes. We rely on behavior of storage where operations
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* // are executed single threaded and sequentially. Therefore, we only
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* // need to return the final promise.
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* m.incrementDailyCounter("foo", now);
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* return m.addDailyDiscreteNumericValue("my_value", value, now);
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* }.bind(this));
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*
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* }
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*
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*
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* `Provider` is an abstract base class. Implementations must define a few
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* properties:
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*
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* name
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* The `name` property should be a string defining the provider's name. The
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* name must be globally unique for the application. The name is used as an
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* identifier to distinguish providers from each other.
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*
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* measurementTypes
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* This must be an array of `Measurement`-derived types. Note that elements
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* in the array are the type functions, not instances. Instances of the
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* `Measurement` are created at run-time by the `Provider` and are bound
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* to the provider and to a specific storage backend.
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*/
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this.Provider = function () {
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if (!this.name) {
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throw new Error("Provider must define a name.");
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}
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if (!Array.isArray(this.measurementTypes)) {
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throw new Error("Provider must define measurement types.");
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}
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this._log = Log.repository.getLogger("Services.Metrics.Provider." + this.name);
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this.measurements = null;
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this.storage = null;
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}
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Provider.prototype = Object.freeze({
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/**
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* Whether the provider only pulls data from other sources.
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*
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* If this is true, the provider pulls data from other sources. By contrast,
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* "push-based" providers subscribe to foreign sources and record/react to
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* external events as they happen.
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*
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* Pull-only providers likely aren't instantiated until a data collection
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* is performed. Thus, implementations cannot rely on a provider instance
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* always being alive. This is an optimization so provider instances aren't
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* dead weight while the application is running.
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*
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* This must be set on the prototype to have an effect.
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*/
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pullOnly: false,
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/**
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* Obtain a `Measurement` from its name and version.
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*
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* If the measurement is not found, an Error is thrown.
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*/
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getMeasurement: function (name, version) {
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if (!Number.isInteger(version)) {
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throw new Error("getMeasurement expects an integer version. Got: " + version);
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}
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let m = this.measurements.get([name, version].join(":"));
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if (!m) {
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throw new Error("Unknown measurement: " + name + " v" + version);
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}
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return m;
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},
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init: function (storage) {
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if (this.storage !== null) {
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throw new Error("Provider() not called. Did the sub-type forget to call it?");
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}
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|
|
if (this.storage) {
|
|
throw new Error("Provider has already been initialized.");
|
|
}
|
|
|
|
this.measurements = new Map();
|
|
this.storage = storage;
|
|
|
|
let self = this;
|
|
return Task.spawn(function init() {
|
|
let pre = self.preInit();
|
|
if (!pre || typeof(pre.then) != "function") {
|
|
throw new Error("preInit() does not return a promise.");
|
|
}
|
|
yield pre;
|
|
|
|
for (let measurementType of self.measurementTypes) {
|
|
let measurement = new measurementType();
|
|
|
|
measurement.provider = self;
|
|
measurement.storage = self.storage;
|
|
|
|
let id = yield storage.registerMeasurement(self.name, measurement.name,
|
|
measurement.version);
|
|
|
|
measurement.id = id;
|
|
|
|
yield measurement._configureStorage();
|
|
|
|
self.measurements.set([measurement.name, measurement.version].join(":"),
|
|
measurement);
|
|
}
|
|
|
|
let post = self.postInit();
|
|
if (!post || typeof(post.then) != "function") {
|
|
throw new Error("postInit() does not return a promise.");
|
|
}
|
|
yield post;
|
|
});
|
|
},
|
|
|
|
shutdown: function () {
|
|
let promise = this.onShutdown();
|
|
|
|
if (!promise || typeof(promise.then) != "function") {
|
|
throw new Error("onShutdown implementation does not return a promise.");
|
|
}
|
|
|
|
return promise;
|
|
},
|
|
|
|
/**
|
|
* Hook point for implementations to perform pre-initialization activity.
|
|
*
|
|
* This method will be called before measurement registration.
|
|
*
|
|
* Implementations should return a promise which is resolved when
|
|
* initialization activities have completed.
|
|
*/
|
|
preInit: function () {
|
|
return CommonUtils.laterTickResolvingPromise();
|
|
},
|
|
|
|
/**
|
|
* Hook point for implementations to perform post-initialization activity.
|
|
*
|
|
* This method will be called after `preInit` and measurement registration,
|
|
* but before initialization is finished.
|
|
*
|
|
* If a `Provider` instance needs to register observers, etc, it should
|
|
* implement this function.
|
|
*
|
|
* Implementations should return a promise which is resolved when
|
|
* initialization activities have completed.
|
|
*/
|
|
postInit: function () {
|
|
return CommonUtils.laterTickResolvingPromise();
|
|
},
|
|
|
|
/**
|
|
* Hook point for shutdown of instances.
|
|
*
|
|
* This is the opposite of `onInit`. If a `Provider` needs to unregister
|
|
* observers, etc, this is where it should do it.
|
|
*
|
|
* Implementations should return a promise which is resolved when
|
|
* shutdown activities have completed.
|
|
*/
|
|
onShutdown: function () {
|
|
return CommonUtils.laterTickResolvingPromise();
|
|
},
|
|
|
|
/**
|
|
* Collects data that doesn't change during the application's lifetime.
|
|
*
|
|
* Implementations should return a promise that resolves when all data has
|
|
* been collected and storage operations have been finished.
|
|
*
|
|
* @return Promise<>
|
|
*/
|
|
collectConstantData: function () {
|
|
return CommonUtils.laterTickResolvingPromise();
|
|
},
|
|
|
|
/**
|
|
* Collects data approximately every day.
|
|
*
|
|
* For long-running applications, this is called approximately every day.
|
|
* It may or may not be called every time the application is run. It also may
|
|
* be called more than once per day.
|
|
*
|
|
* Implementations should return a promise that resolves when all data has
|
|
* been collected and storage operations have completed.
|
|
*
|
|
* @return Promise<>
|
|
*/
|
|
collectDailyData: function () {
|
|
return CommonUtils.laterTickResolvingPromise();
|
|
},
|
|
|
|
/**
|
|
* Queue a deferred storage operation.
|
|
*
|
|
* Deferred storage operations are the preferred method for providers to
|
|
* interact with storage. When collected data is to be added to storage,
|
|
* the provider creates a function that performs the necessary storage
|
|
* interactions and then passes that function to this function. Pending
|
|
* storage operations will be executed sequentially by a coordinator.
|
|
*
|
|
* The passed function should return a promise which will be resolved upon
|
|
* completion of storage interaction.
|
|
*/
|
|
enqueueStorageOperation: function (func) {
|
|
return this.storage.enqueueOperation(func);
|
|
},
|
|
|
|
/**
|
|
* Obtain persisted provider state.
|
|
*
|
|
* Provider state consists of key-value pairs of string names and values.
|
|
* Providers can stuff whatever they want into state. They are encouraged to
|
|
* store as little as possible for performance reasons.
|
|
*
|
|
* State is backed by storage and is robust.
|
|
*
|
|
* These functions do not enqueue on storage automatically, so they should
|
|
* be guarded by `enqueueStorageOperation` or some other mutex.
|
|
*
|
|
* @param key
|
|
* (string) The property to retrieve.
|
|
*
|
|
* @return Promise<string|null> String value on success. null if no state
|
|
* is available under this key.
|
|
*/
|
|
getState: function (key) {
|
|
return this.storage.getProviderState(this.name, key);
|
|
},
|
|
|
|
/**
|
|
* Set state for this provider.
|
|
*
|
|
* This is the complementary API for `getState` and obeys the same
|
|
* storage restrictions.
|
|
*/
|
|
setState: function (key, value) {
|
|
return this.storage.setProviderState(this.name, key, value);
|
|
},
|
|
|
|
_dateToDays: function (date) {
|
|
return Math.floor(date.getTime() / MILLISECONDS_PER_DAY);
|
|
},
|
|
|
|
_daysToDate: function (days) {
|
|
return new Date(days * MILLISECONDS_PER_DAY);
|
|
},
|
|
});
|
|
|