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tenfourfox/storage/VacuumManager.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: sw=2 ts=2 et lcs=trail\:.,tab\:>~ :
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/DebugOnly.h"
#include "VacuumManager.h"
#include "mozilla/Services.h"
#include "mozilla/Preferences.h"
#include "nsIObserverService.h"
#include "nsIFile.h"
#include "nsThreadUtils.h"
#include "mozilla/Logging.h"
#include "prtime.h"
#include "mozStorageConnection.h"
#include "mozIStorageStatement.h"
#include "mozIStorageAsyncStatement.h"
#include "mozIStoragePendingStatement.h"
#include "mozIStorageError.h"
#include "mozStorageHelper.h"
#include "nsXULAppAPI.h"
#define OBSERVER_TOPIC_IDLE_DAILY "idle-daily"
#define OBSERVER_TOPIC_XPCOM_SHUTDOWN "xpcom-shutdown"
// Used to notify begin and end of a heavy IO task.
#define OBSERVER_TOPIC_HEAVY_IO "heavy-io-task"
#define OBSERVER_DATA_VACUUM_BEGIN NS_LITERAL_STRING("vacuum-begin")
#define OBSERVER_DATA_VACUUM_END NS_LITERAL_STRING("vacuum-end")
// This preferences root will contain last vacuum timestamps (in seconds) for
// each database. The database filename is used as a key.
#define PREF_VACUUM_BRANCH "storage.vacuum.last."
// Time between subsequent vacuum calls for a certain database.
#define VACUUM_INTERVAL_SECONDS 30 * 86400 // 30 days.
extern PRLogModuleInfo *gStorageLog;
namespace mozilla {
namespace storage {
namespace {
////////////////////////////////////////////////////////////////////////////////
//// BaseCallback
class BaseCallback : public mozIStorageStatementCallback
{
public:
NS_DECL_ISUPPORTS
NS_DECL_MOZISTORAGESTATEMENTCALLBACK
BaseCallback() {}
protected:
virtual ~BaseCallback() {}
};
NS_IMETHODIMP
BaseCallback::HandleError(mozIStorageError *aError)
{
#ifdef DEBUG
int32_t result;
nsresult rv = aError->GetResult(&result);
NS_ENSURE_SUCCESS(rv, rv);
nsAutoCString message;
rv = aError->GetMessage(message);
NS_ENSURE_SUCCESS(rv, rv);
nsAutoCString warnMsg;
warnMsg.AppendLiteral("An error occured during async execution: ");
warnMsg.AppendInt(result);
warnMsg.Append(' ');
warnMsg.Append(message);
NS_WARNING(warnMsg.get());
#endif
return NS_OK;
}
NS_IMETHODIMP
BaseCallback::HandleResult(mozIStorageResultSet *aResultSet)
{
// We could get results from PRAGMA statements, but we don't mind them.
return NS_OK;
}
NS_IMETHODIMP
BaseCallback::HandleCompletion(uint16_t aReason)
{
// By default BaseCallback will just be silent on completion.
return NS_OK;
}
NS_IMPL_ISUPPORTS(
BaseCallback
, mozIStorageStatementCallback
)
////////////////////////////////////////////////////////////////////////////////
//// Vacuumer declaration.
class Vacuumer : public BaseCallback
{
public:
NS_DECL_MOZISTORAGESTATEMENTCALLBACK
explicit Vacuumer(mozIStorageVacuumParticipant *aParticipant);
bool execute();
nsresult notifyCompletion(bool aSucceeded);
private:
nsCOMPtr<mozIStorageVacuumParticipant> mParticipant;
nsCString mDBFilename;
nsCOMPtr<mozIStorageConnection> mDBConn;
};
////////////////////////////////////////////////////////////////////////////////
//// Vacuumer implementation.
Vacuumer::Vacuumer(mozIStorageVacuumParticipant *aParticipant)
: mParticipant(aParticipant)
{
}
bool
Vacuumer::execute()
{
MOZ_ASSERT(NS_IsMainThread(), "Must be running on the main thread!");
// Get the connection and check its validity.
nsresult rv = mParticipant->GetDatabaseConnection(getter_AddRefs(mDBConn));
NS_ENSURE_SUCCESS(rv, false);
bool ready = false;
if (!mDBConn || NS_FAILED(mDBConn->GetConnectionReady(&ready)) || !ready) {
NS_WARNING("Unable to get a connection to vacuum database");
return false;
}
// Ask for the expected page size. Vacuum can change the page size, unless
// the database is using WAL journaling.
// TODO Bug 634374: figure out a strategy to fix page size with WAL.
int32_t expectedPageSize = 0;
rv = mParticipant->GetExpectedDatabasePageSize(&expectedPageSize);
if (NS_FAILED(rv) || !Service::pageSizeIsValid(expectedPageSize)) {
NS_WARNING("Invalid page size requested for database, will use default ");
NS_WARNING(mDBFilename.get());
expectedPageSize = Service::getDefaultPageSize();
}
// Get the database filename. Last vacuum time is stored under this name
// in PREF_VACUUM_BRANCH.
nsCOMPtr<nsIFile> databaseFile;
mDBConn->GetDatabaseFile(getter_AddRefs(databaseFile));
if (!databaseFile) {
NS_WARNING("Trying to vacuum a in-memory database!");
return false;
}
nsAutoString databaseFilename;
rv = databaseFile->GetLeafName(databaseFilename);
NS_ENSURE_SUCCESS(rv, false);
mDBFilename = NS_ConvertUTF16toUTF8(databaseFilename);
MOZ_ASSERT(!mDBFilename.IsEmpty(), "Database filename cannot be empty");
// Check interval from last vacuum.
int32_t now = static_cast<int32_t>(PR_Now() / PR_USEC_PER_SEC);
int32_t lastVacuum;
nsAutoCString prefName(PREF_VACUUM_BRANCH);
prefName += mDBFilename;
rv = Preferences::GetInt(prefName.get(), &lastVacuum);
if (NS_SUCCEEDED(rv) && (now - lastVacuum) < VACUUM_INTERVAL_SECONDS) {
// This database was vacuumed recently, skip it.
return false;
}
// Notify that we are about to start vacuuming. The participant can opt-out
// if it cannot handle a vacuum at this time, and then we'll move to the next
// one.
bool vacuumGranted = false;
rv = mParticipant->OnBeginVacuum(&vacuumGranted);
NS_ENSURE_SUCCESS(rv, false);
if (!vacuumGranted) {
return false;
}
// Notify a heavy IO task is about to start.
nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
if (os) {
DebugOnly<nsresult> rv =
os->NotifyObservers(nullptr, OBSERVER_TOPIC_HEAVY_IO,
OBSERVER_DATA_VACUUM_BEGIN.get());
MOZ_ASSERT(NS_SUCCEEDED(rv), "Should be able to notify");
}
// Execute the statements separately, since the pragma may conflict with the
// vacuum, if they are executed in the same transaction.
nsCOMPtr<mozIStorageAsyncStatement> pageSizeStmt;
nsAutoCString pageSizeQuery(MOZ_STORAGE_UNIQUIFY_QUERY_STR
"PRAGMA page_size = ");
pageSizeQuery.AppendInt(expectedPageSize);
rv = mDBConn->CreateAsyncStatement(pageSizeQuery,
getter_AddRefs(pageSizeStmt));
NS_ENSURE_SUCCESS(rv, false);
RefPtr<BaseCallback> callback = new BaseCallback();
nsCOMPtr<mozIStoragePendingStatement> ps;
rv = pageSizeStmt->ExecuteAsync(callback, getter_AddRefs(ps));
NS_ENSURE_SUCCESS(rv, false);
nsCOMPtr<mozIStorageAsyncStatement> stmt;
rv = mDBConn->CreateAsyncStatement(NS_LITERAL_CSTRING(
"VACUUM"
), getter_AddRefs(stmt));
NS_ENSURE_SUCCESS(rv, false);
rv = stmt->ExecuteAsync(this, getter_AddRefs(ps));
NS_ENSURE_SUCCESS(rv, false);
return true;
}
////////////////////////////////////////////////////////////////////////////////
//// mozIStorageStatementCallback
NS_IMETHODIMP
Vacuumer::HandleError(mozIStorageError *aError)
{
#ifdef DEBUG
int32_t result;
nsresult rv = aError->GetResult(&result);
NS_ENSURE_SUCCESS(rv, rv);
nsAutoCString message;
rv = aError->GetMessage(message);
NS_ENSURE_SUCCESS(rv, rv);
nsAutoCString warnMsg;
warnMsg.AppendLiteral("Unable to vacuum database: ");
warnMsg.Append(mDBFilename);
warnMsg.AppendLiteral(" - ");
warnMsg.AppendInt(result);
warnMsg.Append(' ');
warnMsg.Append(message);
NS_WARNING(warnMsg.get());
#endif
if (MOZ_LOG_TEST(gStorageLog, LogLevel::Error)) {
int32_t result;
nsresult rv = aError->GetResult(&result);
NS_ENSURE_SUCCESS(rv, rv);
nsAutoCString message;
rv = aError->GetMessage(message);
NS_ENSURE_SUCCESS(rv, rv);
MOZ_LOG(gStorageLog, LogLevel::Error,
("Vacuum failed with error: %d '%s'. Database was: '%s'",
result, message.get(), mDBFilename.get()));
}
return NS_OK;
}
NS_IMETHODIMP
Vacuumer::HandleResult(mozIStorageResultSet *aResultSet)
{
NS_NOTREACHED("Got a resultset from a vacuum?");
return NS_OK;
}
NS_IMETHODIMP
Vacuumer::HandleCompletion(uint16_t aReason)
{
if (aReason == REASON_FINISHED) {
// Update last vacuum time.
int32_t now = static_cast<int32_t>(PR_Now() / PR_USEC_PER_SEC);
MOZ_ASSERT(!mDBFilename.IsEmpty(), "Database filename cannot be empty");
nsAutoCString prefName(PREF_VACUUM_BRANCH);
prefName += mDBFilename;
DebugOnly<nsresult> rv = Preferences::SetInt(prefName.get(), now);
MOZ_ASSERT(NS_SUCCEEDED(rv), "Should be able to set a preference");
}
notifyCompletion(aReason == REASON_FINISHED);
return NS_OK;
}
nsresult
Vacuumer::notifyCompletion(bool aSucceeded)
{
nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
if (os) {
os->NotifyObservers(nullptr, OBSERVER_TOPIC_HEAVY_IO,
OBSERVER_DATA_VACUUM_END.get());
}
nsresult rv = mParticipant->OnEndVacuum(aSucceeded);
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
} // namespace
////////////////////////////////////////////////////////////////////////////////
//// VacuumManager
NS_IMPL_ISUPPORTS(
VacuumManager
, nsIObserver
)
VacuumManager *
VacuumManager::gVacuumManager = nullptr;
VacuumManager *
VacuumManager::getSingleton()
{
//Don't allocate it in the child Process.
if (!XRE_IsParentProcess()) {
return nullptr;
}
if (gVacuumManager) {
NS_ADDREF(gVacuumManager);
return gVacuumManager;
}
gVacuumManager = new VacuumManager();
if (gVacuumManager) {
NS_ADDREF(gVacuumManager);
}
return gVacuumManager;
}
VacuumManager::VacuumManager()
: mParticipants("vacuum-participant")
{
MOZ_ASSERT(!gVacuumManager,
"Attempting to create two instances of the service!");
gVacuumManager = this;
}
VacuumManager::~VacuumManager()
{
// Remove the static reference to the service. Check to make sure its us
// in case somebody creates an extra instance of the service.
MOZ_ASSERT(gVacuumManager == this,
"Deleting a non-singleton instance of the service");
if (gVacuumManager == this) {
gVacuumManager = nullptr;
}
}
////////////////////////////////////////////////////////////////////////////////
//// nsIObserver
NS_IMETHODIMP
VacuumManager::Observe(nsISupports *aSubject,
const char *aTopic,
const char16_t *aData)
{
if (strcmp(aTopic, OBSERVER_TOPIC_IDLE_DAILY) == 0) {
// Try to run vacuum on all registered entries. Will stop at the first
// successful one.
nsCOMArray<mozIStorageVacuumParticipant> entries;
mParticipants.GetEntries(entries);
// If there are more entries than what a month can contain, we could end up
// skipping some, since we run daily. So we use a starting index.
static const char* kPrefName = PREF_VACUUM_BRANCH "index";
int32_t startIndex = Preferences::GetInt(kPrefName, 0);
if (startIndex >= entries.Count()) {
startIndex = 0;
}
int32_t index;
for (index = startIndex; index < entries.Count(); ++index) {
RefPtr<Vacuumer> vacuum = new Vacuumer(entries[index]);
// Only vacuum one database per day.
if (vacuum->execute()) {
break;
}
}
DebugOnly<nsresult> rv = Preferences::SetInt(kPrefName, index);
MOZ_ASSERT(NS_SUCCEEDED(rv), "Should be able to set a preference");
}
return NS_OK;
}
} // namespace storage
} // namespace mozilla
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