The Tor Browser: storage/src/VacuumManager.cpp@6474c204b198 (annotated)

storage/src/VacuumManager.cpp@6474c204b198 (annotated)

storage/src/VacuumManager.cpp

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* -*- 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 "prlog.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.
 #ifdef PR_LOGGING
 extern PRLogModuleInfo *gStorageLog;
 #endif
 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.AppendLiteral(" ");
   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
   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);
   nsRefPtr<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.AppendLiteral(" ");
   warnMsg.Append(message);
   NS_WARNING(warnMsg.get());
 #endif
 #ifdef PR_LOGGING
   {
     int32_t result;
     nsresult rv = aError->GetResult(&result);
     NS_ENSURE_SUCCESS(rv, rv);
     nsAutoCString message;
     rv = aError->GetMessage(message);
     NS_ENSURE_SUCCESS(rv, rv);
     PR_LOG(gStorageLog, PR_LOG_ERROR,
            ("Vacuum failed with error: %d '%s'. Database was: '%s'",
             result, message.get(), mDBFilename.get()));
   }
 #endif
   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;
 }
 } // Anonymous namespace.
 ////////////////////////////////////////////////////////////////////////////////
 //// VacuumManager
 NS_IMPL_ISUPPORTS(
   VacuumManager
 , nsIObserver
 )
 VacuumManager *
 VacuumManager::gVacuumManager = nullptr;
 VacuumManager *
 VacuumManager::getSingleton()
 {
   //Don't allocate it in the child Process.
   if (XRE_GetProcessType() != GeckoProcessType_Default) {
     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) {
       nsRefPtr<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

The Tor Browser / annotate

storage/src/VacuumManager.cpp@6474c204b198 (annotated)

storage/src/VacuumManager.cpp