1 files changed, 214 insertions, 0 deletions
diff --git a/dom/cache/DBAction.cpp b/dom/cache/DBAction.cpp
new file mode 100644
index 0000000000..12021ddb27
--- /dev/null
+++ b/dom/cache/DBAction.cpp
@@ -0,0 +1,214 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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/dom/cache/DBAction.h"
+
+#include "mozilla/dom/cache/Connection.h"
+#include "mozilla/dom/cache/DBSchema.h"
+#include "mozilla/dom/cache/FileUtils.h"
+#include "mozilla/dom/cache/QuotaClient.h"
+#include "mozilla/dom/quota/PersistenceType.h"
+#include "mozilla/net/nsFileProtocolHandler.h"
+#include "mozIStorageConnection.h"
+#include "mozIStorageService.h"
+#include "mozStorageCID.h"
+#include "nsIFile.h"
+#include "nsIURI.h"
+#include "nsIURIMutator.h"
+#include "nsIFileURL.h"
+#include "nsThreadUtils.h"
+
+namespace mozilla::dom::cache {
+
+using mozilla::dom::quota::AssertIsOnIOThread;
+using mozilla::dom::quota::Client;
+using mozilla::dom::quota::CloneFileAndAppend;
+using mozilla::dom::quota::PERSISTENCE_TYPE_DEFAULT;
+using mozilla::dom::quota::PersistenceType;
+
+namespace {
+
+nsresult WipeDatabase(const QuotaInfo& aQuotaInfo, nsIFile& aDBFile) {
+  CACHE_TRY_INSPECT(
+      const auto& dbDir,
+      MOZ_TO_RESULT_INVOKE_TYPED(nsCOMPtr<nsIFile>, aDBFile, GetParent));
+
+  CACHE_TRY(RemoveNsIFile(aQuotaInfo, aDBFile));
+
+  // Note, the -wal journal file will be automatically deleted by sqlite when
+  // the new database is created.  No need to explicitly delete it here.
+
+  // Delete the morgue as well.
+  CACHE_TRY(BodyDeleteDir(aQuotaInfo, *dbDir));
+
+  CACHE_TRY(WipePaddingFile(aQuotaInfo, dbDir));
+
+  return NS_OK;
+}
+
+}  // namespace
+
+DBAction::DBAction(Mode aMode) : mMode(aMode) {}
+
+DBAction::~DBAction() = default;
+
+void DBAction::RunOnTarget(SafeRefPtr<Resolver> aResolver,
+                           const QuotaInfo& aQuotaInfo, Data* aOptionalData) {
+  MOZ_ASSERT(!NS_IsMainThread());
+  MOZ_DIAGNOSTIC_ASSERT(aResolver);
+  MOZ_DIAGNOSTIC_ASSERT(aQuotaInfo.mDir);
+
+  if (IsCanceled()) {
+    aResolver->Resolve(NS_ERROR_ABORT);
+    return;
+  }
+
+  const auto resolveErr = [&aResolver](const nsresult rv) {
+    aResolver->Resolve(rv);
+  };
+
+  CACHE_TRY_INSPECT(const auto& dbDir,
+                    CloneFileAndAppend(*aQuotaInfo.mDir, u"cache"_ns), QM_VOID,
+                    resolveErr);
+
+  nsCOMPtr<mozIStorageConnection> conn;
+
+  // Attempt to reuse the connection opened by a previous Action.
+  if (aOptionalData) {
+    conn = aOptionalData->GetConnection();
+  }
+
+  // If there is no previous Action, then we must open one.
+  if (!conn) {
+    CACHE_TRY_UNWRAP(conn, OpenConnection(aQuotaInfo, *dbDir), QM_VOID,
+                     resolveErr);
+    MOZ_DIAGNOSTIC_ASSERT(conn);
+
+    // Save this connection in the shared Data object so later Actions can
+    // use it.  This avoids opening a new connection for every Action.
+    if (aOptionalData) {
+      // Since we know this connection will be around for as long as the
+      // Cache is open, use our special wrapped connection class.  This
+      // will let us perform certain operations once the Cache origin
+      // is closed.
+      nsCOMPtr<mozIStorageConnection> wrapped = new Connection(conn);
+      aOptionalData->SetConnection(wrapped);
+    }
+  }
+
+  RunWithDBOnTarget(std::move(aResolver), aQuotaInfo, dbDir, conn);
+}
+
+Result<nsCOMPtr<mozIStorageConnection>, nsresult> DBAction::OpenConnection(
+    const QuotaInfo& aQuotaInfo, nsIFile& aDBDir) {
+  MOZ_ASSERT(!NS_IsMainThread());
+  MOZ_DIAGNOSTIC_ASSERT(aQuotaInfo.mDirectoryLockId >= 0);
+
+  CACHE_TRY_INSPECT(const bool& exists, MOZ_TO_RESULT_INVOKE(aDBDir, Exists));
+
+  if (!exists) {
+    CACHE_TRY(OkIf(mMode == Create), Err(NS_ERROR_FILE_NOT_FOUND));
+    CACHE_TRY(aDBDir.Create(nsIFile::DIRECTORY_TYPE, 0755));
+  }
+
+  CACHE_TRY_INSPECT(const auto& dbFile,
+                    CloneFileAndAppend(aDBDir, kCachesSQLiteFilename));
+
+  CACHE_TRY_RETURN(OpenDBConnection(aQuotaInfo, *dbFile));
+}
+
+SyncDBAction::SyncDBAction(Mode aMode) : DBAction(aMode) {}
+
+SyncDBAction::~SyncDBAction() = default;
+
+void SyncDBAction::RunWithDBOnTarget(SafeRefPtr<Resolver> aResolver,
+                                     const QuotaInfo& aQuotaInfo,
+                                     nsIFile* aDBDir,
+                                     mozIStorageConnection* aConn) {
+  MOZ_ASSERT(!NS_IsMainThread());
+  MOZ_DIAGNOSTIC_ASSERT(aResolver);
+  MOZ_DIAGNOSTIC_ASSERT(aDBDir);
+  MOZ_DIAGNOSTIC_ASSERT(aConn);
+
+  nsresult rv = RunSyncWithDBOnTarget(aQuotaInfo, aDBDir, aConn);
+  aResolver->Resolve(rv);
+}
+
+Result<nsCOMPtr<mozIStorageConnection>, nsresult> OpenDBConnection(
+    const QuotaInfo& aQuotaInfo, nsIFile& aDBFile) {
+  MOZ_ASSERT(!NS_IsMainThread());
+  MOZ_DIAGNOSTIC_ASSERT(aQuotaInfo.mDirectoryLockId >= -1);
+
+  // Use our default file:// protocol handler directly to construct the database
+  // URL.  This avoids any problems if a plugin registers a custom file://
+  // handler.  If such a custom handler used javascript, then we would have a
+  // bad time running off the main thread here.
+  auto handler = MakeRefPtr<nsFileProtocolHandler>();
+  CACHE_TRY(handler->Init());
+
+  CACHE_TRY_INSPECT(const auto& mutator,
+                    MOZ_TO_RESULT_INVOKE_TYPED(nsCOMPtr<nsIURIMutator>, handler,
+                                               NewFileURIMutator, &aDBFile));
+
+  const nsCString directoryLockIdClause =
+      aQuotaInfo.mDirectoryLockId >= 0
+          ? "&directoryLockId="_ns + IntToCString(aQuotaInfo.mDirectoryLockId)
+          : EmptyCString();
+
+  nsCOMPtr<nsIFileURL> dbFileUrl;
+  CACHE_TRY(NS_MutateURI(mutator)
+                .SetQuery("cache=private"_ns + directoryLockIdClause)
+                .Finalize(dbFileUrl));
+
+  CACHE_TRY_INSPECT(
+      const auto& storageService,
+      ToResultGet<nsCOMPtr<mozIStorageService>>(
+          MOZ_SELECT_OVERLOAD(do_GetService), MOZ_STORAGE_SERVICE_CONTRACTID),
+      Err(NS_ERROR_UNEXPECTED));
+
+  CACHE_TRY_UNWRAP(
+      auto conn,
+      MOZ_TO_RESULT_INVOKE_TYPED(nsCOMPtr<mozIStorageConnection>,
+                                 storageService, OpenDatabaseWithFileURL,
+                                 dbFileUrl, ""_ns)
+          .orElse([&aQuotaInfo, &aDBFile, &storageService,
+                   &dbFileUrl](const nsresult rv)
+                      -> Result<nsCOMPtr<mozIStorageConnection>, nsresult> {
+            if (rv == NS_ERROR_FILE_CORRUPTED) {
+              NS_WARNING(
+                  "Cache database corrupted. Recreating empty database.");
+
+              // There is nothing else we can do to recover.  Also, this data
+              // can be deleted by QuotaManager at any time anyways.
+              CACHE_TRY(WipeDatabase(aQuotaInfo, aDBFile));
+
+              CACHE_TRY_RETURN(MOZ_TO_RESULT_INVOKE_TYPED(
+                  nsCOMPtr<mozIStorageConnection>, storageService,
+                  OpenDatabaseWithFileURL, dbFileUrl, ""_ns));
+            }
+            return Err(rv);
+          }));
+
+  // Check the schema to make sure it is not too old.
+  CACHE_TRY_INSPECT(const int32_t& schemaVersion,
+                    MOZ_TO_RESULT_INVOKE(conn, GetSchemaVersion));
+  if (schemaVersion > 0 && schemaVersion < db::kFirstShippedSchemaVersion) {
+    // Close existing connection before wiping database.
+    conn = nullptr;
+
+    CACHE_TRY(WipeDatabase(aQuotaInfo, aDBFile));
+
+    CACHE_TRY_UNWRAP(conn, MOZ_TO_RESULT_INVOKE_TYPED(
+                               nsCOMPtr<mozIStorageConnection>, storageService,
+                               OpenDatabaseWithFileURL, dbFileUrl, ""_ns));
+  }
+
+  CACHE_TRY(db::InitializeConnection(*conn));
+
+  return conn;
+}
+
+}  // namespace mozilla::dom::cache