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gecko-dev/storage/mozStorageConnection.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 <stdio.h>
#include "nsError.h"
#include "nsIMutableArray.h"
#include "nsAutoPtr.h"
#include "nsIMemoryReporter.h"
#include "nsThreadUtils.h"
#include "nsIFile.h"
#include "nsIFileURL.h"
#include "mozilla/Telemetry.h"
#include "mozilla/Mutex.h"
#include "mozilla/CondVar.h"
#include "mozilla/Attributes.h"
#include "mozilla/ErrorNames.h"
#include "mozilla/Unused.h"
#include "mozilla/dom/quota/QuotaObject.h"
#include "mozilla/ScopeExit.h"
#include "mozIStorageAggregateFunction.h"
#include "mozIStorageCompletionCallback.h"
#include "mozIStorageFunction.h"
#include "mozStorageAsyncStatementExecution.h"
#include "mozStorageSQLFunctions.h"
#include "mozStorageConnection.h"
#include "mozStorageService.h"
#include "mozStorageStatement.h"
#include "mozStorageAsyncStatement.h"
#include "mozStorageArgValueArray.h"
#include "mozStoragePrivateHelpers.h"
#include "mozStorageStatementData.h"
#include "StorageBaseStatementInternal.h"
#include "SQLCollations.h"
#include "FileSystemModule.h"
#include "mozStorageHelper.h"
#include "GeckoProfiler.h"
#include "mozilla/Logging.h"
#include "mozilla/Printf.h"
#include "nsProxyRelease.h"
#include <algorithm>
#define MIN_AVAILABLE_BYTES_PER_CHUNKED_GROWTH 524288000 // 500 MiB
// Maximum size of the pages cache per connection.
#define MAX_CACHE_SIZE_KIBIBYTES 2048 // 2 MiB
mozilla::LazyLogModule gStorageLog("mozStorage");
// Checks that the protected code is running on the main-thread only if the
// connection was also opened on it.
#ifdef DEBUG
#define CHECK_MAINTHREAD_ABUSE() \
do { \
nsCOMPtr<nsIThread> mainThread = do_GetMainThread(); \
NS_WARNING_ASSERTION( \
threadOpenedOn == mainThread || !NS_IsMainThread(), \
"Using Storage synchronous API on main-thread, but the connection was " \
"opened on another thread."); \
} while(0)
#else
#define CHECK_MAINTHREAD_ABUSE() do { /* Nothing */ } while(0)
#endif
namespace mozilla {
namespace storage {
using mozilla::dom::quota::QuotaObject;
const char *GetVFSName();
namespace {
int
nsresultToSQLiteResult(nsresult aXPCOMResultCode)
{
if (NS_SUCCEEDED(aXPCOMResultCode)) {
return SQLITE_OK;
}
switch (aXPCOMResultCode) {
case NS_ERROR_FILE_CORRUPTED:
return SQLITE_CORRUPT;
case NS_ERROR_FILE_ACCESS_DENIED:
return SQLITE_CANTOPEN;
case NS_ERROR_STORAGE_BUSY:
return SQLITE_BUSY;
case NS_ERROR_FILE_IS_LOCKED:
return SQLITE_LOCKED;
case NS_ERROR_FILE_READ_ONLY:
return SQLITE_READONLY;
case NS_ERROR_STORAGE_IOERR:
return SQLITE_IOERR;
case NS_ERROR_FILE_NO_DEVICE_SPACE:
return SQLITE_FULL;
case NS_ERROR_OUT_OF_MEMORY:
return SQLITE_NOMEM;
case NS_ERROR_UNEXPECTED:
return SQLITE_MISUSE;
case NS_ERROR_ABORT:
return SQLITE_ABORT;
case NS_ERROR_STORAGE_CONSTRAINT:
return SQLITE_CONSTRAINT;
default:
return SQLITE_ERROR;
}
MOZ_MAKE_COMPILER_ASSUME_IS_UNREACHABLE("Must return in switch above!");
}
////////////////////////////////////////////////////////////////////////////////
//// Variant Specialization Functions (variantToSQLiteT)
int
sqlite3_T_int(sqlite3_context *aCtx,
int aValue)
{
::sqlite3_result_int(aCtx, aValue);
return SQLITE_OK;
}
int
sqlite3_T_int64(sqlite3_context *aCtx,
sqlite3_int64 aValue)
{
::sqlite3_result_int64(aCtx, aValue);
return SQLITE_OK;
}
int
sqlite3_T_double(sqlite3_context *aCtx,
double aValue)
{
::sqlite3_result_double(aCtx, aValue);
return SQLITE_OK;
}
int
sqlite3_T_text(sqlite3_context *aCtx,
const nsCString &aValue)
{
::sqlite3_result_text(aCtx,
aValue.get(),
aValue.Length(),
SQLITE_TRANSIENT);
return SQLITE_OK;
}
int
sqlite3_T_text16(sqlite3_context *aCtx,
const nsString &aValue)
{
::sqlite3_result_text16(aCtx,
aValue.get(),
aValue.Length() * 2, // Number of bytes.
SQLITE_TRANSIENT);
return SQLITE_OK;
}
int
sqlite3_T_null(sqlite3_context *aCtx)
{
::sqlite3_result_null(aCtx);
return SQLITE_OK;
}
int
sqlite3_T_blob(sqlite3_context *aCtx,
const void *aData,
int aSize)
{
::sqlite3_result_blob(aCtx, aData, aSize, free);
return SQLITE_OK;
}
#include "variantToSQLiteT_impl.h"
////////////////////////////////////////////////////////////////////////////////
//// Modules
struct Module
{
const char* name;
int (*registerFunc)(sqlite3*, const char*);
};
Module gModules[] = {
{ "filesystem", RegisterFileSystemModule }
};
////////////////////////////////////////////////////////////////////////////////
//// Local Functions
int tracefunc (unsigned aReason, void *aClosure, void *aP, void *aX)
{
switch (aReason) {
case SQLITE_TRACE_STMT: {
// aP is a pointer to the prepared statement.
sqlite3_stmt* stmt = static_cast<sqlite3_stmt*>(aP);
// aX is a pointer to a string containing the unexpanded SQL or a comment,
// starting with "--"" in case of a trigger.
char* expanded = static_cast<char*>(aX);
// Simulate what sqlite_trace was doing.
if (!::strncmp(expanded, "--", 2)) {
MOZ_LOG(gStorageLog, LogLevel::Debug,
("TRACE_STMT on %p: '%s'", aClosure, expanded));
} else {
char* sql = ::sqlite3_expanded_sql(stmt);
MOZ_LOG(gStorageLog, LogLevel::Debug,
("TRACE_STMT on %p: '%s'", aClosure, sql));
::sqlite3_free(sql);
}
break;
}
case SQLITE_TRACE_PROFILE: {
// aX is pointer to a 64bit integer containing nanoseconds it took to
// execute the last command.
sqlite_int64 time = *(static_cast<sqlite_int64*>(aX)) / 1000000;
if (time > 0) {
MOZ_LOG(gStorageLog, LogLevel::Debug,
("TRACE_TIME on %p: %lldms", aClosure, time));
}
break;
}
}
return 0;
}
void
basicFunctionHelper(sqlite3_context *aCtx,
int aArgc,
sqlite3_value **aArgv)
{
void *userData = ::sqlite3_user_data(aCtx);
mozIStorageFunction *func = static_cast<mozIStorageFunction *>(userData);
RefPtr<ArgValueArray> arguments(new ArgValueArray(aArgc, aArgv));
if (!arguments)
return;
nsCOMPtr<nsIVariant> result;
nsresult rv = func->OnFunctionCall(arguments, getter_AddRefs(result));
if (NS_FAILED(rv)) {
nsAutoCString errorMessage;
GetErrorName(rv, errorMessage);
errorMessage.InsertLiteral("User function returned ", 0);
errorMessage.Append('!');
NS_WARNING(errorMessage.get());
::sqlite3_result_error(aCtx, errorMessage.get(), -1);
::sqlite3_result_error_code(aCtx, nsresultToSQLiteResult(rv));
return;
}
int retcode = variantToSQLiteT(aCtx, result);
if (retcode == SQLITE_IGNORE) {
::sqlite3_result_int(aCtx, SQLITE_IGNORE);
} else if (retcode != SQLITE_OK) {
NS_WARNING("User function returned invalid data type!");
::sqlite3_result_error(aCtx,
"User function returned invalid data type",
-1);
}
}
void
aggregateFunctionStepHelper(sqlite3_context *aCtx,
int aArgc,
sqlite3_value **aArgv)
{
void *userData = ::sqlite3_user_data(aCtx);
mozIStorageAggregateFunction *func =
static_cast<mozIStorageAggregateFunction *>(userData);
RefPtr<ArgValueArray> arguments(new ArgValueArray(aArgc, aArgv));
if (!arguments)
return;
if (NS_FAILED(func->OnStep(arguments)))
NS_WARNING("User aggregate step function returned error code!");
}
void
aggregateFunctionFinalHelper(sqlite3_context *aCtx)
{
void *userData = ::sqlite3_user_data(aCtx);
mozIStorageAggregateFunction *func =
static_cast<mozIStorageAggregateFunction *>(userData);
RefPtr<nsIVariant> result;
if (NS_FAILED(func->OnFinal(getter_AddRefs(result)))) {
NS_WARNING("User aggregate final function returned error code!");
::sqlite3_result_error(aCtx,
"User aggregate final function returned error code",
-1);
return;
}
if (variantToSQLiteT(aCtx, result) != SQLITE_OK) {
NS_WARNING("User aggregate final function returned invalid data type!");
::sqlite3_result_error(aCtx,
"User aggregate final function returned invalid data type",
-1);
}
}
/**
* This code is heavily based on the sample at:
* http://www.sqlite.org/unlock_notify.html
*/
class UnlockNotification
{
public:
UnlockNotification()
: mMutex("UnlockNotification mMutex")
, mCondVar(mMutex, "UnlockNotification condVar")
, mSignaled(false)
{
}
void Wait()
{
MutexAutoLock lock(mMutex);
while (!mSignaled) {
(void)mCondVar.Wait();
}
}
void Signal()
{
MutexAutoLock lock(mMutex);
mSignaled = true;
(void)mCondVar.Notify();
}
private:
Mutex mMutex;
CondVar mCondVar;
bool mSignaled;
};
void
UnlockNotifyCallback(void **aArgs,
int aArgsSize)
{
for (int i = 0; i < aArgsSize; i++) {
UnlockNotification *notification =
static_cast<UnlockNotification *>(aArgs[i]);
notification->Signal();
}
}
int
WaitForUnlockNotify(sqlite3* aDatabase)
{
UnlockNotification notification;
int srv = ::sqlite3_unlock_notify(aDatabase, UnlockNotifyCallback,
&notification);
MOZ_ASSERT(srv == SQLITE_LOCKED || srv == SQLITE_OK);
if (srv == SQLITE_OK) {
notification.Wait();
}
return srv;
}
////////////////////////////////////////////////////////////////////////////////
//// Local Classes
class AsyncCloseConnection final: public Runnable
{
public:
AsyncCloseConnection(Connection *aConnection,
sqlite3 *aNativeConnection,
nsIRunnable *aCallbackEvent)
: Runnable("storage::AsyncCloseConnection")
, mConnection(aConnection)
, mNativeConnection(aNativeConnection)
, mCallbackEvent(aCallbackEvent)
{
}
NS_IMETHOD Run() override
{
// This code is executed on the background thread
MOZ_ASSERT(NS_GetCurrentThread() != mConnection->threadOpenedOn);
nsCOMPtr<nsIRunnable> event =
NewRunnableMethod("storage::Connection::shutdownAsyncThread",
mConnection, &Connection::shutdownAsyncThread);
MOZ_ALWAYS_SUCCEEDS(NS_DispatchToMainThread(event));
// Internal close.
(void)mConnection->internalClose(mNativeConnection);
// Callback
if (mCallbackEvent) {
nsCOMPtr<nsIThread> thread;
(void)NS_GetMainThread(getter_AddRefs(thread));
(void)thread->Dispatch(mCallbackEvent, NS_DISPATCH_NORMAL);
}
return NS_OK;
}
~AsyncCloseConnection() override {
NS_ReleaseOnMainThreadSystemGroup(
"AsyncCloseConnection::mConnection", mConnection.forget());
NS_ReleaseOnMainThreadSystemGroup(
"AsyncCloseConnection::mCallbackEvent", mCallbackEvent.forget());
}
private:
RefPtr<Connection> mConnection;
sqlite3 *mNativeConnection;
nsCOMPtr<nsIRunnable> mCallbackEvent;
};
/**
* An event used to initialize the clone of a connection.
*
* Must be executed on the clone's async execution thread.
*/
class AsyncInitializeClone final: public Runnable
{
public:
/**
* @param aConnection The connection being cloned.
* @param aClone The clone.
* @param aReadOnly If |true|, the clone is read only.
* @param aCallback A callback to trigger once initialization
* is complete. This event will be called on
* aClone->threadOpenedOn.
*/
AsyncInitializeClone(Connection* aConnection,
Connection* aClone,
const bool aReadOnly,
mozIStorageCompletionCallback* aCallback)
: Runnable("storage::AsyncInitializeClone")
, mConnection(aConnection)
, mClone(aClone)
, mReadOnly(aReadOnly)
, mCallback(aCallback)
{
MOZ_ASSERT(NS_IsMainThread());
}
NS_IMETHOD Run() override {
MOZ_ASSERT(!NS_IsMainThread());
nsresult rv = mConnection->initializeClone(mClone, mReadOnly);
if (NS_FAILED(rv)) {
return Dispatch(rv, nullptr);
}
return Dispatch(NS_OK,
NS_ISUPPORTS_CAST(mozIStorageAsyncConnection*, mClone));
}
private:
nsresult Dispatch(nsresult aResult, nsISupports* aValue) {
RefPtr<CallbackComplete> event = new CallbackComplete(aResult,
aValue,
mCallback.forget());
return mClone->threadOpenedOn->Dispatch(event, NS_DISPATCH_NORMAL);
}
~AsyncInitializeClone() override {
nsCOMPtr<nsIThread> thread;
DebugOnly<nsresult> rv = NS_GetMainThread(getter_AddRefs(thread));
MOZ_ASSERT(NS_SUCCEEDED(rv));
// Handle ambiguous nsISupports inheritance.
NS_ProxyRelease(
"AsyncInitializeClone::mConnection", thread, mConnection.forget());
NS_ProxyRelease(
"AsyncInitializeClone::mClone", thread, mClone.forget());
// Generally, the callback will be released by CallbackComplete.
// However, if for some reason Run() is not executed, we still
// need to ensure that it is released here.
NS_ProxyRelease(
"AsyncInitializeClone::mCallback", thread, mCallback.forget());
}
RefPtr<Connection> mConnection;
RefPtr<Connection> mClone;
const bool mReadOnly;
nsCOMPtr<mozIStorageCompletionCallback> mCallback;
};
/**
* A listener for async connection closing.
*/
class CloseListener final : public mozIStorageCompletionCallback
{
public:
NS_DECL_ISUPPORTS
CloseListener()
: mClosed(false)
{
}
NS_IMETHOD Complete(nsresult, nsISupports*) override
{
mClosed = true;
return NS_OK;
}
bool mClosed;
private:
~CloseListener() = default;
};
NS_IMPL_ISUPPORTS(CloseListener, mozIStorageCompletionCallback)
} // namespace
////////////////////////////////////////////////////////////////////////////////
//// Connection
Connection::Connection(Service *aService,
int aFlags,
bool aAsyncOnly,
bool aIgnoreLockingMode)
: sharedAsyncExecutionMutex("Connection::sharedAsyncExecutionMutex")
, sharedDBMutex("Connection::sharedDBMutex")
, threadOpenedOn(do_GetCurrentThread())
, mDBConn(nullptr)
, mAsyncExecutionThreadShuttingDown(false)
, mConnectionClosed(false)
, mTransactionInProgress(false)
, mProgressHandler(nullptr)
, mFlags(aFlags)
, mIgnoreLockingMode(aIgnoreLockingMode)
, mStorageService(aService)
, mAsyncOnly(aAsyncOnly)
{
MOZ_ASSERT(!mIgnoreLockingMode || mFlags & SQLITE_OPEN_READONLY,
"Can't ignore locking for a non-readonly connection!");
mStorageService->registerConnection(this);
}
Connection::~Connection()
{
// Failsafe Close() occurs in our custom Release method because of
// complications related to Close() potentially invoking AsyncClose() which
// will increment our refcount.
MOZ_ASSERT(!mAsyncExecutionThread,
"The async thread has not been shutdown properly!");
}
NS_IMPL_ADDREF(Connection)
NS_INTERFACE_MAP_BEGIN(Connection)
NS_INTERFACE_MAP_ENTRY(mozIStorageAsyncConnection)
NS_INTERFACE_MAP_ENTRY(nsIInterfaceRequestor)
NS_INTERFACE_MAP_ENTRY_CONDITIONAL(mozIStorageConnection, !mAsyncOnly)
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, mozIStorageConnection)
NS_INTERFACE_MAP_END
// This is identical to what NS_IMPL_RELEASE provides, but with the
// extra |1 == count| case.
NS_IMETHODIMP_(MozExternalRefCountType) Connection::Release(void)
{
NS_PRECONDITION(0 != mRefCnt, "dup release");
nsrefcnt count = --mRefCnt;
NS_LOG_RELEASE(this, count, "Connection");
if (1 == count) {
// If the refcount is 1, the single reference must be from
// gService->mConnections (in class |Service|). Which means we can
// perform our failsafe Close() and unregister...
//
// HOWEVER, there is an edge-case where our failsafe Close() may trigger
// a call to AsyncClose() which obtains a strong reference. This reference
// will be released via NS_ReleaseOnMainThreadSystemGroup() before Close()
// returns, which can potentially result in reentrancy into this method and
// this branch a second time. (It may also be deferred if we're not in
// that event target ourselves.) To avoid reentrancy madness, we explicitly
// bump our refcount up to 2 without going through AddRef().
++mRefCnt;
// Okay, now our refcount is 2, we trigger Close().
Unused << Close();
// Now our refcount should either be at 2 (because nothing happened, or the
// addref and release pair happened due to SpinningSynchronousClose) or
// 3 (because SpinningSynchronousClose happened but didn't release yet).
//
// We *really* want to avoid re-entrancy, and we have potentially two strong
// references remaining that will invoke Release() and potentially trigger
// a transition to 1 again. Since the second reference would be just a
// proxy release of an already-closed connection, it's not a big deal for us
// to unregister the connection now. We do need to take care to avoid a
// strong refcount transition to 1 from 2 because that would induce
// reentrancy. Note that we do not have any concerns about other threads
// being involved here; we MUST be the main thread if AsyncClose() is
// involved.
//
// Note: While Close() potentially spins the nested event loop, it is
// conceivable that Service::CollectReports or Service::minimizeMemory might
// be invoked. These call Service::getConnections() and will perform
// matching AddRef and Release calls but will definitely not retain any
// references. (Because connectionReady() will return false so both loops
// will immediately "continue" to bypass the connection in question.)
// Because our refcount is at least 2 at the lowest point, these do not pose
// a problem.
if (mRefCnt == 3) {
// pending proxy release, strong release to 2
mStorageService->unregisterConnection(this);
// now weak release to 1, the outstanding refcount will strong release to
// 0 and result in destruction later.
--mRefCnt;
} else if (mRefCnt == 2) {
// weak release to 1
--mRefCnt;
// strong release to 0, destruction will happen, we must NOT touch
// `this` after this point.
mStorageService->unregisterConnection(this);
} else {
MOZ_ASSERT(false, "Connection refcount invariant violated.");
}
} else if (0 == count) {
mRefCnt = 1; /* stabilize */
#if 0 /* enable this to find non-threadsafe destructors: */
NS_ASSERT_OWNINGTHREAD(Connection);
#endif
delete (this);
return 0;
}
return count;
}
int32_t
Connection::getSqliteRuntimeStatus(int32_t aStatusOption, int32_t* aMaxValue)
{
MOZ_ASSERT(mDBConn, "A connection must exist at this point");
int curr = 0, max = 0;
DebugOnly<int> rc = ::sqlite3_db_status(mDBConn, aStatusOption, &curr, &max, 0);
MOZ_ASSERT(NS_SUCCEEDED(convertResultCode(rc)));
if (aMaxValue)
*aMaxValue = max;
return curr;
}
nsIEventTarget *
Connection::getAsyncExecutionTarget()
{
NS_ENSURE_TRUE(threadOpenedOn == NS_GetCurrentThread(), nullptr);
// Don't return the asynchronous thread if we are shutting down.
if (mAsyncExecutionThreadShuttingDown) {
return nullptr;
}
// Create the async thread if there's none yet.
if (!mAsyncExecutionThread) {
static nsThreadPoolNaming naming;
nsresult rv = NS_NewNamedThread(naming.GetNextThreadName("mozStorage"),
getter_AddRefs(mAsyncExecutionThread));
if (NS_FAILED(rv)) {
NS_WARNING("Failed to create async thread.");
return nullptr;
}
}
return mAsyncExecutionThread;
}
nsresult
Connection::initialize()
{
NS_ASSERTION (!mDBConn, "Initialize called on already opened database!");
MOZ_ASSERT(!mIgnoreLockingMode, "Can't ignore locking on an in-memory db.");
AUTO_PROFILER_LABEL("Connection::initialize", STORAGE);
// in memory database requested, sqlite uses a magic file name
int srv = ::sqlite3_open_v2(":memory:", &mDBConn, mFlags, GetVFSName());
if (srv != SQLITE_OK) {
mDBConn = nullptr;
return convertResultCode(srv);
}
// Do not set mDatabaseFile or mFileURL here since this is a "memory"
// database.
nsresult rv = initializeInternal();
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
nsresult
Connection::initialize(nsIFile *aDatabaseFile)
{
NS_ASSERTION (aDatabaseFile, "Passed null file!");
NS_ASSERTION (!mDBConn, "Initialize called on already opened database!");
AUTO_PROFILER_LABEL("Connection::initialize", STORAGE);
mDatabaseFile = aDatabaseFile;
nsAutoString path;
nsresult rv = aDatabaseFile->GetPath(path);
NS_ENSURE_SUCCESS(rv, rv);
#ifdef XP_WIN
static const char* sIgnoreLockingVFS = "win32-none";
#else
static const char* sIgnoreLockingVFS = "unix-none";
#endif
const char* vfs = mIgnoreLockingMode ? sIgnoreLockingVFS : GetVFSName();
int srv = ::sqlite3_open_v2(NS_ConvertUTF16toUTF8(path).get(), &mDBConn,
mFlags, vfs);
if (srv != SQLITE_OK) {
mDBConn = nullptr;
return convertResultCode(srv);
}
// Do not set mFileURL here since this is database does not have an associated
// URL.
mDatabaseFile = aDatabaseFile;
rv = initializeInternal();
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
nsresult
Connection::initialize(nsIFileURL *aFileURL)
{
NS_ASSERTION (aFileURL, "Passed null file URL!");
NS_ASSERTION (!mDBConn, "Initialize called on already opened database!");
AUTO_PROFILER_LABEL("Connection::initialize", STORAGE);
nsCOMPtr<nsIFile> databaseFile;
nsresult rv = aFileURL->GetFile(getter_AddRefs(databaseFile));
NS_ENSURE_SUCCESS(rv, rv);
nsAutoCString spec;
rv = aFileURL->GetSpec(spec);
NS_ENSURE_SUCCESS(rv, rv);
int srv = ::sqlite3_open_v2(spec.get(), &mDBConn, mFlags, GetVFSName());
if (srv != SQLITE_OK) {
mDBConn = nullptr;
return convertResultCode(srv);
}
// Set both mDatabaseFile and mFileURL here.
mFileURL = aFileURL;
mDatabaseFile = databaseFile;
rv = initializeInternal();
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
nsresult
Connection::initializeInternal()
{
MOZ_ASSERT(mDBConn);
auto guard = MakeScopeExit([&]() {
{
MutexAutoLock lockedScope(sharedAsyncExecutionMutex);
mConnectionClosed = true;
}
MOZ_ALWAYS_TRUE(::sqlite3_close(mDBConn) == SQLITE_OK);
mDBConn = nullptr;
sharedDBMutex.destroy();
});
if (mFileURL) {
const char* dbPath = ::sqlite3_db_filename(mDBConn, "main");
MOZ_ASSERT(dbPath);
const char* telemetryFilename =
::sqlite3_uri_parameter(dbPath, "telemetryFilename");
if (telemetryFilename) {
if (NS_WARN_IF(*telemetryFilename == '\0')) {
return NS_ERROR_INVALID_ARG;
}
mTelemetryFilename = telemetryFilename;
}
}
if (mTelemetryFilename.IsEmpty()) {
mTelemetryFilename = getFilename();
MOZ_ASSERT(!mTelemetryFilename.IsEmpty());
}
// Properly wrap the database handle's mutex.
sharedDBMutex.initWithMutex(sqlite3_db_mutex(mDBConn));
// SQLite tracing can slow down queries (especially long queries)
// significantly. Don't trace unless the user is actively monitoring SQLite.
if (MOZ_LOG_TEST(gStorageLog, LogLevel::Debug)) {
::sqlite3_trace_v2(mDBConn,
SQLITE_TRACE_STMT | SQLITE_TRACE_PROFILE,
tracefunc, this);
MOZ_LOG(gStorageLog, LogLevel::Debug, ("Opening connection to '%s' (%p)",
mTelemetryFilename.get(), this));
}
int64_t pageSize = Service::getDefaultPageSize();
// Set page_size to the preferred default value. This is effective only if
// the database has just been created, otherwise, if the database does not
// use WAL journal mode, a VACUUM operation will updated its page_size.
nsAutoCString pageSizeQuery(MOZ_STORAGE_UNIQUIFY_QUERY_STR
"PRAGMA page_size = ");
pageSizeQuery.AppendInt(pageSize);
int srv = executeSql(mDBConn, pageSizeQuery.get());
if (srv != SQLITE_OK) {
return convertResultCode(srv);
}
// Setting the cache_size forces the database open, verifying if it is valid
// or corrupt. So this is executed regardless it being actually needed.
// The cache_size is calculated from the actual page_size, to save memory.
nsAutoCString cacheSizeQuery(MOZ_STORAGE_UNIQUIFY_QUERY_STR
"PRAGMA cache_size = ");
cacheSizeQuery.AppendInt(-MAX_CACHE_SIZE_KIBIBYTES);
srv = executeSql(mDBConn, cacheSizeQuery.get());
if (srv != SQLITE_OK) {
return convertResultCode(srv);
}
#if defined(MOZ_MEMORY_TEMP_STORE_PRAGMA)
(void)ExecuteSimpleSQL(NS_LITERAL_CSTRING("PRAGMA temp_store = 2;"));
#endif
// Register our built-in SQL functions.
srv = registerFunctions(mDBConn);
if (srv != SQLITE_OK) {
return convertResultCode(srv);
}
// Register our built-in SQL collating sequences.
srv = registerCollations(mDBConn, mStorageService);
if (srv != SQLITE_OK) {
return convertResultCode(srv);
}
// Set the synchronous PRAGMA, according to the preference.
switch (Service::getSynchronousPref()) {
case 2:
(void)ExecuteSimpleSQL(NS_LITERAL_CSTRING(
"PRAGMA synchronous = FULL;"));
break;
case 0:
(void)ExecuteSimpleSQL(NS_LITERAL_CSTRING(
"PRAGMA synchronous = OFF;"));
break;
case 1:
default:
(void)ExecuteSimpleSQL(NS_LITERAL_CSTRING(
"PRAGMA synchronous = NORMAL;"));
break;
}
// Initialization succeeded, we can stop guarding for failures.
guard.release();
return NS_OK;
}
nsresult
Connection::initializeOnAsyncThread(nsIFile* aStorageFile) {
MOZ_ASSERT(threadOpenedOn != NS_GetCurrentThread());
nsresult rv = aStorageFile ? initialize(aStorageFile)
: initialize();
if (NS_FAILED(rv)) {
// Shutdown the async thread, since initialization failed.
MutexAutoLock lockedScope(sharedAsyncExecutionMutex);
mAsyncExecutionThreadShuttingDown = true;
nsCOMPtr<nsIRunnable> event =
NewRunnableMethod("Connection::shutdownAsyncThread",
this, &Connection::shutdownAsyncThread);
Unused << NS_DispatchToMainThread(event);
}
return rv;
}
nsresult
Connection::databaseElementExists(enum DatabaseElementType aElementType,
const nsACString &aElementName,
bool *_exists)
{
if (!mDBConn) return NS_ERROR_NOT_INITIALIZED;
// When constructing the query, make sure to SELECT the correct db's sqlite_master
// if the user is prefixing the element with a specific db. ex: sample.test
nsCString query("SELECT name FROM (SELECT * FROM ");
nsDependentCSubstring element;
int32_t ind = aElementName.FindChar('.');
if (ind == kNotFound) {
element.Assign(aElementName);
}
else {
nsDependentCSubstring db(Substring(aElementName, 0, ind + 1));
element.Assign(Substring(aElementName, ind + 1, aElementName.Length()));
query.Append(db);
}
query.AppendLiteral("sqlite_master UNION ALL SELECT * FROM sqlite_temp_master) WHERE type = '");
switch (aElementType) {
case INDEX:
query.AppendLiteral("index");
break;
case TABLE:
query.AppendLiteral("table");
break;
}
query.AppendLiteral("' AND name ='");
query.Append(element);
query.Append('\'');
sqlite3_stmt *stmt;
int srv = prepareStatement(mDBConn, query, &stmt);
if (srv != SQLITE_OK)
return convertResultCode(srv);
srv = stepStatement(mDBConn, stmt);
// we just care about the return value from step
(void)::sqlite3_finalize(stmt);
if (srv == SQLITE_ROW) {
*_exists = true;
return NS_OK;
}
if (srv == SQLITE_DONE) {
*_exists = false;
return NS_OK;
}
return convertResultCode(srv);
}
bool
Connection::findFunctionByInstance(nsISupports *aInstance)
{
sharedDBMutex.assertCurrentThreadOwns();
for (auto iter = mFunctions.Iter(); !iter.Done(); iter.Next()) {
if (iter.UserData().function == aInstance) {
return true;
}
}
return false;
}
/* static */ int
Connection::sProgressHelper(void *aArg)
{
Connection *_this = static_cast<Connection *>(aArg);
return _this->progressHandler();
}
int
Connection::progressHandler()
{
sharedDBMutex.assertCurrentThreadOwns();
if (mProgressHandler) {
bool result;
nsresult rv = mProgressHandler->OnProgress(this, &result);
if (NS_FAILED(rv)) return 0; // Don't break request
return result ? 1 : 0;
}
return 0;
}
nsresult
Connection::setClosedState()
{
// Ensure that we are on the correct thread to close the database.
bool onOpenedThread;
nsresult rv = threadOpenedOn->IsOnCurrentThread(&onOpenedThread);
NS_ENSURE_SUCCESS(rv, rv);
if (!onOpenedThread) {
NS_ERROR("Must close the database on the thread that you opened it with!");
return NS_ERROR_UNEXPECTED;
}
// Flag that we are shutting down the async thread, so that
// getAsyncExecutionTarget knows not to expose/create the async thread.
{
MutexAutoLock lockedScope(sharedAsyncExecutionMutex);
NS_ENSURE_FALSE(mAsyncExecutionThreadShuttingDown, NS_ERROR_UNEXPECTED);
mAsyncExecutionThreadShuttingDown = true;
// Set the property to null before closing the connection, otherwise the other
// functions in the module may try to use the connection after it is closed.
mDBConn = nullptr;
}
return NS_OK;
}
bool
Connection::connectionReady()
{
return mDBConn != nullptr;
}
bool
Connection::isConnectionReadyOnThisThread()
{
MOZ_ASSERT_IF(mDBConn, !mConnectionClosed);
if (mAsyncExecutionThread &&
mAsyncExecutionThread->IsOnCurrentThread()) {
return true;
}
return connectionReady();
}
bool
Connection::isClosing()
{
MutexAutoLock lockedScope(sharedAsyncExecutionMutex);
return mAsyncExecutionThreadShuttingDown && !mConnectionClosed;
}
bool
Connection::isClosed()
{
MutexAutoLock lockedScope(sharedAsyncExecutionMutex);
return mConnectionClosed;
}
bool
Connection::isClosed(MutexAutoLock& lock)
{
return mConnectionClosed;
}
bool
Connection::isAsyncExecutionThreadAvailable()
{
MOZ_ASSERT(threadOpenedOn == NS_GetCurrentThread());
return mAsyncExecutionThread && !mAsyncExecutionThreadShuttingDown;
}
void
Connection::shutdownAsyncThread() {
MOZ_ASSERT(threadOpenedOn == NS_GetCurrentThread());
MOZ_ASSERT(mAsyncExecutionThread);
MOZ_ASSERT(mAsyncExecutionThreadShuttingDown);
MOZ_ALWAYS_SUCCEEDS(mAsyncExecutionThread->Shutdown());
mAsyncExecutionThread = nullptr;
}
nsresult
Connection::internalClose(sqlite3 *aNativeConnection)
{
#ifdef DEBUG
{ // Make sure we have marked our async thread as shutting down.
MutexAutoLock lockedScope(sharedAsyncExecutionMutex);
MOZ_ASSERT(mAsyncExecutionThreadShuttingDown,
"Did not call setClosedState!");
MOZ_ASSERT(!isClosed(lockedScope), "Unexpected closed state");
}
#endif // DEBUG
if (MOZ_LOG_TEST(gStorageLog, LogLevel::Debug)) {
nsAutoCString leafName(":memory");
if (mDatabaseFile)
(void)mDatabaseFile->GetNativeLeafName(leafName);
MOZ_LOG(gStorageLog, LogLevel::Debug, ("Closing connection to '%s'",
leafName.get()));
}
// At this stage, we may still have statements that need to be
// finalized. Attempt to close the database connection. This will
// always disconnect any virtual tables and cleanly finalize their
// internal statements. Once this is done, closing may fail due to
// unfinalized client statements, in which case we need to finalize
// these statements and close again.
{
MutexAutoLock lockedScope(sharedAsyncExecutionMutex);
mConnectionClosed = true;
}
// Nothing else needs to be done if we don't have a connection here.
if (!aNativeConnection)
return NS_OK;
int srv = ::sqlite3_close(aNativeConnection);
if (srv == SQLITE_BUSY) {
{
// Nothing else should change the connection or statements status until we
// are done here.
SQLiteMutexAutoLock lockedScope(sharedDBMutex);
// We still have non-finalized statements. Finalize them.
sqlite3_stmt *stmt = nullptr;
while ((stmt = ::sqlite3_next_stmt(aNativeConnection, stmt))) {
MOZ_LOG(gStorageLog, LogLevel::Debug,
("Auto-finalizing SQL statement '%s' (%p)",
::sqlite3_sql(stmt),
stmt));
#ifdef DEBUG
SmprintfPointer msg = ::mozilla::Smprintf("SQL statement '%s' (%p) should have been finalized before closing the connection",
::sqlite3_sql(stmt),
stmt);
NS_WARNING(msg.get());
#endif // DEBUG
srv = ::sqlite3_finalize(stmt);
#ifdef DEBUG
if (srv != SQLITE_OK) {
SmprintfPointer msg = ::mozilla::Smprintf("Could not finalize SQL statement (%p)",
stmt);
NS_WARNING(msg.get());
}
#endif // DEBUG
// Ensure that the loop continues properly, whether closing has succeeded
// or not.
if (srv == SQLITE_OK) {
stmt = nullptr;
}
}
// Scope exiting will unlock the mutex before we invoke sqlite3_close()
// again, since Sqlite will try to acquire it.
}
// Now that all statements have been finalized, we
// should be able to close.
srv = ::sqlite3_close(aNativeConnection);
MOZ_ASSERT(false, "Had to forcibly close the database connection because not all the statements have been finalized.");
}
if (srv == SQLITE_OK) {
sharedDBMutex.destroy();
} else {
MOZ_ASSERT(false,
"sqlite3_close failed. There are probably outstanding statements that are listed above!");
}
return convertResultCode(srv);
}
nsCString
Connection::getFilename()
{
nsCString leafname(":memory:");
if (mDatabaseFile) {
(void)mDatabaseFile->GetNativeLeafName(leafname);
}
return leafname;
}
int
Connection::stepStatement(sqlite3 *aNativeConnection, sqlite3_stmt *aStatement)
{
MOZ_ASSERT(aStatement);
bool checkedMainThread = false;
TimeStamp startTime = TimeStamp::Now();
// The connection may have been closed if the executing statement has been
// created and cached after a call to asyncClose() but before the actual
// sqlite3_close(). This usually happens when other tasks using cached
// statements are asynchronously scheduled for execution and any of them ends
// up after asyncClose. See bug 728653 for details.
if (!isConnectionReadyOnThisThread())
return SQLITE_MISUSE;
(void)::sqlite3_extended_result_codes(aNativeConnection, 1);
int srv;
while ((srv = ::sqlite3_step(aStatement)) == SQLITE_LOCKED_SHAREDCACHE) {
if (!checkedMainThread) {
checkedMainThread = true;
if (::NS_IsMainThread()) {
NS_WARNING("We won't allow blocking on the main thread!");
break;
}
}
srv = WaitForUnlockNotify(aNativeConnection);
if (srv != SQLITE_OK) {
break;
}
::sqlite3_reset(aStatement);
}
// Report very slow SQL statements to Telemetry
TimeDuration duration = TimeStamp::Now() - startTime;
const uint32_t threshold =
NS_IsMainThread() ? Telemetry::kSlowSQLThresholdForMainThread
: Telemetry::kSlowSQLThresholdForHelperThreads;
if (duration.ToMilliseconds() >= threshold) {
nsDependentCString statementString(::sqlite3_sql(aStatement));
Telemetry::RecordSlowSQLStatement(statementString, mTelemetryFilename,
duration.ToMilliseconds());
}
(void)::sqlite3_extended_result_codes(aNativeConnection, 0);
// Drop off the extended result bits of the result code.
return srv & 0xFF;
}
int
Connection::prepareStatement(sqlite3 *aNativeConnection, const nsCString &aSQL,
sqlite3_stmt **_stmt)
{
// We should not even try to prepare statements after the connection has
// been closed.
if (!isConnectionReadyOnThisThread())
return SQLITE_MISUSE;
bool checkedMainThread = false;
(void)::sqlite3_extended_result_codes(aNativeConnection, 1);
int srv;
while((srv = ::sqlite3_prepare_v2(aNativeConnection,
aSQL.get(),
-1,
_stmt,
nullptr)) == SQLITE_LOCKED_SHAREDCACHE) {
if (!checkedMainThread) {
checkedMainThread = true;
if (::NS_IsMainThread()) {
NS_WARNING("We won't allow blocking on the main thread!");
break;
}
}
srv = WaitForUnlockNotify(aNativeConnection);
if (srv != SQLITE_OK) {
break;
}
}
if (srv != SQLITE_OK) {
nsCString warnMsg;
warnMsg.AppendLiteral("The SQL statement '");
warnMsg.Append(aSQL);
warnMsg.AppendLiteral("' could not be compiled due to an error: ");
warnMsg.Append(::sqlite3_errmsg(aNativeConnection));
#ifdef DEBUG
NS_WARNING(warnMsg.get());
#endif
MOZ_LOG(gStorageLog, LogLevel::Error, ("%s", warnMsg.get()));
}
(void)::sqlite3_extended_result_codes(aNativeConnection, 0);
// Drop off the extended result bits of the result code.
int rc = srv & 0xFF;
// sqlite will return OK on a comment only string and set _stmt to nullptr.
// The callers of this function are used to only checking the return value,
// so it is safer to return an error code.
if (rc == SQLITE_OK && *_stmt == nullptr) {
return SQLITE_MISUSE;
}
return rc;
}
int
Connection::executeSql(sqlite3 *aNativeConnection, const char *aSqlString)
{
if (!isConnectionReadyOnThisThread())
return SQLITE_MISUSE;
TimeStamp startTime = TimeStamp::Now();
int srv = ::sqlite3_exec(aNativeConnection, aSqlString, nullptr, nullptr,
nullptr);
// Report very slow SQL statements to Telemetry
TimeDuration duration = TimeStamp::Now() - startTime;
const uint32_t threshold =
NS_IsMainThread() ? Telemetry::kSlowSQLThresholdForMainThread
: Telemetry::kSlowSQLThresholdForHelperThreads;
if (duration.ToMilliseconds() >= threshold) {
nsDependentCString statementString(aSqlString);
Telemetry::RecordSlowSQLStatement(statementString, mTelemetryFilename,
duration.ToMilliseconds());
}
return srv;
}
////////////////////////////////////////////////////////////////////////////////
//// nsIInterfaceRequestor
NS_IMETHODIMP
Connection::GetInterface(const nsIID &aIID,
void **_result)
{
if (aIID.Equals(NS_GET_IID(nsIEventTarget))) {
nsIEventTarget *background = getAsyncExecutionTarget();
NS_IF_ADDREF(background);
*_result = background;
return NS_OK;
}
return NS_ERROR_NO_INTERFACE;
}
////////////////////////////////////////////////////////////////////////////////
//// mozIStorageConnection
NS_IMETHODIMP
Connection::Close()
{
if (!mDBConn)
return NS_ERROR_NOT_INITIALIZED;
#ifdef DEBUG
// Since we're accessing mAsyncExecutionThread, we need to be on the opener thread.
// We make this check outside of debug code below in setClosedState, but this is
// here to be explicit.
bool onOpenerThread = false;
(void)threadOpenedOn->IsOnCurrentThread(&onOpenerThread);
MOZ_ASSERT(onOpenerThread);
#endif // DEBUG
// Make sure we have not executed any asynchronous statements.
// If this fails, the mDBConn may be left open, resulting in a leak.
// We'll try to finalize the pending statements and close the connection.
if (isAsyncExecutionThreadAvailable()) {
#ifdef DEBUG
if (NS_IsMainThread()) {
nsCOMPtr<nsIXPConnect> xpc = do_GetService(nsIXPConnect::GetCID());
Unused << xpc->DebugDumpJSStack(false, false, false);
}
#endif
MOZ_ASSERT(false,
"Close() was invoked on a connection that executed asynchronous statements. "
"Should have used asyncClose().");
// Try to close the database regardless, to free up resources.
Unused << SpinningSynchronousClose();
return NS_ERROR_UNEXPECTED;
}
// setClosedState nullifies our connection pointer, so we take a raw pointer
// off it, to pass it through the close procedure.
sqlite3 *nativeConn = mDBConn;
nsresult rv = setClosedState();
NS_ENSURE_SUCCESS(rv, rv);
return internalClose(nativeConn);
}
NS_IMETHODIMP
Connection::SpinningSynchronousClose()
{
if (threadOpenedOn != NS_GetCurrentThread()) {
return NS_ERROR_NOT_SAME_THREAD;
}
// As currently implemented, we can't spin to wait for an existing AsyncClose.
// Our only existing caller will never have called close; assert if misused
// so that no new callers assume this works after an AsyncClose.
MOZ_DIAGNOSTIC_ASSERT(connectionReady());
if (!connectionReady()) {
return NS_ERROR_UNEXPECTED;
}
RefPtr<CloseListener> listener = new CloseListener();
nsresult rv = AsyncClose(listener);
NS_ENSURE_SUCCESS(rv, rv);
MOZ_ALWAYS_TRUE(SpinEventLoopUntil([&]() {
return listener->mClosed;
}));
MOZ_ASSERT(isClosed(), "The connection should be closed at this point");
return rv;
}
NS_IMETHODIMP
Connection::AsyncClose(mozIStorageCompletionCallback *aCallback)
{
NS_ENSURE_TRUE(NS_IsMainThread(), NS_ERROR_NOT_SAME_THREAD);
// Check if AsyncClose or Close were already invoked.
if (!mDBConn) {
return NS_ERROR_NOT_INITIALIZED;
}
// The two relevant factors at this point are whether we have a database
// connection and whether we have an async execution thread. Here's what the
// states mean and how we handle them:
//
// - (mDBConn && asyncThread): The expected case where we are either an
// async connection or a sync connection that has been used asynchronously.
// Either way the caller must call us and not Close(). Nothing surprising
// about this. We'll dispatch AsyncCloseConnection to the already-existing
// async thread.
//
// - (mDBConn && !asyncThread): A somewhat unusual case where the caller
// opened the connection synchronously and was planning to use it
// asynchronously, but never got around to using it asynchronously before
// needing to shutdown. This has been observed to happen for the cookie
// service in a case where Firefox shuts itself down almost immediately
// after startup (for unknown reasons). In the Firefox shutdown case,
// we may also fail to create a new async execution thread if one does not
// already exist. (nsThreadManager will refuse to create new threads when
// it has already been told to shutdown.) As such, we need to handle a
// failure to create the async execution thread by falling back to
// synchronous Close() and also dispatching the completion callback because
// at least Places likes to spin a nested event loop that depends on the
// callback being invoked.
//
// Note that we have considered not trying to spin up the async execution
// thread in this case if it does not already exist, but the overhead of
// thread startup (if successful) is significantly less expensive than the
// worst-case potential I/O hit of synchronously closing a database when we
// could close it asynchronously.
//
// - (!mDBConn && asyncThread): This happens in some but not all cases where
// OpenAsyncDatabase encountered a problem opening the database. If it
// happened in all cases AsyncInitDatabase would just shut down the thread
// directly and we would avoid this case. But it doesn't, so for simplicity
// and consistency AsyncCloseConnection knows how to handle this and we
// act like this was the (mDBConn && asyncThread) case in this method.
//
// - (!mDBConn && !asyncThread): The database was never successfully opened or
// Close() or AsyncClose() has already been called (at least) once. This is
// undeniably a misuse case by the caller. We could optimize for this
// case by adding an additional check of mAsyncExecutionThread without using
// getAsyncExecutionTarget() to avoid wastefully creating a thread just to
// shut it down. But this complicates the method for broken caller code
// whereas we're still correct and safe without the special-case.
nsIEventTarget *asyncThread = getAsyncExecutionTarget();
// Create our callback event if we were given a callback. This will
// eventually be dispatched in all cases, even if we fall back to Close() and
// the database wasn't open and we return an error. The rationale is that
// no existing consumer checks our return value and several of them like to
// spin nested event loops until the callback fires. Given that, it seems
// preferable for us to dispatch the callback in all cases. (Except the
// wrong thread misuse case we bailed on up above. But that's okay because
// that is statically wrong whereas these edge cases are dynamic.)
nsCOMPtr<nsIRunnable> completeEvent;
if (aCallback) {
completeEvent = newCompletionEvent(aCallback);
}
if (!asyncThread) {
// We were unable to create an async thread, so we need to fall back to
// using normal Close(). Since there is no async thread, Close() will
// not complain about that. (Close() may, however, complain if the
// connection is closed, but that's okay.)
if (completeEvent) {
// Closing the database is more important than returning an error code
// about a failure to dispatch, especially because all existing native
// callers ignore our return value.
Unused << NS_DispatchToMainThread(completeEvent.forget());
}
MOZ_ALWAYS_SUCCEEDS(Close());
// Return a success inconditionally here, since Close() is unlikely to fail
// and we want to reassure the consumer that its callback will be invoked.
return NS_OK;
}
// setClosedState nullifies our connection pointer, so we take a raw pointer
// off it, to pass it through the close procedure.
sqlite3 *nativeConn = mDBConn;
nsresult rv = setClosedState();
NS_ENSURE_SUCCESS(rv, rv);
// Create and dispatch our close event to the background thread.
nsCOMPtr<nsIRunnable> closeEvent = new AsyncCloseConnection(this,
nativeConn,
completeEvent);
rv = asyncThread->Dispatch(closeEvent, NS_DISPATCH_NORMAL);
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
NS_IMETHODIMP
Connection::AsyncClone(bool aReadOnly,
mozIStorageCompletionCallback *aCallback)
{
AUTO_PROFILER_LABEL("Connection::AsyncClone", STORAGE);
NS_ENSURE_TRUE(NS_IsMainThread(), NS_ERROR_NOT_SAME_THREAD);
if (!mDBConn)
return NS_ERROR_NOT_INITIALIZED;
if (!mDatabaseFile)
return NS_ERROR_UNEXPECTED;
int flags = mFlags;
if (aReadOnly) {
// Turn off SQLITE_OPEN_READWRITE, and set SQLITE_OPEN_READONLY.
flags = (~SQLITE_OPEN_READWRITE & flags) | SQLITE_OPEN_READONLY;
// Turn off SQLITE_OPEN_CREATE.
flags = (~SQLITE_OPEN_CREATE & flags);
}
// Force the cloned connection to only implement the async connection API.
RefPtr<Connection> clone = new Connection(mStorageService, flags, true);
RefPtr<AsyncInitializeClone> initEvent =
new AsyncInitializeClone(this, clone, aReadOnly, aCallback);
// Dispatch to our async thread, since the originating connection must remain
// valid and open for the whole cloning process. This also ensures we are
// properly serialized with a `close` operation, rather than race with it.
nsCOMPtr<nsIEventTarget> target = getAsyncExecutionTarget();
if (!target) {
return NS_ERROR_UNEXPECTED;
}
return target->Dispatch(initEvent, NS_DISPATCH_NORMAL);
}
nsresult
Connection::initializeClone(Connection* aClone, bool aReadOnly)
{
nsresult rv = mFileURL ? aClone->initialize(mFileURL)
: aClone->initialize(mDatabaseFile);
if (NS_FAILED(rv)) {
return rv;
}
// Copy over temporary tables, triggers, and views from the original
// connections. Entities in `sqlite_temp_master` are only visible to the
// connection that created them.
if (!aReadOnly) {
nsCOMPtr<mozIStorageStatement> stmt;
rv = CreateStatement(NS_LITERAL_CSTRING("SELECT sql FROM sqlite_temp_master "
"WHERE type IN ('table', 'view', "
"'index', 'trigger')"),
getter_AddRefs(stmt));
// Propagate errors, because failing to copy triggers might cause schema
// coherency issues when writing to the database from the cloned connection.
NS_ENSURE_SUCCESS(rv, rv);
bool hasResult = false;
while (stmt && NS_SUCCEEDED(stmt->ExecuteStep(&hasResult)) && hasResult) {
nsAutoCString query;
rv = stmt->GetUTF8String(0, query);
NS_ENSURE_SUCCESS(rv, rv);
// The `CREATE` SQL statements in `sqlite_temp_master` omit the `TEMP`
// keyword. We need to add it back, or we'll recreate temporary entities
// as persistent ones. `sqlite_temp_master` also holds `CREATE INDEX`
// statements, but those don't need `TEMP` keywords.
if (StringBeginsWith(query, NS_LITERAL_CSTRING("CREATE TABLE ")) ||
StringBeginsWith(query, NS_LITERAL_CSTRING("CREATE TRIGGER ")) ||
StringBeginsWith(query, NS_LITERAL_CSTRING("CREATE VIEW "))) {
query.Replace(0, 6, "CREATE TEMP");
}
rv = aClone->ExecuteSimpleSQL(query);
NS_ENSURE_SUCCESS(rv, rv);
}
}
// Re-attach on-disk databases that were attached to the original connection.
{
nsCOMPtr<mozIStorageStatement> stmt;
rv = CreateStatement(NS_LITERAL_CSTRING("PRAGMA database_list"),
getter_AddRefs(stmt));
MOZ_ASSERT(NS_SUCCEEDED(rv));
bool hasResult = false;
while (stmt && NS_SUCCEEDED(stmt->ExecuteStep(&hasResult)) && hasResult) {
nsAutoCString name;
rv = stmt->GetUTF8String(1, name);
if (NS_SUCCEEDED(rv) && !name.EqualsLiteral("main") &&
!name.EqualsLiteral("temp")) {
nsCString path;
rv = stmt->GetUTF8String(2, path);
if (NS_SUCCEEDED(rv) && !path.IsEmpty()) {
nsCOMPtr<mozIStorageStatement> attachStmt;
rv = aClone->CreateStatement(
NS_LITERAL_CSTRING("ATTACH DATABASE :path AS ") + name,
getter_AddRefs(attachStmt));
MOZ_ASSERT(NS_SUCCEEDED(rv));
rv = attachStmt->BindUTF8StringByName(NS_LITERAL_CSTRING("path"),
path);
MOZ_ASSERT(NS_SUCCEEDED(rv));
rv = attachStmt->Execute();
MOZ_ASSERT(NS_SUCCEEDED(rv), "couldn't re-attach database to cloned connection");
}
}
}
}
// Copy over pragmas from the original connection.
// LIMITATION WARNING! Many of these pragmas are actually scoped to the
// schema ("main" and any other attached databases), and this implmentation
// fails to propagate them. This is being addressed on trunk.
static const char * pragmas[] = {
"cache_size",
"temp_store",
"foreign_keys",
"journal_size_limit",
"synchronous",
"wal_autocheckpoint",
"busy_timeout"
};
for (auto& pragma : pragmas) {
// Read-only connections just need cache_size and temp_store pragmas.
if (aReadOnly && ::strcmp(pragma, "cache_size") != 0 &&
::strcmp(pragma, "temp_store") != 0) {
continue;
}
nsAutoCString pragmaQuery("PRAGMA ");
pragmaQuery.Append(pragma);
nsCOMPtr<mozIStorageStatement> stmt;
rv = CreateStatement(pragmaQuery, getter_AddRefs(stmt));
MOZ_ASSERT(NS_SUCCEEDED(rv));
bool hasResult = false;
if (stmt && NS_SUCCEEDED(stmt->ExecuteStep(&hasResult)) && hasResult) {
pragmaQuery.AppendLiteral(" = ");
pragmaQuery.AppendInt(stmt->AsInt32(0));
rv = aClone->ExecuteSimpleSQL(pragmaQuery);
MOZ_ASSERT(NS_SUCCEEDED(rv));
}
}
// Copy any functions that have been added to this connection.
SQLiteMutexAutoLock lockedScope(sharedDBMutex);
for (auto iter = mFunctions.Iter(); !iter.Done(); iter.Next()) {
const nsACString &key = iter.Key();
Connection::FunctionInfo data = iter.UserData();
MOZ_ASSERT(data.type == Connection::FunctionInfo::SIMPLE ||
data.type == Connection::FunctionInfo::AGGREGATE,
"Invalid function type!");
if (data.type == Connection::FunctionInfo::SIMPLE) {
mozIStorageFunction *function =
static_cast<mozIStorageFunction *>(data.function.get());
rv = aClone->CreateFunction(key, data.numArgs, function);
if (NS_FAILED(rv)) {
NS_WARNING("Failed to copy function to cloned connection");
}
} else {
mozIStorageAggregateFunction *function =
static_cast<mozIStorageAggregateFunction *>(data.function.get());
rv = aClone->CreateAggregateFunction(key, data.numArgs, function);
if (NS_FAILED(rv)) {
NS_WARNING("Failed to copy aggregate function to cloned connection");
}
}
}
return NS_OK;
}
NS_IMETHODIMP
Connection::Clone(bool aReadOnly,
mozIStorageConnection **_connection)
{
MOZ_ASSERT(threadOpenedOn == NS_GetCurrentThread());
AUTO_PROFILER_LABEL("Connection::Clone", STORAGE);
if (!mDBConn)
return NS_ERROR_NOT_INITIALIZED;
if (!mDatabaseFile)
return NS_ERROR_UNEXPECTED;
int flags = mFlags;
if (aReadOnly) {
// Turn off SQLITE_OPEN_READWRITE, and set SQLITE_OPEN_READONLY.
flags = (~SQLITE_OPEN_READWRITE & flags) | SQLITE_OPEN_READONLY;
// Turn off SQLITE_OPEN_CREATE.
flags = (~SQLITE_OPEN_CREATE & flags);
}
RefPtr<Connection> clone = new Connection(mStorageService, flags, mAsyncOnly);
nsresult rv = initializeClone(clone, aReadOnly);
if (NS_FAILED(rv)) {
return rv;
}
NS_IF_ADDREF(*_connection = clone);
return NS_OK;
}
NS_IMETHODIMP
Connection::Interrupt()
{
MOZ_ASSERT(threadOpenedOn == NS_GetCurrentThread());
if (!mDBConn) {
return NS_ERROR_NOT_INITIALIZED;
}
if (!mAsyncOnly || !(mFlags & SQLITE_OPEN_READONLY)) {
return NS_ERROR_INVALID_ARG;
}
::sqlite3_interrupt(mDBConn);
return NS_OK;
}
NS_IMETHODIMP
Connection::GetDefaultPageSize(int32_t *_defaultPageSize)
{
*_defaultPageSize = Service::getDefaultPageSize();
return NS_OK;
}
NS_IMETHODIMP
Connection::GetConnectionReady(bool *_ready)
{
MOZ_ASSERT(threadOpenedOn == NS_GetCurrentThread());
*_ready = connectionReady();
return NS_OK;
}
NS_IMETHODIMP
Connection::GetDatabaseFile(nsIFile **_dbFile)
{
if (!mDBConn) return NS_ERROR_NOT_INITIALIZED;
NS_IF_ADDREF(*_dbFile = mDatabaseFile);
return NS_OK;
}
NS_IMETHODIMP
Connection::GetLastInsertRowID(int64_t *_id)
{
if (!mDBConn) return NS_ERROR_NOT_INITIALIZED;
sqlite_int64 id = ::sqlite3_last_insert_rowid(mDBConn);
*_id = id;
return NS_OK;
}
NS_IMETHODIMP
Connection::GetAffectedRows(int32_t *_rows)
{
if (!mDBConn) return NS_ERROR_NOT_INITIALIZED;
*_rows = ::sqlite3_changes(mDBConn);
return NS_OK;
}
NS_IMETHODIMP
Connection::GetLastError(int32_t *_error)
{
if (!mDBConn) return NS_ERROR_NOT_INITIALIZED;
*_error = ::sqlite3_errcode(mDBConn);
return NS_OK;
}
NS_IMETHODIMP
Connection::GetLastErrorString(nsACString &_errorString)
{
if (!mDBConn) return NS_ERROR_NOT_INITIALIZED;
const char *serr = ::sqlite3_errmsg(mDBConn);
_errorString.Assign(serr);
return NS_OK;
}
NS_IMETHODIMP
Connection::GetSchemaVersion(int32_t *_version)
{
if (!mDBConn) return NS_ERROR_NOT_INITIALIZED;
nsCOMPtr<mozIStorageStatement> stmt;
(void)CreateStatement(NS_LITERAL_CSTRING("PRAGMA user_version"),
getter_AddRefs(stmt));
NS_ENSURE_TRUE(stmt, NS_ERROR_OUT_OF_MEMORY);
*_version = 0;
bool hasResult;
if (NS_SUCCEEDED(stmt->ExecuteStep(&hasResult)) && hasResult)
*_version = stmt->AsInt32(0);
return NS_OK;
}
NS_IMETHODIMP
Connection::SetSchemaVersion(int32_t aVersion)
{
if (!mDBConn) return NS_ERROR_NOT_INITIALIZED;
nsAutoCString stmt(NS_LITERAL_CSTRING("PRAGMA user_version = "));
stmt.AppendInt(aVersion);
return ExecuteSimpleSQL(stmt);
}
NS_IMETHODIMP
Connection::CreateStatement(const nsACString &aSQLStatement,
mozIStorageStatement **_stmt)
{
NS_ENSURE_ARG_POINTER(_stmt);
if (!mDBConn) return NS_ERROR_NOT_INITIALIZED;
RefPtr<Statement> statement(new Statement());
NS_ENSURE_TRUE(statement, NS_ERROR_OUT_OF_MEMORY);
nsresult rv = statement->initialize(this, mDBConn, aSQLStatement);
NS_ENSURE_SUCCESS(rv, rv);
Statement *rawPtr;
statement.forget(&rawPtr);
*_stmt = rawPtr;
return NS_OK;
}
NS_IMETHODIMP
Connection::CreateAsyncStatement(const nsACString &aSQLStatement,
mozIStorageAsyncStatement **_stmt)
{
NS_ENSURE_ARG_POINTER(_stmt);
if (!mDBConn) return NS_ERROR_NOT_INITIALIZED;
RefPtr<AsyncStatement> statement(new AsyncStatement());
NS_ENSURE_TRUE(statement, NS_ERROR_OUT_OF_MEMORY);
nsresult rv = statement->initialize(this, mDBConn, aSQLStatement);
NS_ENSURE_SUCCESS(rv, rv);
AsyncStatement *rawPtr;
statement.forget(&rawPtr);
*_stmt = rawPtr;
return NS_OK;
}
NS_IMETHODIMP
Connection::ExecuteSimpleSQL(const nsACString &aSQLStatement)
{
CHECK_MAINTHREAD_ABUSE();
if (!mDBConn) return NS_ERROR_NOT_INITIALIZED;
int srv = executeSql(mDBConn, PromiseFlatCString(aSQLStatement).get());
return convertResultCode(srv);
}
NS_IMETHODIMP
Connection::ExecuteAsync(mozIStorageBaseStatement **aStatements,
uint32_t aNumStatements,
mozIStorageStatementCallback *aCallback,
mozIStoragePendingStatement **_handle)
{
nsTArray<StatementData> stmts(aNumStatements);
for (uint32_t i = 0; i < aNumStatements; i++) {
nsCOMPtr<StorageBaseStatementInternal> stmt =
do_QueryInterface(aStatements[i]);
// Obtain our StatementData.
StatementData data;
nsresult rv = stmt->getAsynchronousStatementData(data);
NS_ENSURE_SUCCESS(rv, rv);
NS_ASSERTION(stmt->getOwner() == this,
"Statement must be from this database connection!");
// Now append it to our array.
NS_ENSURE_TRUE(stmts.AppendElement(data), NS_ERROR_OUT_OF_MEMORY);
}
// Dispatch to the background
return AsyncExecuteStatements::execute(stmts, this, mDBConn, aCallback,
_handle);
}
NS_IMETHODIMP
Connection::ExecuteSimpleSQLAsync(const nsACString &aSQLStatement,
mozIStorageStatementCallback *aCallback,
mozIStoragePendingStatement **_handle)
{
NS_ENSURE_TRUE(NS_IsMainThread(), NS_ERROR_NOT_SAME_THREAD);
nsCOMPtr<mozIStorageAsyncStatement> stmt;
nsresult rv = CreateAsyncStatement(aSQLStatement, getter_AddRefs(stmt));
if (NS_FAILED(rv)) {
return rv;
}
nsCOMPtr<mozIStoragePendingStatement> pendingStatement;
rv = stmt->ExecuteAsync(aCallback, getter_AddRefs(pendingStatement));
if (NS_FAILED(rv)) {
return rv;
}
pendingStatement.forget(_handle);
return rv;
}
NS_IMETHODIMP
Connection::TableExists(const nsACString &aTableName,
bool *_exists)
{
return databaseElementExists(TABLE, aTableName, _exists);
}
NS_IMETHODIMP
Connection::IndexExists(const nsACString &aIndexName,
bool* _exists)
{
return databaseElementExists(INDEX, aIndexName, _exists);
}
NS_IMETHODIMP
Connection::GetTransactionInProgress(bool *_inProgress)
{
if (!mDBConn) return NS_ERROR_NOT_INITIALIZED;
SQLiteMutexAutoLock lockedScope(sharedDBMutex);
*_inProgress = mTransactionInProgress;
return NS_OK;
}
NS_IMETHODIMP
Connection::BeginTransaction()
{
return BeginTransactionAs(mozIStorageConnection::TRANSACTION_DEFERRED);
}
NS_IMETHODIMP
Connection::BeginTransactionAs(int32_t aTransactionType)
{
if (!mDBConn) return NS_ERROR_NOT_INITIALIZED;
return beginTransactionInternal(mDBConn, aTransactionType);
}
nsresult
Connection::beginTransactionInternal(sqlite3 *aNativeConnection,
int32_t aTransactionType)
{
SQLiteMutexAutoLock lockedScope(sharedDBMutex);
if (mTransactionInProgress)
return NS_ERROR_FAILURE;
nsresult rv;
switch(aTransactionType) {
case TRANSACTION_DEFERRED:
rv = convertResultCode(executeSql(aNativeConnection, "BEGIN DEFERRED"));
break;
case TRANSACTION_IMMEDIATE:
rv = convertResultCode(executeSql(aNativeConnection, "BEGIN IMMEDIATE"));
break;
case TRANSACTION_EXCLUSIVE:
rv = convertResultCode(executeSql(aNativeConnection, "BEGIN EXCLUSIVE"));
break;
default:
return NS_ERROR_ILLEGAL_VALUE;
}
if (NS_SUCCEEDED(rv))
mTransactionInProgress = true;
return rv;
}
NS_IMETHODIMP
Connection::CommitTransaction()
{
if (!mDBConn)
return NS_ERROR_NOT_INITIALIZED;
return commitTransactionInternal(mDBConn);
}
nsresult
Connection::commitTransactionInternal(sqlite3 *aNativeConnection)
{
SQLiteMutexAutoLock lockedScope(sharedDBMutex);
if (!mTransactionInProgress)
return NS_ERROR_UNEXPECTED;
nsresult rv =
convertResultCode(executeSql(aNativeConnection, "COMMIT TRANSACTION"));
if (NS_SUCCEEDED(rv))
mTransactionInProgress = false;
return rv;
}
NS_IMETHODIMP
Connection::RollbackTransaction()
{
if (!mDBConn)
return NS_ERROR_NOT_INITIALIZED;
return rollbackTransactionInternal(mDBConn);
}
nsresult
Connection::rollbackTransactionInternal(sqlite3 *aNativeConnection)
{
SQLiteMutexAutoLock lockedScope(sharedDBMutex);
if (!mTransactionInProgress)
return NS_ERROR_UNEXPECTED;
nsresult rv =
convertResultCode(executeSql(aNativeConnection, "ROLLBACK TRANSACTION"));
if (NS_SUCCEEDED(rv))
mTransactionInProgress = false;
return rv;
}
NS_IMETHODIMP
Connection::CreateTable(const char *aTableName,
const char *aTableSchema)
{
if (!mDBConn) return NS_ERROR_NOT_INITIALIZED;
SmprintfPointer buf = ::mozilla::Smprintf("CREATE TABLE %s (%s)", aTableName, aTableSchema);
if (!buf)
return NS_ERROR_OUT_OF_MEMORY;
int srv = executeSql(mDBConn, buf.get());
return convertResultCode(srv);
}
NS_IMETHODIMP
Connection::CreateFunction(const nsACString &aFunctionName,
int32_t aNumArguments,
mozIStorageFunction *aFunction)
{
if (!mDBConn) return NS_ERROR_NOT_INITIALIZED;
// Check to see if this function is already defined. We only check the name
// because a function can be defined with the same body but different names.
SQLiteMutexAutoLock lockedScope(sharedDBMutex);
NS_ENSURE_FALSE(mFunctions.Get(aFunctionName, nullptr), NS_ERROR_FAILURE);
int srv = ::sqlite3_create_function(mDBConn,
nsPromiseFlatCString(aFunctionName).get(),
aNumArguments,
SQLITE_ANY,
aFunction,
basicFunctionHelper,
nullptr,
nullptr);
if (srv != SQLITE_OK)
return convertResultCode(srv);
FunctionInfo info = { aFunction,
Connection::FunctionInfo::SIMPLE,
aNumArguments };
mFunctions.Put(aFunctionName, info);
return NS_OK;
}
NS_IMETHODIMP
Connection::CreateAggregateFunction(const nsACString &aFunctionName,
int32_t aNumArguments,
mozIStorageAggregateFunction *aFunction)
{
if (!mDBConn) return NS_ERROR_NOT_INITIALIZED;
// Check to see if this function name is already defined.
SQLiteMutexAutoLock lockedScope(sharedDBMutex);
NS_ENSURE_FALSE(mFunctions.Get(aFunctionName, nullptr), NS_ERROR_FAILURE);
// Because aggregate functions depend on state across calls, you cannot have
// the same instance use the same name. We want to enumerate all functions
// and make sure this instance is not already registered.
NS_ENSURE_FALSE(findFunctionByInstance(aFunction), NS_ERROR_FAILURE);
int srv = ::sqlite3_create_function(mDBConn,
nsPromiseFlatCString(aFunctionName).get(),
aNumArguments,
SQLITE_ANY,
aFunction,
nullptr,
aggregateFunctionStepHelper,
aggregateFunctionFinalHelper);
if (srv != SQLITE_OK)
return convertResultCode(srv);
FunctionInfo info = { aFunction,
Connection::FunctionInfo::AGGREGATE,
aNumArguments };
mFunctions.Put(aFunctionName, info);
return NS_OK;
}
NS_IMETHODIMP
Connection::RemoveFunction(const nsACString &aFunctionName)
{
if (!mDBConn) return NS_ERROR_NOT_INITIALIZED;
SQLiteMutexAutoLock lockedScope(sharedDBMutex);
NS_ENSURE_TRUE(mFunctions.Get(aFunctionName, nullptr), NS_ERROR_FAILURE);
int srv = ::sqlite3_create_function(mDBConn,
nsPromiseFlatCString(aFunctionName).get(),
0,
SQLITE_ANY,
nullptr,
nullptr,
nullptr,
nullptr);
if (srv != SQLITE_OK)
return convertResultCode(srv);
mFunctions.Remove(aFunctionName);
return NS_OK;
}
NS_IMETHODIMP
Connection::SetProgressHandler(int32_t aGranularity,
mozIStorageProgressHandler *aHandler,
mozIStorageProgressHandler **_oldHandler)
{
if (!mDBConn) return NS_ERROR_NOT_INITIALIZED;
// Return previous one
SQLiteMutexAutoLock lockedScope(sharedDBMutex);
NS_IF_ADDREF(*_oldHandler = mProgressHandler);
if (!aHandler || aGranularity <= 0) {
aHandler = nullptr;
aGranularity = 0;
}
mProgressHandler = aHandler;
::sqlite3_progress_handler(mDBConn, aGranularity, sProgressHelper, this);
return NS_OK;
}
NS_IMETHODIMP
Connection::RemoveProgressHandler(mozIStorageProgressHandler **_oldHandler)
{
if (!mDBConn) return NS_ERROR_NOT_INITIALIZED;
// Return previous one
SQLiteMutexAutoLock lockedScope(sharedDBMutex);
NS_IF_ADDREF(*_oldHandler = mProgressHandler);
mProgressHandler = nullptr;
::sqlite3_progress_handler(mDBConn, 0, nullptr, nullptr);
return NS_OK;
}
NS_IMETHODIMP
Connection::SetGrowthIncrement(int32_t aChunkSize, const nsACString &aDatabaseName)
{
// Bug 597215: Disk space is extremely limited on Android
// so don't preallocate space. This is also not effective
// on log structured file systems used by Android devices
#if !defined(ANDROID) && !defined(MOZ_PLATFORM_MAEMO)
// Don't preallocate if less than 500MiB is available.
int64_t bytesAvailable;
nsresult rv = mDatabaseFile->GetDiskSpaceAvailable(&bytesAvailable);
NS_ENSURE_SUCCESS(rv, rv);
if (bytesAvailable < MIN_AVAILABLE_BYTES_PER_CHUNKED_GROWTH) {
return NS_ERROR_FILE_TOO_BIG;
}
(void)::sqlite3_file_control(mDBConn,
aDatabaseName.Length() ? nsPromiseFlatCString(aDatabaseName).get()
: nullptr,
SQLITE_FCNTL_CHUNK_SIZE,
&aChunkSize);
#endif
return NS_OK;
}
NS_IMETHODIMP
Connection::EnableModule(const nsACString& aModuleName)
{
if (!mDBConn) return NS_ERROR_NOT_INITIALIZED;
for (auto& gModule : gModules) {
struct Module* m = &gModule;
if (aModuleName.Equals(m->name)) {
int srv = m->registerFunc(mDBConn, m->name);
if (srv != SQLITE_OK)
return convertResultCode(srv);
return NS_OK;
}
}
return NS_ERROR_FAILURE;
}
// Implemented in TelemetryVFS.cpp
already_AddRefed<QuotaObject>
GetQuotaObjectForFile(sqlite3_file *pFile);
NS_IMETHODIMP
Connection::GetQuotaObjects(QuotaObject** aDatabaseQuotaObject,
QuotaObject** aJournalQuotaObject)
{
MOZ_ASSERT(aDatabaseQuotaObject);
MOZ_ASSERT(aJournalQuotaObject);
if (!mDBConn) {
return NS_ERROR_NOT_INITIALIZED;
}
sqlite3_file* file;
int srv = ::sqlite3_file_control(mDBConn,
nullptr,
SQLITE_FCNTL_FILE_POINTER,
&file);
if (srv != SQLITE_OK) {
return convertResultCode(srv);
}
RefPtr<QuotaObject> databaseQuotaObject = GetQuotaObjectForFile(file);
srv = ::sqlite3_file_control(mDBConn,
nullptr,
SQLITE_FCNTL_JOURNAL_POINTER,
&file);
if (srv != SQLITE_OK) {
return convertResultCode(srv);
}
RefPtr<QuotaObject> journalQuotaObject = GetQuotaObjectForFile(file);
databaseQuotaObject.forget(aDatabaseQuotaObject);
journalQuotaObject.forget(aJournalQuotaObject);
return NS_OK;
}
} // namespace storage
} // namespace mozilla
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