gecko/startupcache/StartupCache.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2; -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Startup Cache.
*
* The Initial Developer of the Original Code is
* The Mozilla Foundation <http://www.mozilla.org/>.
* Portions created by the Initial Developer are Copyright (C) 2009
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Benedict Hsieh <bhsieh@mozilla.com>
* Taras Glek <tglek@mozilla.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "prio.h"
#include "prtypes.h"
#include "pldhash.h"
#include "mozilla/scache/StartupCache.h"
#include "nsAutoPtr.h"
#include "nsClassHashtable.h"
#include "nsComponentManagerUtils.h"
#include "nsDirectoryServiceUtils.h"
#include "nsIClassInfo.h"
#include "nsIFile.h"
#include "nsILocalFile.h"
#include "nsIObserver.h"
#include "nsIObserverService.h"
#include "nsIOutputStream.h"
#include "nsIStartupCache.h"
#include "nsIStorageStream.h"
#include "nsIStreamBufferAccess.h"
#include "nsIStringStream.h"
#include "nsISupports.h"
#include "nsITimer.h"
#include "nsIZipWriter.h"
#include "nsIZipReader.h"
#include "nsWeakReference.h"
#include "nsZipArchive.h"
#include "mozilla/Omnijar.h"
#include "prenv.h"
#include "mozilla/FunctionTimer.h"
#include "nsThreadUtils.h"
#include "nsXULAppAPI.h"
#ifdef IS_BIG_ENDIAN
#define SC_ENDIAN "big"
#else
#define SC_ENDIAN "little"
#endif
#if PR_BYTES_PER_WORD == 4
#define SC_WORDSIZE "4"
#else
#define SC_WORDSIZE "8"
#endif
namespace mozilla {
namespace scache {
static const char sStartupCacheName[] = "startupCache." SC_WORDSIZE "." SC_ENDIAN;
static NS_DEFINE_CID(kZipReaderCID, NS_ZIPREADER_CID);
StartupCache*
StartupCache::GetSingleton()
{
if (!gStartupCache)
StartupCache::InitSingleton();
return StartupCache::gStartupCache;
}
void
StartupCache::DeleteSingleton()
{
delete StartupCache::gStartupCache;
}
nsresult
StartupCache::InitSingleton()
{
nsresult rv;
StartupCache::gStartupCache = new StartupCache();
rv = StartupCache::gStartupCache->Init();
if (NS_FAILED(rv)) {
delete StartupCache::gStartupCache;
StartupCache::gStartupCache = nsnull;
}
return rv;
}
StartupCache* StartupCache::gStartupCache;
PRBool StartupCache::gShutdownInitiated;
StartupCache::StartupCache()
: mArchive(NULL), mStartupWriteInitiated(PR_FALSE), mWriteThread(NULL) {}
StartupCache::~StartupCache()
{
if (mTimer) {
mTimer->Cancel();
}
// Generally, the in-memory table should be empty here,
// but an early shutdown means either mTimer didn't run
// or the write thread is still running.
WaitOnWriteThread();
WriteToDisk();
gStartupCache = nsnull;
}
nsresult
StartupCache::Init()
{
if (XRE_GetProcessType() != GeckoProcessType_Default) {
NS_WARNING("Startup cache is only available in the chrome process");
return NS_ERROR_NOT_AVAILABLE;
}
nsresult rv;
mTable.Init();
#ifdef DEBUG
mWriteObjectMap.Init();
#endif
// This allows to override the startup cache filename
// which is useful from xpcshell, when there is no ProfLDS directory to keep cache in.
char *env = PR_GetEnv("MOZ_STARTUP_CACHE");
if (env) {
rv = NS_NewLocalFile(NS_ConvertUTF8toUTF16(env), PR_FALSE, getter_AddRefs(mFile));
} else {
nsCOMPtr<nsIFile> file;
rv = NS_GetSpecialDirectory("ProfLDS",
getter_AddRefs(file));
if (NS_FAILED(rv)) {
// return silently, this will fail in mochitests's xpcshell process.
return rv;
}
rv = file->AppendNative(NS_LITERAL_CSTRING("startupCache"));
NS_ENSURE_SUCCESS(rv, rv);
// Try to create the directory if it's not there yet
rv = file->Create(nsIFile::DIRECTORY_TYPE, 0777);
if (NS_FAILED(rv) && rv != NS_ERROR_FILE_ALREADY_EXISTS)
return rv;
rv = file->AppendNative(NS_LITERAL_CSTRING(sStartupCacheName));
NS_ENSURE_SUCCESS(rv, rv);
mFile = do_QueryInterface(file);
}
NS_ENSURE_TRUE(mFile, NS_ERROR_UNEXPECTED);
mObserverService = do_GetService("@mozilla.org/observer-service;1");
if (!mObserverService) {
NS_WARNING("Could not get observerService.");
return NS_ERROR_UNEXPECTED;
}
mListener = new StartupCacheListener();
rv = mObserverService->AddObserver(mListener, NS_XPCOM_SHUTDOWN_OBSERVER_ID,
PR_FALSE);
NS_ENSURE_SUCCESS(rv, rv);
rv = mObserverService->AddObserver(mListener, "startupcache-invalidate",
PR_FALSE);
NS_ENSURE_SUCCESS(rv, rv);
rv = LoadArchive();
// Sometimes we don't have a cache yet, that's ok.
// If it's corrupted, just remove it and start over.
if (NS_FAILED(rv) && rv != NS_ERROR_FILE_NOT_FOUND) {
NS_WARNING("Failed to load startupcache file correctly, removing!");
InvalidateCache();
}
return NS_OK;
}
/**
* LoadArchive can be called from the main thread or while reloading cache on write thread.
*/
nsresult
StartupCache::LoadArchive()
{
PRBool exists;
mArchive = NULL;
nsresult rv = mFile->Exists(&exists);
if (NS_FAILED(rv) || !exists)
return NS_ERROR_FILE_NOT_FOUND;
mArchive = new nsZipArchive();
return mArchive->OpenArchive(mFile);
}
// NOTE: this will not find a new entry until it has been written to disk!
// Consumer should take ownership of the resulting buffer.
nsresult
StartupCache::GetBuffer(const char* id, char** outbuf, PRUint32* length)
{
NS_ASSERTION(NS_IsMainThread(), "Startup cache only available on main thread");
WaitOnWriteThread();
if (!mStartupWriteInitiated) {
CacheEntry* entry;
nsDependentCString idStr(id);
mTable.Get(idStr, &entry);
if (entry) {
*outbuf = new char[entry->size];
memcpy(*outbuf, entry->data, entry->size);
*length = entry->size;
return NS_OK;
}
}
if (mArchive) {
nsZipItemPtr<char> zipItem(mArchive, id, true);
if (zipItem) {
*outbuf = zipItem.Forget();
*length = zipItem.Length();
return NS_OK;
}
}
if (mozilla::Omnijar::GetReader(mozilla::Omnijar::APP)) {
// no need to checksum omnijarred entries
nsZipItemPtr<char> zipItem(mozilla::Omnijar::GetReader(mozilla::Omnijar::APP), id, true);
if (zipItem) {
*outbuf = zipItem.Forget();
*length = zipItem.Length();
return NS_OK;
}
}
if (mozilla::Omnijar::GetReader(mozilla::Omnijar::GRE)) {
// no need to checksum omnijarred entries
nsZipItemPtr<char> zipItem(mozilla::Omnijar::GetReader(mozilla::Omnijar::GRE), id, true);
if (zipItem) {
*outbuf = zipItem.Forget();
*length = zipItem.Length();
return NS_OK;
}
}
return NS_ERROR_NOT_AVAILABLE;
}
// Makes a copy of the buffer, client retains ownership of inbuf.
nsresult
StartupCache::PutBuffer(const char* id, const char* inbuf, PRUint32 len)
{
NS_ASSERTION(NS_IsMainThread(), "Startup cache only available on main thread");
WaitOnWriteThread();
if (StartupCache::gShutdownInitiated) {
return NS_ERROR_NOT_AVAILABLE;
}
nsAutoArrayPtr<char> data(new char[len]);
memcpy(data, inbuf, len);
nsDependentCString idStr(id);
// Cache it for now, we'll write all together later.
CacheEntry* entry;
#ifdef DEBUG
mTable.Get(idStr, &entry);
NS_ASSERTION(entry == nsnull, "Existing entry in StartupCache.");
if (mArchive) {
nsZipItem* zipItem = mArchive->GetItem(id);
NS_ASSERTION(zipItem == nsnull, "Existing entry in disk StartupCache.");
}
#endif
entry = new CacheEntry(data.forget(), len);
mTable.Put(idStr, entry);
return ResetStartupWriteTimer();
}
struct CacheWriteHolder
{
nsCOMPtr<nsIZipWriter> writer;
nsCOMPtr<nsIStringInputStream> stream;
PRTime time;
};
PLDHashOperator
CacheCloseHelper(const nsACString& key, nsAutoPtr<CacheEntry>& data,
void* closure)
{
nsresult rv;
CacheWriteHolder* holder = (CacheWriteHolder*) closure;
nsIStringInputStream* stream = holder->stream;
nsIZipWriter* writer = holder->writer;
stream->ShareData(data->data, data->size);
#ifdef DEBUG
PRBool hasEntry;
rv = writer->HasEntry(key, &hasEntry);
NS_ASSERTION(NS_SUCCEEDED(rv) && hasEntry == PR_FALSE,
"Existing entry in disk StartupCache.");
#endif
rv = writer->AddEntryStream(key, holder->time, PR_TRUE, stream, PR_FALSE);
if (NS_FAILED(rv)) {
NS_WARNING("cache entry deleted but not written to disk.");
}
return PL_DHASH_REMOVE;
}
/**
* WriteToDisk writes the cache out to disk. Callers of WriteToDisk need to call WaitOnWriteThread
* to make sure there isn't a write happening on another thread
*/
void
StartupCache::WriteToDisk()
{
nsresult rv;
mStartupWriteInitiated = PR_TRUE;
if (mTable.Count() == 0)
return;
nsCOMPtr<nsIZipWriter> zipW = do_CreateInstance("@mozilla.org/zipwriter;1");
if (!zipW)
return;
rv = zipW->Open(mFile, PR_RDWR | PR_CREATE_FILE);
if (NS_FAILED(rv)) {
NS_WARNING("could not open zipfile for write");
return;
}
nsCOMPtr<nsIStringInputStream> stream
= do_CreateInstance("@mozilla.org/io/string-input-stream;1", &rv);
if (NS_FAILED(rv)) {
NS_WARNING("Couldn't create string input stream.");
return;
}
CacheWriteHolder holder;
holder.stream = stream;
holder.writer = zipW;
holder.time = PR_Now();
mTable.Enumerate(CacheCloseHelper, &holder);
// Close the archive so Windows doesn't choke.
mArchive = NULL;
zipW->Close();
// our reader's view of the archive is outdated now, reload it.
LoadArchive();
return;
}
void
StartupCache::InvalidateCache()
{
WaitOnWriteThread();
mTable.Clear();
mArchive = NULL;
mFile->Remove(false);
LoadArchive();
}
/*
* WaitOnWriteThread() is called from a main thread to wait for the worker
* thread to finish. However since the same code is used in the worker thread and
* main thread, the worker thread can also call WaitOnWriteThread() which is a no-op.
*/
void
StartupCache::WaitOnWriteThread()
{
NS_ASSERTION(NS_IsMainThread(), "Startup cache should only wait for io thread on main thread");
if (!mWriteThread || mWriteThread == PR_GetCurrentThread())
return;
NS_TIME_FUNCTION_MIN(30);
PR_JoinThread(mWriteThread);
mWriteThread = NULL;
}
void
StartupCache::ThreadedWrite(void *aClosure)
{
gStartupCache->WriteToDisk();
}
/*
* The write-thread is spawned on a timeout(which is reset with every write). This
* can avoid a slow shutdown. After writing out the cache, the zipreader is
* reloaded on the worker thread.
*/
void
StartupCache::WriteTimeout(nsITimer *aTimer, void *aClosure)
{
gStartupCache->mWriteThread = PR_CreateThread(PR_USER_THREAD,
StartupCache::ThreadedWrite,
NULL,
PR_PRIORITY_NORMAL,
PR_LOCAL_THREAD,
PR_JOINABLE_THREAD,
0);
}
// We don't want to refcount StartupCache, so we'll just
// hold a ref to this and pass it to observerService instead.
NS_IMPL_THREADSAFE_ISUPPORTS1(StartupCacheListener, nsIObserver)
nsresult
StartupCacheListener::Observe(nsISupports *subject, const char* topic, const PRUnichar* data)
{
StartupCache* sc = StartupCache::GetSingleton();
if (!sc)
return NS_OK;
if (strcmp(topic, NS_XPCOM_SHUTDOWN_OBSERVER_ID) == 0) {
// Do not leave the thread running past xpcom shutdown
sc->WaitOnWriteThread();
StartupCache::gShutdownInitiated = PR_TRUE;
} else if (strcmp(topic, "startupcache-invalidate") == 0) {
sc->InvalidateCache();
}
return NS_OK;
}
nsresult
StartupCache::GetDebugObjectOutputStream(nsIObjectOutputStream* aStream,
nsIObjectOutputStream** aOutStream)
{
NS_ENSURE_ARG_POINTER(aStream);
#ifdef DEBUG
StartupCacheDebugOutputStream* stream
= new StartupCacheDebugOutputStream(aStream, &mWriteObjectMap);
NS_ADDREF(*aOutStream = stream);
#else
NS_ADDREF(*aOutStream = aStream);
#endif
return NS_OK;
}
nsresult
StartupCache::ResetStartupWriteTimer()
{
mStartupWriteInitiated = PR_FALSE;
nsresult rv;
if (!mTimer)
mTimer = do_CreateInstance("@mozilla.org/timer;1", &rv);
else
rv = mTimer->Cancel();
NS_ENSURE_SUCCESS(rv, rv);
// Wait for 10 seconds, then write out the cache.
mTimer->InitWithFuncCallback(StartupCache::WriteTimeout, this, 60000,
nsITimer::TYPE_ONE_SHOT);
return NS_OK;
}
// StartupCacheDebugOutputStream implementation
#ifdef DEBUG
NS_IMPL_ISUPPORTS3(StartupCacheDebugOutputStream, nsIObjectOutputStream,
nsIBinaryOutputStream, nsIOutputStream)
PRBool
StartupCacheDebugOutputStream::CheckReferences(nsISupports* aObject)
{
nsresult rv;
nsCOMPtr<nsIClassInfo> classInfo = do_QueryInterface(aObject);
if (!classInfo) {
NS_ERROR("aObject must implement nsIClassInfo");
return PR_FALSE;
}
PRUint32 flags;
rv = classInfo->GetFlags(&flags);
NS_ENSURE_SUCCESS(rv, rv);
if (flags & nsIClassInfo::SINGLETON)
return PR_TRUE;
nsISupportsHashKey* key = mObjectMap->GetEntry(aObject);
if (key) {
NS_ERROR("non-singleton aObject is referenced multiple times in this"
"serialization, we don't support that.");
return PR_FALSE;
}
mObjectMap->PutEntry(aObject);
return PR_TRUE;
}
// nsIObjectOutputStream implementation
nsresult
StartupCacheDebugOutputStream::WriteObject(nsISupports* aObject, PRBool aIsStrongRef)
{
nsCOMPtr<nsISupports> rootObject(do_QueryInterface(aObject));
NS_ASSERTION(rootObject.get() == aObject,
"bad call to WriteObject -- call WriteCompoundObject!");
PRBool check = CheckReferences(aObject);
NS_ENSURE_TRUE(check, NS_ERROR_FAILURE);
return mBinaryStream->WriteObject(aObject, aIsStrongRef);
}
nsresult
StartupCacheDebugOutputStream::WriteSingleRefObject(nsISupports* aObject)
{
nsCOMPtr<nsISupports> rootObject(do_QueryInterface(aObject));
NS_ASSERTION(rootObject.get() == aObject,
"bad call to WriteSingleRefObject -- call WriteCompoundObject!");
PRBool check = CheckReferences(aObject);
NS_ENSURE_TRUE(check, NS_ERROR_FAILURE);
return mBinaryStream->WriteSingleRefObject(aObject);
}
nsresult
StartupCacheDebugOutputStream::WriteCompoundObject(nsISupports* aObject,
const nsIID& aIID,
PRBool aIsStrongRef)
{
nsCOMPtr<nsISupports> rootObject(do_QueryInterface(aObject));
nsCOMPtr<nsISupports> roundtrip;
rootObject->QueryInterface(aIID, getter_AddRefs(roundtrip));
NS_ASSERTION(roundtrip.get() == aObject,
"bad aggregation or multiple inheritance detected by call to "
"WriteCompoundObject!");
PRBool check = CheckReferences(aObject);
NS_ENSURE_TRUE(check, NS_ERROR_FAILURE);
return mBinaryStream->WriteCompoundObject(aObject, aIID, aIsStrongRef);
}
nsresult
StartupCacheDebugOutputStream::WriteID(nsID const& aID)
{
return mBinaryStream->WriteID(aID);
}
char*
StartupCacheDebugOutputStream::GetBuffer(PRUint32 aLength, PRUint32 aAlignMask)
{
return mBinaryStream->GetBuffer(aLength, aAlignMask);
}
void
StartupCacheDebugOutputStream::PutBuffer(char* aBuffer, PRUint32 aLength)
{
mBinaryStream->PutBuffer(aBuffer, aLength);
}
#endif //DEBUG
StartupCacheWrapper* StartupCacheWrapper::gStartupCacheWrapper = nsnull;
NS_IMPL_THREADSAFE_ISUPPORTS1(StartupCacheWrapper, nsIStartupCache)
StartupCacheWrapper* StartupCacheWrapper::GetSingleton()
{
if (!gStartupCacheWrapper)
gStartupCacheWrapper = new StartupCacheWrapper();
NS_ADDREF(gStartupCacheWrapper);
return gStartupCacheWrapper;
}
nsresult
StartupCacheWrapper::GetBuffer(const char* id, char** outbuf, PRUint32* length)
{
StartupCache* sc = StartupCache::GetSingleton();
if (!sc) {
return NS_ERROR_NOT_INITIALIZED;
}
return sc->GetBuffer(id, outbuf, length);
}
nsresult
StartupCacheWrapper::PutBuffer(const char* id, char* inbuf, PRUint32 length)
{
StartupCache* sc = StartupCache::GetSingleton();
if (!sc) {
return NS_ERROR_NOT_INITIALIZED;
}
return sc->PutBuffer(id, inbuf, length);
}
nsresult
StartupCacheWrapper::InvalidateCache()
{
StartupCache* sc = StartupCache::GetSingleton();
if (!sc) {
return NS_ERROR_NOT_INITIALIZED;
}
sc->InvalidateCache();
return NS_OK;
}
nsresult
StartupCacheWrapper::GetDebugObjectOutputStream(nsIObjectOutputStream* stream,
nsIObjectOutputStream** outStream)
{
StartupCache* sc = StartupCache::GetSingleton();
if (!sc) {
return NS_ERROR_NOT_INITIALIZED;
}
return sc->GetDebugObjectOutputStream(stream, outStream);
}
nsresult
StartupCacheWrapper::StartupWriteComplete(PRBool *complete)
{
StartupCache* sc = StartupCache::GetSingleton();
if (!sc) {
return NS_ERROR_NOT_INITIALIZED;
}
sc->WaitOnWriteThread();
*complete = sc->mStartupWriteInitiated && sc->mTable.Count() == 0;
return NS_OK;
}
nsresult
StartupCacheWrapper::ResetStartupWriteTimer()
{
StartupCache* sc = StartupCache::GetSingleton();
return sc ? sc->ResetStartupWriteTimer() : NS_ERROR_NOT_INITIALIZED;
}
nsresult
StartupCacheWrapper::GetObserver(nsIObserver** obv) {
StartupCache* sc = StartupCache::GetSingleton();
if (!sc) {
return NS_ERROR_NOT_INITIALIZED;
}
NS_ADDREF(*obv = sc->mListener);
return NS_OK;
}
} // namespace scache
} // namespace mozilla