diff options
Diffstat (limited to 'netwerk/cache2/CacheFileContextEvictor.cpp')
| -rw-r--r-- | netwerk/cache2/CacheFileContextEvictor.cpp | 663 |
1 files changed, 663 insertions, 0 deletions
diff --git a/netwerk/cache2/CacheFileContextEvictor.cpp b/netwerk/cache2/CacheFileContextEvictor.cpp new file mode 100644 index 000000000..acf089b79 --- /dev/null +++ b/netwerk/cache2/CacheFileContextEvictor.cpp @@ -0,0 +1,663 @@ +/* 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 "CacheLog.h" +#include "CacheFileContextEvictor.h" +#include "CacheFileIOManager.h" +#include "CacheIndex.h" +#include "CacheIndexIterator.h" +#include "CacheFileUtils.h" +#include "nsIFile.h" +#include "LoadContextInfo.h" +#include "nsThreadUtils.h" +#include "nsString.h" +#include "nsISimpleEnumerator.h" +#include "nsIDirectoryEnumerator.h" +#include "mozilla/Base64.h" + + +namespace mozilla { +namespace net { + +#define CONTEXT_EVICTION_PREFIX "ce_" +const uint32_t kContextEvictionPrefixLength = + sizeof(CONTEXT_EVICTION_PREFIX) - 1; + +bool CacheFileContextEvictor::sDiskAlreadySearched = false; + +CacheFileContextEvictor::CacheFileContextEvictor() + : mEvicting(false) + , mIndexIsUpToDate(false) +{ + LOG(("CacheFileContextEvictor::CacheFileContextEvictor() [this=%p]", this)); +} + +CacheFileContextEvictor::~CacheFileContextEvictor() +{ + LOG(("CacheFileContextEvictor::~CacheFileContextEvictor() [this=%p]", this)); +} + +nsresult +CacheFileContextEvictor::Init(nsIFile *aCacheDirectory) +{ + LOG(("CacheFileContextEvictor::Init()")); + + nsresult rv; + + MOZ_ASSERT(CacheFileIOManager::IsOnIOThread()); + + CacheIndex::IsUpToDate(&mIndexIsUpToDate); + + mCacheDirectory = aCacheDirectory; + + rv = aCacheDirectory->Clone(getter_AddRefs(mEntriesDir)); + if (NS_WARN_IF(NS_FAILED(rv))) { + return rv; + } + + rv = mEntriesDir->AppendNative(NS_LITERAL_CSTRING(ENTRIES_DIR)); + if (NS_WARN_IF(NS_FAILED(rv))) { + return rv; + } + + if (!sDiskAlreadySearched) { + LoadEvictInfoFromDisk(); + if ((mEntries.Length() != 0) && mIndexIsUpToDate) { + CreateIterators(); + StartEvicting(); + } + } + + return NS_OK; +} + +uint32_t +CacheFileContextEvictor::ContextsCount() +{ + MOZ_ASSERT(CacheFileIOManager::IsOnIOThread()); + + return mEntries.Length(); +} + +nsresult +CacheFileContextEvictor::AddContext(nsILoadContextInfo *aLoadContextInfo, + bool aPinned) +{ + LOG(("CacheFileContextEvictor::AddContext() [this=%p, loadContextInfo=%p, pinned=%d]", + this, aLoadContextInfo, aPinned)); + + nsresult rv; + + MOZ_ASSERT(CacheFileIOManager::IsOnIOThread()); + + CacheFileContextEvictorEntry *entry = nullptr; + if (aLoadContextInfo) { + for (uint32_t i = 0; i < mEntries.Length(); ++i) { + if (mEntries[i]->mInfo && + mEntries[i]->mInfo->Equals(aLoadContextInfo) && + mEntries[i]->mPinned == aPinned) { + entry = mEntries[i]; + break; + } + } + } else { + // Not providing load context info means we want to delete everything, + // so let's not bother with any currently running context cleanups + // for the same pinning state. + for (uint32_t i = mEntries.Length(); i > 0;) { + --i; + if (mEntries[i]->mInfo && mEntries[i]->mPinned == aPinned) { + RemoveEvictInfoFromDisk(mEntries[i]->mInfo, mEntries[i]->mPinned); + mEntries.RemoveElementAt(i); + } + } + } + + if (!entry) { + entry = new CacheFileContextEvictorEntry(); + entry->mInfo = aLoadContextInfo; + entry->mPinned = aPinned; + mEntries.AppendElement(entry); + } + + entry->mTimeStamp = PR_Now() / PR_USEC_PER_MSEC; + + PersistEvictionInfoToDisk(aLoadContextInfo, aPinned); + + if (mIndexIsUpToDate) { + // Already existing context could be added again, in this case the iterator + // would be recreated. Close the old iterator explicitely. + if (entry->mIterator) { + entry->mIterator->Close(); + entry->mIterator = nullptr; + } + + rv = CacheIndex::GetIterator(aLoadContextInfo, false, + getter_AddRefs(entry->mIterator)); + if (NS_FAILED(rv)) { + // This could probably happen during shutdown. Remove the entry from + // the array, but leave the info on the disk. No entry can be opened + // during shutdown and we'll load the eviction info on next start. + LOG(("CacheFileContextEvictor::AddContext() - Cannot get an iterator. " + "[rv=0x%08x]", rv)); + mEntries.RemoveElement(entry); + return rv; + } + + StartEvicting(); + } + + return NS_OK; +} + +nsresult +CacheFileContextEvictor::CacheIndexStateChanged() +{ + LOG(("CacheFileContextEvictor::CacheIndexStateChanged() [this=%p]", this)); + + MOZ_ASSERT(CacheFileIOManager::IsOnIOThread()); + + bool isUpToDate = false; + CacheIndex::IsUpToDate(&isUpToDate); + if (mEntries.Length() == 0) { + // Just save the state and exit, since there is nothing to do + mIndexIsUpToDate = isUpToDate; + return NS_OK; + } + + if (!isUpToDate && !mIndexIsUpToDate) { + // Index is outdated and status has not changed, nothing to do. + return NS_OK; + } + + if (isUpToDate && mIndexIsUpToDate) { + // Status has not changed, but make sure the eviction is running. + if (mEvicting) { + return NS_OK; + } + + // We're not evicting, but we should be evicting?! + LOG(("CacheFileContextEvictor::CacheIndexStateChanged() - Index is up to " + "date, we have some context to evict but eviction is not running! " + "Starting now.")); + } + + mIndexIsUpToDate = isUpToDate; + + if (mIndexIsUpToDate) { + CreateIterators(); + StartEvicting(); + } else { + CloseIterators(); + } + + return NS_OK; +} + +nsresult +CacheFileContextEvictor::WasEvicted(const nsACString &aKey, nsIFile *aFile, + bool *aEvictedAsPinned, bool *aEvictedAsNonPinned) +{ + LOG(("CacheFileContextEvictor::WasEvicted() [key=%s]", + PromiseFlatCString(aKey).get())); + + nsresult rv; + + *aEvictedAsPinned = false; + *aEvictedAsNonPinned = false; + + MOZ_ASSERT(CacheFileIOManager::IsOnIOThread()); + + nsCOMPtr<nsILoadContextInfo> info = CacheFileUtils::ParseKey(aKey); + MOZ_ASSERT(info); + if (!info) { + LOG(("CacheFileContextEvictor::WasEvicted() - Cannot parse key!")); + return NS_OK; + } + + for (uint32_t i = 0; i < mEntries.Length(); ++i) { + CacheFileContextEvictorEntry *entry = mEntries[i]; + + if (entry->mInfo && !info->Equals(entry->mInfo)) { + continue; + } + + PRTime lastModifiedTime; + rv = aFile->GetLastModifiedTime(&lastModifiedTime); + if (NS_FAILED(rv)) { + LOG(("CacheFileContextEvictor::WasEvicted() - Cannot get last modified time" + ", returning false.")); + return NS_OK; + } + + if (lastModifiedTime > entry->mTimeStamp) { + // File has been modified since context eviction. + continue; + } + + LOG(("CacheFileContextEvictor::WasEvicted() - evicted [pinning=%d, " + "mTimeStamp=%lld, lastModifiedTime=%lld]", + entry->mPinned, entry->mTimeStamp, lastModifiedTime)); + + if (entry->mPinned) { + *aEvictedAsPinned = true; + } else { + *aEvictedAsNonPinned = true; + } + } + + return NS_OK; +} + +nsresult +CacheFileContextEvictor::PersistEvictionInfoToDisk( + nsILoadContextInfo *aLoadContextInfo, bool aPinned) +{ + LOG(("CacheFileContextEvictor::PersistEvictionInfoToDisk() [this=%p, " + "loadContextInfo=%p]", this, aLoadContextInfo)); + + nsresult rv; + + MOZ_ASSERT(CacheFileIOManager::IsOnIOThread()); + + nsCOMPtr<nsIFile> file; + rv = GetContextFile(aLoadContextInfo, aPinned, getter_AddRefs(file)); + if (NS_WARN_IF(NS_FAILED(rv))) { + return rv; + } + + nsAutoCString path; + file->GetNativePath(path); + + PRFileDesc *fd; + rv = file->OpenNSPRFileDesc(PR_RDWR | PR_CREATE_FILE | PR_TRUNCATE, 0600, + &fd); + if (NS_WARN_IF(NS_FAILED(rv))) { + LOG(("CacheFileContextEvictor::PersistEvictionInfoToDisk() - Creating file " + "failed! [path=%s, rv=0x%08x]", path.get(), rv)); + return rv; + } + + PR_Close(fd); + + LOG(("CacheFileContextEvictor::PersistEvictionInfoToDisk() - Successfully " + "created file. [path=%s]", path.get())); + + return NS_OK; +} + +nsresult +CacheFileContextEvictor::RemoveEvictInfoFromDisk( + nsILoadContextInfo *aLoadContextInfo, bool aPinned) +{ + LOG(("CacheFileContextEvictor::RemoveEvictInfoFromDisk() [this=%p, " + "loadContextInfo=%p]", this, aLoadContextInfo)); + + nsresult rv; + + MOZ_ASSERT(CacheFileIOManager::IsOnIOThread()); + + nsCOMPtr<nsIFile> file; + rv = GetContextFile(aLoadContextInfo, aPinned, getter_AddRefs(file)); + if (NS_WARN_IF(NS_FAILED(rv))) { + return rv; + } + + nsAutoCString path; + file->GetNativePath(path); + + rv = file->Remove(false); + if (NS_WARN_IF(NS_FAILED(rv))) { + LOG(("CacheFileContextEvictor::RemoveEvictionInfoFromDisk() - Removing file" + " failed! [path=%s, rv=0x%08x]", path.get(), rv)); + return rv; + } + + LOG(("CacheFileContextEvictor::RemoveEvictionInfoFromDisk() - Successfully " + "removed file. [path=%s]", path.get())); + + return NS_OK; +} + +nsresult +CacheFileContextEvictor::LoadEvictInfoFromDisk() +{ + LOG(("CacheFileContextEvictor::LoadEvictInfoFromDisk() [this=%p]", this)); + + nsresult rv; + + MOZ_ASSERT(CacheFileIOManager::IsOnIOThread()); + + sDiskAlreadySearched = true; + + nsCOMPtr<nsISimpleEnumerator> enumerator; + rv = mCacheDirectory->GetDirectoryEntries(getter_AddRefs(enumerator)); + if (NS_WARN_IF(NS_FAILED(rv))) { + return rv; + } + + nsCOMPtr<nsIDirectoryEnumerator> dirEnum = do_QueryInterface(enumerator, &rv); + if (NS_WARN_IF(NS_FAILED(rv))) { + return rv; + } + + while (true) { + nsCOMPtr<nsIFile> file; + rv = dirEnum->GetNextFile(getter_AddRefs(file)); + if (!file) { + break; + } + + bool isDir = false; + file->IsDirectory(&isDir); + if (isDir) { + continue; + } + + nsAutoCString leaf; + rv = file->GetNativeLeafName(leaf); + if (NS_FAILED(rv)) { + LOG(("CacheFileContextEvictor::LoadEvictInfoFromDisk() - " + "GetNativeLeafName() failed! Skipping file.")); + continue; + } + + if (leaf.Length() < kContextEvictionPrefixLength) { + continue; + } + + if (!StringBeginsWith(leaf, NS_LITERAL_CSTRING(CONTEXT_EVICTION_PREFIX))) { + continue; + } + + nsAutoCString encoded; + encoded = Substring(leaf, kContextEvictionPrefixLength); + encoded.ReplaceChar('-', '/'); + + nsAutoCString decoded; + rv = Base64Decode(encoded, decoded); + if (NS_FAILED(rv)) { + LOG(("CacheFileContextEvictor::LoadEvictInfoFromDisk() - Base64 decoding " + "failed. Removing the file. [file=%s]", leaf.get())); + file->Remove(false); + continue; + } + + bool pinned = decoded[0] == '\t'; + if (pinned) { + decoded = Substring(decoded, 1); + } + + nsCOMPtr<nsILoadContextInfo> info; + if (!NS_LITERAL_CSTRING("*").Equals(decoded)) { + // "*" is indication of 'delete all', info left null will pass + // to CacheFileContextEvictor::AddContext and clear all the cache data. + info = CacheFileUtils::ParseKey(decoded); + if (!info) { + LOG(("CacheFileContextEvictor::LoadEvictInfoFromDisk() - Cannot parse " + "context key, removing file. [contextKey=%s, file=%s]", + decoded.get(), leaf.get())); + file->Remove(false); + continue; + } + } + + + PRTime lastModifiedTime; + rv = file->GetLastModifiedTime(&lastModifiedTime); + if (NS_FAILED(rv)) { + continue; + } + + CacheFileContextEvictorEntry *entry = new CacheFileContextEvictorEntry(); + entry->mInfo = info; + entry->mPinned = pinned; + entry->mTimeStamp = lastModifiedTime; + mEntries.AppendElement(entry); + } + + return NS_OK; +} + +nsresult +CacheFileContextEvictor::GetContextFile(nsILoadContextInfo *aLoadContextInfo, + bool aPinned, + nsIFile **_retval) +{ + nsresult rv; + + nsAutoCString leafName; + leafName.AssignLiteral(CONTEXT_EVICTION_PREFIX); + + nsAutoCString keyPrefix; + if (aPinned) { + // Mark pinned context files with a tab char at the start. + // Tab is chosen because it can never be used as a context key tag. + keyPrefix.Append('\t'); + } + if (aLoadContextInfo) { + CacheFileUtils::AppendKeyPrefix(aLoadContextInfo, keyPrefix); + } else { + keyPrefix.Append('*'); + } + + nsAutoCString data64; + rv = Base64Encode(keyPrefix, data64); + if (NS_WARN_IF(NS_FAILED(rv))) { + return rv; + } + + // Replace '/' with '-' since '/' cannot be part of the filename. + data64.ReplaceChar('/', '-'); + + leafName.Append(data64); + + nsCOMPtr<nsIFile> file; + rv = mCacheDirectory->Clone(getter_AddRefs(file)); + if (NS_WARN_IF(NS_FAILED(rv))) { + return rv; + } + + rv = file->AppendNative(leafName); + if (NS_WARN_IF(NS_FAILED(rv))) { + return rv; + } + + file.swap(*_retval); + return NS_OK; +} + +void +CacheFileContextEvictor::CreateIterators() +{ + LOG(("CacheFileContextEvictor::CreateIterators() [this=%p]", this)); + + CloseIterators(); + + nsresult rv; + + for (uint32_t i = 0; i < mEntries.Length(); ) { + rv = CacheIndex::GetIterator(mEntries[i]->mInfo, false, + getter_AddRefs(mEntries[i]->mIterator)); + if (NS_FAILED(rv)) { + LOG(("CacheFileContextEvictor::CreateIterators() - Cannot get an iterator" + ". [rv=0x%08x]", rv)); + mEntries.RemoveElementAt(i); + continue; + } + + ++i; + } +} + +void +CacheFileContextEvictor::CloseIterators() +{ + LOG(("CacheFileContextEvictor::CloseIterators() [this=%p]", this)); + + for (uint32_t i = 0; i < mEntries.Length(); ++i) { + if (mEntries[i]->mIterator) { + mEntries[i]->mIterator->Close(); + mEntries[i]->mIterator = nullptr; + } + } +} + +void +CacheFileContextEvictor::StartEvicting() +{ + LOG(("CacheFileContextEvictor::StartEvicting() [this=%p]", this)); + + MOZ_ASSERT(CacheFileIOManager::IsOnIOThread()); + + if (mEvicting) { + LOG(("CacheFileContextEvictor::StartEvicting() - already evicintg.")); + return; + } + + if (mEntries.Length() == 0) { + LOG(("CacheFileContextEvictor::StartEvicting() - no context to evict.")); + return; + } + + nsCOMPtr<nsIRunnable> ev; + ev = NewRunnableMethod(this, &CacheFileContextEvictor::EvictEntries); + + RefPtr<CacheIOThread> ioThread = CacheFileIOManager::IOThread(); + + nsresult rv = ioThread->Dispatch(ev, CacheIOThread::EVICT); + if (NS_FAILED(rv)) { + LOG(("CacheFileContextEvictor::StartEvicting() - Cannot dispatch event to " + "IO thread. [rv=0x%08x]", rv)); + } + + mEvicting = true; +} + +nsresult +CacheFileContextEvictor::EvictEntries() +{ + LOG(("CacheFileContextEvictor::EvictEntries()")); + + nsresult rv; + + MOZ_ASSERT(CacheFileIOManager::IsOnIOThread()); + + mEvicting = false; + + if (!mIndexIsUpToDate) { + LOG(("CacheFileContextEvictor::EvictEntries() - Stopping evicting due to " + "outdated index.")); + return NS_OK; + } + + while (true) { + if (CacheObserver::ShuttingDown()) { + LOG(("CacheFileContextEvictor::EvictEntries() - Stopping evicting due to " + "shutdown.")); + mEvicting = true; // We don't want to start eviction again during shutdown + // process. Setting this flag to true ensures it. + return NS_OK; + } + + if (CacheIOThread::YieldAndRerun()) { + LOG(("CacheFileContextEvictor::EvictEntries() - Breaking loop for higher " + "level events.")); + mEvicting = true; + return NS_OK; + } + + if (mEntries.Length() == 0) { + LOG(("CacheFileContextEvictor::EvictEntries() - Stopping evicting, there " + "is no context to evict.")); + + // Allow index to notify AsyncGetDiskConsumption callbacks. The size is + // actual again. + CacheIndex::OnAsyncEviction(false); + return NS_OK; + } + + SHA1Sum::Hash hash; + rv = mEntries[0]->mIterator->GetNextHash(&hash); + if (rv == NS_ERROR_NOT_AVAILABLE) { + LOG(("CacheFileContextEvictor::EvictEntries() - No more entries left in " + "iterator. [iterator=%p, info=%p]", mEntries[0]->mIterator.get(), + mEntries[0]->mInfo.get())); + RemoveEvictInfoFromDisk(mEntries[0]->mInfo, mEntries[0]->mPinned); + mEntries.RemoveElementAt(0); + continue; + } else if (NS_FAILED(rv)) { + LOG(("CacheFileContextEvictor::EvictEntries() - Iterator failed to " + "provide next hash (shutdown?), keeping eviction info on disk." + " [iterator=%p, info=%p]", mEntries[0]->mIterator.get(), + mEntries[0]->mInfo.get())); + mEntries.RemoveElementAt(0); + continue; + } + + LOG(("CacheFileContextEvictor::EvictEntries() - Processing hash. " + "[hash=%08x%08x%08x%08x%08x, iterator=%p, info=%p]", LOGSHA1(&hash), + mEntries[0]->mIterator.get(), mEntries[0]->mInfo.get())); + + RefPtr<CacheFileHandle> handle; + CacheFileIOManager::gInstance->mHandles.GetHandle(&hash, + getter_AddRefs(handle)); + if (handle) { + // We doom any active handle in CacheFileIOManager::EvictByContext(), so + // this must be a new one. Skip it. + LOG(("CacheFileContextEvictor::EvictEntries() - Skipping entry since we " + "found an active handle. [handle=%p]", handle.get())); + continue; + } + + CacheIndex::EntryStatus status; + bool pinned; + rv = CacheIndex::HasEntry(hash, &status, &pinned); + // This must never fail, since eviction (this code) happens only when the index + // is up-to-date and thus the informatin is known. + MOZ_ASSERT(NS_SUCCEEDED(rv)); + + if (pinned != mEntries[0]->mPinned) { + LOG(("CacheFileContextEvictor::EvictEntries() - Skipping entry since pinning " + "doesn't match [evicting pinned=%d, entry pinned=%d]", + mEntries[0]->mPinned, pinned)); + continue; + } + + nsAutoCString leafName; + CacheFileIOManager::HashToStr(&hash, leafName); + + PRTime lastModifiedTime; + nsCOMPtr<nsIFile> file; + rv = mEntriesDir->Clone(getter_AddRefs(file)); + if (NS_SUCCEEDED(rv)) { + rv = file->AppendNative(leafName); + } + if (NS_SUCCEEDED(rv)) { + rv = file->GetLastModifiedTime(&lastModifiedTime); + } + if (NS_FAILED(rv)) { + LOG(("CacheFileContextEvictor::EvictEntries() - Cannot get last modified " + "time, skipping entry.")); + continue; + } + + if (lastModifiedTime > mEntries[0]->mTimeStamp) { + LOG(("CacheFileContextEvictor::EvictEntries() - Skipping newer entry. " + "[mTimeStamp=%lld, lastModifiedTime=%lld]", mEntries[0]->mTimeStamp, + lastModifiedTime)); + continue; + } + + LOG(("CacheFileContextEvictor::EvictEntries - Removing entry.")); + file->Remove(false); + CacheIndex::RemoveEntry(&hash); + } + + NS_NOTREACHED("We should never get here"); + return NS_OK; +} + +} // namespace net +} // namespace mozilla |