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// Copyright (c) 2013 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
#ifndef THIRD_PARTY_LEVELDATABASE_ENV_CHROMIUM_H_
#define THIRD_PARTY_LEVELDATABASE_ENV_CHROMIUM_H_
#include <deque>
#include <set>
#include <string>
#include <vector>
#include "base/files/file.h"
#include "base/files/file_path.h"
#include "base/metrics/histogram.h"
#include "leveldb/env.h"
#include "port/port_chromium.h"
#include "util/mutexlock.h"
namespace leveldb_env {
// These entries map to values in tools/metrics/histograms/histograms.xml. New
// values should be appended at the end.
enum MethodID {
kSequentialFileRead,
kSequentialFileSkip,
kRandomAccessFileRead,
kWritableFileAppend,
kWritableFileClose,
kWritableFileFlush,
kWritableFileSync,
kNewSequentialFile,
kNewRandomAccessFile,
kNewWritableFile,
kDeleteFile,
kCreateDir,
kDeleteDir,
kGetFileSize,
kRenameFile,
kLockFile,
kUnlockFile,
kGetTestDirectory,
kNewLogger,
kSyncParent,
kGetChildren,
kNewAppendableFile,
kNumEntries
};
const char* MethodIDToString(MethodID method);
leveldb::Status MakeIOError(leveldb::Slice filename,
const std::string& message,
MethodID method,
base::File::Error error);
leveldb::Status MakeIOError(leveldb::Slice filename,
const std::string& message,
MethodID method);
enum ErrorParsingResult {
METHOD_ONLY,
METHOD_AND_PFE,
METHOD_AND_ERRNO,
NONE,
};
ErrorParsingResult ParseMethodAndError(const leveldb::Status& status,
MethodID* method,
int* error);
int GetCorruptionCode(const leveldb::Status& status);
int GetNumCorruptionCodes();
std::string GetCorruptionMessage(const leveldb::Status& status);
bool IndicatesDiskFull(const leveldb::Status& status);
class UMALogger {
public:
virtual void RecordErrorAt(MethodID method) const = 0;
virtual void RecordOSError(MethodID method,
base::File::Error error) const = 0;
virtual void RecordBackupResult(bool success) const = 0;
};
class RetrierProvider {
public:
virtual int MaxRetryTimeMillis() const = 0;
virtual base::HistogramBase* GetRetryTimeHistogram(MethodID method) const = 0;
virtual base::HistogramBase* GetRecoveredFromErrorHistogram(
MethodID method) const = 0;
};
class WriteTracker {
public:
virtual void DidCreateNewFile(const std::string& fname) = 0;
virtual bool DoesDirNeedSync(const std::string& fname) = 0;
virtual void DidSyncDir(const std::string& fname) = 0;
};
class ChromiumEnv : public leveldb::Env,
public UMALogger,
public RetrierProvider,
public WriteTracker {
public:
ChromiumEnv();
typedef void(ScheduleFunc)(void*);
static bool MakeBackup(const std::string& fname);
virtual ~ChromiumEnv();
virtual bool FileExists(const std::string& fname);
virtual leveldb::Status GetChildren(const std::string& dir,
std::vector<std::string>* result);
virtual leveldb::Status DeleteFile(const std::string& fname);
virtual leveldb::Status CreateDir(const std::string& name);
virtual leveldb::Status DeleteDir(const std::string& name);
virtual leveldb::Status GetFileSize(const std::string& fname, uint64_t* size);
virtual leveldb::Status RenameFile(const std::string& src,
const std::string& dst);
virtual leveldb::Status LockFile(const std::string& fname,
leveldb::FileLock** lock);
virtual leveldb::Status UnlockFile(leveldb::FileLock* lock);
virtual void Schedule(ScheduleFunc*, void* arg);
virtual void StartThread(void (*function)(void* arg), void* arg);
virtual leveldb::Status GetTestDirectory(std::string* path);
virtual uint64_t NowMicros();
virtual void SleepForMicroseconds(int micros);
virtual leveldb::Status NewSequentialFile(const std::string& fname,
leveldb::SequentialFile** result);
virtual leveldb::Status NewRandomAccessFile(
const std::string& fname,
leveldb::RandomAccessFile** result);
virtual leveldb::Status NewWritableFile(const std::string& fname,
leveldb::WritableFile** result);
virtual leveldb::Status NewAppendableFile(const std::string& fname,
leveldb::WritableFile** result);
virtual leveldb::Status NewLogger(const std::string& fname,
leveldb::Logger** result);
protected:
virtual void DidSyncDir(const std::string& fname);
std::string name_;
bool make_backup_;
private:
static const char* FileErrorString(base::File::Error error);
virtual void DidCreateNewFile(const std::string& fname);
virtual bool DoesDirNeedSync(const std::string& fname);
virtual void RecordErrorAt(MethodID method) const;
virtual void RecordOSError(MethodID method,
base::File::Error error) const;
void RecordOpenFilesLimit(const std::string& type);
base::HistogramBase* GetMaxFDHistogram(const std::string& type) const;
base::HistogramBase* GetOSErrorHistogram(MethodID method, int limit) const;
// File locks may not be exclusive within a process (e.g. on POSIX). Track
// locks held by the ChromiumEnv to prevent access within the process.
class LockTable {
public:
bool Insert(const std::string& fname) {
leveldb::MutexLock l(&mu_);
return locked_files_.insert(fname).second;
}
bool Remove(const std::string& fname) {
leveldb::MutexLock l(&mu_);
return locked_files_.erase(fname) == 1;
}
private:
leveldb::port::Mutex mu_;
std::set<std::string> locked_files_;
};
std::set<std::string> directories_needing_sync_;
base::Lock directory_sync_lock_;
const int kMaxRetryTimeMillis;
// BGThread() is the body of the background thread
void BGThread();
static void BGThreadWrapper(void* arg) {
reinterpret_cast<ChromiumEnv*>(arg)->BGThread();
}
virtual void RecordBackupResult(bool result) const;
void RestoreIfNecessary(const std::string& dir,
std::vector<std::string>* children);
base::FilePath RestoreFromBackup(const base::FilePath& base_name);
void RecordLockFileAncestors(int num_missing_ancestors) const;
base::HistogramBase* GetMethodIOErrorHistogram() const;
base::HistogramBase* GetLockFileAncestorHistogram() const;
// RetrierProvider implementation.
virtual int MaxRetryTimeMillis() const { return kMaxRetryTimeMillis; }
virtual base::HistogramBase* GetRetryTimeHistogram(MethodID method) const;
virtual base::HistogramBase* GetRecoveredFromErrorHistogram(
MethodID method) const;
base::FilePath test_directory_;
base::Lock mu_;
base::ConditionVariable bgsignal_;
bool started_bgthread_;
// Entry per Schedule() call
struct BGItem {
void* arg;
void (*function)(void*);
};
typedef std::deque<BGItem> BGQueue;
BGQueue queue_;
LockTable locks_;
};
} // namespace leveldb_env
#endif // THIRD_PARTY_LEVELDATABASE_ENV_CHROMIUM_H_
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