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606 lines
17 KiB
606 lines
17 KiB
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#include <deque>
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#include <errno.h>
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#include <stdio.h>
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#include "base/at_exit.h"
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#include "base/file_path.h"
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#include "base/file_util.h"
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#include "base/lazy_instance.h"
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#include "base/message_loop.h"
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#include "base/platform_file.h"
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#include "base/process_util.h"
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#include "base/ref_counted.h"
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#include "base/synchronization/lock.h"
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#include "base/sys_info.h"
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#include "base/task.h"
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#include "base/threading/platform_thread.h"
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#include "base/threading/thread.h"
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#include "base/utf_string_conversions.h"
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#include "include/env.h"
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#include "include/slice.h"
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#include "port/port.h"
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#include "util/logging.h"
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#if defined(OS_WIN)
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#include <io.h>
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#include "base/win/win_util.h"
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#endif
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#if defined(OS_MACOSX) || defined(OS_WIN)
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// The following are glibc-specific
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extern "C" {
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size_t fread_unlocked(void *ptr, size_t size, size_t n, FILE *file) {
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return fread(ptr, size, n, file);
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}
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size_t fwrite_unlocked(const void *ptr, size_t size, size_t n, FILE *file) {
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return fwrite(ptr, size, n, file);
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}
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int fflush_unlocked(FILE *file) {
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return fflush(file);
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}
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int fdatasync(int fildes) {
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#if defined(OS_WIN)
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return _commit(fildes);
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#else
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return fsync(fildes);
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#endif
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}
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}
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#endif
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namespace leveldb {
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namespace {
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class Thread;
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::FilePath CreateFilePath(const std::string& file_path) {
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#if defined(OS_WIN)
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return FilePath(UTF8ToUTF16(file_path));
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#else
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return FilePath(file_path);
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#endif
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}
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std::string FilePathToString(const ::FilePath& file_path) {
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#if defined(OS_WIN)
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return UTF16ToUTF8(file_path.value());
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#else
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return file_path.value();
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#endif
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}
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// TODO(jorlow): This should be moved into Chromium's base.
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const char* PlatformFileErrorString(const ::base::PlatformFileError& error) {
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switch (error) {
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case ::base::PLATFORM_FILE_ERROR_FAILED:
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return "Opening file failed.";
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case ::base::PLATFORM_FILE_ERROR_IN_USE:
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return "File currently in use.";
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case ::base::PLATFORM_FILE_ERROR_EXISTS:
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return "File already exists.";
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case ::base::PLATFORM_FILE_ERROR_NOT_FOUND:
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return "File not found.";
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case ::base::PLATFORM_FILE_ERROR_ACCESS_DENIED:
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return "Access denied.";
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case ::base::PLATFORM_FILE_ERROR_TOO_MANY_OPENED:
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return "Too many files open.";
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case ::base::PLATFORM_FILE_ERROR_NO_MEMORY:
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return "Out of memory.";
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case ::base::PLATFORM_FILE_ERROR_NO_SPACE:
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return "No space left on drive.";
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case ::base::PLATFORM_FILE_ERROR_NOT_A_DIRECTORY:
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return "Not a directory.";
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case ::base::PLATFORM_FILE_ERROR_INVALID_OPERATION:
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return "Invalid operation.";
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case ::base::PLATFORM_FILE_ERROR_SECURITY:
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return "Security error.";
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case ::base::PLATFORM_FILE_ERROR_ABORT:
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return "File operation aborted.";
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case ::base::PLATFORM_FILE_ERROR_NOT_A_FILE:
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return "The supplied path was not a file.";
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case ::base::PLATFORM_FILE_ERROR_NOT_EMPTY:
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return "The file was not empty.";
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}
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NOTIMPLEMENTED();
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return "Unknown error.";
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}
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class ChromiumSequentialFile: public SequentialFile {
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private:
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std::string filename_;
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FILE* file_;
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public:
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ChromiumSequentialFile(const std::string& fname, FILE* f)
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: filename_(fname), file_(f) { }
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virtual ~ChromiumSequentialFile() { fclose(file_); }
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virtual Status Read(size_t n, Slice* result, char* scratch) {
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Status s;
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size_t r = fread_unlocked(scratch, 1, n, file_);
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*result = Slice(scratch, r);
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if (r < n) {
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if (feof(file_)) {
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// We leave status as ok if we hit the end of the file
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} else {
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// A partial read with an error: return a non-ok status
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s = Status::IOError(filename_, strerror(errno));
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}
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}
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return s;
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}
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};
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class ChromiumRandomAccessFile: public RandomAccessFile {
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private:
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std::string filename_;
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uint64_t size_;
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::base::PlatformFile file_;
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public:
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ChromiumRandomAccessFile(const std::string& fname, uint64_t size,
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::base::PlatformFile file)
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: filename_(fname), size_(size), file_(file) { }
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virtual ~ChromiumRandomAccessFile() { ::base::ClosePlatformFile(file_); }
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virtual uint64_t Size() const { return size_; }
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virtual Status Read(uint64_t offset, size_t n, Slice* result,
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char* scratch) const {
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Status s;
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int r = ::base::ReadPlatformFile(file_, offset, scratch, n);
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*result = Slice(scratch, (r < 0) ? 0 : r);
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if (r < 0) {
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// An error: return a non-ok status
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s = Status::IOError(filename_, "Could not preform read");
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}
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return s;
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}
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};
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class ChromiumWritableFile : public WritableFile {
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private:
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std::string filename_;
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FILE* file_;
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public:
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ChromiumWritableFile(const std::string& fname, FILE* f)
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: filename_(fname), file_(f) { }
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~ChromiumWritableFile() {
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if (file_ != NULL) {
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// Ignoring any potential errors
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fclose(file_);
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}
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}
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virtual Status Append(const Slice& data) {
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size_t r = fwrite_unlocked(data.data(), 1, data.size(), file_);
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Status result;
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if (r != data.size()) {
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result = Status::IOError(filename_, strerror(errno));
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}
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return result;
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}
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virtual Status Close() {
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Status result;
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if (fclose(file_) != 0) {
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result = Status::IOError(filename_, strerror(errno));
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}
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file_ = NULL;
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return result;
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}
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virtual Status Flush() {
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Status result;
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if (fflush_unlocked(file_) != 0) {
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result = Status::IOError(filename_, strerror(errno));
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}
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return result;
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}
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virtual Status Sync() {
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Status result;
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if ((fflush_unlocked(file_) != 0) ||
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(fdatasync(fileno(file_)) != 0)) {
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result = Status::IOError(filename_, strerror(errno));
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}
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return result;
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}
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};
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class ChromiumFileLock : public FileLock {
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public:
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::base::PlatformFile file_;
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};
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class ChromiumEnv : public Env {
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public:
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ChromiumEnv();
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virtual ~ChromiumEnv() {
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fprintf(stderr, "Destroying Env::Default()\n");
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exit(1);
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}
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virtual Status NewSequentialFile(const std::string& fname,
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SequentialFile** result) {
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FILE* f = fopen(fname.c_str(), "rb");
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if (f == NULL) {
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*result = NULL;
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return Status::IOError(fname, strerror(errno));
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} else {
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*result = new ChromiumSequentialFile(fname, f);
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return Status::OK();
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}
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}
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virtual Status NewRandomAccessFile(const std::string& fname,
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RandomAccessFile** result) {
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int flags = ::base::PLATFORM_FILE_READ | ::base::PLATFORM_FILE_OPEN;
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bool created;
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::base::PlatformFileError error_code;
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::base::PlatformFile file = ::base::CreatePlatformFile(
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CreateFilePath(fname), flags, &created, &error_code);
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if (error_code != ::base::PLATFORM_FILE_OK) {
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*result = NULL;
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return Status::IOError(fname, PlatformFileErrorString(error_code));
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}
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::base::PlatformFileInfo info;
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if (!::base::GetPlatformFileInfo(file, &info)) {
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*result = NULL;
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::base::ClosePlatformFile(file);
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return Status::IOError(fname, PlatformFileErrorString(error_code));
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}
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*result = new ChromiumRandomAccessFile(fname, info.size, file);
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return Status::OK();
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}
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virtual Status NewWritableFile(const std::string& fname,
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WritableFile** result) {
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*result = NULL;
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FILE* f = fopen(fname.c_str(), "wb");
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if (f == NULL) {
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return Status::IOError(fname, strerror(errno));
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} else {
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*result = new ChromiumWritableFile(fname, f);
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return Status::OK();
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}
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}
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virtual bool FileExists(const std::string& fname) {
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return ::file_util::PathExists(CreateFilePath(fname));
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}
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virtual Status GetChildren(const std::string& dir,
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std::vector<std::string>* result) {
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result->clear();
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::file_util::FileEnumerator iter(
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CreateFilePath(dir), false, ::file_util::FileEnumerator::FILES);
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::FilePath current = iter.Next();
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while (!current.empty()) {
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result->push_back(FilePathToString(current.BaseName()));
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current = iter.Next();
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}
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// TODO(jorlow): Unfortunately, the FileEnumerator swallows errors, so
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// we'll always return OK. Maybe manually check for error
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// conditions like the file not existing?
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return Status::OK();
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}
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virtual Status DeleteFile(const std::string& fname) {
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Status result;
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// TODO(jorlow): Should we assert this is a file?
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if (!::file_util::Delete(CreateFilePath(fname), false)) {
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result = Status::IOError(fname, "Could not delete file.");
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}
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return result;
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};
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virtual Status CreateDir(const std::string& name) {
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Status result;
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if (!::file_util::CreateDirectory(CreateFilePath(name))) {
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result = Status::IOError(name, "Could not create directory.");
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}
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return result;
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};
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virtual Status DeleteDir(const std::string& name) {
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Status result;
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// TODO(jorlow): Should we assert this is a directory?
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if (!::file_util::Delete(CreateFilePath(name), false)) {
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result = Status::IOError(name, "Could not delete directory.");
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}
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return result;
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};
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virtual Status GetFileSize(const std::string& fname, uint64_t* size) {
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Status s;
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int64 signed_size;
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if (!::file_util::GetFileSize(CreateFilePath(fname), &signed_size)) {
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*size = 0;
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s = Status::IOError(fname, "Could not determine file size.");
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} else {
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*size = static_cast<uint64_t>(signed_size);
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}
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return s;
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}
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virtual Status RenameFile(const std::string& src, const std::string& dst) {
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Status result;
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if (!::file_util::ReplaceFile(CreateFilePath(src), CreateFilePath(dst))) {
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result = Status::IOError(src, "Could not rename file.");
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}
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return result;
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}
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virtual Status LockFile(const std::string& fname, FileLock** lock) {
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*lock = NULL;
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Status result;
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int flags = ::base::PLATFORM_FILE_OPEN_ALWAYS |
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::base::PLATFORM_FILE_READ |
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::base::PLATFORM_FILE_WRITE |
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::base::PLATFORM_FILE_EXCLUSIVE_READ |
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::base::PLATFORM_FILE_EXCLUSIVE_WRITE;
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bool created;
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::base::PlatformFileError error_code;
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::base::PlatformFile file = ::base::CreatePlatformFile(
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CreateFilePath(fname), flags, &created, &error_code);
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if (error_code != ::base::PLATFORM_FILE_OK) {
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result = Status::IOError(fname, PlatformFileErrorString(error_code));
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} else {
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ChromiumFileLock* my_lock = new ChromiumFileLock;
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my_lock->file_ = file;
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*lock = my_lock;
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}
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return result;
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}
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virtual Status UnlockFile(FileLock* lock) {
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ChromiumFileLock* my_lock = reinterpret_cast<ChromiumFileLock*>(lock);
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Status result;
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if (!::base::ClosePlatformFile(my_lock->file_)) {
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result = Status::IOError("Could not close lock file.");
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}
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delete my_lock;
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return result;
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}
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virtual void Schedule(void (*function)(void*), void* arg);
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virtual void StartThread(void (*function)(void* arg), void* arg);
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virtual std::string UserIdentifier() {
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#if defined(OS_WIN)
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std::wstring user_sid;
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bool ret = ::base::win::GetUserSidString(&user_sid);
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DCHECK(ret);
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return UTF16ToUTF8(user_sid);
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#else
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char buf[100];
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snprintf(buf, sizeof(buf), "%d", int(geteuid()));
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return buf;
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#endif
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}
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virtual Status GetTestDirectory(std::string* path) {
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if (test_directory_.empty()) {
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if (!::file_util::CreateNewTempDirectory("leveldb-", &test_directory_)) {
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return Status::IOError("Could not create temp directory.");
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}
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}
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*path = FilePathToString(test_directory_);
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return Status::OK();
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}
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virtual void Logv(WritableFile* info_log, const char* format, va_list ap) {
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// TODO(jorlow): We may want to just use Chromium's built in logging.
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uint64_t thread_id = 0;
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// Coppied from base/logging.cc.
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#if defined(OS_WIN)
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thread_id = GetCurrentThreadId();
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#elif defined(OS_MACOSX)
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thread_id = mach_thread_self();
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#elif defined(OS_LINUX)
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thread_id = syscall(__NR_gettid);
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#elif defined(OS_FREEBSD) || defined(OS_NACL)
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// TODO(BSD): find a better thread ID
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pthread_t tid = pthread_self();
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memcpy(&thread_id, &tid, min(sizeof(r), sizeof(tid)));
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#endif
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// We try twice: the first time with a fixed-size stack allocated buffer,
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// and the second time with a much larger dynamically allocated buffer.
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char buffer[500];
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for (int iter = 0; iter < 2; iter++) {
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char* base;
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int bufsize;
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if (iter == 0) {
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bufsize = sizeof(buffer);
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base = buffer;
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} else {
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bufsize = 30000;
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base = new char[bufsize];
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}
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char* p = base;
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char* limit = base + bufsize;
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::base::Time::Exploded t;
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::base::Time::Now().LocalExplode(&t);
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p += snprintf(p, limit - p,
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"%04d/%02d/%02d-%02d:%02d:%02d.%06d %llx ",
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t.year,
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t.month,
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t.day_of_month,
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t.hour,
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t.minute,
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t.second,
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static_cast<int>(t.millisecond) * 1000,
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static_cast<long long unsigned int>(thread_id));
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// Print the message
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if (p < limit) {
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va_list backup_ap;
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va_copy(backup_ap, ap);
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p += vsnprintf(p, limit - p, format, backup_ap);
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va_end(backup_ap);
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}
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// Truncate to available space if necessary
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if (p >= limit) {
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if (iter == 0) {
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continue; // Try again with larger buffer
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} else {
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p = limit - 1;
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}
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}
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// Add newline if necessary
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if (p == base || p[-1] != '\n') {
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*p++ = '\n';
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}
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assert(p <= limit);
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info_log->Append(Slice(base, p - base));
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info_log->Flush();
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if (base != buffer) {
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delete[] base;
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}
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break;
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}
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}
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virtual int AppendLocalTimeToBuffer(char* buffer, size_t size) {
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::base::Time::Exploded t;
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::base::Time::Now().LocalExplode(&t);
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return snprintf(buffer, size,
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"%04d/%02d/%02d-%02d:%02d:%02d.%06d",
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t.year,
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t.month,
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t.day_of_month,
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t.hour,
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t.minute,
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t.second,
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static_cast<int>(t.millisecond) * 1000);
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}
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virtual uint64_t NowMicros() {
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return ::base::TimeTicks::HighResNow().ToInternalValue();
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}
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virtual void SleepForMicroseconds(int micros) {
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// Round up to the next millisecond.
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::base::PlatformThread::Sleep((micros + 999) / 1000);
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}
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private:
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// BGThread() is the body of the background thread
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void BGThread();
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static void BGThreadWrapper(void* arg) {
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reinterpret_cast<ChromiumEnv*>(arg)->BGThread();
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}
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FilePath test_directory_;
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size_t page_size_;
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::base::Lock mu_;
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::base::ConditionVariable bgsignal_;
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bool started_bgthread_;
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// Entry per Schedule() call
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struct BGItem { void* arg; void (*function)(void*); };
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typedef std::deque<BGItem> BGQueue;
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BGQueue queue_;
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};
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ChromiumEnv::ChromiumEnv()
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: page_size_(::base::SysInfo::VMAllocationGranularity()),
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bgsignal_(&mu_),
|
|
started_bgthread_(false) {
|
|
#if defined(OS_MACOSX)
|
|
::base::EnableTerminationOnHeapCorruption();
|
|
::base::EnableTerminationOnOutOfMemory();
|
|
#endif // OS_MACOSX
|
|
}
|
|
|
|
class Thread : public ::base::PlatformThread::Delegate {
|
|
public:
|
|
Thread(void (*function)(void* arg), void* arg)
|
|
: function_(function), arg_(arg) {
|
|
::base::PlatformThreadHandle handle;
|
|
bool success = ::base::PlatformThread::Create(0, this, &handle);
|
|
DCHECK(success);
|
|
}
|
|
virtual ~Thread() {}
|
|
virtual void ThreadMain() {
|
|
(*function_)(arg_);
|
|
delete this;
|
|
}
|
|
|
|
private:
|
|
void (*function_)(void* arg);
|
|
void* arg_;
|
|
};
|
|
|
|
void ChromiumEnv::Schedule(void (*function)(void*), void* arg) {
|
|
mu_.Acquire();
|
|
|
|
// Start background thread if necessary
|
|
if (!started_bgthread_) {
|
|
started_bgthread_ = true;
|
|
StartThread(&ChromiumEnv::BGThreadWrapper, this);
|
|
}
|
|
|
|
// If the queue is currently empty, the background thread may currently be
|
|
// waiting.
|
|
if (queue_.empty()) {
|
|
bgsignal_.Signal();
|
|
}
|
|
|
|
// Add to priority queue
|
|
queue_.push_back(BGItem());
|
|
queue_.back().function = function;
|
|
queue_.back().arg = arg;
|
|
|
|
mu_.Release();
|
|
}
|
|
|
|
void ChromiumEnv::BGThread() {
|
|
while (true) {
|
|
// Wait until there is an item that is ready to run
|
|
mu_.Acquire();
|
|
while (queue_.empty()) {
|
|
bgsignal_.Wait();
|
|
}
|
|
|
|
void (*function)(void*) = queue_.front().function;
|
|
void* arg = queue_.front().arg;
|
|
queue_.pop_front();
|
|
|
|
mu_.Release();
|
|
(*function)(arg);
|
|
}
|
|
}
|
|
|
|
void ChromiumEnv::StartThread(void (*function)(void* arg), void* arg) {
|
|
new Thread(function, arg); // Will self-delete.
|
|
}
|
|
|
|
::base::LazyInstance<ChromiumEnv, ::base::LeakyLazyInstanceTraits<ChromiumEnv> >
|
|
default_env(::base::LINKER_INITIALIZED);
|
|
|
|
}
|
|
|
|
Env* Env::Default() {
|
|
return default_env.Pointer();
|
|
}
|
|
|
|
}
|