Unrevert r245135 "Created new Windows LevelDB environment."

third_party/leveldatabase/env_chromium_win.cc

+// 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.
+
+#include "base/debug/trace_event.h"
+#include "base/files/file_path.h"
+#include "base/strings/utf_string_conversions.h"
+#include "base/win/win_util.h"
+#include "chromium_logger.h"
+#include "env_chromium_stdio.h"
+#include "env_chromium_win.h"
+
+using namespace leveldb;
+
+namespace leveldb_env {
+
+namespace {
+
+static std::string GetWindowsErrorMessage(DWORD err) {
+  LPTSTR errorText(NULL);
+  FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER |
+                    FORMAT_MESSAGE_IGNORE_INSERTS,
+                NULL,
+                err,
+                MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
+                (LPTSTR) & errorText,
+                0,
+                NULL);
+  if (errorText != NULL) {
+    std::string message(base::UTF16ToUTF8(errorText));
+    // FormatMessage adds CR/LF to messages so we remove it.
+    TrimWhitespace(message, TRIM_TRAILING, &message);
+    LocalFree(errorText);
+    return message;
+  } else {
+    return std::string();
+  }
+}
+
+class ChromiumSequentialFileWin : public SequentialFile {
+ private:
+  std::string filename_;
+  HANDLE file_;
+  const UMALogger* uma_logger_;
+
+ public:
+  ChromiumSequentialFileWin(const std::string& fname,
+                         HANDLE f,
+                         const UMALogger* uma_logger)
+      : filename_(fname), file_(f), uma_logger_(uma_logger) {
+    DCHECK(file_ != INVALID_HANDLE_VALUE);
+  }
+  virtual ~ChromiumSequentialFileWin() {
+    DCHECK(file_ != INVALID_HANDLE_VALUE);
+    CloseHandle(file_);
+    file_ = INVALID_HANDLE_VALUE;
+  }
+
+  virtual Status Read(size_t n, Slice* result, char* scratch) {
+    Status s;
+    DWORD bytes_read(0);
+    DCHECK(file_ != INVALID_HANDLE_VALUE);
+    if (ReadFile(file_, scratch, n, &bytes_read, NULL)) {
+      *result = Slice(scratch, bytes_read);
+    } else {
+      DWORD err = GetLastError();
+      s = MakeIOErrorWin(
+          filename_, GetWindowsErrorMessage(err), kSequentialFileRead, err);
+      uma_logger_->RecordErrorAt(kSequentialFileRead);
+      if (bytes_read > 0)
+        *result = Slice(scratch, bytes_read);
+    }
+    return s;
+  }
+
+  virtual Status Skip(uint64_t n) {
+    LARGE_INTEGER li;
+    li.QuadPart = n;
+    if (SetFilePointer(file_, li.LowPart, &li.HighPart, FILE_CURRENT) ==
+        INVALID_SET_FILE_POINTER) {
+      DWORD err = GetLastError();
+      uma_logger_->RecordErrorAt(kSequentialFileSkip);
+      return MakeIOErrorWin(
+          filename_, GetWindowsErrorMessage(err), kSequentialFileSkip, err);
+    }
+    return Status::OK();
+  }
+};
+
+class ChromiumRandomAccessFileWin : public RandomAccessFile {
+ private:
+  std::string filename_;
+  ::base::PlatformFile file_;
+  const UMALogger* uma_logger_;
+
+ public:
+  ChromiumRandomAccessFileWin(const std::string& fname,
+                           ::base::PlatformFile file,
+                           const UMALogger* uma_logger)
+      : filename_(fname), file_(file), uma_logger_(uma_logger) {}
+  virtual ~ChromiumRandomAccessFileWin() { ::base::ClosePlatformFile(file_); }
+
+  virtual Status Read(uint64_t offset, size_t n, Slice* result, char* scratch)
+      const {
+    Status s;
+    int r = ::base::ReadPlatformFile(file_, offset, scratch, n);
+    *result = Slice(scratch, (r < 0) ? 0 : r);
+    if (r < 0) {
+      // An error: return a non-ok status
+      s = MakeIOError(
+          filename_, "Could not perform read", kRandomAccessFileRead);
+      uma_logger_->RecordErrorAt(kRandomAccessFileRead);
+    }
+    return s;
+  }
+};
+
+}  // unnamed namespace
+
+Status MakeIOErrorWin(Slice filename,
+                        const std::string& message,
+                        MethodID method,
+                        DWORD error) {
+  char buf[512];
+  if (snprintf(buf,
+               sizeof(buf),
+               "%s (ChromeMethodErrno: %d::%s::%u)",
+               message.c_str(),
+               method,
+               MethodIDToString(method),
+               error) >= 0) {
+    return Status::IOError(filename, buf);
+  } else {
+    return Status::IOError(filename, "<unknown>");
+  }
+}
+
+ChromiumWritableFileWin::ChromiumWritableFileWin(
+    const std::string& fname,
+    HANDLE f,
+    const UMALogger* uma_logger,
+    WriteTracker* tracker,
+    bool make_backup)
+    : filename_(fname),
+      file_(f),
+      uma_logger_(uma_logger),
+      tracker_(tracker),
+      file_type_(kOther),
+      make_backup_(make_backup) {
+  DCHECK(f != INVALID_HANDLE_VALUE);
+  base::FilePath path = base::FilePath::FromUTF8Unsafe(fname);
+  if (FilePathToString(path.BaseName()).find("MANIFEST") == 0)
+    file_type_ = kManifest;
+  else if (ChromiumEnv::HasTableExtension(path))
+    file_type_ = kTable;
+  if (file_type_ != kManifest)
+    tracker_->DidCreateNewFile(filename_);
+  parent_dir_ = FilePathToString(ChromiumEnv::CreateFilePath(fname).DirName());
+}
+
+ChromiumWritableFileWin::~ChromiumWritableFileWin() {
+  if (file_ != INVALID_HANDLE_VALUE) {
+    // Ignoring any potential errors
+
+    CloseHandle(file_);
+    file_ = INVALID_HANDLE_VALUE;
+  }
+}
+
+Status ChromiumWritableFileWin::SyncParent() {
+  // On Windows no need to sync parent directory. It's metadata will be
+  // updated via the creation of the new file, without an explicit sync.
+  return Status();
+}
+
+Status ChromiumWritableFileWin::Append(const Slice& data) {
+  if (file_type_ == kManifest && tracker_->DoesDirNeedSync(filename_)) {
+    Status s = SyncParent();
+    if (!s.ok())
+      return s;
+    tracker_->DidSyncDir(filename_);
+  }
+
+  DWORD written(0);
+  if (!WriteFile(file_, data.data(), data.size(), &written, NULL)) {
+    DWORD err = GetLastError();
+    uma_logger_->RecordOSError(kWritableFileAppend,
+                               base::LastErrorToPlatformFileError(err));
+    return MakeIOErrorWin(
+        filename_, GetWindowsErrorMessage(err), kWritableFileAppend, err);
+  }
+  return Status::OK();
+}
+
+Status ChromiumWritableFileWin::Close() {
+  Status result;
+  DCHECK(file_ != INVALID_HANDLE_VALUE);
+  if (!CloseHandle(file_)) {
+    DWORD err = GetLastError();
+    result = MakeIOErrorWin(
+        filename_, GetWindowsErrorMessage(err), kWritableFileClose, err);
+    uma_logger_->RecordErrorAt(kWritableFileClose);
+  }
+  file_ = INVALID_HANDLE_VALUE;
+  return result;
+}
+
+Status ChromiumWritableFileWin::Flush() {
+  // Windows doesn't use POSIX file streams, so there are no file stream buffers
+  // to flush - this is a no-op.
+  return Status();
+}
+
+Status ChromiumWritableFileWin::Sync() {
+  TRACE_EVENT0("leveldb", "ChromiumEnvWin::Sync");
+  Status result;
+  DWORD error = ERROR_SUCCESS;
+
+  DCHECK(file_ != INVALID_HANDLE_VALUE);
+  if (!FlushFileBuffers(file_))
+    error = GetLastError();
+  if (error != ERROR_SUCCESS) {
+    result = MakeIOErrorWin(
+        filename_, GetWindowsErrorMessage(error), kWritableFileSync, error);
+    uma_logger_->RecordErrorAt(kWritableFileSync);
+  } else if (make_backup_ && file_type_ == kTable) {
+    bool success = ChromiumEnv::MakeBackup(filename_);
+    uma_logger_->RecordBackupResult(success);
+  }
+  return result;
+}
+
+ChromiumEnvWin::ChromiumEnvWin() {}
+
+ChromiumEnvWin::~ChromiumEnvWin() {}
+
+Status ChromiumEnvWin::NewSequentialFile(const std::string& fname,
+                                           SequentialFile** result) {
+  HANDLE f = CreateFile(base::UTF8ToUTF16(fname).c_str(),
+                        GENERIC_READ,
+                        FILE_SHARE_READ,
+                        NULL,
+                        OPEN_EXISTING,
+                        FILE_ATTRIBUTE_NORMAL,
+                        NULL);
+  if (f == INVALID_HANDLE_VALUE) {
+    *result = NULL;
+    DWORD err = GetLastError();
+    RecordOSError(kNewSequentialFile, err);
+    return MakeIOErrorWin(
+        fname, GetWindowsErrorMessage(err), kNewSequentialFile, err);
+  } else {
+    *result = new ChromiumSequentialFileWin(fname, f, this);
+    return Status::OK();
+  }
+}
+
+void ChromiumEnvWin::RecordOpenFilesLimit(const std::string& type) {
+  // The Windows POSIX implementation (which this class doesn't use)
+  // has an open file limit, but when using the Win32 API this is limited by
+  // available memory, so no value to report.
+}
+
+Status ChromiumEnvWin::NewRandomAccessFile(const std::string& fname,
+                                             RandomAccessFile** result) {
+  int flags = ::base::PLATFORM_FILE_READ | ::base::PLATFORM_FILE_OPEN;
+  bool created;
+  ::base::PlatformFileError error_code;
+  ::base::PlatformFile file = ::base::CreatePlatformFile(
+      ChromiumEnv::CreateFilePath(fname), flags, &created, &error_code);
+  if (error_code == ::base::PLATFORM_FILE_OK) {
+    *result = new ChromiumRandomAccessFileWin(fname, file, this);
+    RecordOpenFilesLimit("Success");
+    return Status::OK();
+  }
+  if (error_code == ::base::PLATFORM_FILE_ERROR_TOO_MANY_OPENED)
+    RecordOpenFilesLimit("TooManyOpened");
+  else
+    RecordOpenFilesLimit("OtherError");
+  *result = NULL;
+  RecordOSError(kNewRandomAccessFile, error_code);
+  return MakeIOErrorWin(fname,
+                          PlatformFileErrorString(error_code),
+                          kNewRandomAccessFile,
+                          error_code);
+}
+
+Status ChromiumEnvWin::NewWritableFile(const std::string& fname,
+                                         WritableFile** result) {
+  *result = NULL;
+  HANDLE f = CreateFile(base::UTF8ToUTF16(fname).c_str(),
+                        GENERIC_WRITE,
+                        FILE_SHARE_READ,
+                        NULL,
+                        CREATE_ALWAYS,
+                        FILE_ATTRIBUTE_NORMAL,
+                        NULL);
+  if (f == INVALID_HANDLE_VALUE) {
+    DWORD err = GetLastError();
+    RecordErrorAt(kNewWritableFile);
+    return MakeIOErrorWin(
+        fname, GetWindowsErrorMessage(err), kNewWritableFile, err);
+  } else {
+    *result = new ChromiumWritableFileWin(fname, f, this, this, make_backup_);
+    return Status::OK();
+  }
+}
+
+base::PlatformFileError ChromiumEnvWin::GetDirectoryEntries(
+    const base::FilePath& dir_param,
+    std::vector<base::FilePath>* result) const {
+  result->clear();
+  base::FilePath dir_filepath = dir_param.Append(FILE_PATH_LITERAL("*"));
+  WIN32_FIND_DATA find_data;
+  HANDLE find_handle = FindFirstFile(dir_filepath.value().c_str(), &find_data);
+  if (find_handle == INVALID_HANDLE_VALUE) {
+    DWORD last_error = GetLastError();
+    if (last_error == ERROR_FILE_NOT_FOUND)
+      return base::PLATFORM_FILE_OK;
+    return base::LastErrorToPlatformFileError(last_error);
+  }
+  do {
+    base::FilePath filepath(find_data.cFileName);
+    base::FilePath::StringType basename = filepath.BaseName().value();
+    if (basename == FILE_PATH_LITERAL(".") ||
+        basename == FILE_PATH_LITERAL(".."))
+      continue;
+    result->push_back(filepath.BaseName());
+  } while (FindNextFile(find_handle, &find_data));
+  DWORD last_error = GetLastError();
+  base::PlatformFileError return_value = base::PLATFORM_FILE_OK;
+  if (last_error != ERROR_NO_MORE_FILES)
+    return_value = base::LastErrorToPlatformFileError(last_error);
+  FindClose(find_handle);
+  return return_value;
+}
+
+Status ChromiumEnvWin::NewLogger(const std::string& fname, Logger** result) {
+  FILE* f = _wfopen(base::UTF8ToUTF16(fname).c_str(), L"w");
+  if (f == NULL) {
+    *result = NULL;
+    int saved_errno = errno;
+    RecordOSError(kNewLogger, saved_errno);
+    return MakeIOError(fname, strerror(saved_errno), kNewLogger, saved_errno);
+  } else {
+    *result = new ChromiumLogger(f);
+    return Status::OK();
+  }
+}
+
+void ChromiumEnvWin::RecordOSError(MethodID method, DWORD error) const {
+  RecordErrorAt(method);
+  GetOSErrorHistogram(method, ERANGE + 1)->Add(error);
+}
+
+}  // namespace leveldb_env