174 lines
6.3 KiB
C
174 lines
6.3 KiB
C
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/*
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* Copyright 2015 The WebRTC Project Authors. All rights reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef WEBRTC_BASE_FILEROTATINGSTREAM_H_
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#define WEBRTC_BASE_FILEROTATINGSTREAM_H_
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#include <memory>
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#include <string>
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#include <vector>
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#include "webrtc/base/constructormagic.h"
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#include "webrtc/base/stream.h"
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namespace rtc {
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// FileRotatingStream writes to a file in the directory specified in the
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// constructor. It rotates the files once the current file is full. The
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// individual file size and the number of files used is configurable in the
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// constructor. Open() must be called before using this stream.
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class FileRotatingStream : public StreamInterface {
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public:
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// Use this constructor for reading a directory previously written to with
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// this stream.
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FileRotatingStream(const std::string& dir_path,
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const std::string& file_prefix);
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// Use this constructor for writing to a directory. Files in the directory
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// matching the prefix will be deleted on open.
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FileRotatingStream(const std::string& dir_path,
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const std::string& file_prefix,
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size_t max_file_size,
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size_t num_files);
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~FileRotatingStream() override;
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// StreamInterface methods.
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StreamState GetState() const override;
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StreamResult Read(void* buffer,
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size_t buffer_len,
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size_t* read,
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int* error) override;
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StreamResult Write(const void* data,
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size_t data_len,
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size_t* written,
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int* error) override;
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bool Flush() override;
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// Returns the total file size currently used on disk.
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bool GetSize(size_t* size) const override;
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void Close() override;
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// Opens the appropriate file(s). Call this before using the stream.
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bool Open();
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// Disabling buffering causes writes to block until disk is updated. This is
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// enabled by default for performance.
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bool DisableBuffering();
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// Returns the path used for the i-th newest file, where the 0th file is the
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// newest file. The file may or may not exist, this is just used for
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// formatting. Index must be less than GetNumFiles().
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std::string GetFilePath(size_t index) const;
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// Returns the number of files that will used by this stream.
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size_t GetNumFiles() { return file_names_.size(); }
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protected:
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size_t GetMaxFileSize() const { return max_file_size_; }
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void SetMaxFileSize(size_t size) { max_file_size_ = size; }
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size_t GetRotationIndex() const { return rotation_index_; }
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void SetRotationIndex(size_t index) { rotation_index_ = index; }
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virtual void OnRotation() {}
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private:
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enum Mode { kRead, kWrite };
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FileRotatingStream(const std::string& dir_path,
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const std::string& file_prefix,
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size_t max_file_size,
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size_t num_files,
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Mode mode);
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bool OpenCurrentFile();
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void CloseCurrentFile();
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// Rotates the files by creating a new current file, renaming the
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// existing files, and deleting the oldest one. e.g.
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// file_0 -> file_1
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// file_1 -> file_2
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// file_2 -> delete
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// create new file_0
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void RotateFiles();
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// Returns a list of file names in the directory beginning with the prefix.
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std::vector<std::string> GetFilesWithPrefix() const;
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// Private version of GetFilePath.
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std::string GetFilePath(size_t index, size_t num_files) const;
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const std::string dir_path_;
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const std::string file_prefix_;
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const Mode mode_;
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// FileStream is used to write to the current file.
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std::unique_ptr<FileStream> file_stream_;
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// Convenience storage for file names so we don't generate them over and over.
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std::vector<std::string> file_names_;
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size_t max_file_size_;
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size_t current_file_index_;
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// The rotation index indicates the index of the file that will be
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// deleted first on rotation. Indices lower than this index will be rotated.
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size_t rotation_index_;
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// Number of bytes written to current file. We need this because with
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// buffering the file size read from disk might not be accurate.
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size_t current_bytes_written_;
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bool disable_buffering_;
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RTC_DISALLOW_COPY_AND_ASSIGN(FileRotatingStream);
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};
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// CallSessionFileRotatingStream is meant to be used in situations where we will
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// have limited disk space. Its purpose is to read and write logs up to a
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// maximum size. Once the maximum size is exceeded, logs from the middle are
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// deleted whereas logs from the beginning and end are preserved. The reason for
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// this is because we anticipate that in WebRTC the beginning and end of the
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// logs are most useful for call diagnostics.
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//
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// This implementation simply writes to a single file until
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// |max_total_log_size| / 2 bytes are written to it, and subsequently writes to
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// a set of rotating files. We do this by inheriting FileRotatingStream and
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// setting the appropriate internal variables so that we don't delete the last
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// (earliest) file on rotate, and that that file's size is bigger.
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//
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// Open() must be called before using this stream.
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class CallSessionFileRotatingStream : public FileRotatingStream {
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public:
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// Use this constructor for reading a directory previously written to with
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// this stream.
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explicit CallSessionFileRotatingStream(const std::string& dir_path);
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// Use this constructor for writing to a directory. Files in the directory
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// matching what's used by the stream will be deleted. |max_total_log_size|
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// must be at least 4.
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CallSessionFileRotatingStream(const std::string& dir_path,
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size_t max_total_log_size);
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~CallSessionFileRotatingStream() override {}
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protected:
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void OnRotation() override;
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private:
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static size_t GetRotatingLogSize(size_t max_total_log_size);
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static size_t GetNumRotatingLogFiles(size_t max_total_log_size);
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static const char* kLogPrefix;
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static const size_t kRotatingLogFileDefaultSize;
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const size_t max_total_log_size_;
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size_t num_rotations_;
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RTC_DISALLOW_COPY_AND_ASSIGN(CallSessionFileRotatingStream);
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};
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} // namespace rtc
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#endif // WEBRTC_BASE_FILEROTATINGSTREAM_H_
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