79 lines
2.3 KiB
C++
79 lines
2.3 KiB
C++
// Copyright 2019 The Crashpad Authors
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
#ifndef CRASHPAD_UTIL_STREAM_LOG_OUTPUT_STREAM_H_
|
|
#define CRASHPAD_UTIL_STREAM_LOG_OUTPUT_STREAM_H_
|
|
|
|
#include <stddef.h>
|
|
#include <stdint.h>
|
|
|
|
#include <memory>
|
|
#include <string>
|
|
|
|
#include "util/stream/output_stream_interface.h"
|
|
|
|
namespace crashpad {
|
|
|
|
//! \brief This class outputs a stream of data as a series of log messages.
|
|
class LogOutputStream : public OutputStreamInterface {
|
|
public:
|
|
//! \brief An interface to a log output sink.
|
|
class Delegate {
|
|
public:
|
|
Delegate() = default;
|
|
virtual ~Delegate() = default;
|
|
|
|
//! \brief Logs |buf| to the output sink.
|
|
//!
|
|
//! \param buf the buffer to write to the log. More bytes than are in |buf|
|
|
//! may be written, e.g. to convey metadata.
|
|
//! \return the number of bytes written, or a negative error code.
|
|
virtual int Log(const char* buf) = 0;
|
|
|
|
//! \brief Returns the maximum number of bytes to allow writing to this log.
|
|
virtual size_t OutputCap() = 0;
|
|
|
|
//! \brief Returns the maximum length of buffers allowed to be passed to
|
|
//! Log().
|
|
virtual size_t LineWidth() = 0;
|
|
};
|
|
|
|
explicit LogOutputStream(std::unique_ptr<Delegate> delegate);
|
|
|
|
LogOutputStream(const LogOutputStream&) = delete;
|
|
LogOutputStream& operator=(const LogOutputStream&) = delete;
|
|
|
|
~LogOutputStream() override;
|
|
|
|
// OutputStreamInterface:
|
|
bool Write(const uint8_t* data, size_t size) override;
|
|
bool Flush() override;
|
|
|
|
private:
|
|
// Flushes buffer_, returning false on failure.
|
|
bool WriteBuffer();
|
|
|
|
int WriteToLog(const char* buf);
|
|
|
|
std::string buffer_;
|
|
std::unique_ptr<Delegate> delegate_;
|
|
size_t output_count_;
|
|
bool flush_needed_;
|
|
bool flushed_;
|
|
};
|
|
|
|
} // namespace crashpad
|
|
|
|
#endif // CRASHPAD_UTIL_STREAM_LOG_OUTPUT_STREAM_H_
|