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/*
* Copyright 2019 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef TEST_LOGGING_LOG_WRITER_H_
#define TEST_LOGGING_LOG_WRITER_H_
#include <stdarg.h>
#include <memory>
#include <string>
#include <utility>
#include "absl/strings/string_view.h"
#include "api/rtc_event_log_output.h"
#include "rtc_base/strings/string_builder.h"
namespace webrtc {
template <class... Args>
inline void LogWriteFormat(RtcEventLogOutput* out_, const char* fmt, ...) {
va_list args, copy;
va_start(args, fmt);
va_copy(copy, args);
const int predicted_length = std::vsnprintf(nullptr, 0, fmt, copy);
va_end(copy);
RTC_DCHECK_GE(predicted_length, 0);
std::string out_str(predicted_length, '\0');
if (predicted_length > 0) {
// Pass "+ 1" to vsnprintf to include space for the '\0'.
const int actual_length =
std::vsnprintf(&out_str.front(), predicted_length + 1, fmt, args);
RTC_DCHECK_GE(actual_length, 0);
}
va_end(args);
out_->Write(out_str);
}
class LogWriterFactoryInterface {
public:
virtual std::unique_ptr<RtcEventLogOutput> Create(
absl::string_view filename) = 0;
virtual ~LogWriterFactoryInterface() = default;
};
class LogWriterFactoryAddPrefix : public LogWriterFactoryInterface {
public:
LogWriterFactoryAddPrefix(LogWriterFactoryInterface* base,
absl::string_view prefix);
std::unique_ptr<RtcEventLogOutput> Create(
absl::string_view filename) override;
private:
LogWriterFactoryInterface* const base_factory_;
const std::string prefix_;
};
} // namespace webrtc
#endif // TEST_LOGGING_LOG_WRITER_H_