android_sink.h
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// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
// Distributed under the MIT License (http://opensource.org/licenses/MIT)
#pragma once
#ifdef __ANDROID__
#include <spdlog/details/fmt_helper.h>
#include <spdlog/details/null_mutex.h>
#include <spdlog/details/os.h>
#include <spdlog/sinks/base_sink.h>
#include <spdlog/details/synchronous_factory.h>
#include <android/log.h>
#include <chrono>
#include <mutex>
#include <string>
#include <thread>
#if !defined(SPDLOG_ANDROID_RETRIES)
#define SPDLOG_ANDROID_RETRIES 2
#endif
namespace spdlog {
namespace sinks {
/*
* Android sink (logging using __android_log_write)
*/
template<typename Mutex>
class android_sink final : public base_sink<Mutex>
{
public:
explicit android_sink(std::string tag = "spdlog", bool use_raw_msg = false)
: tag_(std::move(tag))
, use_raw_msg_(use_raw_msg)
{}
protected:
void sink_it_(const details::log_msg &msg) override
{
const android_LogPriority priority = convert_to_android_(msg.level);
memory_buf_t formatted;
if (use_raw_msg_)
{
details::fmt_helper::append_string_view(msg.payload, formatted);
}
else
{
base_sink<Mutex>::formatter_->format(msg, formatted);
}
formatted.push_back('\0');
const char *msg_output = formatted.data();
// See system/core/liblog/logger_write.c for explanation of return value
int ret = __android_log_write(priority, tag_.c_str(), msg_output);
int retry_count = 0;
while ((ret == -11 /*EAGAIN*/) && (retry_count < SPDLOG_ANDROID_RETRIES))
{
details::os::sleep_for_millis(5);
ret = __android_log_write(priority, tag_.c_str(), msg_output);
retry_count++;
}
if (ret < 0)
{
throw_spdlog_ex("__android_log_write() failed", ret);
}
}
void flush_() override {}
private:
static android_LogPriority convert_to_android_(spdlog::level::level_enum level)
{
switch (level)
{
case spdlog::level::trace:
return ANDROID_LOG_VERBOSE;
case spdlog::level::debug:
return ANDROID_LOG_DEBUG;
case spdlog::level::info:
return ANDROID_LOG_INFO;
case spdlog::level::warn:
return ANDROID_LOG_WARN;
case spdlog::level::err:
return ANDROID_LOG_ERROR;
case spdlog::level::critical:
return ANDROID_LOG_FATAL;
default:
return ANDROID_LOG_DEFAULT;
}
}
std::string tag_;
bool use_raw_msg_;
};
using android_sink_mt = android_sink<std::mutex>;
using android_sink_st = android_sink<details::null_mutex>;
} // namespace sinks
// Create and register android syslog logger
template<typename Factory = spdlog::synchronous_factory>
inline std::shared_ptr<logger> android_logger_mt(const std::string &logger_name, const std::string &tag = "spdlog")
{
return Factory::template create<sinks::android_sink_mt>(logger_name, tag);
}
template<typename Factory = spdlog::synchronous_factory>
inline std::shared_ptr<logger> android_logger_st(const std::string &logger_name, const std::string &tag = "spdlog")
{
return Factory::template create<sinks::android_sink_st>(logger_name, tag);
}
} // namespace spdlog
#endif // __ANDROID__