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62 lines
2.0 KiB
C++
62 lines
2.0 KiB
C++
// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
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// Distributed under the MIT License (http://opensource.org/licenses/MIT)
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#pragma once
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#include "spdlog/details/circular_q.h"
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#include "spdlog/details/log_msg_buffer.h"
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#include "spdlog/details/null_mutex.h"
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#include "spdlog/sinks/base_sink.h"
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#include <functional>
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#include <mutex>
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#include <string>
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#include <vector>
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namespace spdlog {
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namespace sinks {
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/*
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* Ring buffer sink. Holds fixed amount of log messages in memory. When the buffer is full, new messages override the
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* old ones. Useful for storing debug data in memory in case of error. Example: auto rb_sink =
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* std::make_shared<spdlog::sinks::ringbuffer_sink_mt>(128); spdlog::logger logger("rb_logger", rb_sink);
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* rb->drain([](const std::string_view msg) { process(msg);});
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*/
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template <typename Mutex>
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class ringbuffer_sink final : public base_sink<Mutex> {
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public:
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explicit ringbuffer_sink(size_t n_items)
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: q_{n_items} {}
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void drain_raw(std::function<void(const details::log_msg_buffer &)> callback) {
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std::lock_guard<Mutex> lock(base_sink<Mutex>::mutex_);
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while (!q_.empty()) {
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callback(q_.front());
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q_.pop_front();
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}
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}
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void drain(std::function<void(std::string_view)> callback) {
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std::lock_guard<Mutex> lock(base_sink<Mutex>::mutex_);
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memory_buf_t formatted;
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while (!q_.empty()) {
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formatted.clear();
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base_sink<Mutex>::formatter_->format(q_.front(), formatted);
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callback(std::string_view(formatted.data(), formatted.size()));
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q_.pop_front();
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}
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}
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protected:
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void sink_it_(const details::log_msg &msg) override { q_.push_back(details::log_msg_buffer{msg}); }
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void flush_() override {}
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private:
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details::circular_q<details::log_msg_buffer> q_;
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};
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using ringbuffer_sink_mt = ringbuffer_sink<std::mutex>;
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using ringbuffer_sink_st = ringbuffer_sink<details::null_mutex>;
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} // namespace sinks
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} // namespace spdlog
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