72 lines
2.0 KiB
C
72 lines
2.0 KiB
C
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//
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// Copyright (C) 2022 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#pragma once
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#include <shared_mutex>
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#include <thread>
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#include <unordered_map>
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#include <android-base/logging.h>
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#include <fruit/fruit.h>
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#include "common/libs/fs/shared_fd.h"
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namespace cuttlefish {
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/** Per-thread logging state manager class. */
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class ServerLogger {
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public:
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/**
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* Thread-specific logger instance.
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*
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* When a `LOG(severity)` message is written on the same thread where this
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* object was created, the message will be sent to the file descriptor stored
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* in this object.
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*/
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class ScopedLogger {
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public:
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friend ServerLogger;
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ScopedLogger(ScopedLogger&&) noexcept;
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~ScopedLogger();
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private:
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ScopedLogger(ServerLogger&, SharedFD target);
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/** Callback for `LOG(severity)` messages */
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void LogMessage(android::base::LogId log_buffer_id,
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android::base::LogSeverity severity, const char* tag,
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const char* file, unsigned int line, const char* message);
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ServerLogger& server_logger_;
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SharedFD target_;
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};
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INJECT(ServerLogger());
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~ServerLogger();
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/**
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* Configure `LOG(severity)` messages to write to the given file descriptor
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* for the lifetime of the returned object.
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*/
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ScopedLogger LogThreadToFd(SharedFD);
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private:
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std::shared_mutex thread_loggers_lock_;
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std::unordered_map<std::thread::id, ScopedLogger*> thread_loggers_;
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};
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} // namespace cuttlefish
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