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/*
* Copyright (C) 2020 The Android Open Source Project
*
* 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.
*/
#pragma once
#include <sys/types.h>
#include <functional>
#include <log/log.h>
#include <log/log_read.h>
#include "LogWriter.h"
// A mask to represent which log buffers a reader is watching, values are (1 << LOG_ID_MAIN), etc.
using LogMask = uint32_t;
constexpr uint32_t kLogMaskAll = 0xFFFFFFFF;
// State that a LogBuffer may want to persist across calls to FlushTo().
class FlushToState {
public:
FlushToState(uint64_t start, LogMask log_mask) : start_(start), log_mask_(log_mask) {}
virtual ~FlushToState() {}
uint64_t start() const { return start_; }
void set_start(uint64_t start) { start_ = start; }
LogMask log_mask() const { return log_mask_; }
private:
uint64_t start_;
LogMask log_mask_;
};
// Enum for the return values of the `filter` function passed to FlushTo().
enum class FilterResult {
kSkip,
kStop,
kWrite,
};
class LogBuffer {
public:
virtual ~LogBuffer() {}
virtual void Init() = 0;
virtual int Log(log_id_t log_id, log_time realtime, uid_t uid, pid_t pid, pid_t tid,
const char* msg, uint16_t len) = 0;
virtual std::unique_ptr<FlushToState> CreateFlushToState(uint64_t start, LogMask log_mask) = 0;
virtual bool FlushTo(
LogWriter* writer, FlushToState& state,
const std::function<FilterResult(log_id_t log_id, pid_t pid, uint64_t sequence,
log_time realtime)>& filter) = 0;
virtual bool Clear(log_id_t id, uid_t uid) = 0;
virtual size_t GetSize(log_id_t id) = 0;
virtual bool SetSize(log_id_t id, size_t size) = 0;
virtual uint64_t sequence() const = 0;
};
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