logmeow/logcat_thread.h

#pragma once

#include <thread>
#include <variant>
#include "arb.h"
#include "logcat_entry.h"

typedef std::variant<std::string, LogcatEntry> LogcatThreadItem;
#define NEWLINE_BUF_SIZE 512 * 1024

class LogcatThread {
public:
    // https://stackoverflow.com/a/2173764
    LogcatThread(const LogcatThread&) = delete;
    LogcatThread& operator=(const LogcatThread&) = delete;

    LogcatThread();
    ~LogcatThread();
    void request_stop();
    void join();

    AtomicRingBuffer<LogcatThreadItem> atomic_ring_buffer;

#ifndef NDEBUG
    std::atomic_flag debug_log_request;
#endif

private:
    void _put_if_not_stopped(LogcatThreadItem item);
    void _handle_line(char* buf, size_t length, bool is_stdout);
    void _run_epoll_round();
    void _run(std::stop_token stoken);

    int _epoll_fd = -1;
    int _stdout_read_fd = -1;
    int _stdout_write_fd = -1;
    int _stderr_read_fd = -1;
    int _stderr_write_fd = -1;
    char _stdout_buf[NEWLINE_BUF_SIZE];
    size_t _stdout_buf_used = 0;
    char _stderr_buf[NEWLINE_BUF_SIZE];
    size_t _stderr_buf_used = 0;
    Buffer _current_buffer = Buffer::Unknown;
    std::stop_source _stop_source;
    std::thread _thread;
};