logmeow/logcat_thread.cpp

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#include <cstring>
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#include <fcntl.h>
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#include <unistd.h>
#include <sys/epoll.h>
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#include <system_error>
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#include "log.h"
#include "misc.h"
#include "logcat_thread.h"
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#include "logcat_entry.h"
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#define EPOLL_MAX_EVENTS 10
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static void mark_nonblock(int fd) {
int flags = fcntl(fd, F_GETFL);
if (flags < 0) {
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throw_system_error("fcntl(fd, F_GETFL)");
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}
if (!(flags & O_NONBLOCK) && fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1) {
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throw_system_error("fcntl(fd, F_SETFL)");
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}
}
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static inline void look_for_newlines(char buf[NEWLINE_BUF_SIZE], size_t* used, size_t previous_used,
void(LogcatThread::*handle_line)(char*, size_t, bool), LogcatThread* logcat_thread, bool is_stdout) {
size_t search_offset = previous_used;
size_t real_offset = 0;
while (*used > search_offset) {
char* newline_ptr = static_cast<char*>(memchr(&buf[search_offset], '\n', (*used - search_offset) * sizeof(char)));
if (!newline_ptr) {
break;
}
size_t newline_length = (reinterpret_cast<size_t>(newline_ptr) - reinterpret_cast<size_t>(&buf[real_offset])) / sizeof(char);
(logcat_thread->*handle_line)(&buf[real_offset], newline_length, is_stdout);
real_offset += newline_length + 1;
search_offset = real_offset;
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}
if (real_offset) {
if (*used > search_offset) {
memcpy(buf, &buf[real_offset], (*used - real_offset) * sizeof(char));
*used -= real_offset;
} else {
*used = 0;
}
}
}
static inline void handle_fd(int fd, char* buf, size_t* used,
void(LogcatThread::*handle_line)(char*, size_t, bool), LogcatThread* logcat_thread, bool is_stdout) {
while (true) {
ssize_t read_size_u = read(fd, &buf[*used], (NEWLINE_BUF_SIZE - *used) * sizeof(char));
if (read_size_u == 0) {
return;
} else if (read_size_u < 0 && (errno == EAGAIN || errno == EWOULDBLOCK)) {
return;
} else if (read_size_u < 0) {
throw_system_error("read()");
}
size_t read_size = static_cast<size_t>(read_size_u) / sizeof(char);
if (*used + read_size > NEWLINE_BUF_SIZE) {
throw std::runtime_error("Received line longer than 512k");
}
size_t previous_used = *used;
*used += read_size;
look_for_newlines(buf, used, previous_used, handle_line, logcat_thread, is_stdout);
}
}
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LogcatThread::LogcatThread() {
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int fds[2];
struct epoll_event event = {.events = EPOLLIN | EPOLLET};
if (pipe(fds)) {
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int errsv = errno;
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this->~LogcatThread();
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throw_system_error(errsv, "pipe() for stdout");
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}
this->_stdout_read_fd = fds[0];
this->_stdout_write_fd = fds[1];
try {
mark_nonblock(this->_stdout_read_fd);
} catch (const std::exception& e) {
this->~LogcatThread();
throw;
}
if (pipe(fds)) {
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int errsv = errno;
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this->~LogcatThread();
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throw_system_error(errsv, "pipe() for stderr");
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}
this->_stderr_read_fd = fds[0];
this->_stderr_write_fd = fds[1];
try {
mark_nonblock(this->_stderr_read_fd);
} catch (const std::exception& e) {
this->~LogcatThread();
throw;
}
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this->_epoll_fd = epoll_create1(EPOLL_CLOEXEC);
if (this->_epoll_fd == -1) {
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int errsv = errno;
this->~LogcatThread();
throw_system_error(errsv, "epoll_create1()");
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}
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event.data.fd = this->_stdout_read_fd;
if (epoll_ctl(this->_epoll_fd, EPOLL_CTL_ADD, this->_stdout_read_fd, &event)) {
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int errsv = errno;
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this->~LogcatThread();
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throw_system_error(errsv, "epoll_ctl() for stdout");
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}
event.data.fd = this->_stderr_read_fd;
if (epoll_ctl(this->_epoll_fd, EPOLL_CTL_ADD, this->_stderr_read_fd, &event)) {
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int errsv = errno;
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this->~LogcatThread();
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throw_system_error(errsv, "epoll_ctl() for stderr");
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}
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this->_thread = std::thread(&LogcatThread::_run, this, this->_stop_source.get_token());
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}
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LogcatThread::~LogcatThread() {
if (this->_epoll_fd != -1 && close(this->_epoll_fd)) {
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log(std::string("Failed to close epoll file descriptor: close(): ") + strerror(errno));
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}
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if (this->_stdout_read_fd != -1 && close(this->_stdout_read_fd)) {
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log(std::string("Failed to close stdout read pipe: close(): ") + strerror(errno));
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}
if (this->_stdout_write_fd != -1 && close(this->_stdout_write_fd)) {
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log(std::string("Failed to close stdout write pipe: close(): ") + strerror(errno));
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}
if (this->_stderr_read_fd != -1 && close(this->_stderr_read_fd)) {
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log(std::string("Failed to close stderr read pipe: close(): ") + strerror(errno));
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}
if (this->_stderr_write_fd != -1 && close(this->_stderr_write_fd)) {
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log(std::string("Failed to close stderr write pipe: close(): ") + strerror(errno));
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}
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}
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void LogcatThread::request_stop() {
this->_stop_source.request_stop();
}
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void LogcatThread::join() {
this->_thread.join();
}
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void LogcatThread::_handle_line(char* buf, size_t length, bool is_stdout) {
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if (!is_stdout) {
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std::string log_entry = format_log(std::string("Received from logcat stderr: ") + std::string(buf, length));
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printf("%s\n", log_entry.c_str());
this->atomic_ring_buffer.put_and_increment_write(std::move(log_entry));
return;
}
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std::optional<LogcatEntry> logcat_entry;
try {
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logcat_entry = try_parse_logcat_entry(buf, length, this->_current_buffer);
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} catch (const std::exception& e) {
std::string log_entry = format_log(std::string("Failed to parse logcat entry: ") + e.what());
printf("%s\n", log_entry.c_str());
this->atomic_ring_buffer.put_and_increment_write(std::move(log_entry));
}
if (logcat_entry) {
this->atomic_ring_buffer.put_and_increment_write(std::move(*logcat_entry));
return;
}
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std::optional<Buffer> new_buffer;
try {
new_buffer = try_parse_buffer(buf, length);
} catch (const std::exception& e) {
std::string log_entry = format_log(std::string("Failed to parse buffer line: ") + e.what());
printf("%s\n", log_entry.c_str());
this->atomic_ring_buffer.put_and_increment_write(std::move(log_entry));
}
if (new_buffer) {
this->_current_buffer = *new_buffer;
return;
}
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std::string log_entry = format_log(std::string("Cannot parse logcat stdout: ") + std::string(buf, length));
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printf("%s\n", log_entry.c_str());
this->atomic_ring_buffer.put_and_increment_write(std::move(log_entry));
}
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void LogcatThread::_run(std::stop_token stoken) {
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struct epoll_event events[EPOLL_MAX_EVENTS];
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while (!stoken.stop_requested()) {
#ifndef NDEBUG
if (this->debug_log_request.test()) {
this->atomic_ring_buffer.put_and_increment_write(format_log("A log entry from the logcat thread :D"));
this->debug_log_request.clear();
}
#endif
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int ready_fds = epoll_wait(this->_epoll_fd, events, EPOLL_MAX_EVENTS, 1000);
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if (ready_fds == -1) {
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std::string log_entry = format_log(std::string("epoll_wait(): ") + strerror(errno));
printf("%s\n", log_entry.c_str());
this->atomic_ring_buffer.put_and_increment_write(std::move(log_entry));
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break;
}
for (int i=0; i < ready_fds; i++) {
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const bool is_stdout = events[i].data.fd == this->_stdout_read_fd;
char* buf = is_stdout ? this->_stdout_buf : this->_stderr_buf;
size_t* used = is_stdout ? &this->_stdout_buf_used : &this->_stderr_buf_used;
try {
handle_fd(events[i].data.fd, buf, used, &LogcatThread::_handle_line, this, is_stdout);
} catch (const std::exception& e) {
std::string log_entry = "Failed to handle std";
log_entry += is_stdout ? "out: " : "err: ";
log_entry += e.what();
log_entry = format_log(std::move(log_entry));
printf("%s\n", log_entry.c_str());
this->atomic_ring_buffer.put_and_increment_write(std::move(log_entry));
}
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}
}
}