webrtc/talk/examples/chat/consoletask.cc

/*
 * libjingle
 * Copyright 2004--2013, Google Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  1. Redistributions of source code must retain the above copyright notice,
 *     this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright notice,
 *     this list of conditions and the following disclaimer in the documentation
 *     and/or other materials provided with the distribution.
 *  3. The name of the author may not be used to endorse or promote products
 *     derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

// TODO(pmclean): Perhaps this should be unified with examples/call/console.cc
// and refactor to talk/base.
#include "talk/examples/chat/consoletask.h"

#define _CRT_SECURE_NO_DEPRECATE 1

#include <stdarg.h>
#ifdef POSIX
#include <signal.h>
#include <termios.h>
#include <unistd.h>
#endif  // POSIX
#include <cassert>

#include "talk/base/logging.h"

#ifdef POSIX
static void DoNothing(int unused) {}
#endif

namespace buzz {

ConsoleTask::ConsoleTask(talk_base::Thread *thread) :
  client_thread_(thread),
  console_thread_(new talk_base::Thread()) {
}

ConsoleTask::~ConsoleTask() {
  Stop();
}

void ConsoleTask::Start() {
  if (!console_thread_) {
    // stdin was closed in Stop(), so we can't restart.
    LOG(LS_ERROR) << "Cannot re-start";
    return;
  }
  if (console_thread_->started()) {
    LOG(LS_WARNING) << "Already started";
    return;
  }
  console_thread_->Start();
  console_thread_->Post(this, MSG_START);
}

void ConsoleTask::Stop() {
  if (console_thread_ && console_thread_->started()) {
#ifdef WIN32
    CloseHandle(GetStdHandle(STD_INPUT_HANDLE));
#else
    close(fileno(stdin));
    // This forces the read() in fgets() to return with errno = EINTR. fgets()
    // will retry the read() and fail, thus returning.
    pthread_kill(console_thread_->GetPThread(), SIGUSR1);
#endif
    console_thread_->Stop();
    console_thread_.reset();
  }
}

void ConsoleTask::SetEcho(bool on) {
#ifdef WIN32
  HANDLE hIn = GetStdHandle(STD_INPUT_HANDLE);
  if ((hIn == INVALID_HANDLE_VALUE) || (hIn == NULL))
    return;

  DWORD mode;
  if (!GetConsoleMode(hIn, &mode))
    return;

  if (on) {
    mode = mode | ENABLE_ECHO_INPUT;
  } else {
    mode = mode & ~ENABLE_ECHO_INPUT;
  }

  SetConsoleMode(hIn, mode);
#else  // MAC & LINUX
  const int fd = fileno(stdin);
  if (fd == -1) {
    return;
  }

  struct termios tcflags;
  if (tcgetattr(fd, &tcflags) == -1) {
    return;
  }

  if (on) {
    tcflags.c_lflag |= ECHO;
  } else {
    tcflags.c_lflag &= ~ECHO;
  }

  tcsetattr(fd, TCSANOW, &tcflags);
#endif
}

void ConsoleTask::Print(const char* format, ...) {
  va_list ap;
  va_start(ap, format);

  char buf[4096];
  int size = vsnprintf(buf, sizeof(buf), format, ap);
  assert(size >= 0);
  assert(size < static_cast<int>(sizeof(buf)));
  buf[size] = '\0';
  printf("%s", buf);
  fflush(stdout);

  va_end(ap);
}

void ConsoleTask::RunConsole() {
  char input_buffer[128];
  while (fgets(input_buffer, sizeof(input_buffer), stdin) != NULL) {
    client_thread_->Post(this, MSG_INPUT,
        new talk_base::TypedMessageData<std::string>(input_buffer));
  }
}

void ConsoleTask::OnMessage(talk_base::Message *msg) {
  switch (msg->message_id) {
    case MSG_START:
#ifdef POSIX
      // Install a no-op signal so that we can abort RunConsole() by raising
      // SIGUSR1.
      struct sigaction act;
      act.sa_handler = &DoNothing;
      sigemptyset(&act.sa_mask);
      act.sa_flags = 0;
      if (sigaction(SIGUSR1, &act, NULL) < 0) {
        LOG(LS_WARNING) << "Can't install signal";
      }
#endif
      RunConsole();
      break;

    case MSG_INPUT:
      talk_base::TypedMessageData<std::string> *data =
          static_cast<talk_base::TypedMessageData<std::string>*>(msg->pdata);
      // Trim off the .line-terminator to make processing easier.
      std::string parsed_message =
        data->data().substr(0, data->data().length() - 1);
      TextInputHandler(parsed_message);
      break;
  }
}

}  // namespace buzz