示例#1
0
文件: listener.c 项目: kwlzn/watchman
// The client thread reads and decodes json packets,
// then dispatches the commands that it finds
static void *client_thread(void *ptr)
{
  struct watchman_client *client = ptr;
  struct watchman_event_poll pfd[2];
  json_t *request;
  json_error_t jerr;

  w_stm_set_nonblock(client->stm, true);
  w_set_thread_name("client:stm=%p", client->stm);

  w_stm_get_events(client->stm, &pfd[0].evt);
  pfd[1].evt = client->ping;

  while (!stopping) {
    // Wait for input from either the client socket or
    // via the ping pipe, which signals that some other
    // thread wants to unilaterally send data to the client

    ignore_result(w_poll_events(pfd, 2, 2000));

    if (stopping) {
      break;
    }

    if (pfd[0].ready) {
      request = w_json_buffer_next(&client->reader, client->stm, &jerr);

      if (!request && errno == EAGAIN) {
        // That's fine
      } else if (!request) {
        // Not so cool
        if (client->reader.wpos == client->reader.rpos) {
          // If they disconnected in between PDUs, no need to log
          // any error
          goto disconected;
        }
        send_error_response(client, "invalid json at position %d: %s",
            jerr.position, jerr.text);
        w_log(W_LOG_ERR, "invalid data from client: %s\n", jerr.text);

        goto disconected;
      } else if (request) {
        client->pdu_type = client->reader.pdu_type;
        dispatch_command(client, request, CMD_DAEMON);
        json_decref(request);
      }
    }

    if (pfd[1].ready) {
      w_event_test_and_clear(client->ping);
    }

    /* now send our response(s) */
    while (client->head) {
      struct watchman_client_response *resp;

      /* de-queue the first response */
      pthread_mutex_lock(&w_client_lock);
      resp = client->head;
      if (resp) {
        client->head = resp->next;
        if (client->tail == resp) {
          client->tail = NULL;
        }
      }
      pthread_mutex_unlock(&w_client_lock);

      if (resp) {
        bool ok;

        w_stm_set_nonblock(client->stm, false);

        /* Return the data in the same format that was used to ask for it */
        ok = w_ser_write_pdu(client->pdu_type, &client->writer,
            client->stm, resp->json);

        json_decref(resp->json);
        free(resp);

        w_stm_set_nonblock(client->stm, true);

        if (!ok) {
          break;
        }
      }
    }
  }

disconected:
  pthread_mutex_lock(&w_client_lock);
  w_ht_del(clients, w_ht_ptr_val(client));
  pthread_mutex_unlock(&w_client_lock);

  return NULL;
}
示例#2
0
// The client thread reads and decodes json packets,
// then dispatches the commands that it finds
static void *client_thread(void *ptr)
{
  struct watchman_client *client = ptr;
  struct watchman_event_poll pfd[2];
  struct watchman_client_response *queued_responses_to_send;
  json_t *request;
  json_error_t jerr;
  bool send_ok = true;

  w_stm_set_nonblock(client->stm, true);
  w_set_thread_name("client=%p:stm=%p", client, client->stm);

  client->client_is_owner = w_stm_peer_is_owner(client->stm);

  w_stm_get_events(client->stm, &pfd[0].evt);
  pfd[1].evt = client->ping;

  while (!stopping) {
    // Wait for input from either the client socket or
    // via the ping pipe, which signals that some other
    // thread wants to unilaterally send data to the client

    ignore_result(w_poll_events(pfd, 2, 2000));

    if (stopping) {
      break;
    }

    if (pfd[0].ready) {
      request = w_json_buffer_next(&client->reader, client->stm, &jerr);

      if (!request && errno == EAGAIN) {
        // That's fine
      } else if (!request) {
        // Not so cool
        if (client->reader.wpos == client->reader.rpos) {
          // If they disconnected in between PDUs, no need to log
          // any error
          goto disconected;
        }
        send_error_response(client, "invalid json at position %d: %s",
            jerr.position, jerr.text);
        w_log(W_LOG_ERR, "invalid data from client: %s\n", jerr.text);

        goto disconected;
      } else if (request) {
        client->pdu_type = client->reader.pdu_type;
        dispatch_command(client, request, CMD_DAEMON);
        json_decref(request);
      }
    }

    if (pfd[1].ready) {
      w_event_test_and_clear(client->ping);
    }

    /* de-queue the pending responses under the lock */
    pthread_mutex_lock(&w_client_lock);
    queued_responses_to_send = client->head;
    client->head = NULL;
    client->tail = NULL;
    pthread_mutex_unlock(&w_client_lock);

    /* now send our response(s) */
    while (queued_responses_to_send) {
      struct watchman_client_response *response_to_send =
        queued_responses_to_send;

      if (send_ok) {
        w_stm_set_nonblock(client->stm, false);
        /* Return the data in the same format that was used to ask for it.
         * Don't bother sending any more messages if the client disconnects,
         * but still free their memory.
         */
        send_ok = w_ser_write_pdu(client->pdu_type, &client->writer,
                                  client->stm, response_to_send->json);
        w_stm_set_nonblock(client->stm, true);
      }

      queued_responses_to_send = response_to_send->next;

      json_decref(response_to_send->json);
      free(response_to_send);
    }
  }

disconected:
  w_set_thread_name("NOT_CONN:client=%p:stm=%p", client, client->stm);
  // Remove the client from the map before we tear it down, as this makes
  // it easier to flush out pending writes on windows without worrying
  // about w_log_to_clients contending for the write buffers
  pthread_mutex_lock(&w_client_lock);
  w_ht_del(clients, w_ht_ptr_val(client));
  pthread_mutex_unlock(&w_client_lock);

  client_delete(client);

  return NULL;
}