为什么数据在 socket.io 中丢失?

Why is data being lost in socket.io?

我正在构建一个小型应用程序,用于跟踪日志并将其显示在客户端上。但是,当我将行附加到我的日志时,我丢失了一些数据。

这是相关的 Python 处理程序:

@socketio.on('Request logs')
def handle_request_logs():
    logfile = '/path/to/some_log.log'

    # gets last 25 lines from logfile
    last_n_lines = tailer.tail(open(logfile), 25)

    # sends the initial 25 lines
    emit('Initial send', { 'lines' : last_n_lines })

    # emits lines that were appended to logfile
    @copy_current_request_context
    def tail(logfile):
        for line in tailer.follow(open(logfile)):
            print("About to emit {0}".format(line))
            emit('log', { 'line' : line })

    # emit added lines as they come
    t = threading.Thread(target=tail, args=(logfile,))
    t.start()

这是接收 'log':

的 JS
  socket.on('log', function(data) {
      alert("Got some data: ", data['line']);
  });

每当我在日志中附加一些内容(例如 echo 'hello, world!' >> /path/to/some_log.log)时,我都会在客户端上看到一条带有消息的警报 "Got some data: "。但是,我的服务器打印 "About to emit hello, world!".

为什么会这样?

您的提醒中有一个逗号 (javascript)。它可能应该是一个 + 用于连接。