使用Python日志套接字处理程序接收到奇怪字符

Question

我在用Python（2.7）写程序，需要把信息记录到一个远程服务器上。我使用了logging.handlers这个库，但发送的信息有点奇怪。目前我在用Python文档网站上提供的SocketServer代码。

import logging
import logging.handlers

class TestMan():
    def __init__(self,xmlString):

        formatter = logging.Formatter('%(levelname)s : %(name)s - %(asctime)s - %(message)s')

        logging.basicConfig(filename='test.log',level=logging.DEBUG,format='%(levelname)s : %(name)s - %(asctime)s - %(message)s')
        log = logging.getLogger(__name__)

        socket = logging.handlers.SocketHandler('localhost',1030)
        socket.setLevel(logging.INFO)
        socket.setFormatter(formatter)

        log.addHandler(socket)
        log.info("Starting Test")

收到的内容如下（不能直接粘贴文本，所以我截图了）

https://i.stack.imgur.com/Z3nZD.png

服务器代码：

import SocketServer

class MyTCPHandler(SocketServer.BaseRequestHandler):
    """
    The RequestHandler class for our server.

    It is instantiated once per connection to the server, and must
    override the handle() method to implement communication to the
    client.
    """

    def handle(self):
        # self.request is the TCP socket connected to the client
        self.data = self.request.recv(1024).strip()
        print "{} wrote:".format(self.client_address[0])
        print self.data
        # just send back the same data, but upper-cased
        self.request.sendall(self.data.upper())

if __name__ == "__main__":
    HOST, PORT = "localhost", 1030

    # Create the server, binding to localhost on port 9999
    server = SocketServer.TCPServer((HOST, PORT), MyTCPHandler)

    # Activate the server; this will keep running until you
    # interrupt the program with Ctrl-C
    server.serve_forever()

Answer 1

SocketHandlers发送的数据在发送之前会被“打包”。

https://docs.python.org/2/library/logging.handlers.html#logging.handlers.SocketHandler

emit()这个函数会把记录的属性字典打包，然后以二进制格式写入到socket中。如果socket出现错误，它会默默地丢弃这个数据包。如果之前的连接断开了，它会重新建立连接。在接收端，要把打包的数据解包成LogRecord，可以使用makeLogRecord()这个函数。