Question

我想构建一个简单的服务器，该服务器根据请求的路径调度请求。所以我写了以下代码：

from http.server import HTTPServer, BaseHTTPRequestHandler
import json
import socket

class Handler:
    """处理对应资源的请求"""
    def __init__(self, dispatcher):
        self.dispatcher = dispatcher

    def handle(self):
        """根据dispatcher解析出来的path，调用对应的方法"""
        command = 'do_' + self.dispatcher.command
        print(command)
        if not hasattr(self, command):
            return;

        method = getattr(self, command)
        method(self)

    def do_GET(self):
        response = {
            'message': 'message'
        }
        dispatcher.protocol_version = 'HTTP/1.1'
        dispatcher.send_response(200, 'OK')
        dispatcher.send_header('Content-type', 'text/plain')
        dispatcher.wfile.write(bytes(json.dumps(response), 'utf-8'))

class dispatcher(BaseHTTPRequestHandler):
    """
    根据url的不同分发请求
    """
    def handle_one_request(self):
        try:
            self.raw_requestline = self.rfile.readline(65537)
            if len(self.raw_requestline) > 65536:
                self.requestline = ''
                self.request_version = ''
                self.command = ''
                self.send_error(HTTPStatus.REQUEST_URI_TOO_LONG)
                return
            if not self.raw_requestline:
                self.close_connection = True
                return
            if not self.parse_request():
                # An error code has been sent, just exit
                return
            print(self.command)
            print(self.path)
            if self.path.startswith('/wrong'):
                Handler(self).handle()
            self.wfile.flush() #actually send the response if not already done.
        except socket.timeout as e:
            #a read or a write timed out.  Discard this connection
            self.log_error("Request timed out: %r", e)
            self.close_connection = True
            return

if __name__ == '__main__':
    server = HTTPServer(('', 8080), dispatcher)
    server.serve_forever()

dispatcher将解析传入的请求并获取路径，以便它可以决定要调用哪个处理程序（尽管目前只有一个）。

在handler类中，它将基于http方法调用相应的方法。在do_GET方法中，它将在调度程序中调用某些方法，这就是问题所在。

运行该程序并执行curl http://localhost:8080/wrong时，出现以下异常：

GET
/wrong
do_GET
----------------------------------------
Exception happened during processing of request from ('127.0.0.1', 50072)
Traceback (most recent call last):
  File "/usr/lib/python3.5/socketserver.py", line 313, in _handle_request_noblock
    self.process_request(request, client_address)
  File "/usr/lib/python3.5/socketserver.py", line 341, in process_request
    self.finish_request(request, client_address)
  File "/usr/lib/python3.5/socketserver.py", line 354, in finish_request
    self.RequestHandlerClass(request, client_address, self)
  File "/usr/lib/python3.5/socketserver.py", line 681, in __init__
    self.handle()
  File "/usr/lib/python3.5/http/server.py", line 422, in handle
    self.handle_one_request()
  File "hello.py", line 51, in handle_one_request
    Handler(self).handle()
  File "hello.py", line 18, in handle
    method()
  File "hello.py", line 25, in do_GET
    dispatcher.send_response(200, 'OK')
  File "/usr/lib/python3.5/http/server.py", line 487, in send_response
    self.log_request(code)
AttributeError: 'int' object has no attribute 'log_request'
----------------------------------------

log_request在dispatcher的超类中定义如下：

def log_request(self, code='-', size='-'):
    # blablabla

，它在dispatcher.send_response中被调用。

我想问题是解释器将200视为self。

如果我的猜测是正确的，为什么会这样？

如果不是，是什么原因导致此异常？

我知道这个问题仍然在语法层面，但是如果有人可以帮助我，我将不胜感激。

int在python3中被视为`self'

0 个答案: