Python Django源码运行过程解析_python_

def main(): os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'testDjango.settings') try: from django.core.management import execute_from_command_line except ImportError as exc: --- execute_from_command_line(sys.argv)

def execute_from_command_line(argv=None): utility = ManagementUtility(argv) utility.execute()

 def execute(self): --- if subcommand == 'help': --- elif subcommand == 'version' or self.argv[1:] == ['--version']: sys.stdout.write(django.get_version() + '\n') elif self.argv[1:] in (['--help'], ['-h']): sys.stdout.write(self.main_help_text() + '\n') else: self.fetch_command(subcommand).run_from_argv(self.argv)

 def run_from_argv(self, argv): self._called_from_command_line = True parser = self.create_parser(argv[0], argv[1]) options = parser.parse_args(argv[2:]) cmd_options = vars(options) args = cmd_options.pop('args', ()) handle_default_options(options) try: self.execute(*args, **cmd_options) except CommandError as e: ---

 def handle(self, *args, **options): if not settings.DEBUG and not settings.ALLOWED_HOSTS: raise CommandError('You must set settings.ALLOWED_HOSTS if DEBUG is False.') self.use_ipv6 = options['use_ipv6'] if self.use_ipv6 and not socket.has_ipv6: raise CommandError('Your Python does not support IPv6.') self._raw_ipv6 = False if not options['addrport']: --- else: --- if not self.addr: self.addr = self.default_addr_ipv6 if self.use_ipv6 else self.default_addr self._raw_ipv6 = self.use_ipv6 self.run(**options) 

 def run(self, **options): use_reloader = options['use_reloader'] if use_reloader: autoreload.run_with_reloader(self.inner_run, **options) else: self.inner_run(None, **options) 

 def inner_run(self, *args, **options): --- try: handler = self.get_handler(*args, **options) run(self.addr, int(self.port), handler, ipv6=self.use_ipv6, threading=threading, server_cls=self.server_cls) except OSError as e: --- 

def run(addr, port, wsgi_handler, ipv6=False, threading=False, server_cls=WSGIServer): server_address = (addr, port) if threading: httpd_cls = type('WSGIServer', (socketserver.ThreadingMixIn, server_cls), {}) else: httpd_cls = server_cls httpd = httpd_cls(server_address, WSGIRequestHandler, ipv6=ipv6) if threading: httpd.daemon_threads = True httpd.set_app(wsgi_handler) httpd.serve_forever()

def run(addr, port, wsgi_handler, ipv6=False, threading=False, server_cls=WSGIServer): --- httpd.set_app(wsgi_handler) httpd.serve_forever() 

 def serve_forever(self, poll_interval=0.5): self.__is_shut_down.clear() try: with _ServerSelector() as selector: selector.register(self, selectors.EVENT_READ) while not self.__shutdown_request: ready = selector.select(poll_interval) if self.__shutdown_request: break if ready: self._handle_request_noblock() self.service_actions() ---

 def _handle_request_noblock(self): try: request, client_address = self.get_request() except OSError: return if self.verify_request(request, client_address): try: self.process_request(request, client_address) except Exception: self.handle_error(request, client_address) self.shutdown_request(request) except: self.shutdown_request(request) raise else: self.shutdown_request(request)

 def process_request(self, request, client_address): """Start a new thread to process the request.""" t = threading.Thread(target = self.process_request_thread, args = (request, client_address)) t.daemon = self.daemon_threads if not t.daemon and self.block_on_close: if self._threads is None: self._threads = [] self._threads.append(t) t.start() 

 def process_request_thread(self, request, client_address): """Same as in BaseServer but as a thread. In addition, exception handling is done here. """ try: self.finish_request(request, client_address) except Exception: self.handle_error(request, client_address) finally: self.shutdown_request(request) 

class BaseServer: timeout = None def __init__(self, server_address, RequestHandlerClass): """Constructor. May be extended, do not override.""" self.server_address = server_address self.RequestHandlerClass = RequestHandlerClass self.__is_shut_down = threading.Event(
                
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