import errno import os import sys import time import traceback import types import warnings import eventlet from eventlet import greenio from eventlet import support from eventlet.corolocal import local from eventlet.green import BaseHTTPServer from eventlet.green import socket import six from six.moves import urllib DEFAULT_MAX_SIMULTANEOUS_REQUESTS = 1024 DEFAULT_MAX_HTTP_VERSION = 'HTTP/1.1' MAX_REQUEST_LINE = 8192 MAX_HEADER_LINE = 8192 MAX_TOTAL_HEADER_SIZE = 65536 MINIMUM_CHUNK_SIZE = 4096 # %(client_port)s is also available DEFAULT_LOG_FORMAT = ('%(client_ip)s - - [%(date_time)s] "%(request_line)s"' ' %(status_code)s %(body_length)s %(wall_seconds).6f') RESPONSE_414 = b'''HTTP/1.0 414 Request URI Too Long\r\n\ Connection: close\r\n\ Content-Length: 0\r\n\r\n''' is_accepting = True STATE_IDLE = 'idle' STATE_REQUEST = 'request' STATE_CLOSE = 'close' __all__ = ['server', 'format_date_time'] # Weekday and month names for HTTP date/time formatting; always English! _weekdayname = ["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"] _monthname = [None, # Dummy so we can use 1-based month numbers "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"] def format_date_time(timestamp): """Formats a unix timestamp into an HTTP standard string.""" year, month, day, hh, mm, ss, wd, _y, _z = time.gmtime(timestamp) return "%s, %02d %3s %4d %02d:%02d:%02d GMT" % ( _weekdayname[wd], day, _monthname[month], year, hh, mm, ss ) def addr_to_host_port(addr): host = 'unix' port = '' if isinstance(addr, tuple): host = addr[0] port = addr[1] return (host, port) # Collections of error codes to compare against. Not all attributes are set # on errno module on all platforms, so some are literals :( BAD_SOCK = set((errno.EBADF, 10053)) BROKEN_SOCK = set((errno.EPIPE, errno.ECONNRESET)) class ChunkReadError(ValueError): pass WSGI_LOCAL = local() class Input(object): def __init__(self, rfile, content_length, sock, wfile=None, wfile_line=None, chunked_input=False): self.rfile = rfile self._sock = sock if content_length is not None: content_length = int(content_length) self.content_length = content_length self.wfile = wfile self.wfile_line = wfile_line self.position = 0 self.chunked_input = chunked_input self.chunk_length = -1 # (optional) headers to send with a "100 Continue" response. Set by # calling set_hundred_continue_respose_headers() on env['wsgi.input'] self.hundred_continue_headers = None self.is_hundred_continue_response_sent = False # handle_one_response should give us a ref to the response state so we # know whether we can still send the 100 Continue; until then, though, # we're flying blind self.headers_sent = None def send_hundred_continue_response(self): if self.headers_sent: # To late; application has already started sending data back # to the client # TODO: maybe log a warning if self.hundred_continue_headers # is not None? return towrite = [] # 100 Continue status line towrite.append(self.wfile_line) # Optional headers if self.hundred_continue_headers is not None: # 100 Continue headers for header in self.hundred_continue_headers: towrite.append(six.b('%s: %s\r\n' % header)) # Blank line towrite.append(b'\r\n') self.wfile.writelines(towrite) self.wfile.flush() # Reinitialize chunk_length (expect more data) self.chunk_length = -1 @property def should_send_hundred_continue(self): return self.wfile is not None and not self.is_hundred_continue_response_sent def _do_read(self, reader, length=None): if self.should_send_hundred_continue: # 100 Continue response self.send_hundred_continue_response() self.is_hundred_continue_response_sent = True if (self.content_length is not None) and ( length is None or length > self.content_length - self.position): length = self.content_length - self.position if not length: return b'' try: read = reader(length) except greenio.SSL.ZeroReturnError: read = b'' self.position += len(read) return read def _chunked_read(self, rfile, length=None, use_readline=False): if self.should_send_hundred_continue: # 100 Continue response self.send_hundred_continue_response() self.is_hundred_continue_response_sent = True try: if length == 0: return b"" if length and length < 0: length = None if use_readline: reader = self.rfile.readline else: reader = self.rfile.read response = [] while self.chunk_length != 0: maxreadlen = self.chunk_length - self.position if length is not None and length < maxreadlen: maxreadlen = length if maxreadlen > 0: data = reader(maxreadlen) if not data: self.chunk_length = 0 raise IOError("unexpected end of file while parsing chunked data") datalen = len(data) response.append(data) self.position += datalen if self.chunk_length == self.position: rfile.readline() if length is not None: length -= datalen if length == 0: break if use_readline and data[-1:] == b"\n": break else: try: self.chunk_length = int(rfile.readline().split(b";", 1)[0], 16) except ValueError as err: raise ChunkReadError(err) self.position = 0 if self.chunk_length == 0: rfile.readline() except greenio.SSL.ZeroReturnError: pass return b''.join(response) def read(self, length=None): if self.chunked_input: return self._chunked_read(self.rfile, length) return self._do_read(self.rfile.read, length) def readline(self, size=None): if self.chunked_input: return self._chunked_read(self.rfile, size, True) else: return self._do_read(self.rfile.readline, size) def readlines(self, hint=None): if self.chunked_input: lines = [] for line in iter(self.readline, b''): lines.append(line) if hint and hint > 0: hint -= len(line) if hint <= 0: break return lines else: return self._do_read(self.rfile.readlines, hint) def __iter__(self): return iter(self.read, b'') def get_socket(self): return self._sock def set_hundred_continue_response_headers(self, headers, capitalize_response_headers=True): # Response headers capitalization (default) # CONTent-TYpe: TExt/PlaiN -> Content-Type: TExt/PlaiN # Per HTTP RFC standard, header name is case-insensitive. # Please, fix your client to ignore header case if possible. if capitalize_response_headers: headers = [ ('-'.join([x.capitalize() for x in key.split('-')]), value) for key, value in headers] self.hundred_continue_headers = headers def discard(self, buffer_size=16 << 10): while self.read(buffer_size): pass class HeaderLineTooLong(Exception): pass class HeadersTooLarge(Exception): pass def get_logger(log, debug): if callable(getattr(log, 'info', None)) \ and callable(getattr(log, 'debug', None)): return log else: return LoggerFileWrapper(log or sys.stderr, debug) class LoggerNull(object): def __init__(self): pass def error(self, msg, *args, **kwargs): pass def info(self, msg, *args, **kwargs): pass def debug(self, msg, *args, **kwargs): pass def write(self, msg, *args): pass class LoggerFileWrapper(LoggerNull): def __init__(self, log, debug): self.log = log self._debug = debug def error(self, msg, *args, **kwargs): self.write(msg, *args) def info(self, msg, *args, **kwargs): self.write(msg, *args) def debug(self, msg, *args, **kwargs): if self._debug: self.write(msg, *args) def write(self, msg, *args): msg = msg + '\n' if args: msg = msg % args self.log.write(msg) class FileObjectForHeaders(object): def __init__(self, fp): self.fp = fp self.total_header_size = 0 def readline(self, size=-1): sz = size if size < 0: sz = MAX_HEADER_LINE rv = self.fp.readline(sz) if len(rv) >= MAX_HEADER_LINE: raise HeaderLineTooLong() self.total_header_size += len(rv) if self.total_header_size > MAX_TOTAL_HEADER_SIZE: raise HeadersTooLarge() return rv class HttpProtocol(BaseHTTPServer.BaseHTTPRequestHandler): protocol_version = 'HTTP/1.1' minimum_chunk_size = MINIMUM_CHUNK_SIZE capitalize_response_headers = True # https://github.com/eventlet/eventlet/issues/295 # Stdlib default is 0 (unbuffered), but then `wfile.writelines()` looses data # so before going back to unbuffered, remove any usage of `writelines`. wbufsize = 16 << 10 def __init__(self, conn_state, server): self.request = conn_state[1] self.client_address = conn_state[0] self.conn_state = conn_state self.server = server self.setup() try: self.handle() finally: self.finish() def setup(self): # overriding SocketServer.setup to correctly handle SSL.Connection objects conn = self.connection = self.request # TCP_QUICKACK is a better alternative to disabling Nagle's algorithm # https://news.ycombinator.com/item?id=10607422 if getattr(socket, 'TCP_QUICKACK', None): try: conn.setsockopt(socket.IPPROTO_TCP, socket.TCP_QUICKACK, True) except socket.error: pass try: self.rfile = conn.makefile('rb', self.rbufsize) self.wfile = conn.makefile('wb', self.wbufsize) except (AttributeError, NotImplementedError): if hasattr(conn, 'send') and hasattr(conn, 'recv'): # it's an SSL.Connection self.rfile = socket._fileobject(conn, "rb", self.rbufsize) self.wfile = socket._fileobject(conn, "wb", self.wbufsize) else: # it's a SSLObject, or a martian raise NotImplementedError( '''eventlet.wsgi doesn't support sockets of type {0}'''.format(type(conn))) def handle(self): self.close_connection = True while True: self.handle_one_request() if self.conn_state[2] == STATE_CLOSE: self.close_connection = 1 if self.close_connection: break def _read_request_line(self): if self.rfile.closed: self.close_connection = 1 return '' try: return self.rfile.readline(self.server.url_length_limit) except greenio.SSL.ZeroReturnError: pass except socket.error as e: last_errno = support.get_errno(e) if last_errno in BROKEN_SOCK: self.server.log.debug('({0}) connection reset by peer {1!r}'.format( self.server.pid, self.client_address)) elif last_errno not in BAD_SOCK: raise return '' def handle_one_request(self): if self.server.max_http_version: self.protocol_version = self.server.max_http_version self.raw_requestline = self._read_request_line() if not self.raw_requestline: self.close_connection = 1 return if len(self.raw_requestline) >= self.server.url_length_limit: self.wfile.write(RESPONSE_414) self.close_connection = 1 return orig_rfile = self.rfile try: self.rfile = FileObjectForHeaders(self.rfile) if not self.parse_request(): return except HeaderLineTooLong: self.wfile.write( b"HTTP/1.0 400 Header Line Too Long\r\n" b"Connection: close\r\nContent-length: 0\r\n\r\n") self.close_connection = 1 return except HeadersTooLarge: self.wfile.write( b"HTTP/1.0 400 Headers Too Large\r\n" b"Connection: close\r\nContent-length: 0\r\n\r\n") self.close_connection = 1 return finally: self.rfile = orig_rfile content_length = self.headers.get('content-length') if content_length is not None: try: if int(content_length) < 0: raise ValueError except ValueError: # Negative, or not an int at all self.wfile.write( b"HTTP/1.0 400 Bad Request\r\n" b"Connection: close\r\nContent-length: 0\r\n\r\n") self.close_connection = 1 return self.environ = self.get_environ() self.application = self.server.app try: self.server.outstanding_requests += 1 try: self.handle_one_response() except socket.error as e: # Broken pipe, connection reset by peer if support.get_errno(e) not in BROKEN_SOCK: raise finally: self.server.outstanding_requests -= 1 def handle_one_response(self): start = time.time() headers_set = [] headers_sent = [] # Grab the request input now; app may try to replace it in the environ request_input = self.environ['eventlet.input'] # Push the headers-sent state into the Input so it won't send a # 100 Continue response if we've already started a response. request_input.headers_sent = headers_sent wfile = self.wfile result = None use_chunked = [False] length = [0] status_code = [200] def write(data): towrite = [] if not headers_set: raise AssertionError("write() before start_response()") elif not headers_sent: status, response_headers = headers_set headers_sent.append(1) header_list = [header[0].lower() for header in response_headers] towrite.append(six.b('%s %s\r\n' % (self.protocol_version, status))) for header in response_headers: towrite.append(six.b('%s: %s\r\n' % header)) # send Date header? if 'date' not in header_list: towrite.append(six.b('Date: %s\r\n' % (format_date_time(time.time()),))) client_conn = self.headers.get('Connection', '').lower() send_keep_alive = False if self.close_connection == 0 and \ self.server.keepalive and (client_conn == 'keep-alive' or (self.request_version == 'HTTP/1.1' and not client_conn == 'close')): # only send keep-alives back to clients that sent them, # it's redundant for 1.1 connections send_keep_alive = (client_conn == 'keep-alive') self.close_connection = 0 else: self.close_connection = 1 if 'content-length' not in header_list: if self.request_version == 'HTTP/1.1': use_chunked[0] = True towrite.append(b'Transfer-Encoding: chunked\r\n') elif 'content-length' not in header_list: # client is 1.0 and therefore must read to EOF self.close_connection = 1 if self.close_connection: towrite.append(b'Connection: close\r\n') elif send_keep_alive: towrite.append(b'Connection: keep-alive\r\n') towrite.append(b'\r\n') # end of header writing if use_chunked[0]: # Write the chunked encoding towrite.append(six.b("%x" % (len(data),)) + b"\r\n" + data + b"\r\n") else: towrite.append(data) wfile.writelines(towrite) wfile.flush() length[0] = length[0] + sum(map(len, towrite)) def start_response(status, response_headers, exc_info=None): status_code[0] = status.split()[0] if exc_info: try: if headers_sent: # Re-raise original exception if headers sent six.reraise(exc_info[0], exc_info[1], exc_info[2]) finally: # Avoid dangling circular ref exc_info = None # Response headers capitalization # CONTent-TYpe: TExt/PlaiN -> Content-Type: TExt/PlaiN # Per HTTP RFC standard, header name is case-insensitive. # Please, fix your client to ignore header case if possible. if self.capitalize_response_headers: if six.PY2: def cap(x): return x.capitalize() else: def cap(x): return x.encode('latin1').capitalize().decode('latin1') response_headers = [ ('-'.join([cap(x) for x in key.split('-')]), value) for key, value in response_headers] headers_set[:] = [status, response_headers] return write try: try: WSGI_LOCAL.already_handled = False result = self.application(self.environ, start_response) # Set content-length if possible if headers_set and not headers_sent and hasattr(result, '__len__'): # We've got a complete final response if 'Content-Length' not in [h for h, _v in headers_set[1]]: headers_set[1].append(('Content-Length', str(sum(map(len, result))))) if request_input.should_send_hundred_continue: # We've got a complete final response, and never sent a 100 Continue. # There's no chance we'll need to read the body as we stream out the # response, so we can be nice and send a Connection: close header. self.close_connection = 1 towrite = [] towrite_size = 0 just_written_size = 0 minimum_write_chunk_size = int(self.environ.get( 'eventlet.minimum_write_chunk_size', self.minimum_chunk_size)) for data in result: if len(data) == 0: continue if isinstance(data, six.text_type): data = data.encode('ascii') towrite.append(data) towrite_size += len(data) if towrite_size >= minimum_write_chunk_size: write(b''.join(towrite)) towrite = [] just_written_size = towrite_size towrite_size = 0 if WSGI_LOCAL.already_handled: self.close_connection = 1 return if towrite: just_written_size = towrite_size write(b''.join(towrite)) if not headers_sent or (use_chunked[0] and just_written_size): write(b'') except Exception: self.close_connection = 1 tb = traceback.format_exc() self.server.log.info(tb) if not headers_sent: err_body = six.b(tb) if self.server.debug else b'' start_response("500 Internal Server Error", [('Content-type', 'text/plain'), ('Content-length', len(err_body))]) write(err_body) finally: if hasattr(result, 'close'): result.close() if request_input.should_send_hundred_continue: # We just sent the final response, no 100 Continue. Client may or # may not have started to send a body, and if we keep the connection # open we've seen clients either # * send a body, then start a new request # * skip the body and go straight to a new request # Looks like the most broadly compatible option is to close the # connection and let the client retry. # https://curl.se/mail/lib-2004-08/0002.html # Note that we likely *won't* send a Connection: close header at this point self.close_connection = 1 if (request_input.chunked_input or request_input.position < (request_input.content_length or 0)): # Read and discard body if connection is going to be reused if self.close_connection == 0: try: request_input.discard() except ChunkReadError as e: self.close_connection = 1 self.server.log.error(( 'chunked encoding error while discarding request body.' + ' client={0} request="{1}" error="{2}"').format( self.get_client_address()[0], self.requestline, e, )) except IOError as e: self.close_connection = 1 self.server.log.error(( 'I/O error while discarding request body.' + ' client={0} request="{1}" error="{2}"').format( self.get_client_address()[0], self.requestline, e, )) finish = time.time() for hook, args, kwargs in self.environ['eventlet.posthooks']: hook(self.environ, *args, **kwargs) if self.server.log_output: client_host, client_port = self.get_client_address() self.server.log.info(self.server.log_format % { 'client_ip': client_host, 'client_port': client_port, 'date_time': self.log_date_time_string(), 'request_line': self.requestline, 'status_code': status_code[0], 'body_length': length[0], 'wall_seconds': finish - start, }) def get_client_address(self): host, port = addr_to_host_port(self.client_address) if self.server.log_x_forwarded_for: forward = self.headers.get('X-Forwarded-For', '').replace(' ', '') if forward: host = forward + ',' + host return (host, port) def get_environ(self): env = self.server.get_environ() env['REQUEST_METHOD'] = self.command env['SCRIPT_NAME'] = '' pq = self.path.split('?', 1) env['RAW_PATH_INFO'] = pq[0] if six.PY2: env['PATH_INFO'] = urllib.parse.unquote(pq[0]) else: env['PATH_INFO'] = urllib.parse.unquote(pq[0], encoding='latin1') if len(pq) > 1: env['QUERY_STRING'] = pq[1] ct = self.headers.get('content-type') if ct is None: try: ct = self.headers.type except AttributeError: ct = self.headers.get_content_type() env['CONTENT_TYPE'] = ct length = self.headers.get('content-length') if length: env['CONTENT_LENGTH'] = length env['SERVER_PROTOCOL'] = 'HTTP/1.0' sockname = self.request.getsockname() server_addr = addr_to_host_port(sockname) env['SERVER_NAME'] = server_addr[0] env['SERVER_PORT'] = str(server_addr[1]) client_addr = addr_to_host_port(self.client_address) env['REMOTE_ADDR'] = client_addr[0] env['REMOTE_PORT'] = str(client_addr[1]) env['GATEWAY_INTERFACE'] = 'CGI/1.1' try: headers = self.headers.headers except AttributeError: headers = self.headers._headers else: headers = [h.split(':', 1) for h in headers] env['headers_raw'] = headers_raw = tuple((k, v.strip(' \t\n\r')) for k, v in headers) for k, v in headers_raw: k = k.replace('-', '_').upper() if k in ('CONTENT_TYPE', 'CONTENT_LENGTH'): # These do not get the HTTP_ prefix and were handled above continue envk = 'HTTP_' + k if envk in env: env[envk] += ',' + v else: env[envk] = v if env.get('HTTP_EXPECT', '').lower() == '100-continue': wfile = self.wfile wfile_line = b'HTTP/1.1 100 Continue\r\n' else: wfile = None wfile_line = None chunked = env.get('HTTP_TRANSFER_ENCODING', '').lower() == 'chunked' env['wsgi.input'] = env['eventlet.input'] = Input( self.rfile, length, self.connection, wfile=wfile, wfile_line=wfile_line, chunked_input=chunked) env['eventlet.posthooks'] = [] return env def finish(self): try: BaseHTTPServer.BaseHTTPRequestHandler.finish(self) except socket.error as e: # Broken pipe, connection reset by peer if support.get_errno(e) not in BROKEN_SOCK: raise greenio.shutdown_safe(self.connection) self.connection.close() def handle_expect_100(self): return True class Server(BaseHTTPServer.HTTPServer): def __init__(self, socket, address, app, log=None, environ=None, max_http_version=None, protocol=HttpProtocol, minimum_chunk_size=None, log_x_forwarded_for=True, keepalive=True, log_output=True, log_format=DEFAULT_LOG_FORMAT, url_length_limit=MAX_REQUEST_LINE, debug=True, socket_timeout=None, capitalize_response_headers=True): self.outstanding_requests = 0 self.socket = socket self.address = address self.log = LoggerNull() if log_output: self.log = get_logger(log, debug) self.app = app self.keepalive = keepalive self.environ = environ self.max_http_version = max_http_version self.protocol = protocol self.pid = os.getpid() self.minimum_chunk_size = minimum_chunk_size self.log_x_forwarded_for = log_x_forwarded_for self.log_output = log_output self.log_format = log_format self.url_length_limit = url_length_limit self.debug = debug self.socket_timeout = socket_timeout self.capitalize_response_headers = capitalize_response_headers if not self.capitalize_response_headers: warnings.warn("""capitalize_response_headers is disabled. Please, make sure you know what you are doing. HTTP headers names are case-insensitive per RFC standard. Most likely, you need to fix HTTP parsing in your client software.""", DeprecationWarning, stacklevel=3) def get_environ(self): d = { 'wsgi.errors': sys.stderr, 'wsgi.version': (1, 0), 'wsgi.multithread': True, 'wsgi.multiprocess': False, 'wsgi.run_once': False, 'wsgi.url_scheme': 'http', } # detect secure socket if hasattr(self.socket, 'do_handshake'): d['wsgi.url_scheme'] = 'https' d['HTTPS'] = 'on' if self.environ is not None: d.update(self.environ) return d def process_request(self, conn_state): # The actual request handling takes place in __init__, so we need to # set minimum_chunk_size before __init__ executes and we don't want to modify # class variable proto = new(self.protocol) if self.minimum_chunk_size is not None: proto.minimum_chunk_size = self.minimum_chunk_size proto.capitalize_response_headers = self.capitalize_response_headers try: proto.__init__(conn_state, self) except socket.timeout: # Expected exceptions are not exceptional conn_state[1].close() # similar to logging "accepted" in server() self.log.debug('({0}) timed out {1!r}'.format(self.pid, conn_state[0])) def log_message(self, message): raise AttributeError('''\ eventlet.wsgi.server.log_message was deprecated and deleted. Please use server.log.info instead.''') try: new = types.InstanceType except AttributeError: new = lambda cls: cls.__new__(cls) try: import ssl ACCEPT_EXCEPTIONS = (socket.error, ssl.SSLError) ACCEPT_ERRNO = set((errno.EPIPE, errno.EBADF, errno.ECONNRESET, ssl.SSL_ERROR_EOF, ssl.SSL_ERROR_SSL)) except ImportError: ACCEPT_EXCEPTIONS = (socket.error,) ACCEPT_ERRNO = set((errno.EPIPE, errno.EBADF, errno.ECONNRESET)) def socket_repr(sock): scheme = 'http' if hasattr(sock, 'do_handshake'): scheme = 'https' name = sock.getsockname() if sock.family == socket.AF_INET: hier_part = '//{0}:{1}'.format(*name) elif sock.family == socket.AF_INET6: hier_part = '//[{0}]:{1}'.format(*name[:2]) elif sock.family == socket.AF_UNIX: hier_part = name else: hier_part = repr(name) return scheme + ':' + hier_part def server(sock, site, log=None, environ=None, max_size=None, max_http_version=DEFAULT_MAX_HTTP_VERSION, protocol=HttpProtocol, server_event=None, minimum_chunk_size=None, log_x_forwarded_for=True, custom_pool=None, keepalive=True, log_output=True, log_format=DEFAULT_LOG_FORMAT, url_length_limit=MAX_REQUEST_LINE, debug=True, socket_timeout=None, capitalize_response_headers=True): """Start up a WSGI server handling requests from the supplied server socket. This function loops forever. The *sock* object will be closed after server exits, but the underlying file descriptor will remain open, so if you have a dup() of *sock*, it will remain usable. .. warning:: At the moment :func:`server` will always wait for active connections to finish before exiting, even if there's an exception raised inside it (*all* exceptions are handled the same way, including :class:`greenlet.GreenletExit` and those inheriting from `BaseException`). While this may not be an issue normally, when it comes to long running HTTP connections (like :mod:`eventlet.websocket`) it will become problematic and calling :meth:`~eventlet.greenthread.GreenThread.wait` on a thread that runs the server may hang, even after using :meth:`~eventlet.greenthread.GreenThread.kill`, as long as there are active connections. :param sock: Server socket, must be already bound to a port and listening. :param site: WSGI application function. :param log: logging.Logger instance or file-like object that logs should be written to. If a Logger instance is supplied, messages are sent to the INFO log level. If not specified, sys.stderr is used. :param environ: Additional parameters that go into the environ dictionary of every request. :param max_size: Maximum number of client connections opened at any time by this server. Default is 1024. :param max_http_version: Set to "HTTP/1.0" to make the server pretend it only supports HTTP 1.0. This can help with applications or clients that don't behave properly using HTTP 1.1. :param protocol: Protocol class. Deprecated. :param server_event: Used to collect the Server object. Deprecated. :param minimum_chunk_size: Minimum size in bytes for http chunks. This can be used to improve performance of applications which yield many small strings, though using it technically violates the WSGI spec. This can be overridden on a per request basis by setting environ['eventlet.minimum_write_chunk_size']. :param log_x_forwarded_for: If True (the default), logs the contents of the x-forwarded-for header in addition to the actual client ip address in the 'client_ip' field of the log line. :param custom_pool: A custom GreenPool instance which is used to spawn client green threads. If this is supplied, max_size is ignored. :param keepalive: If set to False, disables keepalives on the server; all connections will be closed after serving one request. :param log_output: A Boolean indicating if the server will log data or not. :param log_format: A python format string that is used as the template to generate log lines. The following values can be formatted into it: client_ip, date_time, request_line, status_code, body_length, wall_seconds. The default is a good example of how to use it. :param url_length_limit: A maximum allowed length of the request url. If exceeded, 414 error is returned. :param debug: True if the server should send exception tracebacks to the clients on 500 errors. If False, the server will respond with empty bodies. :param socket_timeout: Timeout for client connections' socket operations. Default None means wait forever. :param capitalize_response_headers: Normalize response headers' names to Foo-Bar. Default is True. """ serv = Server( sock, sock.getsockname(), site, log, environ=environ, max_http_version=max_http_version, protocol=protocol, minimum_chunk_size=minimum_chunk_size, log_x_forwarded_for=log_x_forwarded_for, keepalive=keepalive, log_output=log_output, log_format=log_format, url_length_limit=url_length_limit, debug=debug, socket_timeout=socket_timeout, capitalize_response_headers=capitalize_response_headers, ) if server_event is not None: warnings.warn( 'eventlet.wsgi.Server() server_event kwarg is deprecated and will be removed soon', DeprecationWarning, stacklevel=2) server_event.send(serv) if max_size is None: max_size = DEFAULT_MAX_SIMULTANEOUS_REQUESTS if custom_pool is not None: pool = custom_pool else: pool = eventlet.GreenPool(max_size) if not (hasattr(pool, 'spawn') and hasattr(pool, 'waitall')): raise AttributeError('''\ eventlet.wsgi.Server pool must provide methods: `spawn`, `waitall`. If unsure, use eventlet.GreenPool.''') # [addr, socket, state] connections = {} def _clean_connection(_, conn): connections.pop(conn[0], None) conn[2] = STATE_CLOSE greenio.shutdown_safe(conn[1]) conn[1].close() try: serv.log.info('({0}) wsgi starting up on {1}'.format(serv.pid, socket_repr(sock))) while is_accepting: try: client_socket, client_addr = sock.accept() client_socket.settimeout(serv.socket_timeout) serv.log.debug('({0}) accepted {1!r}'.format(serv.pid, client_addr)) connections[client_addr] = connection = [client_addr, client_socket, STATE_IDLE] (pool.spawn(serv.process_request, connection) .link(_clean_connection, connection)) except ACCEPT_EXCEPTIONS as e: if support.get_errno(e) not in ACCEPT_ERRNO: raise except (KeyboardInterrupt, SystemExit): serv.log.info('wsgi exiting') break finally: for cs in six.itervalues(connections): prev_state = cs[2] cs[2] = STATE_CLOSE if prev_state == STATE_IDLE: greenio.shutdown_safe(cs[1]) pool.waitall() serv.log.info('({0}) wsgi exited, is_accepting={1}'.format(serv.pid, is_accepting)) try: # NOTE: It's not clear whether we want this to leave the # socket open or close it. Use cases like Spawning want # the underlying fd to remain open, but if we're going # that far we might as well not bother closing sock at # all. sock.close() except socket.error as e: if support.get_errno(e) not in BROKEN_SOCK: traceback.print_exc()