Called on listening sockets when a new connection arrives in Visual Studio .NET

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Called on listening sockets when a new connection arrives
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dhandle_close()
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Called when the socket is closed
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dhandle_connect()
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Called when a connection is made
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dhandle_error()
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Called when an uncaught Python exception occurs
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21 Network Programming and Sockets
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dhandle_expt()
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Called when out-of-band data for a socket is received
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dhandle_read()
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Called when new data is available to be read from a socket
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dhandle_write()
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Called when an attempt to write data is made
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dreadable()
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This function is used by the select() loop to see whether the object is willing to read data Returns True if so, False if notThis method is called to see if the handle_read() method should be called with new data
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Called by the select() loop to see if the object wants to write data Returns True if so, False otherwiseThis method is always called to see whether the handle_write() method should be called to produce output In addition to the preceding methods, the following methods are used to perform low-level socket operationsThey re similar to those available on a socket object
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daccept()
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Accepts a connection Returns a pair (client, addr) where client is a socket object used to send and receive data on the connection and addr is the address of the client
dbind(address)
Binds the socket to address address is typically a tuple (host, port), but this depends the address family being used
dclose()
Closes the socket
dconnect(address)
Makes a connection address is a tuple (host, port)
dcreate_socket(family, type)
Creates a new socket Arguments are the same as for socketsocket()
dlisten([backlog])
Listens for incoming connections backlog is an integer that is passed to the underlying socketlisten() function
drecv(size)
Receives at most size bytes An empty string indicates the client has closed the channel
dsend(data)
Sends data data is a byte string
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asyncore
The following function is used to start the event loop and process events:
loop([timeout [, use_poll [, map [, count]]]])
Polls for events indefinitelyThe select() function is used for polling unless the use_poll parameter is True, in which case poll() is used instead timeout is the timeout period and is set to 30 seconds by default map is a dictionary containing all the channels to monitor count specifies how many polling operations to perform before returning If count is None (the default), loop() polls forever until all channels are closed If count is 1, the function will execute a single poll for events and return
Example
The following example implements a minimalistic web server using asyncore It implements two classes asynhttp for accepting connections and asynclient for processing client requestsThis should be compared with the example in the asynchat moduleThe main difference is that this example is somewhat lower-level requiring us to worry about breaking the input stream into lines, buffering excess data, and identifying the blank line that terminates the request header
# An asynchronous HTTP server import asyncore, socket import os import mimetypes import collections try: from httpclient import responses except ImportError: from httplib import responses
# Python 3 # Python 2
# This class merely handles accept events class async_http(asyncoredispatcher): def _ _init_ _(self,port): asyncoredispatcher_ _init_ _(self) selfcreate_socket(socketAF_INET,socketSOCK_STREAM) selfsetsockopt(socketSOL_SOCKET, socketSO_REUSEADDR, 1) selfbind(('',port)) selflisten(5) def handle_accept(self): client,addr = selfaccept() return async_http_handler(client) # Handle clients class async_http_handler(asyncoredispatcher): def _ _init_ _(self, sock = None): asyncoredispatcher_ _init_ _(self,sock) selfgot_request = False selfrequest_data = b"" selfwrite_queue = collectionsdeque() selfresponding = False # Only readable if request header not read def readable(self): return not selfgot_request
# Read HTTP request
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21 Network Programming and Sockets
# Read incoming request data def handle_read(self): chunk = selfrecv(8192) selfrequest_data += chunk if b'\r\n\r\n' in selfrequest_data: selfhandle_request() # Handle an incoming request def handle_request(self): selfgot_request = True header_data = selfrequest_data[:selfrequest_datafind(b'\r\n\r\n')] header_text = header_datadecode('latin-1') header_lines = header_textsplitlines() request = header_lines[0]split() op = request[0] url = request[1][1:] selfprocess_request(op,url) # Process the request def process_request(self,op,url): selfresponding = True if op == "GET": if not ospathexists(url): selfsend_error(404,"File %s not found\r\n" % url) else: type, encoding = mimetypesguess_type(url) size = ospathgetsize(url) selfpush_text('HTTP/10 200 OK\r\n') selfpush_text('Content-length: %d\r\n' % size) selfpush_text('Content-type: %s\r\n' % type) selfpush_text('\r\n') selfpush(open(url,"rb")read()) else: selfsend_error(501,"%s method not implemented" % selfop) # Error handling def send_error(self,code,message): selfpush_text('HTTP/10 %s %s\r\n' % (code, responses[code])) selfpush_text('Content-type: text/plain\r\n') selfpush_text('\r\n') selfpush_text(message) # Add binary data to the output queue def push(self,data): selfwrite_queueappend(data) # Add text data to the output queue def push_text(self,text): selfpush(textencode('latin-1')) # Only writable if a response is ready def writable(self): return selfresponding and selfwrite_queue # Write response data def handle_write(self): chunk = selfwrite_queuepopleft() bytes_sent = selfsend(chunk) if bytes_sent != len(chunk): selfwrite_queueappendleft(chunk[bytes_sent:]) if not selfwrite_queue: selfclose()