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202 lines
7.0 KiB
202 lines
7.0 KiB
import socket
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import select
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import sys
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from wire import decode_varint, encode
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from reader import BytesBuffer
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from msg import RequestDecoder, message_types
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# hold the asyncronous state of a connection
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# ie. we may not get enough bytes on one read to decode the message
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class Connection():
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def __init__(self, fd, app):
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self.fd = fd
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self.app = app
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self.recBuf = BytesBuffer(bytearray())
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self.resBuf = BytesBuffer(bytearray())
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self.msgLength = 0
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self.decoder = RequestDecoder(self.recBuf)
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self.inProgress = False # are we in the middle of a message
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def recv(this):
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data = this.fd.recv(1024)
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if not data: # what about len(data) == 0
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raise IOError("dead connection")
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this.recBuf.write(data)
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# TMSP server responds to messges by calling methods on the app
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class TMSPServer():
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def __init__(self, app, port=5410):
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self.app = app
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# map conn file descriptors to (app, reqBuf, resBuf, msgDecoder)
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self.appMap = {}
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self.port = port
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self.listen_backlog = 10
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self.listener = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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self.listener.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
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self.listener.setblocking(0)
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self.listener.bind(('', port))
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self.listener.listen(self.listen_backlog)
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self.shutdown = False
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self.read_list = [self.listener]
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self.write_list = []
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def handle_new_connection(self, r):
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new_fd, new_addr = r.accept()
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new_fd.setblocking(0) # non-blocking
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self.read_list.append(new_fd)
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self.write_list.append(new_fd)
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print 'new connection to', new_addr
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self.appMap[new_fd] = Connection(new_fd, self.app)
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def handle_conn_closed(self, r):
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self.read_list.remove(r)
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self.write_list.remove(r)
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r.close()
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print "connection closed"
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def handle_recv(self, r):
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# app, recBuf, resBuf, conn
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conn = self.appMap[r]
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while True:
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try:
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print "recv loop"
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# check if we need more data first
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if conn.inProgress:
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if (conn.msgLength == 0 or conn.recBuf.size() < conn.msgLength):
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conn.recv()
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else:
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if conn.recBuf.size() == 0:
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conn.recv()
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conn.inProgress = True
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# see if we have enough to get the message length
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if conn.msgLength == 0:
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ll = conn.recBuf.peek()
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if conn.recBuf.size() < 1 + ll:
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# we don't have enough bytes to read the length yet
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return
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print "decoding msg length"
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conn.msgLength = decode_varint(conn.recBuf)
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# see if we have enough to decode the message
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if conn.recBuf.size() < conn.msgLength:
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return
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# now we can decode the message
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# first read the request type and get the particular msg
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# decoder
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typeByte = conn.recBuf.read(1)
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typeByte = int(typeByte[0])
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resTypeByte = typeByte + 0x10
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req_type = message_types[typeByte]
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if req_type == "flush":
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# messages are length prefixed
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conn.resBuf.write(encode(1))
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conn.resBuf.write([resTypeByte])
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conn.fd.send(str(conn.resBuf.buf))
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conn.msgLength = 0
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conn.inProgress = False
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conn.resBuf = BytesBuffer(bytearray())
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return
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decoder = getattr(conn.decoder, req_type)
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print "decoding args"
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req_args = decoder()
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print "got args", req_args
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# done decoding message
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conn.msgLength = 0
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conn.inProgress = False
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req_f = getattr(conn.app, req_type)
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if req_args is None:
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res = req_f()
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elif isinstance(req_args, tuple):
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res = req_f(*req_args)
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else:
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res = req_f(req_args)
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if isinstance(res, tuple):
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res, ret_code = res
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else:
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ret_code = res
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res = None
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print "called", req_type, "ret code:", ret_code
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if ret_code != 0:
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print "non-zero retcode:", ret_code
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if req_type in ("echo", "info"): # these dont return a ret code
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enc = encode(res)
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# messages are length prefixed
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conn.resBuf.write(encode(len(enc) + 1))
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conn.resBuf.write([resTypeByte])
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conn.resBuf.write(enc)
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else:
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enc, encRet = encode(res), encode(ret_code)
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# messages are length prefixed
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conn.resBuf.write(encode(len(enc) + len(encRet) + 1))
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conn.resBuf.write([resTypeByte])
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conn.resBuf.write(encRet)
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conn.resBuf.write(enc)
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except TypeError as e:
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print "TypeError on reading from connection:", e
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self.handle_conn_closed(r)
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return
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except ValueError as e:
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print "ValueError on reading from connection:", e
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self.handle_conn_closed(r)
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return
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except IOError as e:
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print "IOError on reading from connection:", e
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self.handle_conn_closed(r)
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return
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except Exception as e:
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# sys.exc_info()[0] # TODO better
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print "error reading from connection", str(e)
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self.handle_conn_closed(r)
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return
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def main_loop(self):
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while not self.shutdown:
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r_list, w_list, _ = select.select(
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self.read_list, self.write_list, [], 2.5)
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for r in r_list:
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if (r == self.listener):
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try:
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self.handle_new_connection(r)
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# undo adding to read list ...
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except NameError as e:
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print "Could not connect due to NameError:", e
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except TypeError as e:
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print "Could not connect due to TypeError:", e
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except:
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print "Could not connect due to unexpected error:", sys.exc_info()[0]
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else:
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self.handle_recv(r)
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def handle_shutdown(self):
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for r in self.read_list:
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r.close()
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for w in self.write_list:
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try:
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w.close()
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except Exception as e:
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print(e) # TODO: add logging
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self.shutdown = True
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