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dwchannel.py
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import threading
import Queue
from threading import Lock
import copy
from dwcommand import DWParser
import time
from dwlib import canonicalize
from dwio import DWIO
from dwsocket import *
_dwvStatesDict = {
'DWV_S_START': 0,
'DWV_S_DW': 1,
'DWV_S_COMMAND': 2,
'DWV_S_ONLINE': 3,
'DWV_S_LISTENING': 4,
'DWV_S_INBOUND': 5,
'DWV_S_CLOSING': 6,
'DWV_S_CLOSED': 7,
'DWV_S_END': 8,
'DWV_S_TCPOUT': 9,
'DWV_C_AT': 'AT',
'DWV_C_DW': 'DW',
'DWV_C_TCP': 'TCP',
}
dwvStates = {}
for k, v in _dwvStatesDict.items():
if isinstance(v, str):
exec("%s = '%s'" % (k, v))
elif isinstance(v, int):
exec("%s = %s" % (k, v))
dwvStates[v] = k
class DWVModem(DWIO):
def __init__(self, server, channel, conn=None, debug=False):
print "DWVModem __init__"
DWIO.__init__(self, threaded=False)
self.server = server
self.channel = channel
self.conn = conn
self.inbound = False
if self.conn:
self.inbound = True
self.debug = debug
# self.online = False
self.wbuf = ''
self.parser = DWParser(server)
self.connected = True
self.cq = Queue.Queue()
self.cmdThread = threading.Thread(target=self._cmdWorker)
self.cmdThread.daemon = True
# self.cmdThread.start()
self.eatTwo = False
self.listeners = []
self.echo = False
# self.cmdAutoClose = True
self.state = DWV_S_START
self.cmdClass = DWV_C_DW
self.closingTime = None
def _acceptCb(self, conn):
print "%s: accept callback called" % self
n = self.server.registerConn(conn)
r = "%s %s %s" % (n, conn.port, conn.addr[0])
reply = r + "\r" # + r + "\r\n"
if self.debug:
print "reply: (%s)" % reply
self.rq.put(reply)
self.rb.add(len(reply))
def _cmdWorker(self):
if self.cq.empty():
return
cmd = self.cq.get(True)
if self.debug:
print "parser", cmd
res = self.parser.parse(cmd)
exact = False
reply = "0 OK command successful\r\n"
obj = None
msg = None
newState = None
if isinstance(res, dict):
for k, v in res.items():
if k == 'obj':
obj = v
elif k == 'msg':
msg = v
else:
if isinstance(v, str):
v = "'%s'" % v
e = '%s=%s' % (k, v)
if self.debug:
print(e)
exec(e)
if isinstance(res, str) or msg:
if msg:
reply = msg
# print res
elif res.startswith("FAIL") or res.startswith("ERROR") or res.startswith("OK"):
reply = res
else:
reply += res
if self.state == DWV_S_DW:
newState = DWV_S_CLOSING
# if self.cmdAutoClose and not self.online:
# self.connected = False
if isinstance(
res,
DWSocketListener) or isinstance(
obj,
DWSocketListener):
if obj:
res = obj
# self.online = True
self.connected = True
newState = DWV_S_LISTENING
if self.debug:
print "%s: register callback: %s" % (res, self._acceptCb)
res.registerCb(self._acceptCb)
res.at.start()
self.listeners.append(res)
r = "OK listening on port %s" % res.port
exact = True
reply = r + "\r" # + r + "\r\n"
elif isinstance(res, DWIO) or isinstance(obj, DWIO):
if obj:
res = obj
# self.online = True
if self.cmdClass == DWV_C_AT:
newState = DWV_S_ONLINE
elif self.cmdClass == DWV_C_TCP:
newState = DWV_S_TCPOUT
else:
newState = DWV_S_DW
self.conn = res
b = self.conn.binding
if b:
reply = "OK attaching to connection %s\r" % (b)
newState = DWV_S_INBOUND
else:
if not msg:
r = "OK connected to %s:%s" % (
self.conn.host, self.conn.port)
reply = r + "\n" + r + "\r\n"
else:
reply = msg + "\r\n"
# self.eatTwo = True
self.conn.run()
exact = True
# if self.online and not exact:
if not exact:
reply = '\r\n' + reply + '\r\n'
if self.debug:
print "reply: (%s)" % reply
self.rb.add(len(reply))
self.rq.put(reply)
if newState is None:
if self.cmdClass == DWV_C_AT:
newState = DWV_S_COMMAND
else:
newState = DWV_S_DW
self.state = newState
def write(self, data, ifs=('\r', '\n')):
if self.debug:
print "ch: write:", canonicalize(data)
wdata = ''
w = 0
pos = -1
if not self.eatTwo and self.state in [
DWV_S_ONLINE, DWV_S_INBOUND,
DWV_S_TCPOUT] and self.conn:
if self.wbuf:
w += self.conn.write(self.wbuf)
self.wbuf = ''
w += self.conn.write(data)
else:
if self.echo:
self.rq.put(data)
self.rb.add(len(data))
self.wbuf += data
for c in ifs:
pos = self.wbuf.find(c)
if pos >= 0:
break
if pos < 0:
w += len(data)
# while pos >= 0:
else:
if self.eatTwo:
if self.debug:
print "ch: eating: %s" % canonicalize(
self.wbuf[:pos + 1])
if self.echo:
self.rq.put("\r")
self.rb.add(1)
wdata = self.wbuf[:pos]
self.wbuf = self.wbuf[pos + 1:]
w += pos + 1
if self.debug:
print "wdata=(%s) wbuf=(%s)" % (wdata, self.wbuf)
if self.eatTwo:
self.eatTwo = False
else:
wdata = wdata.lstrip().rstrip()
if wdata:
self.cq.put(wdata)
return w
def read(self, rlen=None):
d = ''
if self._outWaiting() > 0:
d += DWIO.read(self, rlen)
if d:
if self.debug:
print "ch:i: read:", canonicalize(d)
elif self.conn:
d += self.conn.read(rlen)
if d:
if self.debug:
print "ch:c: read:", canonicalize(d)
# print "d: (%s)" % d
return d
def outWaiting(self):
newState = None
d = 0
if self.state == DWV_S_CLOSING:
d = self._outWaiting()
if d < 0:
if self.closingTime > 0:
self.closingTime = - 1
else:
self.state = DWV_S_CLOSED
self.closingTime = None
elif self.state == DWV_S_END:
d = 0
elif self.state == DWV_S_CLOSED:
d = 0
if self.closingTime is None:
self.closingTime = 10
if self.closingTime > 0:
self.closingTime -= 1
else:
self.state = DWV_S_END
self.closingTime = None
elif self.state == DWV_S_COMMAND:
d = self._outWaiting()
if d == -1:
newState = DWV_S_CLOSING
self.rb.close()
print("%s: channel closing" % self)
elif self.state in [DWV_S_LISTENING]:
d = self._outWaiting()
if d == -1:
newState = DWV_S_CLOSING
self.rb.close()
print("%s: channel closing" % self)
elif self.state in [DWV_S_ONLINE, DWV_S_INBOUND, DWV_S_TCPOUT]:
d = self._outWaiting()
if d == -1:
newState = DWV_S_CLOSING
self.rb.close()
print("%s: channel closing" % self)
elif d == 0 and self.conn:
d = self.conn.outWaiting()
if d == -1:
if self.state != DWV_S_TCPOUT:
reply = "\r\nNO CARRIER\r\n"
self.rb.add(len(reply))
self.rq.put(reply)
if self.state in [DWV_S_INBOUND, DWV_S_TCPOUT]:
newState = DWV_S_CLOSING
self.rb.close()
else:
newState = DWV_S_COMMAND
d = self._outWaiting()
elif self.state == DWV_S_DW:
d = self._outWaiting()
if d == 0:
newState = DWV_S_CLOSING
self.rb.close()
# d = self._outWaiting()
if self.debug:
stateMsg = "state: %s" % dwvStates[self.state]
if newState:
stateMsg += "==>%s" % dwvStates[newState]
print("%s: ow: d=%d %s" % (self, d, stateMsg))
if newState:
self.state = newState
return d
def _close(self):
print("%s: closing" % self)
if self.conn:
self.conn.close()
for c in self.listeners:
c.close()
self.state = DWV_S_CLOSED
def isConnected(self):
state = self.state not in [DWV_S_CLOSING, DWV_S_CLOSED]
return state
def getState(self):
return dwvStates[self.state]
# vim: ts=4 sw=4 sts=4 expandtab
# vim: ts=4 sw=4 sts=4 expandtab