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# *******************************************************************************
# * Copyright (c) 2011 Wind River Systems, Inc. and others.
# * All rights reserved. This program and the accompanying materials
# * are made available under the terms of the Eclipse Public License v1.0
# * which accompanies this distribution, and is available at
# * http://www.eclipse.org/legal/epl-v10.html
# *
# * Contributors:
# * Wind River Systems - initial API and implementation
# *******************************************************************************
import cStringIO, json, binascii, types, exceptions
# channel states
STATE_OPENING = 0
STATE_OPEN = 1
STATE_CLOSED = 2
class TraceListener(object):
def onMessageReceived(self, type, token, service, name, data):
pass
def onMessageSent(self, type, token, service, name, data):
pass
def onChannelClosed(self, error):
pass
def Proxy(object):
def onCommand(self, token, service, name, data):
pass
def onEvent(self, service, name, data):
pass
def onChannelClosed(self, error):
pass
_token_cnt = 0
class Token(object):
def __init__(self, id=None, listener=None):
if id is None:
global _token_cnt
id = str(_token_cnt)
_token_cnt += 1
else:
id = str(id)
self.id = id
self.listener = listener
def getID(self):
return self.id
def getListener(self):
return self.listener
def cancel(self):
return False
class ChannelListener(object):
"""
Channel listener interface.
"""
def onChannelOpened(self):
"""
Called when a channel is opened or redirected.
"""
pass
def onChannelClosed(self, error):
"""
Called when channel closed. If it is closed because of an error,
'error' parameter will describe the error. 'error' is null if channel
is closed normally by calling Channel.close().
@param error - channel exception or null
"""
pass
def congestionLevel(self, level):
"""
Notifies listeners about channel out-bound traffic congestion level changes.
When level > 0 client should delay sending more messages.
@param level - current congestion level
"""
pass
class EventListener(object):
"""
A generic interface for service event listener.
Services usually define a service specific event listener interface,
which is implemented using this generic listener.
Clients should user service specific listener interface,
unless no such interface is defined.
"""
svc_name = "<unknown>"
def event(self, name, data):
"""
Called when service event message is received
@param name - event name
@param data - event arguments encoded as bytearray
"""
pass
class CommandServer(object):
"""
Command server interface.
This interface is to be implemented by service providers.
"""
def command(self, token, name, data):
"""
Called every time a command is received from remote peer.
@param token - command handle
@param name - command name
@param data - command arguments encoded into array of bytes
"""
pass
def toJSONSequence(args):
if args is None:
return None
buf = cStringIO.StringIO()
for arg in args:
json.dump(arg, buf, separators=(',', ':'))
buf.write('\0')
return buf.getvalue()
def fromJSONSequence(bytes):
if bytes[-1] == 0:
del bytes[-1]
str = bytes.decode("UTF-8")
parts = str.split('\0')
objects = []
for part in parts:
if part:
objects.append(json.loads(part))
else:
objects.append(None)
return objects
_ByteArrayType = type(bytearray())
def toByteArray(data):
if data is None: return None
t = type(data)
if t is _ByteArrayType: return data
if t is types.StringType:
return binascii.a2b_base64(data)
raise exceptions.Exception()
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