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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 exceptions
from tcf import protocol, peer, channel
from tcf.services import locator
from tcf.channel.Command import Command
class Peer(peer.TransientPeer):
def __init__(self, parent, attrs):
super(Peer, self).__init__(attrs)
self.parent = parent
def openChannel(self):
assert protocol.isDispatchThread()
c = self.parent.openChannel()
c.redirect(self.getID())
return c
class ChannelEventListener(channel.EventListener):
def __init__(self, proxy):
self.proxy = proxy
self.channel = proxy.channel
def event(self, name, data):
try:
args = channel.fromJSONSequence(data)
if name == "peerAdded":
assert len(args) == 1
peer = Peer(self.channel.getRemotePeer(), args[0])
if self.proxy.peers.get(peer.getID()):
protocol.log("Invalid peerAdded event", exceptions.Exception())
return
self.proxy.peers[peer.getID()] = peer
for l in self.proxy.listeners:
try:
l.peerAdded(peer)
except exceptions.Exception as x:
protocol.log("Unhandled exception in Locator listener", x)
elif name == "peerChanged":
assert len(args) == 1
m = args[0]
if not m: raise exceptions.Exception("Locator service: invalid peerChanged event - no peer ID")
peer = self.proxy.peers.get(m.get(peer.ATTR_ID))
if not peer: return
self.proxy.peers[peer.getID()] = peer
for l in self.proxy.listeners:
try:
l.peerChanged(peer)
except exceptions.Exception as x:
protocol.log("Unhandled exception in Locator listener", x)
elif name == "peerRemoved":
assert len(args) == 1
id = args[0]
peer = self.proxy.peers.get(id)
if not peer: return
del self.proxy.peers[id]
for l in self.proxy.listeners:
try:
l.peerRemoved(id)
except exceptions.Exception as x:
protocol.log("Unhandled exception in Locator listener", x)
elif name == "peerHeartBeat":
assert len(args) == 1
id = args[0]
peer = self.proxy.peers.get(id)
if not peer: return
for l in self.proxy.listeners:
try:
l.peerHeartBeat(id)
except exceptions.Exception as x:
protocol.log("Unhandled exception in Locator listener", x)
else:
raise exceptions.IOError("Locator service: unknown event: " + name)
except exceptions.Exception as x:
self.channel.terminate(x)
class LocatorProxy(locator.LocatorService):
peers = {}
listeners = []
get_peers_done = False
def __init__(self, channel):
self.channel = channel;
self.event_listener = ChannelEventListener(self)
channel.addEventListener(self, self.event_listener)
def getPeers(self):
return self.peers
def redirect(self, peer, done):
service = self
class RedirectCommand(Command):
def __init__(self):
super(RedirectCommand, self).__init__(service.channel, service, "redirect", [peer])
def done(self, error, args):
if not error:
assert len(args) == 1
error = self.toError(args[0])
done.doneRedirect(self.token, error)
return RedirectCommand().token
def sync(self, done):
service = self
class SyncCommand(Command):
def __init__(self):
super(SyncCommand, self).__init__(service.channel, service, "sync", None)
def done(self, error, args):
if error: service.channel.terminate(error)
done.doneSync(self.token)
return SyncCommand().token
def addListener(self, listener):
self.listeners.add(listener)
if not self.get_peers_done:
service = self
class GetPeersCommand(Command):
def __init__(self):
super(GetPeersCommand, self).__init__(service.channel, service, "getPeers", None)
def done(self, error, args):
if not error:
assert len(args) == 2
error = self.toError(args[0])
if error:
protocol.log("Locator error", error)
return
c = args[1]
if c:
for m in c:
id = m.get(peer.ATTR_ID)
if service.peers.get(id): continue;
peer = Peer(service.channel.getRemotePeer(), m)
service.peers[id] = peer
for l in service.listeners:
try:
l.peerAdded(peer)
except exceptions.Exception as x:
protocol.log("Unhandled exception in Locator listener", x)
self.get_peers_done = True
def removeListener(self, listener):
self.listeners.remove(listener)
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