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# *****************************************************************************
# * Copyright (c) 2011, 2013-2014 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
# *****************************************************************************
from .. import locator
from ... import protocol, peer, channel
from ...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):
if self.proxy.peers is None:
return # peers not synchronized yet
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", Exception())
return
self.proxy.peers[_peer.getID()] = _peer
for l in self.proxy.listeners:
try:
l.peerAdded(_peer)
except 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 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 Exception as x:
protocol.log("Unhandled exception in Locator listener",
x)
elif name == "peerRemoved":
assert len(args) == 1
peerID = args[0]
_peer = self.proxy.peers.get(peerID)
if not _peer:
return
del self.proxy.peers[peerID]
for l in self.proxy.listeners:
try:
l.peerRemoved(peerID)
except Exception as x:
protocol.log("Unhandled exception in Locator listener",
x)
elif name == "peerHeartBeat":
assert len(args) == 1
peerID = args[0]
_peer = self.proxy.peers.get(peerID)
if not _peer:
return
for l in self.proxy.listeners:
try:
l.peerHeartBeat(peerID)
except Exception as x:
protocol.log("Unhandled exception in Locator listener",
x)
else:
raise IOError("Locator service: unknown event: " + name)
except Exception as x:
import sys
x.tb = sys.exc_info()[2]
self.channel.terminate(x)
class LocatorProxy(locator.LocatorService):
def __init__(self, channel):
self.channel = channel
self.peers = None # not yet synchronized
self.listeners = []
self.get_peers_done = False
self.event_listener = ChannelEventListener(self)
channel.addEventListener(self, self.event_listener)
def getAgentID(self, done):
done = self._makeCallback(done)
service = self
class GetAgentIDCommand(Command):
def __init__(self):
super(GetAgentIDCommand, self).__init__(service.channel,
service, "getAgentID",
None)
def done(self, error, args):
agentID = None
if not error:
assert len(args) == 2
error = self.toError(args[0])
agentID = args[1]
done.doneGetAgentID(self.token, error, agentID)
return GetAgentIDCommand().token
def getPeers(self):
assert protocol.isDispatchThread()
return self.peers # None if not synchronized yet
def redirect(self, _peer, done):
done = self._makeCallback(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])
if not error and service.peers:
# The redirect was a success. Invalidate all the peers
# already detected.
for peerId in list(service.peers.keys()):
del service.peers[peerId]
for l in service.listeners:
try:
l.peerRemoved(peerId)
except Exception as x:
protocol.log("Unhandled exception in "\
"Locator listener", x)
assert len(service.peers) == 0
service.peers = None
service.get_peers_done = False
done.doneRedirect(self.token, error)
return RedirectCommand().token
def sync(self, done):
done = self._makeCallback(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.append(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]
service.peers = {} # peers list synchronized
if c:
for m in c:
peerID = m.get(peer.ATTR_ID)
if service.peers.get(peerID):
continue
_peer = Peer(service.channel.getRemotePeer(), m)
service.peers[peerID] = _peer
for l in service.listeners:
try:
l.peerAdded(_peer)
except Exception as x:
protocol.log("Unhandled exception in " +
"Locator listener", x)
GetPeersCommand()
self.get_peers_done = True
def removeListener(self, listener):
self.listeners.remove(listener)
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