Created
April 9, 2014 20:11
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echo rpc client
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# Shamelessly stolen from the Twisted site | |
from twisted.internet import protocol, reactor, defer, stdio | |
from twisted.protocols.basic import LineReceiver | |
from twisted.internet.endpoints import TCP4ClientEndpoint, connectProtocol | |
import json | |
class JsonEchoClient(LineReceiver): | |
""" | |
Implements the server-side mechanisms | |
""" | |
def __init__(self, *args): | |
# LineReceiver.__init__(self, *args) | |
self.acks = {} | |
self.msgid = 0 | |
self.exposed = { | |
"acknowledge": self.acknowledge, | |
"message" : self.message | |
} | |
self.output = None | |
def connectionMade(self): | |
print "Connected!" | |
self.message(**{"from": "server", | |
"message": "connected"}) | |
def acknowledge(self, reply, blob): | |
pass | |
def sendCall(self, method, *args, **kwargs): | |
blob = { | |
"call": method, | |
"id": self.msgid, | |
"args": args, | |
"kwargs": kwargs | |
} | |
self.sendLine( | |
json.dumps(blob) | |
) | |
self.msgid += 1 | |
self.acks[self.msgid] = {"blob": blob, "deferred": defer.Deferred()} | |
self.acks[self.msgid]["deferred"].addCallback( self.acknowledge, blob ) | |
return self.acks[self.msgid]["deferred"] | |
def sendMessage(self, msg): | |
msg = { | |
"to": "EchoTest", | |
"from": your_name, | |
"message": msg, | |
} | |
return self.sendCall("message", **msg) | |
def message(self, **kwargs): | |
self.output.sendMessage(kwargs) | |
def sendReply(self, reply, msgid): | |
blob = {"reply": reply, | |
"id": msgid | |
} | |
self.sendLine(json.dumps(blob)) | |
def sendError(self, message, id_): | |
blob = {"error": True, | |
"message": message, | |
"id": id_ | |
} | |
self.sendLine(json.dumps(blob)) | |
def reply(self, m): | |
# receives a reply from a remote host | |
msgid = m["id"] | |
if msgid not in self.acks: | |
# error | |
return self.error("no such id %s" % msgid) | |
df = self.acks[msgid]["deferred"] | |
df.callback(m) | |
def lineReceived(self, line): | |
"""Receives a line from our remote""" | |
print "Line!" | |
m = None | |
try: | |
m = json.loads(line) | |
except json.JSONDecodeError as e: | |
self.sendCall(json.dumps( | |
{ | |
"error": True, | |
"message": "json parse error {error}".format(e)} | |
)) | |
print "received non-json-decodable string" | |
return | |
# Implementing the RPC system. | |
if "call" in m: | |
if m["call"] in self.exposed: | |
method = self.exposed[ m["call"] ] | |
reply = method(*m["args"], **m["kwargs"]) | |
self.sendReply(reply, m["id"]) | |
else: | |
self.call("error", "no method {method}".format(m["call"]), m["id"]) | |
elif "reply" in m: | |
self.reply(m) | |
elif "error" in m: | |
print "Couldn't call remote method: %s" % m["message"] | |
class StdioProtocol(LineReceiver): | |
from os import linesep as delimiter | |
def connectionMade(self): | |
self.connected = True | |
def __init__(self, wire): | |
self.chat = wire | |
wire.output = self | |
def lineReceived(self, line): | |
# print "Got line: %s" % line | |
self.chat.sendMessage(line) | |
def sendMessage(self, line): | |
if not self.connected: | |
raise NotConnectedError("Not connected") | |
self.sendLine(str("<{from}> {message}".format(**line) )) | |
def on_connect(protocol): | |
# Remember that a protocol proxies for one wire connection | |
df = protocol.sendMessage("hello remote server") | |
def ack(m): | |
print "Got an %s!" % m | |
df.addCallback(ack) | |
wire = JsonEchoClient() | |
stdio_ = StdioProtocol(wire) | |
stdio.StandardIO(stdio_) | |
endpoint = TCP4ClientEndpoint(reactor, "localhost", 1235 ) | |
deferred = connectProtocol(endpoint, wire) | |
deferred.addCallback(on_connect) | |
reactor.run() |
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