foolscap实现rpc（三）

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完整的实例

这里有2个程序，一个实现了server端的远程加法协议，另外的一个作为客户端。第一个例子使用的是unauthenticated Tub，所以不需要手动从服务端拷贝FURL到客户端。2个程序都是单独的程序，但一般来讲，你应该创建一个应用并传递文件到twistd-noy。下面展示的是没有authenticated的例子：

listings/pblserver.py服务器程序：

from twisted.internet import reactor

from foolscap.api import Referenceable, UnauthenticatedTub

class MathServer(Referenceable):

def remote_add(self, a, b):

return a+b

def remote_subtract(self, a, b):

return a-b

myserver = MathServer()

tub = UnauthenticatedTub()

tub.listenOn(“tcp:12345”)

tub.setLocation(“localhost:12345”)

url = tub.registerReference(myserver, “math-service”)

print “the object is available at:”, url

tub.startService()

reactor.run()

[listings/pblclient.py]客户端程序:

from twisted.internet import reactor

from foolscap.api import UnauthenticatedTub

def gotErr1(why):

print “unable to get the RemoteReference:”, why

reactor.stop()

def gotErr2(why):

print”unable to invoke the remote method:”, why

reactor.stop()

def gotReference(remote):

print “got a RemoteReference”

print “asking it to add 1+2”

d = remote.callRemote(“add”, a=1, b=2)

d .addCallbacks(gotAnswer, gotErr2)

def gotAnswer(answer):

print “the answer is”, answer

reactor.stop()

tub = UnauthenticatedTub()

tub.startService()

d = tub.getReference(“pbu://localhost:12345/math-service”)

d.addCallbacks(gotReference, gotErr1)

reactor.run()

调试问题：

1）由于目标计算机积极拒绝

Ok，是由于以下的原因：

将tub.listenOn(“tcp:12345”)写成tub.listenOn(“tcp:1234”)导致该错误

下面的是authenticated例子：

listings/pb2server.py服务器程序：

from twisted.internet import reactor

from foolscap import crypto

from foolscap.api import Referenceable, Tub

class MathServer(Referenceable):

def remote_add(self, a, b):

return a+b

def remote_subtract(self, a, b):

return a-b

myserver = MathServer()

tub = Tub(certFile=”pb2server.pem”)

tub.listenOn(“tcp:12345”)

tub.setLocation(“localhost:12345”)

url = tub.registerReference(myserver, “math-service”)

print “the object is available at:”, url

tub.startService()

reactor.run()

[listings/pb2client.py]客户端程序:

import sys

from twisted.internet import reactor

from foolscap.api import Tub

def gotErr1(why):

print “unable to get the RemoteReference:”, why

reactor.stop()

def gotErr2(why):

print”unable to invoke the remote method:”, why

reactor.stop()

def gotReference(remote):

print “got a RemoteReference”

print “asking it to add 1+2”

d = remote.callRemote(“add”, a=1, b=2)

d .addCallbacks(gotAnswer, gotErr2)

def gotAnswer(answer):

print “the answer is”, answer

reactor.stop()

if len(sys.argv) < 2:

print “Usage: pb2client.py URL”

sys.exit(1)

url = sys.argv[1]

tub = Tub()

tub.startService()

d = tub.getReference(url)

d.addCallbacks(gotReference, gotErr1)

reactor.run()

问题：

1）no module named OpenSSL

安装openssl：http://pypi.python.org/pypi/pyOpenSSL下载pyOpenSSL-0.13.winxp32-py2.7.exe (md5)（根据自己的版本来决定）

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