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Tuesday, July 13, 2010

Thrift Server-Client in Python

1. Write Thrift stub code

[tkang@neb005 thrift]$ vi helloworld.thrift

const string HELLO_IN_KOREAN = "an-nyoung-ha-se-yo"
const string HELLO_IN_FRENCH = "bonjour!"
const string HELLO_IN_JAPANESE = "konichiwa!"
 
service HelloWorld {
  void ping(),
  i32 sayHello(),
  i32 sayMsg(1:string msg)
}

2. Generate python code

[tkang@neb005 thrift]$ thrift --gen py helloworld.thrift

Generated codes will be saved under "gen-py" directory.

[tkang@neb005 thrift]$ ls
gen-py helloworld.thrift

3. Fill in Server code

[tkang@neb005 thrift]$ mkdir py-impl
[tkang@neb005 thrift]$ cd py-impl
[tkang@neb005 py-impl]$ vi PythonServer.py

#!/usr/bin/env python
 
import sys
sys.path.append('../gen-py')
 
from helloworld import HelloWorld
from helloworld.ttypes import *
 
from thrift.transport import TSocket
from thrift.transport import TTransport
from thrift.protocol import TBinaryProtocol
from thrift.server import TServer
 
import socket
 
class HelloWorldHandler:
  def __init__(self):
    self.log = {}
 
  def ping(self):
    print "ping()"
 
  def sayHello(self):
    print "sayHello()"
    return "say hello from " + socket.gethostbyname(socket.gethostname())
 
  def sayMsg(self, msg):
    print "sayMsg(" + msg + ")"
    return "say " + msg + " from " + socket.gethostbyname(socket.gethostname())
 
handler = HelloWorldHandler()
processor = HelloWorld.Processor(handler)
transport = TSocket.TServerSocket(30303)
tfactory = TTransport.TBufferedTransportFactory()
pfactory = TBinaryProtocol.TBinaryProtocolFactory()
 
server = TServer.TSimpleServer(processor, transport, tfactory, pfactory)
 
print "Starting python server..."
server.serve()
print "done!"

4. Write Client code to connect to server

[tkang@neb005 py-impl]$ vi PythonClient.py

#!/usr/bin/env python
 
import sys
sys.path.append('../gen-py')
 
from helloworld import HelloWorld
from helloworld.ttypes import *
from helloworld.constants import *
 
from thrift import Thrift
from thrift.transport import TSocket
from thrift.transport import TTransport
from thrift.protocol import TBinaryProtocol
 
try:
  # Make socket
  transport = TSocket.TSocket('localhost', 30303)
 
  # Buffering is critical. Raw sockets are very slow
  transport = TTransport.TBufferedTransport(transport)
 
  # Wrap in a protocol
  protocol = TBinaryProtocol.TBinaryProtocol(transport)
 
  # Create a client to use the protocol encoder
  client = HelloWorld.Client(protocol)
 
  # Connect!
  transport.open()
 
  client.ping()
  print "ping()"
 
  msg = client.sayHello()
  print msg
  msg = client.sayMsg(HELLO_IN_KOREAN)
  print msg
 
  transport.close()
 
except Thrift.TException, tx:
  print "%s" % (tx.message)