Python Tutorial


Introduction

All Apache Thrift tutorials require that you have:

  1. Built and installed the Apache Thrift Compiler and Libraries, see Building from source for more details.
  2. Generated the tutorial.thrift and shared.thrift files as discussed here.

    thrift -r --gen py tutorial.thrift
    
  3. Followed all prerequisites listed below.

Prerequisites

Client

import sys
import glob
sys.path.append('gen-py')
sys.path.insert(0, glob.glob('../../lib/py/build/lib*')[0])

from tutorial import Calculator
from tutorial.ttypes import InvalidOperation, Operation, Work

from thrift import Thrift
from thrift.transport import TSocket
from thrift.transport import TTransport
from thrift.protocol import TBinaryProtocol


def main():
    # Make socket
    transport = TSocket.TSocket('localhost', 9090)

    # 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 = Calculator.Client(protocol)

    # Connect!
    transport.open()

    client.ping()
    print('ping()')

    sum = client.add(1, 1)
    print(('1+1=%d' % (sum)))

    work = Work()

    work.op = Operation.DIVIDE
    work.num1 = 1
    work.num2 = 0

    try:
        quotient = client.calculate(1, work)
        print('Whoa? You know how to divide by zero?')
        print('FYI the answer is %d' % quotient)
    except InvalidOperation as e:
        print(('InvalidOperation: %r' % e))

    work.op = Operation.SUBTRACT
    work.num1 = 15
    work.num2 = 10

    diff = client.calculate(1, work)
    print(('15-10=%d' % (diff)))

    log = client.getStruct(1)
    print(('Check log: %s' % (log.value)))

    # Close!
    transport.close()

Server

import glob
import sys
sys.path.append('gen-py')
sys.path.insert(0, glob.glob('../../lib/py/build/lib*')[0])

from tutorial import Calculator
from tutorial.ttypes import InvalidOperation, Operation

from shared.ttypes import SharedStruct

from thrift.transport import TSocket
from thrift.transport import TTransport
from thrift.protocol import TBinaryProtocol
from thrift.server import TServer


class CalculatorHandler:
    def __init__(self):
        self.log = {}

    def ping(self):
        print('ping()')

    def add(self, n1, n2):
        print('add(%d,%d)' % (n1, n2))
        return n1 + n2

    def calculate(self, logid, work):
        print('calculate(%d, %r)' % (logid, work))

        if work.op == Operation.ADD:
            val = work.num1 + work.num2
        elif work.op == Operation.SUBTRACT:
            val = work.num1 - work.num2
        elif work.op == Operation.MULTIPLY:
            val = work.num1 * work.num2
        elif work.op == Operation.DIVIDE:
            if work.num2 == 0:
                x = InvalidOperation()
                x.whatOp = work.op
                x.why = 'Cannot divide by 0'
                raise x
            val = work.num1 / work.num2
        else:
            x = InvalidOperation()
            x.whatOp = work.op
            x.why = 'Invalid operation'
            raise x

        log = SharedStruct()
        log.key = logid
        log.value = '%d' % (val)
        self.log[logid] = log

        return val

    def getStruct(self, key):
        print('getStruct(%d)' % (key))
        return self.log[key]

    def zip(self):
        print('zip()')

if __name__ == '__main__':
    handler = CalculatorHandler()
    processor = Calculator.Processor(handler)
    transport = TSocket.TServerSocket(port=9090)
    tfactory = TTransport.TBufferedTransportFactory()
    pfactory = TBinaryProtocol.TBinaryProtocolFactory()

    server = TServer.TSimpleServer(processor, transport, tfactory, pfactory)

    # You could do one of these for a multithreaded server
    # server = TServer.TThreadedServer(processor, transport, tfactory, pfactory)
    # server = TServer.TThreadPoolServer(processor, transport, tfactory, pfactory)

Additional Information