tutorial/py.tornado/PythonClient.py

#!/usr/bin/env python

#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
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# software distributed under the License is distributed on an
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# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
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import sys
import glob
sys.path.append('gen-py.tornado')
sys.path.insert(0, glob.glob('../../lib/py/build/lib.*')[0])

import logging

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

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

from tornado import gen
from tornado import ioloop


@gen.engine
def communicate(callback=None):
    # create client
    transport = TTornado.TTornadoStreamTransport('localhost', 9090)
    pfactory = TBinaryProtocol.TBinaryProtocolFactory()
    client = Calculator.Client(transport, pfactory)

    # open the transport, bail on error
    try:
        yield gen.Task(transport.open)
    except TTransport.TTransportException as ex:
        logging.error(ex)
        if callback:
            callback()
        return

    # ping
    yield gen.Task(client.ping)
    print "ping()"

    # add
    sum_ = yield gen.Task(client.add, 1, 1)
    print "1 + 1 = {}".format(sum_)

    # make a oneway call without a callback (schedule the write and continue
    # without blocking)
    client.zip()
    print "zip() without callback"

    # make a oneway call with a callback (we'll wait for the stream write to
    # complete before continuing)
    yield gen.Task(client.zip)
    print "zip() with callback"

    # calculate 1/0
    work = Work()
    work.op = Operation.DIVIDE
    work.num1 = 1
    work.num2 = 0

    try:
        quotient = yield gen.Task(client.calculate, 1, work)
        print "Whoa? You know how to divide by zero?"
    except InvalidOperation as io:
        print "InvalidOperation: {}".format(io)

    # calculate 15-10
    work.op = Operation.SUBTRACT
    work.num1 = 15
    work.num2 = 10

    diff = yield gen.Task(client.calculate, 1, work)
    print "15 - 10 = {}".format(diff)

    # getStruct
    log = yield gen.Task(client.getStruct, 1)
    print "Check log: {}".format(log.value)

    # close the transport
    client._transport.close()

    if callback:
        callback()


def main():
    # create an ioloop, do the above, then stop
    io_loop = ioloop.IOLoop.instance()
    def this_joint():
        communicate(callback=io_loop.stop)
    io_loop.add_callback(this_joint)
    io_loop.start()


if __name__ == "__main__":
    main()