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# Licensed to the Apache Software Foundation (ASF) under one
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# 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
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
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from __future__ import absolute_import

from thrift.Thrift import TProcessor, TMessageType, TException

from thrift.protocol import TProtocolDecorator, TMultiplexedProtocol


class TMultiplexedProcessor(TProcessor):
  def __init__(self):
    self.services = {}

  def registerProcessor(self, serviceName, processor):
    self.services[serviceName] = processor

  def process(self, iprot, oprot):
    (name, type, seqid) = iprot.readMessageBegin();
    if type != TMessageType.CALL & type != TMessageType.ONEWAY:
      raise TException("TMultiplex protocol only supports CALL & ONEWAY")

    index = name.find(TMultiplexedProtocol.SEPARATOR)
    if index < 0:
      raise TException("Service name not found in message name: " + name + ". Did you forget to use TMultiplexProtocol in your client?")

    serviceName = name[0:index]
    call = name[index+len(TMultiplexedProtocol.SEPARATOR):]
    if not serviceName in self.services:
      raise TException("Service name not found: " + serviceName + ". Did you forget to call registerProcessor()?")

    standardMessage = (
      call,
      type,
      seqid
    )
    return self.services[serviceName].process(StoredMessageProtocol(iprot, standardMessage), oprot)


class StoredMessageProtocol(TProtocolDecorator.TProtocolDecorator):
  def __init__(self, protocol, messageBegin):
    TProtocolDecorator.TProtocolDecorator.__init__(self, protocol)
    self.messageBegin = messageBegin

  def readMessageBegin(self):
    return self.messageBegin
