| #!/usr/local/bin/python3 |
| |
| # 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 |
| # |
| # Unless required by applicable law or agreed to in writing, software |
| # distributed under the License is distributed on an "AS IS" BASIS, |
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| # See the License for the specific language governing permissions and |
| # limitations under the License. |
| import re |
| import struct |
| |
| from message_types import message_types |
| from read_values import read_int_value, read_byte_value, call_reader_function |
| |
| CHUNKED_MESSAGE_HEADER_LENGTH = 17 |
| |
| class ChunkedResponseDecoder: |
| def __init__(self): |
| self.reset() |
| |
| def add_header(self, connection, header): |
| if len(self.chunked_message) > 0: |
| raise Exception("Previous chunked message is not completed, can't process another header") |
| |
| if len(header) == 2 * CHUNKED_MESSAGE_HEADER_LENGTH: |
| offset = 0 |
| message_type = "" |
| (message_type, offset) = call_reader_function(header, offset, read_int_value) |
| self.chunked_message["Type"] = message_types[message_type] |
| # TODO: pass connection value in as a parameter |
| self.chunked_message["Connection"] = connection |
| self.chunked_message["Direction"] = "<---" |
| (self.chunked_message["Parts"], offset) = call_reader_function(header, offset, read_int_value) |
| (self.chunked_message["TransactionId"], offset) = call_reader_function(header, offset, read_int_value) |
| chunk_size = 0 |
| flags = 0 |
| (chunk_size, offset) = call_reader_function(header, offset, read_int_value) |
| (flags, offset) = call_reader_function(header, offset, read_byte_value) |
| self.chunked_message["ChunkInfo"] = [] |
| self.add_chunk_header(chunk_size, flags) |
| else: |
| raise IndexError("Chunked message header should be " + str(CHUNKED_MESSAGE_HEADER_LENGTH) + " bytes") |
| |
| def add_chunk_header(self, chunk_size, flags): |
| self.chunk_index += 1 |
| if len(self.chunked_message) == 0: |
| raise Exception("Can't add chunk header before message header") |
| |
| key = "Chunk" + str(self.chunk_index) |
| inner_item = dict(ChunkLength=int(chunk_size), Flags=flags) |
| outer_item = {} |
| outer_item[key] = inner_item |
| self.chunked_message["ChunkInfo"].append(outer_item) |
| self.chunk_flags = flags |
| |
| def add_chunk(self, chunk): |
| if len(self.chunked_message) == 0: |
| raise Exception("Can't add chunks before message header") |
| |
| self.message_body += chunk |
| |
| def is_complete_message(self): |
| return self.chunk_flags & 0x1 |
| |
| def get_decoded_message(self): |
| return self.chunked_message |
| |
| def reset(self): |
| self.header = "" |
| self.message_body = "" |
| self.chunked_message = {} |
| self.complete = False |
| self.chunk_flags = 0xff |
| self.chunk_index = -1 |