Work in progress (tons of errors remaining)

.gitignore

@@ -0,0 +1,2 @@
+hbmqtt/__pycache__
+*.pyc

hbmqtt/codecs.py

@@ -5,7 +5,7 @@ import asyncio
 from asyncio import IncompleteReadError
 from math import ceil
 
-from hbmqtt.broker.errors import NoDataException
+from hbmqtt.handlers.errors import NoDataException
 
 
 def bytes_to_hex_str(data):

hbmqtt/errors.py

@@ -10,3 +10,9 @@ class MQTTException(BaseException):
     Base class for all errors refering to MQTT specifications
     """
     pass
+
+class CodecException(HandlerException):
+    """
+    Exceptions thrown by packet encode/decode functions
+    """
+    pass

hbmqtt/handlers/connack.py

@@ -4,7 +4,7 @@
 from hbmqtt.handlers.packet import ResponsePacketHandler, MQTTHeader, PacketType
 from hbmqtt.messages.connack import ConnackPacket, ConnackVariableHeader, ReturnCode
 from hbmqtt.session import Session
-from hbmqtt.handlers.utils import *
+from hbmqtt.codecs import *
 from hbmqtt.errors import MQTTException
 
 

hbmqtt/handlers/connect.py

@@ -1,20 +1,22 @@
 __author__ = 'nico'
 
-import abc
 import asyncio
+
 from hbmqtt.handlers.packet import RequestPacketHandler
 from hbmqtt.handlers.errors import HandlerException, NoDataException
 from hbmqtt.messages.packet import MQTTHeader, PacketType
 from hbmqtt.messages.connect import ConnectPacket, ConnectVariableHeader, ConnectPayload
 from hbmqtt.errors import MQTTException
 from hbmqtt.session import Session
-from hbmqtt.handlers.utils import (
+from hbmqtt.codecs import (
     read_or_raise,
     bytes_to_int,
     decode_string,
     int_to_bytes,
     encode_string
 )
+
+
 class ConnectHandler(RequestPacketHandler):
     def __init__(self):
         super().__init__()

hbmqtt/handlers/packet.py

@@ -6,16 +6,17 @@ import asyncio
 import abc
 import sys
 import logging
+
 from hbmqtt.messages.packet import MQTTPacket, MQTTHeader, PacketType
-from hbmqtt.handlers.utils import int_to_bytes, bytes_to_int, read_or_raise, bytes_to_hex_str
+from hbmqtt.codecs import int_to_bytes, bytes_to_int, read_or_raise, bytes_to_hex_str
 from hbmqtt.handlers.errors import CodecException, HandlerException
 from hbmqtt.session import Session
 from hbmqtt.errors import MQTTException
 
-if sys.version_info >= (3,4):
+if sys.version_info >= (3,4,4):
-    import asyncio.ensure_future as async
+    from asyncio import ensure_future as async
 else:
-    import asyncio.async as async
+    from asyncio import async
 
 
 class PacketHandler(metaclass=abc.ABCMeta):
@@ -48,9 +49,8 @@ class PacketHandler(metaclass=abc.ABCMeta):
         writer.write(encoded_payload)
         yield from writer.drain()
 
-    @staticmethod
     @asyncio.coroutine
-    def read_packet_header(reader: asyncio.StreamReader) -> MQTTHeader:
+    def read_packet_header(self, reader: asyncio.StreamReader) -> MQTTHeader:
         """
         Read and decode MQTT message fixed header from stream
         :return: FixedHeader instance

hbmqtt/messages/connect.py

@@ -1,9 +1,12 @@
 # Copyright (c) 2015 Nicolas JOUANIN
 #
 # See the file license.txt for copying permission.
-from hbmqtt.messages.packet import MQTTPacket, MQTTHeader, PacketType
+import asyncio
+from hbmqtt.messages.packet import MQTTPacket, MQTTFixedHeader, PacketType, MQTTVariableHeader
+from hbmqtt.codecs import *
+from hbmqtt.errors import MQTTException
 
-class ConnectVariableHeader:
+class ConnectVariableHeader(MQTTVariableHeader):
     USERNAME_FLAG = 0x80
     PASSWORD_FLAG = 0x40
     WILL_RETAIN_FLAG = 0x20
@@ -86,6 +89,44 @@ class ConnectVariableHeader:
         self.flags &= (0x00 << 3)
         self.flags |= (val << 3)
 
+    @classmethod
+    def from_stream(cls, reader: asyncio.StreamReader):
+        #  protocol name
+        protocol_name = yield from decode_string(reader)
+        if protocol_name != "MQTT":
+            raise MQTTException('[MQTT-3.1.2-1] Incorrect protocol name: "%s"' % protocol_name)
+
+        # protocol level (only MQTT 3.1.1 supported)
+        protocol_level_byte = yield from read_or_raise(reader, 1)
+        protocol_level = bytes_to_int(protocol_level_byte)
+
+        # flags
+        flags_byte = yield from read_or_raise(reader, 1)
+        flags = bytes_to_int(flags_byte)
+        if flags & 0x01:
+            raise MQTTException('[MQTT-3.1.2-3] CONNECT reserved flag must be set to 0')
+
+        # keep-alive
+        keep_alive_byte = yield from read_or_raise(reader, 2)
+        keep_alive = bytes_to_int(keep_alive_byte)
+
+        return cls(flags, keep_alive, protocol_name, protocol_level)
+
+    def to_bytes(self):
+        out = b''
+
+        # Protocol name
+        out += encode_string(self.proto_name)
+        # Protocol level
+        out += int_to_bytes(self.proto_level)
+        # flags
+        out += int_to_bytes(self.flags)
+        # keep alive
+        out += int_to_bytes(self.keep_alive, 2)
+
+        return out
+
+
 
 class ConnectPayload:
     def __init__(self, client_id=None, will_topic=None, will_message=None, username=None, password=None):
@@ -98,7 +139,7 @@ class ConnectPayload:
 
 class ConnectPacket(MQTTPacket):
     def __init__(self, vh: ConnectVariableHeader, payload: ConnectPayload):
-        header = MQTTHeader(PacketType.CONNECT, 0x00)
+        header = MQTTFixedHeader(PacketType.CONNECT, 0x00)
         super().__init__(header)
         self.variable_header = vh
         self.payload = payload

hbmqtt/messages/packet.py

@@ -3,6 +3,10 @@
 # See the file license.txt for copying permission.
 from enum import Enum
 
+from hbmqtt.errors import CodecException, MQTTException
+from hbmqtt.codecs import *
+import abc
+
 class PacketType(Enum):
     RESERVED_0 = 0
     CONNECT = 1
@@ -25,7 +29,7 @@ class PacketType(Enum):
 def get_packet_type(byte):
     return PacketType(byte)
 
-class MQTTHeader:
+class MQTTFixedHeader:
     def __init__(self, packet_type, flags=0, length=0):
         if isinstance(packet_type, int):
             enum_type = packet_type
@@ -35,9 +39,155 @@ class MQTTHeader:
         self.remaining_length = length
         self.flags = flags
 
+    def to_bytes(self):
+        def encode_remaining_length(length: int):
+            encoded = b''
+            while True:
+                length_byte = length % 0x80
+                length //= 0x80
+                if length > 0:
+                    length_byte |= 0x80
+                encoded += int_to_bytes(length_byte)
+                if length <= 0:
+                    break
+            return encoded
+
+        out = bytes(3)  # MQTTHeader are at least 3 bytes long
+        packet_type = 0
+        try:
+            packet_type = (self.packet_type.value << 4) | self.flags
+            out += int_to_bytes(packet_type)
+        except OverflowError:
+            raise CodecException('packet_type encoding exceed 1 byte length: value=%d', packet_type)
+
+        encoded_length = encode_remaining_length(self.remaining_length)
+        out += encoded_length
+
+        return out
+
+    @asyncio.coroutine
+    def to_stream(self, writer: asyncio.StreamWriter):
+        writer.write(self.to_bytes())
+        yield from writer.drain()
+
+    @classmethod
+    @asyncio.coroutine
+    def from_stream(cls, reader: asyncio.StreamReader):
+        """
+        Read and decode MQTT message fixed header from stream
+        :return: FixedHeader instance
+        """
+        def decode_message_type(byte):
+            byte_type = (bytes_to_int(byte) & 0xf0) >> 4
+            return PacketType(byte_type)
+
+        def decode_flags(data):
+            byte = bytes_to_int(data)
+            return byte & 0x0f
+
+        @asyncio.coroutine
+        def decode_remaining_length():
+            """
+            Decode message length according to MQTT specifications
+            :return:
+            """
+            multiplier = 1
+            value = 0
+            length_bytes = b''
+            while True:
+                encoded_byte = yield from read_or_raise(reader, 1)
+                length_bytes += encoded_byte
+                int_byte = bytes_to_int(encoded_byte)
+                value += (int_byte & 0x7f) * multiplier
+                if (int_byte & 0x80) == 0:
+                    break
+                else:
+                    multiplier *= 128
+                    if multiplier > 128*128*128:
+                        raise MQTTException("Invalid remaining length bytes:%s" % bytes_to_hex_str(length_bytes))
+            return value
+
+        b1 = yield from read_or_raise(reader, 1)
+        msg_type = decode_message_type(b1)
+        if msg_type is PacketType.RESERVED_0 or msg_type is PacketType.RESERVED_15:
+            raise MQTTException("Usage of control packet type %s is forbidden" % msg_type)
+        flags = decode_flags(b1)
+
+        remain_length = yield from decode_remaining_length()
+        return cls(msg_type, flags, remain_length)
+
+
+class MQTTVariableHeader:
+    def __init__(self):
+        pass
+
+    @asyncio.coroutine
+    def to_stream(self, writer: asyncio.StreamWriter):
+        writer.write(self.to_bytes())
+        yield from writer.drain()
+
+    @abc.abstractmethod
+    def to_bytes(self):
+        return
+
+    @classmethod
+    @asyncio.coroutine
+    @abc.abstractclassmethod
+    def from_stream(cls, reader: asyncio.StreamReader):
+        return
+
+
+class MQTTPayload:
+    def __init__(self):
+        pass
+
+    @asyncio.coroutine
+    def to_stream(self, writer: asyncio.StreamWriter):
+        writer.write(self.to_bytes())
+        yield from writer.drain()
+
+    @abc.abstractmethod
+    def to_bytes(self):
+        return
+
+    @classmethod
+    @asyncio.coroutine
+    @abc.abstractclassmethod
+    def from_stream(cls, reader: asyncio.StreamReader):
+        return
+
 
 class MQTTPacket:
-    def __init__(self, fixed: MQTTHeader):
+    def __init__(self, fixed: MQTTFixedHeader, variable_header: MQTTVariableHeader=None, payload: MQTTPayload=None):
         self.fixed_header = fixed
-        self.variable_header = None
+        self.variable_header = variable_header
-        self.payload = None
+        self.payload = payload
+
+    @asyncio.coroutine
+    def to_stream(self, writer: asyncio.StreamWriter):
+        writer.write(self.to_bytes())
+        yield from writer.drain()
+
+    def to_bytes(self):
+        if self.variable_header:
+            variable_header_bytes = self.variable_header.to_bytes()
+        else:
+            variable_header_bytes = b''
+        if self.payload:
+            payload_bytes = self.payload.to_bytes()
+        else:
+            payload_bytes = b''
+
+        self.fixed_header.remaining_length = len(variable_header_bytes) + len(payload_bytes)
+        fixed_header_bytes = self.fixed_header.to_bytes()
+
+        return fixed_header_bytes + variable_header_bytes + payload_bytes
+
+    @classmethod
+    @asyncio.coroutine
+    def from_stream(cls, reader: asyncio.StreamReader):
+        fixed_header = yield from MQTTFixedHeader.from_stream(reader)
+        variable_header = yield from MQTTVariableHeader.from_stream(reader)
+        payload = yield from MQTTPayload.from_stream(reader)
+
+        return cls(fixed_header, variable_header, payload)

tests/codecs/test_utils.py

@@ -4,7 +4,7 @@
 import unittest
 import asyncio
 
-from hbmqtt.handlers.utils import (
+from hbmqtt.codecs import (
     bytes_to_hex_str,
     bytes_to_int,
     decode_string,

tests/handlers/__init__.py

@@ -0,0 +1 @@
+__author__ = 'nico'

tests/handlers/packet.py

@@ -4,18 +4,20 @@
 import unittest
 import asyncio
 
-from hbmqtt.codecs.header import MQTTHeaderCodec, MQTTHeaderException
+from hbmqtt.handlers.packet import PacketHandler
 from hbmqtt.messages.packet import PacketType, MQTTHeader
+from hbmqtt.errors import MQTTException
 
 
-class TestMQTTHeaderCodec(unittest.TestCase):
+class TestPacketHandler(unittest.TestCase):
     def setUp(self):
         self.loop = asyncio.new_event_loop()
 
-    def test_decode_ok(self):
+    def test_read_packet_header(self):
+        packet_handler = PacketHandler()
         stream = asyncio.StreamReader(loop=self.loop)
         stream.feed_data(b'\x10\x7f')
-        header = self.loop.run_until_complete(MQTTHeaderCodec.decode(stream))
+        header = self.loop.run_until_complete(packet_handler.read_packet_header(stream))
         self.assertEqual(header.message_type, PacketType.CONNECT)
         self.assertFalse(header.flags & 0x08)
         self.assertEqual((header.flags & 0x06) >> 1, 0)
@@ -25,8 +27,8 @@ class TestMQTTHeaderCodec(unittest.TestCase):
     def test_decode_ok_with_length(self):
         stream = asyncio.StreamReader(loop=self.loop)
         stream.feed_data(b'\x10\xff\xff\xff\x7f')
-        header = self.loop.run_until_complete(MQTTHeaderCodec.decode(stream))
+        header = self.loop.run_until_complete(PacketHandler.read_packet_header(stream))
-        self.assertEqual(header.message_type, PacketType.CONNECT)
+        self.assertEqual(header.packet_type, PacketType.CONNECT)
         self.assertFalse(header.flags & 0x08)
         self.assertEqual((header.flags & 0x06) >> 1, 0)
         self.assertFalse(header.flags & 0x01)
@@ -35,21 +37,21 @@ class TestMQTTHeaderCodec(unittest.TestCase):
     def test_decode_reserved(self):
         stream = asyncio.StreamReader(loop=self.loop)
         stream.feed_data(b'\x0f\x7f')
-        with self.assertRaises(MQTTHeaderException):
+        with self.assertRaises(MQTTException):
-            self.loop.run_until_complete(MQTTHeaderCodec.decode(stream))
+            self.loop.run_until_complete(PacketHandler.read_packet_header(stream))
 
     def test_decode_ko_with_length(self):
         stream = asyncio.StreamReader(loop=self.loop)
         stream.feed_data(b'\x10\xff\xff\xff\xff\x7f')
-        with self.assertRaises(MQTTHeaderException):
+        with self.assertRaises(MQTTException):
-            self.loop.run_until_complete(MQTTHeaderCodec.decode(stream))
+            self.loop.run_until_complete(PacketHandler.read_packet_header(stream))
 
     def test_encode(self):
         header = MQTTHeader(PacketType.CONNECT, 0x00, 0)
-        data = MQTTHeaderCodec.encode(header)
+        data = self.loop.run_until_complete(PacketHandler._encode_fixed_header(header))
         self.assertEqual(data, b'\x10\x00')
 
     def test_encode_2(self):
         header = MQTTHeader(PacketType.CONNECT, 0x00, 268435455)
-        data = MQTTHeaderCodec.encode(header)
+        data = self.loop.run_until_complete(PacketHandler._encode_fixed_header(header))
         self.assertEqual(data, b'\x10\xff\xff\xff\x7f')