Python BufferedByteStream.consume方法代码示例

# 需要导入模块: from pyamf.util import BufferedByteStream [as 别名]
# 或者: from pyamf.util.BufferedByteStream import consume [as 别名]
class BaseNegotiator(object):
    """
    Base functionality for negotiating an RTMP handshake.

    Call L{start} to begin negotiations.

    @ivar observer: An observer for handshake negotiations.
    @type observer: L{IHandshakeObserver}
    @ivar started: Whether negotiations have begun.
    @type started: C{bool}
    @ivar _buffer: Any data that has been received but not yet been consumed.
    @type _buffer: L{BufferedByteStream}
    """


    started = False

    nearRequest = None
    nearResponse = None

    farRequest = None
    farResponse = None

    protocolVersion = 3
    farProtocolVersion = None


    def __init__(self, observer, output):
        self.observer = observer
        self.output = output


    def start(self, uptime=0, version=0):
        """
        Called to start the handshaking negotiations.
        """
        if self.started:
            raise AlreadyStarted('Handshake negotiator cannot be restarted')

        self.started = True

        self.uptime = uptime
        self.version = version

        self._buffer = BufferedByteStream()


    def readPacket(self):
        if self._buffer.remaining() < HANDSHAKE_LENGTH:
            # we're expecting more data
            return

        packet = self._buffer.read(HANDSHAKE_LENGTH)
        self._buffer.consume()

        return packet


    def dataReceived(self, data):
        """
        Called when handshake data has been received.
        """
        if not self.started:
            raise HandshakeError('Data received, but negotiator not started')

        self._buffer.append(data)

        if self.farProtocolVersion is None:
            self.farProtocolVersion = self._buffer.read_uchar()

        packet = self.readPacket()

        if not packet:
            return

        if not self.farRequest:
            self.farRequest = self.buildFarRequest()

            self.farRequest.decode(packet)

            self.farRequestReceived(self.farRequest)

            packet = self.readPacket()

            if not packet:
                return

        if not self.farResponse:
            self.farResponse = self.buildFarResponse()

            self.farResponse.decode(packet)

            self.farResponseReceived(self.farResponse)


    def buildFarRequest(self):
        """
        """
        return RequestPacket()

#.........这里部分代码省略.........

# 需要导入模块: from pyamf.util import BufferedByteStream [as 别名]
# 或者: from pyamf.util.BufferedByteStream import consume [as 别名]
class StreamingChannel(object):
    """
    """


    def __init__(self, channel, streamId, output):
        self.type = None
        self.channel = channel
        self.streamId = streamId
        self.output = output
        self.stream = BufferedByteStream()

        self._lastHeader = None
        self._oldStream = channel.stream
        channel.stream = self.stream

        h = header.Header(channel.channelId)

        # encode a continuation header for speed
        header.encode(self.stream, h, h)

        self._continuationHeader = self.stream.getvalue()
        self.stream.consume()


    def __del__(self):
        try:
            self.channel.stream = self._oldStream
        except:
            pass


    def setType(self, type):
        self.type = type


    def sendData(self, data, timestamp):
        c = self.channel

        if timestamp < c.timestamp:
            relTimestamp = timestamp
        else:
            relTimestamp = timestamp - c.timestamp

        h = header.Header(c.channelId, relTimestamp, self.type, len(data), self.streamId)

        if self._lastHeader is None:
            h.full = True

        c.setHeader(h)
        c.append(data)

        header.encode(self.stream, h, self._lastHeader)
        self._lastHeader = h

        c.marshallOneFrame()

        while not c.complete():
            self.stream.write(self._continuationHeader)
            c.marshallOneFrame()

        c.reset()
        self.output.write(self.stream.getvalue())
        self.stream.consume()

# 需要导入模块: from pyamf.util import BufferedByteStream [as 别名]
# 或者: from pyamf.util.BufferedByteStream import consume [as 别名]
class BaseNegotiator(object):
    """
    Base functionality for negotiating an RTMP handshake.

    @ivar observer: An observer for handshake negotiations.
    @type observer: L{IHandshakeObserver}
    @ivar buffer: Any data that has not yet been consumed.
    @type buffer: L{BufferedByteStream}
    @ivar started: Determines whether negotiations have already begun.
    @type started: C{bool}
    @ivar my_syn: The initial handshake packet that will be sent by this
        negotiator.
    @type my_syn: L{Packet}
    @ivar my_ack: The handshake packet that will be sent after the peer has sent
        its syn.
    @ivar peer_syn: The initial L{Packet} received from the peer.
    @ivar peer_ack: The L{Packet} received in acknowledgement of my syn.
    @ivar peer_version: The handshake version that the peer understands.
    """

    implements(IHandshakeNegotiator)


    def __init__(self, observer, transport):
        self.observer = observer
        self.transport = transport
        self.started = False


    def start(self, uptime=None, version=None):
        """
        Called to start the handshaking negotiations.
        """
        if self.started:
            raise HandshakeError('Handshake negotiator cannot be restarted')

        self.started = True
        self.buffer = BufferedByteStream()

        self.peer_version = None

        self.my_syn = Packet(uptime, version)
        self.my_ack = None

        self.peer_syn = None
        self.peer_ack = None

        self.buildSynPayload(self.my_syn)

        self._writePacket(self.my_syn)


    def getPeerPacket(self):
        """
        Attempts to decode a L{Packet} from the buffer. If there is not enough
        data in the buffer then C{None} is returned.
        """
        if self.buffer.remaining() < HANDSHAKE_LENGTH:
            # we're expecting more data
            return

        packet = Packet()

        packet.decode(self.buffer)

        return packet


    def _writePacket(self, packet, stream=None):
        stream = stream or BufferedByteStream()

        packet.encode(stream)

        self.transport.write(stream.getvalue())


    def dataReceived(self, data):
        """
        Called when handshake data has been received. If an error occurs
        whilst negotiating the handshake then C{self.observer.handshakeFailure}
        will be called, citing the reason.

        3 stages of data are received. The handshake version, the syn packet and
        then the ack packet.
        """
        if not self.started:
            raise HandshakeError('Data was received, but negotiator was '
                'not started')

        self.buffer.append(data)

        self._process()


    def _process(self):
        if not self.peer_syn:
            self.peer_syn = self.getPeerPacket()

            if not self.peer_syn:
                return
#.........这里部分代码省略.........

# 需要导入模块: from pyamf.util import BufferedByteStream [as 别名]
# 或者: from pyamf.util.BufferedByteStream import consume [as 别名]
class RTMPDisassembler(object):
    """
    Disassembling bytestream into RTMP packets.

    RTMP stream slices packets into chunks of L{chunkSize}. This class
    processes incoming stream of RTMP protocol data (after initial handshake)
    and decodes RTMP packets.

    Communication goes independently for each object_id. Last received
    headers are stored for each object_id in L{lastHeaders}. L{pool} holds
    incomplete packet contents also for each object_id.

    @ivar lastHeaders: last received header for object_id
    @type lastHeaders: C{dict}, object_id -> L{RTMPHeader}
    @ivar pool: incomplete packet data for object_id
    @type pool: C{dict}, object_id -> L{BufferedByteStream}
    @ivar chunkSize: size of chunk for this stream
    @type chunkSize: C{int}
    @ivar buffer: incoming buffer with data received from protocol
    @type buffer: L{BufferedByteStream}
    """

    def __init__(self, chunkSize):
        """
        Constructor.

        @param chunkSize: initial size of chunk
        @type chunkSize: C{int}
        """
        self.lastHeaders = {}
        self.pool = {}
        self.chunkSize = chunkSize
        self.buffer = BufferedByteStream()

    def push_data(self, data):
        """
        Push more incoming data.

        @param data: data received
        @type data: C{str}
        """
        self.buffer.seek(0, 2)
        self.buffer.write(data)

        return self

    def disassemble(self):
        """
        Disassemble L{buffer} into packets.

        Returns first decoded packet or None, if no packet could
        be decoded at the moment.

        @return: decoded packet
        @rtype: L{Packet}
        """
        self.buffer.seek(0)

        while self.buffer.remaining() > 0:
            try:
                # try to parse header from stream
                header = RTMPHeader.read(self.buffer)
            except NeedBytes, (bytes,):
                # not enough bytes, return what we've already parsed
                return None

            # fill header with extra data from previous headers received
            # with same object_id
            header.fill(self.lastHeaders.get(header.object_id, RTMPHeader()))

            # get buffer for data of this packet
            buf = self.pool.get(header.object_id, BufferedByteStream())

            # this chunk size is minimum of regular chunk size in this
            # disassembler and what we have left here
            thisChunk = min(header.length - len(buf), self.chunkSize)
            if self.buffer.remaining() < thisChunk:
                # we have not enough bytes to read this chunk of data
                return None

            # we got complete chunk
            buf.write(self.buffer.read(thisChunk))

            # store packet header for this object_id
            self.lastHeaders[header.object_id] = header

            # skip data left in input buffer
            self.buffer.consume()

            # this chunk completes full packet?
            if len(buf) < header.length:
                # no, store buffer for further chunks
                self.pool[header.object_id] = buf
            else:
                # parse packet from header and data
                buf.seek(0, 0)

                # delete stored data for this packet
                if header.object_id in self.pool:
                    del self.pool[header.object_id]
#.........这里部分代码省略.........

# 需要导入模块: from pyamf.util import BufferedByteStream [as 别名]
# 或者: from pyamf.util.BufferedByteStream import consume [as 别名]
class Codec(object):
    """
    Generic channels and frame operations.

    @ivar stream: The underlying buffer containing the raw bytes.
    @type stream: L{BufferedByteStream}
    @ivar channels: A L{dict} of L{BaseChannel} objects that are handling data.
    @ivar frameSize: The maximum size for an individual frame. Read-only, use
        L{setFrameSize} instead.
    """


    def __init__(self):
        self.buffer = BufferedByteStream()

        self.channels = {}
        self.frameSize = FRAME_SIZE
        self.bytes = 0


    def setFrameSize(self, size):
        """
        Set the size of the next frame to be handled.
        """
        self.frameSize = size

        for channel in self.channels.values():
            channel.setFrameSize(size)


    def buildChannel(self, channelId):
        """
        Called to build a channel suitable for use with this codec.

        Must be implemented by subclasses.
        """
        raise NotImplementedError


    def getChannel(self, channelId):
        """
        Returns a channel based on channelId. If the channel doesn't exist,
        then one is created.

        @param channelId: Index for the channel to retrieve.
        @type channelId: C{int}
        @rtype: L{Channel}
        """
        channel = self.channels.get(channelId, None)

        if channel is not None:
            return channel

        if channelId > MAX_CHANNELS:
            raise IndexError('Attempted to get channelId %d which is > %d' % (
                channelId, MAX_CHANNELS))

        channel = self.buildChannel(channelId)
        self.channels[channelId] = channel

        channel.reset()

        return channel


    def clear(self):
        """
        Clears the underlying buffer.
        """
        self.buffer.consume()
        self.buffer.truncate()