2021-09-12 05:58:24 +02:00
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from __future__ import annotations
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from librespot import util
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from librespot.crypto import Packet
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from librespot.proto.Metadata_pb2 import AudioFile
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from librespot.structure import Closeable, PacketsReceiver
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import concurrent.futures
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import io
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import logging
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import queue
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import struct
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import threading
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import typing
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if typing.TYPE_CHECKING:
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from librespot.core import Session
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class ChannelManager(Closeable, PacketsReceiver):
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channels: typing.Dict[int, Channel] = {}
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chunk_size = 128 * 1024
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executor_service = concurrent.futures.ThreadPoolExecutor()
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logger = logging.getLogger("Librespot:ChannelManager")
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seq_holder = 0
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seq_holder_lock = threading.Condition()
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__session: Session = None
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def __init__(self, session: Session):
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self.__session = session
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def request_chunk(self, file_id: bytes, index: int, file: AudioFile):
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start = int(index * self.chunk_size / 4)
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end = int((index + 1) * self.chunk_size / 4)
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channel = ChannelManager.Channel(self, file, index)
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self.channels[channel.chunk_id] = channel
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out = io.BytesIO()
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out.write(struct.pack(">H", channel.chunk_id))
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out.write(struct.pack(">i", 0x00000000))
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out.write(struct.pack(">i", 0x00000000))
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out.write(struct.pack(">i", 0x00004E20))
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out.write(struct.pack(">i", 0x00030D40))
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out.write(file_id)
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out.write(struct.pack(">i", start))
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out.write(struct.pack(">i", end))
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out.seek(0)
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self.__session.send(Packet.Type.stream_chunk, out.read())
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def dispatch(self, packet: Packet) -> None:
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payload = io.BytesIO(packet.payload)
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if packet.is_cmd(Packet.Type.stream_chunk_res):
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chunk_id = struct.unpack(">H", payload.read(2))[0]
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channel = self.channels.get(chunk_id)
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if channel is None:
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2021-09-12 06:58:42 +02:00
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self.logger.warning(
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"Couldn't find channel, id: {}, received: {}".format(
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chunk_id, len(packet.payload)))
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2021-09-12 05:58:24 +02:00
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return
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channel.add_to_queue(payload)
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elif packet.is_cmd(Packet.Type.channel_error):
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chunk_id = struct.unpack(">H", payload.read(2))[0]
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channel = self.channels.get(chunk_id)
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if channel is None:
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2021-09-12 06:58:42 +02:00
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self.logger.warning(
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"Dropping channel error, id: {}, code: {}".format(
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chunk_id,
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struct.unpack(">H", payload.read(2))[0]))
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2021-09-12 05:58:24 +02:00
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return
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channel.stream_error(struct.unpack(">H", payload.read(2))[0])
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else:
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2021-09-12 06:58:42 +02:00
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self.logger.warning(
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"Couldn't handle packet, cmd: {}, payload: {}".format(
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packet.cmd, util.bytes_to_hex(packet.payload)))
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2021-09-12 05:58:24 +02:00
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def close(self) -> None:
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self.executor_service.shutdown()
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class Channel:
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channel_manager: ChannelManager
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chunk_id: int
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q = queue.Queue()
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__buffer = io.BytesIO()
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__chunk_index: int
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__file: AudioFile
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__header: bool = True
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def __init__(self, channel_manager: ChannelManager, file: AudioFile,
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chunk_index: int):
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self.channel_manager = channel_manager
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self.__file = file
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self.__chunk_index = chunk_index
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with self.channel_manager.seq_holder_lock:
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self.chunk_id = self.channel_manager.seq_holder
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self.channel_manager.seq_holder += 1
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2021-09-12 06:58:42 +02:00
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self.channel_manager.executor_service.submit(
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lambda: ChannelManager.Channel.Handler(self))
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2021-09-12 05:58:24 +02:00
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def _handle(self, payload: bytes) -> bool:
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if len(payload) == 0:
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if not self.__header:
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self.__file.write_chunk(payload, self.__chunk_index, False)
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return True
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self.channel_manager.logger.debug(
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"Received empty chunk, skipping.")
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return False
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if self.__header:
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length: int
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while len(payload.buffer) > 0:
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length = payload.read_short()
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if not length > 0:
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break
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header_id = payload.read_byte()
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header_data = payload.read(length - 1)
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self.__file.write_header(int.from_bytes(header_id, "big"),
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bytearray(header_data), False)
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self.__header = False
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else:
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self.__buffer.write(payload.read(len(payload.buffer)))
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return False
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def add_to_queue(self, payload):
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self.q.put(payload)
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def stream_error(self, code: int) -> None:
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self.__file.stream_error(self.__chunk_index, code)
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class Handler:
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__channel: ChannelManager.Channel = None
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def __init__(self, channel: ChannelManager.Channel):
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self.__channel = channel
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def run(self) -> None:
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2021-09-12 06:58:42 +02:00
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self.__channel.channel_manager.logger.debug(
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"ChannelManager.Handler is starting")
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2021-09-12 05:58:24 +02:00
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with self.__channel.q.all_tasks_done:
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2021-09-12 06:58:42 +02:00
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self.__channel.channel_manager.channels.pop(
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self.__channel.chunk_id)
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self.__channel.channel_manager.logger.debug(
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"ChannelManager.Handler is shutting down")
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