forked from named-data/python-ndn
/
stream_socket.py
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/
stream_socket.py
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# -----------------------------------------------------------------------------
# Copyright (C) 2019-2020 Xinyu Ma
#
# This file is part of python-ndn.
#
# Licensed 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 abc
import asyncio as aio
from typing import Optional, Callable, Coroutine, Any
from ..encoding.tlv_var import read_tl_num_from_stream
class Face(metaclass=abc.ABCMeta):
running: bool = False
callback: Callable[[int, bytes], Coroutine[Any, None, None]] = None
def __init__(self):
self.running = False
@abc.abstractmethod
async def open(self):
pass
@abc.abstractmethod
def shutdown(self):
pass
@abc.abstractmethod
def send(self, data: bytes):
pass
@abc.abstractmethod
async def run(self):
pass
class StreamFace(Face, metaclass=abc.ABCMeta):
reader: Optional[aio.StreamReader] = None
writer: Optional[aio.StreamWriter] = None
def shutdown(self):
self.running = False
if self.writer:
self.writer.close()
self.writer = None
async def run(self):
while self.running:
try:
typ = await read_tl_num_from_stream(self.reader)
siz = await read_tl_num_from_stream(self.reader)
buf = await self.reader.readexactly(siz)
aio.ensure_future(self.callback(typ, buf))
except aio.IncompleteReadError:
self.shutdown()
def send(self, data: bytes):
self.writer.write(data)
class UnixFace(StreamFace):
path: str = '/var/run/nfd.sock'
def __init__(self, path: str = ''):
super().__init__()
if path:
self.path = path
async def open(self):
self.reader, self.writer = await aio.open_unix_connection(self.path)
self.running = True
class TcpFace(StreamFace):
host: str = '127.0.0.1'
port: int = 6363
def __init__(self, host: str = '', port: int = 0):
super().__init__()
if host:
self.host = host
if port:
self.port = port
async def open(self):
self.reader, self.writer = await aio.open_connection(self.host, self.port)
self.running = True