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#
# Copyright BitBake Contributors
#
# SPDX-License-Identifier: GPL-2.0-only
#
import abc
import asyncio
import json
import os
import socket
import sys
from .connection import StreamConnection, WebsocketConnection, DEFAULT_MAX_CHUNK
from .exceptions import ConnectionClosedError, InvokeError
class AsyncClient(object):
def __init__(self, proto_name, proto_version, logger, timeout=30):
self.socket = None
self.max_chunk = DEFAULT_MAX_CHUNK
self.proto_name = proto_name
self.proto_version = proto_version
self.logger = logger
self.timeout = timeout
async def connect_tcp(self, address, port):
async def connect_sock():
reader, writer = await asyncio.open_connection(address, port)
return StreamConnection(reader, writer, self.timeout, self.max_chunk)
self._connect_sock = connect_sock
async def connect_unix(self, path):
async def connect_sock():
# AF_UNIX has path length issues so chdir here to workaround
cwd = os.getcwd()
try:
os.chdir(os.path.dirname(path))
# The socket must be opened synchronously so that CWD doesn't get
# changed out from underneath us so we pass as a sock into asyncio
sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM, 0)
sock.connect(os.path.basename(path))
finally:
os.chdir(cwd)
reader, writer = await asyncio.open_unix_connection(sock=sock)
return StreamConnection(reader, writer, self.timeout, self.max_chunk)
self._connect_sock = connect_sock
async def connect_websocket(self, uri):
import websockets
async def connect_sock():
websocket = await websockets.connect(uri, ping_interval=None)
return WebsocketConnection(websocket, self.timeout)
self._connect_sock = connect_sock
async def setup_connection(self):
# Send headers
await self.socket.send("%s %s" % (self.proto_name, self.proto_version))
# End of headers
await self.socket.send("")
async def connect(self):
if self.socket is None:
self.socket = await self._connect_sock()
await self.setup_connection()
async def disconnect(self):
if self.socket is not None:
await self.socket.close()
self.socket = None
async def close(self):
await self.disconnect()
async def _send_wrapper(self, proc):
count = 0
while True:
try:
await self.connect()
return await proc()
except (
OSError,
ConnectionError,
ConnectionClosedError,
json.JSONDecodeError,
UnicodeDecodeError,
) as e:
self.logger.warning("Error talking to server: %s" % e)
if count >= 3:
if not isinstance(e, ConnectionError):
raise ConnectionError(str(e))
raise e
await self.close()
count += 1
def check_invoke_error(self, msg):
if isinstance(msg, dict) and "invoke-error" in msg:
raise InvokeError(msg["invoke-error"]["message"])
async def invoke(self, msg):
async def proc():
await self.socket.send_message(msg)
return await self.socket.recv_message()
result = await self._send_wrapper(proc)
self.check_invoke_error(result)
return result
async def ping(self):
return await self.invoke({"ping": {}})
async def __aenter__(self):
return self
async def __aexit__(self, exc_type, exc_value, traceback):
await self.close()
class Client(object):
def __init__(self):
self.client = self._get_async_client()
self.loop = asyncio.new_event_loop()
# Override any pre-existing loop.
# Without this, the PR server export selftest triggers a hang
# when running with Python 3.7. The drawback is that there is
# potential for issues if the PR and hash equiv (or some new)
# clients need to both be instantiated in the same process.
# This should be revisited if/when Python 3.9 becomes the
# minimum required version for BitBake, as it seems not
# required (but harmless) with it.
asyncio.set_event_loop(self.loop)
self._add_methods("connect_tcp", "ping")
@abc.abstractmethod
def _get_async_client(self):
pass
def _get_downcall_wrapper(self, downcall):
def wrapper(*args, **kwargs):
return self.loop.run_until_complete(downcall(*args, **kwargs))
return wrapper
def _add_methods(self, *methods):
for m in methods:
downcall = getattr(self.client, m)
setattr(self, m, self._get_downcall_wrapper(downcall))
def connect_unix(self, path):
self.loop.run_until_complete(self.client.connect_unix(path))
self.loop.run_until_complete(self.client.connect())
@property
def max_chunk(self):
return self.client.max_chunk
@max_chunk.setter
def max_chunk(self, value):
self.client.max_chunk = value
def disconnect(self):
self.loop.run_until_complete(self.client.close())
def close(self):
if self.loop:
self.loop.run_until_complete(self.client.close())
if sys.version_info >= (3, 6):
self.loop.run_until_complete(self.loop.shutdown_asyncgens())
self.loop.close()
self.loop = None
def __enter__(self):
return self
def __exit__(self, exc_type, exc_value, traceback):
self.close()
return False
|
