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#
# SPDX-License-Identifier: GPL-2.0-only
#
import abc
import asyncio
import json
import os
import socket
from . import chunkify, DEFAULT_MAX_CHUNK
class AsyncClient(object):
def __init__(self, proto_name, proto_version, logger):
self.reader = None
self.writer = None
self.max_chunk = DEFAULT_MAX_CHUNK
self.proto_name = proto_name
self.proto_version = proto_version
self.logger = logger
async def connect_tcp(self, address, port):
async def connect_sock():
return await asyncio.open_connection(address, port)
self._connect_sock = connect_sock
async def connect_unix(self, path):
async def connect_sock():
return await asyncio.open_unix_connection(path)
self._connect_sock = connect_sock
async def setup_connection(self):
s = '%s %s\n\n' % (self.proto_name, self.proto_version)
self.writer.write(s.encode("utf-8"))
await self.writer.drain()
async def connect(self):
if self.reader is None or self.writer is None:
(self.reader, self.writer) = await self._connect_sock()
await self.setup_connection()
async def close(self):
self.reader = None
if self.writer is not None:
self.writer.close()
self.writer = None
async def _send_wrapper(self, proc):
count = 0
while True:
try:
await self.connect()
return await proc()
except (
OSError,
ConnectionError,
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
async def send_message(self, msg):
async def get_line():
line = await self.reader.readline()
if not line:
raise ConnectionError("Connection closed")
line = line.decode("utf-8")
if not line.endswith("\n"):
raise ConnectionError("Bad message %r" % msg)
return line
async def proc():
for c in chunkify(json.dumps(msg), self.max_chunk):
self.writer.write(c.encode("utf-8"))
await self.writer.drain()
l = await get_line()
m = json.loads(l)
if m and "chunk-stream" in m:
lines = []
while True:
l = (await get_line()).rstrip("\n")
if not l:
break
lines.append(l)
m = json.loads("".join(lines))
return m
return await self._send_wrapper(proc)
class Client(object):
def __init__(self):
self.client = self._get_async_client()
self.loop = asyncio.new_event_loop()
self._add_methods('connect_tcp', 'close')
@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):
# AF_UNIX has path length issues so chdir here to workaround
cwd = os.getcwd()
try:
os.chdir(os.path.dirname(path))
self.loop.run_until_complete(self.client.connect_unix(os.path.basename(path)))
self.loop.run_until_complete(self.client.connect())
finally:
os.chdir(cwd)
@property
def max_chunk(self):
return self.client.max_chunk
@max_chunk.setter
def max_chunk(self, value):
self.client.max_chunk = value
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