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logging.py
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logging.py
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import asyncio
import logging
import re
from artiq.monkey_patches import *
from artiq.protocols.asyncio_server import AsyncioServer
from artiq.tools import TaskObject, MultilineFormatter
logging.TRACE = 5
logging.addLevelName(logging.TRACE, 'TRACE')
logger = logging.getLogger(__name__)
_fwd_logger = logging.getLogger("fwd")
def log_with_name(name, *args, **kwargs):
_fwd_logger.name = name
_fwd_logger.log(*args, **kwargs)
_name_to_level = {
"CRITICAL": logging.CRITICAL,
"ERROR": logging.ERROR,
"WARN": logging.WARNING,
"WARNING": logging.WARNING,
"INFO": logging.INFO,
"DEBUG": logging.DEBUG,
"TRACE": logging.TRACE,
}
def parse_log_message(msg):
lr = "|".join(_name_to_level.keys())
m = re.fullmatch('('+lr+')(<\d+>)?:([^:]*):(.*)', msg)
if m is None:
return 0, logging.INFO, "print", msg
level = _name_to_level[m.group(1)]
if m.group(2):
multiline = int(m.group(2)[1:-1]) - 1
else:
multiline = 0
name = m.group(3)
message = m.group(4)
return multiline, level, name, message
class LogParser:
def __init__(self, source_cb):
self.source_cb = source_cb
self.multiline_count = 0
self.multiline_level = None
self.multiline_name = None
self.multiline_message = None
def line_input(self, msg):
if self.multiline_count:
self.multiline_message += "\n" + msg
self.multiline_count -= 1
if not self.multiline_count:
log_with_name(
self.multiline_name,
self.multiline_level,
self.multiline_message,
extra={"source": self.source_cb()})
self.multiline_level = None
self.multiline_name = None
self.multiline_message = None
else:
multiline, level, name, message = parse_log_message(msg)
if multiline:
self.multiline_count = multiline
self.multiline_level = level
self.multiline_name = name
self.multiline_message = message
else:
log_with_name(name, level, message,
extra={"source": self.source_cb()})
async def stream_task(self, stream):
while True:
try:
entry = (await stream.readline())
if not entry:
break
self.line_input(entry.decode().rstrip("\r\n"))
except:
logger.debug("exception in log forwarding", exc_info=True)
break
logger.debug("stopped log forwarding of stream %s of %s",
stream, self.source_cb())
_init_string = b"ARTIQ logging\n"
class Server(AsyncioServer):
"""Remote logging TCP server.
Log entries are in the format:
source:levelno<total_lines>:name:message
continuation...
...continuation
"""
async def _handle_connection_cr(self, reader, writer):
try:
line = await reader.readline()
if line != _init_string:
return
source = None
parser = LogParser(lambda: source)
while True:
line = await reader.readline()
if not line:
break
try:
line = line.decode()
except:
return
line = line[:-1]
if parser.multiline_count:
parser.line_input(line)
else:
linesplit = line.split(":", maxsplit=1)
if len(linesplit) != 2:
logger.warning("received improperly formatted message, "
"dropping connection")
return
source, remainder = linesplit
parser.line_input(remainder)
except (ConnectionResetError, ConnectionAbortedError, BrokenPipeError):
# May happens on Windows when client disconnects
pass
finally:
writer.close()
class SourceFilter:
def __init__(self, local_level, local_source):
self.local_level = local_level
self.local_source = local_source
def filter(self, record):
if not hasattr(record, "source"):
record.source = self.local_source
if record.source == self.local_source:
return record.levelno >= self.local_level
else:
# log messages that are forwarded from a source have already
# been filtered, and may have a level below the local level.
return True
class LogForwarder(logging.Handler, TaskObject):
def __init__(self, host, port, reconnect_timer=5.0, queue_size=1000,
**kwargs):
logging.Handler.__init__(self, **kwargs)
self.host = host
self.port = port
self.setFormatter(MultilineFormatter())
self._queue = asyncio.Queue(queue_size)
self.reconnect_timer = reconnect_timer
def emit(self, record):
self._queue.put_nowait(record.source + ":" + self.format(record))
async def _do(self):
reader = writer = None
while True:
try:
reader, writer = await asyncio.open_connection(self.host,
self.port)
writer.write(_init_string)
while True:
message = await self._queue.get() + "\n"
writer.write(message.encode())
await writer.drain()
except asyncio.CancelledError:
return
except:
await asyncio.sleep(self.reconnect_timer)
finally:
if writer is not None:
writer.close()