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import json
import logging
import socket
from fluent import sender
class FluentRecordFormatter(logging.Formatter):
"""A structured formatter for Fluent.
Best used with server storing data in an ElasticSearch cluster for example.
:param fmt: a dict or a callable with format string as values to map to provided keys.
If callable, should accept a single argument `LogRecord` and return a dict,
and have a field `usesTime` that is callable and return a bool as would
`FluentRecordFormatter.usesTime`
:param datefmt: strftime()-compatible date/time format string.
:param style: '%', '{' or '$' (used only with Python 3.2 or above)
:param fill_missing_fmt_key: if True, do not raise a KeyError if the format
key is not found. Put None if not found.
:param format_json: if True, will attempt to parse message as json. If not,
will use message as-is. Defaults to True
:param exclude_attrs: switches this formatter into a mode where all attributes
except the ones specified by `exclude_attrs` are logged with the record as is.
If `None`, operates as before, otherwise `fmt` is ignored.
Can be an iterable.
"""
def __init__(
self,
fmt=None,
datefmt=None,
style="%",
fill_missing_fmt_key=False,
format_json=True,
exclude_attrs=None,
):
super().__init__(None, datefmt)
if style != "%":
self.__style, basic_fmt_dict = {
"{": (
logging.StrFormatStyle,
{
"sys_host": "{hostname}",
"sys_name": "{name}",
"sys_module": "{module}",
},
),
"$": (
logging.StringTemplateStyle,
{
"sys_host": "${hostname}",
"sys_name": "${name}",
"sys_module": "${module}",
},
),
}[style]
else:
self.__style = None
basic_fmt_dict = {
"sys_host": "%(hostname)s",
"sys_name": "%(name)s",
"sys_module": "%(module)s",
}
if exclude_attrs is not None:
self._exc_attrs = set(exclude_attrs)
self._fmt_dict = None
self._formatter = self._format_by_exclusion
self.usesTime = super().usesTime
else:
self._exc_attrs = None
if not fmt:
self._fmt_dict = basic_fmt_dict
self._formatter = self._format_by_dict
self.usesTime = self._format_by_dict_uses_time
else:
if callable(fmt):
self._formatter = fmt
self.usesTime = fmt.usesTime
else:
self._fmt_dict = fmt
self._formatter = self._format_by_dict
self.usesTime = self._format_by_dict_uses_time
if format_json:
self._format_msg = self._format_msg_json
else:
self._format_msg = self._format_msg_default
self.hostname = socket.gethostname()
self.fill_missing_fmt_key = fill_missing_fmt_key
def format(self, record):
# Compute attributes handled by parent class.
super().format(record)
# Add ours
record.hostname = self.hostname
# Apply format
data = self._formatter(record)
self._structuring(data, record)
return data
def usesTime(self):
"""This method is substituted on construction based on settings for performance reasons"""
def _structuring(self, data, record):
"""Melds `msg` into `data`.
:param data: dictionary to be sent to fluent server
:param msg: :class:`LogRecord`'s message to add to `data`.
`msg` can be a simple string for backward compatibility with
:mod:`logging` framework, a JSON encoded string or a dictionary
that will be merged into dictionary generated in :meth:`format.
"""
msg = record.msg
if isinstance(msg, dict):
self._add_dic(data, msg)
elif isinstance(msg, str):
self._add_dic(data, self._format_msg(record, msg))
else:
self._add_dic(data, {"message": msg})
def _format_msg_json(self, record, msg):
try:
json_msg = json.loads(str(msg))
if isinstance(json_msg, dict):
return json_msg
else:
return self._format_msg_default(record, msg)
except ValueError:
return self._format_msg_default(record, msg)
def _format_msg_default(self, record, msg):
return {"message": super().format(record)}
def _format_by_exclusion(self, record):
data = {}
for key, value in record.__dict__.items():
if key not in self._exc_attrs:
data[key] = value
return data
def _format_by_dict(self, record):
data = {}
for key, value in self._fmt_dict.items():
try:
if self.__style:
value = self.__style(value).format(record)
else:
value = value % record.__dict__
except KeyError as exc:
value = None
if not self.fill_missing_fmt_key:
raise exc
data[key] = value
return data
def _format_by_dict_uses_time(self):
if self.__style:
search = self.__style.asctime_search
else:
search = "%(asctime)"
return any([value.find(search) >= 0 for value in self._fmt_dict.values()])
@staticmethod
def _add_dic(data, dic):
for key, value in dic.items():
if isinstance(key, str):
data[key] = value
class FluentHandler(logging.Handler):
"""
Logging Handler for fluent.
"""
def __init__(
self,
tag,
host="localhost",
port=24224,
timeout=3.0,
verbose=False,
buffer_overflow_handler=None,
msgpack_kwargs=None,
nanosecond_precision=False,
**kwargs,
):
self.tag = tag
self._host = host
self._port = port
self._timeout = timeout
self._verbose = verbose
self._buffer_overflow_handler = buffer_overflow_handler
self._msgpack_kwargs = msgpack_kwargs
self._nanosecond_precision = nanosecond_precision
self._kwargs = kwargs
self._sender = None
logging.Handler.__init__(self)
def getSenderClass(self):
return sender.FluentSender
@property
def sender(self):
if self._sender is None:
self._sender = self.getSenderInstance(
tag=self.tag,
host=self._host,
port=self._port,
timeout=self._timeout,
verbose=self._verbose,
buffer_overflow_handler=self._buffer_overflow_handler,
msgpack_kwargs=self._msgpack_kwargs,
nanosecond_precision=self._nanosecond_precision,
**self._kwargs,
)
return self._sender
def getSenderInstance(
self,
tag,
host,
port,
timeout,
verbose,
buffer_overflow_handler,
msgpack_kwargs,
nanosecond_precision,
**kwargs,
):
sender_class = self.getSenderClass()
return sender_class(
tag,
host=host,
port=port,
timeout=timeout,
verbose=verbose,
buffer_overflow_handler=buffer_overflow_handler,
msgpack_kwargs=msgpack_kwargs,
nanosecond_precision=nanosecond_precision,
**kwargs,
)
def emit(self, record):
data = self.format(record)
_sender = self.sender
return _sender.emit_with_time(
None,
sender.EventTime(record.created)
if _sender.nanosecond_precision
else int(record.created),
data,
)
def close(self):
self.acquire()
try:
try:
if self._sender is not None:
self._sender.close()
self._sender = None
finally:
super().close()
finally:
self.release()
def __enter__(self):
return self
def __exit__(self, exc_type, exc_val, exc_tb):
self.close()