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logging.py
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logging.py
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# Copyright European Organization for Nuclear Research (CERN) since 2012
#
# 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 datetime
import functools
import itertools
import json
import logging
import re
import sys
from collections.abc import Callable, Iterator, Mapping, Sequence
from traceback import format_tb
from typing import TYPE_CHECKING, Any, Optional
from rucio.common.config import config_get, config_get_bool
if TYPE_CHECKING:
from logging import LogRecord
# Mapping from ECS field paths
# https://www.elastic.co/guide/en/ecs-logging/overview/current/intro.html#_field_mapping
# https://www.elastic.co/guide/en/ecs/8.5/ecs-field-reference.html
# to python log record attributes:
# https://docs.python.org/3/library/logging.html#logrecord-attributes
BUILTIN_FIELDS = (
('@timestamp', 'asctime'),
('message', 'message'),
('log.level', 'levelname'),
('log.origin.function', 'funcName'),
('log.origin.file.line', 'lineno'),
('log.origin.file.name', 'filename'),
('log.logger', 'name'),
('process.pid', 'process'),
('process.name', 'processName'),
('process.thread.id', 'thread'),
('process.thread.name', 'threadName'),
)
ECS_TO_LOG_RECORD_MAP = dict(BUILTIN_FIELDS)
LOG_RECORD_TO_ECS_MAP = dict((f[1], f[0]) for f in BUILTIN_FIELDS)
def _json_serializable(obj: Any):
try:
return obj.__dict__
except AttributeError:
return str(obj)
def _navigate_path(obj: Any, path: Sequence[str]) -> Optional[Any]:
"""
Traverse the path in the given object either via attributes or via dict-like subscriptions.
Returns the found value; None if navigation fails
For example, for an input
obj = request # flask "request" object https://flask.palletsprojects.com/en/2.1.x/api/#flask.Request
path = ['headers', 'X-Rucio-Auth-Token']
returns the value found in
request.headers['X-Rucio-Auth-Token']
"""
value = obj
i = 0
while value and i < len(path):
p = path[i]
try:
value = getattr(value, p)
except AttributeError:
try:
# Allow integers for access into arrays
p = int(p)
except ValueError:
pass
try:
value = value[p]
except (TypeError, KeyError):
value = None
i += 1
if value is obj:
return None
return value
def _unflatten_dict(dictionary: dict[str, Any]) -> dict[str, Any]:
"""
Transform a dict of the form
{'a.b.c': value1, 'a.b.d': value2, 'z': value3}
into
{'a': {'b': {'c': value1, 'd': value2}}, 'z': value3}
On incompatible input keys (for example: 'a.b.c', 'a', 'a.d'), the last key wins
"""
ret = {}
for k, v in dictionary.items():
path = k.split('.')
d = ret
i = 0
while i < len(path) - 1:
existing_v = d.get(path[i])
if isinstance(existing_v, dict):
d = existing_v
else:
d[path[i]] = {}
d = d[path[i]]
i += 1
if i == len(path) - 1:
d[path[i]] = v
return ret
def _get_request_data(request_path: Sequence[str]) -> "Callable[[LogDataSource, LogRecord], Iterator[tuple[str, Optional[Any]]]]":
"""
Returns a function which, when called, will resolve the value
in the flask request object at request_path
"""
# The import fails if imported inside a client due to rsemanager.
# TODO: move to top of file once we got rid of/refactored rsemanager
from flask import has_request_context, request
def _request_data_formatter(record_formatter: "LogDataSource", record: "LogRecord") -> Iterator[tuple[str, Optional[Any]]]:
value = None
if has_request_context() and request_path:
value = _navigate_path(request, request_path)
yield record_formatter.ecs_fields[0], str(value) if value is not None else None
return _request_data_formatter
def _get_record_attribute(attribute: str) -> "Callable[[LogDataSource, LogRecord], Iterator[tuple[str, Optional[Any]]]]":
"""
Returns a function which, when called, will generate the value of the desired attribute from
the record passed in argument.
"""
def _record_attribute_formatter(record_formatter: "LogDataSource", record: "LogRecord") -> Iterator[tuple[str, Optional[Any]]]:
value = None
try:
value = getattr(record, attribute)
except AttributeError:
pass
yield record_formatter.ecs_fields[0], value
return _record_attribute_formatter
def _timestamp_formatter(record_formatter: "LogDataSource", record: "LogRecord") -> Iterator[tuple[str, Optional[Any]]]:
"""
Format a timestamp
"""
yield record_formatter.ecs_fields[0], datetime.datetime.utcfromtimestamp(record.created).isoformat(timespec='milliseconds') + 'Z'
def _ecs_field_to_record_attribute(field_name):
"""
Sanitize the path-like field name into a symbol which can be the name of an object attribute.
"""
record = ECS_TO_LOG_RECORD_MAP.get(field_name)
if record:
return record
return field_name.replace('-', '_').replace('.', '_')
class LogDataSource:
"""
Represents one log data source and allows to format it into one or more json fields
"""
def __init__(
self,
ecs_fields: tuple[str, ...],
formatter: "Optional[Callable[[LogDataSource, LogRecord], Iterator[tuple[str, Optional[Any]]]]]" = None,
dst_record_attr: Optional[str] = None
):
self.ecs_fields = ecs_fields
self._formatter = formatter
self._dst_record_attr = dst_record_attr
def __hash__(self):
return hash(self.ecs_fields)
def __eq__(self, other: Any):
if not other or not isinstance(other, self.__class__):
return False
return self.ecs_fields == other.ecs_fields
def __str__(self):
return self.__class__.__name__ + '(' + ', '.join(self.ecs_fields) + ')'
def format(self, record: "LogRecord"):
if not self._formatter:
return
for field_name, field_value in self._formatter(self, record):
if self._dst_record_attr:
setattr(record, self._dst_record_attr, field_value)
yield field_name, field_value
class MessageLogDataSource(LogDataSource):
def __init__(self):
super().__init__(
ecs_fields=('message', 'error.type', 'error.message', 'error.stack_trace'),
formatter=None,
)
@staticmethod
def _get_exc_info(record):
exc_info = record.exc_info
if not exc_info:
return None
if isinstance(exc_info, bool):
exc_info = sys.exc_info()
if isinstance(exc_info, (list, tuple)):
return exc_info
return None
def format(self, record: "LogRecord"):
exc_info = self._get_exc_info(record)
message = record.getMessage()
error_type, error_message, stack_trace = None, None, None
if exc_info:
error_type = exc_info[0].__name__ if exc_info[0] else None
error_message = str(exc_info[1]) if exc_info[1] else None
stack_trace = "".join(format_tb(record.exc_info[2])) or None if exc_info[2] else None
if not stack_trace:
stack_trace = str(getattr(record, "stack_info", '')) or None
# Set the message into the record field
s = message
if error_message:
if s[-1:] != "\n":
s = s + "\n"
s = s + error_message
if stack_trace:
if s[-1:] != "\n":
s = s + "\n"
s = s + stack_trace
record.message = s
yield from zip(self.ecs_fields, (record.message, error_type, error_message, stack_trace))
class ConstantStrDataSource(LogDataSource):
"""
Prints a constant string for the given ECS field.
"""
def __init__(self, ecs_field, _str):
log_record = ECS_TO_LOG_RECORD_MAP.get(ecs_field, None)
self._str = _str
def _formatter(data_source: LogDataSource, record: "LogRecord"):
yield self.ecs_fields[0], self._str
super().__init__(ecs_fields=(ecs_field,), formatter=_formatter, dst_record_attr=log_record)
class RucioFormatter(logging.Formatter):
"""
The formatter should be a drop-in replacement to the python builtin
formatter, with two additional additions:
- it can output directly to json
- it can include data from the flask 'request' object into the format
When the logger writes to a json format, it tries to respect the
Elastic Common Schema (ECS) specification, but without getting too
strict about it.
When the format string contains a dot-separated "path" starting with
`http.request.`, the rucio formatter will try to extract the given
path from the flask `request` object.
"""
def __init__(
self,
fmt: Optional[str] = None,
validate: Optional[bool] = None,
output_json: bool = False,
additional_fields: Optional[Mapping[str, str]] = None
):
_kwargs = {}
if validate is not None:
_kwargs["validate"] = validate
data_sources: dict[str, LogDataSource] = dict(
(ecs_field, LogDataSource((ecs_field,), formatter=_get_record_attribute(log_record)))
for ecs_field, log_record in BUILTIN_FIELDS
)
data_sources.update({
'@timestamp': LogDataSource(('@timestamp',), formatter=_timestamp_formatter),
'message': MessageLogDataSource(), # ('message', 'error.type', 'error.message', 'error.stack_trace'),
})
data_sources.update(
(ecs_field, LogDataSource((ecs_field,),
dst_record_attr=_ecs_field_to_record_attribute(ecs_field),
formatter=_get_request_data(request_path=request_path.split('.'))))
for ecs_field, request_path in (
('client.account.name', 'headers.X-Rucio-Account'), # this field is rucio-specific, not from the ECS specification
('network.forwarded_ip', 'access_route.0'),
('source.ip', 'remote_addr'),
('url.full', 'url'),
('user_agent.original', 'user_agent'),
)
)
if additional_fields:
data_sources.update({
ecs_field: ConstantStrDataSource(ecs_field, field_value)
for ecs_field, field_value in additional_fields.items()
})
self._desired_data_sources = []
if fmt:
# extract of field1, field2 from the printf format-string "%(field1)s %(field2)i"
# Allow simple path-like structures in fields (words separated with dots):
# - http.request.headers.X-Rucio-Auth-Token
# - http.request.url
_format_string_fields = set(t[0] for t in re.findall(r'%\((\w+(.\w+(-\w+)*)*)\)', fmt))
for field_name in _format_string_fields:
data_source = data_sources.get(LOG_RECORD_TO_ECS_MAP.get(field_name, field_name), None)
if '.' in field_name:
dst_record_attr = _ecs_field_to_record_attribute(field_name)
fmt = fmt.replace(f'%({field_name})', f'%({dst_record_attr})')
if field_name.startswith('http.request.'):
path = field_name.replace('http.request.', '', 1).split('.')
data_source = LogDataSource((field_name,), dst_record_attr=dst_record_attr, formatter=_get_request_data(path))
elif not data_source:
data_source = LogDataSource((field_name,), formatter=_get_record_attribute(field_name))
if data_source:
self._desired_data_sources.append(data_source)
else:
self._desired_data_sources = [data_sources['message']]
self.output_json = output_json
super().__init__(fmt=fmt, style='%', **_kwargs)
def format(self, record):
json_record = dict(itertools.chain.from_iterable(f.format(record) for f in self._desired_data_sources))
if self.output_json:
return self._to_json(_unflatten_dict(json_record))
else:
return super().format(record)
@staticmethod
def _to_json(record):
try:
return json.dumps(record, default=_json_serializable)
except (TypeError, ValueError, OverflowError):
try:
return json.dumps(record)
except (TypeError, ValueError, OverflowError):
return '{}'
def rucio_log_formatter(process_name: Optional[str] = None):
config_logformat = config_get('common', 'logformat', raise_exception=False, default='%(asctime)s\t%(name)s\t%(process)d\t%(levelname)s\t%(message)s')
output_json = config_get_bool('common', 'logjson', default=False)
additional_fields = {}
if process_name:
additional_fields['process.name'] = process_name
return RucioFormatter(fmt=config_logformat, output_json=output_json, additional_fields=additional_fields)
def setup_logging(application=None, process_name=None):
"""
Configures the logging by setting the output stream to stdout and
configures log level and log format.
"""
config_loglevel = getattr(logging, config_get('common', 'loglevel', raise_exception=False, default='DEBUG').upper())
stdouthandler = logging.StreamHandler(stream=sys.stdout)
stdouthandler.setFormatter(rucio_log_formatter(process_name=process_name))
stdouthandler.setLevel(config_loglevel)
logging.basicConfig(level=config_loglevel, handlers=[stdouthandler])
if application:
application.logger.addHandler(stdouthandler)
def formatted_logger(innerfunc, formatstr="%s"):
"""
Decorates the passed function, formatting log input by
the passed formatstr. The format string must always include a %s.
:param innerfunc: function to be decorated. Must take (level, msg) arguments.
:type innerfunc: Callable
:param formatstr: format string with %s as placeholder.
:type formatstr: str
"""
@functools.wraps(innerfunc)
def log_format(level, msg, *args, **kwargs):
return innerfunc(level, formatstr % msg, *args, **kwargs)
return log_format