/
_helpers.py
132 lines (105 loc) · 3.9 KB
/
_helpers.py
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# Copyright 2016 Google LLC All Rights Reserved.
#
# 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.
"""Helper functions for logging handlers."""
import math
import json
try:
import flask
except ImportError: # pragma: NO COVER
flask = None
from google.cloud.logging_v2.handlers.middleware.request import _get_django_request
from google.logging.type.http_request_pb2 import HttpRequest
_DJANGO_TRACE_HEADER = "HTTP_X_CLOUD_TRACE_CONTEXT"
_DJANGO_LENGTH_HEADER = "CONTENT_LENGTH"
_DJANGO_USERAGENT_HEADER = "HTTP_USER_AGENT"
_DJANGO_REMOTE_ADDR_HEADER = "REMOTE_ADDR"
_DJANGO_REFERER_HEADER = "HTTP_REFERER"
_FLASK_TRACE_HEADER = "X_CLOUD_TRACE_CONTEXT"
_PROTOCOL_HEADER = "SERVER_PROTOCOL"
def format_stackdriver_json(record, message):
"""Helper to format a LogRecord in in Stackdriver fluentd format.
Returns:
str: JSON str to be written to the log file.
"""
subsecond, second = math.modf(record.created)
payload = {
"message": message,
"timestamp": {"seconds": int(second), "nanos": int(subsecond * 1e9)},
"thread": record.thread,
"severity": record.levelname,
}
return json.dumps(payload)
def get_request_data_from_flask():
"""Get trace_id and http_request data from flask request headers.
Returns:
str: TraceID in HTTP request headers.
HttpRequest: data about the associated http request.
"""
# build http_request
http_request = HttpRequest(
request_method=flask.request.method,
request_url=flask.request.url,
request_size=flask.request.content_length,
user_agent=flask.request.user_agent.string,
remote_ip=flask.request.remote_addr,
referer=flask.request.referrer,
protocol=flask.request.environ.get(_PROTOCOL_HEADER),
)
# find trace id
trace_id = None
header = flask.request.headers.get(_FLASK_TRACE_HEADER)
if header:
trace_id = header.split("/", 1)[0]
return http_request, trace_id
def get_request_data_from_django():
"""Get trace_id and http_request data from django request headers.
Returns:
str: TraceID in HTTP request headers.
HttpRequest: data about the associated http request.
"""
request = _get_django_request()
if request is None:
return None, None
# build http_request
http_request = HttpRequest(
request_method=request.method,
request_url=request.build_absolute_uri(),
request_size=len(request.body),
user_agent=request.META.get(_DJANGO_USERAGENT_HEADER),
remote_ip=request.META.get(_DJANGO_REMOTE_ADDR_HEADER),
referer=request.META.get(_DJANGO_REFERER_HEADER),
protocol=request.META.get(_PROTOCOL_HEADER),
)
# find trace id
trace_id = None
header = request.META.get(_DJANGO_TRACE_HEADER)
if header:
trace_id = header.split("/", 1)[0]
return http_request, trace_id
def get_request_data():
"""Helper to get trace_id and http_request data from supported web
frameworks (currently supported: Flask and Django).
Returns:
str: TraceID in HTTP request headers.
HttpRequest: data about the associated http request.
"""
checkers = (
get_request_data_from_django,
get_request_data_from_flask,
)
for checker in checkers:
http_request, trace_id = checker()
if http_request is not None:
return http_request, trace_id
return None, None