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# Copyright 2019 The TensorFlow Authors. 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.
# ==============================================================================
"""Application-level experiment ID support."""
import re
# Value of the first path component that signals that the second path
# component represents an experiment ID.
_EXPERIMENT_PATH_COMPONENT = "experiment"
# Key into the WSGI environment used for the experiment ID.
WSGI_ENVIRON_KEY = "HTTP_TENSORBOARD_EXPERIMENT_ID"
class ExperimentIdMiddleware:
"""WSGI middleware extracting experiment IDs from URL to environment.
Any request whose path matches `/experiment/SOME_EID[/...]` will have
its first two path components stripped, and its experiment ID stored
onto the WSGI environment with key taken from the `WSGI_ENVIRON_KEY`
constant. All other requests will have paths unchanged and the
experiment ID set to the empty string. It noops if the key taken from
the `WSGI_ENVIRON_KEY` is already present in the environment.
Instances of this class are WSGI applications (see PEP 3333).
"""
def __init__(self, application):
"""Initializes an `ExperimentIdMiddleware`.
Args:
application: The WSGI application to wrap (see PEP 3333).
"""
self._application = application
# Regular expression that matches the whole `/experiment/EID` prefix
# (without any trailing slash) and captures the experiment ID.
self._pat = re.compile(
r"/%s/([^/]*)" % re.escape(_EXPERIMENT_PATH_COMPONENT)
)
def __call__(self, environ, start_response):
# Skip ExperimentIdMiddleware was already called.
if WSGI_ENVIRON_KEY in environ:
return self._application(environ, start_response)
path = environ.get("PATH_INFO", "")
m = self._pat.match(path)
if m:
eid = m.group(1)
new_path = path[m.end(0) :]
root = m.group(0)
else:
eid = ""
new_path = path
root = ""
environ[WSGI_ENVIRON_KEY] = eid
environ["PATH_INFO"] = new_path
environ["SCRIPT_NAME"] = environ.get("SCRIPT_NAME", "") + root
return self._application(environ, start_response)
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