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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) | |