Browse Source

Middleware and Notification examples

 Includes:
	- swift ceilometer middleware configuration and usage
	- picasso swift middleware for file post-processing that is being uploaded

Change-Id: Id1ef827c62f4c43175f019b8761b7ca9d84bed84
Denis Makogon 2 years ago
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examples/openstack-alarms/swift-notifications.rst View File

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+Swift metering notification
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+===========================
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+
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+DevStack plugins configuration
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+------------------------------
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+
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+Required DevStack plugins::
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+
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+    Panko
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+    Ceilometer
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+    Aodh
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+    Picasso
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+
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+local.conf::
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+
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+    [[local|localrc]]
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+
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+    ADMIN_PASSWORD=root
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+    DATABASE_PASSWORD=root
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+    RABBIT_PASSWORD=root
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+    SERVICE_PASSWORD=root
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+    SERVICE_TOKEN=root
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+
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+    enable_service s-proxy s-object s-container s-account
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+
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+    enable_plugin panko https://git.openstack.org/openstack/panko
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+    enable_plugin ceilometer https://git.openstack.org/openstack/ceilometer
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+    enable_plugin aodh https://git.openstack.org/openstack/aodh
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+
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+    enable_service aodh-evaluator aodh-notifier aodh-api
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+    disable_service ceilometer-alarm-notifier ceilometer-alarm-evaluator
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+
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+    enable_plugin picasso git@github.com:openstack/picasso.git
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+
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+By default Ceilometer DevStack plugin installs python-ceilometermiddleware for Swift as its proxy API middleware that sends notifications through message queue to a specific topic ("notifications" by default)
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+
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+Configuring Ceilometer event pipeline
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+-------------------------------------
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+
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+To enable this functionality, configure Ceilometer to be able to publish events to the queue the aodh-listener service listen on.
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+The event_alarm_topic config option of Aodh identifies which messaging topic the aodh-listener on, the default value is “alarm.all”.
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+
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+Ceilometer publisher needs to be configured using pipeline configuration file (**event_pipeline.yaml** as default) to send events "alarm.all" topic::
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+
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+    ---
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+    sources:
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+        - name: event_source
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+          events:
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+              - "*"
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+          sinks:
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+              - event_sink
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+    sinks:
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+        - name: event_sink
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+          transformers:
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+          publishers:
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+              - notifier://
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+              - notifier://?topic=alarm.all
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+
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+
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+Collecting events from Swift
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+----------------------------
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+
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+On each API request, Swift emits (through python-ceilometermiddleware) notifications to a message queue.
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+Those notifications are being transformed into Ceilometer/Panko events and available via Ceilometer API.
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+
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+Setting up alarms based on Swift notifications
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+----------------------------------------------
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+
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+Once DevStack is installed, create a Picasso app::
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+
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+    openstack fn apps create alarm-notifier-app
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+
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+Create a route::
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+
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+    openstack fn routes create alarm-notifier-app-5a3e626d281 /hello async iron/hello --is-public
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+
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+After that setup Aodh alarm::
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+
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+    aodh alarm create --event-type objectstore.http.request \
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+        --description objectstore_request --period 600 --evaluation-periods 1 \
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+        --alarm-action $(openstack fn routes expose-url alarm-notifier-app-5a3e626d281 /hello) \
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+        --name objectstore_request \
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+        --type event --ok-action $(openstack fn routes expose-url alarm-notifier-app-5a3e626d281 /hello)
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+
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+This alarm would be triggered per each **objectstore.http.request** event in queue and one of the actions (alarm action or OK action) will be executed
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+by submitting POST request with event data.
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+
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+In Aodh (aodh-notifier) logs we can see that event alarm URL is being triggered::
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+
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+    2017-02-16 15:45:14.802 29717 DEBUG aodh.notifier [-] Received 1 messages in batch. sample /opt/stack/aodh/aodh/notifier/__init__.py:98
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+    2017-02-16 15:45:14.803 29717 DEBUG aodh.notifier [-] Notifying alarm 5a911a27-487c-49d4-a4da-68b209eda2cc with action SplitResult(scheme=u'http', netloc=u'192.168.0.114:10001', path=u'/r/alarm-notifier-app-5a3e626d281/hello', query='', fragment='') _handle_action /opt/stack/aodh/aodh/notifier/__init__.py:138
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+    2017-02-16 15:45:14.804 29717 INFO aodh.notifier.rest [-] Notifying alarm objectstore_request 5a911a27-487c-49d4-a4da-68b209eda2cc with severity low from insufficient data to alarm with action SplitResult(scheme=u'http', netloc=u'192.168.0.114:10001', path=u'/r/alarm-notifier-app-5a3e626d281/hello', query='', fragment='') because Event <id=52346005-00d3-4789-9347-1a29bdddde18,event_type=objectstore.http.request> hits the query <query=[]>.. request-id: req-cd265735-ef58-468d-aca3-65e3add9a03c
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+    2017-02-16 15:45:15.041 29717 INFO aodh.notifier.rest [-] Notifying alarm <5a911a27-487c-49d4-a4da-68b209eda2cc> gets response: 200 OK.
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+
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+Also (in aodh-listener)::
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+
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+    2017-02-16 15:56:57.542 29761 DEBUG aodh.evaluator.event [-] Evaluating event: event = {u'event_type': u'objectstore.http.request', u'traits': [[u'typeURI', 1, u'http://schemas.dmtf.org/cloud/audit/1.0/event'], [u'eventTime', 1, u'2017-02-16T13:56:54.322957'], [u'outcome', 1, u'success'], [u'user_id', 1, u'106a49d7d2fe4bc99792a3a95195b843'], [u'initiator_typeURI', 1, u'service/security/account/user'], [u'service', 1, u'ceilometermiddleware'], [u'target_id', 1, u'af2f24bca17e4d7f974c5a07012636db'], [u'observer_id', 1, u'target'], [u'initiator_id', 1, u'106a49d7d2fe4bc99792a3a95195b843'], [u'eventType', 1, u'activity'], [u'target_typeURI', 1, u'service/storage/object'], [u'action', 1, u'read'], [u'project_id', 1, u'04108819f6294723ba539b73b0c40a03'], [u'id', 1, u'b2552bc9-20ad-516c-a9ae-e58a7e016e82']], u'message_signature': u'364eec8d900cac2cc99679b5d171d279c32138114b93250e2954782d1f961c54', u'raw': {}, u'generated': u'2017-02-16T13:56:54.323449', u'message_id': u'6531d952-07f7-4534-aaf2-b6be3934f831'} evaluate_events /opt/stack/aodh/aodh/evaluator/event.py:167
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+    2017-02-16 15:56:57.543 29761 DEBUG aodh.evaluator.event [-] Finished event alarm evaluation. evaluate_events /opt/stack/aodh/aodh/evaluator/event.py:184
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+
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+However the data that is being sent to functions does not contain any useful information regarding actual resources that were modified, so no way to get the information on it.
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+
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+Alternative
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+-----------
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+
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+As part of Picasso distribution, Swift middleware is available, see https://github.com/openstack/picasso/tree/master/examples/python-picassomiddleware

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+# Byte-compiled / optimized / DLL files
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+__pycache__/
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+*.py[cod]
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+*$py.class
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+
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+# C extensions
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+*.so
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+# Distribution / packaging
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+.Python
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+env/
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+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
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+*.manifest
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+# Installer logs
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+pip-delete-this-directory.txt
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+# Unit test / coverage reports
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+htmlcov/
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+.tox/
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+.coverage
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+.coverage.*
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+.cache
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+nosetests.xml
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+coverage.xml
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+*,cover
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+.hypothesis/
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+
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+# Translations
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+*.mo
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+# Django stuff:
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+*.log
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+local_settings.py
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+
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+# Flask stuff:
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+instance/
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+.webassets-cache
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+
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+# Scrapy stuff:
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+.scrapy
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+
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+# Sphinx documentation
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+docs/_build/
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+
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+# PyBuilder
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+target/
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+
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+# IPython Notebook
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+.ipynb_checkpoints
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+
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+# pyenv
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+.python-version
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+
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+# celery beat schedule file
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+celerybeat-schedule
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+
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+# dotenv
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+.env
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+
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+# virtualenv
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+venv/
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+ENV/
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+
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+# Spyder project settings
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+.spyderproject
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+
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+# Rope project settings
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+.ropeproject

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examples/python-picassomiddleware/LICENSE View File

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+OpenStack Swift middleware for serverless functions
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+===================================================
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+This guide assumes you have a working DevStack VM.
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+In DevStack local.conf::
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+
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+    enable_service s-proxy s-object s-container s-account
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+    enable_plugin picasso git@github.com:openstack/picasso.git master
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+
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+this will enable Swift and Picasso inside DevStack
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+
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+Run the following commands::
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+
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+    $ git clone https://github.com/denismakogon/serverless-functions-middleware.git
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+    $ pushd serverless-functions-middleware && sudo python setup.py install; popd
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+
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+Install latest Swift python client::
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+
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+    $ git clone https://github.com/openstack/python-swiftclient.git
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+    $ pushd python-swiftclient && sudo python setup.py install; popd
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+
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+Modify Swift proxy conf by adding::
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+
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+    [filter:functions_middleware]
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+    use = egg:functions#functions_middleware
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+
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+In **[pipeline:main]** section add **functions_middleware** to the list of other middleware in **pipeline** config option
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+Restart Swift proxy service by::
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+
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+    screen -x
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+    restart s-proxy process
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+
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+Create a function::
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+
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+    $ openstack fn apps create testapp
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+    $ openstack fn routes create testapp-1445cef51c68427da92621 /hello sync iron/hello --is-public
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+    $ swift post test_container
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+    $
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+
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+When uploading a file to Swift, specify **X-FUNCTION-URL**.
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+The value can be retrieved using expose-url command against desired function::
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+
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+    $ openstack fn routes expose-url testapp-1445cef51c68427da92621 /hello
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+    $ swift upload test_container file --header "X-FUNCTION-URL:$(openstack fn routes expose-url testapp-1445cef51c68427da92621 /hello)"
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+
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+A function that is being used would be supplied with X-AUTH-URL, X-PROJECT-ID and all relevant data about container and a file that is being uploaded.

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examples/python-picassomiddleware/functions/middleware.py View File

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+# Licensed under the Apache License, Version 2.0 (the "License");
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+# you may not use this file except in compliance with the License.
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+# You may obtain a copy of the License at
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+#
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+#    http://www.apache.org/licenses/LICENSE-2.0
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+#
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+# Unless required by applicable law or agreed to in writing, software
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+# distributed under the License is distributed on an "AS IS" BASIS,
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+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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+# implied.
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+# See the License for the specific language governing permissions and
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+# limitations under the License.
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+
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+import json
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+
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+from swift.common.http import is_success
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+from swift.common.swob import Request
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+from swift.common.utils import split_path, get_logger
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+
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+from eventlet import Timeout
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+import six
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+if six.PY3:
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+    from eventlet.green.urllib import request as urllib2
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+else:
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+    from eventlet.green import urllib2
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+
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+
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+class FunctionsWebhookMiddleware(object):
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+
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+    def __init__(self, app, conf):
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+        self.app = app
32
+        self.logger = get_logger(conf, log_route='picasso_functions')
33
+
34
+    def __call__(self, env, start_response):
35
+        req = Request(env)
36
+        resp = req.get_response(self.app)
37
+        self.logger.info("Picasso: available headers: {}".format(str(dict(req.headers))))
38
+        try:
39
+            if "X-Function-URL" in req.headers:
40
+                version, account, container, obj = split_path(req.path_info, 4, 4, True)
41
+                self.logger.info("Picasso version {}, account {}, container {}, object {}"
42
+                                 .format(version, account, container, obj))
43
+                if obj and is_success(resp.status_int) and req.method == 'PUT':
44
+                    webhook = req.headers.get("X-Function-URL")
45
+                    data = json.dumps({
46
+                        "x-auth-token": req.headers.get("X-Auth-Token"),
47
+                        "version": version,
48
+                        "account": account,
49
+                        "container": container,
50
+                        "object": obj,
51
+                        "project_id": req.headers.get("X-Project-Id"),
52
+                    })
53
+                    self.logger.info("Picasso data to send to a function {}"
54
+                                     .format(str(data)))
55
+                    data_as_bytes = data.encode('utf-8')
56
+                    webhook_req = urllib2.Request(webhook, data=data_as_bytes)
57
+                    webhook_req.add_header('Content-Type',
58
+                                           'application/json')
59
+                    webhook_req.add_header(
60
+                        'Content-Length', len(data_as_bytes))
61
+                    self.logger.info("Picasso data to send as bytes {}"
62
+                                     .format(data_as_bytes))
63
+                    with Timeout(60):
64
+                        try:
65
+                            result = urllib2.urlopen(webhook_req).read()
66
+                            self.logger.info(
67
+                                "Picasso function worked fine. Result {}"
68
+                                .format(str(result)))
69
+                        except (Exception, Timeout) as ex:
70
+                            self.logger.error(
71
+                                'Picasso failed POST to webhook {}, '
72
+                                'error {}'.format(webhook, str(ex)))
73
+            else:
74
+                self.logger.info("Picasso skipping functions middleware "
75
+                                 "due to absence of function URL")
76
+        except ValueError:
77
+            # not an object request
78
+            pass
79
+
80
+        return self.app(env, start_response)
81
+
82
+
83
+def filter_factory(global_conf, **local_conf):
84
+    conf = global_conf.copy()
85
+    conf.update(local_conf)
86
+
87
+    def webhook_filter(app):
88
+        return FunctionsWebhookMiddleware(app, conf)
89
+    return webhook_filter

+ 9
- 0
examples/python-picassomiddleware/requirements.txt View File

@@ -0,0 +1,9 @@
1
+# The order of packages is significant, because pip processes them in the order
2
+# of appearance. Changing the order has an impact on the overall integration
3
+# process, which may cause wedges in the gate later.
4
+
5
+pbr>=1.9
6
+setuptools>=17.1
7
+Babel>=1.3
8
+eventlet>=0.17.4 # MIT
9
+greenlet>=0.3.1

+ 25
- 0
examples/python-picassomiddleware/setup.cfg View File

@@ -0,0 +1,25 @@
1
+[metadata]
2
+name = functions
3
+summary = Middleware for OpenStack Swift based on Functions-as-a-Service
4
+description-file =
5
+    README.rst
6
+author = Denis Makogon
7
+author-email = denis@iron.io
8
+home-page = http://www.openstack.org/
9
+classifier =
10
+    Environment :: OpenStack
11
+    Intended Audience :: Information Technology
12
+    Intended Audience :: System Administrators
13
+    License :: OSI Approved :: Apache Software License
14
+    Operating System :: POSIX :: Linux
15
+    Programming Language :: Python
16
+    Programming Language :: Python :: 2
17
+    Programming Language :: Python :: 2.7
18
+
19
+[pbr]
20
+skip_authors = True
21
+skip_changelog = True
22
+
23
+[entry_points]
24
+paste.filter_factory =
25
+    functions_middleware = functions.middleware:filter_factory

+ 29
- 0
examples/python-picassomiddleware/setup.py View File

@@ -0,0 +1,29 @@
1
+# Copyright (c) 2013 Hewlett-Packard Development Company, L.P.
2
+#
3
+# Licensed under the Apache License, Version 2.0 (the "License");
4
+# you may not use this file except in compliance with the License.
5
+# You may obtain a copy of the License at
6
+#
7
+#    http://www.apache.org/licenses/LICENSE-2.0
8
+#
9
+# Unless required by applicable law or agreed to in writing, software
10
+# distributed under the License is distributed on an "AS IS" BASIS,
11
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
12
+# implied.
13
+# See the License for the specific language governing permissions and
14
+# limitations under the License.
15
+
16
+# THIS FILE IS MANAGED BY THE GLOBAL REQUIREMENTS REPO - DO NOT EDIT
17
+import setuptools
18
+
19
+# In python < 2.7.4, a lazy loading of package `pbr` will break
20
+# setuptools if some other modules registered functions in `atexit`.
21
+# solution from: http://bugs.python.org/issue15881#msg170215
22
+try:
23
+    import multiprocessing  # noqa
24
+except ImportError:
25
+    pass
26
+
27
+setuptools.setup(
28
+    setup_requires=['pbr>=1.9', 'setuptools>=17.1'],
29
+    pbr=True)

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