Support Keystone session in python runtime

Keystone session can be used directly in user function to access
OpenStack services.

Include openstack clients in python requirements as well.

Add a python function example.

Implements: blueprint qinling-openstack-clients
Change-Id: I4798c404cb57bafe14049f57ba8db7c7125106c7

example/functions/python/get_swift_object.py

@@ -0,0 +1,12 @@
+import swiftclient
+
+
+def stat_object(context, container, object):
+    conn = swiftclient.Connection(
+        session=context['os_session'],
+        os_options={'region_name': 'RegionOne'},
+    )
+
+    obj_header = conn.head_object(container, object)
+
+    return obj_header

qinling/orchestrator/kubernetes/manager.py

@@ -286,6 +286,7 @@ class KubernetesManager(base.OrchestratorBase):
             'function_id': function_id,
             'entry': entry,
             'token': context.get_ctx().auth_token,
+            'auth_url': self.conf.keystone_authtoken.auth_url
         }
 
         LOG.debug(

runtimes/python2/Dockerfile

@@ -1,7 +1,7 @@
 FROM alpine:3.5
 
 RUN apk update
-RUN apk add --no-cache python2 python2-dev build-base py2-pip
+RUN apk add --no-cache linux-headers python2 python2-dev build-base py2-pip py2-pbr
 RUN pip install --upgrade pip
 RUN rm -r /root/.cache
 

runtimes/python2/requirements.txt

@@ -1,3 +1,6 @@
-Flask>=0.11.1
+Flask>=0.10,!=0.11,<1.0  # BSD
-httplib2
+python-openstackclient>=3.3.0,!=3.10.0  # Apache-2.0
-requests>=2.7.0
+python-neutronclient>=6.3.0  # Apache-2.0
+python-swiftclient>=3.2.0  # Apache-2.0
+python-ceilometerclient>=2.5.0  # Apache-2.0
+keystoneauth1>=2.21.0  # Apache-2.0

runtimes/python2/server.py

@@ -23,12 +23,15 @@ from flask import abort
 from flask import Flask
 from flask import request
 from flask import Response
+from keystoneauth1.identity import generic
+from keystoneauth1 import session
 import requests
 
 app = Flask(__name__)
 zip_file = ''
 function_module = 'main'
 function_method = 'main'
+openstack_session = None
 
 
 @app.route('/download', methods=['POST'])
@@ -37,11 +40,17 @@ def download():
     function_id = request.form['function_id']
     entry = request.form['entry']
     token = request.form.get('token')
+    auth_url = request.form.get('auth_url')
 
     headers = {}
     if token:
         headers = {'X-Auth-Token': token}
 
+        # Get openstack session.
+        global openstack_session
+        auth = generic.Token(auth_url=auth_url, token=token)
+        openstack_session = session.Session(auth=auth, verify=False)
+
     global zip_file
     zip_file = '%s.zip' % function_id
 
@@ -73,6 +82,9 @@ def execute():
     global zip_file
     global function_module
     global function_method
+    global openstack_session
+
+    context = {'os_session': openstack_session}
 
     importer = zipimport.zipimporter(zip_file)
     module = importer.load_module(function_module)
@@ -88,10 +100,9 @@ def execute():
     start = time.time()
     try:
         func = getattr(module, function_method)
-        result = func(**input)
+        result = func(context=context, **input)
     except Exception as e:
         result = str(e)
-
     duration = time.time() - start
 
     return Response(

tox.ini

@@ -45,4 +45,4 @@ commands = oslo_debug_helper {posargs}
 ignore =
 show-source = true
 builtins = _
-exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,tools,build
+exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,tools,build,example