Add support for mistral-lib to Mistral

This patch wont pass CI until mistral-lib is packaged for the TripleO
CI.

Depends-On-External: https://review.rdoproject.org/r/6266
Depends-On: Icec6d1a3c483a30e9e3fa3175ed0233053c69daa
Change-Id: Iab8d093f53477585e60a99413ed5379fb7e5b4ae

mistral/executors/default_executor.py

@@ -16,7 +16,10 @@
 from oslo_log import log as logging
 from osprofiler import profiler
 
+from mistral_lib import actions as mistral_lib
+
 from mistral.actions import action_factory as a_f
+from mistral import context
 from mistral import exceptions as exc
 from mistral.executors import base
 from mistral.rpc import clients as rpc
@@ -99,7 +102,14 @@ class DefaultExecutor(base.Executor):
 
         # Run action.
         try:
-            result = action.run()
+
+            # NOTE(d0ugal): If the action is a subclass of mistral-lib we know
+            # that it expects to be passed the context. We should deprecate
+            # the builtin action class in Mistral.
+            if isinstance(action, mistral_lib.Action):
+                result = action.run(context.ctx())
+            else:
+                result = action.run()
 
             # Note: it's made for backwards compatibility with already
             # existing Mistral actions which don't return result as

requirements.txt

@@ -12,6 +12,7 @@ gnocchiclient>=2.7.0 # Apache-2.0
 Jinja2!=2.9.0,!=2.9.1,!=2.9.2,!=2.9.3,!=2.9.4,>=2.8 # BSD License (3 clause)
 jsonschema!=2.5.0,<3.0.0,>=2.0.0 # MIT
 keystonemiddleware>=4.12.0 # Apache-2.0
+mistral-lib>=0.1.0 # Apache-2.0
 networkx>=1.10 # BSD
 oslo.concurrency>=3.8.0 # Apache-2.0
 oslo.config>=3.22.0 # Apache-2.0