In order to support changes in the api-paste.ini file for the keystone
middleware of the neutron-api service by subordinates we need a generic
mechanism to pass wsgi middleware data via a relation.
The following approach is used in this change:
- relation data set by subordinates:
{'extra_middleware': [{
'type': 'middleware_type',
'name': 'middleware_name',
'config': {
'setting_1': 'value_1',
'setting_2': 'value_2'}}]}
- there may be many subordinates each with their own set of middleware
all of which should be taken into account
- besides a factory method for middleware other settings can be
specified, therefore, a generic config dictionary is used
- neutron-server has to be restarted as api-paste.ini is read upon
startup of the service
- api-paste.ini rendering code is added along with a template code
containing loops over a list of middleware provided in a context to
construct the following entries:
keystone = [name-1 ... name-m] <default_middleware>
[type-1:name-1]
key-1 = value-1
...
key-n = value-n
...
[type-m:name-m]
key-1 = value-1
...
key-k = value-k
- api-paste.ini defaults are copied from their respective upstream
neutron branches
Change-Id: I9449aa2e85b1523f24acdcee11ca1f635dda47c0
f3b655acdf