func (s *BindingsSuite) TestCombinedCharmRelations(c *gc.C) {
_, err := state.CombinedCharmRelations(nil)
c.Check(err, gc.ErrorMatches, "nil charm metadata")
meta := s.newMeta
allRelations, err := state.CombinedCharmRelations(meta)
c.Check(err, jc.ErrorIsNil)
combinedLength := len(meta.Provides) + len(meta.Requires) + len(meta.Peers)
c.Check(allRelations, gc.HasLen, combinedLength)
c.Check(allRelations, jc.DeepEquals, map[string]charm.Relation{
"foo1": meta.Provides["foo1"],
"foo2": meta.Provides["foo2"],
"bar2": meta.Requires["bar2"],
"bar3": meta.Requires["bar3"],
"self": meta.Peers["self"],
"me": meta.Peers["me"],
})
}
func getEffectiveBindingsForCharmMeta(charmMeta *charm.Meta, givenBindings map[string]string) (map[string]string, error) {
combinedEndpoints, err := state.CombinedCharmRelations(charmMeta)
if err != nil {
return nil, errors.Trace(err)
}
if givenBindings == nil {
givenBindings = make(map[string]string, len(combinedEndpoints))
}
// Get the service-level default binding for all unspecified endpoint, if
// set, otherwise use the empty default.
serviceDefaultSpace, _ := givenBindings[""]
effectiveBindings := make(map[string]string, len(combinedEndpoints))
for endpoint, _ := range combinedEndpoints {
if givenSpace, isGiven := givenBindings[endpoint]; isGiven {
effectiveBindings[endpoint] = givenSpace
} else {
effectiveBindings[endpoint] = serviceDefaultSpace
}
}
return effectiveBindings, nil
}