// AddRelation adds a relation between the specified endpoint names, and
// returns a map from service names to relation endpoints.
func AddRelation(state *state.State, args params.AddRelation) (params.AddRelationResults, error) {
inEps, err := state.InferEndpoints(args.Endpoints)
if err != nil {
return params.AddRelationResults{}, err
}
rel, err := state.AddRelation(inEps...)
if err != nil {
return params.AddRelationResults{}, err
}
outEps := make(map[string]charm.Relation)
for _, inEp := range inEps {
outEp, err := rel.Endpoint(inEp.ServiceName)
if err != nil {
return params.AddRelationResults{}, err
}
outEps[inEp.ServiceName] = outEp.Relation
}
return params.AddRelationResults{Endpoints: outEps}, nil
}