func (*statusContext) processRelations(service *state.Service) (related map[string][]string, subord []string, err error) {
// TODO(mue) This way the same relation is read twice (for each service).
// Maybe add Relations() to state, read them only once and pass them to each
// call of this function.
relations, err := service.Relations()
if err != nil {
return nil, nil, err
}
var subordSet set.Strings
related = make(map[string][]string)
for _, relation := range relations {
ep, err := relation.Endpoint(service.Name())
if err != nil {
return nil, nil, err
}
relationName := ep.Relation.Name
eps, err := relation.RelatedEndpoints(service.Name())
if err != nil {
return nil, nil, err
}
for _, ep := range eps {
if ep.Scope == charm.ScopeContainer && !service.IsPrincipal() {
subordSet.Add(ep.ServiceName)
}
related[relationName] = append(related[relationName], ep.ServiceName)
}
}
for relationName, serviceNames := range related {
sn := set.NewStrings(serviceNames...)
related[relationName] = sn.SortedValues()
}
return related, subordSet.SortedValues(), nil
}
// collect calls f on all values in src and returns an alphabetically
// ordered list of the returned results without duplicates.
func (src List) collect(f func(*Tools) string) []string {
var seen set.Strings
for _, tools := range src {
seen.Add(f(tools))
}
return seen.SortedValues()
}
// Helper methods for the tests.
func AssertValues(c *C, s set.Strings, expected ...string) {
values := s.Values()
// Expect an empty slice, not a nil slice for values.
if expected == nil {
expected = []string{}
}
sort.Strings(expected)
sort.Strings(values)
c.Assert(values, DeepEquals, expected)
c.Assert(s.Size(), Equals, len(expected))
// Check the sorted values too.
sorted := s.SortedValues()
c.Assert(sorted, DeepEquals, expected)
}