// fetchAllServicesAndUnits returns a map from service name to service,
// a map from service name to unit name to unit, and a map from base charm URL to latest URL.
func fetchAllServicesAndUnits(
st *state.State, unitMatcher unitMatcher) (
map[string]*state.Service, map[string]map[string]*state.Unit, map[charm.URL]string, error) {
svcMap := make(map[string]*state.Service)
unitMap := make(map[string]map[string]*state.Unit)
latestCharms := make(map[charm.URL]string)
services, err := st.AllServices()
if err != nil {
return nil, nil, nil, err
}
for _, s := range services {
units, err := s.AllUnits()
if err != nil {
return nil, nil, nil, err
}
svcUnitMap := make(map[string]*state.Unit)
for _, u := range units {
if !unitMatcher.matchUnit(u) {
continue
}
svcUnitMap[u.Name()] = u
}
if unitMatcher.matchesAny() || len(svcUnitMap) > 0 {
unitMap[s.Name()] = svcUnitMap
svcMap[s.Name()] = s
// Record the base URL for the service's charm so that
// the latest store revision can be looked up.
charmURL, _ := s.CharmURL()
if charmURL.Schema == "cs" {
latestCharms[*charmURL.WithRevision(-1)] = ""
}
}
}
for baseURL, _ := range latestCharms {
ch, err := st.LatestPlaceholderCharm(&baseURL)
if errors.IsNotFound(err) {
continue
}
if err != nil {
return nil, nil, nil, err
}
latestCharms[baseURL] = ch.String()
}
return svcMap, unitMap, latestCharms, nil
}