// UpdateConfigSettings changes a service's charm config settings. Values set
// to nil will be deleted; unknown and invalid values will return an error.
func (s *Service) UpdateConfigSettings(changes charm.Settings) error {
charm, _, err := s.Charm()
if err != nil {
return err
}
changes, err = charm.Config().ValidateSettings(changes)
if err != nil {
return err
}
// TODO(fwereade) state.Settings is itself really problematic in just
// about every use case. This needs to be resolved some time; but at
// least the settings docs are keyed by charm url as well as service
// name, so the actual impact of a race is non-threatening.
node, err := readSettings(s.st, s.settingsKey())
if err != nil {
return err
}
for name, value := range changes {
if value == nil {
node.Delete(name)
} else {
node.Set(name, value)
}
}
_, err = node.Write()
return err
}
// ServiceGet returns the configuration for a service.
func (c *Client) ServiceGet(args params.ServiceGet) (params.ServiceGetResults, error) {
service, err := c.api.state.Service(args.ServiceName)
if err != nil {
return params.ServiceGetResults{}, err
}
settings, err := service.ConfigSettings()
if err != nil {
return params.ServiceGetResults{}, err
}
charm, _, err := service.Charm()
if err != nil {
return params.ServiceGetResults{}, err
}
configInfo := describe(settings, charm.Config())
var constraints constraints.Value
if service.IsPrincipal() {
constraints, err = service.Constraints()
if err != nil {
return params.ServiceGetResults{}, err
}
}
return params.ServiceGetResults{
Service: args.ServiceName,
Charm: charm.Meta().Name,
Config: configInfo,
Constraints: constraints,
}, nil
}
// CharmInfo returns information about the requested charm.
func (c *Client) CharmInfo(args params.CharmInfo) (api.CharmInfo, error) {
curl, err := charm.ParseURL(args.CharmURL)
if err != nil {
return api.CharmInfo{}, err
}
charm, err := c.api.state.Charm(curl)
if err != nil {
return api.CharmInfo{}, err
}
info := api.CharmInfo{
Revision: charm.Revision(),
URL: curl.String(),
Config: charm.Config(),
Meta: charm.Meta(),
}
return info, nil
}