// Update decodes the collect-statse(8) parts of the config.
func Update(config_ *config.Config) error {
return config_.UpdateHost(func(hostID string, elem *config.Element) error {
hc := new(HostConfig)
if err := xml.Unmarshal(elem.Raw, hc); err != nil {
return nil
}
if err := hc.validate(); err != nil {
return fmt.Errorf("host %s: statse: %v", hostID, err)
}
elem.Value = hc
return nil
})
}
// aggregator returns the host responsible for aggregation of flows
// for the given forwarder host.
func aggregator(forwarder *config.Host, config *config.Config) (*config.Host, bool) {
for _, host := range config.Cluster(forwarder.ClusterID) {
hc, ok := hostConfig(host)
if !ok {
continue
}
if hc.Aggregator {
return host, true
}
}
return nil, false
}
// updateHost extends the provided common config with host-level Process elements.
func updateHost(config_ *config.Config) error {
global := make(config.Namespace)
before := make(config.Namespace)
for id := range config_.Hosts.NS {
before[id] = true
}
// Decode <process> elements.
err := config_.UpdateHost(func(hostID string, elem *config.Element) error {
p := new(Process)
if err := xml.Unmarshal(elem.Raw, p); err != nil {
return nil
}
if err := p.validate(); err != nil {
return fmt.Errorf("host %s: %v", hostID, err)
}
config_.Hosts.NS[p.ID] = true
global[p.ID] = true
elem.Value = p
return nil
})
if err != nil {
return err
}
// Ensure no naming ambiguity exists.
count := make(map[string]int)
for id := range global {
count[id]++
}
for id := range before {
count[id]++
}
for id := range count {
if count[id] > 1 {
return fmt.Errorf("identifier redeclared: %v", id)
}
}
return nil
}
// newView returns an initial view containing common settings.
func newView(key *Key, config *config.Config) (*View, error) {
host, err := config.Host(key.Host)
if err != nil {
return nil, err
}
view := &View{
Relay: make(map[string]*Relay),
}
// Load custom filter rules.
err = config.Filter.Run(&view.Filter, key.Program, host.ID, host.ClusterID)
if err != nil {
return nil, &internalError{err}
}
// Add host tag if missing.
view.Filter = append(view.Filter, &Rule{
Match: []string{"", "host", "^$"},
Set: []string{"", "host", host.ID},
})
return view, nil
}