// GetLookupdTopicChannels returns a []string containing a union of the channels
// from all the given lookupd for the given topic
func GetLookupdTopicChannels(topic string, lookupdHTTPAddrs []string) ([]string, error) {
success := false
allChannels := make([]string, 0)
var lock sync.Mutex
var wg sync.WaitGroup
for _, addr := range lookupdHTTPAddrs {
wg.Add(1)
endpoint := fmt.Sprintf("http://%s/channels?topic=%s", addr, url.QueryEscape(topic))
log.Printf("LOOKUPD: querying %s", endpoint)
go func(endpoint string) {
data, err := util.ApiRequest(endpoint)
lock.Lock()
defer lock.Unlock()
defer wg.Done()
if err != nil {
log.Printf("ERROR: lookupd %s - %s", endpoint, err.Error())
return
}
success = true
// {"data":{"channels":["test"]}}
channels, _ := data.Get("channels").StringArray()
allChannels = util.StringUnion(allChannels, channels)
}(endpoint)
}
wg.Wait()
sort.Strings(allChannels)
if success == false {
return nil, errors.New("unable to query any lookupd")
}
return allChannels, nil
}
func getLookupdTopics(lookupdHTTPAddrs []string) ([]string, error) {
success := false
allTopics := make([]string, 0)
var lock sync.Mutex
var wg sync.WaitGroup
for _, addr := range lookupdHTTPAddrs {
wg.Add(1)
endpoint := fmt.Sprintf("http://%s/topics", addr)
log.Printf("LOOKUPD: querying %s", endpoint)
go func(endpoint string) {
data, err := nsq.ApiRequest(endpoint)
lock.Lock()
defer lock.Unlock()
defer wg.Done()
if err != nil {
log.Printf("ERROR: lookupd %s - %s", endpoint, err.Error())
return
}
success = true
// {"data":{"topics":["test"]}}
// TODO: convert this to a StringArray() function in simplejson
topics, _ := data.Get("topics").Array()
allTopics = util.StringUnion(allTopics, topics)
}(endpoint)
}
wg.Wait()
sort.Strings(allTopics)
if success == false {
return nil, errors.New("unable to query any lookupd")
}
return allTopics, nil
}
