// GetLookupdTopics returns a []string containing a union of all the topics
// from all the given lookupd
func (c *ClusterInfo) GetLookupdTopics(lookupdHTTPAddrs []string) ([]string, error) {
var success bool
var allTopics []string
var lock sync.Mutex
var wg sync.WaitGroup
type respType struct {
Topics []string `json:"topics"`
}
for _, addr := range lookupdHTTPAddrs {
wg.Add(1)
endpoint := fmt.Sprintf("http://%s/topics", addr)
c.logf("LOOKUPD: querying %s", endpoint)
go func(endpoint string) {
defer wg.Done()
var resp respType
err := http_api.NegotiateV1(endpoint, &resp)
if err != nil {
c.logf("ERROR: lookupd %s - %s", endpoint, err)
return
}
lock.Lock()
defer lock.Unlock()
success = true
allTopics = append(allTopics, resp.Topics...)
}(endpoint)
}
wg.Wait()
if success == false {
return nil, errors.New("unable to query any lookupd")
}
allTopics = stringy.Uniq(allTopics)
sort.Strings(allTopics)
return allTopics, nil
}
// GetLookupdTopicChannels returns a []string containing a union of the channels
// from all the given lookupd for the given topic
func (c *ClusterInfo) GetLookupdTopicChannels(topic string, lookupdHTTPAddrs []string) ([]string, error) {
var success bool
var allChannels []string
var lock sync.Mutex
var wg sync.WaitGroup
type respType struct {
Channels []string `json:"channels"`
}
for _, addr := range lookupdHTTPAddrs {
wg.Add(1)
endpoint := fmt.Sprintf("http://%s/channels?topic=%s", addr, url.QueryEscape(topic))
c.logf("LOOKUPD: querying %s", endpoint)
go func(endpoint string) {
defer wg.Done()
var resp respType
err := c.client.NegotiateV1(endpoint, &resp)
lock.Lock()
defer lock.Unlock()
if err != nil {
c.logf("ERROR: lookupd %s - %s", endpoint, err)
return
}
success = true
allChannels = append(allChannels, resp.Channels...)
}(endpoint)
}
wg.Wait()
if success == false {
return nil, errors.New("unable to query any lookupd")
}
allChannels = stringy.Uniq(allChannels)
sort.Strings(allChannels)
return allChannels, nil
}
