// Stop implements the TargetProvider interface.
func (dd *DNSDiscovery) Stop() {
log.Debug("Stopping DNS discovery for %s...", dd.names)
dd.ticker.Stop()
dd.done <- struct{}{}
log.Debug("DNS discovery for %s stopped.", dd.names)
}
// Run implements the TargetProvider interface.
func (md *MarathonDiscovery) Run(ch chan<- *config.TargetGroup) {
defer close(ch)
for {
select {
case <-md.done:
log.Debug("Shutting down marathon discovery.")
return
case <-time.After(md.refreshInterval):
err := md.updateServices(ch)
if err != nil {
log.Errorf("Error while updating services: %s", err)
}
}
}
}
func (e *periodicExporter) updateSlaves() {
log.Debug("discovering slaves...")
// This will redirect us to the elected mesos master
redirectURL := fmt.Sprintf("%s://%s/master/redirect", e.queryURL.Scheme, e.queryURL.Host)
rReq, err := http.NewRequest("GET", redirectURL, nil)
if err != nil {
panic(err)
}
tr := http.Transport{
DisableKeepAlives: true,
}
rresp, err := tr.RoundTrip(rReq)
if err != nil {
log.Warn(err)
return
}
defer rresp.Body.Close()
// This will/should return http://master.ip:5050
masterLoc := rresp.Header.Get("Location")
if masterLoc == "" {
log.Warnf("%d response missing Location header", rresp.StatusCode)
return
}
log.Debugf("current elected master at: %s", masterLoc)
// Starting from 0.23.0, a Mesos Master does not set the scheme in the "Location" header.
// Use the scheme from the master URL in this case.
var stateURL string
if strings.HasPrefix(masterLoc, "http") {
stateURL = fmt.Sprintf("%s/master/state.json", masterLoc)
} else {
stateURL = fmt.Sprintf("%s:%s/master/state.json", e.queryURL.Scheme, masterLoc)
}
var state masterState
// Find all active slaves
err = getJSON(&state, stateURL)
if err != nil {
log.Warn(err)
return
}
var slaveURLs []string
for _, slave := range state.Slaves {
if slave.Active {
// Extract slave port from pid
_, port, err := net.SplitHostPort(slave.PID)
if err != nil {
port = "5051"
}
url := fmt.Sprintf("http://%s:%s", slave.Hostname, port)
slaveURLs = append(slaveURLs, url)
}
}
log.Debugf("%d slaves discovered", len(slaveURLs))
e.slaves.Lock()
e.slaves.urls = slaveURLs
e.slaves.Unlock()
}
func (a *newRelicApi) req(path string, params string) ([]byte, error) {
u := a.server
u.Path = path
u.RawQuery = params
log.Debug("Making API call: ", u.String())
req := &http.Request{
Method: "GET",
URL: &u,
Header: http.Header{
"User-Agent": {UserAgent},
"X-Api-Key": {a.apiKey},
},
}
client := &http.Client{
Transport: &http.Transport{
TLSClientConfig: &tls.Config{
InsecureSkipVerify: TlsIgnore,
},
},
}
var data []byte
pageCount := 1
for page := 1; page <= pageCount; page++ {
resp, err := client.Do(req)
if err != nil {
return nil, err
}
if resp.StatusCode != 200 {
return nil, fmt.Errorf("Bad response code: %s", resp.Status)
}
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, err
}
resp.Body.Close()
data = append(data, body...)
link := resp.Header.Get("Link")
vals := LinkRexp.FindStringSubmatch(link)
if len(vals) == 3 { // Full string plus two sub-expressions
u, err := url.Parse(vals[2]) // Parse the second URL
if err != nil {
return nil, err
}
pageCount, err = strconv.Atoi(u.Query().Get("page"))
if err != nil {
return nil, err
}
}
qry := req.URL.Query()
qry.Set("page", strconv.Itoa(page+1))
req.URL.RawQuery = qry.Encode()
}
return data, nil
}
func (e *periodicExporter) updateSlaves() {
log.Debug("discovering slaves...")
// This will redirect us to the elected mesos master
redirectURL := fmt.Sprintf("%s/master/redirect", e.opts.masterURL)
rReq, err := http.NewRequest("GET", redirectURL, nil)
if err != nil {
panic(err)
}
tr := http.Transport{
DisableKeepAlives: true,
}
rresp, err := tr.RoundTrip(rReq)
if err != nil {
log.Warn(err)
return
}
defer rresp.Body.Close()
// This will/should return http://master.ip:5050
masterLoc := rresp.Header.Get("Location")
if masterLoc == "" {
log.Warnf("%d response missing Location header", rresp.StatusCode)
return
}
log.Debugf("current elected master at: %s", masterLoc)
// Find all active slaves
stateURL := fmt.Sprintf("%s/master/state.json", masterLoc)
resp, err := http.Get(stateURL)
if err != nil {
log.Warn(err)
return
}
defer resp.Body.Close()
type slave struct {
Active bool `json:"active"`
Hostname string `json:"hostname"`
Pid string `json:"pid"`
}
var req struct {
Slaves []*slave `json:"slaves"`
}
if err := json.NewDecoder(resp.Body).Decode(&req); err != nil {
log.Warnf("failed to deserialize request: %s", err)
return
}
var slaveURLs []string
for _, slave := range req.Slaves {
if slave.Active {
// Extract slave port from pid
_, port, err := net.SplitHostPort(slave.Pid)
if err != nil {
port = "5051"
}
url := fmt.Sprintf("http://%s:%s", slave.Hostname, port)
slaveURLs = append(slaveURLs, url)
}
}
log.Debugf("%d slaves discovered", len(slaveURLs))
e.slaves.Lock()
e.slaves.urls = slaveURLs
e.slaves.Unlock()
}