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Allow client to scrape a custom target while advertising a different FQDN #80

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Allow client to scrape a custom target while advertising a different FQDN #80

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13 changes: 13 additions & 0 deletions cmd/client/main.go
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Original file line number Diff line number Diff line change
Expand Up @@ -49,6 +49,7 @@ var (
tlsCert = kingpin.Flag("tls.cert", "<cert> Client certificate file").String()
tlsKey = kingpin.Flag("tls.key", "<key> Private key file").String()
metricsAddr = kingpin.Flag("metrics-addr", "Serve Prometheus metrics at this address").Default(":9369").String()
target = kingpin.Flag("target", "Scraping target").String()

retryInitialWait = kingpin.Flag("proxy.retry.initial-wait", "Amount of time to wait after proxy failure").Default("1s").Duration()
retryMaxWait = kingpin.Flag("proxy.retry.max-wait", "Maximum amount of time to wait between proxy poll retries").Default("5s").Duration()
Expand Down Expand Up @@ -133,6 +134,14 @@ func (c *Coordinator) doScrape(request *http.Request, client *http.Client) {
return
}

if *target != "" {
if request.URL.Port() == "" {
request.URL.Host = *target
} else {
request.URL.Host = *target + ":" + request.URL.Port()
}
}

scrapeResp, err := client.Do(request)
if err != nil {
msg := fmt.Sprintf("failed to scrape %s", request.URL.String())
Expand Down Expand Up @@ -280,6 +289,10 @@ func main() {
}()
}

if *target != "" {
level.Info(coordinator.logger).Log("msg", "Scraping target", "target", *target)
}

transport := &http.Transport{
Proxy: http.ProxyFromEnvironment,
DialContext: (&net.Dialer{
Expand Down