kubernetes-sigs/prometheus-adapter
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Add --prometheus-verb to support POST requests to prometheus servers

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This commit is contained in:
Kazuhiro Suzuki 2022-06-28 01:51:05 +09:00
parent 9008b12a01
commit a8742cff28
2 changed files with 37 additions and 12 deletions
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11
cmd/adapter/adapter.go
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@ -74,6 +74,8 @@ type PrometheusAdapter struct {
PrometheusTokenFile string
// PrometheusHeaders is a k=v list of headers to set on requests to PrometheusURL
PrometheusHeaders []string
// PrometheusVerb is a verb to set on requests to PrometheusURL
PrometheusVerb string
// AdapterConfigFile points to the file containing the metrics discovery configuration.
AdapterConfigFile string
// MetricsRelistInterval is the interval at which to relist the set of available metrics
@ -90,6 +92,10 @@ func (cmd *PrometheusAdapter) makePromClient() (prom.Client, error) {
return nil, fmt.Errorf("invalid Prometheus URL %q: %v", baseURL, err)
}
if cmd.PrometheusVerb != http.MethodGet && cmd.PrometheusVerb != http.MethodPost {
return nil, fmt.Errorf("unsupported Prometheus Http Verb %q", cmd.PrometheusVerb)
}
var httpClient *http.Client
if cmd.PrometheusCAFile != "" {
@ -117,7 +123,7 @@ func (cmd *PrometheusAdapter) makePromClient() (prom.Client, error) {
}
genericPromClient := prom.NewGenericAPIClient(httpClient, baseURL, parseHeaderArgs(cmd.PrometheusHeaders))
instrumentedGenericPromClient := mprom.InstrumentGenericAPIClient(genericPromClient, baseURL.String())
return prom.NewClientForAPI(instrumentedGenericPromClient), nil
return prom.NewClientForAPI(instrumentedGenericPromClient, cmd.PrometheusVerb), nil
}
func (cmd *PrometheusAdapter) addFlags() {
@ -137,6 +143,8 @@ func (cmd *PrometheusAdapter) addFlags() {
"Optional file containing the bearer token to use when connecting with Prometheus")
cmd.Flags().StringArrayVar(&cmd.PrometheusHeaders, "prometheus-header", cmd.PrometheusHeaders,
"Optional header to set on requests to prometheus-url. Can be repeated")
cmd.Flags().StringVar(&cmd.PrometheusVerb, "prometheus-verb", cmd.PrometheusVerb,
"HTTP Verb to set on requests to Prometheus.")
cmd.Flags().StringVar(&cmd.AdapterConfigFile, "config", cmd.AdapterConfigFile,
"Configuration file containing details of how to transform between Prometheus metrics "+
"and custom metrics API resources")
@ -274,6 +282,7 @@ func main() {
// set up flags
cmd := &PrometheusAdapter{
PrometheusURL: "https://localhost",
PrometheusVerb: http.MethodGet,
MetricsRelistInterval: 10 * time.Minute,
}
cmd.Name = "prometheus-metrics-adapter"