/
main.go
109 lines (84 loc) · 2.47 KB
/
main.go
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package main
import (
"flag"
"github.com/flexshopper/newrelic-custom-metrics/newrelic"
"io/ioutil"
"net/http"
"os"
"strconv"
"github.com/golang/glog"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/apiserver/pkg/util/logs"
nrProvider "github.com/flexshopper/newrelic-custom-metrics/provider"
basecmd "github.com/kubernetes-incubator/custom-metrics-apiserver/pkg/cmd"
"github.com/kubernetes-incubator/custom-metrics-apiserver/pkg/provider"
)
type NewrelicAdapter struct {
basecmd.AdapterBase
// Message is printed on successful startup
Message string
}
type HttpGetClient struct {
}
func (HttpGetClient) Fetch(url string, headers map[string]string, params map[string]string) ([]byte, error) {
client := http.Client{}
req, err := http.NewRequest(http.MethodGet, url, nil)
if err != nil {
return []byte{}, err
}
for k, v := range headers {
req.Header.Set(k, v)
}
q := req.URL.Query()
for k, v := range params {
q.Set(k, v)
}
req.URL.RawQuery = q.Encode()
res, err := client.Do(req)
if err != nil {
return []byte{}, err
}
body, err := ioutil.ReadAll(res.Body)
glog.Infof("Request made to %s with params %v, response was: %s", url, params, body)
if err != nil {
return []byte{}, err
}
return body, nil
}
func (a *NewrelicAdapter) makeProviderOrDie() provider.ExternalMetricsProvider {
client, err := a.DynamicClient()
if err != nil {
glog.Fatalf("unable to construct dynamic client: %v", err)
}
mapper, err := a.RESTMapper()
if err != nil {
glog.Fatalf("unable to construct discovery REST mapper: %v", err)
}
newrelicApiKey := os.Getenv("NEWRELIC_API_KEY")
if newrelicApiKey == "" {
glog.Fatalf("NEWRELIC_API_KEY env var must be set")
}
minRpm := 0
minRpmArg := os.Getenv("MIN_RPM")
if minRpmArg != "" {
minRpm, err = strconv.Atoi(minRpmArg)
if err != nil {
glog.Warningf("Could parse MIN_RPM to int, defaulting to %d", minRpm)
}
}
return nrProvider.NewProvider(client, mapper, newrelic.NewApi(newrelicApiKey, minRpm, HttpGetClient{}))
}
func main() {
logs.InitLogs()
defer logs.FlushLogs()
cmd := &NewrelicAdapter{}
cmd.Flags().StringVar(&cmd.Message, "msg", "starting adapter...", "startup message")
cmd.Flags().AddGoFlagSet(flag.CommandLine) // make sure we get the glog flags
cmd.Flags().Parse(os.Args)
newrelicProvider := cmd.makeProviderOrDie()
cmd.WithExternalMetrics(newrelicProvider)
glog.Infof(cmd.Message)
if err := cmd.Run(wait.NeverStop); err != nil {
glog.Fatalf("unable to run custom metrics adapter: %v", err)
}
}