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server.go
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server.go
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package api
import (
"fmt"
"net/http"
"net/url"
"strconv"
"github.com/elastic/beats/libbeat/beat"
"github.com/elastic/beats/libbeat/common"
"github.com/elastic/beats/libbeat/common/cfgwarn"
"github.com/elastic/beats/libbeat/logp"
"github.com/elastic/beats/libbeat/monitoring"
)
// Start starts the metrics api endpoint on the configured host and port
func Start(cfg *common.Config, info beat.Info) {
cfgwarn.Experimental("Metrics endpoint is enabled.")
config := DefaultConfig
cfg.Unpack(&config)
logp.Info("Starting stats endpoint")
go func() {
mux := http.NewServeMux()
// register handlers
mux.HandleFunc("/", rootHandler(info))
mux.HandleFunc("/stats", statsHandler)
url := config.Host + ":" + strconv.Itoa(config.Port)
logp.Info("Metrics endpoint listening on: %s", url)
endpoint := http.ListenAndServe(url, mux)
logp.Info("finished starting stats endpoint: %v", endpoint)
}()
}
func rootHandler(info beat.Info) func(http.ResponseWriter, *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
// Return error page
if r.URL.Path != "/" {
http.NotFound(w, r)
return
}
w.Header().Set("Content-Type", "application/json; charset=utf-8")
data := common.MapStr{
"version": info.Version,
"beat": info.Beat,
"name": info.Name,
"uuid": info.UUID,
"hostname": info.Hostname,
}
print(w, data, r.URL)
}
}
// statsHandler report expvar and all libbeat/monitoring metrics
func statsHandler(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json; charset=utf-8")
data := monitoring.CollectStructSnapshot(nil, monitoring.Full, false)
print(w, data, r.URL)
}
func print(w http.ResponseWriter, data common.MapStr, u *url.URL) {
query := u.Query()
if _, ok := query["pretty"]; ok {
fmt.Fprintf(w, data.StringToPrint())
} else {
fmt.Fprintf(w, data.String())
}
}