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package main
import (
"fmt"
"log"
"net/http"
"net/url"
)
// metricHandler prints all the metrics to the ResponseWriter
func metricHandler(w http.ResponseWriter, r *http.Request) {
var metricsString string
metricsString += fmt.Sprintf("nr_galaxies %d\n", len(treeArray))
for i := 0; i < len(starCount); i++ {
metricsString += fmt.Sprintf("galaxy_star_count{galaxy_nr=\"%d\"} %d\n", i, starCount[i])
}
log.Println(metricsString)
_, _ = fmt.Fprintf(w, metricsString)
}
// pushMetricsNumOfStars pushes the amount of stars in the given galaxy with the given index to the given host
// the host is (normally) the service bundling the metrics
func pushMetricsNumOfStars(host string, treeindex int64) {
// define a post-request and send it to the given host
requestURL := fmt.Sprintf("%s", host)
resp, err := http.PostForm(requestURL,
url.Values{
"key": {fmt.Sprintf("db_%s{nr=\"%s\"}", "stars_num", treeindex)},
"value": {fmt.Sprintf("%d", starCount[treeindex])},
},
)
if err != nil {
fmt.Printf("Cound not make a POST request to %s", requestURL)
}
// close the response body
defer resp.Body.Close()
}
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