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package main
import (
"fmt"
"log"
"net/http"
"strings"
"github.com/gorilla/mux"
)
func setupHTTPServer(config config) {
// start the http server logging the metrics
log.Printf("Starting HTTP metrics listener on port %d", config.httpPort)
r := mux.NewRouter()
r.HandleFunc("/", indexHandler)
r.HandleFunc("/metrics", metricsHandler)
r.HandleFunc("/locations", locationHandlerEndpoint)
// start the http server exposing the metrics and the locations
httpPortString := fmt.Sprintf("%s:%d", config.bindIP, config.httpPort)
listenErr := http.ListenAndServe(httpPortString, r)
// handle potential errors
if listenErr != nil {
log.Fatalln(listenErr.Error())
}
}
// locationHandlerEndpoint handles requests to the /locations endpoint
// This is used by the grafana worldmap plugin to find out where to draw the
// fancy circles
func locationHandlerEndpoint(w http.ResponseWriter, r *http.Request) {
// set some headers
w.Header().Set("Content-Type", "application/json")
w.Header().Set("Access-Control-Allow-Origin", "https://grafana.nbg1.emile.space")
// start building json (yes, this is not a nice implementation, PRs welcome!)
fmt.Fprintf(w, "%s", "[")
var i int = 0
for _, v := range cities {
// print the "json" object containing the metrics needed
fmt.Fprintf(w, "{")
fmt.Fprintf(w, "\"key\": \"%s\",", v.key)
fmt.Fprintf(w, "\"latitude\": %f,", v.latitude)
fmt.Fprintf(w, "\"longitude\": %f,", v.longitude)
fmt.Fprintf(w, "\"name\": \"%s\"", v.name)
// close the object (this handles the trailing comma problem)
if i == len(cities)-1 {
fmt.Fprintf(w, "}")
} else {
fmt.Fprintf(w, "},")
}
i++
}
fmt.Fprintf(w, "%s", "]")
}
// indexHandler handles the request to the / endpoint
// It simply returns a link to the /metrics page
func indexHandler(w http.ResponseWriter, req *http.Request) {
_, _ = fmt.Fprintf(w, "<a href='/metrics'>metrics</a>")
}
// Handle HTTP requests to the /metrics endpoint
func metricsHandler(w http.ResponseWriter, req *http.Request) {
// return the overall amount of passwords catched
fmt.Fprintf(w, "num_passwords %d\n", metricsNumPasswords)
// return the amount of passwords catched from a given city
for k, v := range metricsCityNum {
fmt.Fprintf(w, "a_metric{city=\"%s\"} %d\n", strings.ToLower(k), v)
}
}
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