Very basic status service

cmd/relaysrv/status.go

@@ -0,0 +1,39 @@
+package main
+
+import (
+	"encoding/json"
+	"log"
+	"net/http"
+	"runtime"
+	"sync/atomic"
+)
+
+func statusService(addr string) {
+	http.HandleFunc("/status", getStatus)
+	if err := http.ListenAndServe(addr, nil); err != nil {
+		log.Fatal(err)
+	}
+}
+
+func getStatus(w http.ResponseWriter, r *http.Request) {
+	status := make(map[string]interface{})
+
+	sessionMut.Lock()
+	status["numSessions"] = len(sessions)
+	sessionMut.Unlock()
+	status["numProxies"] = atomic.LoadInt64(&numProxies)
+	status["bytesProxied"] = atomic.LoadInt64(&bytesProxied)
+	status["goVersion"] = runtime.Version()
+	status["goOS"] = runtime.GOOS
+	status["goAarch"] = runtime.GOARCH
+	status["goMaxProcs"] = runtime.GOMAXPROCS(-1)
+
+	bs, err := json.MarshalIndent(status, "", "    ")
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	w.Write(bs)
+}