Add LISTEN_ADDRESS env variables and set to 127.0.0.1 by default (dev…

… environments)

By only listening on the loopback address, we avoid the prompt about incoming networking connections from MacOS and other OSs.
See nodejs/node#37233

.envrc

@@ -1,6 +1,6 @@
 export SQLITE_DATA_DIR=data
 export CACHE_SIZE=100
-
+export LISTEN_ADDRESS=127.0.0.1
 
 echo "Successfully loaded .envrc"
 

httpserver.go

@@ -29,13 +29,15 @@ func (app app) httpServer(onPanic func(error)) *http.Server {
 		port = "8080"
 	}
 
+	listenAddress := os.Getenv("LISTEN_ADDRESS")
+
 	staticRoot, err := fs.Sub(staticFS, "static")
 	if err != nil {
 		LogFatal(l, "fs.Sub", err)
 	}
 
 	server := &http.Server{
-		Addr:              ":" + port,
+		Addr:              listenAddress + ":" + port,
 		WriteTimeout:      writeTimeout,
 		ReadHeaderTimeout: readHeaderTimeout,
 	}

prometheus.go

@@ -3,6 +3,7 @@ package main
 import (
 	"context"
 	"net/http"
+	"os"
 	"time"
 
 	"github.com/VictoriaMetrics/metrics"
@@ -31,8 +32,10 @@ func servePrometheusMetrics() func(ctx context.Context) error {
 		metrics.WritePrometheus(w, true)
 	})
 
+	listenAddress := os.Getenv("LISTEN_ADDRESS")
+
 	s := &http.Server{
-		Addr:    ":9091",
+		Addr:    listenAddress + ":9091",
 		Handler: mux,
 	}