Preliminary web server

http/http.go

@@ -0,0 +1,52 @@
+package http
+
+import (
+	"fmt"
+	"gemini-grc/logging"
+	_ "gemini-grc/logging"
+	"net/http"
+	"time"
+)
+
+func CreateServer(listenAddr string) *http.Server {
+	mux := http.NewServeMux()
+	mux.HandleFunc("GET /ping", wrapForError(getPing))
+
+	server := &http.Server{
+		Addr:              listenAddr,
+		Handler:           mux,
+		ReadHeaderTimeout: 10 * time.Second,
+	}
+
+	go func() {
+		// Start the server. Blocking call.
+		logging.LogInfo("HTTP server listening on %s", listenAddr)
+		if err := server.ListenAndServe(); err != nil {
+			panic(fmt.Sprintf("Server failed to start: %s", err))
+		}
+	}()
+	return server
+}
+
+func wrapForError(f func(http.ResponseWriter, *http.Request) error) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		err := f(w, r)
+		if err != nil {
+			code := http.StatusInternalServerError
+			logging.LogWarn("Error while handling request: %d %s", code, err)
+			http.Error(w, http.StatusText(code), code)
+		}
+	}
+}
+
+func getPing(w http.ResponseWriter, r *http.Request) error {
+	method := r.Method
+	url := r.URL.String()
+	path := r.URL.Path
+	response := fmt.Sprintf("Pong %s %s %s", method, url, path)
+	_, err := w.Write([]byte(response))
+	if err != nil {
+		return fmt.Errorf("failed to write response: %w", err)
+	}
+	return nil
+}