Single endpoint for web+ui (Issue #4). Migrated to modern protobuf+grpc.

internal/httpservers/singleFrontend.go

@@ -0,0 +1,50 @@
+package httpservers
+
+/*
+This file implements a very simple, lightweight reverse proxy so that REST and
+the webui can be accessed from a single endpoint.
+
+This makes external reverse proxies (treafik, haproxy, etc) easier, CORS goes
+away, and several other issues.
+*/
+
+import (
+	config "github.com/jamesread/OliveTin/internal/config"
+	log "github.com/sirupsen/logrus"
+	"net/http"
+	"net/http/httputil"
+	"net/url"
+)
+
+// StartSingleHTTPFrontend will create a reverse proxy that proxies the API
+// and webui internally.
+func StartSingleHTTPFrontend(cfg *config.Config) {
+	log.WithFields(log.Fields{
+		"address": cfg.ListenAddressSingleHTTPFrontend,
+	}).Info("Starting single HTTP frontend")
+
+	apiURL, _ := url.Parse("http://" + cfg.ListenAddressRestActions)
+	apiProxy := httputil.NewSingleHostReverseProxy(apiURL)
+
+	webuiURL, _ := url.Parse("http://" + cfg.ListenAddressWebUI)
+	webuiProxy := httputil.NewSingleHostReverseProxy(webuiURL)
+
+	mux := http.NewServeMux()
+
+	mux.HandleFunc("/api/", func(w http.ResponseWriter, r *http.Request) {
+		log.Debugf("api req: %v", r.URL)
+		apiProxy.ServeHTTP(w, r)
+	})
+
+	mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+		log.Debugf("ui req: %v", r.URL)
+		webuiProxy.ServeHTTP(w, r)
+	})
+
+	srv := &http.Server{
+		Addr:    cfg.ListenAddressSingleHTTPFrontend,
+		Handler: mux,
+	}
+
+	log.Fatal(srv.ListenAndServe())
+}