chore(tfstated): refactor backend code to a dedicated package

pkg/backend/run.go

@@ -0,0 +1,51 @@
+package backend
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"log"
+	"net"
+	"net/http"
+
+	"git.adyxax.org/adyxax/tfstated/pkg/database"
+	"git.adyxax.org/adyxax/tfstated/pkg/logger"
+)
+
+func Run(
+	ctx context.Context,
+	db *database.DB,
+	//args []string,
+	getenv func(string) string,
+	//stdin io.Reader,
+	//stdout io.Writer,
+	stderr io.Writer,
+) *http.Server {
+	mux := http.NewServeMux()
+	addRoutes(
+		mux,
+		db,
+	)
+
+	host := getenv("TFSTATED_HOST")
+	if host == "" {
+		host = "127.0.0.1"
+	}
+	port := getenv("TFSTATED_PORT")
+	if port == "" {
+		port = "8080"
+	}
+
+	httpServer := &http.Server{
+		Addr:    net.JoinHostPort(host, port),
+		Handler: logger.Middleware(mux, false),
+	}
+	go func() {
+		log.Printf("listening on %s\n", httpServer.Addr)
+		if err := httpServer.ListenAndServe(); err != nil && err != http.ErrServerClosed {
+			_, _ = fmt.Fprintf(stderr, "error listening and serving: %+v\n", err)
+		}
+	}()
+
+	return httpServer
+}