add osrm to routing service (#86)

routing/main.go

@@ -17,22 +17,48 @@ func main() {
 		service.Version("latest"),
 	)
 
-	// Setup google maps
-	c, err := config.Get("google.apikey")
+	// decide whether to use google or osrm
+	c, err := config.Get("routing.mode")
 	if err != nil {
 		logger.Fatalf("Error loading config: %v", err)
 	}
-	apiKey := c.String("")
-	if len(apiKey) == 0 {
-		logger.Fatalf("Missing required config: google.apikey")
-	}
-	m, err := maps.NewClient(maps.WithAPIKey(apiKey))
-	if err != nil {
-		logger.Fatalf("Error configuring google maps client: %v", err)
-	}
+	// defaults to google
+	mode := c.String("google")
 
-	// Register handler
-	pb.RegisterRoutingHandler(srv.Server(), &handler.Routing{m})
+	switch mode {
+	case "google":
+		// Setup google maps
+		c, err := config.Get("google.api.key")
+		if err != nil {
+			logger.Fatalf("Error loading config: %v", err)
+		}
+		apiKey := c.String("")
+		if len(apiKey) == 0 {
+			logger.Fatalf("Missing required config: google.apikey")
+		}
+		m, err := maps.NewClient(maps.WithAPIKey(apiKey))
+		if err != nil {
+			logger.Fatalf("Error configuring google maps client: %v", err)
+		}
+
+		// Register handler
+		pb.RegisterRoutingHandler(srv.Server(), &handler.Google{m})
+	case "osrm":
+		// todo
+		// Setup google maps
+		c, err := config.Get("routing.address")
+		if err != nil {
+			logger.Fatalf("Error loading config: %v", err)
+		}
+		apiAddr := c.String("http://router.project-osrm.org")
+		if len(apiAddr) == 0 {
+			logger.Fatalf("Missing required config: osrm.api.address")
+		}
+		// Register handler
+		pb.RegisterRoutingHandler(srv.Server(), &handler.OSRM{Address: apiAddr})
+	default:
+		logger.Fatalf("%s is an unsupported mode", mode)
+	}
 
 	// Run service
 	if err := srv.Run(); err != nil {