started with endpoint handlers

backend/api.go

@@ -0,0 +1,83 @@
+package main
+
+import (
+	"compress/gzip"
+	"encoding/json"
+	"net/http"
+	"strings"
+
+	"github.com/ecix/alice-lg/backend/api"
+
+	"github.com/julienschmidt/httprouter"
+)
+
+// Alice LG Rest API
+//
+// The API provides endpoints for getting
+// information from the routeservers / alice datasources.
+//
+// Endpoints:
+//
+//   Config
+//     Show         /api/config
+//
+//   Routeservers
+//     List         /api/routeservers
+//     Status       /api/routeservers/:id/status
+//     Neighbours   /api/routeservers/:id/neighbours
+//     Routes       /api/routeservers/:id/neighbours/:neighbour_id/routes
+//
+
+type apiEndpoint func(*http.Request, httprouter.Params) (interface{}, error)
+
+// Wrap handler for access controll, throtteling and compression
+func endpoint(wrapped apiEndpoint) httprouter.Handle {
+	return func(res http.ResponseWriter,
+		req *http.Request,
+		params httprouter.Params) {
+
+		// Get result from handler
+		result, err := wrapped(req, params)
+		if err != nil {
+			result = api.ErrorResponse{
+				Error: err.Error(),
+			}
+			payload, _ := json.Marshal(result)
+			http.Error(res, string(payload), http.StatusInternalServerError)
+			return
+		}
+
+		// Encode json
+		payload, err := json.Marshal(result)
+
+		// Set response header
+		res.Header().Set("Content-Type", "application/json")
+
+		// Check if compression is supported
+		if strings.Contains(req.Header.Get("Accept-Encoding"), "gzip") {
+			// Compress response
+			res.Header().Set("Content-Encoding", "gzip")
+			gz := gzip.NewWriter(res)
+			defer gz.Close()
+			gz.Write(payload)
+		} else {
+			res.Write(payload) // Fall back to uncompressed response
+		}
+	}
+}
+
+// Register api endpoints
+func apiRegisterEndpoints(router *httprouter.Router) error {
+
+	// Config
+	router.GET("/api/config", endpoint(apiConfigShow))
+
+	// Routeservers
+
+	return nil
+}
+
+// Handle Config Endpoint
+func apiConfigShow(_req *http.Request, _params httprouter.Params) (interface{}, error) {
+	return "Everythings fine."
+}

backend/main.go

@@ -22,6 +22,11 @@ func main() {
 		log.Fatal(err)
 	}
 
+	err = apiRegisterEndpints(router)
+	if err != nil {
+		log.Fatal(err)
+	}
+
 	// Start http server
 	log.Fatal(http.ListenAndServe(":7340", router))
 }