v2 initial server ping solution

coolfacts/cmd/coolfacts_server/server.go

@@ -1,6 +1,8 @@
 package main
 
 import (
+	"encoding/json"
+	"fmt"
 	"log"
 	"net/http"
 	"strings"
@@ -9,7 +11,7 @@ import (
 type server struct{}
 
 func NewServer() *server {
-	// TODO: return an initialized server with the factsService
+	return &server{}
 }
 
 func (s *server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
@@ -31,30 +33,39 @@ func (s *server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 func (s *server) HandlePing(w http.ResponseWriter, _ *http.Request) {
 	log.Println("Handling Ping ...")
 
-	// TODO
-	// 1. write status header 200 using constant http.StatusOK
-	// 3. write ping
+	w.WriteHeader(http.StatusOK)
+
+	if _, err := fmt.Fprint(w, "PONG"); err != nil {
+		fmt.Printf("ERROR writing to ResponseWriter: %s\n", err)
+		return
+	}
 }
 
 func (s *server) HandleNotFound(w http.ResponseWriter, r *http.Request) {
 	log.Println("Handling notFound ...")
-	// TODO:
-	// 1. write status header 404 using
-	// 2. set content type application/json
-	// 3. write json indicating an error:
-	//   {
-	//       error: path <http method + path> not found
-	//   }
+
+	w.WriteHeader(http.StatusNotFound)
+	w.Header().Set("Content-Type", "application/json")
+
+	response := map[string]string{
+		"error": fmt.Sprintf("path %s %s not found", r.Method, r.URL.Path),
+	}
+
+	if err := json.NewEncoder(w).Encode(response); err != nil {
+		err = fmt.Errorf("HandleNotFound failed to decode: %s", err)
+		s.HandleError(w, err)
+	}
 }
 
 func (s *server) HandleError(w http.ResponseWriter, err error) {
 	log.Println("Handling error ...")
 
-	// TODO:
-	// 1. write status header 500
-	// 2. set content type application/json
-	// 3. write json indicating an error:
-	//   {
-	//       error: <the error message>
-	//   }
+	w.WriteHeader(http.StatusInternalServerError)
+	w.Header().Set("Content-Type", "application/json")
+	response := map[string]string{
+		"error": err.Error(),
+	}
+	if err := json.NewEncoder(w).Encode(response); err != nil {
+		fmt.Printf("HandleGetFacts ERROR writing response: %s", err)
+	}
 }