From b059b01a0b868ecf32350cee5be9954a9e90920c Mon Sep 17 00:00:00 2001
From: Dave Gallant <davegallant@gmail.com>
Date: Sun, 21 Aug 2022 14:47:34 +0000
Subject: [PATCH] Cache topics

---
 backend/app.go | 22 ++++++++++++++--------
 src/App.vue    |  3 ++-
 2 files changed, 16 insertions(+), 9 deletions(-)

diff --git a/backend/app.go b/backend/app.go
index 2be3307..899148d 100644
--- a/backend/app.go
+++ b/backend/app.go
@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"io/ioutil"
 	"net/http"
+	"time"
 
 	_ "github.com/joho/godotenv/autoload"
 	"github.com/rs/zerolog/log"
@@ -31,6 +32,7 @@ type App struct {
 	Router        *mux.Router
 	BasePath      string
 	CurrentTopics []Topic
+	LastRefresh   time.Time
 }
 
 func (a *App) Initialize() {
@@ -53,9 +55,9 @@ func (a *App) initializeRoutes() {
 	a.Router.HandleFunc("/topics", a.listTopics).Methods("GET")
 }
 
-func respondWithError(w http.ResponseWriter, code int, message string) {
-	respondWithJSON(w, code, map[string]string{"error": message})
-}
+// func respondWithError(w http.ResponseWriter, code int, message string) {
+// 	respondWithJSON(w, code, map[string]string{"error": message})
+// }
 
 func respondWithJSON(w http.ResponseWriter, code int, payload interface{}) {
 	response, _ := json.Marshal(payload)
@@ -72,16 +74,20 @@ func respondWithJSON(w http.ResponseWriter, code int, payload interface{}) {
 // @Router       /topics [get]
 // @Success 200 {array} Topic
 func (a *App) listTopics(w http.ResponseWriter, r *http.Request) {
-	var topics []Topic
-	a.refreshDeals()
-	respondWithJSON(w, http.StatusOK, topics)
+	if time.Since(a.LastRefresh).Minutes() > 1 {
+		a.refreshTopics()
+	} else {
+		log.Debug().Msg("Topics cache has not expired. Using existing.")
+	}
+	respondWithJSON(w, http.StatusOK, a.CurrentTopics)
 }
 
-func (a *App) refreshDeals() {
+func (a *App) refreshTopics() {
 	latestTopics := a.getDeals(9, 1, 4)
 	// TODO: only drop deals if a timer has been met
-	log.Debug().Msg("Refreshing deals")
+	log.Debug().Msg("Refreshing topics")
 	a.CurrentTopics = latestTopics
+	a.LastRefresh = time.Now()
 }
 
 func (a *App) getDeals(id int, firstPage int, lastPage int) []Topic {
diff --git a/src/App.vue b/src/App.vue
index 7d51d77..259a7a7 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -12,7 +12,8 @@
         <tr>
           <th scope="col">Deal</th>
           <th scope="col">Views</th>
-          <th scope="col">Score</th>
+          <!-- TODO:score  -->
+          <!-- <th scope="col">Score</th> -->
           <th scope="col">Last Post</th>
         </tr>
       </thead>