add api route for querying summaries

Co-authored-by: MMatthew14 <matthewlorenz@protonmail.com>
Reviewed-on: https://github.com/kennethnym/7am/pull/3

main.go

@@ -122,6 +122,9 @@ var supportedLocations = map[string]*location{
 	"la":        {nil, 34.052235, -118.243683, "America/Los_Angeles", "Los Angeles"},
 	"nyc":       {nil, 40.712776, -74.005974, "America/New_York", "New York City"},
 	"tokyo":     {nil, 35.689487, 139.691711, "Asia/Tokyo", "Tokyo"},
+	"singapore": {nil, 1.290270, 103.851959, "Asia/Singapore", "Singapore"},
+	"manila":    {nil, 14.599512, 120.984222, "Asia/Manila", "Manila"},
+	"hk":        {nil, 22.317053, 114.169547, "Asia/Hong_Kong", "Hong Kong"},
 	"warsaw":    {nil, 52.229675, 21.012230, "Europe/Warsaw", "Warsaw"},
 	"zurich":    {nil, 47.369019, 8.538030, "Europe/Zurich", "Zurich"},
 	"berlin":    {nil, 52.520008, 13.404954, "Europe/Berlin", "Berlin"},
@@ -394,6 +397,39 @@ func handleHTTPRequest(state *state) http.HandlerFunc {
 				writer.WriteHeader(http.StatusMethodNotAllowed)
 			}
 
+		} else if strings.HasPrefix(path, "api/") {
+			if origin := request.Header.Get("Origin"); origin != "" {
+				writer.Header().Set("Access-Control-Allow-Origin", origin)
+			}
+
+			if strings.HasPrefix(path, "api/summary/") {
+				switch request.Method {
+				case "OPTIONS":
+					writer.Header().Set("Access-Control-Allow-Methods", "GET, OPTIONS")
+					writer.WriteHeader(http.StatusOK)
+
+				case "GET":
+					location := strings.TrimPrefix(path, "api/summary/")
+					summary, ok := state.summaries.Load(location)
+					if !ok {
+						writer.WriteHeader(http.StatusNotFound)
+						return
+					}
+
+					response := map[string]string{
+						"summary": strings.TrimSpace(summary.(string)),
+					}
+
+					writer.Header().Set("Content-Type", "application/json")
+
+					json.NewEncoder(writer).Encode(response)
+
+				default:
+					writer.WriteHeader(http.StatusMethodNotAllowed)
+				}
+			} else {
+				writer.WriteHeader(http.StatusNotFound)
+			}
 		} else {
 			if request.Method != "" && request.Method != "GET" {
 				writer.WriteHeader(http.StatusMethodNotAllowed)
@@ -703,10 +739,12 @@ func updateSummary(ctx context.Context, state *state, opts updateSummaryOptions)
 
 	summary := result.Text()
 
-	_, err = state.db.ExecContext(ctx, "INSERT INTO summaries (location, summary) VALUES (?, ?)", locKey, summary)
+	state.dbMutex.Lock()
+	_, err = state.db.ExecContext(ctx, "INSERT OR REPLACE INTO summaries (location, summary) VALUES (?, ?)", locKey, summary)
 	if err != nil {
 		slog.Warn("unable to cache generated weather summary to db", "location", locKey, "error", err)
 	}
+	state.dbMutex.Unlock()
 
 	state.summaries.Store(locKey, summary)
 

web/index.html

@@ -53,6 +53,9 @@
                 <li><a href="/warsaw">Warsaw</a></li>
                 <li><a href="/dubai">Dubai</a></li>
                 <li><a href="/tokyo">Tokyo</a></li>
+                <li><a href="/singapore">Singapore</a></li>
+                <li><a href="/manila">Manila</a></li>
+                <li><a href="/hk">Hong Kong</a></li>
             </ul>
         </main>