filterAndLimit

Makefile

@@ -0,0 +1,4 @@
+.PHONY: format
+
+format:
+	gofmt -w $$(git ls-files '*.go')

main.go

@@ -42,12 +42,10 @@ func main() {
 		}
 		stopId := query["stop_id"][0]
 
-		/*
+		var platform *string = nil
-			var platform *string = nil
+		if query["platform"] != nil && len(query["platform"]) != 0 {
-			if query["platform"] != nil && len(query["platform"]) != 0 {
+			platform = &query["platform"][0]
-				platform = &query["platform"][0]
+		}
-			}
-		*/
 
 		c := efaClients[(efaClient.Add(1)-1)%uint64(len(efaClients))]
 		departures, err := FetchDepartures(c, stopId)
@@ -57,6 +55,8 @@ func main() {
 		}
 		// TODO: Filter for platform here
 
+		filterAndLimitDepartures(&departures, platform, 8)
+
 		// Does not handle multiple media types
 		if r.Header.Get("Accept") == "application/json" {
 			w.Header().Set("Content-Type", "application/json")
@@ -75,3 +75,21 @@ func main() {
 	})
 	log.Fatal(http.ListenAndServe(":8000", nil))
 }
+
+func filterAndLimitDepartures(departures *Departures, platform *string, limit int) {
+	oldDepartures := departures.Departures
+
+	departures.Departures = []Departure{}
+	for _, departure := range oldDepartures {
+		if len(departures.Departures) >= limit {
+			break
+		}
+
+		isPlatformMatch := platform == nil || departure.Platform == *platform
+		if !isPlatformMatch {
+			continue
+		}
+
+		departures.Departures = append(departures.Departures, departure)
+	}
+}