Add artist lookup by genre

diff --git a/main.go b/main.go
index 81803f7..b59a627 100644 (file)
--- a/main.go
+++ b/main.go
@@ -15,15 +15,9 @@ func main() {
                log.Fatal("Could not set up Env: ", err.Error())
        }
 
-       http.HandleFunc(
-               "/artist/",
-               artist.Index(env),
-       )
-
-       http.HandleFunc(
-               "/artist/add",
-               artist.Add(env),
-       )
+       http.HandleFunc("/artist/", artist.Index(env))
+       http.HandleFunc("/artist/genre", artist.ByGenre(env))
+       http.HandleFunc("/artist/add", artist.Add(env))
 
        http.HandleFunc("/genre", genre.Index(env))
 

diff --git a/routes/artist/artist.go b/routes/artist/artist.go
index 09788ad..e6eb320 100644 (file)
--- a/routes/artist/artist.go
+++ b/routes/artist/artist.go
@@ -114,3 +114,46 @@ func Add(env *env.Env) routes.Handler {
                w.WriteHeader(http.StatusCreated)
        }
 }
+
+func ByGenre(env *env.Env) routes.Handler {
+       return func(w http.ResponseWriter, r *http.Request) {
+               if r.Method != "GET" {
+                       http.Error(w, http.StatusText(http.StatusMethodNotAllowed), http.StatusMethodNotAllowed)
+                       return
+               }
+
+               w.Header().Set("Content-Type", "application/json")
+               genreName := r.FormValue("genre_name")
+               if genreName != "" {
+                       rows, err := env.Db.Db.Query("SELECT ID, NAME FROM ARTIST WHERE ID IN (SELECT ARTIST_ID FROM ARTIST_GENRE_XREF WHERE GENRE_ID IN (SELECT ID FROM GENRE WHERE NAME = lower(?))) LIMIT 20", genreName)
+                       if err != nil {
+                               log.Print(err)
+                               http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
+                               return
+                       }
+                       defer rows.Close()
+
+                       artists := make([]types.Artist, 0)
+                       for rows.Next() {
+                               artist := types.Artist{}
+                               if err := rows.Scan(&artist.ID, &artist.Name); err != nil {
+                                       http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
+                                       return
+                               }
+                               artists = append(artists, artist)
+                       }
+                       if err = rows.Err(); err != nil {
+                               log.Print(err)
+                               http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
+                               return
+                       }
+                       b, err := json.Marshal(artists)
+                       if err != nil {
+                               log.Print(err)
+                               http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
+                               return
+                       }
+                       w.Write(b)
+               }
+       }
+}