Add "real" TopSongs

core/lastfm/client.go

@@ -80,6 +80,18 @@ func (c *Client) ArtistGetSimilar(ctx context.Context, name string, limit int) (
 	return response.SimilarArtists.Artists, nil
 }
 
+func (c *Client) ArtistGetTopTracks(ctx context.Context, name string, limit int) ([]Track, error) {
+	params := url.Values{}
+	params.Add("method", "artist.getTopTracks")
+	params.Add("artist", name)
+	params.Add("limit", strconv.Itoa(limit))
+	response, err := c.makeRequest(params)
+	if err != nil {
+		return nil, err
+	}
+	return response.TopTracks.Track, nil
+}
+
 func (c *Client) parseError(data []byte) error {
 	var e Error
 	err := json.Unmarshal(data, &e)

core/lastfm/client_test.go

@@ -98,7 +98,45 @@ var _ = Describe("Client", func() {
 			_, err := client.ArtistGetSimilar(context.TODO(), "U2", 2)
 			Expect(err).To(MatchError("invalid character '<' looking for beginning of value"))
 		})
+	})
 
+	Describe("ArtistGetTopTracks", func() {
+		It("returns top tracks for a successful response", func() {
+			f, _ := os.Open("tests/fixtures/lastfm.artist.gettoptracks.json")
+			httpClient.res = http.Response{Body: f, StatusCode: 200}
+
+			tracks, err := client.ArtistGetTopTracks(context.TODO(), "U2", 2)
+			Expect(err).To(BeNil())
+			Expect(len(tracks)).To(Equal(2))
+			Expect(httpClient.savedRequest.URL.String()).To(Equal(apiBaseUrl + "?api_key=API_KEY&artist=U2&format=json&limit=2&method=artist.getTopTracks"))
+		})
+
+		It("fails if Last.FM returns an error", func() {
+			httpClient.res = http.Response{
+				Body:       ioutil.NopCloser(bytes.NewBufferString(`{"error":3,"message":"Invalid Method - No method with that name in this package"}`)),
+				StatusCode: 400,
+			}
+
+			_, err := client.ArtistGetTopTracks(context.TODO(), "U2", 2)
+			Expect(err).To(MatchError("last.fm error(3): Invalid Method - No method with that name in this package"))
+		})
+
+		It("fails if HttpClient.Do() returns error", func() {
+			httpClient.err = errors.New("generic error")
+
+			_, err := client.ArtistGetTopTracks(context.TODO(), "U2", 2)
+			Expect(err).To(MatchError("generic error"))
+		})
+
+		It("fails if returned body is not a valid JSON", func() {
+			httpClient.res = http.Response{
+				Body:       ioutil.NopCloser(bytes.NewBufferString(`<xml>NOT_VALID_JSON</xml>`)),
+				StatusCode: 200,
+			}
+
+			_, err := client.ArtistGetTopTracks(context.TODO(), "U2", 2)
+			Expect(err).To(MatchError("invalid character '<' looking for beginning of value"))
+		})
 	})
 })
 

core/lastfm/responses.go

@@ -3,6 +3,7 @@ package lastfm
 type Response struct {
 	Artist         Artist         `json:"artist"`
 	SimilarArtists SimilarArtists `json:"similarartists"`
+	TopTracks      TopTracks      `json:"toptracks"`
 }
 
 type Artist struct {
@@ -42,6 +43,15 @@ type ArtistBio struct {
 	Content   string `json:"content"`
 }
 
+type Track struct {
+	Name string `json:"name"`
+	MBID string `json:"mbid"`
+}
+
+type TopTracks struct {
+	Track []Track `json:"track"`
+}
+
 type Error struct {
 	Code    int    `json:"error"`
 	Message string `json:"message"`

core/lastfm/responses_test.go

@@ -41,6 +41,21 @@ var _ = Describe("LastFM responses", func() {
 		})
 	})
 
+	Describe("TopTracks", func() {
+		It("parses the response correctly", func() {
+			var resp Response
+			body, _ := ioutil.ReadFile("tests/fixtures/lastfm.artist.gettoptracks.json")
+			err := json.Unmarshal(body, &resp)
+			Expect(err).To(BeNil())
+
+			Expect(resp.TopTracks.Track).To(HaveLen(2))
+			Expect(resp.TopTracks.Track[0].Name).To(Equal("Beautiful Day"))
+			Expect(resp.TopTracks.Track[0].MBID).To(Equal("f7f264d0-a89b-4682-9cd7-a4e7c37637af"))
+			Expect(resp.TopTracks.Track[1].Name).To(Equal("With or Without You"))
+			Expect(resp.TopTracks.Track[1].MBID).To(Equal("6b9a509f-6907-4a6e-9345-2f12da09ba4b"))
+		})
+	})
+
 	Describe("Error", func() {
 		It("parses the error response correctly", func() {
 			var error Error