103 lines
2.2 KiB
Go
103 lines
2.2 KiB
Go
package lastfm
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import (
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"context"
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"encoding/json"
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"fmt"
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"io/ioutil"
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"net/http"
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"net/url"
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"strconv"
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)
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const (
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apiBaseUrl = "https://ws.audioscrobbler.com/2.0/"
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)
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type HttpClient interface {
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Do(req *http.Request) (*http.Response, error)
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}
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func NewClient(apiKey string, lang string, hc HttpClient) *Client {
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return &Client{apiKey, lang, hc}
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}
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type Client struct {
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apiKey string
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lang string
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hc HttpClient
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}
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func (c *Client) makeRequest(params url.Values) (*Response, error) {
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params.Add("format", "json")
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params.Add("api_key", c.apiKey)
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req, _ := http.NewRequest("GET", apiBaseUrl, nil)
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req.URL.RawQuery = params.Encode()
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resp, err := c.hc.Do(req)
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if err != nil {
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return nil, err
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}
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defer resp.Body.Close()
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data, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return nil, err
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}
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if resp.StatusCode != 200 {
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return nil, c.parseError(data)
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}
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var response Response
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err = json.Unmarshal(data, &response)
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return &response, err
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}
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func (c *Client) ArtistGetInfo(ctx context.Context, name string) (*Artist, error) {
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params := url.Values{}
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params.Add("method", "artist.getInfo")
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params.Add("artist", name)
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params.Add("lang", c.lang)
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response, err := c.makeRequest(params)
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if err != nil {
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return nil, err
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}
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return &response.Artist, nil
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}
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func (c *Client) ArtistGetSimilar(ctx context.Context, name string, limit int) ([]Artist, error) {
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params := url.Values{}
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params.Add("method", "artist.getSimilar")
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params.Add("artist", name)
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params.Add("limit", strconv.Itoa(limit))
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response, err := c.makeRequest(params)
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if err != nil {
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return nil, err
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}
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return response.SimilarArtists.Artists, nil
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}
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func (c *Client) ArtistGetTopTracks(ctx context.Context, name string, limit int) ([]Track, error) {
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params := url.Values{}
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params.Add("method", "artist.getTopTracks")
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params.Add("artist", name)
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params.Add("limit", strconv.Itoa(limit))
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response, err := c.makeRequest(params)
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if err != nil {
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return nil, err
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}
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return response.TopTracks.Track, nil
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}
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func (c *Client) parseError(data []byte) error {
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var e Error
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err := json.Unmarshal(data, &e)
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if err != nil {
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return err
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}
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return fmt.Errorf("last.fm error(%d): %s", e.Code, e.Message)
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}
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