Minor improvements

.travis.yml

@@ -1,3 +1,3 @@
 language: go
 go:
-  - "1.10"
+  - "1.14"

README.md

@@ -4,6 +4,8 @@
 
 go-discogs is a Go client library for the [Discogs API](https://www.discogs.com/developers/). Check the usage section to see how to access the Discogs API.
 
+The lib is under MIT but be sure you are familiar with [Discogs API Terms of Use](https://support.discogs.com/hc/en-us/articles/360009334593-API-Terms-of-Use).
+
 ### Feauteres
  * Database
   * [Releases](#releases)
@@ -31,10 +33,11 @@ import "github.com/irlndts/go-discogs"
 Some requests require authentification (as any user). According to [Discogs](https://www.discogs.com/developers/#page:authentication,header:authentication-discogs-auth-flow), to send requests with Discogs Auth, you have two options: sending your credentials in the query string with key and secret parameters or a [token parameter](https://www.discogs.com/settings/developers).
 This is token way example:
 ```go
-client, err := discogs.NewClient(&discogs.Options{
+client, err := discogs.New(&discogs.Options{
         UserAgent: "Some Name",
         Currency:  "EUR", // optional, "USD" (default), "GBP", "EUR", "CAD", "AUD", "JPY", "CHF", "MXN", "BRL", "NZD", "SEK", "ZAR" are allowed
         Token:     "Some Token", // optional
+        URL:       "https://api.discogs.com", // optional
     })
 ``` 
 
@@ -79,11 +82,9 @@ type SearchRequest struct {
 Example
 ```go
   request := discogs.SearchRequest{Artist: "reggaenauts", ReleaseTitle: "river rock", Page: 0, PerPage: 1}
-  search, _ := client.Search(request)
+  search, _ := client.Search.Search(request)
 
   for _, r := range search.Results {
     fmt.Println(r.Title)
   }
 ```
-
-etc. 

database.go

@@ -30,6 +30,7 @@ type Release struct {
 	Title             string         `json:"title"`
 	ID                int            `json:"id"`
 	Artists           []ArtistSource `json:"artists"`
+	ArtistsSort       string         `json:"artists_sort"`
 	DataQuality       string         `json:"data_quality"`
 	Thumb             string         `json:"thumb"`
 	Community         Community      `json:"community"`
@@ -53,7 +54,7 @@ type Release struct {
 	Released          string         `json:"released"`
 	ReleasedFormatted string         `json:"released_formatted"`
 	ResourceURL       string         `json:"resource_url"`
-	// Series
+	Series            []Series       `json:"series"`
 	Status            string         `json:"status"`
 	Styles            []string       `json:"styles"`
 	Tracklist         []Track        `json:"tracklist"`
@@ -68,11 +69,8 @@ func (s *DatabaseService) Release(releaseID int) (*Release, error) {
 	params.Set("curr_abbr", s.currency)
 
 	var release *Release
-	if err := request(s.url+releasesURI+strconv.Itoa(releaseID), params, &release); err != nil {
+	err := request(s.url+releasesURI+strconv.Itoa(releaseID), params, &release)
-		return nil, err
+	return release, err
-	}
-
-	return release, nil
 }
 
 // ReleaseRating serves response for community release rating request
@@ -84,34 +82,34 @@ type ReleaseRating struct {
 // ReleaseRating retruns community release rating
 func (s *DatabaseService) ReleaseRating(releaseID int) (*ReleaseRating, error) {
 	var rating *ReleaseRating
-	if err := request(s.url+releasesURI+strconv.Itoa(releaseID)+"/rating", nil, &rating); err != nil {
+	err := request(s.url+releasesURI+strconv.Itoa(releaseID)+"/rating", nil, &rating)
-		return nil, err
+	return rating, err
-	}
-
-	return rating, nil
 }
 
-// Artist ...
+// Artist resource represents a person in the Discogs database
+// who contributed to a Release in some capacity.
+// More information https://www.discogs.com/developers#page:database,header:database-artist
 type Artist struct {
+	ID             int      `json:"id"`
+	Name           string   `json:"name"`
+	Realname       string   `json:"realname"`
+	Members        []Member `json:"members,omitempty"`
+	Aliases        []Alias  `json:"aliases,omitempty"`
 	Namevariations []string `json:"namevariations"`
+	Images         []Image  `json:"images"`
 	Profile        string   `json:"profile"`
 	ReleasesURL    string   `json:"releases_url"`
 	ResourceURL    string   `json:"resource_url"`
 	URI            string   `json:"uri"`
 	URLs           []string `json:"urls"`
 	DataQuality    string   `json:"data_quality"`
-	ID             int      `json:"id"`
-	Images         []Image  `json:"images"`
-	Members        []Member `json:"members"`
 }
 
 // Artist represents a person in the discogs database
 func (s *DatabaseService) Artist(artistID int) (*Artist, error) {
 	var artist *Artist
-	if err := request(s.url+artistsURI+strconv.Itoa(artistID), nil, &artist); err != nil {
+	err := request(s.url+artistsURI+strconv.Itoa(artistID), nil, &artist)
-		return nil, err
+	return artist, err
-	}
-	return artist, nil
 }
 
 // ArtistReleases ...
@@ -123,10 +121,8 @@ type ArtistReleases struct {
 // ArtistReleases returns a list of releases and masters associated with the artist.
 func (s *DatabaseService) ArtistReleases(artistID int, pagination *Pagination) (*ArtistReleases, error) {
 	var releases *ArtistReleases
-	if err := request(s.url+artistsURI+strconv.Itoa(artistID)+"/releases", pagination.toParams(), &releases); err != nil {
+	err := request(s.url+artistsURI+strconv.Itoa(artistID)+"/releases", pagination.params(), &releases)
-		return nil, err
+	return releases, err
-	}
-	return releases, nil
 }
 
 // Label resource represents a label, company, recording studio, location,
@@ -148,10 +144,8 @@ type Label struct {
 // Label returns a label.
 func (s *DatabaseService) Label(labelID int) (*Label, error) {
 	var label *Label
-	if err := request(s.url+labelsURI+strconv.Itoa(labelID), nil, &label); err != nil {
+	err := request(s.url+labelsURI+strconv.Itoa(labelID), nil, &label)
-		return nil, err
+	return label, err
-	}
-	return label, nil
 }
 
 // LabelReleases is a list of Releases associated with the label.
@@ -163,39 +157,41 @@ type LabelReleases struct {
 // LabelReleases returns a list of Releases associated with the label.
 func (s *DatabaseService) LabelReleases(labelID int, pagination *Pagination) (*LabelReleases, error) {
 	var releases *LabelReleases
-	if err := request(s.url+labelsURI+strconv.Itoa(labelID)+"/releases", pagination.toParams(), &releases); err != nil {
+	err := request(s.url+labelsURI+strconv.Itoa(labelID)+"/releases", pagination.params(), &releases)
-		return nil, err
+	return releases, err
-	}
-	return releases, nil
 }
 
 // Master resource represents a set of similar releases.
 // Masters (also known as `master releases`) have a `main release` which is often the chronologically earliest.
+// More information https://www.discogs.com/developers#page:database,header:database-master-release
 type Master struct {
+	ID                   int            `json:"id"`
 	Styles               []string       `json:"styles"`
 	Genres               []string       `json:"genres"`
-	Videos         []Video  `json:"videos"`
 	Title                string         `json:"title"`
+	Year                 int            `json:"year"`
+	Tracklist            []Track        `json:"tracklist"`
+	Notes                string         `json:"notes"`
+	Artists              []ArtistSource `json:"artists"`
+	Images               []Image        `json:"images"`
+	Videos               []Video        `json:"videos"`
+	NumForSale           int            `json:"num_for_sale"`
+	LowestPrice          float64        `json:"lowest_price"`
+	URI                  string         `json:"uri"`
 	MainRelease          int            `json:"main_release"`
 	MainReleaseURL       string         `json:"main_release_url"`
-	URI            string   `json:"uri"`
+	MostRecentRelease    int            `json:"most_recent_release"`
-	Artists        []Artist `json:"artists"`
+	MostRecentReleaseURL string         `json:"most_recent_release_url"`
-	VersionURL     string   `json:"version_url"`
+	VersionsURL          string         `json:"versions_url"`
-	Year           int      `json:"year"`
-	Images         []Image  `json:"images"`
 	ResourceURL          string         `json:"resource_url"`
-	Tracklist      []Track  `json:"tracklist"`
-	ID             int      `json:"id"`
 	DataQuality          string         `json:"data_quality"`
 }
 
 // Master returns a master release
 func (s *DatabaseService) Master(masterID int) (*Master, error) {
 	var master *Master
-	if err := request(s.url+mastersURI+strconv.Itoa(masterID), nil, &master); err != nil {
+	err := request(s.url+mastersURI+strconv.Itoa(masterID), nil, &master)
-		return nil, err
+	return master, err
-	}
-	return master, nil
 }
 
 // MasterVersions retrieves a list of all releases that are versions of this master.
@@ -207,8 +203,6 @@ type MasterVersions struct {
 // MasterVersions retrieves a list of all Releases that are versions of this master
 func (s *DatabaseService) MasterVersions(masterID int, pagination *Pagination) (*MasterVersions, error) {
 	var versions *MasterVersions
-	if err := request(s.url+mastersURI+strconv.Itoa(masterID)+"/versions", pagination.toParams(), &versions); err != nil {
+	err := request(s.url+mastersURI+strconv.Itoa(masterID)+"/versions", pagination.params(), &versions)
-		return nil, err
+	return versions, err
-	}
-	return versions, nil
 }

database_test.go

@@ -1,21 +1,62 @@
 package discogs
 
 import (
+	"encoding/json"
 	"io"
+	"log"
 	"net/http"
 	"net/http/httptest"
 	"testing"
+
+	"github.com/google/go-cmp/cmp"
 )
 
-func ReleaseServer(w http.ResponseWriter, r *http.Request) {
+func DatabaseServer(w http.ResponseWriter, r *http.Request) {
+	if r.Method != "GET" {
+		w.WriteHeader(http.StatusMethodNotAllowed)
+		return
+	}
+
+	switch r.URL.Path {
+	case "/releases/8138518":
 		w.WriteHeader(http.StatusOK)
-	io.WriteString(w, `{"title":"Elephant Riddim"}`)
+		if _, err := io.WriteString(w, releaseJson); err != nil {
+			w.WriteHeader(http.StatusInternalServerError)
+			return
+		}
+	case "/masters/718441":
+		w.WriteHeader(http.StatusOK)
+		if _, err := io.WriteString(w, masterJson); err != nil {
+			w.WriteHeader(http.StatusInternalServerError)
+			return
+		}
+	case "/artists/38661":
+		w.WriteHeader(http.StatusOK)
+		if _, err := io.WriteString(w, artistJson); err != nil {
+			w.WriteHeader(http.StatusInternalServerError)
+			return
+		}
+	default:
+		w.WriteHeader(http.StatusMethodNotAllowed)
+	}
 }
 
-func TestReleaseServiceRelease(t *testing.T) {
+func compareJson(t *testing.T, got, want string) {
-	expectedTitle := "Elephant Riddim"
+	var g, w interface{}
+	if err := json.Unmarshal([]byte(got), &g); err != nil {
+		log.Fatalf("failed to unmarshal json: %s", err)
+	}
+	if err := json.Unmarshal([]byte(want), &w); err != nil {
+		log.Fatalf("failed to unmarshal json: %s", err)
+	}
 
-	ts := httptest.NewServer(http.HandlerFunc(ReleaseServer))
+	if diff := cmp.Diff(g, w); diff != "" {
+		t.Errorf("(-want +got)\n%s", diff)
+	}
+}
+
+func TestDatabaseServiceRelease(t *testing.T) {
+	ts := httptest.NewServer(http.HandlerFunc(DatabaseServer))
 	defer ts.Close()
 
 	d := initDiscogsClient(t, &Options{URL: ts.URL})
@@ -24,7 +65,44 @@ func TestReleaseServiceRelease(t *testing.T) {
 		t.Fatalf("failed to get release: %s", err)
 	}
 
-	if release.Title != expectedTitle {
+	json, err := json.Marshal(release)
-		t.Fatalf("release title got=%s want=%s ", expectedTitle, release.Title)
+	if err != nil {
+		t.Fatalf("failed to marshal release: %s", err)
 	}
+
+	compareJson(t, string(json), releaseJson)
+}
+
+func TestDatabaseServiceMaster(t *testing.T) {
+	ts := httptest.NewServer(http.HandlerFunc(DatabaseServer))
+	defer ts.Close()
+
+	d := initDiscogsClient(t, &Options{URL: ts.URL})
+	master, err := d.Database.Master(718441)
+	if err != nil {
+		t.Fatalf("failed to get master: %s", err)
+	}
+
+	json, err := json.Marshal(master)
+	if err != nil {
+		t.Fatalf("failed to marshal release: %s", err)
+	}
+	compareJson(t, string(json), masterJson)
+}
+
+func TestDatabaseServiceArtist(t *testing.T) {
+	ts := httptest.NewServer(http.HandlerFunc(DatabaseServer))
+	defer ts.Close()
+
+	d := initDiscogsClient(t, &Options{URL: ts.URL})
+	artist, err := d.Database.Artist(38661)
+	if err != nil {
+		t.Fatalf("failed to get master: %s", err)
+	}
+
+	json, err := json.Marshal(artist)
+	if err != nil {
+		t.Fatalf("failed to marshal artist: %s", err)
+	}
+	compareJson(t, string(json), artistJson)
 }

discogs.go

@@ -2,6 +2,7 @@ package discogs
 
 import (
 	"encoding/json"
+	"fmt"
 	"io/ioutil"
 	"net/http"
 	"net/url"
@@ -13,22 +14,26 @@ const (
 
 // Options is a set of options to use discogs API client
 type Options struct {
+	// Discogs API endpoint (optional).
 	URL string
+	// Currency to use (optional, default is USD).
 	Currency string
+	// UserAgent to to call discogs api with.
 	UserAgent string
+	// Token provided by discogs (optional).
 	Token string
 }
 
-// Client is a Discogs client for making Discogs API requests.
+// Discogs is a Discogs' client for making Discogs API requests.
-type Client struct {
+type Discogs struct {
 	Database *DatabaseService
 	Search   *SearchService
 }
 
 var header *http.Header
 
-// NewClient returns a new Client.
+// New returns a new discogs API client.
-func NewClient(o *Options) (*Client, error) {
+func New(o *Options) (*Discogs, error) {
 	header = &http.Header{}
 
 	if o == nil || o.UserAgent == "" {
@@ -51,7 +56,7 @@ func NewClient(o *Options) (*Client, error) {
 		o.URL = discogsAPI
 	}
 
-	return &Client{
+	return &Discogs{
 		Database: newDatabaseService(o.URL, cur),
 		Search:   newSearchService(o.URL + "/database/search"),
 	}, nil
@@ -85,6 +90,15 @@ func request(path string, params url.Values, resp interface{}) error {
 	}
 	defer response.Body.Close()
 
+	if response.StatusCode != http.StatusOK {
+		switch response.StatusCode {
+		case http.StatusUnauthorized:
+			return ErrUnauthorized
+		default:
+			return fmt.Errorf("unknown error: %s", response.Status)
+		}
+	}
+
 	body, err := ioutil.ReadAll(response.Body)
 	if err != nil {
 		return err

discogs_test.go

@@ -9,7 +9,7 @@ const (
 	testToken     = ""
 )
 
-func initDiscogsClient(t *testing.T, options *Options) *Client {
+func initDiscogsClient(t *testing.T, options *Options) *Discogs {
 	if options == nil {
 		options = &Options{
 			UserAgent: testUserAgent,
@@ -22,7 +22,7 @@ func initDiscogsClient(t *testing.T, options *Options) *Client {
 		options.UserAgent = testUserAgent
 	}
 
-	client, err := NewClient(options)
+	client, err := New(options)
 	if err != nil {
 		t.Fatalf("failed to create client: %s", err)
 	}
@@ -30,7 +30,7 @@ func initDiscogsClient(t *testing.T, options *Options) *Client {
 	return client
 }
 
-func TestNewClient(t *testing.T) {
+func TestNew(t *testing.T) {
 	tests := map[string]struct {
 		options *Options
 		err     error
@@ -50,9 +50,10 @@ func TestNewClient(t *testing.T) {
 		}, ErrCurrencyNotSupported},
 	}
 
-	for name, tt := range tests {
+	for name := range tests {
+		tt := tests[name]
 		t.Run(name, func(t *testing.T) {
-			if _, err := NewClient(tt.options); err != tt.err {
+			if _, err := New(tt.options); err != tt.err {
 				t.Errorf("err got=%s; want=%s", err, tt.err)
 			}
 		})

errors.go

@@ -16,6 +16,7 @@ func (e *Error) Error() string {
 
 // APIErrors
 var (
+	ErrUnauthorized         = &Error{"authentication required"}
 	ErrCurrencyNotSupported = &Error{"currency does not supported"}
 	ErrUserAgentInvalid     = &Error{"invalid user-agent"}
 )

examples/discogs_example.go

@@ -7,9 +7,9 @@ import (
 )
 
 func main() {
-	d, err := discogs.NewClient(&discogs.Options{
+	d, err := discogs.New(&discogs.Options{
 		UserAgent: "TestDiscogsClient/0.0.1 +http://example.com",
-		Currency:  "AAA",
+		Currency:  "USD",
 		Token:     "",
 	})
 	if err != nil {
@@ -17,10 +17,10 @@ func main() {
 		return
 	}
 
-	release, err := d.Database.Release(12345)
+	master, err := d.Database.Master(718441)
 	if err != nil {
 		fmt.Println(err)
 		return
 	}
-	fmt.Printf("%+v\n", release)
+	fmt.Printf("%+v\n", master)
 }

go.mod

@@ -1,3 +1,5 @@
 module github.com/irlndts/go-discogs
 
-require github.com/google/go-querystring v0.0.0-20170111101155-53e6ce116135
+go 1.14
+
+require github.com/google/go-cmp v0.4.0

go.sum

@@ -1,2 +1,4 @@
-github.com/google/go-querystring v0.0.0-20170111101155-53e6ce116135 h1:zLTLjkaOFEFIOxY5BWLFLwh+cL8vOBW4XJ2aqLE/Tf0=
+github.com/google/go-cmp v0.4.0 h1:xsAVV57WRhGj6kEIi8ReJzQlHHqcBYCElAvkovg3B/4=
-github.com/google/go-querystring v0.0.0-20170111101155-53e6ce116135/go.mod h1:odCYkC5MyYFN7vkCjXpyrEuKhc/BUO6wN/zVPAxq5ck=
+github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=

models.go

@@ -14,6 +14,17 @@ type Video struct {
 	URI         string `json:"uri"`
 }
 
+// Series ...
+type Series struct {
+	Catno          string `json:"catno"`
+	EntityType     string `json:"entity_type"`
+	EntityTypeName string `json:"entity_type_name"`
+	ID             int    `json:"id"`
+	Name           string `json:"name"`
+	ResourceURL    string `json:"resource_url"`
+	ThumbnailURL   string `json:"thumbnail_url,omitempty"`
+}
+
 // ArtistSource ...
 type ArtistSource struct {
 	Anv         string `json:"anv"`
@@ -41,14 +52,15 @@ type Track struct {
 	Position     string         `json:"position"`
 	Title        string         `json:"title"`
 	Type         string         `json:"type_"`
-	Extraartists []ArtistSource `json:"extraartists"`
+	Extraartists []ArtistSource `json:"extraartists,omitempty"`
-	Artists      []ArtistSource `json:"artists"`
+	Artists      []ArtistSource `json:"artists,omitempty"`
 }
 
 // LabelSource ...
 type LabelSource struct {
 	Catno          string `json:"catno"`
 	EntityType     string `json:"entity_type"`
+	EntityTypeName string `json:"entity_type_name"`
 	ID             int    `json:"id"`
 	Name           string `json:"name"`
 	ResourceURL    string `json:"resource_url"`
@@ -56,6 +68,7 @@ type LabelSource struct {
 
 // Identifier ...
 type Identifier struct {
+	Description string `json:"description,omitempty"`
 	Type        string `json:"type"`
 	Value       string `json:"value"`
 }
@@ -80,7 +93,7 @@ type Company struct {
 // Community ...
 type Community struct {
 	Contributors []Contributor `json:"contributors"`
-	DataQuality  string        `json:"string"`
+	DataQuality  string        `json:"data_quality"`
 	Have         int           `json:"have"`
 	Rating       Rating        `json:"rating"`
 	Status       string        `json:"status"`
@@ -143,6 +156,13 @@ type Member struct {
 	ResourceURL string `json:"resource_url"`
 }
 
+// Alias ...
+type Alias struct {
+	ID          int    `json:"id"`
+	Name        string `json:"name"`
+	ResourceURL string `json:"resource_url"`
+}
+
 // Sublable ...
 type Sublable struct {
 	ResourceURL string `json:"url"`
@@ -175,23 +195,15 @@ type Pagination struct {
 }
 
 // toParams converts pagaination params to request values
-func (p *Pagination) toParams() url.Values {
+func (p *Pagination) params() url.Values {
 	if p == nil {
 		return nil
 	}
 
 	params := url.Values{}
-	if p.Sort != "" {
 	params.Set("sort", p.Sort)
-	}
-	if p.SortOrder != "" {
 	params.Set("sort_order", p.SortOrder)
-	}
-	if p.Page != 0 {
 	params.Set("page", strconv.Itoa(p.Page))
-	}
-	if p.PerPage != 0 {
 	params.Set("per_page", strconv.Itoa(p.PerPage))
-	}
 	return params
 }

search.go

@@ -1,7 +1,8 @@
 package discogs
 
 import (
-	"github.com/google/go-querystring/query"
+	"net/url"
+	"strconv"
 )
 
 // SearchService ...
@@ -17,27 +18,96 @@ func newSearchService(url string) *SearchService {
 
 // SearchRequest describes search request
 type SearchRequest struct {
-	Q            string `url:"q,omitempty"`             // search query
+	Q            string // search query
-	Type         string `url:"type,omitempty"`          // one of release, master, artist, label
+	Type         string // one of release, master, artist, label
-	Title        string `url:"title,omitempty"`         // search by combined “Artist Name - Release Title” title field
+	Title        string // search by combined “Artist Name - Release Title” title field
-	ReleaseTitle string `url:"release_title,omitempty"` // search release titles
+	ReleaseTitle string // search release titles
-	Credit       string `url:"credit,omitempty"`        // search release credits
+	Credit       string // search release credits
-	Artist       string `url:"artist,omitempty"`        // search artist names
+	Artist       string // search artist names
-	Anv          string `url:"anv,omitempty"`           // search artist ANV
+	Anv          string // search artist ANV
-	Label        string `url:"label,omitempty"`         // search label names
+	Label        string // search label names
-	Genre        string `url:"genre,omitempty"`         // search genres
+	Genre        string // search genres
-	Style        string `url:"style,omitempty"`         // search styles
+	Style        string // search styles
-	Country      string `url:"country,omitempty"`       // search release country
+	Country      string // search release country
-	Year         string `url:"year,omitempty"`          // search release year
+	Year         string // search release year
-	Format       string `url:"format,omitempty"`        // search formats
+	Format       string // search formats
-	Catno        string `url:"catno,omitempty"`         // search catalog number
+	Catno        string // search catalog number
-	Barcode      string `url:"barcode,omitempty"`       // search barcodes
+	Barcode      string // search barcodes
-	Track        string `url:"track,omitempty"`         // search track titles
+	Track        string // search track titles
-	Submitter    string `url:"submitter,omitempty"`     // search submitter username
+	Submitter    string // search submitter username
-	Contributor  string `url:"contributor,omitempty"`   // search contributor usernames
+	Contributor  string // search contributor usernames
 
-	Page    int `url:"page,omitempty"`
+	Page    int
-	PerPage int `url:"per_page,omitempty"`
+	PerPage int
+}
+
+func (r *SearchRequest) params() url.Values {
+	if r == nil {
+		return nil
+	}
+
+	params := url.Values{}
+
+	if r.Q != "" {
+		params.Set("q", r.Q)
+	}
+	if r.Type != "" {
+		params.Set("type", r.Type)
+	}
+	if r.Title != "" {
+		params.Set("title", r.Title)
+	}
+	if r.ReleaseTitle != "" {
+		params.Set("release_title", r.ReleaseTitle)
+	}
+	if r.Credit != "" {
+		params.Set("credit", r.Credit)
+	}
+	if r.Artist != "" {
+		params.Set("artist", r.Artist)
+	}
+	if r.Anv != "" {
+		params.Set("anv", r.Anv)
+	}
+	if r.Label != "" {
+		params.Set("label", r.Label)
+	}
+	if r.Genre != "" {
+		params.Set("genre", r.Genre)
+	}
+	if r.Style != "" {
+		params.Set("style", r.Style)
+	}
+	if r.Country != "" {
+		params.Set("country", r.Country)
+	}
+	if r.Year != "" {
+		params.Set("year", r.Year)
+	}
+	if r.Format != "" {
+		params.Set("format", r.Format)
+	}
+	if r.Catno != "" {
+		params.Set("catno", r.Catno)
+	}
+	if r.Barcode != "" {
+		params.Set("barcode", r.Barcode)
+	}
+	if r.Track != "" {
+		params.Set("track", r.Track)
+	}
+	if r.Submitter != "" {
+		params.Set("submitter", r.Submitter)
+	}
+	if r.Contributor != "" {
+		params.Set("contributor", r.Contributor)
+	}
+
+	params.Set("page", strconv.Itoa(r.Page))
+	if r.PerPage != 0 {
+		params.Set("per_page", strconv.Itoa(r.PerPage))
+	}
+	return params
 }
 
 // Search describes search response
@@ -50,6 +120,7 @@ type Search struct {
 type Result struct {
 	Style       []string  `json:"style,omitempty"`
 	Thumb       string    `json:"thumb,omitempty"`
+	CoverImage  string    `json:"cover_image,omitempty"`
 	Title       string    `json:"title,omitempty"`
 	Country     string    `json:"country,omitempty"`
 	Format      []string  `json:"format,omitempty"`
@@ -62,22 +133,15 @@ type Result struct {
 	ResourceURL string    `json:"resource_url,omitempty"`
 	Type        string    `json:"type,omitempty"`
 	ID          int       `json:"id,omitempty"`
+	MasterID    int       `json:"master_id,omitempty"`
 }
 
 // Search makes search request to discogs.
 // Issue a search query to our database. This endpoint accepts pagination parameters.
 // Authentication (as any user) is required.
 // https://www.discogs.com/developers/#page:database,header:database-search
-// TODO(irlndts): improve params to pass
 func (s *SearchService) Search(req SearchRequest) (*Search, error) {
-	params, err := query.Values(req)
-	if err != nil {
-		return nil, err
-	}
-
 	var search *Search
-	if err := request(s.url, params, &search); err != nil {
+	err := request(s.url, req.params(), &search)
-		return nil, err
+	return search, err
-	}
-	return search, nil
 }

vendor/github.com/google/go-querystring/LICENSE

@@ -1,27 +0,0 @@
-Copyright (c) 2013 Google. All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are
-met:
-
-   * Redistributions of source code must retain the above copyright
-notice, this list of conditions and the following disclaimer.
-   * Redistributions in binary form must reproduce the above
-copyright notice, this list of conditions and the following disclaimer
-in the documentation and/or other materials provided with the
-distribution.
-   * Neither the name of Google Inc. nor the names of its
-contributors may be used to endorse or promote products derived from
-this software without specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

vendor/github.com/google/go-querystring/query/encode.go

@@ -1,320 +0,0 @@
-// Copyright 2013 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// Package query implements encoding of structs into URL query parameters.
-//
-// As a simple example:
-//
-// 	type Options struct {
-// 		Query   string `url:"q"`
-// 		ShowAll bool   `url:"all"`
-// 		Page    int    `url:"page"`
-// 	}
-//
-// 	opt := Options{ "foo", true, 2 }
-// 	v, _ := query.Values(opt)
-// 	fmt.Print(v.Encode()) // will output: "q=foo&all=true&page=2"
-//
-// The exact mapping between Go values and url.Values is described in the
-// documentation for the Values() function.
-package query
-
-import (
-	"bytes"
-	"fmt"
-	"net/url"
-	"reflect"
-	"strconv"
-	"strings"
-	"time"
-)
-
-var timeType = reflect.TypeOf(time.Time{})
-
-var encoderType = reflect.TypeOf(new(Encoder)).Elem()
-
-// Encoder is an interface implemented by any type that wishes to encode
-// itself into URL values in a non-standard way.
-type Encoder interface {
-	EncodeValues(key string, v *url.Values) error
-}
-
-// Values returns the url.Values encoding of v.
-//
-// Values expects to be passed a struct, and traverses it recursively using the
-// following encoding rules.
-//
-// Each exported struct field is encoded as a URL parameter unless
-//
-//	- the field's tag is "-", or
-//	- the field is empty and its tag specifies the "omitempty" option
-//
-// The empty values are false, 0, any nil pointer or interface value, any array
-// slice, map, or string of length zero, and any time.Time that returns true
-// for IsZero().
-//
-// The URL parameter name defaults to the struct field name but can be
-// specified in the struct field's tag value.  The "url" key in the struct
-// field's tag value is the key name, followed by an optional comma and
-// options.  For example:
-//
-// 	// Field is ignored by this package.
-// 	Field int `url:"-"`
-//
-// 	// Field appears as URL parameter "myName".
-// 	Field int `url:"myName"`
-//
-// 	// Field appears as URL parameter "myName" and the field is omitted if
-// 	// its value is empty
-// 	Field int `url:"myName,omitempty"`
-//
-// 	// Field appears as URL parameter "Field" (the default), but the field
-// 	// is skipped if empty.  Note the leading comma.
-// 	Field int `url:",omitempty"`
-//
-// For encoding individual field values, the following type-dependent rules
-// apply:
-//
-// Boolean values default to encoding as the strings "true" or "false".
-// Including the "int" option signals that the field should be encoded as the
-// strings "1" or "0".
-//
-// time.Time values default to encoding as RFC3339 timestamps.  Including the
-// "unix" option signals that the field should be encoded as a Unix time (see
-// time.Unix())
-//
-// Slice and Array values default to encoding as multiple URL values of the
-// same name.  Including the "comma" option signals that the field should be
-// encoded as a single comma-delimited value.  Including the "space" option
-// similarly encodes the value as a single space-delimited string. Including
-// the "semicolon" option will encode the value as a semicolon-delimited string.
-// Including the "brackets" option signals that the multiple URL values should
-// have "[]" appended to the value name. "numbered" will append a number to
-// the end of each incidence of the value name, example:
-// name0=value0&name1=value1, etc.
-//
-// Anonymous struct fields are usually encoded as if their inner exported
-// fields were fields in the outer struct, subject to the standard Go
-// visibility rules.  An anonymous struct field with a name given in its URL
-// tag is treated as having that name, rather than being anonymous.
-//
-// Non-nil pointer values are encoded as the value pointed to.
-//
-// Nested structs are encoded including parent fields in value names for
-// scoping. e.g:
-//
-// 	"user[name]=acme&user[addr][postcode]=1234&user[addr][city]=SFO"
-//
-// All other values are encoded using their default string representation.
-//
-// Multiple fields that encode to the same URL parameter name will be included
-// as multiple URL values of the same name.
-func Values(v interface{}) (url.Values, error) {
-	values := make(url.Values)
-	val := reflect.ValueOf(v)
-	for val.Kind() == reflect.Ptr {
-		if val.IsNil() {
-			return values, nil
-		}
-		val = val.Elem()
-	}
-
-	if v == nil {
-		return values, nil
-	}
-
-	if val.Kind() != reflect.Struct {
-		return nil, fmt.Errorf("query: Values() expects struct input. Got %v", val.Kind())
-	}
-
-	err := reflectValue(values, val, "")
-	return values, err
-}
-
-// reflectValue populates the values parameter from the struct fields in val.
-// Embedded structs are followed recursively (using the rules defined in the
-// Values function documentation) breadth-first.
-func reflectValue(values url.Values, val reflect.Value, scope string) error {
-	var embedded []reflect.Value
-
-	typ := val.Type()
-	for i := 0; i < typ.NumField(); i++ {
-		sf := typ.Field(i)
-		if sf.PkgPath != "" && !sf.Anonymous { // unexported
-			continue
-		}
-
-		sv := val.Field(i)
-		tag := sf.Tag.Get("url")
-		if tag == "-" {
-			continue
-		}
-		name, opts := parseTag(tag)
-		if name == "" {
-			if sf.Anonymous && sv.Kind() == reflect.Struct {
-				// save embedded struct for later processing
-				embedded = append(embedded, sv)
-				continue
-			}
-
-			name = sf.Name
-		}
-
-		if scope != "" {
-			name = scope + "[" + name + "]"
-		}
-
-		if opts.Contains("omitempty") && isEmptyValue(sv) {
-			continue
-		}
-
-		if sv.Type().Implements(encoderType) {
-			if !reflect.Indirect(sv).IsValid() {
-				sv = reflect.New(sv.Type().Elem())
-			}
-
-			m := sv.Interface().(Encoder)
-			if err := m.EncodeValues(name, &values); err != nil {
-				return err
-			}
-			continue
-		}
-
-		if sv.Kind() == reflect.Slice || sv.Kind() == reflect.Array {
-			var del byte
-			if opts.Contains("comma") {
-				del = ','
-			} else if opts.Contains("space") {
-				del = ' '
-			} else if opts.Contains("semicolon") {
-				del = ';'
-			} else if opts.Contains("brackets") {
-				name = name + "[]"
-			}
-
-			if del != 0 {
-				s := new(bytes.Buffer)
-				first := true
-				for i := 0; i < sv.Len(); i++ {
-					if first {
-						first = false
-					} else {
-						s.WriteByte(del)
-					}
-					s.WriteString(valueString(sv.Index(i), opts))
-				}
-				values.Add(name, s.String())
-			} else {
-				for i := 0; i < sv.Len(); i++ {
-					k := name
-					if opts.Contains("numbered") {
-						k = fmt.Sprintf("%s%d", name, i)
-					}
-					values.Add(k, valueString(sv.Index(i), opts))
-				}
-			}
-			continue
-		}
-
-		for sv.Kind() == reflect.Ptr {
-			if sv.IsNil() {
-				break
-			}
-			sv = sv.Elem()
-		}
-
-		if sv.Type() == timeType {
-			values.Add(name, valueString(sv, opts))
-			continue
-		}
-
-		if sv.Kind() == reflect.Struct {
-			reflectValue(values, sv, name)
-			continue
-		}
-
-		values.Add(name, valueString(sv, opts))
-	}
-
-	for _, f := range embedded {
-		if err := reflectValue(values, f, scope); err != nil {
-			return err
-		}
-	}
-
-	return nil
-}
-
-// valueString returns the string representation of a value.
-func valueString(v reflect.Value, opts tagOptions) string {
-	for v.Kind() == reflect.Ptr {
-		if v.IsNil() {
-			return ""
-		}
-		v = v.Elem()
-	}
-
-	if v.Kind() == reflect.Bool && opts.Contains("int") {
-		if v.Bool() {
-			return "1"
-		}
-		return "0"
-	}
-
-	if v.Type() == timeType {
-		t := v.Interface().(time.Time)
-		if opts.Contains("unix") {
-			return strconv.FormatInt(t.Unix(), 10)
-		}
-		return t.Format(time.RFC3339)
-	}
-
-	return fmt.Sprint(v.Interface())
-}
-
-// isEmptyValue checks if a value should be considered empty for the purposes
-// of omitting fields with the "omitempty" option.
-func isEmptyValue(v reflect.Value) bool {
-	switch v.Kind() {
-	case reflect.Array, reflect.Map, reflect.Slice, reflect.String:
-		return v.Len() == 0
-	case reflect.Bool:
-		return !v.Bool()
-	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
-		return v.Int() == 0
-	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
-		return v.Uint() == 0
-	case reflect.Float32, reflect.Float64:
-		return v.Float() == 0
-	case reflect.Interface, reflect.Ptr:
-		return v.IsNil()
-	}
-
-	if v.Type() == timeType {
-		return v.Interface().(time.Time).IsZero()
-	}
-
-	return false
-}
-
-// tagOptions is the string following a comma in a struct field's "url" tag, or
-// the empty string. It does not include the leading comma.
-type tagOptions []string
-
-// parseTag splits a struct field's url tag into its name and comma-separated
-// options.
-func parseTag(tag string) (string, tagOptions) {
-	s := strings.Split(tag, ",")
-	return s[0], s[1:]
-}
-
-// Contains checks whether the tagOptions contains the specified option.
-func (o tagOptions) Contains(option string) bool {
-	for _, s := range o {
-		if s == option {
-			return true
-		}
-	}
-	return false
-}

vendor/modules.txt

@@ -1,2 +0,0 @@
-# github.com/google/go-querystring v0.0.0-20170111101155-53e6ce116135
-github.com/google/go-querystring/query