Handle TooManyRequests error (#53)

Co-authored-by: Eugene Simonov <eugene.simonov@evergen.com.au>

.github/workflows/go.yml

@@ -16,7 +16,7 @@ jobs:
     - name: Set up Go
       uses: actions/setup-go@v2
       with:
-        go-version: 1.16
+        go-version: 1.17
 
     - name: Build
       run: go build -v ./...

.github/workflows/golangci-lint.yml

@@ -15,4 +15,4 @@ jobs:
       - name: golangci-lint
         uses: golangci/golangci-lint-action@v2
         with:
-          version: v1.37
+          version: v1.41.1

database.go

@@ -119,6 +119,7 @@ type Artist struct {
 	ResourceURL    string   `json:"resource_url"`
 	URI            string   `json:"uri"`
 	URLs           []string `json:"urls"`
+	Groups         []Member `json:"groups,omitempty"`
 	DataQuality    string   `json:"data_quality"`
 }
 

discogs.go

@@ -105,6 +105,8 @@ func request(path string, params url.Values, resp interface{}) error {
 		switch response.StatusCode {
 		case http.StatusUnauthorized:
 			return ErrUnauthorized
+		case http.StatusTooManyRequests:
+			return ErrTooManyRequests
 		default:
 			return fmt.Errorf("unknown error: %s", response.Status)
 		}

errors.go

@@ -16,10 +16,11 @@ func (e *Error) Error() string {
 
 // APIErrors
 var (
-	ErrUnauthorized         = &Error{"authentication required"}
 	ErrCurrencyNotSupported = &Error{"currency does not supported"}
-	ErrUserAgentInvalid     = &Error{"invalid user-agent"}
 	ErrInvalidReleaseID     = &Error{"invalid release id"}
 	ErrInvalidSortKey       = &Error{"invalid sort key"}
 	ErrInvalidUsername      = &Error{"invalid username"}
+	ErrTooManyRequests      = &Error{"too many requests"}
+	ErrUnauthorized         = &Error{"authentication required"}
+	ErrUserAgentInvalid     = &Error{"invalid user-agent"}
 )