Refactored common rate limit code into separate module

internal/backends/listenbrainz/client.go

@@ -23,20 +23,18 @@ package listenbrainz
 
 import (
 	"errors"
-	"net/http"
 	"strconv"
 	"time"
 
 	"github.com/go-resty/resty/v2"
+	"go.uploadedlobster.com/scotty/internal/ratelimit"
 )
 
-const listenBrainzBaseURL = "https://api.listenbrainz.org/1/"
-
 const (
-	DefaultItemsPerGet          = 25
-	MaxItemsPerGet              = 1000
-	MaxListensPerRequest        = 1000
-	DefaultRateLimitWaitSeconds = 5
+	listenBrainzBaseURL  = "https://api.listenbrainz.org/1/"
+	DefaultItemsPerGet   = 25
+	MaxItemsPerGet       = 1000
+	MaxListensPerRequest = 1000
 )
 
 type Client struct {
@@ -52,25 +50,7 @@ func NewClient(token string) Client {
 	client.SetHeader("Accept", "application/json")
 
 	// Handle rate limiting (see https://listenbrainz.readthedocs.io/en/latest/users/api/index.html#rate-limiting)
-	client.SetRetryCount(5)
-	client.AddRetryCondition(
-		func(r *resty.Response, err error) bool {
-			code := r.StatusCode()
-			return code == http.StatusTooManyRequests || code >= http.StatusInternalServerError
-		},
-	)
-	client.SetRetryMaxWaitTime(time.Duration(1 * time.Minute))
-	client.SetRetryAfter(func(client *resty.Client, resp *resty.Response) (time.Duration, error) {
-		var err error
-		var retryAfter int = DefaultRateLimitWaitSeconds
-		if resp.StatusCode() == http.StatusTooManyRequests {
-			retryAfter, err = strconv.Atoi(resp.Header().Get("X-RateLimit-Reset-In"))
-			if err != nil {
-				retryAfter = DefaultRateLimitWaitSeconds
-			}
-		}
-		return time.Duration(retryAfter * int(time.Second)), err
-	})
+	ratelimit.EnableHTTPHeaderRateLimit(client, "X-RateLimit-Reset-In")
 
 	return Client{
 		HttpClient: client,