feat: Retry mechanism added

Author: RawanMostafa08

go.mod

@@ -3,6 +3,6 @@ module github.com/codescalersinternships/PokeAPIHTTPClient-RawanMostafa
 go 1.23.1
 
 require (
-	github.com/cenkalti/backoff/v4 v4.3.0
+	github.com/cenkalti/backoff v2.2.1+incompatible
 	golang.org/x/exp v0.0.0-20240909161429-701f63a606c0
 )

go.sum

@@ -1,4 +1,4 @@
-github.com/cenkalti/backoff/v4 v4.3.0 h1:MyRJ/UdXutAwSAT+s3wNd7MfTIcy71VQueUuFK343L8=
-github.com/cenkalti/backoff/v4 v4.3.0/go.mod h1:Y3VNntkOUPxTVeUxJ/G5vcM//AlwfmyYozVcomhLiZE=
+github.com/cenkalti/backoff v2.2.1+incompatible h1:tNowT99t7UNflLxfYYSlKYsBpXdEet03Pg2g16Swow4=
+github.com/cenkalti/backoff v2.2.1+incompatible/go.mod h1:90ReRw6GdpyfrHakVjL/QHaoyV4aDUVVkXQJJJ3NXXM=
 golang.org/x/exp v0.0.0-20240909161429-701f63a606c0 h1:e66Fs6Z+fZTbFBAxKfP3PALWBtpfqks2bwGcexMxgtk=
 golang.org/x/exp v0.0.0-20240909161429-701f63a606c0/go.mod h1:2TbTHSBQa924w8M6Xs1QcRcFwyucIwBGpK1p2f1YFFY=

pkg/httpUtil.go

@@ -47,6 +47,7 @@ func (c Client) sendRequest(options ...int) (*http.Response, error) {
 		offset = options[0]
 	}
 
+
 	url := baseUrl + c.Endpoint + fmt.Sprintf("?offset=%d&limit=%d", offset, limit)
 
 	req, err := http.NewRequest("GET", url, nil)

pkg/pokemon.go

@@ -4,18 +4,35 @@ package pokemon
 import (
 	"encoding/json"
 	"fmt"
+	"net/http"
+	"time"
 
+	"github.com/cenkalti/backoff"
 	"golang.org/x/exp/slog"
 )
-// Pokemon takes the pokemon id as an integer, send the request with the /pokemon endpoint 
+
+// Pokemon takes the pokemon id as an integer, send the request with the /pokemon endpoint
 // parses the response and returns the Pokemon object and an error if exists
 func (c Client) Pokemon(id int) (pokemon Pokemon, err error) {
 	c.Endpoint = fmt.Sprintf("/pokemon/%d", id)
-	resp, err := c.sendRequest()
-	if err != nil {
-		slog.Error("error in sending the request: %w", err)
-		return
+
+	var resp *http.Response
+
+	expBackoff := backoff.NewExponentialBackOff()
+	expBackoff.MaxElapsedTime = 10 * time.Second
+
+	retryError := backoff.RetryNotify(func() error {
+		resp, err = c.sendRequest()
+		return err
+	}, expBackoff, func(err error, d time.Duration) {
+		slog.Warn("Request failed, Retrying ...")
+	})
+
+	if retryError != nil {
+		slog.Error("failed to make the request after retries: %v", err)
+		return pokemon, retryError
 	}
+
 	body, err := readBody(resp)
 	if err != nil {
 		slog.Error("error in reading the response body: %w", err)