Code maintenance: use native Go HTTP client

internal/publicip/publicip.go

@@ -3,12 +3,11 @@ package publicip
 import (
 	"context"
 	"fmt"
+	"io/ioutil"
 	"math/rand"
 	"net"
 	"net/http"
 	"strings"
-
-	"github.com/qdm12/golibs/network"
 )
 
 type IPGetter interface {
@@ -16,11 +15,11 @@ type IPGetter interface {
 }
 
 type ipGetter struct {
-	client   network.Client
+	client   *http.Client
 	randIntn func(n int) int
 }
 
-func NewIPGetter(client network.Client) IPGetter {
+func NewIPGetter(client *http.Client) IPGetter {
 	return &ipGetter{
 		client:   client,
 		randIntn: rand.Intn,
@@ -39,12 +38,27 @@ func (i *ipGetter) Get(ctx context.Context) (ip net.IP, err error) {
 		"https://ipinfo.io/ip",
 	}
 	url := urls[i.randIntn(len(urls))]
-	content, status, err := i.client.Get(ctx, url, network.UseRandomUserAgent())
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
 	if err != nil {
 		return nil, err
-	} else if status != http.StatusOK {
-		return nil, fmt.Errorf("received unexpected status code %d from %s", status, url)
 	}
+
+	response, err := i.client.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer response.Body.Close()
+
+	if response.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("%w from %s: %s", ErrBadStatusCode, url, response.Status)
+	}
+
+	content, err := ioutil.ReadAll(response.Body)
+	if err != nil {
+		return nil, fmt.Errorf("%w: %s", ErrCannotReadBody, err)
+	}
+
 	s := strings.ReplaceAll(string(content), "\n", "")
 	ip = net.ParseIP(s)
 	if ip == nil {