feat(gitea): read retry once on 5xx GET

internal/gitea/client.go

@@ -22,7 +22,7 @@ func NewClient(baseURL, token string) *Client {
 	}
 }
 
-func (c *Client) do(ctx context.Context, method, path string, body []byte) ([]byte, int, error) {
+func (c *Client) doOnce(ctx context.Context, method, path string, body []byte) ([]byte, int, error) {
 	var reader io.Reader
 	if body != nil {
 		reader = bytes.NewReader(body)
@@ -48,6 +48,15 @@ func (c *Client) do(ctx context.Context, method, path string, body []byte) ([]by
 	return b, resp.StatusCode, err
 }
 
+func (c *Client) do(ctx context.Context, method, path string, body []byte) ([]byte, int, error) {
+	b, status, err := c.doOnce(ctx, method, path, body)
+	if err == nil && method == http.MethodGet && status >= 500 && status < 600 {
+		time.Sleep(250 * time.Millisecond)
+		return c.doOnce(ctx, method, path, body)
+	}
+	return b, status, err
+}
+
 func (c *Client) GetJSON(ctx context.Context, path string) ([]byte, int, error) {
 	return c.do(ctx, http.MethodGet, path, nil)
 }

internal/gitea/client_test.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"net/http"
 	"net/http/httptest"
+	"sync/atomic"
 	"testing"
 
 	"gitea.d-ma.be/mathias/gitea-mcp/internal/gitea"
@@ -27,3 +28,37 @@ func TestClientGetsTokenInHeader(t *testing.T) {
 	assert.Contains(t, string(body), `"ok":true`)
 	assert.Equal(t, "token test-token", gotAuth)
 }
+
+func TestRetryOn5xxGetSucceedsOnSecondAttempt(t *testing.T) {
+	var attempts int32
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		n := atomic.AddInt32(&attempts, 1)
+		if n == 1 {
+			http.Error(w, "boom", http.StatusServiceUnavailable)
+			return
+		}
+		w.Header().Set("Content-Type", "application/json")
+		_, _ = w.Write([]byte(`{"ok":true}`))
+	}))
+	defer srv.Close()
+
+	c := gitea.NewClient(srv.URL, "tok")
+	body, status, err := c.GetJSON(context.Background(), "/api/v1/test")
+	require.NoError(t, err)
+	assert.Equal(t, 200, status)
+	assert.Contains(t, string(body), `"ok":true`)
+	assert.Equal(t, int32(2), atomic.LoadInt32(&attempts))
+}
+
+func TestRetryOnPostNotRetried(t *testing.T) {
+	var attempts int32
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+		atomic.AddInt32(&attempts, 1)
+		http.Error(w, "boom", http.StatusServiceUnavailable)
+	}))
+	defer srv.Close()
+
+	c := gitea.NewClient(srv.URL, "tok")
+	_, _, _ = c.PostJSON(context.Background(), "/api/v1/test", []byte(`{}`))
+	assert.Equal(t, int32(1), atomic.LoadInt32(&attempts), "POST should not retry")
+}