fix: stop stale request retries

integrations/jikan/client.go

@@ -3,6 +3,7 @@ package jikan
 import (
 	"context"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"reflect"
 	"sync"
@@ -98,6 +99,10 @@ func jikanCacheLogLevel(source string, err error) observability.LogLevel {
 }
 
 func (c *Client) logJikanCache(cacheKey string, source string, startedAt time.Time, err error) {
+	if isContextError(err) {
+		return
+	}
+
 	duration := time.Since(startedAt)
 	if c.shouldSkipJikanCacheLog(source, duration, err) {
 		return
@@ -125,6 +130,10 @@ func truncateErrorMessage(message string) string {
 	return message[:400]
 }
 
+func isContextError(err error) bool {
+	return errors.Is(err, context.Canceled) || errors.Is(err, context.DeadlineExceeded)
+}
+
 // notifyRetryWorker signals the retry worker, non-blocking.
 func (c *Client) notifyRetryWorker() {
 	select {

integrations/jikan/rate/limiter.go

@@ -2,7 +2,6 @@ package rate
 
 import (
 	"context"
-	"fmt"
 	"sync"
 	"time"
 )
@@ -19,6 +18,12 @@ func NewLimiter(interval time.Duration) *Limiter {
 
 // Wait enforces minimum spacing between upstream Jikan requests.
 func (l *Limiter) Wait(ctx context.Context) error {
+	select {
+	case <-ctx.Done():
+		return ctx.Err()
+	default:
+	}
+
 	waitUntil := l.reserve(time.Now())
 	if waitUntil.IsZero() {
 		return nil
@@ -31,7 +36,8 @@ func (l *Limiter) Wait(ctx context.Context) error {
 	case <-timer.C:
 		return nil
 	case <-ctx.Done():
-		return fmt.Errorf("request canceled while waiting for rate limit: %w", ctx.Err())
+		l.release(waitUntil)
+		return ctx.Err()
 	}
 }
 
@@ -48,3 +54,13 @@ func (l *Limiter) reserve(now time.Time) time.Time {
 	l.nextReqTime = l.nextReqTime.Add(l.interval)
 	return waitUntil
 }
+
+func (l *Limiter) release(waitUntil time.Time) {
+	l.mu.Lock()
+	defer l.mu.Unlock()
+
+	reservationEnd := waitUntil.Add(l.interval)
+	if l.nextReqTime.Equal(reservationEnd) {
+		l.nextReqTime = waitUntil
+	}
+}

integrations/jikan/transport/client.go

@@ -67,6 +67,9 @@ func IsRetryableError(err error) bool {
 	if err == nil {
 		return false
 	}
+	if errors.Is(err, context.Canceled) {
+		return false
+	}
 
 	var apiErr *APIError
 	if errors.As(err, &apiErr) {
@@ -92,6 +95,9 @@ func (c *Client) FetchWithRetry(ctx context.Context, urlStr string, out any) err
 	attempts := 0
 	endpoint := metricsEndpoint(urlStr)
 	logAndReturn := func(statusCode int, err error) error {
+		if isDoneContextError(ctx, err) {
+			return err
+		}
 		c.Metrics.ObserveJikanRequest(endpoint, statusCode, time.Since(startedAt), err)
 		c.logUpstream(urlStr, statusCode, attempts, startedAt, err)
 		return err
@@ -127,7 +133,7 @@ func (c *Client) FetchWithRetry(ctx context.Context, urlStr string, out any) err
 func (c *Client) prepareRetryAttempt(ctx context.Context) error {
 	select {
 	case <-ctx.Done():
-		return fmt.Errorf("request canceled while retrying jikan request: %w", ctx.Err())
+		return ctx.Err()
 	default:
 	}
 
@@ -150,8 +156,11 @@ func (c *Client) doRequest(ctx context.Context, urlStr string) (*http.Response,
 }
 
 func handleRequestRetry(ctx context.Context, err error, attempt int, maxRetries int) (bool, error) {
+	if ctx.Err() != nil {
+		return false, ctx.Err()
+	}
 	if errors.Is(err, context.Canceled) {
-		return false, fmt.Errorf("request canceled while retrying jikan request: %w", err)
+		return false, err
 	}
 
 	if attempt >= maxRetries-1 || !IsRetryableError(err) {
@@ -253,10 +262,14 @@ func waitForRetry(ctx context.Context, delay time.Duration) error {
 	case <-timer.C:
 		return nil
 	case <-ctx.Done():
-		return fmt.Errorf("request canceled while retrying jikan request: %w", ctx.Err())
+		return ctx.Err()
 	}
 }
 
+func isDoneContextError(ctx context.Context, err error) bool {
+	return err != nil && ctx.Err() != nil && errors.Is(err, ctx.Err())
+}
+
 func (c *Client) logUpstream(urlStr string, statusCode int, attempts int, startedAt time.Time, err error) {
 	duration := time.Since(startedAt)
 	traceEnabled := c.TraceEnabled != nil && c.TraceEnabled()

internal/anime/details_handler.go

@@ -2,6 +2,7 @@ package anime
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"mal/integrations/jikan"
 	"mal/internal/domain"
@@ -181,6 +182,9 @@ func (h *AnimeHandler) handleAnimeDetailsSection(c *gin.Context, id int, section
 
 	data, tplName, err := h.loadAnimeDetailsSection(sectionCtx, id, section)
 	if err != nil {
+		if errors.Is(err, context.Canceled) {
+			return
+		}
 		observability.Warn(
 			"anime_section_fetch_failed",
 			"anime",

internal/playback/handler/proxy_stream.go

@@ -48,6 +48,9 @@ func (h *PlaybackHandler) HandleProxyStream(c *gin.Context) {
 	copyProxyHeaders(c.Writer.Header(), resp.Header)
 	c.Status(resp.StatusCode)
 	if n, err := io.Copy(c.Writer, resp.Body); err != nil {
+		if errors.Is(err, context.Canceled) || c.Request.Context().Err() != nil {
+			return
+		}
 		observability.WarnContext(c.Request.Context(), "proxy_stream_copy_failed", "playback", "", map[string]any{"target_url": targetURL, "bytes_copied": n}, err)
 	}
 }