replaced log with slog in internal/cache

internal/cache/fetch.go

@@ -1,7 +1,8 @@
 package cache
 
 import (
-	"log"
+	"errors"
+	"log/slog"
 	"os"
 	"path/filepath"
 )
@@ -15,8 +16,7 @@ func (c *Cache) Fetch(relPath string) (*CacheFile, error) {
 
 	// fetch file from upstream
 	_, err, _ = c.sf.Do(relPath, func() (any, error) {
-		// #log info
-		log.Print("calling fetch")
+		slog.Info("calling fetch")
 		return nil, c.fetch(relPath)
 	})
 	if err != nil {
@@ -46,8 +46,11 @@ func (c *Cache) fetch(relPath string) error {
 		if err == nil {
 			break
 		}
-		// #log warn or info
-		log.Printf("mirror %s returned %v", url, err)
+		if upstreamErr, ok := errors.AsType[*UpstreamError](err); ok {
+			slog.Warn("mirror failed", "url", url, "status", upstreamErr.StatusCode)
+		} else {
+			slog.Warn("mirror unreachable", "url", url, "err", err)
+		}
 	}
 	if err != nil {
 		return err

internal/cache/helpers.go

@@ -2,7 +2,7 @@ package cache
 
 import (
 	"io"
-	"log"
+	"log/slog"
 	"net/http"
 	"os"
 )
@@ -13,27 +13,22 @@ func (c *Cache) nextMirror() string {
 }
 
 func downloadToDisk(url, destPath string, c http.Client) error {
-	// #log info
-	log.Printf("fetching %v", url)
+	slog.Info("fetching", "url", url)
 
 	// set the user agent
 	req, err := http.NewRequest("GET", url, nil)
 	if err != nil {
-		// #log info
-		log.Printf("failed to create request: %v", err)
-		return &UpstreamError{StatusCode: http.StatusInternalServerError}
+		slog.Error("failed create request", "err", err)
 	}
 	req.Header.Set("User-Agent", userAgent)
 
 	resp, err := c.Do(req)
 	if err != nil {
-		// #log warn
-		log.Printf("error fetching %s: %v", url, err)
+		slog.Warn("fetch failed", "url", url, "err", err)
 		return err
 	}
 	if resp.StatusCode != 200 {
-		// #log info
-		log.Printf("GET %s returned %d", url, resp.StatusCode)
+		slog.Info("fetch returned", "url", url, "status", resp.StatusCode)
 		return &UpstreamError{StatusCode: resp.StatusCode}
 	}
 	defer resp.Body.Close()