Centralize atomic artifact writes

internal/adapters/weatherapi/client.go

@@ -11,14 +11,13 @@ import (
 	"io"
 	"net/http"
 	"net/url"
-	"os"
 	"path"
-	"path/filepath"
 	"strconv"
 	"strings"
 	"time"
 
 	"gitea.maximumdirect.net/eric/weatherreporter/internal/config"
+	"gitea.maximumdirect.net/eric/weatherreporter/internal/fileutil"
 	"gitea.maximumdirect.net/eric/weatherreporter/internal/forecast"
 )
 
@@ -398,29 +397,8 @@ func sourceHash(raw json.RawMessage) (string, error) {
 }
 
 func SaveBundle(path string, bundle *forecast.Bundle) error {
-	data, err := json.MarshalIndent(bundle, "", "  ")
-	if err != nil {
-		return fmt.Errorf("marshal forecast bundle: %w", err)
-	}
-	if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil {
-		return fmt.Errorf("create bundle directory %q: %w", filepath.Dir(path), err)
-	}
-	tmp, err := os.CreateTemp(filepath.Dir(path), "."+filepath.Base(path)+".*.tmp")
-	if err != nil {
-		return fmt.Errorf("create temporary bundle file: %w", err)
-	}
-	tmpName := tmp.Name()
-	defer os.Remove(tmpName)
-
-	if _, err := tmp.Write(data); err != nil {
-		tmp.Close()
-		return fmt.Errorf("write temporary bundle file: %w", err)
-	}
-	if err := tmp.Close(); err != nil {
-		return fmt.Errorf("close temporary bundle file: %w", err)
-	}
-	if err := os.Rename(tmpName, path); err != nil {
-		return fmt.Errorf("save bundle %q: %w", path, err)
+	if err := fileutil.WriteJSONAtomic(path, bundle); err != nil {
+		return fmt.Errorf("save bundle: %w", err)
 	}
 	return nil
 }