calculate content length before upload

libs/filer/dbfs_client.go

@@ -1,6 +1,7 @@
 package filer
 
 import (
+	"bytes"
 	"context"
 	"errors"
 	"fmt"
@@ -99,6 +100,36 @@ func NewDbfsClient(w *databricks.WorkspaceClient, root string) (Filer, error) {
 	}, nil
 }
 
+// The PUT API for DBFS requires setting the content length header beforehand in the HTTP
+// request.
+func putContentLength(path string, overwriteField string, file *os.File) (int64, error) {
+	buf := &bytes.Buffer{}
+	writer := multipart.NewWriter(buf)
+	err := writer.WriteField("path", path)
+	if err != nil {
+		return 0, fmt.Errorf("failed to write field path field in multipart form: %w", err)
+	}
+	err = writer.WriteField("overwrite", overwriteField)
+	if err != nil {
+		return 0, fmt.Errorf("failed to write field overwrite field in multipart form: %w", err)
+	}
+	_, err = writer.CreateFormFile("contents", "")
+	if err != nil {
+		return 0, fmt.Errorf("failed to write contents field in multipart form: %w", err)
+	}
+	err = writer.Close()
+	if err != nil {
+		return 0, fmt.Errorf("failed to close multipart form writer: %w", err)
+	}
+
+	stat, err := file.Stat()
+	if err != nil {
+		return 0, fmt.Errorf("failed to stat file %s: %w", path, err)
+	}
+
+	return int64(buf.Len()) + stat.Size(), nil
+}
+
 func (w *DbfsClient) putFile(ctx context.Context, path string, overwrite bool, file *os.File) error {
 	overwriteField := "False"
 	if overwrite {
@@ -112,17 +143,17 @@ func (w *DbfsClient) putFile(ctx context.Context, path string, overwrite bool, f
 
 		err := writer.WriteField("path", path)
 		if err != nil {
-			pw.CloseWithError(fmt.Errorf("failed to write field path field in multipath form: %w", err))
+			pw.CloseWithError(fmt.Errorf("failed to write field path field in multipart form: %w", err))
 			return
 		}
 		err = writer.WriteField("overwrite", overwriteField)
 		if err != nil {
-			pw.CloseWithError(fmt.Errorf("failed to write field overwrite field in multipath form: %w", err))
+			pw.CloseWithError(fmt.Errorf("failed to write field overwrite field in multipart form: %w", err))
 			return
 		}
 		contents, err := writer.CreateFormFile("contents", "")
 		if err != nil {
-			pw.CloseWithError(fmt.Errorf("failed to write contents field in multipath form: %w", err))
+			pw.CloseWithError(fmt.Errorf("failed to write contents field in multipart form: %w", err))
 			return
 		}
 		for {
@@ -133,21 +164,27 @@ func (w *DbfsClient) putFile(ctx context.Context, path string, overwrite bool, f
 				break
 			}
 			if err != nil {
-				pw.CloseWithError(fmt.Errorf("failed to copy file in multipath form: %w", err))
+				pw.CloseWithError(fmt.Errorf("failed to copy file in multipart form: %w", err))
 				return
 			}
 		}
 		err = writer.Close()
 		if err != nil {
-			pw.CloseWithError(fmt.Errorf("failed to close multipath form writer: %w", err))
+			pw.CloseWithError(fmt.Errorf("failed to close multipart form writer: %w", err))
 			return
 		}
 	}()
 
+	cl, err := putContentLength(path, overwriteField, file)
+	if err != nil {
+		return fmt.Errorf("failed to calculate content length: %w", err)
+	}
+
 	// Request bodies of Content-Type multipart/form-data are not supported by
 	// the Go SDK directly for DBFS. So we use the Do method directly.
-	err := w.apiClient.Do(ctx, http.MethodPost, "/api/2.0/dbfs/put", map[string]string{
+	err = w.apiClient.Do(ctx, http.MethodPost, "/api/2.0/dbfs/put", map[string]string{
-		"Content-Type": writer.FormDataContentType(),
+		"Content-Type":   writer.FormDataContentType(),
+		"Content-Length": fmt.Sprintf("%d", cl),
 	}, pr, nil)
 	var aerr *apierr.APIError
 	if errors.As(err, &aerr) && aerr.ErrorCode == "RESOURCE_ALREADY_EXISTS" {