Unlock read lock on uploadID upon errors (#6283)

cmd/object-api-errors.go

@@ -314,10 +314,15 @@ func (e InvalidUploadID) Error() string {
 }
 
 // InvalidPart One or more of the specified parts could not be found
-type InvalidPart struct{}
+type InvalidPart struct {
+	PartNumber int
+	ExpETag    string
+	GotETag    string
+}
 
 func (e InvalidPart) Error() string {
-	return "One or more of the specified parts could not be found. The part may not have been uploaded, or the specified entity tag may not match the part's entity tag."
+	return fmt.Sprintf("Specified part could not be found. PartNumber %d, Expected %s, got %s",
+		e.PartNumber, e.ExpETag, e.GotETag)
 }
 
 // PartTooSmall - error if part size is less than 5MB.

cmd/object-api-multipart_test.go

@@ -19,8 +19,10 @@ package cmd
 import (
 	"bytes"
 	"context"
+	"encoding/hex"
 	"fmt"
 	"os"
+	"reflect"
 	"strings"
 	"testing"
 
@@ -1877,8 +1879,8 @@ func testObjectCompleteMultipartUpload(obj ObjectLayer, instanceType string, t T
 		// Asserting for Invalid UploadID (Test number 9).
 		{bucketNames[0], objectNames[0], "abc", []CompletePart{}, "", InvalidUploadID{UploadID: "abc"}, false},
 		// Test case with invalid Part Etag (Test number 10-11).
-		{bucketNames[0], objectNames[0], uploadIDs[0], []CompletePart{{ETag: "abc"}}, "", fmt.Errorf("encoding/hex: odd length hex string"), false},
+		{bucketNames[0], objectNames[0], uploadIDs[0], []CompletePart{{ETag: "abc"}}, "", hex.ErrLength, false},
-		{bucketNames[0], objectNames[0], uploadIDs[0], []CompletePart{{ETag: "abcz"}}, "", fmt.Errorf("encoding/hex: invalid byte: U+007A 'z'"), false},
+		{bucketNames[0], objectNames[0], uploadIDs[0], []CompletePart{{ETag: "abcz"}}, "", hex.InvalidByteError(00), false},
 		// Part number 0 doesn't exist, expecting InvalidPart error (Test number 12).
 		{bucketNames[0], objectNames[0], uploadIDs[0], []CompletePart{{ETag: "abcd", PartNumber: 0}}, "", InvalidPart{}, false},
 		// // Upload and PartNumber exists, But a deliberate ETag mismatch is introduced (Test number 13).
@@ -1909,7 +1911,7 @@ func testObjectCompleteMultipartUpload(obj ObjectLayer, instanceType string, t T
 		}
 		// Failed as expected, but does it fail for the expected reason.
 		if actualErr != nil && !testCase.shouldPass {
-			if !strings.Contains(actualErr.Error(), testCase.expectedErr.Error()) {
+			if reflect.TypeOf(actualErr) != reflect.TypeOf(testCase.expectedErr) {
 				t.Errorf("Test %d: %s: Expected to fail with error \"%s\", but instead failed with error \"%s\"", i+1, instanceType, testCase.expectedErr, actualErr)
 			}
 		}

cmd/xl-v1-multipart.go

@@ -331,6 +331,7 @@ func (xl xlObjects) PutObjectPart(ctx context.Context, bucket, object, uploadID
 	// get Quorum for this object
 	_, writeQuorum, err := objectQuorumFromMeta(ctx, xl, partsMetadata, errs)
 	if err != nil {
+		preUploadIDLock.RUnlock()
 		return pi, toObjectErr(err, bucket, object)
 	}
 
@@ -665,14 +666,23 @@ func (xl xlObjects) CompleteMultipartUpload(ctx context.Context, bucket string,
 		partIdx := objectPartIndex(currentXLMeta.Parts, part.PartNumber)
 		// All parts should have same part number.
 		if partIdx == -1 {
-			logger.LogIf(ctx, InvalidPart{})
+			invp := InvalidPart{
-			return oi, InvalidPart{}
+				PartNumber: part.PartNumber,
+				GotETag:    part.ETag,
+			}
+			logger.LogIf(ctx, invp)
+			return oi, invp
 		}
 
 		// All parts should have same ETag as previously generated.
 		if currentXLMeta.Parts[partIdx].ETag != part.ETag {
-			logger.LogIf(ctx, InvalidPart{})
+			invp := InvalidPart{
-			return oi, InvalidPart{}
+				PartNumber: part.PartNumber,
+				ExpETag:    currentXLMeta.Parts[partIdx].ETag,
+				GotETag:    part.ETag,
+			}
+			logger.LogIf(ctx, invp)
+			return oi, invp
 		}
 
 		// All parts except the last part has to be atleast 5MB.