notifications: Fix bucket notifications for DeleteMultipleObjects. (#2609)

Now reports bucket notifications for DeleteMultipleObjects API.
Also deletes multiple objects in parallel.

cmd/bucket-handlers.go

@@ -23,6 +23,7 @@ import (
 	"net/url"
 	"path"
 	"strings"
+	"sync"
 
 	mux "github.com/gorilla/mux"
 	"github.com/minio/minio-go/pkg/set"
@@ -240,24 +241,41 @@ func (api objectAPIHandlers) DeleteMultipleObjectsHandler(w http.ResponseWriter,
 		return
 	}
 
-	var deleteErrors []DeleteError
+	var wg = &sync.WaitGroup{} // Allocate a new wait group.
+	var dErrs = make([]error, len(deleteObjects.Objects))
+
+	// Delete all requested objects in parallel.
+	for index, object := range deleteObjects.Objects {
+		wg.Add(1)
+		go func(i int, obj ObjectIdentifier) {
+			defer wg.Done()
+			dErr := api.ObjectAPI.DeleteObject(bucket, obj.ObjectName)
+			if dErr != nil {
+				dErrs[i] = dErr
+			}
+		}(index, object)
+	}
+	wg.Wait()
+
+	// Collect deleted objects and errors if any.
 	var deletedObjects []ObjectIdentifier
-	// Loop through all the objects and delete them sequentially.
-	for _, object := range deleteObjects.Objects {
-		err := api.ObjectAPI.DeleteObject(bucket, object.ObjectName)
+	var deleteErrors []DeleteError
+	for index, err := range dErrs {
+		object := deleteObjects.Objects[index]
+		// Success deleted objects are collected separately.
 		if err == nil {
-			deletedObjects = append(deletedObjects, ObjectIdentifier{
-				ObjectName: object.ObjectName,
-			})
-		} else {
-			errorIf(err, "Unable to delete object.")
-			deleteErrors = append(deleteErrors, DeleteError{
-				Code:    errorCodeResponse[toAPIErrorCode(err)].Code,
-				Message: errorCodeResponse[toAPIErrorCode(err)].Description,
-				Key:     object.ObjectName,
-			})
+			deletedObjects = append(deletedObjects, object)
+			continue
 		}
+		errorIf(err, "Unable to delete object. %s", object.ObjectName)
+		// Error during delete should be collected separately.
+		deleteErrors = append(deleteErrors, DeleteError{
+			Code:    errorCodeResponse[toAPIErrorCode(err)].Code,
+			Message: errorCodeResponse[toAPIErrorCode(err)].Description,
+			Key:     object.ObjectName,
+		})
 	}
+
 	// Generate response
 	response := generateMultiDeleteResponse(deleteObjects.Quiet, deletedObjects, deleteErrors)
 	encodedSuccessResponse := encodeResponse(response)
@@ -265,6 +283,22 @@ func (api objectAPIHandlers) DeleteMultipleObjectsHandler(w http.ResponseWriter,
 	setCommonHeaders(w)
 	// Write success response.
 	writeSuccessResponse(w, encodedSuccessResponse)
+
+	if eventN.IsBucketNotificationSet(bucket) {
+		// Notify deleted event for objects.
+		for _, dobj := range deletedObjects {
+			eventNotify(eventData{
+				Type:   ObjectRemovedDelete,
+				Bucket: bucket,
+				ObjInfo: ObjectInfo{
+					Name: dobj.ObjectName,
+				},
+				ReqParams: map[string]string{
+					"sourceIPAddress": r.RemoteAddr,
+				},
+			})
+		}
+	}
 }
 
 // PutBucketHandler - PUT Bucket

cmd/server_test.go

@@ -309,6 +309,70 @@ func (s *TestSuiteCommon) TestDeleteBucketNotEmpty(c *C) {
 
 }
 
+func (s *TestSuiteCommon) TestDeleteMultipleObjects(c *C) {
+	// generate a random bucket name.
+	bucketName := getRandomBucketName()
+	// HTTP request to create the bucket.
+	request, err := newTestSignedRequest("PUT", getMakeBucketURL(s.endPoint, bucketName),
+		0, nil, s.accessKey, s.secretKey)
+	c.Assert(err, IsNil)
+
+	client := http.Client{}
+	// execute the request.
+	response, err := client.Do(request)
+	c.Assert(err, IsNil)
+	// assert the http response status code.
+	c.Assert(response.StatusCode, Equals, http.StatusOK)
+
+	objectName := "prefix/myobject"
+	delObjReq := DeleteObjectsRequest{
+		Quiet: false,
+	}
+	for i := 0; i < 10; i++ {
+		// Obtain http request to upload object.
+		// object Name contains a prefix.
+		objName := fmt.Sprintf("%d/%s", i, objectName)
+		request, err = newTestSignedRequest("PUT", getPutObjectURL(s.endPoint, bucketName, objName),
+			0, nil, s.accessKey, s.secretKey)
+		c.Assert(err, IsNil)
+
+		client = http.Client{}
+		// execute the http request.
+		response, err = client.Do(request)
+		c.Assert(err, IsNil)
+		// assert the status of http response.
+		c.Assert(response.StatusCode, Equals, http.StatusOK)
+		// Append all objects.
+		delObjReq.Objects = append(delObjReq.Objects, ObjectIdentifier{
+			ObjectName: objName,
+		})
+	}
+
+	// Marshal delete request.
+	deleteReqBytes, err := xml.Marshal(delObjReq)
+	c.Assert(err, IsNil)
+
+	// object name was "prefix/myobject", an attempt to delelte "prefix"
+	// Should not delete "prefix/myobject"
+	request, err = newTestSignedRequest("POST", getMultiDeleteObjectURL(s.endPoint, bucketName),
+		int64(len(deleteReqBytes)), bytes.NewReader(deleteReqBytes), s.accessKey, s.secretKey)
+	c.Assert(err, IsNil)
+	client = http.Client{}
+	response, err = client.Do(request)
+	c.Assert(err, IsNil)
+	c.Assert(response.StatusCode, Equals, http.StatusOK)
+
+	var deleteResp = DeleteObjectsResponse{}
+	delRespBytes, err := ioutil.ReadAll(response.Body)
+	c.Assert(err, IsNil)
+	err = xml.Unmarshal(delRespBytes, &deleteResp)
+	c.Assert(err, IsNil)
+	for i := 0; i < 10; i++ {
+		c.Assert(deleteResp.DeletedObjects[i], DeepEquals, delObjReq.Objects[i])
+	}
+	c.Assert(len(deleteResp.Errors), Equals, 0)
+}
+
 // Tests delete object responses and success.
 func (s *TestSuiteCommon) TestDeleteObject(c *C) {
 	// generate a random bucket name.

cmd/test-utils_test.go

@@ -623,6 +623,13 @@ func getDeleteObjectURL(endPoint, bucketName, objectName string) string {
 	return makeTestTargetURL(endPoint, bucketName, objectName, url.Values{})
 }
 
+// return URL for deleting multiple objects from a bucket.
+func getMultiDeleteObjectURL(endPoint, bucketName string) string {
+	queryValue := url.Values{}
+	queryValue.Set("delete", "")
+	return makeTestTargetURL(endPoint, bucketName, "", queryValue)
+}
+
 // return URL for HEAD on the object.
 func getHeadObjectURL(endPoint, bucketName, objectName string) string {
 	return makeTestTargetURL(endPoint, bucketName, objectName, url.Values{})