SQS-service/app/gosqs/delete_message_batch.go

// Изменено: 2026-04-09
// DeleteMessageBatchV1 — пакетное удаление сообщений из очереди тенанта.
package gosqs

import (
	"net/http"
	"strings"

	"shared-sqs/app/interfaces"
	"shared-sqs/app/models"
	"shared-sqs/app/persistence"
	"shared-sqs/app/utils"

	"github.com/gorilla/mux"
	log "github.com/sirupsen/logrus"
)

func DeleteMessageBatchV1(req *http.Request) (int, interfaces.AbstractResponseBody) {
	requestBody := models.NewDeleteMessageBatchRequest()
	ok := utils.REQUEST_TRANSFORMER(requestBody, req, false)
	if !ok {
		log.Error("Invalid Request - DeleteMessageBatchV1")
		return utils.CreateErrorResponseV1("InvalidParameterValue", true)
	}

	t := getTenantFromContext(req)
	if t == nil {
		return utils.CreateErrorResponseV1("InvalidClientTokenId", true)
	}

	queueUrl := requestBody.QueueUrl
	queueName := ""
	if queueUrl == "" {
		vars := mux.Vars(req)
		queueName = vars["queueName"]
	} else {
		uriSegments := strings.Split(queueUrl, "/")
		queueName = uriSegments[len(uriSegments)-1]
	}

	key := tenantQueueKey(t.AccessKey, queueName)

	if len(requestBody.Entries) == 0 {
		return utils.CreateErrorResponseV1("EmptyBatchRequest", true)
	}

	if len(requestBody.Entries) > 10 {
		return utils.CreateErrorResponseV1("TooManyEntriesInBatchRequest", true)
	}

	ids := map[string]bool{}
	for _, v := range requestBody.Entries {
		if _, found := ids[v.Id]; found {
			return utils.CreateErrorResponseV1("BatchEntryIdsNotDistinct", true)
		}
		ids[v.Id] = true
	}

	queue := models.SyncQueues.GetLocked(key)
	if queue == nil {
		return utils.CreateErrorResponseV1("QueueNotFound", true)
	}
	defer queue.UnlockMu()

	deleteMessageMap := make(map[string]*deleteEntry)
	for _, entry := range requestBody.Entries {
		deleteMessageMap[entry.ReceiptHandle] = &deleteEntry{
			Id:            entry.Id,
			ReceiptHandle: entry.ReceiptHandle,
			Deleted:       false,
		}
	}

	deletedEntries := make([]models.DeleteMessageBatchResultEntry, 0)
	deletedUuids := make([]string, 0)

	// Идём по индексам, не пересобирая срез (P1.2): удаление = tombstone за O(1),
	// индексы не сдвигаются, поэтому итерация остаётся корректной.
	for i := range queue.Messages {
		if queue.IsDead(i) {
			continue
		}
		message := &queue.Messages[i]
		de, found := deleteMessageMap[message.ReceiptHandle]
		if !found {
			continue
		}
		log.Debugf("FIFO Queue %s unlocking group %s:", queueName, message.GroupID)
		// Читаем поля ДО RemoveIndex: компакция может перезаписать слот.
		groupID, dedupID, uuid := message.GroupID, message.DeduplicationID, message.Uuid
		queue.ClearInFlight(i, message.ReceiptHandle)
		queue.UnlockGroup(groupID)
		delete(queue.Duplicates, dedupID)
		de.Deleted = true
		deletedEntries = append(deletedEntries, models.DeleteMessageBatchResultEntry{Id: de.Id})
		deletedUuids = append(deletedUuids, uuid)
		queue.RemoveIndex(i)
	}
	// Удаляем сообщения из Redis отдельно — O(batch_size)
	persistence.DeleteMessagesPersist(key, deletedUuids)
	// Метаданные очереди (duplicates, FIFO state)
	persistence.SaveQueue(key, queue)

	notFoundEntries := make([]models.BatchResultErrorEntry, 0)
	for _, de := range deleteMessageMap {
		if !de.Deleted {
			notFoundEntries = append(notFoundEntries, models.BatchResultErrorEntry{
				Code:        "1",
				Id:          de.Id,
				Message:     "Message not found",
				SenderFault: true,
			})
		}
	}

	respStruct := models.DeleteMessageBatchResponse{
		Xmlns: models.BaseXmlns,
		Result: models.DeleteMessageBatchResult{
			Successful: deletedEntries,
			Failed:     notFoundEntries,
		},
		Metadata: models.BaseResponseMetadata,
	}

	return http.StatusOK, respStruct
}

type deleteEntry struct {
	Id            string
	ReceiptHandle string
	Error         string
	Deleted       bool
}