func (q *queuePoller) drainMessages(ctx context.Context) error {
service := sqs.New(q.cfg)
for {
select {
case <-ctx.Done():
return ctx.Err()
case <-q.closeSignal:
return nil
default:
}
msg := sqs.ReceiveMessageInput{
QueueUrl: &q.queueURL,
WaitTimeSeconds: &q.waitTimeSeconds,
}
if q.visibilityTimeout != 0 {
msg.VisibilityTimeout = &q.visibilityTimeout
}
resp, err := service.ReceiveMessage(&msg)
if err != nil {
return wraperr(err, "cannot receive messagges from queue")
}
if err := q.forwardMsgs(ctx, resp); err != nil {
return err
}
}
}
func (q *QueueInfo) ReceiveMessage(h ReceiveHandle) {
var input sqs.ReceiveMessageInput
input.QueueUrl = q.Queue
input.WaitTimeSeconds = &waitTime
input.MessageAttributeNames = []*string{&valueName}
input.MaxNumberOfMessages = &maxMsg
ro, _ := thisSQS.ReceiveMessage(&input)
l := len(ro.Messages)
if l > 0 {
needDele := set.New()
wg := new(sync.WaitGroup)
for i := 0; i < l; i++ {
msg := ro.Messages[i]
atts := msg.MessageAttributes
wg.Add(1)
go h(wg, atts["value"].BinaryValue, needDele, i)
}
wg.Wait()
indexes := set.IntSlice(needDele)
var entries []*sqs.DeleteMessageBatchRequestEntry
for _, index := range indexes {
msg := ro.Messages[index]
var entry sqs.DeleteMessageBatchRequestEntry
entry.Id = msg.MessageId
entry.ReceiptHandle = msg.ReceiptHandle
entries = append(entries, &entry)
}
q.deleteMessage(&entries)
}
q.ReceiveMessage(h)
}
// GetMessages returns the parsed messages from SQS if any. If an error
// occurs that error will be returned.
func (q *Queue) GetMessages(waitTimeout int64) ([]Message, error) {
params := sqs.ReceiveMessageInput{
QueueUrl: aws.String(q.URL),
}
if waitTimeout > 0 {
params.WaitTimeSeconds = aws.Int64(waitTimeout)
}
resp, err := q.Client.ReceiveMessage(¶ms)
if err != nil {
return nil, fmt.Errorf("failed to get messages, %v", err)
}
msgs := make([]Message, len(resp.Messages))
for i, msg := range resp.Messages {
parsedMsg := Message{}
if err := json.Unmarshal([]byte(aws.StringValue(msg.Body)), &parsedMsg); err != nil {
return nil, fmt.Errorf("failed to unmarshal message, %v", err)
}
msgs[i] = parsedMsg
}
return msgs, nil
}