73 lines
2 KiB
Go
73 lines
2 KiB
Go
|
// Copyright 2012-2024 The NATS Authors
|
||
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
|
// you may not use this file except in compliance with the License.
|
||
|
|
// You may obtain a copy of the License at
|
||
|
|
//
|
||
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
||
|
|
//
|
||
|
|
// Unless required by applicable law or agreed to in writing, software
|
||
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
|
|
// See the License for the specific language governing permissions and
|
||
|
|
// limitations under the License.
|
||
|
|
|
||
|
|
//go:build go1.23
|
||
|
|
|
||
|
|
package nats
|
||
|
|
|
||
|
|
import (
|
||
|
|
"errors"
|
||
|
|
"iter"
|
||
|
|
"time"
|
||
|
|
)
|
||
|
|
|
||
|
|
// Msgs returns an iter.Seq2[*Msg, error] that can be used to iterate over
|
||
|
|
// messages. It can only be used with a subscription that has been created with
|
||
|
|
// SubscribeSync or QueueSubscribeSync, otherwise it will return an error on the
|
||
|
|
// first iteration.
|
||
|
|
//
|
||
|
|
// The iterator will block until a message is available. The
|
||
|
|
// subscription will not be closed when the iterator is done.
|
||
|
|
func (sub *Subscription) Msgs() iter.Seq2[*Msg, error] {
|
||
|
|
return func(yield func(*Msg, error) bool) {
|
||
|
|
for {
|
||
|
|
msg, err := sub.nextMsgNoTimeout()
|
||
|
|
if err != nil {
|
||
|
|
yield(nil, err)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
if !yield(msg, nil) {
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// MsgsTimeout returns an iter.Seq2[*Msg, error] that can be used to iterate
|
||
|
|
// over messages. It can only be used with a subscription that has been created
|
||
|
|
// with SubscribeSync or QueueSubscribeSync, otherwise it will return an error
|
||
|
|
// on the first iteration.
|
||
|
|
//
|
||
|
|
// The iterator will block until a message is available or the timeout is
|
||
|
|
// reached. If the timeout is reached, the iterator will return nats.ErrTimeout
|
||
|
|
// but it will not be closed.
|
||
|
|
func (sub *Subscription) MsgsTimeout(timeout time.Duration) iter.Seq2[*Msg, error] {
|
||
|
|
return func(yield func(*Msg, error) bool) {
|
||
|
|
for {
|
||
|
|
msg, err := sub.NextMsg(timeout)
|
||
|
|
if err != nil {
|
||
|
|
if !yield(nil, err) {
|
||
|
|
return
|
||
|
|
}
|
||
|
|
if !errors.Is(err, ErrTimeout) {
|
||
|
|
return
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if !yield(msg, nil) {
|
||
|
|
return
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|