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