110 lines
2.4 KiB
Go
110 lines
2.4 KiB
Go
/*
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* Copyright 2022 The Dragonfly Authors
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*
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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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*/
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package peer
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type pieceBroker struct {
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stopCh chan struct{}
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publishCh chan *PieceInfo
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subCh chan chan *PieceInfo
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unsubCh chan chan *PieceInfo
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}
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type PieceInfo struct {
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// Num is the current piece num
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Num int32
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// OrderedNum is the max pieces num with ordered, eg: 0 1 2 3 5 7 8, the OrderedNum is 3
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OrderedNum int32
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Finished bool
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}
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func newPieceBroker() *pieceBroker {
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return &pieceBroker{
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stopCh: make(chan struct{}),
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publishCh: make(chan *PieceInfo, 10),
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subCh: make(chan chan *PieceInfo),
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unsubCh: make(chan chan *PieceInfo),
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}
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}
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func (b *pieceBroker) Start() {
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var (
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orderedNum int32 = -1
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subs = map[chan *PieceInfo]struct{}{}
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pieces = map[int32]struct{}{}
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)
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for {
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select {
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case <-b.stopCh:
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//for msgCh := range subs {
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// close(msgCh)
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//}
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return
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case msgCh := <-b.subCh:
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subs[msgCh] = struct{}{}
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case msgCh := <-b.unsubCh:
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delete(subs, msgCh)
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case msg := <-b.publishCh:
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pieces[msg.Num] = struct{}{}
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if orderedNum+1 == msg.Num {
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orderedNum++
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// search cached pieces
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for {
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if _, ok := pieces[orderedNum+1]; ok {
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orderedNum++
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} else {
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break
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}
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}
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}
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msg.OrderedNum = orderedNum
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for msgCh := range subs {
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// msgCh is buffered, use non-blocking send to protect the broker
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select {
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case msgCh <- msg:
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default:
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}
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}
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}
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}
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}
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func (b *pieceBroker) Stop() {
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close(b.stopCh)
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}
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func (b *pieceBroker) Subscribe() chan *PieceInfo {
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msgCh := make(chan *PieceInfo, 5)
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select {
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case <-b.stopCh:
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case b.subCh <- msgCh:
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}
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return msgCh
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}
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func (b *pieceBroker) Unsubscribe(msgCh chan *PieceInfo) {
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b.unsubCh <- msgCh
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}
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func (b *pieceBroker) Publish(msg *PieceInfo) {
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select {
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case b.publishCh <- msg:
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case <-b.stopCh:
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}
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}
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