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p2p.go
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p2p.go
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// Copyright (c) 2021 PaddlePaddle Authors. All Rights Reserved.
// 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.
package p2p
import (
"errors"
"log"
"sync"
)
// State is the state of the P2P
type State uint8
const (
// NEW indicates that the P2P is new and ready for providing service
NEW State = iota
// CLOSED indicates that the P2P has been closed
CLOSED
)
// P2P defines p2p network
type P2P struct {
peers sync.Map // list of nodes, key is 'ip:port', and value is '*Peer'
state State // state of p2p network
wg sync.WaitGroup // for waiting all connections closed when get stop signal
}
// NewP2P creates P2P instance
func NewP2P(addrs ...string) *P2P {
p := &P2P{
state: NEW,
}
for _, a := range addrs {
p.peers.Store(a, newPeer(a))
}
return p
}
// Stop stops p2p, and closes all the grpc connection
func (p *P2P) Stop() {
// change state
p.state = CLOSED
// waiting for all peer getting free
log.Println("Start to shut down P2P, please wait...")
p.wg.Wait()
// close all connection
p.peers.Range(func(k, v interface{}) bool {
v.(*Peer).closeConn()
return true
})
}
// GetPeer gets an available peer
func (p *P2P) GetPeer(address string) (*Peer, error) {
if p.state == CLOSED {
return nil, errors.New("service closed")
}
peer := p.getPeerNotExist(address)
p.wg.Add(1)
return peer, nil
}
// getPeerNotExist gets an available peer, creates one if peer does not exist
func (p *P2P) getPeerNotExist(address string) *Peer {
peer, _ := p.peers.LoadOrStore(address, newPeer(address))
return peer.(*Peer)
}
// FreePeer frees a peer
func (p *P2P) FreePeer() {
p.wg.Done()
}