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TATAUFO
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,133 @@ | ||
| // Copyright 2019 The PDU Authors | ||
| // This file is part of the PDU library. | ||
| // | ||
| // The PDU library is free software: you can redistribute it and/or modify | ||
| // it under the terms of the GNU Lesser General Public License as published by | ||
| // the Free Software Foundation, either version 3 of the License, or | ||
| // (at your option) any later version. | ||
| // | ||
| // The PDU library is distributed in the hope that it will be useful, | ||
| // but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| // GNU Lesser General Public License for more details. | ||
| // | ||
| // You should have received a copy of the GNU Lesser General Public License | ||
| // along with the PDU library. If not, see <http://www.gnu.org/licenses/>. | ||
|
|
||
| package node | ||
|
|
||
| import ( | ||
| "encoding/json" | ||
|
|
||
| "github.com/pdupub/go-pdu/common" | ||
| "github.com/pdupub/go-pdu/db" | ||
| "github.com/pdupub/go-pdu/galaxy" | ||
| ) | ||
|
|
||
| func (n *Node) askPeers(pid common.Hash) error { | ||
| p := n.peers[pid] | ||
| localPeerBytes, err := json.Marshal(n.localPeer()) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| waveID := common.CreateHash() | ||
| if err := p.SendQuestion(waveID, galaxy.CmdPeers, localPeerBytes); err != nil { | ||
| return err | ||
| } | ||
| if err := n.recordQuestion(pid, waveID); err != nil { | ||
| return err | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func (n *Node) askPing(pid common.Hash) error { | ||
| p := n.peers[pid] | ||
| // ping each of peer | ||
| waveID := common.CreateHash() | ||
| if err := p.SendPing(waveID); err != nil { | ||
| n.removePeer(pid) | ||
| return err | ||
| } | ||
| if err := n.recordPing(pid, waveID); err != nil { | ||
| return err | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func (n *Node) askRoots(pid common.Hash) error { | ||
| p := n.peers[pid] | ||
| waveID := common.CreateHash() | ||
| if err := p.SendQuestion(waveID, galaxy.CmdRoots); err != nil { | ||
| return err | ||
| } else { | ||
| if err := n.recordQuestion(pid, waveID); err != nil { | ||
| return err | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func (n *Node) askMsg(pid common.Hash) error { | ||
| p := n.peers[pid] | ||
| // get current last message | ||
| lastMsg, err := db.GetLastMsg(n.udb) | ||
| var lastMsgID common.Hash | ||
| if err != nil && err != db.ErrMessageNotFound { | ||
| return err | ||
| } | ||
| if lastMsg != nil { | ||
| lastMsgID = lastMsg.ID() | ||
| } | ||
|
|
||
| if lastMsg != nil && lastMsgID == n.lastSyncMsg { | ||
| return errNoNewMsgSync | ||
| } | ||
|
|
||
| waveID := common.CreateHash() | ||
| if err := p.SendQuestion(waveID, galaxy.CmdMessages, lastMsgID); err != nil { | ||
| return err | ||
| } | ||
| if err := n.recordQuestion(pid, waveID); err != nil { | ||
| return err | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func (n *Node) reAskMsg(waveID common.Hash) error { | ||
| if r, ok := n.questionRecord[waveID]; ok { | ||
| if left, ok := n.peerSyncCnt[r.pid]; ok && left > 0 { | ||
| n.peerSyncCnt[r.pid] = left - 1 | ||
| if err := n.askMsg(r.pid); err != nil { | ||
| n.peerSyncCnt[r.pid] = 0 | ||
| return err | ||
| } | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func (n *Node) delRecord(waveID common.Hash, cmd string) { | ||
| if cmd == galaxy.CmdPong { | ||
| delete(n.pingpongRecord, waveID) | ||
| } else { | ||
| delete(n.questionRecord, waveID) | ||
| } | ||
| } | ||
|
|
||
| func (n *Node) recordQuestion(peerID, waveID common.Hash) error { | ||
| if _, ok := n.questionRecord[waveID]; !ok { | ||
| n.questionRecord[waveID] = &Record{pid: peerID, delay: 0} | ||
| } else { | ||
| return errDuplicateWaveID | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func (n *Node) recordPing(peerID, waveID common.Hash) error { | ||
| if _, ok := n.pingpongRecord[waveID]; !ok { | ||
| n.pingpongRecord[waveID] = &Record{pid: peerID, delay: 0} | ||
| } else { | ||
| return errDuplicateWaveID | ||
| } | ||
| return nil | ||
| } |
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