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// Copyright 2018 The dexon-consensus-core Authors
// This file is part of the dexon-consensus-core library.
//
// The dexon-consensus-core 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 dexon-consensus-core 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 dexon-consensus-core library. If not, see
// <http://www.gnu.org/licenses/>.
package simulation
import (
"fmt"
"sort"
"time"
"github.com/dexon-foundation/dexon-consensus-core/common"
"github.com/dexon-foundation/dexon-consensus-core/core"
"github.com/dexon-foundation/dexon-consensus-core/core/blockdb"
"github.com/dexon-foundation/dexon-consensus-core/core/crypto"
"github.com/dexon-foundation/dexon-consensus-core/core/types"
"github.com/dexon-foundation/dexon-consensus-core/simulation/config"
)
// node represents a node in DexCon.
type node struct {
app *simApp
gov *simGovernance
db blockdb.BlockDatabase
config config.Node
netModule *network
ID types.NodeID
chainID uint64
prvKey crypto.PrivateKey
consensus *core.Consensus
}
// newNode returns a new empty node.
func newNode(
prvKey crypto.PrivateKey,
config config.Config) *node {
pubKey := prvKey.PublicKey()
netModule := newNetwork(pubKey, config.Networking)
id := types.NewNodeID(pubKey)
db, err := blockdb.NewMemBackedBlockDB(
id.String() + ".blockdb")
if err != nil {
panic(err)
}
gov := newSimGovernance(id, config.Node.Num, config.Node.Consensus)
return &node{
ID: id,
prvKey: prvKey,
config: config.Node,
app: newSimApp(id, netModule),
gov: gov,
db: db,
netModule: netModule,
}
}
// GetID returns the ID of node.
func (n *node) GetID() types.NodeID {
return n.ID
}
// run starts the node.
func (n *node) run(serverEndpoint interface{}, dMoment time.Time) {
// Run network.
if err := n.netModule.setup(serverEndpoint); err != nil {
panic(err)
}
msgChannel := n.netModule.receiveChanForNode()
peers := n.netModule.peers()
go n.netModule.run()
n.gov.setNetwork(n.netModule)
// Run consensus.
hashes := make(common.Hashes, 0, len(peers))
for _, pubKey := range peers {
nID := types.NewNodeID(pubKey)
n.gov.addNode(pubKey)
hashes = append(hashes, nID.Hash)
}
sort.Sort(hashes)
for i, hash := range hashes {
if hash == n.ID.Hash {
n.chainID = uint64(i)
break
}
}
n.consensus = core.NewConsensus(
dMoment, n.app, n.gov, n.db, n.netModule, n.prvKey)
go n.consensus.Run(dMoment)
// Blocks forever.
MainLoop:
for {
msg := <-msgChannel
switch val := msg.(type) {
case infoStatus:
if val == statusShutdown {
break MainLoop
}
case *types.DKGComplaint:
n.gov.AddDKGComplaint(val.Round, val)
case *types.DKGMasterPublicKey:
n.gov.AddDKGMasterPublicKey(val.Round, val)
case *types.DKGFinalize:
n.gov.AddDKGFinalize(val.Round, val)
default:
panic(fmt.Errorf("unexpected message from server: %v", val))
}
}
// Cleanup.
n.consensus.Stop()
if err := n.db.Close(); err != nil {
fmt.Println(err)
}
n.netModule.report(&message{
Type: shutdownAck,
})
// TODO(mission): once we have a way to know if consensus is stopped, stop
// the network module.
return
}
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