From aed24cf020bd11c3b20a7011b96c02e41894fa32 Mon Sep 17 00:00:00 2001
From: Wei-Ning Huang <w@dexon.org>
Date: Mon, 16 Jul 2018 00:12:17 +0800
Subject: Initial implementation of DEXON consensus algorithm

---
 simulation/validator.go | 139 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 139 insertions(+)
 create mode 100644 simulation/validator.go

(limited to 'simulation/validator.go')

diff --git a/simulation/validator.go b/simulation/validator.go
new file mode 100644
index 0000000..84e5e52
--- /dev/null
+++ b/simulation/validator.go
@@ -0,0 +1,139 @@
+// 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 (
+	"time"
+
+	"github.com/syndtr/goleveldb/leveldb"
+
+	"github.com/dexon-foundation/dexon-consensus-core/blockdb"
+	"github.com/dexon-foundation/dexon-consensus-core/common"
+	"github.com/dexon-foundation/dexon-consensus-core/core"
+	"github.com/dexon-foundation/dexon-consensus-core/core/types"
+	"github.com/dexon-foundation/dexon-consensus-core/simulation/config"
+)
+
+// Validator represents a validator in DexCon.
+type Validator struct {
+	network core.Network
+	app     *SimApp
+
+	config     config.Validator
+	db         *leveldb.DB
+	msgChannel chan interface{}
+
+	ID              types.ValidatorID
+	lattice         *core.BlockLattice
+	compactionChain *core.BlockChain
+
+	genesis *types.Block
+	current *types.Block
+}
+
+// NewValidator returns a new empty validator.
+func NewValidator(
+	id types.ValidatorID,
+	config config.Validator,
+	network core.Network,
+	db *leveldb.DB) *Validator {
+
+	hash := common.NewRandomHash()
+	genesis := &types.Block{
+		ProposerID: id,
+		ParentHash: hash,
+		Hash:       hash,
+		Height:     0,
+		Acks:       map[common.Hash]struct{}{},
+	}
+
+	app := NewSimApp(id)
+	lattice := core.NewBlockLattice(blockdb.NewMemBackedBlockDB(), network, app)
+
+	return &Validator{
+		ID:      id,
+		config:  config,
+		network: network,
+		app:     app,
+		db:      db,
+		lattice: lattice,
+		genesis: genesis,
+		current: genesis,
+	}
+}
+
+// GetID returns the ID of validator.
+func (v *Validator) GetID() types.ValidatorID {
+	return v.ID
+}
+
+// Bootstrap bootstraps a validator.
+func (v *Validator) Bootstrap(vs []*Validator) {
+	for _, x := range vs {
+		v.lattice.AddValidator(x.ID, x.genesis)
+	}
+	v.lattice.SetOwner(v.ID)
+}
+
+// Run starts the validator.
+func (v *Validator) Run() {
+	v.msgChannel = v.network.Join(v)
+
+	go v.MsgServer()
+	go v.BlockProposer()
+
+	// Blocks forever.
+	select {}
+}
+
+// MsgServer listen to the network channel for message and handle it.
+func (v *Validator) MsgServer() {
+	for {
+		msg := <-v.msgChannel
+
+		switch val := msg.(type) {
+		case *types.Block:
+			//if val.ProposerID.Equal(v.ID) {
+			//	continue
+			//}
+			v.lattice.ProcessBlock(val, true)
+		}
+	}
+}
+
+// BlockProposer propose blocks to be send to the DEXON network.
+func (v *Validator) BlockProposer() {
+	model := &NormalNetwork{
+		Sigma: v.config.ProposeIntervalSigma,
+		Mean:  v.config.ProposeIntervalMean,
+	}
+
+	for {
+		time.Sleep(model.Delay())
+
+		block := &types.Block{
+			ProposerID: v.ID,
+			ParentHash: v.current.Hash,
+			Hash:       common.NewRandomHash(),
+			Height:     0,
+			Acks:       map[common.Hash]struct{}{},
+		}
+		v.current = block
+		v.lattice.ProposeBlock(block)
+	}
+}
-- 
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