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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 integration
import (
"fmt"
"time"
"github.com/dexon-foundation/dexon-consensus-core/blockdb"
"github.com/dexon-foundation/dexon-consensus-core/core"
"github.com/dexon-foundation/dexon-consensus-core/core/test"
"github.com/dexon-foundation/dexon-consensus-core/core/types"
"github.com/dexon-foundation/dexon-consensus-core/crypto"
"github.com/dexon-foundation/dexon-consensus-core/crypto/eth"
)
type consensusEventType int
const (
evtProposeBlock consensusEventType = iota
evtReceiveBlock
)
type consensusEventPayload struct {
Type consensusEventType
PiggyBack interface{}
}
// NewProposeBlockEvent constructs an test.Event that would trigger
// block proposing.
func NewProposeBlockEvent(vID types.ValidatorID, when time.Time) *test.Event {
return test.NewEvent(vID, when, &consensusEventPayload{
Type: evtProposeBlock,
})
}
// NewReceiveBlockEvent constructs an test.Event that would trigger
// block received.
func NewReceiveBlockEvent(
vID types.ValidatorID, when time.Time, block *types.Block) *test.Event {
return test.NewEvent(vID, when, &consensusEventPayload{
Type: evtReceiveBlock,
PiggyBack: block,
})
}
// Validator is designed to work with test.Scheduler.
type Validator struct {
ID types.ValidatorID
cons *core.Consensus
gov core.Governance
networkLatency LatencyModel
proposingLatency LatencyModel
}
// NewValidator constructs an instance of Validator.
func NewValidator(
app core.Application,
gov core.Governance,
db blockdb.BlockDatabase,
privateKey crypto.PrivateKey,
vID types.ValidatorID,
networkLatency LatencyModel,
proposingLatency LatencyModel) *Validator {
return &Validator{
ID: vID,
gov: gov,
networkLatency: networkLatency,
proposingLatency: proposingLatency,
cons: core.NewConsensus(
app, gov, db, privateKey, eth.SigToPub),
}
}
// Handle implements test.EventHandler interface.
func (v *Validator) Handle(e *test.Event) (events []*test.Event) {
payload := e.Payload.(*consensusEventPayload)
switch payload.Type {
case evtProposeBlock:
events, e.ExecError = v.handleProposeBlock(e.Time, payload.PiggyBack)
case evtReceiveBlock:
events, e.ExecError = v.handleReceiveBlock(payload.PiggyBack)
default:
panic(fmt.Errorf("unknown consensus event type: %v", payload.Type))
}
return
}
func (v *Validator) handleProposeBlock(when time.Time, piggyback interface{}) (
events []*test.Event, err error) {
b := &types.Block{ProposerID: v.ID}
if err = v.cons.PrepareBlock(b, when); err != nil {
return
}
if err = v.cons.ProcessBlock(b); err != nil {
return
}
// Create 'block received' event for each other validators.
for vID := range v.gov.GetValidatorSet() {
if vID == v.ID {
continue
}
events = append(events, NewReceiveBlockEvent(
vID, when.Add(v.networkLatency.Delay()), b.Clone()))
}
// Create next 'block proposing' event for this validators.
events = append(events, NewProposeBlockEvent(
v.ID, when.Add(v.proposingLatency.Delay())))
return
}
func (v *Validator) handleReceiveBlock(piggyback interface{}) (
events []*test.Event, err error) {
err = v.cons.ProcessBlock(piggyback.(*types.Block))
if err != nil {
panic(err)
}
return
}
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