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// Copyright 2018 The dexon-consensus Authors
// This file is part of the dexon-consensus library.
//
// The dexon-consensus 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 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 library. If not, see
// <http://www.gnu.org/licenses/>.
package test
import (
"sync"
"github.com/dexon-foundation/dexon-consensus/core/blockdb"
"github.com/dexon-foundation/dexon-consensus/core/types"
)
// StopByConfirmedBlocks would make sure each nodes confirms
// at least X blocks proposed by itself.
type StopByConfirmedBlocks struct {
apps map[types.NodeID]*App
dbs map[types.NodeID]blockdb.BlockDatabase
lastCheckDelivered map[types.NodeID]int
confirmedBlocks map[types.NodeID]int
blockCount int
lock sync.Mutex
}
// NewStopByConfirmedBlocks construct an StopByConfirmedBlocks instance.
func NewStopByConfirmedBlocks(
blockCount int,
apps map[types.NodeID]*App,
dbs map[types.NodeID]blockdb.BlockDatabase) *StopByConfirmedBlocks {
confirmedBlocks := make(map[types.NodeID]int)
for nID := range apps {
confirmedBlocks[nID] = 0
}
return &StopByConfirmedBlocks{
apps: apps,
dbs: dbs,
lastCheckDelivered: make(map[types.NodeID]int),
confirmedBlocks: confirmedBlocks,
blockCount: blockCount,
}
}
// ShouldStop implements Stopper interface.
func (s *StopByConfirmedBlocks) ShouldStop(nID types.NodeID) bool {
s.lock.Lock()
defer s.lock.Unlock()
// Accumulate confirmed blocks proposed by this node in this round.
lastChecked := s.lastCheckDelivered[nID]
currentConfirmedBlocks := s.confirmedBlocks[nID]
db := s.dbs[nID]
s.apps[nID].Check(func(app *App) {
for _, h := range app.DeliverSequence[lastChecked:] {
b, err := db.Get(h)
if err != nil {
panic(err)
}
if b.ProposerID == nID {
currentConfirmedBlocks++
}
}
s.lastCheckDelivered[nID] = len(app.DeliverSequence)
})
s.confirmedBlocks[nID] = currentConfirmedBlocks
// Check if all nodes confirmed at least 'blockCount' blocks.
for _, v := range s.confirmedBlocks {
if v < s.blockCount {
return false
}
}
return true
}
// StopByRound would make sure at least one block at round R is delivered
// at each node.
type StopByRound struct {
untilRound uint64
currentRounds map[types.NodeID]uint64
lastCheckDelivered map[types.NodeID]int
apps map[types.NodeID]*App
dbs map[types.NodeID]blockdb.BlockDatabase
lock sync.Mutex
}
// NewStopByRound constructs an StopByRound instance.
func NewStopByRound(
round uint64,
apps map[types.NodeID]*App,
dbs map[types.NodeID]blockdb.BlockDatabase) *StopByRound {
return &StopByRound{
untilRound: round,
currentRounds: make(map[types.NodeID]uint64),
lastCheckDelivered: make(map[types.NodeID]int),
apps: apps,
dbs: dbs,
}
}
// ShouldStop implements Stopper interface.
func (s *StopByRound) ShouldStop(nID types.NodeID) bool {
s.lock.Lock()
defer s.lock.Unlock()
// Cache latest round of this node.
if curRound := s.currentRounds[nID]; curRound < s.untilRound {
lastChecked := s.lastCheckDelivered[nID]
db := s.dbs[nID]
s.apps[nID].Check(func(app *App) {
for _, h := range app.DeliverSequence[lastChecked:] {
b, err := db.Get(h)
if err != nil {
panic(err)
}
if b.Position.Round > curRound {
curRound = b.Position.Round
}
}
s.lastCheckDelivered[nID] = len(app.DeliverSequence)
s.currentRounds[nID] = curRound
})
}
// Check if latest round on each node is later than untilRound.
for _, round := range s.currentRounds {
if round < s.untilRound {
return false
}
}
return true
}
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