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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 core
import (
"math/rand"
"testing"
"time"
"github.com/dexon-foundation/dexon-consensus-core/core/blockdb"
"github.com/dexon-foundation/dexon-consensus-core/core/crypto/ecdsa"
"github.com/dexon-foundation/dexon-consensus-core/core/test"
"github.com/dexon-foundation/dexon-consensus-core/core/types"
"github.com/stretchr/testify/suite"
)
// testShardMgr wraps compaction chain and shard.
type testShardMgr struct {
shard *Shard
ccModule *compactionChain
app *test.App
db blockdb.BlockDatabase
}
func (mgr *testShardMgr) prepareBlock(
chainID uint32) (b *types.Block, err error) {
b = &types.Block{
Position: types.Position{
ChainID: chainID,
}}
err = mgr.shard.PrepareBlock(b, time.Now().UTC())
return
}
// Process describes the usage of Shard.ProcessBlock.
func (mgr *testShardMgr) processBlock(b *types.Block) (err error) {
var (
delivered []*types.Block
verified []*types.Block
pendings = []*types.Block{b}
)
if err = mgr.shard.SanityCheck(b); err != nil {
if err == ErrAckingBlockNotExists {
err = nil
}
return
}
for {
if len(pendings) == 0 {
break
}
b, pendings = pendings[0], pendings[1:]
if verified, delivered, err = mgr.shard.ProcessBlock(b); err != nil {
return
}
// Deliver blocks.
for _, b = range delivered {
if err = mgr.ccModule.processBlock(b); err != nil {
return
}
if err = mgr.db.Update(*b); err != nil {
return
}
mgr.app.BlockDelivered(*b)
}
// Update pending blocks for verified block (pass sanity check).
pendings = append(pendings, verified...)
}
return
}
type ShardTestSuite struct {
suite.Suite
}
func (s *ShardTestSuite) newTestShardMgr(cfg *types.Config) *testShardMgr {
var req = s.Require()
// Setup private key.
prvKey, err := ecdsa.NewPrivateKey()
req.Nil(err)
// Setup blockdb.
db, err := blockdb.NewMemBackedBlockDB()
req.Nil(err)
// Setup application.
app := test.NewApp()
// Setup shard.
return &testShardMgr{
ccModule: newCompactionChain(db),
app: app,
db: db,
shard: NewShard(
uint32(0),
cfg,
NewAuthenticator(prvKey),
app,
app,
db)}
}
func (s *ShardTestSuite) TestBasicUsage() {
// One shard prepare blocks on chains randomly selected each time
// and process it. Those generated blocks and kept into a buffer, and
// process by other shard instances with random order.
var (
blockNum = 100
chainNum = uint32(19)
otherShardNum = 20
req = s.Require()
err error
cfg = types.Config{
NumChains: chainNum,
PhiRatio: float32(2) / float32(3),
K: 0,
}
master = s.newTestShardMgr(&cfg)
apps = []*test.App{master.app}
revealSeq = map[string]struct{}{}
)
// Master-shard generates blocks.
for i := uint32(0); i < chainNum; i++ {
// Produce genesis blocks should be delivered before all other blocks,
// or the consensus time would be wrong.
b, err := master.prepareBlock(i)
req.NotNil(b)
req.Nil(err)
// We've ignored the error for "acking blocks don't exist".
req.Nil(master.processBlock(b))
}
for i := 0; i < (blockNum - int(chainNum)); i++ {
b, err := master.prepareBlock(uint32(rand.Intn(int(chainNum))))
req.NotNil(b)
req.Nil(err)
// We've ignored the error for "acking blocks don't exist".
req.Nil(master.processBlock(b))
}
// Now we have some blocks, replay them on different shards.
iter, err := master.db.GetAll()
req.Nil(err)
revealer, err := test.NewRandomRevealer(iter)
req.Nil(err)
for i := 0; i < otherShardNum; i++ {
revealer.Reset()
revealed := ""
other := s.newTestShardMgr(&cfg)
for {
b, err := revealer.Next()
if err != nil {
if err == blockdb.ErrIterationFinished {
err = nil
break
}
}
req.Nil(err)
req.Nil(other.processBlock(&b))
revealed += b.Hash.String() + ","
revealSeq[revealed] = struct{}{}
}
apps = append(apps, other.app)
}
// Make sure not only one revealing sequence.
req.True(len(revealSeq) > 1)
// Make sure nothing goes wrong.
for i, app := range apps {
req.Nil(app.Verify())
for j, otherApp := range apps {
if i >= j {
continue
}
req.Nil(app.Compare(otherApp))
}
}
}
func TestShard(t *testing.T) {
suite.Run(t, new(ShardTestSuite))
}
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