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package downloader
import (
"encoding/binary"
"math/big"
"testing"
"time"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/logger/glog"
)
var knownHash = common.Hash{1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}
func createHashes(start, amount int) (hashes []common.Hash) {
hashes = make([]common.Hash, amount+1)
hashes[len(hashes)-1] = knownHash
for i := range hashes[:len(hashes)-1] {
binary.BigEndian.PutUint64(hashes[i][:8], uint64(i+2))
}
return
}
func createBlocksFromHashes(hashes []common.Hash) map[common.Hash]*types.Block {
blocks := make(map[common.Hash]*types.Block)
for i, hash := range hashes {
header := &types.Header{Number: big.NewInt(int64(i))}
blocks[hash] = types.NewBlockWithHeader(header)
blocks[hash].HeaderHash = hash
}
return blocks
}
type downloadTester struct {
downloader *Downloader
hashes []common.Hash
blocks map[common.Hash]*types.Block
t *testing.T
pcount int
done chan bool
insertedBlocks int
}
func newTester(t *testing.T, hashes []common.Hash, blocks map[common.Hash]*types.Block) *downloadTester {
tester := &downloadTester{t: t, hashes: hashes, blocks: blocks, done: make(chan bool)}
downloader := New(tester.hasBlock, tester.insertChain)
tester.downloader = downloader
return tester
}
func (dl *downloadTester) hasBlock(hash common.Hash) bool {
if knownHash == hash {
return true
}
return false
}
func (dl *downloadTester) insertChain(blocks types.Blocks) (int, error) {
dl.insertedBlocks += len(blocks)
return 0, nil
}
func (dl *downloadTester) getHashes(hash common.Hash) error {
dl.downloader.hashCh <- dl.hashes
return nil
}
func (dl *downloadTester) getBlocks(id string) func([]common.Hash) error {
return func(hashes []common.Hash) error {
blocks := make([]*types.Block, len(hashes))
for i, hash := range hashes {
blocks[i] = dl.blocks[hash]
}
go dl.downloader.DeliverChunk(id, blocks)
return nil
}
}
func (dl *downloadTester) newPeer(id string, td *big.Int, hash common.Hash) {
dl.pcount++
dl.downloader.RegisterPeer(id, hash, dl.getHashes, dl.getBlocks(id))
}
func (dl *downloadTester) badBlocksPeer(id string, td *big.Int, hash common.Hash) {
dl.pcount++
// This bad peer never returns any blocks
dl.downloader.RegisterPeer(id, hash, dl.getHashes, func([]common.Hash) error {
return nil
})
}
func TestDownload(t *testing.T) {
glog.SetV(logger.Detail)
glog.SetToStderr(true)
minDesiredPeerCount = 4
blockTtl = 1 * time.Second
targetBlocks := 1000
hashes := createHashes(0, targetBlocks)
blocks := createBlocksFromHashes(hashes)
tester := newTester(t, hashes, blocks)
tester.newPeer("peer1", big.NewInt(10000), hashes[0])
tester.newPeer("peer2", big.NewInt(0), common.Hash{})
tester.badBlocksPeer("peer3", big.NewInt(0), common.Hash{})
tester.badBlocksPeer("peer4", big.NewInt(0), common.Hash{})
err := tester.downloader.Synchronise("peer1", hashes[0])
if err != nil {
t.Error("download error", err)
}
if tester.insertedBlocks != targetBlocks {
t.Error("expected", targetBlocks, "have", tester.insertedBlocks)
}
}
func TestMissing(t *testing.T) {
glog.SetV(logger.Detail)
glog.SetToStderr(true)
targetBlocks := 1000
hashes := createHashes(0, 1000)
extraHashes := createHashes(1001, 1003)
blocks := createBlocksFromHashes(append(extraHashes, hashes...))
tester := newTester(t, hashes, blocks)
tester.newPeer("peer1", big.NewInt(10000), hashes[len(hashes)-1])
hashes = append(extraHashes, hashes[:len(hashes)-1]...)
tester.newPeer("peer2", big.NewInt(0), common.Hash{})
err := tester.downloader.Synchronise("peer1", hashes[0])
if err != nil {
t.Error("download error", err)
}
if tester.insertedBlocks != targetBlocks {
t.Error("expected", targetBlocks, "have", tester.insertedBlocks)
}
}
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