downloader: implemented new downloader

eth/downloader/downloader_test.go

@@ -0,0 +1,128 @@
+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(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) error {
+	dl.insertedBlocks += len(blocks)
+
+	if len(dl.blocks)-1 <= dl.insertedBlocks {
+		dl.done <- true
+	}
+
+	return 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.DeliverBlocks(id, blocks)
+
+		return nil
+	}
+}
+
+func (dl *downloadTester) newPeer(id string, td *big.Int, hash common.Hash) {
+	dl.pcount++
+
+	dl.downloader.RegisterPeer(id, td, 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, td, hash, dl.getHashes, func([]common.Hash) error {
+		return nil
+	})
+}
+
+func TestDownload(t *testing.T) {
+	glog.SetV(logger.Detail)
+	glog.SetToStderr(true)
+
+	hashes := createHashes(1000)
+	blocks := createBlocksFromHashes(hashes)
+	tester := newTester(t, hashes, blocks)
+
+	tester.newPeer("peer1", big.NewInt(10000), hashes[len(hashes)-1])
+	tester.newPeer("peer2", big.NewInt(0), common.Hash{})
+	tester.badBlocksPeer("peer3", big.NewInt(0), common.Hash{})
+	tester.badBlocksPeer("peer4", big.NewInt(0), common.Hash{})
+
+success:
+	select {
+	case <-tester.done:
+		break success
+	case <-time.After(10 * time.Second): // XXX this could actually fail on a slow computer
+		t.Error("timout")
+	}
+}