mirror of
https://gitlab.com/pulsechaincom/erigon-pulse.git
synced 2024-12-25 13:07:17 +00:00
748 lines
27 KiB
Go
748 lines
27 KiB
Go
package downloader
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import (
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"encoding/binary"
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"errors"
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"fmt"
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"math/big"
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"sync/atomic"
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"testing"
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"time"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/core"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/event"
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)
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var (
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knownHash = common.Hash{1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}
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unknownHash = common.Hash{2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2}
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bannedHash = common.Hash{3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3}
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genesis = createBlock(1, common.Hash{}, knownHash)
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)
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// idCounter is used by the createHashes method the generate deterministic but unique hashes
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var idCounter = int64(2) // #1 is the genesis block
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// createHashes generates a batch of hashes rooted at a specific point in the chain.
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func createHashes(amount int, root common.Hash) (hashes []common.Hash) {
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hashes = make([]common.Hash, amount+1)
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hashes[len(hashes)-1] = root
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for i := 0; i < len(hashes)-1; i++ {
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binary.BigEndian.PutUint64(hashes[i][:8], uint64(idCounter))
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idCounter++
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}
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return
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}
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// createBlock assembles a new block at the given chain height.
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func createBlock(i int, parent, hash common.Hash) *types.Block {
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header := &types.Header{Number: big.NewInt(int64(i))}
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block := types.NewBlockWithHeader(header)
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block.HeaderHash = hash
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block.ParentHeaderHash = parent
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return block
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}
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// copyBlock makes a deep copy of a block suitable for local modifications.
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func copyBlock(block *types.Block) *types.Block {
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return createBlock(int(block.Number().Int64()), block.ParentHeaderHash, block.HeaderHash)
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}
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func createBlocksFromHashes(hashes []common.Hash) map[common.Hash]*types.Block {
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blocks := make(map[common.Hash]*types.Block)
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for i := 0; i < len(hashes); i++ {
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parent := knownHash
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if i < len(hashes)-1 {
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parent = hashes[i+1]
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}
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blocks[hashes[i]] = createBlock(len(hashes)-i, parent, hashes[i])
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}
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return blocks
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}
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type downloadTester struct {
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downloader *Downloader
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ownHashes []common.Hash // Hash chain belonging to the tester
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ownBlocks map[common.Hash]*types.Block // Blocks belonging to the tester
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peerHashes map[string][]common.Hash // Hash chain belonging to different test peers
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peerBlocks map[string]map[common.Hash]*types.Block // Blocks belonging to different test peers
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maxHashFetch int // Overrides the maximum number of retrieved hashes
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}
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func newTester() *downloadTester {
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tester := &downloadTester{
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ownHashes: []common.Hash{knownHash},
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ownBlocks: map[common.Hash]*types.Block{knownHash: genesis},
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peerHashes: make(map[string][]common.Hash),
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peerBlocks: make(map[string]map[common.Hash]*types.Block),
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}
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var mux event.TypeMux
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downloader := New(&mux, tester.hasBlock, tester.getBlock, tester.insertChain, tester.dropPeer)
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tester.downloader = downloader
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return tester
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}
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// sync starts synchronizing with a remote peer, blocking until it completes.
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func (dl *downloadTester) sync(id string) error {
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err := dl.downloader.synchronise(id, dl.peerHashes[id][0])
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for atomic.LoadInt32(&dl.downloader.processing) == 1 {
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time.Sleep(time.Millisecond)
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}
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return err
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}
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// hasBlock checks if a block is pres ent in the testers canonical chain.
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func (dl *downloadTester) hasBlock(hash common.Hash) bool {
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return dl.getBlock(hash) != nil
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}
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// getBlock retrieves a block from the testers canonical chain.
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func (dl *downloadTester) getBlock(hash common.Hash) *types.Block {
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return dl.ownBlocks[hash]
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}
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// insertChain injects a new batch of blocks into the simulated chain.
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func (dl *downloadTester) insertChain(blocks types.Blocks) (int, error) {
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for i, block := range blocks {
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if _, ok := dl.ownBlocks[block.ParentHash()]; !ok {
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return i, errors.New("unknown parent")
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}
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dl.ownHashes = append(dl.ownHashes, block.Hash())
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dl.ownBlocks[block.Hash()] = block
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}
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return len(blocks), nil
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}
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// newPeer registers a new block download source into the downloader.
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func (dl *downloadTester) newPeer(id string, hashes []common.Hash, blocks map[common.Hash]*types.Block) error {
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err := dl.downloader.RegisterPeer(id, hashes[0], dl.peerGetHashesFn(id), dl.peerGetBlocksFn(id))
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if err == nil {
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// Assign the owned hashes and blocks to the peer (deep copy)
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dl.peerHashes[id] = make([]common.Hash, len(hashes))
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copy(dl.peerHashes[id], hashes)
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dl.peerBlocks[id] = make(map[common.Hash]*types.Block)
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for hash, block := range blocks {
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dl.peerBlocks[id][hash] = copyBlock(block)
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}
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}
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return err
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}
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// dropPeer simulates a hard peer removal from the connection pool.
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func (dl *downloadTester) dropPeer(id string) {
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delete(dl.peerHashes, id)
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delete(dl.peerBlocks, id)
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dl.downloader.UnregisterPeer(id)
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}
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// peerGetBlocksFn constructs a getHashes function associated with a particular
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// peer in the download tester. The returned function can be used to retrieve
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// batches of hashes from the particularly requested peer.
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func (dl *downloadTester) peerGetHashesFn(id string) func(head common.Hash) error {
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return func(head common.Hash) error {
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limit := MaxHashFetch
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if dl.maxHashFetch > 0 {
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limit = dl.maxHashFetch
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}
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// Gather the next batch of hashes
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hashes := dl.peerHashes[id]
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result := make([]common.Hash, 0, limit)
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for i, hash := range hashes {
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if hash == head {
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i++
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for len(result) < cap(result) && i < len(hashes) {
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result = append(result, hashes[i])
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i++
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}
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break
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}
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}
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// Delay delivery a bit to allow attacks to unfold
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go func() {
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time.Sleep(time.Millisecond)
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dl.downloader.DeliverHashes(id, result)
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}()
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return nil
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}
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}
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// peerGetBlocksFn constructs a getBlocks function associated with a particular
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// peer in the download tester. The returned function can be used to retrieve
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// batches of blocks from the particularly requested peer.
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func (dl *downloadTester) peerGetBlocksFn(id string) func([]common.Hash) error {
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return func(hashes []common.Hash) error {
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blocks := dl.peerBlocks[id]
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result := make([]*types.Block, 0, len(hashes))
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for _, hash := range hashes {
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if block, ok := blocks[hash]; ok {
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result = append(result, block)
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}
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}
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go dl.downloader.DeliverBlocks(id, result)
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return nil
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}
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}
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// Tests that simple synchronization, without throttling from a good peer works.
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func TestSynchronisation(t *testing.T) {
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// Create a small enough block chain to download and the tester
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targetBlocks := blockCacheLimit - 15
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hashes := createHashes(targetBlocks, knownHash)
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blocks := createBlocksFromHashes(hashes)
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tester := newTester()
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tester.newPeer("peer", hashes, blocks)
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// Synchronise with the peer and make sure all blocks were retrieved
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if err := tester.sync("peer"); err != nil {
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t.Fatalf("failed to synchronise blocks: %v", err)
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}
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if imported := len(tester.ownBlocks); imported != targetBlocks+1 {
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t.Fatalf("synchronised block mismatch: have %v, want %v", imported, targetBlocks+1)
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}
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}
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// Tests that an inactive downloader will not accept incoming hashes and blocks.
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func TestInactiveDownloader(t *testing.T) {
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tester := newTester()
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// Check that neither hashes nor blocks are accepted
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if err := tester.downloader.DeliverHashes("bad peer", []common.Hash{}); err != errNoSyncActive {
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t.Errorf("error mismatch: have %v, want %v", err, errNoSyncActive)
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}
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if err := tester.downloader.DeliverBlocks("bad peer", []*types.Block{}); err != errNoSyncActive {
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t.Errorf("error mismatch: have %v, want %v", err, errNoSyncActive)
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}
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}
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// Tests that a canceled download wipes all previously accumulated state.
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func TestCancel(t *testing.T) {
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// Create a small enough block chain to download and the tester
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targetBlocks := blockCacheLimit - 15
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hashes := createHashes(targetBlocks, knownHash)
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blocks := createBlocksFromHashes(hashes)
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tester := newTester()
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tester.newPeer("peer", hashes, blocks)
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// Make sure canceling works with a pristine downloader
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tester.downloader.Cancel()
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hashCount, blockCount := tester.downloader.queue.Size()
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if hashCount > 0 || blockCount > 0 {
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t.Errorf("block or hash count mismatch: %d hashes, %d blocks, want 0", hashCount, blockCount)
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}
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// Synchronise with the peer, but cancel afterwards
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if err := tester.sync("peer"); err != nil {
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t.Fatalf("failed to synchronise blocks: %v", err)
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}
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tester.downloader.Cancel()
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hashCount, blockCount = tester.downloader.queue.Size()
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if hashCount > 0 || blockCount > 0 {
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t.Errorf("block or hash count mismatch: %d hashes, %d blocks, want 0", hashCount, blockCount)
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}
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}
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// Tests that if a large batch of blocks are being downloaded, it is throttled
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// until the cached blocks are retrieved.
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func TestThrottling(t *testing.T) {
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// Create a long block chain to download and the tester
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targetBlocks := 8 * blockCacheLimit
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hashes := createHashes(targetBlocks, knownHash)
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blocks := createBlocksFromHashes(hashes)
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tester := newTester()
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tester.newPeer("peer", hashes, blocks)
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// Wrap the importer to allow stepping
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done := make(chan int)
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tester.downloader.insertChain = func(blocks types.Blocks) (int, error) {
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n, err := tester.insertChain(blocks)
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done <- n
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return n, err
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}
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// Start a synchronisation concurrently
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errc := make(chan error)
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go func() {
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errc <- tester.sync("peer")
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}()
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// Iteratively take some blocks, always checking the retrieval count
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for len(tester.ownBlocks) < targetBlocks+1 {
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// Wait a bit for sync to throttle itself
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var cached int
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for start := time.Now(); time.Since(start) < 3*time.Second; {
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time.Sleep(25 * time.Millisecond)
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cached = len(tester.downloader.queue.blockPool)
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if cached == blockCacheLimit || len(tester.ownBlocks)+cached == targetBlocks+1 {
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break
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}
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}
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// Make sure we filled up the cache, then exhaust it
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time.Sleep(25 * time.Millisecond) // give it a chance to screw up
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if cached != blockCacheLimit && len(tester.ownBlocks)+cached < targetBlocks+1 {
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t.Fatalf("block count mismatch: have %v, want %v", cached, blockCacheLimit)
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}
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<-done // finish previous blocking import
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for cached > maxBlockProcess {
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cached -= <-done
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}
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time.Sleep(25 * time.Millisecond) // yield to the insertion
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}
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<-done // finish the last blocking import
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// Check that we haven't pulled more blocks than available
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if len(tester.ownBlocks) > targetBlocks+1 {
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t.Fatalf("target block count mismatch: have %v, want %v", len(tester.ownBlocks), targetBlocks+1)
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}
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if err := <-errc; err != nil {
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t.Fatalf("block synchronization failed: %v", err)
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}
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}
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// Tests that synchronisation from multiple peers works as intended (multi thread sanity test).
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func TestMultiSynchronisation(t *testing.T) {
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// Create various peers with various parts of the chain
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targetPeers := 16
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targetBlocks := targetPeers*blockCacheLimit - 15
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hashes := createHashes(targetBlocks, knownHash)
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blocks := createBlocksFromHashes(hashes)
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tester := newTester()
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for i := 0; i < targetPeers; i++ {
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id := fmt.Sprintf("peer #%d", i)
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tester.newPeer(id, hashes[i*blockCacheLimit:], blocks)
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}
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// Synchronise with the middle peer and make sure half of the blocks were retrieved
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id := fmt.Sprintf("peer #%d", targetPeers/2)
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if err := tester.sync(id); err != nil {
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t.Fatalf("failed to synchronise blocks: %v", err)
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}
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if imported := len(tester.ownBlocks); imported != len(tester.peerHashes[id]) {
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t.Fatalf("synchronised block mismatch: have %v, want %v", imported, len(tester.peerHashes[id]))
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}
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// Synchronise with the best peer and make sure everything is retrieved
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if err := tester.sync("peer #0"); err != nil {
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t.Fatalf("failed to synchronise blocks: %v", err)
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}
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if imported := len(tester.ownBlocks); imported != targetBlocks+1 {
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t.Fatalf("synchronised block mismatch: have %v, want %v", imported, targetBlocks+1)
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}
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}
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// Tests that if a peer returns an invalid chain with a block pointing to a non-
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// existing parent, it is correctly detected and handled.
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func TestNonExistingParentAttack(t *testing.T) {
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tester := newTester()
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// Forge a single-link chain with a forged header
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hashes := createHashes(1, knownHash)
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blocks := createBlocksFromHashes(hashes)
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tester.newPeer("valid", hashes, blocks)
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hashes = createHashes(1, knownHash)
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blocks = createBlocksFromHashes(hashes)
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blocks[hashes[0]].ParentHeaderHash = unknownHash
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tester.newPeer("attack", hashes, blocks)
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// Try and sync with the malicious node and check that it fails
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if err := tester.sync("attack"); err == nil {
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t.Fatalf("block synchronization succeeded")
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}
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if tester.hasBlock(hashes[0]) {
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t.Fatalf("tester accepted unknown-parent block: %v", blocks[hashes[0]])
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}
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// Try to synchronize with the valid chain and make sure it succeeds
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if err := tester.sync("valid"); err != nil {
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t.Fatalf("failed to synchronise blocks: %v", err)
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}
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if !tester.hasBlock(tester.peerHashes["valid"][0]) {
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t.Fatalf("tester didn't accept known-parent block: %v", tester.peerBlocks["valid"][hashes[0]])
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}
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}
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// Tests that if a malicious peers keeps sending us repeating hashes, we don't
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// loop indefinitely.
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func TestRepeatingHashAttack(t *testing.T) { // TODO: Is this thing valid??
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tester := newTester()
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// Create a valid chain, but drop the last link
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hashes := createHashes(blockCacheLimit, knownHash)
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blocks := createBlocksFromHashes(hashes)
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tester.newPeer("valid", hashes, blocks)
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tester.newPeer("attack", hashes[:len(hashes)-1], blocks)
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// Try and sync with the malicious node
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errc := make(chan error)
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go func() {
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errc <- tester.sync("attack")
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}()
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// Make sure that syncing returns and does so with a failure
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select {
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case <-time.After(time.Second):
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t.Fatalf("synchronisation blocked")
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case err := <-errc:
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if err == nil {
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t.Fatalf("synchronisation succeeded")
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}
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}
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// Ensure that a valid chain can still pass sync
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if err := tester.sync("valid"); err != nil {
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t.Fatalf("failed to synchronise blocks: %v", err)
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}
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}
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// Tests that if a malicious peers returns a non-existent block hash, it should
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// eventually time out and the sync reattempted.
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func TestNonExistingBlockAttack(t *testing.T) {
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tester := newTester()
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// Create a valid chain, but forge the last link
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hashes := createHashes(blockCacheLimit, knownHash)
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blocks := createBlocksFromHashes(hashes)
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tester.newPeer("valid", hashes, blocks)
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hashes[len(hashes)/2] = unknownHash
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tester.newPeer("attack", hashes, blocks)
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// Try and sync with the malicious node and check that it fails
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if err := tester.sync("attack"); err != errPeersUnavailable {
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t.Fatalf("synchronisation error mismatch: have %v, want %v", err, errPeersUnavailable)
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}
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// Ensure that a valid chain can still pass sync
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if err := tester.sync("valid"); err != nil {
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t.Fatalf("failed to synchronise blocks: %v", err)
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}
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}
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// Tests that if a malicious peer is returning hashes in a weird order, that the
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// sync throttler doesn't choke on them waiting for the valid blocks.
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func TestInvalidHashOrderAttack(t *testing.T) {
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tester := newTester()
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// Create a valid long chain, but reverse some hashes within
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hashes := createHashes(4*blockCacheLimit, knownHash)
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blocks := createBlocksFromHashes(hashes)
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tester.newPeer("valid", hashes, blocks)
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chunk1 := make([]common.Hash, blockCacheLimit)
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chunk2 := make([]common.Hash, blockCacheLimit)
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copy(chunk1, hashes[blockCacheLimit:2*blockCacheLimit])
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copy(chunk2, hashes[2*blockCacheLimit:3*blockCacheLimit])
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copy(hashes[2*blockCacheLimit:], chunk1)
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copy(hashes[blockCacheLimit:], chunk2)
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tester.newPeer("attack", hashes, blocks)
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// Try and sync with the malicious node and check that it fails
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if err := tester.sync("attack"); err != errInvalidChain {
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t.Fatalf("synchronisation error mismatch: have %v, want %v", err, errInvalidChain)
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}
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// Ensure that a valid chain can still pass sync
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if err := tester.sync("valid"); err != nil {
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t.Fatalf("failed to synchronise blocks: %v", err)
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}
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}
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// Tests that if a malicious peer makes up a random hash chain and tries to push
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// indefinitely, it actually gets caught with it.
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func TestMadeupHashChainAttack(t *testing.T) {
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tester := newTester()
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blockSoftTTL = 100 * time.Millisecond
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crossCheckCycle = 25 * time.Millisecond
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// Create a long chain of hashes without backing blocks
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|
hashes := createHashes(4*blockCacheLimit, knownHash)
|
|
blocks := createBlocksFromHashes(hashes)
|
|
|
|
tester.newPeer("valid", hashes, blocks)
|
|
tester.newPeer("attack", createHashes(1024*blockCacheLimit, knownHash), nil)
|
|
|
|
// Try and sync with the malicious node and check that it fails
|
|
if err := tester.sync("attack"); err != errCrossCheckFailed {
|
|
t.Fatalf("synchronisation error mismatch: have %v, want %v", err, errCrossCheckFailed)
|
|
}
|
|
// Ensure that a valid chain can still pass sync
|
|
if err := tester.sync("valid"); err != nil {
|
|
t.Fatalf("failed to synchronise blocks: %v", err)
|
|
}
|
|
}
|
|
|
|
// Tests that if a malicious peer makes up a random hash chain, and tries to push
|
|
// indefinitely, one hash at a time, it actually gets caught with it. The reason
|
|
// this is separate from the classical made up chain attack is that sending hashes
|
|
// one by one prevents reliable block/parent verification.
|
|
func TestMadeupHashChainDrippingAttack(t *testing.T) {
|
|
// Create a random chain of hashes to drip
|
|
hashes := createHashes(16*blockCacheLimit, knownHash)
|
|
tester := newTester()
|
|
|
|
// Try and sync with the attacker, one hash at a time
|
|
tester.maxHashFetch = 1
|
|
tester.newPeer("attack", hashes, nil)
|
|
if err := tester.sync("attack"); err != errStallingPeer {
|
|
t.Fatalf("synchronisation error mismatch: have %v, want %v", err, errStallingPeer)
|
|
}
|
|
}
|
|
|
|
// Tests that if a malicious peer makes up a random block chain, and tried to
|
|
// push indefinitely, it actually gets caught with it.
|
|
func TestMadeupBlockChainAttack(t *testing.T) {
|
|
defaultBlockTTL := blockSoftTTL
|
|
defaultCrossCheckCycle := crossCheckCycle
|
|
|
|
blockSoftTTL = 100 * time.Millisecond
|
|
crossCheckCycle = 25 * time.Millisecond
|
|
|
|
// Create a long chain of blocks and simulate an invalid chain by dropping every second
|
|
hashes := createHashes(16*blockCacheLimit, knownHash)
|
|
blocks := createBlocksFromHashes(hashes)
|
|
|
|
gapped := make([]common.Hash, len(hashes)/2)
|
|
for i := 0; i < len(gapped); i++ {
|
|
gapped[i] = hashes[2*i]
|
|
}
|
|
// Try and sync with the malicious node and check that it fails
|
|
tester := newTester()
|
|
tester.newPeer("attack", gapped, blocks)
|
|
if err := tester.sync("attack"); err != errCrossCheckFailed {
|
|
t.Fatalf("synchronisation error mismatch: have %v, want %v", err, errCrossCheckFailed)
|
|
}
|
|
// Ensure that a valid chain can still pass sync
|
|
blockSoftTTL = defaultBlockTTL
|
|
crossCheckCycle = defaultCrossCheckCycle
|
|
|
|
tester.newPeer("valid", hashes, blocks)
|
|
if err := tester.sync("valid"); err != nil {
|
|
t.Fatalf("failed to synchronise blocks: %v", err)
|
|
}
|
|
}
|
|
|
|
// Advanced form of the above forged blockchain attack, where not only does the
|
|
// attacker make up a valid hashes for random blocks, but also forges the block
|
|
// parents to point to existing hashes.
|
|
func TestMadeupParentBlockChainAttack(t *testing.T) {
|
|
tester := newTester()
|
|
|
|
defaultBlockTTL := blockSoftTTL
|
|
defaultCrossCheckCycle := crossCheckCycle
|
|
|
|
blockSoftTTL = 100 * time.Millisecond
|
|
crossCheckCycle = 25 * time.Millisecond
|
|
|
|
// Create a long chain of blocks and simulate an invalid chain by dropping every second
|
|
hashes := createHashes(16*blockCacheLimit, knownHash)
|
|
blocks := createBlocksFromHashes(hashes)
|
|
tester.newPeer("valid", hashes, blocks)
|
|
|
|
for _, block := range blocks {
|
|
block.ParentHeaderHash = knownHash // Simulate pointing to already known hash
|
|
}
|
|
tester.newPeer("attack", hashes, blocks)
|
|
|
|
// Try and sync with the malicious node and check that it fails
|
|
if err := tester.sync("attack"); err != errCrossCheckFailed {
|
|
t.Fatalf("synchronisation error mismatch: have %v, want %v", err, errCrossCheckFailed)
|
|
}
|
|
// Ensure that a valid chain can still pass sync
|
|
blockSoftTTL = defaultBlockTTL
|
|
crossCheckCycle = defaultCrossCheckCycle
|
|
|
|
if err := tester.sync("valid"); err != nil {
|
|
t.Fatalf("failed to synchronise blocks: %v", err)
|
|
}
|
|
}
|
|
|
|
// Tests that if one/multiple malicious peers try to feed a banned blockchain to
|
|
// the downloader, it will not keep refetching the same chain indefinitely, but
|
|
// gradually block pieces of it, until it's head is also blocked.
|
|
func TestBannedChainStarvationAttack(t *testing.T) {
|
|
// Create the tester and ban the selected hash
|
|
tester := newTester()
|
|
tester.downloader.banned.Add(bannedHash)
|
|
|
|
// Construct a valid chain, for it and ban the fork
|
|
hashes := createHashes(8*blockCacheLimit, knownHash)
|
|
blocks := createBlocksFromHashes(hashes)
|
|
tester.newPeer("valid", hashes, blocks)
|
|
|
|
fork := len(hashes)/2 - 23
|
|
hashes = append(createHashes(4*blockCacheLimit, bannedHash), hashes[fork:]...)
|
|
blocks = createBlocksFromHashes(hashes)
|
|
tester.newPeer("attack", hashes, blocks)
|
|
|
|
// Iteratively try to sync, and verify that the banned hash list grows until
|
|
// the head of the invalid chain is blocked too.
|
|
for banned := tester.downloader.banned.Size(); ; {
|
|
// Try to sync with the attacker, check hash chain failure
|
|
if err := tester.sync("attack"); err != errInvalidChain {
|
|
if tester.downloader.banned.Has(hashes[0]) && err == errBannedHead {
|
|
break
|
|
}
|
|
t.Fatalf("synchronisation error mismatch: have %v, want %v", err, errInvalidChain)
|
|
}
|
|
// Check that the ban list grew with at least 1 new item, or all banned
|
|
bans := tester.downloader.banned.Size()
|
|
if bans < banned+1 {
|
|
t.Fatalf("ban count mismatch: have %v, want %v+", bans, banned+1)
|
|
}
|
|
banned = bans
|
|
}
|
|
// Check that after banning an entire chain, bad peers get dropped
|
|
if err := tester.newPeer("new attacker", hashes, blocks); err != errBannedHead {
|
|
t.Fatalf("peer registration mismatch: have %v, want %v", err, errBannedHead)
|
|
}
|
|
if peer := tester.downloader.peers.Peer("new attacker"); peer != nil {
|
|
t.Fatalf("banned attacker registered: %v", peer)
|
|
}
|
|
// Ensure that a valid chain can still pass sync
|
|
if err := tester.sync("valid"); err != nil {
|
|
t.Fatalf("failed to synchronise blocks: %v", err)
|
|
}
|
|
}
|
|
|
|
// Tests that if a peer sends excessively many/large invalid chains that are
|
|
// gradually banned, it will have an upper limit on the consumed memory and also
|
|
// the origin bad hashes will not be evacuated.
|
|
func TestBannedChainMemoryExhaustionAttack(t *testing.T) {
|
|
// Create the tester and ban the selected hash
|
|
tester := newTester()
|
|
tester.downloader.banned.Add(bannedHash)
|
|
|
|
// Reduce the test size a bit
|
|
defaultMaxBlockFetch := MaxBlockFetch
|
|
defaultMaxBannedHashes := maxBannedHashes
|
|
|
|
MaxBlockFetch = 4
|
|
maxBannedHashes = 256
|
|
|
|
// Construct a banned chain with more chunks than the ban limit
|
|
hashes := createHashes(8*blockCacheLimit, knownHash)
|
|
blocks := createBlocksFromHashes(hashes)
|
|
tester.newPeer("valid", hashes, blocks)
|
|
|
|
fork := len(hashes)/2 - 23
|
|
hashes = append(createHashes(maxBannedHashes*MaxBlockFetch, bannedHash), hashes[fork:]...)
|
|
blocks = createBlocksFromHashes(hashes)
|
|
tester.newPeer("attack", hashes, blocks)
|
|
|
|
// Iteratively try to sync, and verify that the banned hash list grows until
|
|
// the head of the invalid chain is blocked too.
|
|
for {
|
|
// Try to sync with the attacker, check hash chain failure
|
|
if err := tester.sync("attack"); err != errInvalidChain {
|
|
t.Fatalf("synchronisation error mismatch: have %v, want %v", err, errInvalidChain)
|
|
}
|
|
// Short circuit if the entire chain was banned
|
|
if tester.downloader.banned.Has(hashes[0]) {
|
|
break
|
|
}
|
|
// Otherwise ensure we never exceed the memory allowance and the hard coded bans are untouched
|
|
if bans := tester.downloader.banned.Size(); bans > maxBannedHashes {
|
|
t.Fatalf("ban cap exceeded: have %v, want max %v", bans, maxBannedHashes)
|
|
}
|
|
for hash, _ := range core.BadHashes {
|
|
if !tester.downloader.banned.Has(hash) {
|
|
t.Fatalf("hard coded ban evacuated: %x", hash)
|
|
}
|
|
}
|
|
}
|
|
// Ensure that a valid chain can still pass sync
|
|
MaxBlockFetch = defaultMaxBlockFetch
|
|
maxBannedHashes = defaultMaxBannedHashes
|
|
|
|
if err := tester.sync("valid"); err != nil {
|
|
t.Fatalf("failed to synchronise blocks: %v", err)
|
|
}
|
|
}
|
|
|
|
// Tests that misbehaving peers are disconnected, whilst behaving ones are not.
|
|
func TestHashAttackerDropping(t *testing.T) {
|
|
// Define the disconnection requirement for individual hash fetch errors
|
|
tests := []struct {
|
|
result error
|
|
drop bool
|
|
}{
|
|
{nil, false}, // Sync succeeded, all is well
|
|
{errBusy, false}, // Sync is already in progress, no problem
|
|
{errUnknownPeer, false}, // Peer is unknown, was already dropped, don't double drop
|
|
{errBadPeer, true}, // Peer was deemed bad for some reason, drop it
|
|
{errStallingPeer, true}, // Peer was detected to be stalling, drop it
|
|
{errBannedHead, true}, // Peer's head hash is a known bad hash, drop it
|
|
{errNoPeers, false}, // No peers to download from, soft race, no issue
|
|
{errPendingQueue, false}, // There are blocks still cached, wait to exhaust, no issue
|
|
{errTimeout, true}, // No hashes received in due time, drop the peer
|
|
{errEmptyHashSet, true}, // No hashes were returned as a response, drop as it's a dead end
|
|
{errPeersUnavailable, true}, // Nobody had the advertised blocks, drop the advertiser
|
|
{errInvalidChain, true}, // Hash chain was detected as invalid, definitely drop
|
|
{errCrossCheckFailed, true}, // Hash-origin failed to pass a block cross check, drop
|
|
{errCancelHashFetch, false}, // Synchronisation was canceled, origin may be innocent, don't drop
|
|
{errCancelBlockFetch, false}, // Synchronisation was canceled, origin may be innocent, don't drop
|
|
{errCancelChainImport, false}, // Synchronisation was canceled, origin may be innocent, don't drop
|
|
}
|
|
// Run the tests and check disconnection status
|
|
tester := newTester()
|
|
for i, tt := range tests {
|
|
// Register a new peer and ensure it's presence
|
|
id := fmt.Sprintf("test %d", i)
|
|
if err := tester.newPeer(id, []common.Hash{knownHash}, nil); err != nil {
|
|
t.Fatalf("test %d: failed to register new peer: %v", i, err)
|
|
}
|
|
if _, ok := tester.peerHashes[id]; !ok {
|
|
t.Fatalf("test %d: registered peer not found", i)
|
|
}
|
|
// Simulate a synchronisation and check the required result
|
|
tester.downloader.synchroniseMock = func(string, common.Hash) error { return tt.result }
|
|
|
|
tester.downloader.Synchronise(id, knownHash)
|
|
if _, ok := tester.peerHashes[id]; !ok != tt.drop {
|
|
t.Errorf("test %d: peer drop mismatch for %v: have %v, want %v", i, tt.result, !ok, tt.drop)
|
|
}
|
|
}
|
|
}
|
|
|
|
// Tests that feeding bad blocks will result in a peer drop.
|
|
func TestBlockAttackerDropping(t *testing.T) {
|
|
// Define the disconnection requirement for individual block import errors
|
|
tests := []struct {
|
|
failure bool
|
|
drop bool
|
|
}{{true, true}, {false, false}}
|
|
|
|
// Run the tests and check disconnection status
|
|
tester := newTester()
|
|
for i, tt := range tests {
|
|
// Register a new peer and ensure it's presence
|
|
id := fmt.Sprintf("test %d", i)
|
|
if err := tester.newPeer(id, []common.Hash{common.Hash{}}, nil); err != nil {
|
|
t.Fatalf("test %d: failed to register new peer: %v", i, err)
|
|
}
|
|
if _, ok := tester.peerHashes[id]; !ok {
|
|
t.Fatalf("test %d: registered peer not found", i)
|
|
}
|
|
// Assemble a good or bad block, depending of the test
|
|
raw := createBlock(1, knownHash, common.Hash{})
|
|
if tt.failure {
|
|
raw = createBlock(1, unknownHash, common.Hash{})
|
|
}
|
|
block := &Block{OriginPeer: id, RawBlock: raw}
|
|
|
|
// Simulate block processing and check the result
|
|
tester.downloader.queue.blockCache[0] = block
|
|
tester.downloader.process()
|
|
if _, ok := tester.peerHashes[id]; !ok != tt.drop {
|
|
t.Errorf("test %d: peer drop mismatch for %v: have %v, want %v", i, tt.failure, !ok, tt.drop)
|
|
}
|
|
}
|
|
}
|