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authorPéter Szilágyi <peterke@gmail.com>2015-10-06 00:37:56 +0800
committerPéter Szilágyi <peterke@gmail.com>2015-10-19 15:03:09 +0800
commitab27bee25a845be90bd60e774ff68d2ea1501772 (patch)
tree44d6a980fabd4cb065abe333e93a1088a3502466 /trie/sync_test.go
parent832b37c8221e330896c36eb419d92af6b1fdc9dd (diff)
downloaddexon-ab27bee25a845be90bd60e774ff68d2ea1501772.tar.gz
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core, eth, trie: direct state trie synchronization
Diffstat (limited to 'trie/sync_test.go')
-rw-r--r--trie/sync_test.go257
1 files changed, 257 insertions, 0 deletions
diff --git a/trie/sync_test.go b/trie/sync_test.go
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+// Copyright 2015 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum 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 go-ethereum 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 go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package trie
+
+import (
+ "bytes"
+ "testing"
+
+ "github.com/ethereum/go-ethereum/common"
+ "github.com/ethereum/go-ethereum/ethdb"
+)
+
+// makeTestTrie create a sample test trie to test node-wise reconstruction.
+func makeTestTrie() (ethdb.Database, *Trie, map[string][]byte) {
+ // Create an empty trie
+ db, _ := ethdb.NewMemDatabase()
+ trie, _ := New(common.Hash{}, db)
+
+ // Fill it with some arbitrary data
+ content := make(map[string][]byte)
+ for i := byte(0); i < 255; i++ {
+ key, val := common.LeftPadBytes([]byte{1, i}, 32), []byte{i}
+ content[string(key)] = val
+ trie.Update(key, val)
+
+ key, val = common.LeftPadBytes([]byte{2, i}, 32), []byte{i}
+ content[string(key)] = val
+ trie.Update(key, val)
+ }
+ trie.Commit()
+
+ // Return the generated trie
+ return db, trie, content
+}
+
+// checkTrieContents cross references a reconstructed trie with an expected data
+// content map.
+func checkTrieContents(t *testing.T, db Database, root []byte, content map[string][]byte) {
+ trie, err := New(common.BytesToHash(root), db)
+ if err != nil {
+ t.Fatalf("failed to create trie at %x: %v", root, err)
+ }
+ for key, val := range content {
+ if have := trie.Get([]byte(key)); bytes.Compare(have, val) != 0 {
+ t.Errorf("entry %x: content mismatch: have %x, want %x", key, have, val)
+ }
+ }
+}
+
+// Tests that an empty trie is not scheduled for syncing.
+func TestEmptyTrieSync(t *testing.T) {
+ emptyA, _ := New(common.Hash{}, nil)
+ emptyB, _ := New(emptyRoot, nil)
+
+ for i, trie := range []*Trie{emptyA, emptyB} {
+ db, _ := ethdb.NewMemDatabase()
+ if req := NewTrieSync(common.BytesToHash(trie.Root()), db, nil).Missing(1); len(req) != 0 {
+ t.Errorf("test %d: content requested for empty trie: %v", i, req)
+ }
+ }
+}
+
+// Tests that given a root hash, a trie can sync iteratively on a single thread,
+// requesting retrieval tasks and returning all of them in one go.
+func TestIterativeTrieSyncIndividual(t *testing.T) { testIterativeTrieSync(t, 1) }
+func TestIterativeTrieSyncBatched(t *testing.T) { testIterativeTrieSync(t, 100) }
+
+func testIterativeTrieSync(t *testing.T, batch int) {
+ // Create a random trie to copy
+ srcDb, srcTrie, srcData := makeTestTrie()
+
+ // Create a destination trie and sync with the scheduler
+ dstDb, _ := ethdb.NewMemDatabase()
+ sched := NewTrieSync(common.BytesToHash(srcTrie.Root()), dstDb, nil)
+
+ queue := append([]common.Hash{}, sched.Missing(batch)...)
+ for len(queue) > 0 {
+ results := make([]SyncResult, len(queue))
+ for i, hash := range queue {
+ data, err := srcDb.Get(hash.Bytes())
+ if err != nil {
+ t.Fatalf("failed to retrieve node data for %x: %v", hash, err)
+ }
+ results[i] = SyncResult{hash, data}
+ }
+ if index, err := sched.Process(results); err != nil {
+ t.Fatalf("failed to process result #%d: %v", index, err)
+ }
+ queue = append(queue[:0], sched.Missing(batch)...)
+ }
+ // Cross check that the two tries re in sync
+ checkTrieContents(t, dstDb, srcTrie.Root(), srcData)
+}
+
+// Tests that the trie scheduler can correctly reconstruct the state even if only
+// partial results are returned, and the others sent only later.
+func TestIterativeDelayedTrieSync(t *testing.T) {
+ // Create a random trie to copy
+ srcDb, srcTrie, srcData := makeTestTrie()
+
+ // Create a destination trie and sync with the scheduler
+ dstDb, _ := ethdb.NewMemDatabase()
+ sched := NewTrieSync(common.BytesToHash(srcTrie.Root()), dstDb, nil)
+
+ queue := append([]common.Hash{}, sched.Missing(10000)...)
+ for len(queue) > 0 {
+ // Sync only half of the scheduled nodes
+ results := make([]SyncResult, len(queue)/2+1)
+ for i, hash := range queue[:len(results)] {
+ data, err := srcDb.Get(hash.Bytes())
+ if err != nil {
+ t.Fatalf("failed to retrieve node data for %x: %v", hash, err)
+ }
+ results[i] = SyncResult{hash, data}
+ }
+ if index, err := sched.Process(results); err != nil {
+ t.Fatalf("failed to process result #%d: %v", index, err)
+ }
+ queue = append(queue[len(results):], sched.Missing(10000)...)
+ }
+ // Cross check that the two tries re in sync
+ checkTrieContents(t, dstDb, srcTrie.Root(), srcData)
+}
+
+// Tests that given a root hash, a trie can sync iteratively on a single thread,
+// requesting retrieval tasks and returning all of them in one go, however in a
+// random order.
+func TestIterativeRandomTrieSyncIndividual(t *testing.T) { testIterativeRandomTrieSync(t, 1) }
+func TestIterativeRandomTrieSyncBatched(t *testing.T) { testIterativeRandomTrieSync(t, 100) }
+
+func testIterativeRandomTrieSync(t *testing.T, batch int) {
+ // Create a random trie to copy
+ srcDb, srcTrie, srcData := makeTestTrie()
+
+ // Create a destination trie and sync with the scheduler
+ dstDb, _ := ethdb.NewMemDatabase()
+ sched := NewTrieSync(common.BytesToHash(srcTrie.Root()), dstDb, nil)
+
+ queue := make(map[common.Hash]struct{})
+ for _, hash := range sched.Missing(batch) {
+ queue[hash] = struct{}{}
+ }
+ for len(queue) > 0 {
+ // Fetch all the queued nodes in a random order
+ results := make([]SyncResult, 0, len(queue))
+ for hash, _ := range queue {
+ data, err := srcDb.Get(hash.Bytes())
+ if err != nil {
+ t.Fatalf("failed to retrieve node data for %x: %v", hash, err)
+ }
+ results = append(results, SyncResult{hash, data})
+ }
+ // Feed the retrieved results back and queue new tasks
+ if index, err := sched.Process(results); err != nil {
+ t.Fatalf("failed to process result #%d: %v", index, err)
+ }
+ queue = make(map[common.Hash]struct{})
+ for _, hash := range sched.Missing(batch) {
+ queue[hash] = struct{}{}
+ }
+ }
+ // Cross check that the two tries re in sync
+ checkTrieContents(t, dstDb, srcTrie.Root(), srcData)
+}
+
+// Tests that the trie scheduler can correctly reconstruct the state even if only
+// partial results are returned (Even those randomly), others sent only later.
+func TestIterativeRandomDelayedTrieSync(t *testing.T) {
+ // Create a random trie to copy
+ srcDb, srcTrie, srcData := makeTestTrie()
+
+ // Create a destination trie and sync with the scheduler
+ dstDb, _ := ethdb.NewMemDatabase()
+ sched := NewTrieSync(common.BytesToHash(srcTrie.Root()), dstDb, nil)
+
+ queue := make(map[common.Hash]struct{})
+ for _, hash := range sched.Missing(10000) {
+ queue[hash] = struct{}{}
+ }
+ for len(queue) > 0 {
+ // Sync only half of the scheduled nodes, even those in random order
+ results := make([]SyncResult, 0, len(queue)/2+1)
+ for hash, _ := range queue {
+ data, err := srcDb.Get(hash.Bytes())
+ if err != nil {
+ t.Fatalf("failed to retrieve node data for %x: %v", hash, err)
+ }
+ results = append(results, SyncResult{hash, data})
+
+ if len(results) >= cap(results) {
+ break
+ }
+ }
+ // Feed the retrieved results back and queue new tasks
+ if index, err := sched.Process(results); err != nil {
+ t.Fatalf("failed to process result #%d: %v", index, err)
+ }
+ for _, result := range results {
+ delete(queue, result.Hash)
+ }
+ for _, hash := range sched.Missing(10000) {
+ queue[hash] = struct{}{}
+ }
+ }
+ // Cross check that the two tries re in sync
+ checkTrieContents(t, dstDb, srcTrie.Root(), srcData)
+}
+
+// Tests that a trie sync will not request nodes multiple times, even if they
+// have such references.
+func TestDuplicateAvoidanceTrieSync(t *testing.T) {
+ // Create a random trie to copy
+ srcDb, srcTrie, srcData := makeTestTrie()
+
+ // Create a destination trie and sync with the scheduler
+ dstDb, _ := ethdb.NewMemDatabase()
+ sched := NewTrieSync(common.BytesToHash(srcTrie.Root()), dstDb, nil)
+
+ queue := append([]common.Hash{}, sched.Missing(0)...)
+ requested := make(map[common.Hash]struct{})
+
+ for len(queue) > 0 {
+ results := make([]SyncResult, len(queue))
+ for i, hash := range queue {
+ data, err := srcDb.Get(hash.Bytes())
+ if err != nil {
+ t.Fatalf("failed to retrieve node data for %x: %v", hash, err)
+ }
+ if _, ok := requested[hash]; ok {
+ t.Errorf("hash %x already requested once", hash)
+ }
+ requested[hash] = struct{}{}
+
+ results[i] = SyncResult{hash, data}
+ }
+ if index, err := sched.Process(results); err != nil {
+ t.Fatalf("failed to process result #%d: %v", index, err)
+ }
+ queue = append(queue[:0], sched.Missing(0)...)
+ }
+ // Cross check that the two tries re in sync
+ checkTrieContents(t, dstDb, srcTrie.Root(), srcData)
+}