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snapshotter/tests: verify snapdb post-state against trie (ethereum#20812
) * core/state/snapshot: basic trie-to-hash implementation * tests: validate snapshot after test * core/state/snapshot: fix review concerns
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,114 @@ | ||
| // Copyright 2020 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 snapshot | ||
|
|
||
| import ( | ||
| "sync" | ||
| "time" | ||
|
|
||
| "github.com/ethereum/go-ethereum/common" | ||
| "github.com/ethereum/go-ethereum/ethdb/memorydb" | ||
| "github.com/ethereum/go-ethereum/log" | ||
| "github.com/ethereum/go-ethereum/rlp" | ||
| "github.com/ethereum/go-ethereum/trie" | ||
| ) | ||
|
|
||
| // conversionAccount is used for converting between full and slim format. When | ||
| // doing this, we can consider 'balance' as a byte array, as it has already | ||
| // been converted from big.Int into an rlp-byteslice. | ||
| type conversionAccount struct { | ||
| Nonce uint64 | ||
| Balance []byte | ||
| Root []byte | ||
| CodeHash []byte | ||
| } | ||
|
|
||
| // SlimToFull converts data on the 'slim RLP' format into the full RLP-format | ||
| func SlimToFull(data []byte) ([]byte, error) { | ||
| acc := &conversionAccount{} | ||
| if err := rlp.DecodeBytes(data, acc); err != nil { | ||
| return nil, err | ||
| } | ||
| if len(acc.Root) == 0 { | ||
| acc.Root = emptyRoot[:] | ||
| } | ||
| if len(acc.CodeHash) == 0 { | ||
| acc.CodeHash = emptyCode[:] | ||
| } | ||
| fullData, err := rlp.EncodeToBytes(acc) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return fullData, nil | ||
| } | ||
|
|
||
| // trieKV represents a trie key-value pair | ||
| type trieKV struct { | ||
| key common.Hash | ||
| value []byte | ||
| } | ||
|
|
||
| type trieGeneratorFn func(in chan (trieKV), out chan (common.Hash)) | ||
|
|
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| // GenerateTrieRoot takes an account iterator and reproduces the root hash. | ||
| func GenerateTrieRoot(it AccountIterator) common.Hash { | ||
| return generateTrieRoot(it, stdGenerate) | ||
| } | ||
|
|
||
| func generateTrieRoot(it AccountIterator, generatorFn trieGeneratorFn) common.Hash { | ||
| var ( | ||
| in = make(chan trieKV) // chan to pass leaves | ||
| out = make(chan common.Hash) // chan to collect result | ||
| wg sync.WaitGroup | ||
| ) | ||
| wg.Add(1) | ||
| go func() { | ||
| generatorFn(in, out) | ||
| wg.Done() | ||
| }() | ||
| // Feed leaves | ||
| start := time.Now() | ||
| logged := time.Now() | ||
| accounts := 0 | ||
| for it.Next() { | ||
| slimData := it.Account() | ||
| fullData, _ := SlimToFull(slimData) | ||
| l := trieKV{it.Hash(), fullData} | ||
| in <- l | ||
| if time.Since(logged) > 8*time.Second { | ||
| log.Info("Generating trie hash from snapshot", | ||
| "at", l.key, "accounts", accounts, "elapsed", time.Since(start)) | ||
| logged = time.Now() | ||
| } | ||
| accounts++ | ||
| } | ||
| close(in) | ||
| result := <-out | ||
| log.Info("Generated trie hash from snapshot", "accounts", accounts, "elapsed", time.Since(start)) | ||
| wg.Wait() | ||
| return result | ||
| } | ||
|
|
||
| // stdGenerate is a very basic hexary trie builder which uses the same Trie | ||
| // as the rest of geth, with no enhancements or optimizations | ||
| func stdGenerate(in chan (trieKV), out chan (common.Hash)) { | ||
| t, _ := trie.New(common.Hash{}, trie.NewDatabase(memorydb.New())) | ||
| for leaf := range in { | ||
| t.TryUpdate(leaf.key[:], leaf.value) | ||
| } | ||
| out <- t.Hash() | ||
| } |
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