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Support snap sync for consortium consensus (#26)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,162 @@ | ||
| // Copyright 2017 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/>. | ||
|
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| package consortium | ||
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| import ( | ||
| "encoding/json" | ||
| "time" | ||
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| "github.com/ethereum/go-ethereum/common" | ||
| "github.com/ethereum/go-ethereum/consensus" | ||
| "github.com/ethereum/go-ethereum/core/types" | ||
| "github.com/ethereum/go-ethereum/ethdb" | ||
| "github.com/ethereum/go-ethereum/log" | ||
| "github.com/ethereum/go-ethereum/params" | ||
| lru "github.com/hashicorp/golang-lru" | ||
| ) | ||
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| // Snapshot is the state of the authorization voting at a given point in time. | ||
| type Snapshot struct { | ||
| config *params.ConsortiumConfig // Consensus engine parameters to fine tune behavior | ||
| sigcache *lru.ARCCache // Cache of recent block signatures to speed up ecrecover | ||
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| Number uint64 `json:"number"` // Block number where the snapshot was created | ||
| Hash common.Hash `json:"hash"` // Block hash where the snapshot was created | ||
| SignerSet map[common.Address]struct{} `json:"signerSet"` // Set of authorized signers at this moment | ||
| SignerList []common.Address `json:"signerList"` // List of authorized signers at this moment | ||
| } | ||
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| // newSnapshot creates a new snapshot with the specified startup parameters. This | ||
| // method does not initialize the set of recent signers, so only ever use if for | ||
| // the genesis block. | ||
| func newSnapshot(config *params.ConsortiumConfig, sigcache *lru.ARCCache, number uint64, hash common.Hash, signers []common.Address) *Snapshot { | ||
| snap := &Snapshot{ | ||
| config: config, | ||
| sigcache: sigcache, | ||
| Number: number, | ||
| Hash: hash, | ||
| SignerSet: make(map[common.Address]struct{}), | ||
| SignerList: make([]common.Address, 0, len(signers)), | ||
| } | ||
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| for _, signer := range signers { | ||
| snap.SignerSet[signer] = struct{}{} | ||
| snap.SignerList = append(snap.SignerList, signer) | ||
| } | ||
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| return snap | ||
| } | ||
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| // loadSnapshot loads an existing snapshot from the database. | ||
| func loadSnapshot(config *params.ConsortiumConfig, sigcache *lru.ARCCache, db ethdb.Database, hash common.Hash) (*Snapshot, error) { | ||
| blob, err := db.Get(append([]byte("consortium-"), hash[:]...)) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| snap := new(Snapshot) | ||
| if err := json.Unmarshal(blob, snap); err != nil { | ||
| return nil, err | ||
| } | ||
| snap.config = config | ||
| snap.sigcache = sigcache | ||
|
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| return snap, nil | ||
| } | ||
|
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| // store inserts the snapshot into the database. | ||
| func (s *Snapshot) store(db ethdb.Database) error { | ||
| blob, err := json.Marshal(s) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| return db.Put(append([]byte("consortium-"), s.Hash[:]...), blob) | ||
| } | ||
|
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| // copy creates a deep copy of the snapshot, though not the individual votes. | ||
| func (s *Snapshot) copy() *Snapshot { | ||
| cpy := &Snapshot{ | ||
| config: s.config, | ||
| sigcache: s.sigcache, | ||
| Number: s.Number, | ||
| Hash: s.Hash, | ||
| SignerSet: make(map[common.Address]struct{}), | ||
| SignerList: make([]common.Address, 0, len(s.SignerList)), | ||
| } | ||
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| for _, signer := range s.SignerList { | ||
| cpy.SignerSet[signer] = struct{}{} | ||
| cpy.SignerList = append(cpy.SignerList, signer) | ||
| } | ||
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| return cpy | ||
| } | ||
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| // apply creates a new authorization snapshot by applying the given headers to | ||
| // the original one. | ||
| func (s *Snapshot) apply(chain consensus.ChainHeaderReader, c *Consortium, headers []*types.Header, parents []*types.Header) (*Snapshot, error) { | ||
| // Allow passing in no headers for cleaner code | ||
| if len(headers) == 0 { | ||
| return s, nil | ||
| } | ||
|
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| // Iterate through the headers and create a new snapshot | ||
| snap := s.copy() | ||
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| var ( | ||
| start = time.Now() | ||
| logged = time.Now() | ||
| ) | ||
| for i, header := range headers { | ||
| // Resolve the authorization key and check against signers | ||
| signer, err := ecrecover(header, s.sigcache) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| if _, ok := snap.SignerSet[signer]; !ok { | ||
| return nil, errUnauthorizedSigner | ||
| } | ||
|
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| // If we're taking too much time (ecrecover), notify the user once a while | ||
| if time.Since(logged) > 8*time.Second { | ||
| log.Info("Reconstructing snapshot", "processed", i, "total", len(headers), "elapsed", common.PrettyDuration(time.Since(start))) | ||
| logged = time.Now() | ||
| } | ||
| } | ||
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| snap.Number += uint64(len(headers)) | ||
| snap.Hash = headers[len(headers)-1].Hash() | ||
|
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| // Update the list of signers | ||
| number := headers[len(headers)-1].Number.Uint64() | ||
| validators, err := c.getValidatorsFromLastCheckpoint(chain, number-1, parents) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| snap.SignerSet = make(map[common.Address]struct{}) | ||
| snap.SignerList = make([]common.Address, 0, len(validators)) | ||
| for _, signer := range validators { | ||
| snap.SignerSet[signer] = struct{}{} | ||
| snap.SignerList = append(snap.SignerList, signer) | ||
| } | ||
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| // If we're taking too much time, notify the user once a while | ||
| if time.Since(start) > 8*time.Second { | ||
| log.Info("Reconstructed snapshot", "processed", len(headers), "elapsed", common.PrettyDuration(time.Since(start))) | ||
| } | ||
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| return snap, nil | ||
| } |