2cdf6ee7e0
This PR enables the indexers to work in light client mode by downloading a part of these tries (the Merkle proofs of the last values of the last known section) in order to be able to add new values and recalculate subsequent hashes. It also adds CHT data to NodeInfo.
123 lines
3.4 KiB
Go
123 lines
3.4 KiB
Go
// Copyright 2016 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package les
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import (
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"context"
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"github.com/ethereum/go-ethereum/core"
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"github.com/ethereum/go-ethereum/ethdb"
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"github.com/ethereum/go-ethereum/light"
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"github.com/ethereum/go-ethereum/log"
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)
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// LesOdr implements light.OdrBackend
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type LesOdr struct {
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db ethdb.Database
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chtIndexer, bloomTrieIndexer, bloomIndexer *core.ChainIndexer
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retriever *retrieveManager
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stop chan struct{}
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}
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func NewLesOdr(db ethdb.Database, retriever *retrieveManager) *LesOdr {
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return &LesOdr{
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db: db,
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retriever: retriever,
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stop: make(chan struct{}),
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}
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}
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// Stop cancels all pending retrievals
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func (odr *LesOdr) Stop() {
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close(odr.stop)
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}
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// Database returns the backing database
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func (odr *LesOdr) Database() ethdb.Database {
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return odr.db
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}
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// SetIndexers adds the necessary chain indexers to the ODR backend
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func (odr *LesOdr) SetIndexers(chtIndexer, bloomTrieIndexer, bloomIndexer *core.ChainIndexer) {
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odr.chtIndexer = chtIndexer
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odr.bloomTrieIndexer = bloomTrieIndexer
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odr.bloomIndexer = bloomIndexer
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}
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// ChtIndexer returns the CHT chain indexer
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func (odr *LesOdr) ChtIndexer() *core.ChainIndexer {
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return odr.chtIndexer
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}
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// BloomTrieIndexer returns the bloom trie chain indexer
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func (odr *LesOdr) BloomTrieIndexer() *core.ChainIndexer {
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return odr.bloomTrieIndexer
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}
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// BloomIndexer returns the bloombits chain indexer
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func (odr *LesOdr) BloomIndexer() *core.ChainIndexer {
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return odr.bloomIndexer
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}
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const (
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MsgBlockBodies = iota
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MsgCode
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MsgReceipts
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MsgProofsV1
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MsgProofsV2
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MsgHeaderProofs
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MsgHelperTrieProofs
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)
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// Msg encodes a LES message that delivers reply data for a request
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type Msg struct {
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MsgType int
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ReqID uint64
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Obj interface{}
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}
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// Retrieve tries to fetch an object from the LES network.
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// If the network retrieval was successful, it stores the object in local db.
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func (odr *LesOdr) Retrieve(ctx context.Context, req light.OdrRequest) (err error) {
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lreq := LesRequest(req)
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reqID := genReqID()
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rq := &distReq{
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getCost: func(dp distPeer) uint64 {
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return lreq.GetCost(dp.(*peer))
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},
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canSend: func(dp distPeer) bool {
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p := dp.(*peer)
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return lreq.CanSend(p)
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},
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request: func(dp distPeer) func() {
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p := dp.(*peer)
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cost := lreq.GetCost(p)
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p.fcServer.QueueRequest(reqID, cost)
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return func() { lreq.Request(reqID, p) }
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},
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}
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if err = odr.retriever.retrieve(ctx, reqID, rq, func(p distPeer, msg *Msg) error { return lreq.Validate(odr.db, msg) }, odr.stop); err == nil {
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// retrieved from network, store in db
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req.StoreResult(odr.db)
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} else {
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log.Debug("Failed to retrieve data from network", "err", err)
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}
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return
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}
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