119 lines
3.4 KiB
Go
119 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, chtIndexer, bloomTrieIndexer, bloomIndexer *core.ChainIndexer, retriever *retrieveManager) *LesOdr {
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return &LesOdr{
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db: db,
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chtIndexer: chtIndexer,
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bloomTrieIndexer: bloomTrieIndexer,
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bloomIndexer: bloomIndexer,
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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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// 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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