100 lines
3.6 KiB
Go
100 lines
3.6 KiB
Go
// Copyright 2018 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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"fmt"
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"math/big"
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"sync"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/core"
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"github.com/ethereum/go-ethereum/core/rawdb"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/eth/ethconfig"
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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/p2p"
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"github.com/ethereum/go-ethereum/p2p/enode"
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"github.com/ethereum/go-ethereum/params"
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)
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func errResp(code errCode, format string, v ...interface{}) error {
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return fmt.Errorf("%v - %v", code, fmt.Sprintf(format, v...))
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}
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type chainReader interface {
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CurrentHeader() *types.Header
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}
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// lesCommons contains fields needed by both server and client.
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type lesCommons struct {
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genesis common.Hash
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config *ethconfig.Config
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chainConfig *params.ChainConfig
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iConfig *light.IndexerConfig
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chainDb, lesDb ethdb.Database
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chainReader chainReader
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chtIndexer, bloomTrieIndexer *core.ChainIndexer
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closeCh chan struct{}
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wg sync.WaitGroup
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}
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// NodeInfo represents a short summary of the Ethereum sub-protocol metadata
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// known about the host peer.
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type NodeInfo struct {
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Network uint64 `json:"network"` // Ethereum network ID (1=Mainnet, Goerli=5)
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Difficulty *big.Int `json:"difficulty"` // Total difficulty of the host's blockchain
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Genesis common.Hash `json:"genesis"` // SHA3 hash of the host's genesis block
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Config *params.ChainConfig `json:"config"` // Chain configuration for the fork rules
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Head common.Hash `json:"head"` // SHA3 hash of the host's best owned block
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}
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// makeProtocols creates protocol descriptors for the given LES versions.
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func (c *lesCommons) makeProtocols(versions []uint, runPeer func(version uint, p *p2p.Peer, rw p2p.MsgReadWriter) error, peerInfo func(id enode.ID) interface{}, dialCandidates enode.Iterator) []p2p.Protocol {
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protos := make([]p2p.Protocol, len(versions))
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for i, version := range versions {
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version := version
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protos[i] = p2p.Protocol{
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Name: "les",
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Version: version,
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Length: ProtocolLengths[version],
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NodeInfo: c.nodeInfo,
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Run: func(peer *p2p.Peer, rw p2p.MsgReadWriter) error {
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return runPeer(version, peer, rw)
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},
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PeerInfo: peerInfo,
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DialCandidates: dialCandidates,
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}
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}
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return protos
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}
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// nodeInfo retrieves some protocol metadata about the running host node.
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func (c *lesCommons) nodeInfo() interface{} {
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head := c.chainReader.CurrentHeader()
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hash := head.Hash()
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return &NodeInfo{
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Network: c.config.NetworkId,
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Difficulty: rawdb.ReadTd(c.chainDb, hash, head.Number.Uint64()),
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Genesis: c.genesis,
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Config: c.chainConfig,
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Head: hash,
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}
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}
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