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// Copyright 2018 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 les
import (
"fmt"
"math/big"
"sync"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/core/rawdb"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/eth"
"github.com/ethereum/go-ethereum/ethdb"
"github.com/ethereum/go-ethereum/light"
"github.com/ethereum/go-ethereum/p2p"
"github.com/ethereum/go-ethereum/p2p/discv5"
"github.com/ethereum/go-ethereum/p2p/enode"
"github.com/ethereum/go-ethereum/params"
)
func errResp(code errCode, format string, v ...interface{}) error {
return fmt.Errorf("%v - %v", code, fmt.Sprintf(format, v...))
}
func lesTopic(genesisHash common.Hash, protocolVersion uint) discv5.Topic {
var name string
switch protocolVersion {
case lpv2:
name = "LES2"
default:
panic(nil)
}
return discv5.Topic(name + "@" + common.Bytes2Hex(genesisHash.Bytes()[0:8]))
}
type chainReader interface {
CurrentHeader() *types.Header
}
// lesCommons contains fields needed by both server and client.
type lesCommons struct {
genesis common.Hash
config *eth.Config
chainConfig *params.ChainConfig
iConfig *light.IndexerConfig
chainDb ethdb.Database
peers *peerSet
chainReader chainReader
chtIndexer, bloomTrieIndexer *core.ChainIndexer
oracle *checkpointOracle
closeCh chan struct{}
wg sync.WaitGroup
}
// NodeInfo represents a short summary of the Ethereum sub-protocol metadata
// known about the host peer.
type NodeInfo struct {
Network uint64 `json:"network"` // Ethereum network ID (1=Frontier, 2=Morden, Ropsten=3, Rinkeby=4)
Difficulty *big.Int `json:"difficulty"` // Total difficulty of the host's blockchain
Genesis common.Hash `json:"genesis"` // SHA3 hash of the host's genesis block
Config *params.ChainConfig `json:"config"` // Chain configuration for the fork rules
Head common.Hash `json:"head"` // SHA3 hash of the host's best owned block
CHT params.TrustedCheckpoint `json:"cht"` // Trused CHT checkpoint for fast catchup
}
// makeProtocols creates protocol descriptors for the given LES versions.
func (c *lesCommons) makeProtocols(versions []uint, runPeer func(version uint, p *p2p.Peer, rw p2p.MsgReadWriter) error, peerInfo func(id enode.ID) interface{}) []p2p.Protocol {
protos := make([]p2p.Protocol, len(versions))
for i, version := range versions {
version := version
protos[i] = p2p.Protocol{
Name: "les",
Version: version,
Length: ProtocolLengths[version],
NodeInfo: c.nodeInfo,
Run: func(peer *p2p.Peer, rw p2p.MsgReadWriter) error {
return runPeer(version, peer, rw)
},
PeerInfo: peerInfo,
}
}
return protos
}
// nodeInfo retrieves some protocol metadata about the running host node.
func (c *lesCommons) nodeInfo() interface{} {
head := c.chainReader.CurrentHeader()
hash := head.Hash()
return &NodeInfo{
Network: c.config.NetworkId,
Difficulty: rawdb.ReadTd(c.chainDb, hash, head.Number.Uint64()),
Genesis: c.genesis,
Config: c.chainConfig,
Head: hash,
CHT: c.latestLocalCheckpoint(),
}
}
// latestLocalCheckpoint finds the common stored section index and returns a set
// of post-processed trie roots (CHT and BloomTrie) associated with the appropriate
// section index and head hash as a local checkpoint package.
func (c *lesCommons) latestLocalCheckpoint() params.TrustedCheckpoint {
sections, _, _ := c.chtIndexer.Sections()
sections2, _, _ := c.bloomTrieIndexer.Sections()
// Cap the section index if the two sections are not consistent.
if sections > sections2 {
sections = sections2
}
if sections == 0 {
// No checkpoint information can be provided.
return params.TrustedCheckpoint{}
}
return c.localCheckpoint(sections - 1)
}
// localCheckpoint returns a set of post-processed trie roots (CHT and BloomTrie)
// associated with the appropriate head hash by specific section index.
//
// The returned checkpoint is only the checkpoint generated by the local indexers,
// not the stable checkpoint registered in the registrar contract.
func (c *lesCommons) localCheckpoint(index uint64) params.TrustedCheckpoint {
sectionHead := c.chtIndexer.SectionHead(index)
return params.TrustedCheckpoint{
SectionIndex: index,
SectionHead: sectionHead,
CHTRoot: light.GetChtRoot(c.chainDb, index, sectionHead),
BloomRoot: light.GetBloomTrieRoot(c.chainDb, index, sectionHead),
}
}
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