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commons.go
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commons.go
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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 (
"github.com/truechain/truechain-engineering-code/core"
"github.com/truechain/truechain-engineering-code/core/snailchain"
"github.com/truechain/truechain-engineering-code/light/fast"
"github.com/truechain/truechain-engineering-code/light/public"
"math/big"
"github.com/truechain/truechain-engineering-code/common"
"github.com/truechain/truechain-engineering-code/etrue"
"github.com/truechain/truechain-engineering-code/etruedb"
"github.com/truechain/truechain-engineering-code/light"
"github.com/truechain/truechain-engineering-code/p2p"
"github.com/truechain/truechain-engineering-code/p2p/enode"
"github.com/truechain/truechain-engineering-code/params"
)
// lesCommons contains fields needed by both server and client.
type lesCommons struct {
config *etrue.Config
iConfig *public.IndexerConfig
chainDb etruedb.Database
protocolManager *ProtocolManager
chtIndexer *snailchain.ChainIndexer
bloomTrieIndexer *core.ChainIndexer
}
// 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)
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
Difficulty *big.Int `json:"difficulty"` // Total difficulty of the host's blockchain
SnailGenesis common.Hash `json:"snailGenesis"` // SHA3 hash of the host's genesis block
SnailConfig *params.ChainConfig `json:"snailConfig"` // Chain configuration for the fork rules
SnailHead common.Hash `json:"snailHead"` // SHA3 hash of the host's best owned block
}
// makeProtocols creates protocol descriptors for the given LES versions.
func (c *lesCommons) makeProtocols(versions []uint) []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(p *p2p.Peer, rw p2p.MsgReadWriter) error {
return c.protocolManager.runPeer(version, p, rw)
},
PeerInfo: func(id enode.ID) interface{} {
if p := c.protocolManager.peers.Peer(peerIdToString(id)); p != nil {
return p.Info()
}
return nil
},
}
}
return protos
}
// nodeInfo retrieves some protocol metadata about the running host node.
func (c *lesCommons) nodeInfo() interface{} {
chain := c.protocolManager.blockchain
head := chain.CurrentHeader()
hash := head.Hash()
return &NodeInfo{
Network: c.config.NetworkId,
Genesis: chain.Genesis().Hash(),
Config: chain.Config(),
Head: chain.CurrentHeader().Hash(),
CHT: c.latestLocalCheckpoint(),
Difficulty: chain.GetTd(hash, head.Number.Uint64()),
SnailGenesis: chain.Genesis().Hash(),
SnailConfig: chain.Config(),
SnailHead: hash,
}
}
// 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.getLocalCheckpoint(sections-1, sections2-1)
}
// getLocalCheckpoint 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) getLocalCheckpoint(index, bIndex uint64) params.TrustedCheckpoint {
sectionHead := c.chtIndexer.SectionHead(index)
bloomHead := c.bloomTrieIndexer.SectionHead(bIndex)
return params.TrustedCheckpoint{
SectionIndex: index,
SectionHead: sectionHead,
CHTRoot: light.GetChtRoot(c.chainDb, index, sectionHead),
BloomRoot: fast.GetBloomTrieRoot(c.chainDb, bIndex, bloomHead),
}
}