plugeth/les/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 (
"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/ethclient"
"github.com/ethereum/go-ethereum/ethdb"
"github.com/ethereum/go-ethereum/les/checkpointoracle"
"github.com/ethereum/go-ethereum/light"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/node"
"github.com/ethereum/go-ethereum/p2p"
all: new p2p node representation (#17643) Package p2p/enode provides a generalized representation of p2p nodes which can contain arbitrary information in key/value pairs. It is also the new home for the node database. The "v4" identity scheme is also moved here from p2p/enr to remove the dependency on Ethereum crypto from that package. Record signature handling is changed significantly. The identity scheme registry is removed and acceptable schemes must be passed to any method that needs identity. This means records must now be validated explicitly after decoding. The enode API is designed to make signature handling easy and safe: most APIs around the codebase work with enode.Node, which is a wrapper around a valid record. Going from enr.Record to enode.Node requires a valid signature. * p2p/discover: port to p2p/enode This ports the discovery code to the new node representation in p2p/enode. The wire protocol is unchanged, this can be considered a refactoring change. The Kademlia table can now deal with nodes using an arbitrary identity scheme. This requires a few incompatible API changes: - Table.Lookup is not available anymore. It used to take a public key as argument because v4 protocol requires one. Its replacement is LookupRandom. - Table.Resolve takes *enode.Node instead of NodeID. This is also for v4 protocol compatibility because nodes cannot be looked up by ID alone. - Types Node and NodeID are gone. Further commits in the series will be fixes all over the the codebase to deal with those removals. * p2p: port to p2p/enode and discovery changes This adapts package p2p to the changes in p2p/discover. All uses of discover.Node and discover.NodeID are replaced by their equivalents from p2p/enode. New API is added to retrieve the enode.Node instance of a peer. The behavior of Server.Self with discovery disabled is improved. It now tries much harder to report a working IP address, falling back to 127.0.0.1 if no suitable address can be determined through other means. These changes were needed for tests of other packages later in the series. * p2p/simulations, p2p/testing: port to p2p/enode No surprises here, mostly replacements of discover.Node, discover.NodeID with their new equivalents. The 'interesting' API changes are: - testing.ProtocolSession tracks complete nodes, not just their IDs. - adapters.NodeConfig has a new method to create a complete node. These changes were needed to make swarm tests work. Note that the NodeID change makes the code incompatible with old simulation snapshots. * whisper/whisperv5, whisper/whisperv6: port to p2p/enode This port was easy because whisper uses []byte for node IDs and URL strings in the API. * eth: port to p2p/enode Again, easy to port because eth uses strings for node IDs and doesn't care about node information in any way. * les: port to p2p/enode Apart from replacing discover.NodeID with enode.ID, most changes are in the server pool code. It now deals with complete nodes instead of (Pubkey, IP, Port) triples. The database format is unchanged for now, but we should probably change it to use the node database later. * node: port to p2p/enode This change simply replaces discover.Node and discover.NodeID with their new equivalents. * swarm/network: port to p2p/enode Swarm has its own node address representation, BzzAddr, containing both an overlay address (the hash of a secp256k1 public key) and an underlay address (enode:// URL). There are no changes to the BzzAddr format in this commit, but certain operations such as creating a BzzAddr from a node ID are now impossible because node IDs aren't public keys anymore. Most swarm-related changes in the series remove uses of NewAddrFromNodeID, replacing it with NewAddr which takes a complete node as argument. ToOverlayAddr is removed because we can just use the node ID directly.
2018-09-24 22:59:00 +00:00
"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...))
}
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
chainReader chainReader
chtIndexer, bloomTrieIndexer *core.ChainIndexer
oracle *checkpointoracle.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{}, dialCandidates enode.Iterator) []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,
DialCandidates: dialCandidates,
}
}
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),
}
}
// setupOracle sets up the checkpoint oracle contract client.
func (c *lesCommons) setupOracle(node *node.Node, genesis common.Hash, ethconfig *eth.Config) *checkpointoracle.CheckpointOracle {
config := ethconfig.CheckpointOracle
if config == nil {
// Try loading default config.
config = params.CheckpointOracles[genesis]
}
if config == nil {
log.Info("Checkpoint oracle is not enabled")
return nil
}
if config.Address == (common.Address{}) || uint64(len(config.Signers)) < config.Threshold {
log.Warn("Invalid checkpoint oracle config")
return nil
}
oracle := checkpointoracle.New(config, c.localCheckpoint)
rpcClient, _ := node.Attach()
client := ethclient.NewClient(rpcClient)
oracle.Start(client)
log.Info("Configured checkpoint oracle", "address", config.Address, "signers", len(config.Signers), "threshold", config.Threshold)
return oracle
}