// Copyright 2016 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/>.
// Contains all the wrappers from the node package to support client side node
// management on mobile platforms.
package geth
import (
"encoding/json"
"fmt"
"path/filepath"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/eth"
"github.com/ethereum/go-ethereum/eth/downloader"
"github.com/ethereum/go-ethereum/ethclient"
"github.com/ethereum/go-ethereum/ethstats"
"github.com/ethereum/go-ethereum/les"
"github.com/ethereum/go-ethereum/node"
"github.com/ethereum/go-ethereum/p2p"
"github.com/ethereum/go-ethereum/p2p/nat"
"github.com/ethereum/go-ethereum/params"
whisper "github.com/ethereum/go-ethereum/whisper/whisperv5"
)
// NodeConfig represents the collection of configuration values to fine tune the Geth
// node embedded into a mobile process. The available values are a subset of the
// entire API provided by go-ethereum to reduce the maintenance surface and dev
// complexity.
type NodeConfig struct {
// Bootstrap nodes used to establish connectivity with the rest of the network.
BootstrapNodes *Enodes
// MaxPeers is the maximum number of peers that can be connected. If this is
// set to zero, then only the configured static and trusted peers can connect.
MaxPeers int
// EthereumEnabled specifies whether the node should run the Ethereum protocol.
EthereumEnabled bool
// EthereumNetworkID is the network identifier used by the Ethereum protocol to
// decide if remote peers should be accepted or not.
EthereumNetworkID int64 // uint64 in truth, but Java can't handle that...
// EthereumGenesis is the genesis JSON to use to seed the blockchain with. An
// empty genesis state is equivalent to using the mainnet's state.
EthereumGenesis string
// EthereumDatabaseCache is the system memory in MB to allocate for database caching.
// A minimum of 16MB is always reserved.
EthereumDatabaseCache int
// EthereumNetStats is a netstats connection string to use to report various
// chain, transaction and node stats to a monitoring server.
//
// It has the form "nodename:secret@host:port"
EthereumNetStats string
// WhisperEnabled specifies whether the node should run the Whisper protocol.
WhisperEnabled bool
}
// defaultNodeConfig contains the default node configuration values to use if all
// or some fields are missing from the user's specified list.
var defaultNodeConfig = &NodeConfig{
BootstrapNodes: FoundationBootnodes(),
MaxPeers: 25,
EthereumEnabled: true,
EthereumNetworkID: 1,
EthereumDatabaseCache: 16,
}
// NewNodeConfig creates a new node option set, initialized to the default values.
func NewNodeConfig() *NodeConfig {
config := *defaultNodeConfig
return &config
}
// Node represents a Geth Ethereum node instance.
type Node struct {
node *node.Node
}
// NewNode creates and configures a new Geth node.
func NewNode(datadir string, config *NodeConfig) (stack *Node, _ error) {
// If no or partial configurations were specified, use defaults
if config == nil {
config = NewNodeConfig()
}
if config.MaxPeers == 0 {
config.MaxPeers = defaultNodeConfig.MaxPeers
}
if config.BootstrapNodes == nil || config.BootstrapNodes.Size() == 0 {
config.BootstrapNodes = defaultNodeConfig.BootstrapNodes
}
// Create the empty networking stack
nodeConf := &node.Config{
Name: clientIdentifier,
Version: params.Version,
DataDir: datadir,
KeyStoreDir: filepath.Join(datadir, "keystore"), // Mobile should never use internal keystores!
P2P: p2p.Config{
NoDiscovery: true,
DiscoveryV5: true,
DiscoveryV5Addr: ":0",
BootstrapNodesV5: config.BootstrapNodes.nodes,
ListenAddr: ":0",
NAT: nat.Any(),
MaxPeers: config.MaxPeers,
},
}
rawStack, err := node.New(nodeConf)
if err != nil {
return nil, err
}
var genesis *core.Genesis
if config.EthereumGenesis != "" {
// Parse the user supplied genesis spec if not mainnet
genesis = new(core.Genesis)
if err := json.Unmarshal([]byte(config.EthereumGenesis), genesis); err != nil {
return nil, fmt.Errorf("invalid genesis spec: %v", err)
}
// If we have the testnet, hard code the chain configs too
if config.EthereumGenesis == TestnetGenesis() {
genesis.Config = params.TestnetChainConfig
if config.EthereumNetworkID == 1 {
config.EthereumNetworkID = 3
}
}
}
// Register the Ethereum protocol if requested
if config.EthereumEnabled {
ethConf := eth.DefaultConfig
ethConf.Genesis = genesis
ethConf.SyncMode = downloader.LightSync
ethConf.NetworkId = uint64(config.EthereumNetworkID)
ethConf.DatabaseCache = config.EthereumDatabaseCache
if err := rawStack.Register(func(ctx *node.ServiceContext) (node.Service, error) {
return les.New(ctx, ðConf)
}); err != nil {
return nil, fmt.Errorf("ethereum init: %v", err)
}
// If netstats reporting is requested, do it
if config.EthereumNetStats != "" {
if err := rawStack.Register(func(ctx *node.ServiceContext) (node.Service, error) {
var lesServ *les.LightEthereum
ctx.Service(&lesServ)
return ethstats.New(config.EthereumNetStats, nil, lesServ)
}); err != nil {
return nil, fmt.Errorf("netstats init: %v", err)
}
}
}
// Register the Whisper protocol if requested
if config.WhisperEnabled {
if err := rawStack.Register(func(*node.ServiceContext) (node.Service, error) { return whisper.New(), nil }); err != nil {
return nil, fmt.Errorf("whisper init: %v", err)
}
}
return &Node{rawStack}, nil
}
// Start creates a live P2P node and starts running it.
func (n *Node) Start() error {
return n.node.Start()
}
// Stop terminates a running node along with all it's services. In the node was
// not started, an error is returned.
func (n *Node) Stop() error {
return n.node.Stop()
}
// GetEthereumClient retrieves a client to access the Ethereum subsystem.
func (n *Node) GetEthereumClient() (client *EthereumClient, _ error) {
rpc, err := n.node.Attach()
if err != nil {
return nil, err
}
return &EthereumClient{ethclient.NewClient(rpc)}, nil
}
// GetNodeInfo gathers and returns a collection of metadata known about the host.
func (n *Node) GetNodeInfo() *NodeInfo {
return &NodeInfo{n.node.Server().NodeInfo()}
}
// GetPeersInfo returns an array of metadata objects describing connected peers.
func (n *Node) GetPeersInfo() *PeerInfos {
return &PeerInfos{n.node.Server().PeersInfo()}
}
