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node.go
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node.go
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package testchain
import (
"crypto/ecdsa"
"math/big"
"github.com/ethereum/go-ethereum/consensus/ethash"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/eth"
"github.com/ethereum/go-ethereum/ethclient"
"github.com/ethereum/go-ethereum/node"
"github.com/ethereum/go-ethereum/params"
)
type Backend struct {
Node *node.Node
Client *ethclient.Client
genesis *core.Genesis
Ethereum *eth.Ethereum
Faucet *ecdsa.PrivateKey
Signer types.Signer
}
func NewBackend() (*Backend, error) {
faucet, err := crypto.GenerateKey()
if err != nil {
return nil, err
}
config := params.AllEthashProtocolChanges
genesis := &core.Genesis{
Config: config,
Alloc: core.GenesisAlloc{crypto.PubkeyToAddress(faucet.PublicKey): {Balance: big.NewInt(1e18)}},
ExtraData: []byte("test genesis"),
Timestamp: 9000,
}
var ethservice *eth.Ethereum
n, err := node.New(&node.Config{})
if err != nil {
return nil, err
}
err = n.Register(func(ctx *node.ServiceContext) (node.Service, error) {
config := ð.Config{Genesis: genesis}
config.Ethash.PowMode = ethash.ModeFake
ethservice, err = eth.New(ctx, config)
return ethservice, err
})
if err != nil {
return nil, err
}
if err := n.Start(); err != nil {
return nil, err
}
client, err := n.Attach()
if err != nil {
return nil, err
}
return &Backend{
Node: n,
Client: ethclient.NewClient(client),
Ethereum: ethservice,
Faucet: faucet,
Signer: types.NewEIP155Signer(config.ChainID),
genesis: genesis,
}, nil
}
// GenerateBlocks generate n blocks starting from genesis.
func (b *Backend) GenerateBlocks(n int, start uint64, gen func(int, *core.BlockGen)) []*types.Block {
block := b.Ethereum.BlockChain().GetBlockByNumber(start)
engine := ethash.NewFaker()
blocks, _ := core.GenerateChain(b.genesis.Config, block, engine, b.Ethereum.ChainDb(), n, gen)
return blocks
}
func (b *Backend) Stop() error {
return b.Node.Stop()
}