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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/>.

// +build none

// This file contains a miner stress test based on the Ethash consensus engine.
package main

import (
    "crypto/ecdsa"
    "fmt"
    "io/ioutil"
    "math/big"
    "math/rand"
    "os"
    "path/filepath"
    "time"

    "github.com/ethereum/go-ethereum/accounts/keystore"
    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/common/fdlimit"
    "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/eth/downloader"
    "github.com/ethereum/go-ethereum/log"
    "github.com/ethereum/go-ethereum/node"
    "github.com/ethereum/go-ethereum/p2p"
    "github.com/ethereum/go-ethereum/p2p/discover"
    "github.com/ethereum/go-ethereum/params"
)

func main() {
    log.Root().SetHandler(log.LvlFilterHandler(log.LvlInfo, log.StreamHandler(os.Stderr, log.TerminalFormat(true))))
    fdlimit.Raise(2048)

    // Generate a batch of accounts to seal and fund with
    faucets := make([]*ecdsa.PrivateKey, 128)
    for i := 0; i < len(faucets); i++ {
        faucets[i], _ = crypto.GenerateKey()
    }
    // Pre-generate the ethash mining DAG so we don't race
    ethash.MakeDataset(1, filepath.Join(os.Getenv("HOME"), ".ethash"))

    // Create an Ethash network based off of the Ropsten config
    genesis := makeGenesis(faucets)

    var (
        nodes  []*node.Node
        enodes []string
    )
    for i := 0; i < 4; i++ {
        // Start the node and wait until it's up
        node, err := makeMiner(genesis, enodes)
        if err != nil {
            panic(err)
        }
        defer node.Stop()

        for node.Server().NodeInfo().Ports.Listener == 0 {
            time.Sleep(250 * time.Millisecond)
        }
        // Connect the node to al the previous ones
        for _, enode := range enodes {
            enode, err := discover.ParseNode(enode)
            if err != nil {
                panic(err)
            }
            node.Server().AddPeer(enode)
        }
        // Start tracking the node and it's enode url
        nodes = append(nodes, node)

        enode := fmt.Sprintf("enode://%s@127.0.0.1:%d", node.Server().NodeInfo().ID, node.Server().NodeInfo().Ports.Listener)
        enodes = append(enodes, enode)

        // Inject the signer key and start sealing with it
        store := node.AccountManager().Backends(keystore.KeyStoreType)[0].(*keystore.KeyStore)
        if _, err := store.NewAccount(""); err != nil {
            panic(err)
        }
    }
    // Iterate over all the nodes and start signing with them
    time.Sleep(3 * time.Second)

    for _, node := range nodes {
        var ethereum *eth.Ethereum
        if err := node.Service(&ethereum); err != nil {
            panic(err)
        }
        if err := ethereum.StartMining(1); err != nil {
            panic(err)
        }
    }
    time.Sleep(3 * time.Second)

    // Start injecting transactions from the faucets like crazy
    nonces := make([]uint64, len(faucets))
    for {
        index := rand.Intn(len(faucets))

        // Fetch the accessor for the relevant signer
        var ethereum *eth.Ethereum
        if err := nodes[index%len(nodes)].Service(&ethereum); err != nil {
            panic(err)
        }
        // Create a self transaction and inject into the pool
        tx, err := types.SignTx(types.NewTransaction(nonces[index], crypto.PubkeyToAddress(faucets[index].PublicKey), new(big.Int), 21000, big.NewInt(100000000000+rand.Int63n(65536)), nil), types.HomesteadSigner{}, faucets[index])
        if err != nil {
            panic(err)
        }
        if err := ethereum.TxPool().AddLocal(tx); err != nil {
            panic(err)
        }
        nonces[index]++

        // Wait if we're too saturated
        if pend, _ := ethereum.TxPool().Stats(); pend > 2048 {
            time.Sleep(100 * time.Millisecond)
        }
    }
}

// makeGenesis creates a custom Ethash genesis block based on some pre-defined
// faucet accounts.
func makeGenesis(faucets []*ecdsa.PrivateKey) *core.Genesis {
    genesis := core.DefaultTestnetGenesisBlock()
    genesis.Difficulty = params.MinimumDifficulty
    genesis.GasLimit = 25000000

    genesis.Config.ChainID = big.NewInt(18)
    genesis.Config.EIP150Hash = common.Hash{}

    genesis.Alloc = core.GenesisAlloc{}
    for _, faucet := range faucets {
        genesis.Alloc[crypto.PubkeyToAddress(faucet.PublicKey)] = core.GenesisAccount{
            Balance: new(big.Int).Exp(big.NewInt(2), big.NewInt(128), nil),
        }
    }
    return genesis
}

func makeMiner(genesis *core.Genesis, nodes []string) (*node.Node, error) {
    // Define the basic configurations for the Ethereum node
    datadir, _ := ioutil.TempDir("", "")

    config := &node.Config{
        Name:    "geth",
        Version: params.Version,
        DataDir: datadir,
        P2P: p2p.Config{
            ListenAddr:  "0.0.0.0:0",
            NoDiscovery: true,
            MaxPeers:    25,
        },
        NoUSB:             true,
        UseLightweightKDF: true,
    }
    // Start the node and configure a full Ethereum node on it
    stack, err := node.New(config)
    if err != nil {
        return nil, err
    }
    if err := stack.Register(func(ctx *node.ServiceContext) (node.Service, error) {
        return eth.New(ctx, &eth.Config{
            Genesis:         genesis,
            NetworkId:       genesis.Config.ChainID.Uint64(),
            SyncMode:        downloader.FullSync,
            DatabaseCache:   256,
            DatabaseHandles: 256,
            TxPool:          core.DefaultTxPoolConfig,
            GPO:             eth.DefaultConfig.GPO,
            Ethash:          eth.DefaultConfig.Ethash,
            MinerGasFloor:   genesis.GasLimit * 9 / 10,
            MinerGasCeil:    genesis.GasLimit * 11 / 10,
            MinerGasPrice:   big.NewInt(1),
            MinerRecommit:   time.Second,
        })
    }); err != nil {
        return nil, err
    }
    // Start the node and return if successful
    return stack, stack.Start()
}