path: root/cmd/zoo/monkey/monkey.go

// Copyright 2018 The dexon-consensus Authors
// This file is part of the dexon-consensus library.
//
// The dexon-consensus 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 dexon-consensus 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 dexon-consensus library. If not, see
// <http://www.gnu.org/licenses/>.

// A simple monkey that sends random transactions into the network.

package monkey

import (
    "context"
    "crypto/ecdsa"
    "fmt"
    "math"
    "math/big"
    "math/rand"
    "time"

    dexon "github.com/dexon-foundation/dexon"
    "github.com/dexon-foundation/dexon/common"
    "github.com/dexon-foundation/dexon/core/types"
    "github.com/dexon-foundation/dexon/crypto"
    "github.com/dexon-foundation/dexon/ethclient"
)

var config *MonkeyConfig

type MonkeyConfig struct {
    Key      string
    Endpoint string
    N        int
    Gambler  bool
    Feeder   bool
    Batch    bool
    Sleep    int
    Timeout  int
}

func Init(cfg *MonkeyConfig) {
    config = cfg
}

type Monkey struct {
    client    *ethclient.Client
    source    *ecdsa.PrivateKey
    keys      []*ecdsa.PrivateKey
    networkID *big.Int
    timer     <-chan time.Time
}

func New(ep string, source *ecdsa.PrivateKey, num int, timeout time.Duration) *Monkey {
    client, err := ethclient.Dial(ep)
    if err != nil {
        panic(err)
    }

    var keys []*ecdsa.PrivateKey

    for i := 0; i < num; i++ {
        key, err := crypto.GenerateKey()
        if err != nil {
            panic(err)
        }
        keys = append(keys, key)
    }

    networkID, err := client.NetworkID(context.Background())
    if err != nil {
        panic(err)
    }

    monkey := &Monkey{
        client:    client,
        source:    source,
        keys:      keys,
        networkID: networkID,
    }

    if timeout > 0 {
        monkey.timer = time.After(timeout * time.Second)
    }

    return monkey
}

type transferContext struct {
    Key       *ecdsa.PrivateKey
    ToAddress common.Address
    Amount    *big.Int
    Data      []byte
    Nonce     uint64
    Gas       uint64
}

func (m *Monkey) prepareTx(ctx *transferContext) *types.Transaction {
    if ctx.Nonce == math.MaxUint64 {
        var err error
        address := crypto.PubkeyToAddress(ctx.Key.PublicKey)
        ctx.Nonce, err = m.client.PendingNonceAt(context.Background(), address)
        if err != nil {
            panic(err)
        }
    }

    if ctx.Gas == uint64(0) {
        var err error
        ctx.Gas, err = m.client.EstimateGas(context.Background(), dexon.CallMsg{
            Data: ctx.Data,
        })
        if err != nil {
            panic(err)
        }
    }

    tx := types.NewTransaction(
        ctx.Nonce,
        ctx.ToAddress,
        ctx.Amount,
        ctx.Gas,
        big.NewInt(1e9),
        ctx.Data)

    signer := types.NewEIP155Signer(m.networkID)
    tx, err := types.SignTx(tx, signer, ctx.Key)
    if err != nil {
        panic(err)
    }

    return tx
}

func (m *Monkey) transfer(ctx *transferContext) {
    tx := m.prepareTx(ctx)

    err := m.client.SendTransaction(context.Background(), tx)
    if err != nil {
        panic(err)
    }
}

func (m *Monkey) batchTransfer(ctxs []*transferContext) {
    txs := make([]*types.Transaction, len(ctxs))
    for i, ctx := range ctxs {
        txs[i] = m.prepareTx(ctx)
    }

    err := m.client.SendTransactions(context.Background(), txs)
    if err != nil {
        panic(err)
    }
}

func (m *Monkey) deploy(
    key *ecdsa.PrivateKey, code string, ctors []string, amount *big.Int, nonce uint64) common.Address {

    address := crypto.PubkeyToAddress(key.PublicKey)
    if nonce == math.MaxUint64 {
        var err error
        nonce, err = m.client.PendingNonceAt(context.Background(), address)
        if err != nil {
            panic(err)
        }
    }

    var input string
    for _, ctor := range ctors {
        input += fmt.Sprintf("%064s", ctor)
    }
    data := common.Hex2Bytes(code + input)

    gas, err := m.client.EstimateGas(context.Background(), dexon.CallMsg{
        From: address,
        Data: data,
    })
    if err != nil {
        panic(err)
    }

    tx := types.NewContractCreation(
        nonce,
        amount,
        gas,
        big.NewInt(1e9),
        data)

    signer := types.NewEIP155Signer(m.networkID)
    tx, err = types.SignTx(tx, signer, key)
    if err != nil {
        panic(err)
    }

    fmt.Println("Sending TX", "fullhash", tx.Hash().String())

    err = m.client.SendTransaction(context.Background(), tx)
    if err != nil {
        panic(err)
    }

    for {
        time.Sleep(500 * time.Millisecond)
        recp, err := m.client.TransactionReceipt(context.Background(), tx.Hash())
        if err != nil {
            if err == dexon.NotFound {
                continue
            }
            panic(err)
        }
        return recp.ContractAddress
    }
}

func (m *Monkey) Distribute() {
    fmt.Println("Distributing DEX to random accounts ...")
    address := crypto.PubkeyToAddress(m.source.PublicKey)
    nonce, err := m.client.PendingNonceAt(context.Background(), address)
    if err != nil {
        panic(err)
    }

    ctxs := make([]*transferContext, len(m.keys))
    for i, key := range m.keys {
        address := crypto.PubkeyToAddress(key.PublicKey)
        amount := new(big.Int)
        amount.SetString("100000000000000000000", 10)
        ctxs[i] = &transferContext{
            Key:       m.source,
            ToAddress: address,
            Amount:    amount,
            Nonce:     nonce,
            Gas:       21000,
        }
        nonce += 1
    }
    m.batchTransfer(ctxs)
    time.Sleep(20 * time.Second)
}

func (m *Monkey) Crazy() uint64 {
    fmt.Println("Performing random transfers ...")
    nonce := uint64(0)
loop:
    for {
        ctxs := make([]*transferContext, len(m.keys))
        for i, key := range m.keys {
            to := crypto.PubkeyToAddress(m.keys[rand.Int()%len(m.keys)].PublicKey)
            amount := new(big.Int)
            amount.SetString(fmt.Sprintf("%d000000000000000", rand.Intn(10)+1), 10)
            ctx := &transferContext{
                Key:       key,
                ToAddress: to,
                Amount:    amount,
                Nonce:     nonce,
                Gas:       21000,
            }
            if config.Batch {
                ctxs[i] = ctx
            } else {
                m.transfer(ctx)
            }
        }
        if config.Batch {
            m.batchTransfer(ctxs)
        }
        fmt.Printf("Sent %d transactions, nonce = %d\n", len(m.keys), nonce)

        if m.timer != nil {
            select {
            case <-m.timer:
                break loop
            default:
            }
        }

        nonce += 1
        time.Sleep(time.Duration(config.Sleep) * time.Millisecond)
    }

    return nonce
}

func (m *Monkey) Keys() []*ecdsa.PrivateKey {
    return m.keys
}

func Exec() (*Monkey, uint64) {
    privKey, err := crypto.LoadECDSA(config.Key)
    if err != nil {
        panic(err)
    }

    m := New(config.Endpoint, privKey, config.N, time.Duration(config.Timeout))
    m.Distribute()
    var finalNonce uint64
    if config.Gambler {
        finalNonce = m.Gamble()
    } else if config.Feeder {
        finalNonce = m.Feed()
    } else {
        finalNonce = m.Crazy()
    }

    return m, finalNonce
}