synapsecns/sanguine

// Copyright 2020 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 londinium_test

import (
    "context"
    "math"
    "math/big"
    "testing"

    "github.com/ethereum/go-ethereum/trie"
    "github.com/synapsecns/sanguine/ethergo/chain/gas/londinium"

    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/consensus/ethash"
    "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/core/vm"
    "github.com/ethereum/go-ethereum/crypto"
    "github.com/ethereum/go-ethereum/params"
    "github.com/ethereum/go-ethereum/rpc"
    . "github.com/stretchr/testify/assert"
)

type testBackend struct {
    chain *core.BlockChain
}

func (b *testBackend) HeaderByNumber(ctx context.Context, number rpc.BlockNumber) (*types.Header, error) {
    if number == rpc.LatestBlockNumber {
        return b.chain.CurrentBlock(), nil
    }
    return b.chain.GetHeaderByNumber(uint64(number)), nil
}

func (b *testBackend) BlockByNumber(ctx context.Context, number rpc.BlockNumber) (*types.Block, error) {
    if number == rpc.LatestBlockNumber {
        return b.chain.GetBlockByHash(b.chain.CurrentBlock().Hash()), nil
    }
    return b.chain.GetBlockByNumber(uint64(number)), nil
}

func (b *testBackend) ChainConfig() *params.ChainConfig {
    return b.chain.Config()
}

func newTestBackend(t *testing.T) *testBackend {
    t.Helper()

    var (
        key, _ = crypto.HexToECDSA("b71c71a67e1177ad4e901695e1b4b9ee17ae16c6668d313eac2f96dbcda3f291")
        addr   = crypto.PubkeyToAddress(key.PublicKey)
        gspec  = &core.Genesis{
            Config: params.TestChainConfig,
            Alloc:  core.GenesisAlloc{addr: {Balance: big.NewInt(math.MaxInt64)}},
        }
        signer = types.LatestSigner(gspec.Config)
    )
    engine := ethash.NewFaker()
    db := rawdb.NewMemoryDatabase()
    triedb := trie.NewDatabase(db, nil)
    genesis, _ := gspec.Commit(db, triedb)

    // Generate testing blocks
    blocks, _ := core.GenerateChain(params.TestChainConfig, genesis, engine, db, 32, func(i int, b *core.BlockGen) {
        b.SetCoinbase(common.Address{1})
        tx, err := types.SignTx(types.NewTransaction(b.TxNonce(addr), common.HexToAddress("deadbeef"), big.NewInt(100), 21000, big.NewInt(int64(i+1)*params.GWei), nil), signer, key)
        if err != nil {
            t.Fatalf("failed to create tx: %v", err)
        }
        b.AddTx(tx)
    })
    // Construct testing chain
    diskdb := rawdb.NewMemoryDatabase()
    disktriedb := trie.NewDatabase(diskdb, nil)
    _, err := gspec.Commit(diskdb, disktriedb)
    Nil(t, err)

    chain, err := core.NewBlockChain(diskdb, nil, gspec, nil, engine, vm.Config{}, nil, nil)
    if err != nil {
        t.Fatalf("Failed to create local chain, %v", err)
    }
    _, err = chain.InsertChain(blocks)
    Nil(t, err)
    return &testBackend{chain: chain}
}

func (b *testBackend) CurrentHeader() *types.Header {
    return b.chain.CurrentHeader()
}

func (b *testBackend) GetBlockByNumber(number uint64) *types.Block {
    return b.chain.GetBlockByNumber(number)
}

func (l *LondoniumSuite) TestSuggestPrice() {
    config := londinium.Config{
        Blocks:     3,
        Percentile: 60,
        Default:    big.NewInt(params.GWei),
    }
    backend := newTestBackend(l.T())
    oracle := londinium.NewOracle(backend, config)

    // The gas price sampled is: 32G, 31G, 30G, 29G, 28G, 27G
    got, err := oracle.SuggestPrice(context.Background())
    if err != nil {
        l.T().Fatalf("Failed to retrieve recommended gas price: %v", err)
    }
    expect := big.NewInt(params.GWei * int64(30))
    if got.Cmp(expect) != 0 {
        l.T().Fatalf("Gas price mismatch, want %d, got %d", expect, got)
    }
}