github.com/yuanzimu/bsc@v1.1.4/eth/gasprice/gasprice_test.go (about)

     1  // Copyright 2020 The go-ethereum Authors
     2  // This file is part of the go-ethereum library.
     3  //
     4  // The go-ethereum library is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU Lesser General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // The go-ethereum library is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU Lesser General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU Lesser General Public License
    15  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package gasprice
    18  
    19  import (
    20  	"context"
    21  	"math"
    22  	"math/big"
    23  	"testing"
    24  
    25  	"github.com/ethereum/go-ethereum/common"
    26  	"github.com/ethereum/go-ethereum/consensus/ethash"
    27  	"github.com/ethereum/go-ethereum/core"
    28  	"github.com/ethereum/go-ethereum/core/rawdb"
    29  	"github.com/ethereum/go-ethereum/core/types"
    30  	"github.com/ethereum/go-ethereum/core/vm"
    31  	"github.com/ethereum/go-ethereum/crypto"
    32  	"github.com/ethereum/go-ethereum/params"
    33  	"github.com/ethereum/go-ethereum/rpc"
    34  )
    35  
    36  type testBackend struct {
    37  	chain *core.BlockChain
    38  }
    39  
    40  func (b *testBackend) HeaderByNumber(ctx context.Context, number rpc.BlockNumber) (*types.Header, error) {
    41  	if number == rpc.LatestBlockNumber {
    42  		return b.chain.CurrentBlock().Header(), nil
    43  	}
    44  	return b.chain.GetHeaderByNumber(uint64(number)), nil
    45  }
    46  
    47  func (b *testBackend) BlockByNumber(ctx context.Context, number rpc.BlockNumber) (*types.Block, error) {
    48  	if number == rpc.LatestBlockNumber {
    49  		return b.chain.CurrentBlock(), nil
    50  	}
    51  	return b.chain.GetBlockByNumber(uint64(number)), nil
    52  }
    53  
    54  func (b *testBackend) ChainConfig() *params.ChainConfig {
    55  	return b.chain.Config()
    56  }
    57  
    58  func newTestBackend(t *testing.T) *testBackend {
    59  	var (
    60  		key, _ = crypto.HexToECDSA("b71c71a67e1177ad4e901695e1b4b9ee17ae16c6668d313eac2f96dbcda3f291")
    61  		addr   = crypto.PubkeyToAddress(key.PublicKey)
    62  		gspec  = &core.Genesis{
    63  			Config: params.TestChainConfig,
    64  			Alloc:  core.GenesisAlloc{addr: {Balance: big.NewInt(math.MaxInt64)}},
    65  		}
    66  		signer = types.LatestSigner(gspec.Config)
    67  	)
    68  	engine := ethash.NewFaker()
    69  	db := rawdb.NewMemoryDatabase()
    70  	genesis, _ := gspec.Commit(db)
    71  
    72  	// Generate testing blocks
    73  	blocks, _ := core.GenerateChain(params.TestChainConfig, genesis, engine, db, 32, func(i int, b *core.BlockGen) {
    74  		b.SetCoinbase(common.Address{1})
    75  		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)
    76  		if err != nil {
    77  			t.Fatalf("failed to create tx: %v", err)
    78  		}
    79  		b.AddTx(tx)
    80  	})
    81  	// Construct testing chain
    82  	diskdb := rawdb.NewMemoryDatabase()
    83  	gspec.Commit(diskdb)
    84  	chain, err := core.NewBlockChain(diskdb, nil, params.TestChainConfig, engine, vm.Config{}, nil, nil)
    85  	if err != nil {
    86  		t.Fatalf("Failed to create local chain, %v", err)
    87  	}
    88  	chain.InsertChain(blocks)
    89  	return &testBackend{chain: chain}
    90  }
    91  
    92  func (b *testBackend) CurrentHeader() *types.Header {
    93  	return b.chain.CurrentHeader()
    94  }
    95  
    96  func (b *testBackend) GetBlockByNumber(number uint64) *types.Block {
    97  	return b.chain.GetBlockByNumber(number)
    98  }
    99  
   100  func TestSuggestPrice(t *testing.T) {
   101  	config := Config{
   102  		Blocks:     3,
   103  		Percentile: 60,
   104  		Default:    big.NewInt(params.GWei),
   105  	}
   106  	backend := newTestBackend(t)
   107  	oracle := NewOracle(backend, config)
   108  
   109  	// The gas price sampled is: 32G, 31G, 30G, 29G, 28G, 27G
   110  	got, err := oracle.SuggestPrice(context.Background())
   111  	if err != nil {
   112  		t.Fatalf("Failed to retrieve recommended gas price: %v", err)
   113  	}
   114  	expect := big.NewInt(params.GWei * int64(30))
   115  	if got.Cmp(expect) != 0 {
   116  		t.Fatalf("Gas price mismatch, want %d, got %d", expect, got)
   117  	}
   118  }