1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
|
// Copyright 2015 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 gasprice
import (
"context"
"math/big"
"sort"
"sync"
"github.com/ava-labs/coreth/core/types"
"github.com/ava-labs/coreth/params"
"github.com/ava-labs/coreth/rpc"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/log"
)
const sampleNumber = 3 // Number of transactions sampled in a block
var DefaultMaxPrice = big.NewInt(500 * params.GWei)
type Config struct {
Blocks int
Percentile int
Default *big.Int `toml:",omitempty"`
MaxPrice *big.Int `toml:",omitempty"`
}
// OracleBackend includes all necessary background APIs for oracle.
type OracleBackend interface {
HeaderByNumber(ctx context.Context, number rpc.BlockNumber) (*types.Header, error)
BlockByNumber(ctx context.Context, number rpc.BlockNumber) (*types.Block, error)
ChainConfig() *params.ChainConfig
}
// Oracle recommends gas prices based on the content of recent
// blocks. Suitable for both light and full clients.
type Oracle struct {
backend OracleBackend
lastHead common.Hash
lastPrice *big.Int
maxPrice *big.Int
cacheLock sync.RWMutex
fetchLock sync.Mutex
checkBlocks int
percentile int
}
// NewOracle returns a new gasprice oracle which can recommend suitable
// gasprice for newly created transaction.
func NewOracle(backend OracleBackend, params Config) *Oracle {
blocks := params.Blocks
if blocks < 1 {
blocks = 1
log.Warn("Sanitizing invalid gasprice oracle sample blocks", "provided", params.Blocks, "updated", blocks)
}
percent := params.Percentile
if percent < 0 {
percent = 0
log.Warn("Sanitizing invalid gasprice oracle sample percentile", "provided", params.Percentile, "updated", percent)
}
if percent > 100 {
percent = 100
log.Warn("Sanitizing invalid gasprice oracle sample percentile", "provided", params.Percentile, "updated", percent)
}
maxPrice := params.MaxPrice
if maxPrice == nil || maxPrice.Int64() <= 0 {
maxPrice = DefaultMaxPrice
log.Warn("Sanitizing invalid gasprice oracle price cap", "provided", params.MaxPrice, "updated", maxPrice)
}
return &Oracle{
backend: backend,
lastPrice: params.Default,
maxPrice: maxPrice,
checkBlocks: blocks,
percentile: percent,
}
}
// SuggestPrice returns a gasprice so that newly created transaction can
// have a very high chance to be included in the following blocks.
func (gpo *Oracle) SuggestPrice(ctx context.Context) (*big.Int, error) {
return params.MinGasPrice, nil
}
type getBlockPricesResult struct {
prices []*big.Int
err error
}
type transactionsByGasPrice []*types.Transaction
func (t transactionsByGasPrice) Len() int { return len(t) }
func (t transactionsByGasPrice) Swap(i, j int) { t[i], t[j] = t[j], t[i] }
func (t transactionsByGasPrice) Less(i, j int) bool { return t[i].GasPriceCmp(t[j]) < 0 }
// getBlockPrices calculates the lowest transaction gas price in a given block
// and sends it to the result channel. If the block is empty or all transactions
// are sent by the miner itself(it doesn't make any sense to include this kind of
// transaction prices for sampling), nil gasprice is returned.
func (gpo *Oracle) getBlockPrices(ctx context.Context, signer types.Signer, blockNum uint64, limit int, result chan getBlockPricesResult, quit chan struct{}) {
block, err := gpo.backend.BlockByNumber(ctx, rpc.BlockNumber(blockNum))
if block == nil {
select {
case result <- getBlockPricesResult{nil, err}:
case <-quit:
}
return
}
blockTxs := block.Transactions()
txs := make([]*types.Transaction, len(blockTxs))
copy(txs, blockTxs)
sort.Sort(transactionsByGasPrice(txs))
var prices []*big.Int
for _, tx := range txs {
sender, err := types.Sender(signer, tx)
if err == nil && sender != block.Coinbase() {
prices = append(prices, tx.GasPrice())
if len(prices) >= limit {
break
}
}
}
select {
case result <- getBlockPricesResult{prices, nil}:
case <-quit:
}
}
type bigIntArray []*big.Int
func (s bigIntArray) Len() int { return len(s) }
func (s bigIntArray) Less(i, j int) bool { return s[i].Cmp(s[j]) < 0 }
func (s bigIntArray) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
|