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
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
|
package core
import (
"bytes"
"math"
"math/big"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/ethutil"
"github.com/ethereum/go-ethereum/state"
)
type AccountChange struct {
Address, StateAddress []byte
}
// Filtering interface
type Filter struct {
eth EthManager
earliest int64
latest int64
skip int
from, to [][]byte
max int
Altered []AccountChange
BlockCallback func(*types.Block)
MessageCallback func(state.Messages)
}
// Create a new filter which uses a bloom filter on blocks to figure out whether a particular block
// is interesting or not.
func NewFilter(eth EthManager) *Filter {
return &Filter{eth: eth}
}
func (self *Filter) AddAltered(address, stateAddress []byte) {
self.Altered = append(self.Altered, AccountChange{address, stateAddress})
}
// Set the earliest and latest block for filtering.
// -1 = latest block (i.e., the current block)
// hash = particular hash from-to
func (self *Filter) SetEarliestBlock(earliest int64) {
self.earliest = earliest
}
func (self *Filter) SetLatestBlock(latest int64) {
self.latest = latest
}
func (self *Filter) SetFrom(addr [][]byte) {
self.from = addr
}
func (self *Filter) AddFrom(addr []byte) {
self.from = append(self.from, addr)
}
func (self *Filter) SetTo(addr [][]byte) {
self.to = addr
}
func (self *Filter) AddTo(addr []byte) {
self.to = append(self.to, addr)
}
func (self *Filter) SetMax(max int) {
self.max = max
}
func (self *Filter) SetSkip(skip int) {
self.skip = skip
}
// Run filters messages with the current parameters set
func (self *Filter) Find() []*state.Message {
var earliestBlockNo uint64 = uint64(self.earliest)
if self.earliest == -1 {
earliestBlockNo = self.eth.ChainManager().CurrentBlock.Number.Uint64()
}
var latestBlockNo uint64 = uint64(self.latest)
if self.latest == -1 {
latestBlockNo = self.eth.ChainManager().CurrentBlock.Number.Uint64()
}
var (
messages []*state.Message
block = self.eth.ChainManager().GetBlockByNumber(latestBlockNo)
quit bool
)
for i := 0; !quit && block != nil; i++ {
// Quit on latest
switch {
case block.Number.Uint64() == earliestBlockNo, block.Number.Uint64() == 0:
quit = true
case self.max <= len(messages):
break
}
// Use bloom filtering to see if this block is interesting given the
// current parameters
if self.bloomFilter(block) {
// Get the messages of the block
msgs, err := self.eth.BlockManager().GetMessages(block)
if err != nil {
chainlogger.Warnln("err: filter get messages ", err)
break
}
messages = append(messages, self.FilterMessages(msgs)...)
}
block = self.eth.ChainManager().GetBlock(block.PrevHash)
}
skip := int(math.Min(float64(len(messages)), float64(self.skip)))
return messages[skip:]
}
func includes(addresses [][]byte, a []byte) (found bool) {
for _, addr := range addresses {
if bytes.Compare(addr, a) == 0 {
return true
}
}
return
}
func (self *Filter) FilterMessages(msgs []*state.Message) []*state.Message {
var messages []*state.Message
// Filter the messages for interesting stuff
for _, message := range msgs {
if len(self.to) > 0 && !includes(self.to, message.To) {
continue
}
if len(self.from) > 0 && !includes(self.from, message.From) {
continue
}
var match bool
if len(self.Altered) == 0 {
match = true
}
for _, accountChange := range self.Altered {
if len(accountChange.Address) > 0 && bytes.Compare(message.To, accountChange.Address) != 0 {
continue
}
if len(accountChange.StateAddress) > 0 && !includes(message.ChangedAddresses, accountChange.StateAddress) {
continue
}
match = true
break
}
if !match {
continue
}
messages = append(messages, message)
}
return messages
}
func (self *Filter) bloomFilter(block *types.Block) bool {
var fromIncluded, toIncluded bool
if len(self.from) > 0 {
for _, from := range self.from {
if types.BloomLookup(block.LogsBloom, from) || bytes.Equal(block.Coinbase, from) {
fromIncluded = true
break
}
}
} else {
fromIncluded = true
}
if len(self.to) > 0 {
for _, to := range self.to {
if types.BloomLookup(block.LogsBloom, ethutil.U256(new(big.Int).Add(ethutil.Big1, ethutil.BigD(to))).Bytes()) || bytes.Equal(block.Coinbase, to) {
toIncluded = true
break
}
}
} else {
toIncluded = true
}
return fromIncluded && toIncluded
}
|
