plugeth/ethchain/filter.go

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package ethchain
import (
"bytes"
"fmt"
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"math"
"github.com/ethereum/eth-go/ethstate"
"github.com/ethereum/eth-go/ethutil"
"gopkg.in/qml.v1"
)
type data struct {
id, address []byte
}
// Filtering interface
type Filter struct {
eth EthManager
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earliest int64
latest int64
skip int
from, to [][]byte
max int
altered []data
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BlockCallback func(*Block)
MessageCallback func(ethstate.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}
}
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func NewFilterFromMap(object map[string]interface{}, eth EthManager) *Filter {
filter := NewFilter(eth)
if object["earliest"] != nil {
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val := ethutil.NewValue(object["earliest"])
filter.SetEarliestBlock(val.Int())
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}
if object["latest"] != nil {
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val := ethutil.NewValue(object["latest"])
filter.SetLatestBlock(val.Int())
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}
if object["to"] != nil {
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val := ethutil.NewValue(object["to"])
filter.AddTo(ethutil.Hex2Bytes(val.Str()))
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}
if object["from"] != nil {
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val := ethutil.NewValue(object["from"])
filter.AddFrom(ethutil.Hex2Bytes(val.Str()))
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}
if object["max"] != nil {
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val := ethutil.NewValue(object["max"])
filter.SetMax(int(val.Uint()))
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}
if object["skip"] != nil {
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val := ethutil.NewValue(object["skip"])
filter.SetSkip(int(val.Uint()))
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}
if object["altered"] != nil {
filter.altered = makeAltered(object["altered"])
}
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return filter
}
func (self *Filter) AddAltered(id, address []byte) {
self.altered = append(self.altered, data{id, address})
}
// Set the earliest and latest block for filtering.
// -1 = latest block (i.e., the current block)
// hash = particular hash from-to
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func (self *Filter) SetEarliestBlock(earliest int64) {
self.earliest = earliest
}
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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) {
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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() []*ethstate.Message {
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var earliestBlockNo uint64 = uint64(self.earliest)
if self.earliest == -1 {
earliestBlockNo = self.eth.BlockChain().CurrentBlock.Number.Uint64()
}
var latestBlockNo uint64 = uint64(self.latest)
if self.latest == -1 {
latestBlockNo = self.eth.BlockChain().CurrentBlock.Number.Uint64()
}
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var (
messages []*ethstate.Message
block = self.eth.BlockChain().GetBlockByNumber(latestBlockNo)
quit bool
)
for i := 0; !quit && block != nil; i++ {
// Quit on latest
switch {
case block.Number.Uint64() == earliestBlockNo:
quit = true
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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.StateManager().GetMessages(block)
if err != nil {
chainlogger.Warnln("err: filter get messages ", err)
break
}
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messages = append(messages, self.FilterMessages(msgs)...)
}
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block = self.eth.BlockChain().GetBlock(block.PrevHash)
}
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skip := int(math.Min(float64(len(messages)), float64(self.skip)))
return messages[skip:]
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}
func includes(addresses [][]byte, a []byte) (found bool) {
for _, addr := range addresses {
if bytes.Compare(addr, a) == 0 {
return true
}
}
return
}
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func (self *Filter) FilterMessages(msgs []*ethstate.Message) []*ethstate.Message {
var messages []*ethstate.Message
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// 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 _, item := range self.altered {
if len(item.id) > 0 && bytes.Compare(message.To, item.id) != 0 {
continue
}
if len(item.address) > 0 && !includes(message.ChangedAddresses, item.address) {
continue
}
match = true
break
}
if !match {
continue
}
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messages = append(messages, message)
}
return messages
}
func (self *Filter) bloomFilter(block *Block) bool {
fk := append([]byte("bloom"), block.Hash()...)
bin, err := self.eth.Db().Get(fk)
if err != nil {
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fmt.Println(err)
}
bloom := NewBloomFilter(bin)
var fromIncluded, toIncluded bool
if len(self.from) > 0 {
for _, from := range self.from {
if bloom.Search(from) {
fromIncluded = true
break
}
}
} else {
fromIncluded = true
}
if len(self.to) > 0 {
for _, to := range self.to {
if bloom.Search(to) {
toIncluded = true
break
}
}
} else {
toIncluded = true
}
return fromIncluded && toIncluded
}
// Conversion methodn
func mapToData(m map[string]interface{}) (d data) {
if str, ok := m["id"].(string); ok {
d.id = ethutil.Hex2Bytes(str)
}
if str, ok := m["at"].(string); ok {
d.address = ethutil.Hex2Bytes(str)
}
return
}
// data can come in in the following formats:
// ["aabbccdd", {id: "ccddee", at: "11223344"}], "aabbcc", {id: "ccddee", at: "1122"}
func makeAltered(v interface{}) (d []data) {
if str, ok := v.(string); ok {
d = append(d, data{ethutil.Hex2Bytes(str), nil})
} else if obj, ok := v.(map[string]interface{}); ok {
d = append(d, mapToData(obj))
} else if slice, ok := v.([]interface{}); ok {
for _, item := range slice {
d = append(d, makeAltered(item)...)
}
} else if qList, ok := v.(*qml.List); ok {
var s []interface{}
qList.Convert(&s)
fmt.Println(s)
d = makeAltered(s)
} else if qMap, ok := v.(*qml.Map); ok {
var m map[string]interface{}
qMap.Convert(&m)
fmt.Println(m)
d = makeAltered(m)
} else {
panic(fmt.Sprintf("makeAltered err (unknown conversion): %T\n", v))
}
return
}