mirror of
https://gitlab.com/pulsechaincom/go-pulse.git
synced 2024-12-25 12:57:17 +00:00
293 lines
6.0 KiB
Go
293 lines
6.0 KiB
Go
package ethchain
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import (
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"bytes"
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"fmt"
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"math"
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"github.com/ethereum/eth-go/ethstate"
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"github.com/ethereum/eth-go/ethutil"
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"gopkg.in/qml.v1"
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)
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type data struct {
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id, address []byte
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}
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// Filtering interface
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type Filter struct {
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eth EthManager
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earliest int64
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latest int64
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skip int
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from, to [][]byte
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max int
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altered []data
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BlockCallback func(*Block)
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MessageCallback func(ethstate.Messages)
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}
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// Create a new filter which uses a bloom filter on blocks to figure out whether a particular block
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// is interesting or not.
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func NewFilter(eth EthManager) *Filter {
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return &Filter{eth: eth}
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}
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func NewFilterFromMap(object map[string]interface{}, eth EthManager) *Filter {
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filter := NewFilter(eth)
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if object["earliest"] != nil {
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val := ethutil.NewValue(object["earliest"])
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filter.SetEarliestBlock(val.Int())
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}
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if object["latest"] != nil {
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val := ethutil.NewValue(object["latest"])
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filter.SetLatestBlock(val.Int())
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}
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if object["to"] != nil {
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val := ethutil.NewValue(object["to"])
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filter.AddTo(ethutil.Hex2Bytes(val.Str()))
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}
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if object["from"] != nil {
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val := ethutil.NewValue(object["from"])
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filter.AddFrom(ethutil.Hex2Bytes(val.Str()))
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}
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if object["max"] != nil {
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val := ethutil.NewValue(object["max"])
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filter.SetMax(int(val.Uint()))
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}
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if object["skip"] != nil {
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val := ethutil.NewValue(object["skip"])
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filter.SetSkip(int(val.Uint()))
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}
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if object["altered"] != nil {
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filter.altered = makeAltered(object["altered"])
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}
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return filter
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}
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func (self *Filter) AddAltered(id, address []byte) {
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self.altered = append(self.altered, data{id, address})
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}
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// Set the earliest and latest block for filtering.
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// -1 = latest block (i.e., the current block)
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// hash = particular hash from-to
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func (self *Filter) SetEarliestBlock(earliest int64) {
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self.earliest = earliest
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}
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func (self *Filter) SetLatestBlock(latest int64) {
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self.latest = latest
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}
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func (self *Filter) SetFrom(addr [][]byte) {
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self.from = addr
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}
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func (self *Filter) AddFrom(addr []byte) {
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self.from = append(self.from, addr)
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}
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func (self *Filter) SetTo(addr [][]byte) {
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self.to = addr
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}
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func (self *Filter) AddTo(addr []byte) {
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self.to = append(self.to, addr)
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}
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func (self *Filter) SetMax(max int) {
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self.max = max
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}
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func (self *Filter) SetSkip(skip int) {
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self.skip = skip
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}
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// Run filters messages with the current parameters set
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func (self *Filter) Find() []*ethstate.Message {
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var earliestBlockNo uint64 = uint64(self.earliest)
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if self.earliest == -1 {
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earliestBlockNo = self.eth.BlockChain().CurrentBlock.Number.Uint64()
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}
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var latestBlockNo uint64 = uint64(self.latest)
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if self.latest == -1 {
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latestBlockNo = self.eth.BlockChain().CurrentBlock.Number.Uint64()
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}
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var (
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messages []*ethstate.Message
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block = self.eth.BlockChain().GetBlockByNumber(latestBlockNo)
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quit bool
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)
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for i := 0; !quit && block != nil; i++ {
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// Quit on latest
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switch {
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case block.Number.Uint64() == earliestBlockNo:
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quit = true
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case self.max <= len(messages):
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break
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}
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// Use bloom filtering to see if this block is interesting given the
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// current parameters
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if self.bloomFilter(block) {
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// Get the messages of the block
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msgs, err := self.eth.StateManager().GetMessages(block)
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if err != nil {
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chainlogger.Warnln("err: filter get messages ", err)
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break
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}
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messages = append(messages, self.FilterMessages(msgs)...)
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}
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block = self.eth.BlockChain().GetBlock(block.PrevHash)
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}
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skip := int(math.Min(float64(len(messages)), float64(self.skip)))
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return messages[skip:]
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}
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func includes(addresses [][]byte, a []byte) (found bool) {
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for _, addr := range addresses {
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if bytes.Compare(addr, a) == 0 {
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return true
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}
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}
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return
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}
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func (self *Filter) FilterMessages(msgs []*ethstate.Message) []*ethstate.Message {
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var messages []*ethstate.Message
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// Filter the messages for interesting stuff
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for _, message := range msgs {
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if len(self.to) > 0 && !includes(self.to, message.To) {
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continue
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}
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if len(self.from) > 0 && !includes(self.from, message.From) {
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continue
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}
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var match bool
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if len(self.altered) == 0 {
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match = true
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}
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for _, item := range self.altered {
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if len(item.id) > 0 && bytes.Compare(message.To, item.id) != 0 {
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continue
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}
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if len(item.address) > 0 && !includes(message.ChangedAddresses, item.address) {
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continue
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}
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match = true
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break
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}
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if !match {
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continue
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}
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messages = append(messages, message)
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}
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return messages
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}
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func (self *Filter) bloomFilter(block *Block) bool {
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fk := append([]byte("bloom"), block.Hash()...)
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bin, err := self.eth.Db().Get(fk)
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if err != nil {
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panic(err)
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}
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bloom := NewBloomFilter(bin)
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var fromIncluded, toIncluded bool
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if len(self.from) > 0 {
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for _, from := range self.from {
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if bloom.Search(from) {
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fromIncluded = true
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break
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}
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}
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} else {
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fromIncluded = true
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}
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if len(self.to) > 0 {
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for _, to := range self.to {
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if bloom.Search(to) {
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toIncluded = true
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break
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}
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}
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} else {
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toIncluded = true
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}
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return fromIncluded && toIncluded
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}
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// Conversion methodn
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func mapToData(m map[string]interface{}) (d data) {
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if str, ok := m["id"].(string); ok {
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d.id = ethutil.Hex2Bytes(str)
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}
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if str, ok := m["at"].(string); ok {
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d.address = ethutil.Hex2Bytes(str)
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}
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return
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}
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// data can come in in the following formats:
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// ["aabbccdd", {id: "ccddee", at: "11223344"}], "aabbcc", {id: "ccddee", at: "1122"}
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func makeAltered(v interface{}) (d []data) {
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if str, ok := v.(string); ok {
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d = append(d, data{ethutil.Hex2Bytes(str), nil})
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} else if obj, ok := v.(map[string]interface{}); ok {
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d = append(d, mapToData(obj))
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} else if slice, ok := v.([]interface{}); ok {
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for _, item := range slice {
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d = append(d, makeAltered(item)...)
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}
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} else if qList, ok := v.(*qml.List); ok {
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var s []interface{}
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qList.Convert(&s)
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fmt.Println(s)
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d = makeAltered(s)
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} else if qMap, ok := v.(*qml.Map); ok {
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var m map[string]interface{}
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qMap.Convert(&m)
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fmt.Println(m)
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d = makeAltered(m)
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} else {
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panic(fmt.Sprintf("makeAltered err (unknown conversion): %T\n", v))
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}
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return
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}
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