mirror of https://github.com/poanetwork/quorum.git
154 lines
3.1 KiB
Go
154 lines
3.1 KiB
Go
package core
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import (
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"bytes"
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"math"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/state"
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)
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type AccountChange struct {
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Address, StateAddress []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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address []byte
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max int
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topics [][]byte
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BlockCallback func(*types.Block)
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LogsCallback func(state.Logs)
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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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// 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) SetAddress(addr []byte) {
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self.address = addr
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}
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func (self *Filter) SetTopics(topics [][]byte) {
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self.topics = topics
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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 logs with the current parameters set
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func (self *Filter) Find() state.Logs {
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earliestBlock := self.eth.ChainManager().CurrentBlock()
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var earliestBlockNo uint64 = uint64(self.earliest)
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if self.earliest == -1 {
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earliestBlockNo = earliestBlock.NumberU64()
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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 = earliestBlock.NumberU64()
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}
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var (
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logs state.Logs
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block = self.eth.ChainManager().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.NumberU64() == earliestBlockNo, block.NumberU64() == 0:
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quit = true
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case self.max <= len(logs):
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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 logs of the block
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logs, err := self.eth.BlockProcessor().GetLogs(block)
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if err != nil {
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chainlogger.Warnln("err: filter get logs ", err)
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break
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}
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logs = append(logs, self.FilterLogs(logs)...)
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}
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block = self.eth.ChainManager().GetBlock(block.ParentHash())
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}
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skip := int(math.Min(float64(len(logs)), float64(self.skip)))
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return logs[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) FilterLogs(logs state.Logs) state.Logs {
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var ret state.Logs
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// Filter the logs for interesting stuff
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for _, log := range logs {
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if len(self.address) > 0 && !bytes.Equal(self.address, log.Address()) {
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continue
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}
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for _, topic := range self.topics {
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if !includes(log.Topics(), topic) {
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continue
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}
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}
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ret = append(ret, log)
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}
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return ret
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}
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func (self *Filter) bloomFilter(block *types.Block) bool {
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if len(self.address) > 0 && !types.BloomLookup(block.Bloom(), self.address) {
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return false
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}
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for _, topic := range self.topics {
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if !types.BloomLookup(block.Bloom(), topic) {
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return false
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}
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}
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return true
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}
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