2015-07-06 17:54:22 -07:00
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// Copyright 2014 The go-ethereum Authors
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// This file is part of go-ethereum.
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//
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// go-ethereum is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// go-ethereum is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
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2014-12-04 01:28:02 -08:00
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package core
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2014-08-11 07:23:17 -07:00
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import (
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"math"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/core/state"
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"github.com/ethereum/go-ethereum/core/types"
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)
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2014-10-18 04:20:06 -07:00
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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 Backend
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earliest int64
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latest int64
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skip int
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address []common.Address
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max int
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topics [][]common.Hash
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BlockCallback func(*types.Block, state.Logs)
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TransactionCallback func(*types.Transaction)
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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 Backend) *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 []common.Address) {
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self.address = addr
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}
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func (self *Filter) SetTopics(topics [][]common.Hash) {
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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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)
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done:
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for i := 0; block != nil; i++ {
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// Quit on latest
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switch {
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case block.NumberU64() == 0:
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break done
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case block.NumberU64() < earliestBlockNo:
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break done
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case self.max <= len(logs):
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break done
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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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unfiltered, 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(unfiltered)...)
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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 []common.Address, a common.Address) bool {
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for _, addr := range addresses {
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if addr != a {
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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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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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Logs:
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for _, log := range logs {
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if len(self.address) > 0 && !includes(self.address, log.Address) {
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continue
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}
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logTopics := make([]common.Hash, len(self.topics))
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copy(logTopics, log.Topics)
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// If the to filtered topics is greater than the amount of topics in
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// logs, skip.
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if len(self.topics) > len(log.Topics) {
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continue Logs
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}
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for i, topics := range self.topics {
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var match bool
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for _, topic := range topics {
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// common.Hash{} is a match all (wildcard)
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if (topic == common.Hash{}) || log.Topics[i] == topic {
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match = true
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break
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}
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}
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if !match {
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continue Logs
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}
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2014-08-15 07:19:10 -07:00
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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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2014-11-18 07:58:22 -08:00
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func (self *Filter) bloomFilter(block *types.Block) bool {
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if len(self.address) > 0 {
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var included bool
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for _, addr := range self.address {
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if types.BloomLookup(block.Bloom(), addr) {
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included = true
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break
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}
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}
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if !included {
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return false
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}
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}
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2015-03-01 10:08:26 -08:00
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for _, sub := range self.topics {
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var included bool
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for _, topic := range sub {
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if (topic == common.Hash{}) || types.BloomLookup(block.Bloom(), topic) {
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included = true
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break
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}
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}
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if !included {
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return false
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}
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}
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2015-01-28 01:23:18 -08:00
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return true
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}
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