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package core
import (
"bytes"
"fmt"
"math"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/state"
)
type AccountChange struct {
Address, StateAddress []byte
}
type FilterOptions struct {
Earliest int64
Latest int64
Address []byte
Topics [][]byte
Skip int
Max int
}
// Filtering interface
type Filter struct {
eth EthManager
earliest int64
latest int64
skip int
address []byte
max int
topics [][]byte
BlockCallback func(*types.Block)
LogsCallback func(state.Logs)
}
// 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) SetOptions(options FilterOptions) {
self.earliest = options.Earliest
self.latest = options.Latest
self.skip = options.Skip
self.max = options.Max
self.address = options.Address
self.topics = options.Topics
}
// 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) SetAddress(addr []byte) {
self.address = addr
}
func (self *Filter) SetTopics(topics [][]byte) {
self.topics = topics
}
func (self *Filter) SetMax(max int) {
self.max = max
}
func (self *Filter) SetSkip(skip int) {
self.skip = skip
}
// Run filters logs with the current parameters set
func (self *Filter) Find() state.Logs {
earliestBlock := self.eth.ChainManager().CurrentBlock()
var earliestBlockNo uint64 = uint64(self.earliest)
if self.earliest == -1 {
earliestBlockNo = earliestBlock.NumberU64()
}
var latestBlockNo uint64 = uint64(self.latest)
if self.latest == -1 {
latestBlockNo = earliestBlock.NumberU64()
}
var (
logs state.Logs
block = self.eth.ChainManager().GetBlockByNumber(latestBlockNo)
quit bool
)
for i := 0; !quit && block != nil; i++ {
// Quit on latest
switch {
case block.NumberU64() == earliestBlockNo, block.NumberU64() == 0:
quit = true
case self.max <= len(logs):
break
}
// Use bloom filtering to see if this block is interesting given the
// current parameters
if self.bloomFilter(block) {
// Get the logs of the block
logs, err := self.eth.BlockProcessor().GetLogs(block)
if err != nil {
chainlogger.Warnln("err: filter get logs ", err)
break
}
logs = append(logs, self.FilterLogs(logs)...)
}
block = self.eth.ChainManager().GetBlock(block.ParentHash())
}
skip := int(math.Min(float64(len(logs)), float64(self.skip)))
return logs[skip:]
}
func includes(addresses [][]byte, a []byte) (found bool) {
for _, addr := range addresses {
fmt.Println("INCLUDES", addr, a)
if bytes.Compare(addr, a) == 0 {
return true
}
}
return
}
func (self *Filter) FilterLogs(logs state.Logs) state.Logs {
fmt.Println("FILTER LOGS", self.topics)
var ret state.Logs
// Filter the logs for interesting stuff
for _, log := range logs {
fmt.Println(log)
if len(self.address) > 0 && !bytes.Equal(self.address, log.Address()) {
continue
}
for _, topic := range self.topics {
fmt.Println("TOPIC:", topic)
if !includes(log.Topics(), topic) {
continue
}
}
fmt.Println("APPENDED")
ret = append(ret, log)
}
return ret
}
func (self *Filter) bloomFilter(block *types.Block) bool {
if len(self.address) > 0 && !types.BloomLookup(block.Bloom(), self.address) {
return false
}
for _, topic := range self.topics {
if !types.BloomLookup(block.Bloom(), topic) {
return false
}
}
return true
}
|
