147 lines
3.2 KiB
Go
147 lines
3.2 KiB
Go
package ethchain
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import (
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"bytes"
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"fmt"
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"github.com/ethereum/eth-go/ethstate"
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"github.com/ethereum/eth-go/ethutil"
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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 []byte
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latest []byte
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skip int
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from, to []byte
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max int
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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 interface{}) {
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e := ethutil.NewValue(earliest)
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// Check for -1 (latest) otherwise assume bytes
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if e.Int() == -1 {
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self.earliest = self.eth.BlockChain().CurrentBlock.Hash()
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} else if e.Len() > 0 {
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self.earliest = e.Bytes()
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} else {
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panic(fmt.Sprintf("earliest has to be either -1 or a valid hash: %v (%T)", e, e.Val))
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}
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}
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func (self *Filter) SetLatestBlock(latest interface{}) {
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l := ethutil.NewValue(latest)
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// Check for -1 (latest) otherwise assume bytes
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if l.Int() == -1 {
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self.latest = self.eth.BlockChain().CurrentBlock.Hash()
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} else if l.Len() > 0 {
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self.latest = l.Bytes()
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} else {
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panic(fmt.Sprintf("latest has to be either -1 or a valid hash: %v", l))
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}
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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) SetTo(addr []byte) {
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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 messages []*ethstate.Message
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block := self.eth.BlockChain().GetBlock(self.latest)
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// skip N blocks (useful for pagination)
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if self.skip > 0 {
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for i := 0; i < i; i++ {
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block = self.eth.BlockChain().GetBlock(block.PrevHash)
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}
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}
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// Start block filtering
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quit := false
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for i := 1; !quit && block != nil; i++ {
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// Mark last check
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if self.max == i || (len(self.earliest) > 0 && bytes.Compare(block.Hash(), self.earliest) == 0) {
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quit = true
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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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// Filter the messages for interesting stuff
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for _, message := range msgs {
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if len(self.to) > 0 && bytes.Compare(message.To, self.to) != 0 {
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continue
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}
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if len(self.from) > 0 && bytes.Compare(message.From, self.from) != 0 {
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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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}
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block = self.eth.BlockChain().GetBlock(block.PrevHash)
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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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if len(self.from) > 0 {
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if !bloom.Search(self.from) {
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return false
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}
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}
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if len(self.to) > 0 {
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if !bloom.Search(self.to) {
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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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