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core, event/filter, xeth: refactored filter system 

Moved the filtering system from `event` to `eth/filters` package and
removed the `core.Filter` object. The `filters.Filter` object now
requires a `common.Database` rather than a `eth.Backend` and invokes the
`core.GetBlockByX` directly rather than thru a "manager".
This commit is contained in:
Jeffrey Wilcke 2015-08-30 10:04:59 +02:00
parent 0d78f96205
commit f7a71996fb
4 changed files with 162 additions and 158 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
core/filter.go → eth/filters/filter.go
View File

@ -14,16 +14,15 @@
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package core
package filters
import (
"math"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/core/state"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/logger/glog"
)
type AccountChange struct {
@ -32,7 +31,7 @@ type AccountChange struct {
// Filtering interface
type Filter struct {
eth Backend
db common.Database
earliest int64
latest int64
skip int
@ -47,8 +46,8 @@ type Filter struct {
// 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 Backend) *Filter {
return &Filter{eth: eth}
func New(db common.Database) *Filter {
return &Filter{db: db}
}
// Set the earliest and latest block for filtering.
@ -80,7 +79,7 @@ func (self *Filter) SetSkip(skip int) {
// Run filters logs with the current parameters set
func (self *Filter) Find() state.Logs {
earliestBlock := self.eth.ChainManager().CurrentBlock()
earliestBlock := core.GetCurrentBlock(self.db)
var earliestBlockNo uint64 = uint64(self.earliest)
if self.earliest == -1 {
earliestBlockNo = earliestBlock.NumberU64()
@ -92,7 +91,7 @@ func (self *Filter) Find() state.Logs {
var (
logs state.Logs
block = self.eth.ChainManager().GetBlockByNumber(latestBlockNo)
block = core.GetBlockByNumber(self.db, latestBlockNo)
)
done:
@ -111,17 +110,17 @@ done:
// current parameters
if self.bloomFilter(block) {
// Get the logs of the block
unfiltered, err := self.eth.BlockProcessor().GetLogs(block)
if err != nil {
glog.V(logger.Warn).Infoln("err: filter get logs ", err)
break
var (
receipts = core.GetBlockReceipts(self.db, block.Hash())
unfiltered state.Logs
)
for _, receipt := range receipts {
unfiltered = append(unfiltered, receipt.Logs()...)
}
logs = append(logs, self.FilterLogs(unfiltered)...)
}
block = self.eth.ChainManager().GetBlock(block.ParentHash())
block = core.GetBlockByHash(self.db, block.ParentHash())
}
skip := int(math.Min(float64(len(logs)), float64(self.skip)))

133
eth/filters/filter_system.go Normal file
View File

@ -0,0 +1,133 @@
// Copyright 2014 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
// package filters implements an ethereum filtering system for block,
// transactions and log events.
package filters
import (
"sync"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/core/state"
"github.com/ethereum/go-ethereum/event"
)
// FilterSystem manages filters that filter specific events such as
// block, transaction and log events. The Filtering system can be used to listen
// for specific LOG events fires by the EVM (Ethereum Virtual Machine).
type FilterSystem struct {
eventMux *event.TypeMux
filterMu sync.RWMutex
filterId int
filters map[int]*Filter
quit chan struct{}
}
// NewFilterSystem returns a newly allocated filter manager
func NewFilterSystem(mux *event.TypeMux) *FilterSystem {
fs := &FilterSystem{
eventMux: mux,
filters: make(map[int]*Filter),
}
go fs.filterLoop()
return fs
}
// Stop quits the filter loop required for polling events
func (fs *FilterSystem) Stop() {
close(fs.quit)
}
// Add adds a filter to the filter manager
func (fs *FilterSystem) Add(filter *Filter) (id int) {
fs.filterMu.Lock()
defer fs.filterMu.Unlock()
id = fs.filterId
fs.filters[id] = filter
fs.filterId++
return id
}
// Remove removes a filter by filter id
func (fs *FilterSystem) Remove(id int) {
fs.filterMu.Lock()
defer fs.filterMu.Unlock()
if _, ok := fs.filters[id]; ok {
delete(fs.filters, id)
}
}
// Get retrieves a filter installed using Add The filter may not be modified.
func (fs *FilterSystem) Get(id int) *Filter {
fs.filterMu.RLock()
defer fs.filterMu.RUnlock()
return fs.filters[id]
}
// filterLoop waits for specific events from ethereum and fires their handlers
// when the filter matches the requirements.
func (fs *FilterSystem) filterLoop() {
// Subscribe to events
events := fs.eventMux.Subscribe(
//core.PendingBlockEvent{},
core.ChainEvent{},
core.TxPreEvent{},
state.Logs(nil))
out:
for {
select {
case <-fs.quit:
break out
case event := <-events.Chan():
switch event := event.(type) {
case core.ChainEvent:
fs.filterMu.RLock()
for _, filter := range fs.filters {
if filter.BlockCallback != nil {
filter.BlockCallback(event.Block, event.Logs)
}
}
fs.filterMu.RUnlock()
case core.TxPreEvent:
fs.filterMu.RLock()
for _, filter := range fs.filters {
if filter.TransactionCallback != nil {
filter.TransactionCallback(event.Tx)
}
}
fs.filterMu.RUnlock()
case state.Logs:
fs.filterMu.RLock()
for _, filter := range fs.filters {
if filter.LogsCallback != nil {
msgs := filter.FilterLogs(event)
if len(msgs) > 0 {
filter.LogsCallback(msgs)
}
}
}
fs.filterMu.RUnlock()
}
}
}
}

127
event/filter/eth_filter.go
View File

@ -1,127 +0,0 @@
// Copyright 2014 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package filter
// TODO make use of the generic filtering system
import (
"sync"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/core/state"
"github.com/ethereum/go-ethereum/event"
)
type FilterManager struct {
eventMux *event.TypeMux
filterMu sync.RWMutex
filterId int
filters map[int]*core.Filter
quit chan struct{}
}
func NewFilterManager(mux *event.TypeMux) *FilterManager {
return &FilterManager{
eventMux: mux,
filters: make(map[int]*core.Filter),
}
}
func (self *FilterManager) Start() {
go self.filterLoop()
}
func (self *FilterManager) Stop() {
close(self.quit)
}
func (self *FilterManager) InstallFilter(filter *core.Filter) (id int) {
self.filterMu.Lock()
defer self.filterMu.Unlock()
id = self.filterId
self.filters[id] = filter
self.filterId++
return id
}
func (self *FilterManager) UninstallFilter(id int) {
self.filterMu.Lock()
defer self.filterMu.Unlock()
if _, ok := self.filters[id]; ok {
delete(self.filters, id)
}
}
// GetFilter retrieves a filter installed using InstallFilter.
// The filter may not be modified.
func (self *FilterManager) GetFilter(id int) *core.Filter {
self.filterMu.RLock()
defer self.filterMu.RUnlock()
return self.filters[id]
}
func (self *FilterManager) filterLoop() {
// Subscribe to events
events := self.eventMux.Subscribe(
//core.PendingBlockEvent{},
core.ChainEvent{},
core.TxPreEvent{},
state.Logs(nil))
out:
for {
select {
case <-self.quit:
break out
case event := <-events.Chan():
switch event := event.(type) {
case core.ChainEvent:
self.filterMu.RLock()
for _, filter := range self.filters {
if filter.BlockCallback != nil {
filter.BlockCallback(event.Block, event.Logs)
}
}
self.filterMu.RUnlock()
case core.TxPreEvent:
self.filterMu.RLock()
for _, filter := range self.filters {
if filter.TransactionCallback != nil {
filter.TransactionCallback(event.Tx)
}
}
self.filterMu.RUnlock()
case state.Logs:
self.filterMu.RLock()
for _, filter := range self.filters {
if filter.LogsCallback != nil {
msgs := filter.FilterLogs(event)
if len(msgs) > 0 {
filter.LogsCallback(msgs)
}
}
}
self.filterMu.RUnlock()
}
}
}
}

31
xeth/xeth.go
View File

@ -35,7 +35,7 @@ import (
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/eth"
"github.com/ethereum/go-ethereum/event/filter"
"github.com/ethereum/go-ethereum/eth/filters"
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/logger/glog"
"github.com/ethereum/go-ethereum/miner"
@ -75,7 +75,7 @@ type XEth struct {
whisper *Whisper
quit chan struct{}
filterManager *filter.FilterManager
filterManager *filters.FilterSystem
logMu sync.RWMutex
logQueue map[int]*logQueue
@ -111,7 +111,7 @@ func New(ethereum *eth.Ethereum, frontend Frontend) *XEth {
backend: ethereum,
frontend: frontend,
quit: make(chan struct{}),
filterManager: filter.NewFilterManager(ethereum.EventMux()),
filterManager: filters.NewFilterSystem(ethereum.EventMux()),
logQueue: make(map[int]*logQueue),
blockQueue: make(map[int]*hashQueue),
transactionQueue: make(map[int]*hashQueue),
@ -128,7 +128,6 @@ func New(ethereum *eth.Ethereum, frontend Frontend) *XEth {
xeth.state = NewState(xeth, xeth.backend.ChainManager().State())
go xeth.start()
go xeth.filterManager.Start()
return xeth
}
@ -142,7 +141,7 @@ done:
self.logMu.Lock()
for id, filter := range self.logQueue {
if time.Since(filter.timeout) > filterTickerTime {
self.filterManager.UninstallFilter(id)
self.filterManager.Remove(id)
delete(self.logQueue, id)
}
}
@ -151,7 +150,7 @@ done:
self.blockMu.Lock()
for id, filter := range self.blockQueue {
if time.Since(filter.timeout) > filterTickerTime {
self.filterManager.UninstallFilter(id)
self.filterManager.Remove(id)
delete(self.blockQueue, id)
}
}
@ -160,7 +159,7 @@ done:
self.transactionMu.Lock()
for id, filter := range self.transactionQueue {
if time.Since(filter.timeout) > filterTickerTime {
self.filterManager.UninstallFilter(id)
self.filterManager.Remove(id)
delete(self.transactionQueue, id)
}
}
@ -504,7 +503,7 @@ func (self *XEth) IsContract(address string) bool {
}
func (self *XEth) UninstallFilter(id int) bool {
defer self.filterManager.UninstallFilter(id)
defer self.filterManager.Remove(id)
if _, ok := self.logQueue[id]; ok {
self.logMu.Lock()
@ -532,8 +531,8 @@ func (self *XEth) NewLogFilter(earliest, latest int64, skip, max int, address []
self.logMu.Lock()
defer self.logMu.Unlock()
filter := core.NewFilter(self.backend)
id := self.filterManager.InstallFilter(filter)
filter := filters.New(self.backend.ChainDb())
id := self.filterManager.Add(filter)
self.logQueue[id] = &logQueue{timeout: time.Now()}
filter.SetEarliestBlock(earliest)
@ -558,8 +557,8 @@ func (self *XEth) NewTransactionFilter() int {
self.transactionMu.Lock()
defer self.transactionMu.Unlock()
filter := core.NewFilter(self.backend)
id := self.filterManager.InstallFilter(filter)
filter := filters.New(self.backend.ChainDb())
id := self.filterManager.Add(filter)
self.transactionQueue[id] = &hashQueue{timeout: time.Now()}
filter.TransactionCallback = func(tx *types.Transaction) {
@ -577,8 +576,8 @@ func (self *XEth) NewBlockFilter() int {
self.blockMu.Lock()
defer self.blockMu.Unlock()
filter := core.NewFilter(self.backend)
id := self.filterManager.InstallFilter(filter)
filter := filters.New(self.backend.ChainDb())
id := self.filterManager.Add(filter)
self.blockQueue[id] = &hashQueue{timeout: time.Now()}
filter.BlockCallback = func(block *types.Block, logs state.Logs) {
@ -635,7 +634,7 @@ func (self *XEth) TransactionFilterChanged(id int) []common.Hash {
}
func (self *XEth) Logs(id int) state.Logs {
filter := self.filterManager.GetFilter(id)
filter := self.filterManager.Get(id)
if filter != nil {
return filter.Find()
}
@ -644,7 +643,7 @@ func (self *XEth) Logs(id int) state.Logs {
}
func (self *XEth) AllLogs(earliest, latest int64, skip, max int, address []string, topics [][]string) state.Logs {
filter := core.NewFilter(self.backend)
filter := filters.New(self.backend.ChainDb())
filter.SetEarliestBlock(earliest)
filter.SetLatestBlock(latest)
filter.SetSkip(skip)