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// 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()
}
}
}
}
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