mirror of https://github.com/poanetwork/quorum.git
95 lines
2.0 KiB
Go
95 lines
2.0 KiB
Go
// XXX This is the old filter system specifically for messages. This is till in used and could use some refactoring
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package filter
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import (
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"sync"
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"github.com/ethereum/go-ethereum/core"
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"github.com/ethereum/go-ethereum/event"
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"github.com/ethereum/go-ethereum/state"
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)
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type FilterManager struct {
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eventMux *event.TypeMux
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filterMu sync.RWMutex
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filterId int
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filters map[int]*core.Filter
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quit chan struct{}
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}
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func NewFilterManager(mux *event.TypeMux) *FilterManager {
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return &FilterManager{
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eventMux: mux,
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filters: make(map[int]*core.Filter),
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}
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}
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func (self *FilterManager) Start() {
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go self.filterLoop()
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}
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func (self *FilterManager) Stop() {
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close(self.quit)
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}
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func (self *FilterManager) InstallFilter(filter *core.Filter) (id int) {
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self.filterMu.Lock()
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id = self.filterId
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self.filters[id] = filter
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self.filterId++
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self.filterMu.Unlock()
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return id
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}
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func (self *FilterManager) UninstallFilter(id int) {
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self.filterMu.Lock()
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delete(self.filters, id)
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self.filterMu.Unlock()
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}
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// GetFilter retrieves a filter installed using InstallFilter.
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// The filter may not be modified.
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func (self *FilterManager) GetFilter(id int) *core.Filter {
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self.filterMu.RLock()
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defer self.filterMu.RUnlock()
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return self.filters[id]
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}
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func (self *FilterManager) filterLoop() {
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// Subscribe to events
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events := self.eventMux.Subscribe(core.NewBlockEvent{}, state.Messages(nil))
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out:
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for {
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select {
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case <-self.quit:
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break out
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case event := <-events.Chan():
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switch event := event.(type) {
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case core.NewBlockEvent:
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self.filterMu.RLock()
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for _, filter := range self.filters {
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if filter.BlockCallback != nil {
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filter.BlockCallback(event.Block)
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}
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}
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self.filterMu.RUnlock()
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case state.Messages:
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self.filterMu.RLock()
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for _, filter := range self.filters {
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if filter.MessageCallback != nil {
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msgs := filter.FilterMessages(event)
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if len(msgs) > 0 {
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filter.MessageCallback(msgs)
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}
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}
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}
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self.filterMu.RUnlock()
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}
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}
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}
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}
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