event/filter: delete unused package (#18063)

event/filter/filter.go

-// 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 implements event filters.
-package filter
-
-import "reflect"
-
-type Filter interface {
-	Compare(Filter) bool
-	Trigger(data interface{})
-}
-
-type FilterEvent struct {
-	filter Filter
-	data   interface{}
-}
-
-type Filters struct {
-	id       int
-	watchers map[int]Filter
-	ch       chan FilterEvent
-
-	quit chan struct{}
-}
-
-func New() *Filters {
-	return &Filters{
-		ch:       make(chan FilterEvent),
-		watchers: make(map[int]Filter),
-		quit:     make(chan struct{}),
-	}
-}
-
-func (f *Filters) Start() {
-	go f.loop()
-}
-
-func (f *Filters) Stop() {
-	close(f.quit)
-}
-
-func (f *Filters) Notify(filter Filter, data interface{}) {
-	f.ch <- FilterEvent{filter, data}
-}
-
-func (f *Filters) Install(watcher Filter) int {
-	f.watchers[f.id] = watcher
-	f.id++
-
-	return f.id - 1
-}
-
-func (f *Filters) Uninstall(id int) {
-	delete(f.watchers, id)
-}
-
-func (f *Filters) loop() {
-out:
-	for {
-		select {
-		case <-f.quit:
-			break out
-		case event := <-f.ch:
-			for _, watcher := range f.watchers {
-				if reflect.TypeOf(watcher) == reflect.TypeOf(event.filter) {
-					if watcher.Compare(event.filter) {
-						watcher.Trigger(event.data)
-					}
-				}
-			}
-		}
-	}
-}
-
-func (f *Filters) Match(a, b Filter) bool {
-	return reflect.TypeOf(a) == reflect.TypeOf(b) && a.Compare(b)
-}
-
-func (f *Filters) Get(i int) Filter {
-	return f.watchers[i]
-}

event/filter/filter_test.go

-// 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
-
-import (
-	"testing"
-	"time"
-)
-
-// Simple test to check if baseline matching/mismatching filtering works.
-func TestFilters(t *testing.T) {
-	fm := New()
-	fm.Start()
-
-	// Register two filters to catch posted data
-	first := make(chan struct{})
-	fm.Install(Generic{
-		Str1: "hello",
-		Fn: func(data interface{}) {
-			first <- struct{}{}
-		},
-	})
-	second := make(chan struct{})
-	fm.Install(Generic{
-		Str1: "hello1",
-		Str2: "hello",
-		Fn: func(data interface{}) {
-			second <- struct{}{}
-		},
-	})
-	// Post an event that should only match the first filter
-	fm.Notify(Generic{Str1: "hello"}, true)
-	fm.Stop()
-
-	// Ensure only the mathcing filters fire
-	select {
-	case <-first:
-	case <-time.After(100 * time.Millisecond):
-		t.Error("matching filter timed out")
-	}
-	select {
-	case <-second:
-		t.Error("mismatching filter fired")
-	case <-time.After(100 * time.Millisecond):
-	}
-}

event/filter/generic_filter.go

-// 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
-
-type Generic struct {
-	Str1, Str2, Str3 string
-	Data             map[string]struct{}
-
-	Fn func(data interface{})
-}
-
-// self = registered, f = incoming
-func (self Generic) Compare(f Filter) bool {
-	var strMatch = true
-
-	filter := f.(Generic)
-	if (len(self.Str1) > 0 && filter.Str1 != self.Str1) ||
-		(len(self.Str2) > 0 && filter.Str2 != self.Str2) ||
-		(len(self.Str3) > 0 && filter.Str3 != self.Str3) {
-		strMatch = false
-	}
-
-	for k := range self.Data {
-		if _, ok := filter.Data[k]; !ok {
-			return false
-		}
-	}
-
-	return strMatch
-}
-
-func (self Generic) Trigger(data interface{}) {
-	self.Fn(data)
-}