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|
package events
import (
"fmt"
"strings"
"sync"
"github.com/spiral/errors"
)
type sub struct {
pattern string
w *wildcard
events chan<- Event
}
type eventsBus struct {
sync.RWMutex
subscribers sync.Map
internalEvCh chan Event
stop chan struct{}
}
func newEventsBus() *eventsBus {
return &eventsBus{
internalEvCh: make(chan Event, 100),
stop: make(chan struct{}),
}
}
/*
http.* <-
*/
// SubscribeAll for all RR events
// returns subscriptionID
func (eb *eventsBus) SubscribeAll(subID string, ch chan<- Event) error {
if ch == nil {
return errors.Str("nil channel provided")
}
subIDTr := strings.Trim(subID, " ")
if subIDTr == "" {
return errors.Str("subscriberID can't be empty")
}
return eb.subscribe(subID, "*", ch)
}
// SubscribeP pattern like "pluginName.EventType"
func (eb *eventsBus) SubscribeP(subID string, pattern string, ch chan<- Event) error {
if ch == nil {
return errors.Str("nil channel provided")
}
subIDTr := strings.Trim(subID, " ")
patternTr := strings.Trim(pattern, " ")
if subIDTr == "" || patternTr == "" {
return errors.Str("subscriberID or pattern can't be empty")
}
return eb.subscribe(subID, pattern, ch)
}
func (eb *eventsBus) Unsubscribe(subID string) {
eb.subscribers.Delete(subID)
}
func (eb *eventsBus) UnsubscribeP(subID, pattern string) {
if sb, ok := eb.subscribers.Load(subID); ok {
eb.Lock()
defer eb.Unlock()
sbArr := sb.([]*sub)
for i := 0; i < len(sbArr); i++ {
if sbArr[i].pattern == pattern {
sbArr[i] = sbArr[len(sbArr)-1]
sbArr = sbArr[:len(sbArr)-1]
// replace with new array
eb.subscribers.Store(subID, sbArr)
return
}
}
}
}
// Send sends event to the events bus
func (eb *eventsBus) Send(ev Event) {
// do not accept nil events
if ev == nil {
return
}
eb.internalEvCh <- ev
}
func (eb *eventsBus) Len() uint {
var ln uint
eb.subscribers.Range(func(key, value interface{}) bool {
ln++
return true
})
return ln
}
func (eb *eventsBus) subscribe(subID string, pattern string, ch chan<- Event) error {
eb.Lock()
defer eb.Unlock()
w, err := newWildcard(pattern)
if err != nil {
return err
}
if sb, ok := eb.subscribers.Load(subID); ok {
// at this point we are confident that sb is a []*sub type
subArr := sb.([]*sub)
subArr = append(subArr, &sub{
pattern: pattern,
w: w,
events: ch,
})
eb.subscribers.Store(subID, subArr)
return nil
}
subArr := make([]*sub, 0, 5)
subArr = append(subArr, &sub{
pattern: pattern,
w: w,
events: ch,
})
eb.subscribers.Store(subID, subArr)
return nil
}
func (eb *eventsBus) handleEvents() {
for { //nolint:gosimple
select {
case ev := <-eb.internalEvCh:
// http.WorkerError for example
wc := fmt.Sprintf("%s.%s", ev.Plugin(), ev.Type().String())
eb.subscribers.Range(func(key, value interface{}) bool {
vsub := value.([]*sub)
for i := 0; i < len(vsub); i++ {
if vsub[i].w.match(wc) {
select {
case vsub[i].events <- ev:
return true
default:
return true
}
}
}
return true
})
}
}
}
|
