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package memory
import (
"sync"
"github.com/spiral/roadrunner/v2/pkg/bst"
websocketsv1 "github.com/spiral/roadrunner/v2/pkg/proto/websockets/v1beta"
"github.com/spiral/roadrunner/v2/pkg/pubsub"
"github.com/spiral/roadrunner/v2/plugins/logger"
"google.golang.org/protobuf/proto"
)
type PubSubDriver struct {
sync.RWMutex
// channel with the messages from the RPC
pushCh chan []byte
// user-subscribed topics
storage bst.Storage
log logger.Logger
}
func NewPubSubDriver(log logger.Logger, _ string) (pubsub.PubSub, error) {
ps := &PubSubDriver{
pushCh: make(chan []byte, 10),
storage: bst.NewBST(),
log: log,
}
return ps, nil
}
func (p *PubSubDriver) Publish(message []byte) error {
p.pushCh <- message
return nil
}
func (p *PubSubDriver) PublishAsync(message []byte) {
go func() {
p.pushCh <- message
}()
}
func (p *PubSubDriver) Subscribe(connectionID string, topics ...string) error {
p.Lock()
defer p.Unlock()
for i := 0; i < len(topics); i++ {
p.storage.Insert(connectionID, topics[i])
}
return nil
}
func (p *PubSubDriver) Unsubscribe(connectionID string, topics ...string) error {
p.Lock()
defer p.Unlock()
for i := 0; i < len(topics); i++ {
p.storage.Remove(connectionID, topics[i])
}
return nil
}
func (p *PubSubDriver) Connections(topic string, res map[string]struct{}) {
p.RLock()
defer p.RUnlock()
ret := p.storage.Get(topic)
for rr := range ret {
res[rr] = struct{}{}
}
}
func (p *PubSubDriver) Next() (*websocketsv1.Message, error) {
msg := <-p.pushCh
if msg == nil {
return nil, nil
}
p.RLock()
defer p.RUnlock()
m := &websocketsv1.Message{}
err := proto.Unmarshal(msg, m)
if err != nil {
return nil, err
}
// push only messages, which are subscribed
// TODO better???
for i := 0; i < len(m.GetTopics()); i++ {
// if we have active subscribers - send a message to a topic
// or send nil instead
if ok := p.storage.Contains(m.GetTopics()[i]); ok {
return m, nil
}
}
return nil, nil
}
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