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package memory
import (
"sync"
"github.com/spiral/roadrunner/v2/pkg/bst"
"github.com/spiral/roadrunner/v2/pkg/pubsub"
"github.com/spiral/roadrunner/v2/pkg/pubsub/message"
"github.com/spiral/roadrunner/v2/plugins/logger"
"google.golang.org/protobuf/proto"
)
type Plugin struct {
sync.RWMutex
log logger.Logger
// channel with the messages from the RPC
pushCh chan []byte
// user-subscribed topics
storage bst.Storage
}
func NewInMemory(log logger.Logger) pubsub.PubSub {
return &Plugin{
log: log,
pushCh: make(chan []byte, 10),
storage: bst.NewBST(),
}
}
func (p *Plugin) Publish(message []byte) error {
p.pushCh <- message
return nil
}
func (p *Plugin) PublishAsync(message []byte) {
go func() {
p.pushCh <- message
}()
}
func (p *Plugin) 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 *Plugin) 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 *Plugin) 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 *Plugin) Next() (*message.Message, error) {
msg := <-p.pushCh
if msg == nil {
return nil, nil
}
p.RLock()
defer p.RUnlock()
m := &message.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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