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package memorypubsub
import (
"context"
"sync"
"github.com/spiral/errors"
"github.com/spiral/roadrunner/v2/common/pubsub"
"github.com/spiral/roadrunner/v2/pkg/bst"
"github.com/spiral/roadrunner/v2/plugins/logger"
)
type PubSubDriver struct {
sync.RWMutex
// channel with the messages from the RPC
pushCh chan *pubsub.Message
// user-subscribed topics
storage bst.Storage
log logger.Logger
}
func NewPubSubDriver(log logger.Logger, _ string) (*PubSubDriver, error) {
ps := &PubSubDriver{
pushCh: make(chan *pubsub.Message, 100),
storage: bst.NewBST(),
log: log,
}
return ps, nil
}
func (p *PubSubDriver) Publish(msg *pubsub.Message) error {
p.pushCh <- msg
return nil
}
func (p *PubSubDriver) PublishAsync(msg *pubsub.Message) {
go func() {
p.pushCh <- msg
}()
}
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(ctx context.Context) (*pubsub.Message, error) {
const op = errors.Op("pubsub_memory")
select {
case msg := <-p.pushCh:
if msg == nil {
return nil, nil
}
p.RLock()
defer p.RUnlock()
// push only messages, which topics are subscibed
// TODO better???
// if we have active subscribers - send a message to a topic
// or send nil instead
if ok := p.storage.Contains(msg.Topic); ok {
return msg, nil
}
case <-ctx.Done():
return nil, errors.E(op, errors.TimeOut, ctx.Err())
}
return nil, nil
}
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