1 files changed, 97 insertions, 0 deletions
diff --git a/plugins/redis/channel.go b/plugins/redis/channel.go
new file mode 100644
index 00000000..5817853c
--- /dev/null
+++ b/plugins/redis/channel.go
@@ -0,0 +1,97 @@
+package redis
+
+import (
+	"context"
+	"sync"
+
+	"github.com/go-redis/redis/v8"
+	"github.com/spiral/errors"
+	"github.com/spiral/roadrunner/v2/pkg/pubsub"
+	"github.com/spiral/roadrunner/v2/plugins/logger"
+	"github.com/spiral/roadrunner/v2/utils"
+)
+
+type redisChannel struct {
+	sync.Mutex
+
+	// redis client
+	client redis.UniversalClient
+	pubsub *redis.PubSub
+
+	log logger.Logger
+
+	// out channel with all subs
+	out chan *pubsub.Message
+
+	exit chan struct{}
+}
+
+func newRedisChannel(redisClient redis.UniversalClient, log logger.Logger) *redisChannel {
+	out := make(chan *pubsub.Message, 100)
+	fi := &redisChannel{
+		out:    out,
+		client: redisClient,
+		pubsub: redisClient.Subscribe(context.Background()),
+		exit:   make(chan struct{}),
+		log:    log,
+	}
+
+	// start reading messages
+	go fi.read()
+
+	return fi
+}
+
+func (r *redisChannel) sub(topics ...string) error {
+	const op = errors.Op("redis_sub")
+	err := r.pubsub.Subscribe(context.Background(), topics...)
+	if err != nil {
+		return errors.E(op, err)
+	}
+	return nil
+}
+
+// read reads messages from the pubsub subscription
+func (r *redisChannel) read() {
+	for {
+		select {
+		// here we receive message from us (which we sent before in Publish)
+		// it should be compatible with the pubsub.Message structure
+		// payload should be in the redis.message.payload field
+
+		case msg, ok := <-r.pubsub.Channel():
+			// channel closed
+			if !ok {
+				return
+			}
+
+			r.out <- &pubsub.Message{
+				Topic:   msg.Channel,
+				Payload: utils.AsBytes(msg.Payload),
+			}
+
+		case <-r.exit:
+			return
+		}
+	}
+}
+
+func (r *redisChannel) unsub(topic string) error {
+	const op = errors.Op("redis_unsub")
+	err := r.pubsub.Unsubscribe(context.Background(), topic)
+	if err != nil {
+		return errors.E(op, err)
+	}
+	return nil
+}
+
+func (r *redisChannel) stop() error {
+	r.exit <- struct{}{}
+	close(r.out)
+	close(r.exit)
+	return nil
+}
+
+func (r *redisChannel) message() *pubsub.Message {
+	return <-r.out
+}