#723 fix(redis, ws): redis driver not available

#723 fix(redis, ws): redis driver not available

1 files changed, 189 insertions, 0 deletions

diff --git a/plugins/redis/pubsub.go b/plugins/redis/pubsub.go
new file mode 100644
index 00000000..dbda7ea4
--- /dev/null
+++ b/plugins/redis/pubsub.go
@@ -0,0 +1,189 @@
+package redis
+
+import (
+	"context"
+	"sync"
+
+	"github.com/go-redis/redis/v8"
+	"github.com/spiral/errors"
+	websocketsv1 "github.com/spiral/roadrunner/v2/pkg/proto/websockets/v1beta"
+	"github.com/spiral/roadrunner/v2/pkg/pubsub"
+	"github.com/spiral/roadrunner/v2/plugins/config"
+	"github.com/spiral/roadrunner/v2/plugins/logger"
+	"google.golang.org/protobuf/proto"
+)
+
+type PubSubDriver struct {
+	sync.RWMutex
+	cfg *Config `mapstructure:"redis"`
+
+	log             logger.Logger
+	fanin           *FanIn
+	universalClient redis.UniversalClient
+	stopCh          chan struct{}
+}
+
+func NewPubSubDriver(log logger.Logger, key string, cfgPlugin config.Configurer, stopCh chan struct{}) (pubsub.PubSub, error) {
+	const op = errors.Op("new_pub_sub_driver")
+	ps := &PubSubDriver{
+		log:    log,
+		stopCh: stopCh,
+	}
+
+	// will be different for every connected driver
+	err := cfgPlugin.UnmarshalKey(key, &ps.cfg)
+	if err != nil {
+		return nil, errors.E(op, err)
+	}
+
+	ps.cfg.InitDefaults()
+
+	ps.universalClient = redis.NewUniversalClient(&redis.UniversalOptions{
+		Addrs:              ps.cfg.Addrs,
+		DB:                 ps.cfg.DB,
+		Username:           ps.cfg.Username,
+		Password:           ps.cfg.Password,
+		SentinelPassword:   ps.cfg.SentinelPassword,
+		MaxRetries:         ps.cfg.MaxRetries,
+		MinRetryBackoff:    ps.cfg.MaxRetryBackoff,
+		MaxRetryBackoff:    ps.cfg.MaxRetryBackoff,
+		DialTimeout:        ps.cfg.DialTimeout,
+		ReadTimeout:        ps.cfg.ReadTimeout,
+		WriteTimeout:       ps.cfg.WriteTimeout,
+		PoolSize:           ps.cfg.PoolSize,
+		MinIdleConns:       ps.cfg.MinIdleConns,
+		MaxConnAge:         ps.cfg.MaxConnAge,
+		PoolTimeout:        ps.cfg.PoolTimeout,
+		IdleTimeout:        ps.cfg.IdleTimeout,
+		IdleCheckFrequency: ps.cfg.IdleCheckFreq,
+		ReadOnly:           ps.cfg.ReadOnly,
+		RouteByLatency:     ps.cfg.RouteByLatency,
+		RouteRandomly:      ps.cfg.RouteRandomly,
+		MasterName:         ps.cfg.MasterName,
+	})
+
+	ps.fanin = newFanIn(ps.universalClient, log)
+
+	ps.stop()
+
+	return ps, nil
+}
+
+func (p *PubSubDriver) stop() {
+	go func() {
+		for range p.stopCh {
+			_ = p.fanin.stop()
+			return
+		}
+	}()
+}
+
+func (p *PubSubDriver) Publish(msg []byte) error {
+	p.Lock()
+	defer p.Unlock()
+
+	m := &websocketsv1.Message{}
+	err := proto.Unmarshal(msg, m)
+	if err != nil {
+		return errors.E(err)
+	}
+
+	for j := 0; j < len(m.GetTopics()); j++ {
+		f := p.universalClient.Publish(context.Background(), m.GetTopics()[j], msg)
+		if f.Err() != nil {
+			return f.Err()
+		}
+	}
+	return nil
+}
+
+func (p *PubSubDriver) PublishAsync(msg []byte) {
+	go func() {
+		p.Lock()
+		defer p.Unlock()
+		m := &websocketsv1.Message{}
+		err := proto.Unmarshal(msg, m)
+		if err != nil {
+			p.log.Error("message unmarshal error")
+			return
+		}
+
+		for j := 0; j < len(m.GetTopics()); j++ {
+			f := p.universalClient.Publish(context.Background(), m.GetTopics()[j], msg)
+			if f.Err() != nil {
+				p.log.Error("redis publish", "error", f.Err())
+			}
+		}
+	}()
+}
+
+func (p *PubSubDriver) Subscribe(connectionID string, topics ...string) error {
+	// just add a connection
+	for i := 0; i < len(topics); i++ {
+		// key - topic
+		// value - connectionID
+		hset := p.universalClient.SAdd(context.Background(), topics[i], connectionID)
+		res, err := hset.Result()
+		if err != nil {
+			return err
+		}
+		if res == 0 {
+			p.log.Warn("could not subscribe to the provided topic", "connectionID", connectionID, "topic", topics[i])
+			continue
+		}
+	}
+
+	// and subscribe after
+	return p.fanin.sub(topics...)
+}
+
+func (p *PubSubDriver) Unsubscribe(connectionID string, topics ...string) error {
+	// Remove topics from the storage
+	for i := 0; i < len(topics); i++ {
+		srem := p.universalClient.SRem(context.Background(), topics[i], connectionID)
+		if srem.Err() != nil {
+			return srem.Err()
+		}
+	}
+
+	for i := 0; i < len(topics); i++ {
+		// if there are no such topics, we can safely unsubscribe from the redis
+		exists := p.universalClient.Exists(context.Background(), topics[i])
+		res, err := exists.Result()
+		if err != nil {
+			return err
+		}
+
+		// if we have associated connections - skip
+		if res == 1 { // exists means that topic still exists and some other nodes may have connections associated with it
+			continue
+		}
+
+		// else - unsubscribe
+		err = p.fanin.unsub(topics[i])
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (p *PubSubDriver) Connections(topic string, res map[string]struct{}) {
+	hget := p.universalClient.SMembersMap(context.Background(), topic)
+	r, err := hget.Result()
+	if err != nil {
+		panic(err)
+	}
+
+	// assighn connections
+	// res expected to be from the sync.Pool
+	for k := range r {
+		res[k] = struct{}{}
+	}
+}
+
+// Next return next message
+func (p *PubSubDriver) Next() (*websocketsv1.Message, error) {
+	return <-p.fanin.consume(), nil
+}