- Rework redis with ws plugins

Signed-off-by: Valery Piashchynski <[email protected]>

2 files changed, 120 insertions, 0 deletions

diff --git a/plugins/memory/plugin.go b/plugins/memory/plugin.go
new file mode 100644
index 00000000..650f0b4b
--- /dev/null
+++ b/plugins/memory/plugin.go
@@ -0,0 +1,25 @@
+package memory
+
+import (
+	"github.com/spiral/roadrunner/v2/pkg/pubsub"
+	"github.com/spiral/roadrunner/v2/plugins/logger"
+)
+
+const PluginName string = "memory"
+
+type Plugin struct {
+	log logger.Logger
+}
+
+func (p *Plugin) Init(log logger.Logger) error {
+	p.log = log
+	return nil
+}
+
+func (p *Plugin) PSProvide(key string) (pubsub.PubSub, error) {
+	return NewPubSubDriver(p.log, key)
+}
+
+func (p *Plugin) Name() string {
+	return PluginName
+}
diff --git a/plugins/memory/pubsub.go b/plugins/memory/pubsub.go
new file mode 100644
index 00000000..75cd9d24
--- /dev/null
+++ b/plugins/memory/pubsub.go
@@ -0,0 +1,95 @@
+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
+}