SQLite cache

server/topic.go

@@ -1,7 +1,6 @@
 package server
 
 import (
-	"context"
 	"log"
 	"math/rand"
 	"sync"
@@ -12,11 +11,8 @@ import (
 // can publish a message
 type topic struct {
 	id          string
-	subscribers map[int]subscriber
-	messages    []*message
 	last        time.Time
-	ctx         context.Context
-	cancel      context.CancelFunc
+	subscribers map[int]subscriber
 	mu          sync.Mutex
 }
 
@@ -24,15 +20,11 @@ type topic struct {
 type subscriber func(msg *message) error
 
 // newTopic creates a new topic
-func newTopic(id string) *topic {
-	ctx, cancel := context.WithCancel(context.Background())
+func newTopic(id string, last time.Time) *topic {
 	return &topic{
 		id:          id,
+		last:        last,
 		subscribers: make(map[int]subscriber),
-		messages: make([]*message, 0),
-		last:        time.Now(),
-		ctx:         ctx,
-		cancel:      cancel,
 	}
 }
 
@@ -55,7 +47,6 @@ func (t *topic) Publish(m *message) error {
 	t.mu.Lock()
 	defer t.mu.Unlock()
 	t.last = time.Now()
-	t.messages = append(t.messages, m)
 	for _, s := range t.subscribers {
 		if err := s(m); err != nil {
 			log.Printf("error publishing message to subscriber")
@@ -64,38 +55,8 @@ func (t *topic) Publish(m *message) error {
 	return nil
 }
 
-func (t *topic) Messages(since time.Time) []*message {
+func (t *topic) Subscribers() int {
 	t.mu.Lock()
 	defer t.mu.Unlock()
-	messages := make([]*message, 0) // copy!
-	for _, m := range t.messages {
-		msgTime := time.Unix(m.Time, 0)
-		if msgTime == since || msgTime.After(since) {
-			messages = append(messages, m)
-		}
-	}
-	return messages
-}
-
-func (t *topic) Prune(keep time.Duration) {
-	t.mu.Lock()
-	defer t.mu.Unlock()
-	for i, m := range t.messages {
-		msgTime := time.Unix(m.Time, 0)
-		if time.Since(msgTime) < keep {
-			t.messages = t.messages[i:]
-			return
-		}
-	}
-	t.messages = make([]*message, 0)
-}
-
-func (t *topic) Stats() (subscribers int, messages int) {
-	t.mu.Lock()
-	defer t.mu.Unlock()
-	return len(t.subscribers), len(t.messages)
-}
-
-func (t *topic) Close() {
-	t.cancel()
+	return len(t.subscribers)
 }