Make chat persistent across reboot

backend/main.go

@@ -38,6 +38,7 @@ func main() {
 	if err != nil {
 		log.Fatal(err)
 	}
+	services.InitWebSocket(db)
 
 	// SPOTIFY
 	spotifyAuthState := os.Getenv("SPOTIFY_AUTH_STATE")

backend/models/models.go

@@ -30,8 +30,7 @@ type Post struct {
 type Message struct {
 	ID        uint           `gorm:"primarykey" json:"id"`
 	Content   string         `json:"text"`
-	AuthorID  uint           `json:"-"`
-	Author    *User          `gorm:"foreignKey:AuthorID" json:"author"`
+	AuthorID  uint           `json:"authorId"`
 	CreatedAt time.Time      `json:"createdAt"`
 	DeletedAt gorm.DeletedAt `gorm:"index" json:"deletedAt"`
 }

backend/services/database.go

@@ -37,6 +37,7 @@ func migrateDatabase(db *gorm.DB) error {
 		&models.Activity{},
 		&models.Favorite{},
 		&models.Rowing{},
+		&models.Message{},
 	)
 	if err != nil {
 		return err

backend/services/websocket.go

@@ -3,49 +3,15 @@ package services
 import (
 	"net/http"
 	"sync"
-	"time"
 
 	"adam-french.co.uk/backend/models"
+	"gorm.io/gorm"
 
 	"github.com/gorilla/websocket"
 )
 
 const maxMessages = 50
 
-type MessageRing struct {
-	buf  []models.Message
-	next int  // index to write next
-	full bool // have we wrapped at least once
-}
-
-func NewMessageRing(size int) *MessageRing {
-	return &MessageRing{
-		buf: make([]models.Message, size),
-	}
-}
-
-func (r *MessageRing) Add(m models.Message) {
-	r.buf[r.next] = m
-	r.next = (r.next + 1) % len(r.buf)
-	if r.next == 0 {
-		r.full = true
-	}
-}
-
-// Messages returns messages in chronological order (oldest -> newest).
-func (r *MessageRing) Messages() []models.Message {
-	if !r.full {
-		// buffer not wrapped yet; only use [0:next)
-		return r.buf[:r.next]
-	}
-
-	// wrapped: start at next, then to end, then from 0 to next
-	out := make([]models.Message, len(r.buf))
-	copy(out, r.buf[r.next:])
-	copy(out[len(r.buf)-r.next:], r.buf[:r.next])
-	return out
-}
-
 var Upgrader = websocket.Upgrader{
 	ReadBufferSize:  1024,
 	WriteBufferSize: 1024,
@@ -56,26 +22,32 @@ var Upgrader = websocket.Upgrader{
 
 var (
 	clients      = make(map[*websocket.Conn]bool)
-	messages = NewMessageRing(maxMessages)
 	mu           sync.Mutex
+	wsDB         *gorm.DB
+	nextAuthorID uint
 )
 
+func InitWebSocket(database *gorm.DB) {
+	wsDB = database
+}
+
 func HandleWebSocket(conn *websocket.Conn) {
 	defer conn.Close()
 
 	mu.Lock()
 	clients[conn] = true
+	nextAuthorID++
+	authorID := nextAuthorID
 
-	history := messages.Messages()
+	var history []models.Message
+	wsDB.Order("created_at ASC").Limit(maxMessages).Find(&history)
 
-	// Send existing message history to new client
 	for _, msg := range history {
 		if err := conn.WriteJSON(msg); err != nil {
 			mu.Unlock()
 			return
 		}
 	}
-
 	mu.Unlock()
 
 	for {
@@ -84,11 +56,13 @@ func HandleWebSocket(conn *websocket.Conn) {
 			break
 		}
 
-		incoming.CreatedAt = time.Now()
+		incoming.AuthorID = authorID
 
-		// Store and broadcast
 		mu.Lock()
-		messages.Add(incoming)
+		wsDB.Create(&incoming)
+		wsDB.Where("id NOT IN (?)",
+			wsDB.Model(&models.Message{}).Select("id").Order("created_at DESC").Limit(maxMessages),
+		).Delete(&models.Message{})
 
 		for client := range clients {
 			if err := client.WriteJSON(incoming); err != nil {
@@ -99,7 +73,6 @@ func HandleWebSocket(conn *websocket.Conn) {
 		mu.Unlock()
 	}
 
-	// Cleanup on disconnect
 	mu.Lock()
 	delete(clients, conn)
 	mu.Unlock()