/
websocket.go
119 lines (105 loc) · 3.17 KB
/
websocket.go
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package server
import (
"context"
"errors"
"log"
"net/http"
"time"
"github.com/AlfredDobradi/ledgerlog/internal/database"
"github.com/AlfredDobradi/ledgerlog/internal/server/models"
"github.com/google/uuid"
"github.com/gorilla/websocket"
)
var upgrader = websocket.Upgrader{}
type PostUpdate struct {
Posts []models.PostDisplay
TotalNum int
}
func (h *Handler) handlePostsSocket(w http.ResponseWriter, r *http.Request) {
connID := uuid.New()
connTime := time.Now()
conn, err := upgrader.Upgrade(w, r, nil)
if err != nil {
log.Println(err)
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
defer conn.Close()
log.Printf("[%s] New connection established", connID.String())
firstUpdate, err := h.checkPosts(connID, 30, time.Unix(0, 0))
if err != nil {
log.Println(err)
conn.WriteMessage(websocket.CloseMessage, websocket.FormatCloseMessage(websocket.CloseInternalServerErr, err.Error())) // nolint
return
}
lastUpdate := time.Unix(0, 0)
if len(firstUpdate.Posts) > 0 {
lastUpdate = firstUpdate.Posts[0].Timestamp
}
if err := conn.WriteJSON(firstUpdate); err != nil {
log.Println(err)
conn.WriteMessage(websocket.CloseMessage, websocket.FormatCloseMessage(websocket.CloseInternalServerErr, err.Error())) // nolint
return
}
ticker := time.NewTicker(5 * time.Second)
stop := make(chan struct{})
conn.SetCloseHandler(func(code int, text string) error {
dur := time.Since(connTime)
stop <- struct{}{}
conn.WriteMessage(websocket.CloseMessage, websocket.FormatCloseMessage(websocket.CloseNormalClosure, "closed")) // nolint
log.Printf("[%s] Closed connection after %s", connID, dur)
return nil
})
go func() {
for {
select {
case <-ticker.C:
update, err := h.checkPosts(connID, 30, lastUpdate)
if err != nil {
log.Println(err)
conn.WriteMessage(websocket.CloseMessage, websocket.FormatCloseMessage(websocket.CloseInternalServerErr, err.Error())) // nolint
return
}
if len(update.Posts) > 0 {
if err := conn.WriteJSON(update); err != nil {
log.Println(err)
conn.WriteMessage(websocket.CloseMessage, websocket.FormatCloseMessage(websocket.CloseInternalServerErr, err.Error())) // nolint
return
}
lastUpdate = update.Posts[0].Timestamp
}
case <-stop:
ticker.Stop()
return
}
}
}()
for {
var msg map[string]interface{}
err := conn.ReadJSON(&msg)
if err != nil && !errors.Is(err, &websocket.CloseError{}) {
conn.WriteMessage(websocket.CloseMessage, websocket.FormatCloseMessage(websocket.CloseInternalServerErr, err.Error())) // nolint
return
}
}
}
func (h *Handler) checkPosts(connID uuid.UUID, maxnum int, since time.Time) (PostUpdate, error) {
// log.Printf("[%s] Checking for posts since %s...", connID.String(), since.Format(time.RFC3339))
conn, err := database.GetConnection(context.TODO())
defer func() {
if err := conn.Close(context.TODO()); err != nil {
log.Printf("Error closing connection: %v", err)
}
}()
if err != nil {
return PostUpdate{}, err
}
posts, allPosts, err := conn.GetPostsSince(maxnum, since)
if err != nil {
return PostUpdate{}, err
}
return PostUpdate{
Posts: posts,
TotalNum: allPosts,
}, err
}