Logging in webUI, Archive view refactor (#127)

* test logging

* test impl for logging

* implemented "live logging", restyle templates dropdown

* moved extract audio to downloadDialog, fixed labels

* code refactoring

* buffering logs

server/logging/handler.go

@@ -0,0 +1,80 @@
+package logging
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"strings"
+
+	"github.com/go-chi/chi/v5"
+	"github.com/gorilla/websocket"
+	"github.com/marcopeocchi/yt-dlp-web-ui/server/config"
+	middlewares "github.com/marcopeocchi/yt-dlp-web-ui/server/middleware"
+)
+
+var upgrader = websocket.Upgrader{
+	CheckOrigin: func(r *http.Request) bool {
+		return true
+	},
+	ReadBufferSize:  1000,
+	WriteBufferSize: 1000,
+}
+
+func webSocket(w http.ResponseWriter, r *http.Request) {
+	c, err := upgrader.Upgrade(w, r, nil)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	for msg := range logsObservable.Observe() {
+		c.WriteJSON(msg.V)
+	}
+}
+
+func sse(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "text/event-stream")
+	w.Header().Set("Cache-Control", "no-cache")
+	w.Header().Set("Connection", "keep-alive")
+
+	flusher, ok := w.(http.Flusher)
+	if !ok {
+		http.Error(w, "SSE not supported", http.StatusInternalServerError)
+		return
+	}
+
+	for msg := range logsObservable.Observe() {
+		if msg.E != nil {
+			http.Error(w, msg.E.Error(), http.StatusInternalServerError)
+			return
+		}
+
+		var (
+			b  bytes.Buffer
+			sb strings.Builder
+		)
+
+		if err := json.NewEncoder(&b).Encode(msg.V); err != nil {
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+
+		sb.WriteString("event: log\n")
+		sb.WriteString("data: " + b.String() + "\n\n")
+
+		fmt.Fprint(w, sb.String())
+
+		flusher.Flush()
+	}
+}
+
+func ApplyRouter() func(chi.Router) {
+	return func(r chi.Router) {
+		if config.Instance().RequireAuth {
+			r.Use(middlewares.Authenticated)
+		}
+		r.Get("/ws", webSocket)
+		r.Get("/sse", sse)
+	}
+}

server/logging/observable_logger.go

@@ -0,0 +1,29 @@
+package logging
+
+import (
+	"time"
+
+	"github.com/reactivex/rxgo/v2"
+)
+
+var (
+	logsChan       = make(chan rxgo.Item, 100)
+	logsObservable = rxgo.
+			FromChannel(logsChan, rxgo.WithBackPressureStrategy(rxgo.Drop)).
+			BufferWithTime(rxgo.WithDuration(time.Millisecond * 500))
+)
+
+type ObservableLogger struct{}
+
+func NewObservableLogger() *ObservableLogger {
+	return &ObservableLogger{}
+}
+
+func (o *ObservableLogger) Write(p []byte) (n int, err error) {
+	logsChan <- rxgo.Of(string(p))
+
+	n = len(p)
+	err = nil
+
+	return
+}