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serve.go
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package main
import (
"bytes"
"context"
"embed"
"encoding/json"
"fmt"
"log/slog"
"net"
"net/http"
"time"
"github.com/gorilla/websocket"
"github.com/rramiachraf/observe/monitor"
"github.com/rramiachraf/observe/templates"
)
//go:embed static
var static embed.FS
func startServer(listener net.Listener, lg *slog.Logger) error {
mux := http.NewServeMux()
mt := monitor.NewMonitor()
go func() {
for {
err := mt.Update()
if err != nil {
msg := fmt.Sprintf("unable to update data, %s", err)
lg.Error(msg)
}
time.Sleep(3 * time.Second)
}
}()
mux.Handle("GET /", mainPageHandler{mt, lg})
mux.Handle("GET /ws", wsHandler{mt, lg})
mux.Handle("GET /api", apiHandler{mt, lg})
mux.Handle("GET /static/", http.FileServerFS(static))
server := &http.Server{
ReadTimeout: time.Second * 20,
WriteTimeout: time.Second * 20,
Handler: mux,
}
return server.Serve(listener)
}
type mainPageHandler struct {
monitor *monitor.Monitor
l *slog.Logger
}
func (h mainPageHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
err := templates.MainPage(h.monitor).Render(context.Background(), w)
if err != nil {
h.l.Error(err.Error())
w.WriteHeader(500)
}
}
var upgrade = websocket.Upgrader{
ReadBufferSize: 1024,
WriteBufferSize: 1024,
}
type wsHandler struct {
monitor *monitor.Monitor
l *slog.Logger
}
func (h wsHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
conn, err := upgrade.Upgrade(w, r, nil)
if err != nil {
h.l.Error(err.Error())
return
}
defer conn.Close()
for {
buf := bytes.NewBuffer(nil)
if err := templates.Monitor(h.monitor).Render(context.Background(), buf); err != nil {
h.l.Error(err.Error())
break
}
if err := conn.WriteMessage(1, buf.Bytes()); err != nil {
h.l.Error(err.Error())
break
}
time.Sleep(3 * time.Second)
}
}
type apiHandler struct {
monitor *monitor.Monitor
l *slog.Logger
}
func (h apiHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
enc := json.NewEncoder(w)
w.Header().Set("content-type", "application/json")
if err := enc.Encode(h.monitor); err != nil {
w.WriteHeader(http.StatusInternalServerError)
h.l.Error(err.Error())
}
}