141 lines
3.5 KiB
Go
141 lines
3.5 KiB
Go
// Logwell : puits de logs syslog (UDP/TCP) stocké dans VictoriaLogs,
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// avec une interface web de consultation.
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package main
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import (
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"context"
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"crypto/subtle"
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"embed"
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"errors"
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"io/fs"
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"log"
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"net"
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"net/http"
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"os"
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"os/signal"
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"path/filepath"
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"strconv"
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"syscall"
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"time"
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_ "time/tzdata" // fuseaux horaires embarqués : la variable TZ fonctionne sans paquet système
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)
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//go:embed web
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var webFS embed.FS
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type config struct {
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syslogAddr string
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httpAddr string
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vlogsURL string
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dataDir string
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authUser string
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authPass string
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batchSize int
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queueSize int
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flushEvery time.Duration
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}
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func getenv(key, def string) string {
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if v := os.Getenv(key); v != "" {
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return v
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}
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return def
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}
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func getenvInt(key string, def int) int {
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if v, err := strconv.Atoi(os.Getenv(key)); err == nil && v > 0 {
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return v
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}
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return def
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}
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func main() {
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cfg := config{
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syslogAddr: getenv("SYSLOG_ADDR", ":5514"),
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httpAddr: getenv("HTTP_ADDR", ":8080"),
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vlogsURL: getenv("VLOGS_URL", "http://victorialogs:9428"),
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dataDir: getenv("DATA_DIR", "/data"),
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authUser: os.Getenv("AUTH_USER"),
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authPass: os.Getenv("AUTH_PASS"),
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batchSize: getenvInt("BATCH_SIZE", 1000),
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queueSize: getenvInt("QUEUE_SIZE", 100000),
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flushEvery: time.Duration(getenvInt("FLUSH_MS", 1000)) * time.Millisecond,
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}
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ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
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defer stop()
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tags, err := LoadTagStore(filepath.Join(cfg.dataDir, "tags.json"))
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if err != nil {
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log.Fatalf("tags : %v", err)
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}
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store := NewStore(cfg.vlogsURL, cfg.batchSize, cfg.queueSize, cfg.flushEvery)
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storeDone := make(chan struct{})
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go func() {
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store.Run(ctx)
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close(storeDone)
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}()
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hub := NewHub()
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sink := func(e *Entry) {
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store.Enqueue(e)
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hub.Publish(e)
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}
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if err := StartSyslog(ctx, cfg.syslogAddr, sink); err != nil {
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log.Fatalf("syslog : %v", err)
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}
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static, err := fs.Sub(webFS, "web")
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if err != nil {
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log.Fatal(err)
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}
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mux := http.NewServeMux()
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api := &API{store: store, hub: hub, tags: tags}
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api.Routes(mux)
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mux.Handle("GET /", http.FileServer(http.FS(static)))
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srv := &http.Server{
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Addr: cfg.httpAddr,
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Handler: basicAuth(cfg.authUser, cfg.authPass, mux),
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ReadHeaderTimeout: 10 * time.Second,
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// Les requêtes héritent du contexte global : les flux SSE se ferment à l'arrêt.
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BaseContext: func(net.Listener) context.Context { return ctx },
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}
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go func() {
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<-ctx.Done()
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shutdownCtx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
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defer cancel()
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_ = srv.Shutdown(shutdownCtx)
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}()
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log.Printf("interface web sur %s, syslog sur %s (udp+tcp), stockage %s", cfg.httpAddr, cfg.syslogAddr, cfg.vlogsURL)
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if err := srv.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
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log.Fatalf("http : %v", err)
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}
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<-storeDone
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log.Println("arrêt terminé")
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}
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// basicAuth protège l'interface si AUTH_USER est défini (sauf /healthz).
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func basicAuth(user, pass string, next http.Handler) http.Handler {
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if user == "" {
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return next
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}
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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if r.URL.Path == "/healthz" {
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next.ServeHTTP(w, r)
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return
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}
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u, p, ok := r.BasicAuth()
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if !ok ||
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subtle.ConstantTimeCompare([]byte(u), []byte(user)) != 1 ||
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subtle.ConstantTimeCompare([]byte(p), []byte(pass)) != 1 {
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w.Header().Set("WWW-Authenticate", `Basic realm="logwell"`)
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http.Error(w, "authentification requise", http.StatusUnauthorized)
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return
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}
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next.ServeHTTP(w, r)
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})
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}
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