fix-2

cmd/unified/main.go

@@ -10,6 +10,7 @@ import (
 	"net/http"
 	"os"
 	"os/signal"
+	"path/filepath"
 	"strconv"
 	"strings"
 	"syscall"
@@ -55,6 +56,11 @@ func loadConfig() AppConfig {
 	m.PeerTTL = parseDuration(os.Getenv("MESH_PEER_TTL"), 2*time.Minute)
 	m.PruneInterval = parseDuration(os.Getenv("MESH_PRUNE_INTERVAL"), 30*time.Second)
 
+	m.HelloInterval = parseDuration(os.Getenv("MESH_HELLO_INTERVAL"), 20*time.Second)
+	m.HelloFanout = parseIntEnv(os.Getenv("MESH_HELLO_FANOUT"), 8)
+
+	m.BlobTimeout = parseDuration(os.Getenv("MESH_BLOB_TIMEOUT"), 0)
+
 	// Wenn keine AdvertURL gesetzt ist, versuche eine sinnvolle Herleitung:
 	if strings.TrimSpace(m.AdvertURL) == "" {
 		m.AdvertURL = inferAdvertURL(m.BindAddr)
@@ -101,6 +107,18 @@ func parseBoolEnv(k string, def bool) bool {
 	return v == "1" || v == "true" || v == "yes" || v == "on"
 }
 
+func parseIntEnv(k string, def int) int {
+	v := strings.TrimSpace(os.Getenv(k))
+	if v == "" {
+		return def
+	}
+	n, err := strconv.Atoi(v)
+	if err != nil {
+		return def
+	}
+	return n
+}
+
 func splitCSV(s string) []string {
 	s = strings.TrimSpace(s)
 	if s == "" {
@@ -465,11 +483,14 @@ func main() {
 
 	// Domain-Store (mesh-fähig)
 	nodeID := strings.TrimSpace(cfg.Mesh.AdvertURL)
-	st := filesvc.NewMemStore(nodeID)
+	//st := filesvc.NewMemStore(nodeID)
 
 	// Mesh starten
 	//mcfg := mesh.FromEnv()
 	blobs := blobfs.New(getenvDefault("DATA_DIR", "./data"))
+	dataDir := getenvDefault("DATA_DIR", "./data")
+	metaPath := filepath.Join(dataDir, "meta", "items.json")
+	st := filesvc.NewMemStorePersistent(nodeID, metaPath)
 
 	mnode, err := mesh.New(cfg.Mesh, mesh.Callbacks{
 		GetSnapshot: func(ctx context.Context) (mesh.Snapshot, error) {
@@ -620,36 +641,28 @@ func registerPublicDownloads(mux *http.ServeMux, store filesvc.MeshStore, blobs
 		base = "/" + base
 	}
 	mux.HandleFunc(base+"/", func(w http.ResponseWriter, r *http.Request) {
-		idStr := strings.TrimPrefix(r.URL.Path, base+"/")
+		id := strings.TrimSpace(strings.TrimPrefix(r.URL.Path, base+"/"))
-		if idStr == "" {
+		if id == "" {
-			http.NotFound(w, r)
-			return
-		}
-		id := idStr
-		if strings.TrimSpace(id) == "" {
 			http.NotFound(w, r)
 			return
 		}
 
-		// 1) Metadaten prüfen (nicht vorhanden oder gelöscht → 404)
+		// 1) Metadaten prüfen
 		it, err := store.Get(r.Context(), filesvc.ID(id))
 		if err != nil || it.Deleted {
 			http.NotFound(w, r)
 			return
 		}
 
-		// 2) lokal versuchen
+		// 2) Lokal versuchen
-		if rc, meta, err := blobs.Open(r.Context(), id); err == nil {
+		if rc, meta, err := blobs.Open(context.Background(), id); err == nil {
 			defer rc.Close()
-			serveBlob(w, r, rc, meta, it.Name) // Download-Name aus Store!
+			serveBlob(w, r, rc, meta, it.Name)
-			return
-		} else { // ########## HIER EVENTUELL PROBLEM!!! ###########
-			// Lokal nicht vorhanden → nur aus Mesh ziehen, wenn Owner aktiv ist
-			it, err := store.Get(r.Context(), filesvc.ID(id))
-			if err != nil || it.Deleted {
-				http.NotFound(w, r)
 			return
 		}
+
+		// (Optional) Owner-Online-Check — wenn du auch bei offline Ownern liefern willst, block auskommentieren
+		{
 			peers := meshNode.PeerList()
 			ttl := 2 * time.Minute
 			if !isOwnerActive(it.Owner, peers, ttl) {
@@ -658,26 +671,34 @@ func registerPublicDownloads(mux *http.ServeMux, store filesvc.MeshStore, blobs
 			}
 		}
 
-		// 3) aus Mesh holen (signiert) und cachen
+		// 3) Aus Mesh holen — EIGENER Timeout-Kontext, NICHT r.Context()
-		rrc, _, _, _, err := meshNode.FetchBlobAny(r.Context(), id)
+		rrc, remoteName, _, _, err := meshNode.FetchBlobAny(context.Background(), id)
 		if err != nil {
 			http.NotFound(w, r)
 			return
 		}
 		defer rrc.Close()
-		if _, err := blobs.Save(r.Context(), id, it.Name, rrc); err != nil {
+
-			http.Error(w, "cache failed", http.StatusInternalServerError)
+		filename := strings.TrimSpace(remoteName)
+		if filename == "" {
+			filename = it.Name
+		}
+
+		// 4) Lokal cachen — KEIN Request-Kontext, damit Save nicht abbricht
+		if _, err := blobs.Save(context.Background(), id, filename, rrc); err != nil {
+			log.Printf("[public] cache save failed id=%s name=%q: %v", id, filename, err)
+			http.Error(w, "cache failed: "+err.Error(), http.StatusInternalServerError)
 			return
 		}
 
-		// 4) erneut lokal öffnen und streamen
+		// 5) Erneut lokal öffnen und streamen
-		lrc, meta, err := blobs.Open(r.Context(), id)
+		lrc, meta, err := blobs.Open(context.Background(), id)
 		if err != nil {
-			http.Error(w, "open failed", http.StatusInternalServerError)
+			http.Error(w, "open failed: "+err.Error(), http.StatusInternalServerError)
 			return
 		}
 		defer lrc.Close()
-		serveBlob(w, r, lrc, meta, it.Name)
+		serveBlob(w, r, lrc, meta, filename)
 	})
 }
 

internal/filesvc/memstore.go

@@ -2,6 +2,9 @@ package filesvc
 
 import (
 	"context"
+	"encoding/json"
+	"os"
+	"path/filepath"
 	"slices"
 	"strings"
 	"sync"
@@ -14,12 +17,81 @@ type MemStore struct {
 	self  string
 	// optionales Eventing
 	subs        []chan ChangeEvent
+	persistPath string
 }
 
 func NewMemStore(self string) *MemStore {
 	return &MemStore{self: strings.TrimSpace(self), items: make(map[ID]File)}
 }
 
+func NewMemStorePersistent(self, path string) *MemStore {
+	m := NewMemStore(self)
+	m.persistPath = strings.TrimSpace(path)
+	// beim Start versuchen zu laden
+	_ = m.loadFromDisk()
+	return m
+}
+
+// --- Persistenz-Helper (NEU) ---
+
+func (m *MemStore) loadFromDisk() error {
+	if m.persistPath == "" {
+		return nil
+	}
+	f, err := os.Open(m.persistPath)
+	if err != nil {
+		return nil // Datei existiert beim ersten Start nicht – ok
+	}
+	defer f.Close()
+	var snap Snapshot
+	if err := json.NewDecoder(f).Decode(&snap); err != nil {
+		return err
+	}
+	m.mu.Lock()
+	for _, it := range snap.Items {
+		m.items[it.ID] = it
+	}
+	m.mu.Unlock()
+	return nil
+}
+
+func (m *MemStore) saveLocked() error {
+	if m.persistPath == "" {
+		return nil
+	}
+	if err := os.MkdirAll(filepath.Dir(m.persistPath), 0o755); err != nil {
+		return err
+	}
+	// Snapshot aus Map bauen
+	snap := Snapshot{Items: make([]File, 0, len(m.items))}
+	for _, it := range m.items {
+		snap.Items = append(snap.Items, it)
+	}
+	// atomar schreiben
+	tmp := m.persistPath + ".tmp"
+	f, err := os.Create(tmp)
+	if err != nil {
+		return err
+	}
+	enc := json.NewEncoder(f)
+	enc.SetIndent("", "  ")
+	if err := enc.Encode(&snap); err != nil {
+		f.Close()
+		_ = os.Remove(tmp)
+		return err
+	}
+	if err := f.Sync(); err != nil {
+		f.Close()
+		_ = os.Remove(tmp)
+		return err
+	}
+	if err := f.Close(); err != nil {
+		_ = os.Remove(tmp)
+		return err
+	}
+	return os.Rename(tmp, m.persistPath)
+}
+
 /*** Store ***/
 
 func (m *MemStore) Get(_ context.Context, id ID) (File, error) {
@@ -102,6 +174,7 @@ func (m *MemStore) Create(_ context.Context, name string) (File, error) {
 	}
 	it := File{ID: uid, Name: name, UpdatedAt: now, Owner: m.self}
 	m.items[it.ID] = it
+	_ = m.saveLocked()
 	m.emit(it)
 	return it, nil
 }
@@ -124,6 +197,7 @@ func (m *MemStore) Rename(_ context.Context, id ID, newName string) (File, error
 	it.Name = strings.TrimSpace(newName)
 	it.UpdatedAt = time.Now().UnixNano()
 	m.items[id] = it
+	_ = m.saveLocked()
 	m.emit(it)
 	return it, nil
 }
@@ -144,6 +218,7 @@ func (m *MemStore) Delete(_ context.Context, id ID) (File, error) {
 	it.Deleted = true
 	it.UpdatedAt = time.Now().UnixNano()
 	m.items[id] = it
+	_ = m.saveLocked()
 	m.emit(it)
 	return it, nil
 }
@@ -169,6 +244,7 @@ func (m *MemStore) TakeoverOwner(_ context.Context, id ID, newOwner string) (Fil
 	it.Owner = newOwner
 	it.UpdatedAt = time.Now().UnixNano()
 	m.items[id] = it
+	_ = m.saveLocked()
 	m.emitLocked(it)
 	return it, nil
 }
@@ -188,6 +264,7 @@ func (m *MemStore) Snapshot(_ context.Context) (Snapshot, error) {
 func (m *MemStore) ApplyRemote(_ context.Context, s Snapshot) error {
 	m.mu.Lock()
 	defer m.mu.Unlock()
+	changed := false
 	for _, ri := range s.Items {
 		li, ok := m.items[ri.ID]
 		if !ok || ri.UpdatedAt > li.UpdatedAt {
@@ -196,9 +273,13 @@ func (m *MemStore) ApplyRemote(_ context.Context, s Snapshot) error {
 				ri.Owner = li.Owner
 			}
 			m.items[ri.ID] = ri
+			changed = true
 			m.emitLocked(ri)
 		}
 	}
+	if changed {
+		_ = m.saveLocked() // ← NEU
+	}
 	return nil
 }
 

internal/mesh/mesh.go

@@ -12,6 +12,7 @@ import (
 	"hash/crc32"
 	"io"
 	"log"
+	"math/rand/v2"
 	"net"
 	"net/http"
 	"os"
@@ -33,6 +34,15 @@ type Config struct {
 	DiscoveryAddress string        // "239.8.8.8:9898"
 	PeerTTL          time.Duration // wie lange darf ein Peer inaktiv sein (Default siehe unten)
 	PruneInterval    time.Duration // wie oft wird gepruned
+
+	SyncInterval time.Duration
+	Fanout       int
+
+	// NEU:
+	HelloInterval time.Duration // wie oft pingen
+	HelloFanout   int           // wie viele Peers pro Tick
+
+	BlobTimeout time.Duration
 }
 
 type Peer struct {
@@ -190,21 +200,38 @@ func (n *Node) helloHandler(w http.ResponseWriter, r *http.Request) {
 		http.Error(w, "bad signature", http.StatusUnauthorized)
 		return
 	}
-	var p Peer
+	var req struct {
-	if err := json.Unmarshal(body, &p); err != nil {
+		URL string `json:"url"`
+	}
+	if err := json.Unmarshal(body, &req); err != nil || strings.TrimSpace(req.URL) == "" {
 		http.Error(w, "bad json", http.StatusBadRequest)
 		return
 	}
-	p.LastSeen = time.Now()
+
+	// Peer anlegen (falls neu) und LastSeen setzen
 	n.mu.Lock()
-	if existing, ok := n.peers[p.URL]; ok {
+	if req.URL != n.self.URL {
-		existing.LastSeen = p.LastSeen
+		if p, ok := n.peers[req.URL]; ok {
-	} else if p.URL != n.self.URL {
+			p.LastSeen = time.Now()
-		cp := p
+		} else {
-		n.peers[p.URL] = &cp
+			cp := Peer{URL: req.URL, LastSeen: time.Now()} // weitere Felder wie bekannt
+			n.peers[req.URL] = &cp
+		}
+	}
+	n.mu.Unlock()
+
+	w.WriteHeader(http.StatusOK)
+}
+
+func (n *Node) touchPeer(url string) {
+	if strings.TrimSpace(url) == "" {
+		return
+	}
+	n.mu.Lock()
+	if p, ok := n.peers[url]; ok {
+		p.LastSeen = time.Now()
 	}
 	n.mu.Unlock()
-	w.WriteHeader(http.StatusNoContent)
 }
 
 func (n *Node) peersHandler(w http.ResponseWriter, r *http.Request) {
@@ -283,6 +310,12 @@ func (n *Node) Serve() error {
 		n.loopAntiEntropy()
 	}()
 
+	n.wg.Add(1)
+	go func() {
+		defer n.wg.Done()
+		n.loopHello()
+	}()
+
 	// http server
 	errc := make(chan error, 1)
 	go func() {
@@ -467,28 +500,100 @@ func (n *Node) loopBeaconRecv() {
 /*** Outgoing ***/
 
 func (n *Node) sendHello(url string) error {
-	p := n.self
+	b, _ := json.Marshal(struct {
-	b, _ := json.Marshal(p)
+		URL string `json:"url"`
+	}{URL: n.self.URL})
 	req, _ := http.NewRequest(http.MethodPost, strings.TrimRight(url, "/")+"/mesh/hello", bytes.NewReader(b))
 	req.Header.Set("X-Mesh-Sig", n.sign(b))
+
 	resp, err := n.client.Do(req)
-	if err == nil {
+	if err != nil {
+		return err
+	}
 	io.Copy(io.Discard, resp.Body)
 	resp.Body.Close()
+	if resp.StatusCode == http.StatusOK {
+		n.touchPeer(url) // eigenen Blick auf den Peer direkt als „gesehen“ markieren
+		return nil
+	}
+	return fmt.Errorf("hello %s: %s", url, resp.Status)
+}
+
+func (n *Node) loopHello() {
+	interval := n.cfg.HelloInterval
+	if interval <= 0 {
+		interval = 20 * time.Second
+	}
+	fanout := n.cfg.HelloFanout
+	if fanout <= 0 {
+		fanout = 8
+	}
+
+	t := time.NewTicker(interval)
+	defer t.Stop()
+
+	for {
+		select {
+		case <-n.stop:
+			return
+		case <-t.C:
+		}
+
+		// Liste der *bekannten* Peers (nicht nur Seeds)
+		n.mu.RLock()
+		targets := make([]string, 0, len(n.peers))
+		for url := range n.peers {
+			if url != n.self.URL {
+				targets = append(targets, url)
+			}
+		}
+		n.mu.RUnlock()
+		if len(targets) == 0 {
+			continue
+		}
+
+		// zufällig mischen und auf Fanout begrenzen
+		rand.Shuffle(len(targets), func(i, j int) { targets[i], targets[j] = targets[j], targets[i] })
+		if fanout < len(targets) {
+			targets = targets[:fanout]
+		}
+
+		// leicht parallel pingen
+		var wg sync.WaitGroup
+		for _, u := range targets {
+			u := u
+			wg.Add(1)
+			go func() {
+				defer wg.Done()
+				_ = n.sendHello(u)
+			}()
+		}
+		wg.Wait()
 	}
-	return err
 }
 
 func (n *Node) sendSync(url string, s Snapshot) error {
 	b, _ := json.Marshal(s)
 	req, _ := http.NewRequest(http.MethodPost, strings.TrimRight(url, "/")+"/mesh/sync", bytes.NewReader(b))
 	req.Header.Set("X-Mesh-Sig", n.sign(b))
+
+	ctx, cancel := context.WithTimeout(context.Background(), 4*time.Second)
+	defer cancel()
+	req = req.WithContext(ctx)
+
 	resp, err := n.client.Do(req)
-	if err == nil {
+	if err != nil {
-		io.Copy(io.Discard, resp.Body)
-		resp.Body.Close()
-	}
 		return err
+	}
+	defer resp.Body.Close()
+	io.Copy(io.Discard, resp.Body)
+
+	if resp.StatusCode != http.StatusOK {
+		return fmt.Errorf("sync %s: %s", url, resp.Status)
+	}
+
+	n.touchPeer(url)
+	return nil
 }
 
 // PeerList liefert eine Kopie der bekannten Peers inkl. Self.
@@ -608,14 +713,37 @@ func (n *Node) blobHandler(w http.ResponseWriter, r *http.Request) {
 	_, _ = io.Copy(w, rc)
 }
 
-// interner Helper: signierter Blob-Request an einen Peer
+// sendBlobRequest schickt eine signierte Anfrage an /mesh/blob und liefert die Response
-func (n *Node) sendBlobRequest(url string, id string) (*http.Response, error) {
+// zurück (Caller MUSS resp.Body schließen!). Bei HTTP 200 wird der Peer als gesehen markiert.
+func (n *Node) sendBlobRequest(url, id string) (*http.Response, error) {
 	b, _ := json.Marshal(struct {
 		ID string `json:"id"`
 	}{ID: id})
+
 	req, _ := http.NewRequest(http.MethodPost, strings.TrimRight(url, "/")+"/mesh/blob", bytes.NewReader(b))
 	req.Header.Set("X-Mesh-Sig", n.sign(b))
-	return n.client.Do(req)
+	req.Header.Set("Content-Type", "application/json")
+
+	// ❗ WICHTIG: kein kurzer Timeout. Optional: großer Timeout aus Config
+	ctx := context.Background()
+	if n.cfg.BlobTimeout > 0 {
+		var cancel context.CancelFunc
+		ctx, cancel = context.WithTimeout(context.Background(), n.cfg.BlobTimeout)
+		defer cancel()
+	}
+	req = req.WithContext(ctx)
+
+	resp, err := n.client.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	if resp.StatusCode == http.StatusOK {
+		n.touchPeer(url) // ausgehender Erfolg zählt als "gesehen"
+		return resp, nil
+	}
+	io.Copy(io.Discard, resp.Body)
+	resp.Body.Close()
+	return nil, fmt.Errorf("blob %s from %s: %s", id, url, resp.Status)
 }
 
 // Öffentliche Methode: versuche Blob bei irgendeinem Peer zu holen