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# Meta-Fuse
Standalone virtual filesystem service that exposes metadata-organized content via FUSE and WebDAV without duplicating files.
## Overview
Meta-Fuse is a read-only process in the MetaMesh ecosystem that:
1. **Locates meta-core over UDP** - beacon v2 multicast advertise (`239.255.99.1:9099`); no shared volume, no `REDIS_URL`
2. **Reads metadata through meta-core's HTTP API** - `/meta/{hash}*` reads + SSE live updates on `/api/events/meta` (no direct Redis access)
3. **Mounts virtual filesystem** - Rust-based FUSE driver creates an organized view of media files
4. **Serves WebDAV** - Network-accessible, read-only file sharing for Windows/Mac/Linux clients, authenticated with per-device tokens
5. **Zero file duplication** - File bytes are read from meta-core's WebDAV (`http://<meta-core host>/webdav`), which also covers SMB/rclone mounts; no `/files` mount required
6. **Configurable renaming rules** - Virtual paths are computed from metadata by editable rules (dashboard rules editor)
## Architecture
```
┌─────────────────────────────────────────────────────────────────────────────┐
│ MetaMesh Ecosystem │
├─────────────────────────────────────────────────────────────────────────────┤
│ │
│ meta-core (owns Redis) │
│ ┌──────────────────────────────────────────────┐ │
│ │ UDP announce (beacon v2, /urls) │ │
│ │ HTTP API: /meta/{hash}*, /api/events/meta │ │
│ │ WebDAV: /webdav (file bytes, /files/...) │ │
│ └──────────────────────────────────────────────┘ │
│ ▲ metadata (HTTP + SSE) ▲ file bytes (WebDAV Range) │
│ ┌────────┴────────────────────────────────┴───────────────────┐ │
│ │ META-FUSE │ │
│ │ ┌─────────────────────────────────────────────────────────┐│ │
│ │ │ Storage client (KVManager / LeaderClient) ││ │
│ │ │ - Locates meta-core via UDP (or META_CORE_URL pin) ││ │
│ │ │ - Reads metadata over HTTP, events over SSE ││ │
│ │ │ - Reconnects when a different meta-core announces ││ │
│ │ └─────────────────────────────────────────────────────────┘│ │
│ │ │ │ │
│ │ ┌─────────────┴─────────────┐ │ │
│ │ ▼ ▼ │ │
│ │ ┌───────────────────────┐ ┌─────────────────────────┐ │ │
│ │ │ FUSE API Server │ │ WebDAV Server │ │ │
│ │ │ (Node.js/Fastify) │ │ (WsgiDAV, token auth)│ │ │
│ │ │ Port 3000 │ │ Port 8080 │ │ │
│ │ └───────────┬───────────┘ └───────────┬─────────────┘ │ │
│ │ │ │ │ │
│ │ ▼ │ │ │
│ │ ┌───────────────────────┐ │ │ │
│ │ │ FUSE Driver │◄──────────────┘ │ │
│ │ │ (Rust) │ │ │
│ │ │ /mnt/virtual │ │ │
│ │ └───────────────────────┘ │ │
│ └─────────────────────────────────────────────────────────────┘ │
│ │ │
│ ▼ │
│ ┌─────────────────────────┐ │
│ │ nginx (port 80) │ │
│ │ / → UI │ │
│ │ /webdav → WebDAV │ │
│ │ /api/ → API │ │
│ │ /health → API │ │
│ └─────────────────────────┘ │
│ │ │
└────────────────────────────┼────────────────────────────────────────────────┘
▼
External Clients
(Windows/Mac/Linux)
```
In the dev stack and the CasaOS store app (`packages/MetaAppStore`, app `MetaFuse`) the backend runs as `metafuse-app` behind an OIDC perimeter container `metafuse` (`nginx-hash-lock` in dev, `appshield` in the store app); in the store app Caddy routes `/health` and `/webdav*` straight to the backend, so WebDAV is authenticated by WebDAV tokens instead. See the meta-root [authentication architecture](../../docs/project-architecture/authentication.md).
### Service Role in MetaMesh
```
┌────────────────────────────────────────────────────────────────────────────┐
│ SERVICE ROLES │
├────────────────────────────────────────────────────────────────────────────┤
│ │
│ [1] meta-core (STORE) │
│ └─► Owns Redis, metadata HTTP API, event streams, WebDAV over /files │
│ │
│ [2] meta-sort (PROCESS-WRITE) │
│ └─► Watches folders, writes metadata through meta-core │
│ │
│ [3] meta-fuse (PROCESS-READ) ◄── YOU ARE HERE │
│ └─► Reads metadata from meta-core, exposes virtual filesystem │
│ │
│ [4] meta-stremio (PROCESS-READ) │
│ └─► Reads metadata, streams media content │
│ │
└────────────────────────────────────────────────────────────────────────────┘
```
### Locating meta-core (beacon v2)
meta-core announces itself on UDP multicast `239.255.99.1:9099`, carrying its `/urls` payload. meta-fuse listens (and announces itself on the same group, so it shows up in every neighbour's nav menu):
```
/urls payload (JSON):
{
"hostname": "metacore-app",
"baseUrl": "https://metacore-dev.localhost:8083",
"apiUrl": "http://<meta-core ip>:9000",
"redisUrl": "", # always empty since the api-mediated-access lockdown
"webdavUrl": "https://metacore-dev.localhost:8083/webdav",
"webdavUrlInternal": "http://<meta-core ip>:9000/webdav"
}
Discovery flow:
1. meta-core advertises `metamesh.core` with its /urls payload (`data.urls`)
2. meta-fuse picks it up (or uses META_CORE_URL and GET {url}/urls when pinned)
3. meta-fuse reads metadata from apiUrl (/meta/{hash}*) and streams apiUrl/api/events/meta
4. File bytes are fetched from http://<hostname>/webdav
5. An announce carrying a different apiUrl triggers a reconnect
```
**Note**: meta-fuse never owns storage. If meta-core still publishes a non-empty `redisUrl`, meta-fuse refuses to start (set `ALLOW_LEGACY_REDIS_URL=1` to downgrade that to a warning). Protocol spec: [beacon-v2.md](../../docs/project-architecture/beacon-v2.md).
## Core Features
### Virtual Filesystem (FUSE)
- **Organized view**: Files appear in categorized folders (Movies, TV, Anime, etc.)
- **Path-to-inode mapping**: Translates filesystem paths to FUSE inode numbers
- **Attribute caching**: 1-second TTL for file attributes
- **Directory caching**: 30-second TTL for directory listings
- **Error resilience**: Virtual `ERROR.txt` shown after 3 consecutive API failures
- **WebDAV reads**: The driver issues HTTP Range requests against the `webdavUrl` returned by `/api/fuse/read`
### WebDAV Server
- **Network file sharing**: Mount as network drive on any OS
- **Read-only access**: Prevents accidental modifications
- **Per-device tokens**: Minted/revoked from the dashboard (`/api/webdav-tokens`); the token (`mfwd_…`) is the basic-auth password, any non-empty username is accepted. Only sha256 hashes are stored (`$CONFIG_DIR/webdav-tokens.json`); revocation is immediate
- **Directory browsing**: Web-based file browser
### Renaming Rules
- Stored in `$CONFIG_DIR/renaming-rules.json` (timestamped backups on update)
- Template variables + conditions; preview and validate via the API before saving
- Only the metadata properties the rules reference are fetched (`RulesPropertyExtractor`)
## Package Structure
```
meta-fuse/
├── packages/
│ ├── meta-fuse-core/ # Core service (@meta-fuse/core)
│ │ ├── src/
│ │ │ ├── api/APIServer.ts # Fastify REST API
│ │ │ ├── config/ConfigStorage.ts # Renaming-rules persistence
│ │ │ ├── discovery/meshdisco.ts # beacon v2 (mirrored, see scripts/check-mirrors.sh)
│ │ │ ├── kv/ # Storage client (read-only)
│ │ │ │ ├── IKVClient.ts # Read-only interface
│ │ │ │ ├── KVManager.ts # meta-core location, connection management
│ │ │ │ ├── LeaderClient.ts # Adapter over MetaCoreLocator (UDP / META_CORE_URL pin)
│ │ │ │ ├── MetaCoreApiClient.ts # HTTP reads: /meta, /meta/{hash}, /meta/{hash}/{prop}
│ │ │ │ ├── SSEEventClient.ts # SSE consumer for /api/events/meta
│ │ │ │ └── RedisClient.ts # Storage facade (HTTP-only mode when redisUrl is empty)
│ │ │ ├── vfs/ # Virtual filesystem logic
│ │ │ │ ├── VirtualFileSystem.ts # In-memory VFS representation
│ │ │ │ ├── StreamingStateBuilder.ts # Event-driven state management
│ │ │ │ ├── RulesPropertyExtractor.ts # Property filtering from rules
│ │ │ │ ├── MetaDataToFolderStruct.ts # Folder organization
│ │ │ │ ├── RenamingRule.ts # Virtual path rules
│ │ │ │ ├── defaults/ # Default renaming rules
│ │ │ │ ├── template/ # TemplateEngine, ConditionEvaluator
│ │ │ │ └── types/ # RenamingRuleTypes.ts
│ │ │ ├── webdav/TokenStore.ts # Per-device WebDAV tokens
│ │ │ └── index.ts # Entry point
│ │ ├── package.json
│ │ └── tsconfig.json
│ │
│ ├── meta-fuse-driver/ # Rust FUSE driver (fuser)
│ │ ├── src/
│ │ │ ├── main.rs # Entry point, FUSE ops, inode mapping
│ │ │ └── api_client.rs # HTTP client to API server
│ │ ├── Cargo.toml
│ │ └── Cargo.lock
│ │
│ └── meta-fuse-ui/ # Dashboard (Vite + React): stats, rules editor, WebDAV tokens
│
├── docs/ # Architecture documentation
├── docker/
│ ├── nginx.conf # Reverse proxy config
│ ├── wsgidav.yaml # WebDAV server config
│ ├── webdav_token_controller.py # WsgiDAV DomainController (token auth)
│ ├── supervisord.conf # Process management
│ ├── start-fuse-driver.sh # Waits for the API, then mounts
│ └── welcome.html
│
├── Dockerfile
├── docker-compose.yml # Legacy standalone example (see note below)
├── package.json # Workspace root
└── pnpm-workspace.yaml
```
### Key Components (meta-fuse-core)
| Component | File | Purpose |
|-----------|------|---------|
| Entry Point | `src/index.ts` | Initializes KV manager, VFS, SSE consumer, API server |
| API Server | `src/api/APIServer.ts` | Fastify REST API for FUSE operations, rules, tokens, neighbours |
| KV Manager | `src/kv/KVManager.ts` | Never owns storage: locates meta-core, builds the client, reconnects |
| Leader Client | `src/kv/LeaderClient.ts` | Locates meta-core over UDP (name is legacy: no election involved) |
| meta-core API Client | `src/kv/MetaCoreApiClient.ts` | `/meta/{hash}/{prop}`, `/meta/{hash}`, `/meta` reads |
| SSE Event Client | `src/kv/SSEEventClient.ts` | Consumes `/api/events/meta` (replays from `0-0` every start) |
| Virtual FS | `src/vfs/VirtualFileSystem.ts` | In-memory VFS representation with caching |
| Streaming State Builder | `src/vfs/StreamingStateBuilder.ts` | Turns `meta:events` into VFS state incrementally |
| Rules Property Extractor | `src/vfs/RulesPropertyExtractor.ts` | Extracts VFS-relevant properties from renaming rules |
| Folder Organizer | `src/vfs/MetaDataToFolderStruct.ts` | Converts flat metadata to organized folder structure |
| Template Engine | `src/vfs/template/TemplateEngine.ts` | Variable interpolation for renaming templates |
| Condition Evaluator | `src/vfs/template/ConditionEvaluator.ts` | Evaluates rule conditions against file metadata |
| Token Store | `src/webdav/TokenStore.ts` | Mints/lists/revokes WebDAV tokens |
## Configuration
### Environment Variables
```bash
# meta-core location
META_CORE_URL= # Pin meta-core's API URL; UDP discovery never overrides it
ENABLE_UDP_DISCOVERY=true # false/0 disables meta-discovery
ALLOW_LEGACY_REDIS_URL= # 1 = warn instead of fail if meta-core publishes redisUrl
# Announce / nav menu
BASE_URL= # External (Caddy) URL
PUBLIC_URL= # Wins over BASE_URL (debug-direct port, no Caddy)
# Paths
FILES_VOLUME=/files # Prefix for the relative filePath of each record
CONFIG_DIR=/meta-fuse/config # renaming-rules.json, webdav-tokens.json
# API Server
API_PORT=3000 # API server port
API_HOST=0.0.0.0 # API bind address
# VFS attributes (core)
FUSE_FILE_MODE=644 # File permissions (octal)
FUSE_DIR_MODE=755 # Directory permissions (octal)
PUID=1000 # File owner uid (core + driver)
PGID=1000 # File owner gid (core + driver)
# FUSE driver (args: <mountpoint> [api-url] [uid] [gid])
FUSE_API_URL=http://localhost:3000 # Used when api-url arg is omitted
FUSE_FILE_PERM / FUSE_DIR_PERM # Driver-side permission overrides
# Mount always uses allow_other (needs user_allow_other in /etc/fuse.conf)
# WsgiDAV
TOKEN_STORE_PATH=/meta-fuse/config/webdav-tokens.json
```
### Docker Compose
The CasaOS store app (`packages/MetaAppStore/Apps/MetaFuse/docker-compose.yml`) is the reference deployment. Trimmed:
```yaml
services:
metafuse-app:
image: ghcr.io/worph/meta-fuse:<version>
privileged: true # Required for FUSE
cap_add: [SYS_ADMIN, DAC_READ_SEARCH, DAC_OVERRIDE]
devices:
- /dev/fuse:/dev/fuse
security_opt:
- apparmor:unconfined
expose:
- 80 # nginx (UI, API, WebDAV)
volumes:
# No /meta-core mount (UDP discovery), no /files mount (WebDAV via meta-core)
- ${DATA_ROOT:-/DATA}/MetaFuse/Library:/mnt/virtual:shared # FUSE mount output
- ${DATA_ROOT:-/DATA}/AppData/metafuse/config:/meta-fuse/config:rw
environment:
- CONFIG_DIR=/meta-fuse/config
- BASE_URL=https://metafuse-$APP_DOMAIN
networks: [pcs] # must share a multicast-capable network with meta-core
```
The repo-root `docker-compose.yml` predates meta-core (it sets `REDIS_URL` and mounts `/data`) and is not representative.
## API Endpoints
### FUSE API (Port 3000, proxied by nginx under `/api/` and `/health`)
| Method | Endpoint | Description |
|--------|----------|-------------|
| **Health & Status** |
| GET | `/health` | Health check |
| GET | `/api/health` | Health check (alias) |
| GET | `/api/fuse/health` | Health check (alias) |
| GET | `/api/fuse/stats` | Filesystem statistics |
| **FUSE Operations** |
| POST | `/api/fuse/readdir` | List directory contents |
| POST | `/api/fuse/getattr` | Get file/directory attributes |
| POST | `/api/fuse/exists` | Check path existence |
| POST | `/api/fuse/read` | Resolve file content (source path / WebDAV URL) |
| POST | `/api/fuse/metadata` | Get full metadata for a path |
| GET | `/api/fuse/files` | List all virtual files |
| GET | `/api/fuse/directories` | List all virtual directories |
| POST | `/api/fuse/refresh` | Trigger VFS refresh (replays the event stream) |
| **Renaming Rules** |
| GET | `/api/fuse/rules` | Get current renaming rules configuration |
| PUT | `/api/fuse/rules` | Update renaming rules configuration |
| POST | `/api/fuse/rules/preview` | Preview how files would be renamed |
| POST | `/api/fuse/rules/validate` | Validate a single rule |
| GET | `/api/fuse/rules/variables` | Get list of available template variables |
| **WebDAV Tokens** |
| GET | `/api/webdav-tokens` | List tokens (hashes/prefixes only) |
| POST | `/api/webdav-tokens` | Create a token (`{ "label": "..." }`); plaintext returned once |
| DELETE | `/api/webdav-tokens/:id` | Revoke a token |
| **Service Discovery** |
| GET | `/api/neighbors` | Services heard over beacon v2 (nav menu) |
### Example Responses
**GET /api/fuse/stats**
```json
{
"fileCount": 1523,
"directoryCount": 48,
"totalSize": 1847392847362,
"lastRefresh": "2026-01-15T10:30:00.000Z",
"redisConnected": true
}
```
**POST /api/fuse/readdir**
```json
// Request
{ "path": "/Movies" }
// Response
{
"entries": ["Action", "Comedy", "Drama", "Sci-Fi"]
}
```
**POST /api/fuse/getattr**
```json
// Request
{ "path": "/Movies/Action/Movie.mkv" }
// Response (mode includes the file-type bits; times are epoch seconds)
{
"size": 4831838208,
"mode": 33188,
"mtime": 1705314600,
"atime": 1705314600,
"ctime": 1705314600,
"nlink": 1,
"uid": 1000,
"gid": 1000
}
```
## Usage
### Docker
```bash
# Build the image (bundles UI, backend, FUSE driver, WsgiDAV, nginx)
docker build -t meta-fuse .
# Check health (through nginx on port 80)
curl http://localhost/health
```
Images are published to `ghcr.io/worph/meta-fuse` by `.github/workflows/docker-publish.yml`. In the meta-root dev stack the service is `metafuse-app` (`https://metafuse-dev.localhost:8181` via Caddy, debug-direct `http://localhost:18181`); rebuild it with `dev/scripts/reload-meta-fuse.sh`.
### Mount WebDAV
Create a token in the dashboard (WebDAV tokens panel) first; use it as the password. The username can be anything non-empty.
```powershell
# Windows
net use Z: https://<metafuse host>/webdav /user:me mfwd_xxxxxxxx
dir Z:\Movies
```
```bash
# Linux (davfs2)
sudo apt-get install davfs2
mkdir -p ~/meta-fuse
sudo mount -t davfs https://<metafuse host>/webdav ~/meta-fuse
# Credentials: any username / your mfwd_ token
ls ~/meta-fuse/Movies
```
```bash
# macOS: Finder → Go → Connect to Server → https://<metafuse host>/webdav
```
## Development
### Prerequisites
- Node.js 21.6.2+
- pnpm
- Rust 1.89+ (for FUSE driver; the Dockerfile builds with `rust:1.89-bookworm`)
- Docker & Docker Compose
### Local Development
```bash
pnpm install
pnpm run build # all packages
pnpm run dev # tsc --watch (core) + vite (ui), in parallel
pnpm run test # @meta-fuse/core (mocha)
pnpm run lint
```
Inside the meta-root, prefer the dev stack's in-container build (`dev/scripts/reload-meta-fuse.sh`) — see the meta-root [CLAUDE.md](../../CLAUDE.md).
### Building FUSE Driver
```bash
cd packages/meta-fuse-driver
cargo build --release --locked
# Run driver: <mountpoint> [api-url] [uid] [gid]
./target/release/meta-fuse-driver /mnt/virtual http://localhost:3000
```
### Project Scripts
| Command | Description |
|---------|-------------|
| `pnpm run build` | Build all packages |
| `pnpm run dev` | Development mode with hot reload |
| `pnpm run start` / `start:core` | Start core service |
| `pnpm run start:ui` | Start UI dev server |
| `pnpm run test` | Run core tests |
| `pnpm run lint` | Lint all packages |
## How It Works
### Virtual Filesystem Flow
```
1. Client opens /mnt/virtual/Movies/Action/Movie.mkv
│
▼
2. FUSE driver receives the request
- Converts path to inode
- Calls API: POST /api/fuse/getattr, then /api/fuse/read
│
▼
3. API server resolves the path from its in-memory VFS
- Returns a webdavUrl on meta-core's WebDAV for the source file
│
▼
4. FUSE driver reads byte ranges from that URL (HTTP Range)
│
▼
5. Content streamed to client
- No file duplication
- Bytes come from the original location via meta-core
```
### Metadata Access
meta-fuse never talks to Redis. It reads records through meta-core's HTTP API:
```
GET /meta → { hashIds: [...] } enumerate records
GET /meta/{hash} → { metadata: {...} } full flat record
GET /meta/{hash}/{prop} → text/plain value one property (e.g. titles/eng)
# VFS paths are computed from metadata by the renaming rules, e.g.
# /Movies/Inception (2010)/Inception.mkv
# → filePath "media1/Movies/Inception (2010)/Inception.mkv" (relative to FILES_VOLUME)
```
Field names and value formats: meta-root [METADATA_KEYS.md](../../METADATA_KEYS.md). File paths are **relative to FILES_VOLUME** (`/files`).
### Real-Time Updates via SSE
meta-fuse consumes meta-core's `meta:events` stream through SSE at `GET {apiUrl}/api/events/meta`. Each event is a property change:
```typescript
// SSE event → StreamMessage
{
id: string; // Stream entry ID (e.g., "1703808000000-0")
type: 'set' | 'del'; // SSE event name
key: string; // e.g. "file:abc123/title"
}
```
**Startup Sequence**:
1. **Bootstrap**: VFS state is held only in memory, so every start replays from cursor `0-0` (the cursor is deliberately not persisted; a `gap` event resumes from the oldest retained entry)
2. **Build State**: Parse `file:{hashId}/{property}`, skip properties the rules don't use, fetch the rest
3. **Go Live**: Keep consuming new events; a file appears in the VFS once it has a `filePath`
---
## Troubleshooting
### FUSE Mount Not Working
```bash
ls -la /dev/fuse # FUSE available?
mount | grep virtual # mounted?
curl http://localhost/api/fuse/health
# Driver logs (inside the container)
tail -f /var/log/supervisor/fuse-driver.log /var/log/supervisor/fuse-driver_error.log
```
### meta-core Not Found
```bash
# Who this service hears over UDP
curl http://localhost/api/neighbors
# meta-core's own view + URLs
curl -k https://metacore-dev.localhost:8083/api/neighbors
curl -k https://metacore-dev.localhost:8083/api/urls
# meta-fuse logs
docker logs metafuse-app | grep -E "LeaderClient|KVManager|SSE"
```
If multicast can't cross your network, pin it with `META_CORE_URL`.
### WebDAV Not Accessible
```bash
curl -u me:mfwd_xxxxxxxx http://localhost/webdav/ # 401 = bad/revoked token
docker exec metafuse-app tail /var/log/supervisor/wsgidav_error.log
```
### Files Not Appearing
```bash
curl http://localhost/api/fuse/stats
docker logs metafuse-app | grep "State builder"
curl -k https://metacore-dev.localhost:8083/api/stats # does meta-core have records?
```
## Technology Stack
| Component | Technology | Purpose |
|-----------|------------|---------|
| Core Service | Node.js + TypeScript | API server, VFS logic |
| HTTP Framework | Fastify 5.x | REST API |
| FUSE Driver | Rust + fuser | Filesystem interface |
| WebDAV | WsgiDAV (Python) + token DomainController | Network file sharing |
| Metadata | meta-core HTTP API + SSE | Reads and live updates |
| Discovery | beacon v2 (UDP multicast) | Locating meta-core and neighbours |
| Reverse Proxy | nginx | Request routing |
| Containerization | Docker + supervisord | Deployment |
## Integration with MetaMesh
- **meta-core**: Source of metadata (HTTP/SSE) and file bytes (WebDAV)
- **meta-sort**: Produces the metadata meta-fuse organizes
- **meta-stremio**: Reads the same metadata for streaming
```bash
# Is meta-sort producing records?
curl -k https://metasort-dev.localhost:8180/api/processing/status
curl -k https://metacore-dev.localhost:8083/api/stats
```
## Documentation
- [VFS Rebuild Architecture](docs/vfs-rebuild-architecture.md) - How VFS state is built from the event stream
- [Streaming Architecture](docs/streaming-architecture.md) - Event processing pipeline details
- [API Reference](docs/api-reference.md) - REST API documentation
(These predate the HTTP/SSE migration in places; the code is authoritative.)
## License
MIT (see `package.json`).
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