README: sync with current code
This commit is contained in:
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@@ -1,34 +1,42 @@
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# meta-core
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Standalone Go service that owns Redis, the leader-info file, the HTTP+SSE
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metadata surface, and a WebDAV file server for the MetaMesh dev/prod stack.
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Standalone Go service that owns Redis, the HTTP+SSE metadata surface, the
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User Data Layer store and signing keystore, and a WebDAV file server for the
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MetaMesh dev/prod stack.
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## Overview
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meta-core runs as its own container (`metacore-app`). Other MetaMesh services
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(meta-sort, meta-fuse, meta-stremio, meta-dup, meta-share) discover it by
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reading `/meta-core/locks/kv-leader.info` and then call its HTTP API. Redis
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is not exposed outside the container — all metadata I/O is mediated by the
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HTTP API.
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(meta-sort, meta-fuse, meta-stremio, meta-dup, meta-search, meta-share,
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meta-gateway, meta-watch, …) locate it over UDP multicast (meta-discovery v1 —
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its `role=core` announce carries the full `/urls` payload) and then call its
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HTTP API. `META_CORE_URL` on a client pins it instead. Redis is not published
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outside the container — all metadata I/O is mediated by the HTTP/SSE API
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(see [`docs/api-mediated-access.md`](docs/api-mediated-access.md)).
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### Key capabilities
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| Feature | Description |
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|---------|-------------|
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| **Leader gate** | Bash `flock` loop in `docker/leader-election.sh` only `exec`s supervisord on the winner. The Go binary therefore only ever runs as leader. |
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| **Redis-volume mutex** | Bash `flock` loop in `docker/leader-election.sh` only `exec`s supervisord on the winner, so two containers sharing one `/meta-core` volume can never run two Redis writers. It is a mutex, not discovery — nothing reads the lock. |
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| **Redis owner** | Supervisord starts Redis with AOF + RDB persistence inside the container; meta-core connects to it on localhost. |
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| **HTTP API** | Typed REST surface (gorilla/mux) for metadata, KV browsing, snapshots, schema inference, mounts, watchers, neighbours, and file access by CID. |
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| **HTTP API** | Typed REST surface (gorilla/mux) for metadata, KV browsing, snapshots, schema inference, mounts, watchers, neighbours, identity, UDL, and file access by CID. |
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| **In-memory search index** | `POST /api/metadata/search` matches against an in-memory snapshot of every record, kept current by incremental refreshes (full reconcile every 30 min) — no Redis round-trip per record on the request path (`internal/api/search_index.go`). |
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| **SSE event streams** | `/api/events/files` and `/api/events/meta` mirror the underlying Redis Streams so external services never speak Redis. |
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| **WebDAV server** | `/webdav/*` exposes the `/files` volume (read+write) for cross-service file access. nginx in front of meta-core handles caching. |
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| **Service discovery** | meta-discovery v1: UDP multicast announce/listen on `239.255.77.1:9399`, neighbours served at `/neighbors`. The file-based registry under `/meta-core/services/*.json` it replaced is gone. |
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| **File watcher / scanner** | Recursive scan + MidHash256 computation; emits events on `file:events`. |
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| **File watcher / scanner** | Recursive scan + MidHash256 computation; emits events on `file:events`. Watched roots are POSTed watcher configs (`/meta-core/watchers.json`), not env vars. |
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| **Mount management** | rclone-only mount manager (SMB rendered into `:smb:`, plus pre-defined remotes). Read-only by construction. |
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| **UUID-rooted storage** | Roots are UUIDv7 (Crockford Base32, ULID layout); CIDs are reverse-index aliases. Schema-version sentinel refuses to boot against stale data. |
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| **Identity keystore** | Multi-account secp256k1 signing keys under `/meta-core/identity/accounts/`, created from the dashboard's Identity menu (never auto-generated). A private key is returned only by generate, or by reveal against a proof-of-possession signature (delete needs the same proof); `/api/identity/sign` refuses challenge-domain payloads. |
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| **User Data Layer** | Version-gated store for per-user signed (and, for private-tier keys, encrypted) records — My List, Continue Watching, ratings — indexed by user and CID. meta-core never inspects the crypto. See [User Data Layer](../../docs/project-architecture/user-data-layer.md). |
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| **Dashboard + editor** | nginx serves a React dashboard at `/` and the standalone metadata editor at `/editor/`. |
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### Design characteristics
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- **Single-leader** — flock on a shared volume; no external consensus.
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- **HTTP-only externally** — Redis is bound to the container, never published.
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- **Single writer** — flock on the `/meta-core` volume; no external consensus.
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- **HTTP-only externally** — Redis is never published by the compose stacks;
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debug with `docker exec metacore-app redis-cli …`.
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- **Schema-gated boot** — `EnsureSchemaVersion` aborts startup when the
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on-disk Redis layout predates the current build (alpha clean-wipe policy;
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see `docs/uuid-rooted-metadata.md`).
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@@ -41,34 +49,31 @@ HTTP API.
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┌──────────────────────────────────────────────────────────────────────────┐
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│ metacore-app (standalone container) │
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│ │
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│ leader-election.sh (flock /meta-core/locks/kv-leader.lock, │
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│ then exec supervisord) │
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│ supervisord │
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│ ├─ leader-election.sh (flock /meta-core/locks/kv-leader.lock, │
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│ │ writes kv-leader.info, exec supervisord) │
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│ ├─ redis-server (AOF + RDB on /meta-core/db/redis) │
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│ ├─ nginx (TLS termination, proxy_cache for /webdav) │
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│ ├─ rclone rcd (mount daemon, RC API) │
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│ ├─ nginx :80 (dashboard, /editor, API proxy, │
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│ │ proxy_cache for /webdav, rclone GUI /rclone) │
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│ ├─ rclone rcd (mount daemon, RC API on :5572) │
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│ ├─ mount-watcher.sh (rclone mount lifecycle) │
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│ └─ meta-core (Go) ─► HTTP API + SSE + WebDAV on :9000 │
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│ ─► UDP announce/listen 239.255.77.1:9399 │
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└──────────────────────────────────────────────────────────────────────────┘
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│
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┌──────────────────────┴──────────────────────┐
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│ /meta-core (shared volume) │
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│ locks/kv-leader.{lock,info} │
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│ /meta-core (meta-core's own volume) │
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│ locks/kv-leader.lock │
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│ db/redis/ │
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│ services/*.json │
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│ identity/accounts/*.json │
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│ mounts/{mounts.json, errors/} │
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│ watchers.json │
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│ cache/ (nginx proxy_cache) │
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└─────────────────────────────────────────────┘
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▲
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┌──────────────────────────────┼────────────────────────────────┐
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│ │ │
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┌─────────────┐ ┌─────────────┐ ┌─────────────┐
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│ meta-sort │ │ meta-fuse │ │ meta-stremio│
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│ │ │ │ │ │
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│ reads │ HTTP+SSE │ reads │ HTTP+SSE │ reads │
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│ leader.info├──────────────►│ leader.info├───────────────►│ leader.info│
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└─────────────┘ └─────────────┘ └─────────────┘
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meta-sort / meta-fuse / meta-stremio / meta-search / meta-share / …
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│ 1. hear role=core announce on UDP multicast (carries /urls)
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└─ 2. HTTP + SSE (+ WebDAV) to metacore-app — never Redis, never the volume
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```
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## Quick start
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@@ -82,8 +87,9 @@ make test # run Go unit tests
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```
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`make docker` tags the image as `:1.0.0`, `:latest`, **and** `:local`. The
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`:local` tag is the one every sub-stack docker-compose.yml references
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(meta-share 10-peer federation, meta-gateway dev stacks); without it the
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`:local` tag is the one the sub-stack docker-compose files reference
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(meta-share federation, meta-read and meta-listen dev stacks); the meta-gateway
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dev stack (`docker-compose.gateway.yml`) uses `:latest`. Without these tags the
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sub-stacks can't see a freshly-built image by name.
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> **Source-change → recreate.** `make docker` rebuilds and re-tags the
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@@ -94,12 +100,14 @@ sub-stacks can't see a freshly-built image by name.
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>
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> ```bash
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> make docker
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> docker compose -f packages/meta-gateway/dev/docker-compose.yml \
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> up -d --force-recreate metagateway-generic-core
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> docker compose -f packages/meta-gateway/dev/docker-compose.torznab.yml \
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> up -d --force-recreate metagateway-torznab-core
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> docker compose -f packages/meta-gateway/dev/docker-compose.gateway.yml \
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> up -d --force-recreate metagateway-hub-metacore
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> docker compose -f packages/meta-share/dev/docker-compose.yml \
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> --profile share-10node up -d --force-recreate metashare-core metashare-core-test
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> docker compose -f packages/meta-read/dev/docker-compose.yml \
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> up -d --force-recreate metaread-dev-core
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> docker compose -f packages/meta-listen/dev/docker-compose.yml \
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> up -d --force-recreate metalisten-dev-core
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> ```
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>
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> The symptom of a missed recreate is missing API fields on `/urls`
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@@ -109,7 +117,7 @@ sub-stacks can't see a freshly-built image by name.
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>
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> ```bash
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> docker inspect meta-core:local --format '{{.Id}}' # fresh SHA
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> docker ps --filter ancestor=meta-core:local --format '{{.Names}}'
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> docker ps --filter ancestor=meta-core:local --format '{{.Names}}' # repeat for :latest
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> # any container whose Image SHA doesn't match the fresh SHA needs --force-recreate.
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> ```
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@@ -126,36 +134,39 @@ HTTP port (no auth, bypasses Caddy) is `http://localhost:18083`.
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## Configuration
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Environment variables consumed by `internal/config/config.go`:
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Environment variables (from `internal/config/config.go` unless noted):
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| Variable | Default | Description |
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|---|---|---|
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| `META_CORE_PATH` | `/meta-core` | Shared volume root (locks, db, services, mounts, cache). |
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| `META_CORE_PATH` | `/meta-core` | meta-core's own volume root (lock, Redis data, identity, mounts, watchers, cache). No other service mounts it. |
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| `FILES_PATH` | `/files` | Files volume root. |
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| `SERVICE_NAME` | `meta-core` | Identity in the service registry. |
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| `SERVICE_VERSION` | `1.0.0` | Reported via `/status` and registry. |
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| `API_PORT` | `8180` | External port baked into the leader-info `baseUrl`. |
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| `BASE_URL` | _empty_ | Overrides the constructed `baseUrl` if set (used for HTTPS perimeter). |
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| `SERVICE_NAME` | `meta-core` | Name in the meta-discovery announce. |
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| `SERVICE_VERSION` | `1.0.0` | Reported via `/status`. |
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| `API_PORT` | `8180` | External port baked into the constructed `baseUrl` when `BASE_URL` is unset. |
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| `BASE_URL` | _empty_ | Overrides the constructed `baseUrl` (the Caddy/HTTPS perimeter URL). |
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| `META_CORE_PUBLIC_URL` | _empty_ | Browser-facing nav URL in the announce; wins over `BASE_URL` (e.g. a debug-direct port with no Caddy). |
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| `REDIS_PORT` | `6379` | Local Redis port. |
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| `META_CORE_HTTP_PORT` | `9000` | Go HTTP+SSE+WebDAV port. |
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| `META_CORE_HTTP_HOST` | `0.0.0.0` | HTTP bind. |
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| `HEALTH_CHECK_INTERVAL_MS` | `5000` | Internal health-loop cadence. |
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| `HEARTBEAT_INTERVAL_MS` | `30000` | Service registry heartbeat. |
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| `STALE_THRESHOLD_MS` | `60000` | Age past which a registry entry is marked stale. |
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| `CLEANUP_INTERVAL_MS` | `600000` | Dead-service cleaner cadence. |
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| `DEAD_SERVICE_THRESHOLD_MS` | `600000` | Age past which a stale entry is deleted. |
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| `WATCH_INTERVAL_MS` | `1000` | Watcher poll cadence. |
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| `DEBOUNCE_MS` | `30000` | File-event debounce window. |
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| `ENABLE_FILE_WATCHER` | `true` | Disable to suppress the in-process watcher entirely. |
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| `ENABLE_FILE_WATCHER` | `true` | Disable to suppress the in-process watcher entirely (`POST /api/files/register` stays available). |
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| `ENABLE_UDP_DISCOVERY` | `true` | meta-discovery v1 announce + listen. |
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| `DISCOVERY_GROUP` / `DISCOVERY_PORT` | `239.255.77.1` / `9399` | Multicast group and UDP port. |
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| `DISCOVERY_INTERVAL_MS` | `10000` | Unsolicited announce interval. |
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| `META_CORE_INDEX_EXCLUDE_PREFIXES` | `categories/newznab/` | Comma-separated field prefixes left out of the in-memory search index; set empty to index everything (`internal/storage/client.go`). |
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| `ELECTION_RETRY_SECS` | `5` | flock retry interval (read by `docker/leader-election.sh`, not the Go binary). |
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Note: there is no `META_CORE_REDIS_PORT`, no `META_CORE_SERVICE_NAME`, and
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no `META_CORE_LEADER_TIMEOUT`. The Redis URL is discovered locally; service
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identity uses `SERVICE_NAME`; leader timeout is governed by the bash flock
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retry interval (`ELECTION_RETRY_SECS`, default `5`).
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`HEALTH_CHECK_INTERVAL_MS`, `HEARTBEAT_INTERVAL_MS`, `STALE_THRESHOLD_MS`,
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`CLEANUP_INTERVAL_MS`, `DEAD_SERVICE_THRESHOLD_MS`, `WATCH_INTERVAL_MS` and
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`DEBOUNCE_MS` are still parsed by `internal/config/config.go` but nothing reads
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them (leftovers of the file-based registry); setting them has no effect. There
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is no `META_CORE_REDIS_PORT` / `META_CORE_SERVICE_NAME` /
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`META_CORE_LEADER_TIMEOUT`, and no `WATCH_PATHS` — watched folders are watcher
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configs created via `/api/watchers`.
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## API reference
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All endpoints below are served by `internal/api/server.go`. Examples assume
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All endpoints below are registered in `internal/api/server.go` (mounts,
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watcher and watchers routes in their own packages' `handlers.go`). Examples assume
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the in-container Go port `:9000`; from the host use
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`https://metacore-dev.localhost:8083` (Caddy) or `http://localhost:18083`
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(debug-direct).
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@@ -229,6 +240,8 @@ GET /api/meta/{cid} # resolve CID → metadata document
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GET /api/file/{cid}/info # CID resolution metadata
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GET /file/{cid} # serve file bytes (range-aware)
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POST /file/cid # compute CID for an uploaded file
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POST /api/files/register # mint + alias one file under /files/plugin by midhash
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# (the watcher's path for one file; works with the watcher OFF)
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HEAD /data/{hash} # existence + size
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GET /data/{hash}/path # absolute path on /files
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```
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@@ -280,6 +293,44 @@ signalling).
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```bash
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GET /api/events/files # file:events stream (watcher events)
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GET /api/events/meta # meta:events stream (metadata mutations)
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GET /api/events/poll # DEPRECATED long-poll over file:events — use SSE
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```
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### Identity (signing keystore)
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Reached through meta-search's identity proxy (and directly by meta-gateway,
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meta-read, meta-listen) for record signing, UDL writes and keypair sign-in.
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```bash
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GET /api/identity # status (never the private key)
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GET /api/identity/accounts
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POST /api/identity/generate # the only call that returns a new private key
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POST /api/identity/import
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POST /api/identity/challenge # one-shot challenge for proof-of-possession
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POST /api/identity/reveal # needs proof-of-possession
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DELETE /api/identity # needs proof-of-possession; reports purged UDL counts
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POST /api/identity/sign
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POST /api/identity/sign-batch
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GET /api/identity/aead-key
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```
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### User Data Layer
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Records arrive signed (private-tier ones encrypted) as opaque base64 CBOR;
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writes are version-gated (stale → `409 stale_version`, or `accepted:false` per
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cell in a batch). Redis model in `internal/storage/udl.go`.
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```bash
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GET /api/udl/record?uid&cid&key
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PUT /api/udl/record
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PUT /api/udl/records # batch
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GET /api/udl/user/{uid}/key/{key}
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GET /api/udl/user/{uid}/cid/{cid}
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GET /api/udl/user/{uid}/all
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GET /api/udl/user/{uid}/count
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GET /api/udl/cid/{cid}/users
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GET /api/udl/cid/{cid}/aggregate # meta-watch Aggregate wire shape
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GET /api/udl/users/stats
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```
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### Mounts
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@@ -319,6 +370,9 @@ return a deprecation pointer at the `/api/watchers/*` routes
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```bash
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POST /api/admin/migrate-dual-roots # reunify stranded midhash-rooted entries
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POST /api/admin/migrate-domain-screen # domain film|tv → screen, workForm backfill (idempotent)
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POST /api/admin/migrate-user-cids # backfill udl:idx:user:<uid>:cids; until run, pre-index
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# profiles export as EMPTY. Returns {fixed}
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POST /api/admin/sweep-literature-echoes[?apply=true]
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# strip query echoes off literature cards: anilistid on site cards,
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# workcid/chapterNumber/volumeNumber/chapterStart/chapterEnd on any card.
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@@ -329,32 +383,29 @@ GET/PUT/DELETE /webdav/... # mounted on /files
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No `/metrics` endpoint is exposed; observability is via container logs and
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the `/health` / `/status` JSON.
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## Leader gate
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## Redis-volume mutex
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Leader election is a bash flock loop in `docker/leader-election.sh`, not a
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Go-level state machine. When `flock` succeeds on `kv-leader.lock`, the
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script writes the leader API URL to `kv-leader.info` and `exec`s
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supervisord. When the process tree dies, the kernel releases the lock and
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any standby instance can take over. There is no follower path inside the
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Go binary — there is no `OnBecomeLeader` / `OnBecomeFollower` callback API.
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`docker/leader-election.sh` is a bash flock loop, not a Go-level state
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machine. When `flock` succeeds on `/meta-core/locks/kv-leader.lock`, the
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script `exec`s supervisord; a second container mounting the same volume
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retries every `ELECTION_RETRY_SECS` and stays dormant. When the process tree
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dies, the kernel releases the lock. There is no follower path inside the Go
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binary.
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`kv-leader.info` is a single plaintext line containing the API base URL:
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```
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http://10.0.1.50:9000
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```
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Other services read this file, then call `GET /urls` for full discovery.
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The dev compose runs a single `metacore-app`; the flock primitive is
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retained as a correctness anchor (one process owns Redis and the
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writable state under `/meta-core`), not as live failover.
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The lock is a **mutex, not service discovery** — it only stops two Redis
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writers landing on one RDB/AOF. Nothing reads it, and the `kv-leader.info`
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file it used to publish is gone: siblings locate meta-core over UDP
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(see [service-discovery.md](../../docs/project-architecture/service-discovery.md)).
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`internal/leader` keeps its name for history, but only builds the `/urls`
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payload (`baseUrl`, `apiUrl`, `webdavUrl`, `webdavUrlInternal`) that `/urls`
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and the UDP announce share.
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## Metadata storage shape (one-line summary)
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Roots are opaque UUIDv7 strings; every property is a separate Redis
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STRING at `file:<uuid>/<property>`; every known CID for a file is a
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reverse-index entry `cid:<algorithm>:<value> → <uuid>`. Full details in
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||||
STRING at `file:<uuid>/<property>`; every known CID is a key-set member
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`file:<uuid>/cids/<bareCid>` plus a reverse-index entry `cid:<bareCid> → <uuid>`
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(the canonical CID is derived by rank on read, never stored). Full details in
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[`docs/metadata-storage-structure.md`](docs/metadata-storage-structure.md)
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and design rationale in [`docs/uuid-rooted-metadata.md`](docs/uuid-rooted-metadata.md).
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The authoritative registry of field semantics and value formats lives in
|
||||
@@ -364,14 +415,15 @@ the repo-root [`METADATA_KEYS.md`](../../METADATA_KEYS.md).
|
||||
|
||||
| Package | Purpose |
|
||||
|---------|---------|
|
||||
| `cmd/meta-core` | Entry point; Redis connect + schema sentinel + service wiring. |
|
||||
| `cmd/meta-core` | Entry point; Redis connect + schema sentinel + UDP discovery + service wiring. |
|
||||
| `internal/config` | Env-driven configuration, path helpers. |
|
||||
| `internal/leader` | `LeaderInfoProvider` (builds the leader info from local hostname/IP/config; no election logic). |
|
||||
| `internal/storage` | Redis wrapper (`client.go`), UUIDv7 minting (`uuid.go`), CID reverse index (`cid_resolution.go`), schema sentinel (`schema_version.go`), dual-root migration (`dual_root_migration.go`). |
|
||||
| `internal/cid` | CID parsing + algorithm ranking for canonical-CID selection. |
|
||||
| `internal/discovery` | Service registry + dead-service cleaner. |
|
||||
| `internal/leader` | `LeaderInfoProvider` — builds the `/urls` payload from hostname/IP/config; no election logic. |
|
||||
| `internal/meshdisco` | meta-discovery v1 announcer + listener (the Go reference implementation). |
|
||||
| `internal/storage` | Redis wrapper (`client.go`), UUIDv7 minting, CID reverse index (`cid_resolution.go`), schema sentinel, field indexes + search-index bulk reads, UDL store (`udl.go`, `udl_admin.go`), stats, one-shot migrations/sweeps. |
|
||||
| `internal/cid` | CID parsing + rank ladder for canonical-CID selection (`cid-rank-vectors.json`, guarded by the meta-root `scripts/check-cid-vectors.sh`). |
|
||||
| `internal/identity` | Multi-account secp256k1 keystore, challenge/proof-of-possession, signature verification. |
|
||||
| `internal/events` | Keyspace-notification → `meta:events` stream publisher (`meta_publisher.go`). |
|
||||
| `internal/api` | HTTP server + all handlers + SSE event endpoints. |
|
||||
| `internal/api` | HTTP server + all handlers + SSE event endpoints + in-memory search index + `/api/stats`. |
|
||||
| `internal/schema` | Live per-field schema indexer (consumes `meta:events`). |
|
||||
| `internal/snapshot` | Snapshot export / import / wipe. |
|
||||
| `internal/watcher` | File system scanner, MidHash256 computation, dispatcher, state registry. |
|
||||
@@ -386,10 +438,12 @@ the repo-root [`METADATA_KEYS.md`](../../METADATA_KEYS.md).
|
||||
2. Build LeaderInfoProvider (no election — the bash gate already won)
|
||||
3. Connect to local Redis (retry up to 30× / 1s)
|
||||
4. EnsureSchemaVersion — abort if the existing Redis layout is stale
|
||||
5. Start service discovery + dead-service cleaner
|
||||
6. Construct API server (initialises watcher, mounts, WebDAV)
|
||||
7. Start API server; on first connect, start MetaPublisher + schema Indexer
|
||||
and republish existing metadata onto meta:events
|
||||
5. Start meta-discovery v1 node (unless ENABLE_UDP_DISCOVERY=false)
|
||||
6. Construct API server (identity keystore migration, watcher, watchers,
|
||||
mounts, WebDAV)
|
||||
7. Start API server + pollers + search-index refresh loop; start
|
||||
MetaPublisher + schema Indexer, then warm field indexes and republish
|
||||
existing metadata onto meta:events in the background
|
||||
8. Wait for SIGINT/SIGTERM, shutdown in reverse order
|
||||
```
|
||||
|
||||
@@ -400,11 +454,13 @@ the repo-root [`METADATA_KEYS.md`](../../METADATA_KEYS.md).
|
||||
| `github.com/gorilla/mux` | HTTP router |
|
||||
| `github.com/redis/go-redis/v9` | Redis client |
|
||||
| `github.com/google/uuid` | UUIDv7 minting |
|
||||
| `github.com/decred/dcrd/dcrec/secp256k1/v4`, `golang.org/x/crypto`, `github.com/mr-tron/base58` | Identity keys, signing, AEAD key derivation |
|
||||
| `golang.org/x/net` | WebDAV support |
|
||||
| Go stdlib | context, net/http, os, sync, syscall |
|
||||
| `github.com/alicebob/miniredis/v2` | In-memory Redis for tests |
|
||||
|
||||
Runtime requirements: Go 1.21+ at build time; the container ships Redis,
|
||||
rclone, nginx, and supervisord alongside the binary.
|
||||
rclone, nginx, and supervisord alongside the binary, plus the React dashboard
|
||||
and metadata editor (built from `dashboard/` and `editor/` in the Dockerfile).
|
||||
|
||||
## License
|
||||
|
||||
|
||||
Reference in New Issue
Block a user