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Peter Steinberger 557ffdbe35 Discovery: wide-area bridge DNS-SD

# Conflicts:
#	apps/ios/Sources/Bridge/BridgeDiscoveryModel.swift
#	src/cli/dns-cli.ts

2025-12-17 20:31:02 +01:00

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summary, read_when

summary

read_when

How Clawdis presence entries are produced, merged, and displayed

Debugging the Instances tab

Investigating duplicate or stale instance rows

Changing gateway WS connect or system-event beacons

Presence

Clawdis “presence” is a lightweight, best-effort view of:

The Gateway itself (one per host), and
The clients connected to the Gateway (mac app, WebChat, CLI, etc.).

Presence is used primarily to render the mac app’s Instances tab and to provide quick operator visibility.

The data model

Presence entries are structured objects with (some) fields:

instanceId (optional but strongly recommended): stable client identity used for dedupe
host: a human-readable name (often the machine name)
ip: best-effort IP address (may be missing or stale)
version: client version string
deviceFamily (optional): hardware family like iPad, iPhone, Mac
modelIdentifier (optional): hardware model identifier like iPad16,6 or Mac16,6
mode: e.g. gateway, app, webchat, cli
lastInputSeconds (optional): “seconds since last user input” for that client machine
reason: a short marker like self, connect, periodic, instances-refresh
text: legacy/debug summary string (kept for backwards compatibility and UI display)
ts: last update timestamp (ms since epoch)

Producers (where presence comes from)

Presence entries are produced by multiple sources and then merged.

1) Gateway self entry

The Gateway seeds a “self” entry at startup so UIs always show at least the current gateway host.

Implementation: src/infra/system-presence.ts (initSelfPresence()).

2) WebSocket connect (connection-derived presence)

Every WS client must begin with a connect request. On successful handshake, the Gateway upserts a presence entry for that connection.

This is meant to answer: “Which clients are currently connected?”

Implementation: src/gateway/server.ts (connect handling uses connect.params.client.instanceId when provided; otherwise falls back to connId).

Why one-off CLI commands do not show up

The CLI connects to the Gateway to execute one-off commands (health/status/send/agent/etc.). These are not “nodes” and would spam the Instances list, so the Gateway does not create presence entries for clients with client.mode === "cli".

3) `system-event` beacons (client-reported presence)

Clients can publish richer periodic beacons via the system-event method. The mac app uses this to report:

a human-friendly host name
its best-known IP address
lastInputSeconds

Implementation:

Gateway: src/gateway/server.ts handles method system-event by calling updateSystemPresence(...).
mac app beaconing: apps/macos/Sources/Clawdis/PresenceReporter.swift.

Merge + dedupe rules (why `instanceId` matters)

All producers write into a single in-memory presence map.

Key points:

Entries are keyed by a “presence key”. If two producers use the same key, they update the same entry.
The best key is a stable, opaque instanceId that does not change across restarts.
Keys are treated case-insensitively.

Implementation: src/infra/system-presence.ts (normalizePresenceKey()).

mac app identity (stable UUID)

The mac app uses a persisted UUID as instanceId so:

restarts/reconnects do not create duplicates
renaming the Mac does not create a new “instance”
debug/release builds can share the same identity

Implementation: apps/macos/Sources/Clawdis/InstanceIdentity.swift.

displayName (machine name) is used for UI, while instanceId is used for dedupe.

TTL and bounded size (why stale rows disappear)

Presence entries are not permanent:

TTL: entries older than 5 minutes are pruned
Max: map is capped at 200 entries (LRU by ts)

Implementation: src/infra/system-presence.ts (TTL_MS, MAX_ENTRIES, pruning in listSystemPresence()).

Remote/tunnel caveat (loopback IPs)

When a client connects over an SSH tunnel / local port forward, the Gateway may see the remote address as loopback (127.0.0.1).

To avoid degrading an otherwise-correct client beacon IP, the Gateway avoids writing loopback remote addresses into presence entries.

Implementation: src/gateway/server.ts (isLoopbackAddress()).

Consumers (who reads presence)

macOS Instances tab

The mac app’s Instances tab renders the result of system-presence.