dsh-projection-guard

dsh-projection-guard

中文

A DeepSeek Harness (DSH) plugin that guards the persisted session-projection cache against misbehaving projection units — so session titles (and every other projection) survive restarts no matter what third-party plugins do.

The bug it fixes

DSH persists per-session projection checkpoints (session titles, stats, permissions, …) into session_projcache.json. The write path serializes the whole per-session checkpoint in one JSON pass: if a *single* projection unit stores a non-JSON value (a Map, Set, class instance, cyclic or non-finite value — e.g. some third-party plugins), the entire write fails. The failure is fail-soft (log-only), so the cache silently stops updating. After a restart, every cold session loses its title projection and the UI falls back to showing the workspace folder name instead of the conversation title.

What this plugin does

1. Per-row degradation (runtime wrapper). It wraps sessionProjectionCache.put() and drops only the rows that are not lossless JSON, keeping every healthy row durable. One bad unit can no longer stall the whole cache — titles, sessionListMetadata, stats etc. keep writing normally.

1. Startup self-heal. On startup it scans persisted sessions whose cached title is missing and cold-reads their logs to backfill the title projection, so an already-stale cache recovers automatically.

1. Observability. A read-only GET /projection-guard/status route reports wrapped-put call counts, dropped rows, and repaired titles (also shown as a small card in Settings when the client half is mounted).

No official or third-party files are modified — the guard is a pure runtime wrapper, so it survives dsh upgrades and works on any deployment.

Install

dsh plugin --profile web add github:DamonKoy/dsh-projection-guard

Restart dsh web. That's it.

Or add the repo as a profile dependency and include the bundle:

{
  "dependencies": {
    "dsh-projection-guard": "github:DamonKoy/dsh-projection-guard"
  },
  "dsh": {
    "profile": {
      "bundles": ["dsh-projection-guard"]
    }
  }
}

Then pnpm install in the profile directory and restart dsh web.

Configuration

Example (profile cordis.patch.yml overlay):

- id: projection-guard
  config:
    repairOnStart: true
    logDropped: true

Development

npm test          # unit tests for the guard core

License

MIT