83 lines
4.3 KiB
Markdown
83 lines
4.3 KiB
Markdown
# World extensions
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The harness loads `/src/sausage` from its `main` branch.
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Each extension occupies `extensions/<name>/server.ts` in that repository.
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The default export is an extension or a factory that receives a `Host`.
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The extension name must match its folder.
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An optional numeric `order` export controls order. Names break ties.
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## Reload contract
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A change to the branch ref or `packed-refs` triggers a reload.
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The harness creates a detached world worktree at `/run/sausage/extensions/<sha>`.
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Imports read that snapshot through the world VFS, not the editable checkout.
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Relative imports must include their file extensions.
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TypeScript modules use the same `deno_ast` transpiler as the harness.
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The harness imports and validates the whole commit before it changes the live registry.
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An import error, factory error, name mismatch, or registry validation error retains the previous commit.
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A running tool call keeps its old implementation. The next call uses the new implementation.
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Removed extensions leave the registry after a successful reload.
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`/proc/extensions` contains JSON with `good`, `current`, and `error`.
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A session document persists these values in the harness database.
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On startup, the harness tries the tip, then the last good commit, before `resume()`.
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Tasks without a registered definition remain blocked.
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The snapshot worktrees disappear with `/run` on restart. The loader prunes stale worktree registrations before it recreates them.
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## Host
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The host supplies these members:
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- `harness()`, `storage.scanSubmissions`, `models()`, and the conversation `metadata` document token.
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- `settings()`, from `/src/sausage/settings.json`. The VFS watcher detects changes to this file.
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- `fs.read`, `write`, `append`, `list`, `stat`, `lstat`, `mkdir`, `remove`, and `rename` on world paths.
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- `exec(command, options)` for shell strings or argument arrays. Its result contains `code`, `stdout`, and `stderr`.
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- Exec options: `cwd`, `env` pairs, `timeout` in seconds, `conversations`, `signal`, and `onOutput(text, stream)`.
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- `git(cwd, ...args)`, which returns trimmed stdout and throws with stderr on failure.
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- `implement(api, value)`, which stages a service until the commit installs.
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- `need(api)`, which returns a proxy. Every method call resolves the current provider, including a retained method reference.
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- `want(api)`, which returns a proxy or `undefined` when no provider exists.
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- `onOpen(callback)` and `onClose(callback)` for facet lifecycle.
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- `resource(key, create)`, which retains a value across reloads. Keys belong to their extension name.
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- `notice(message)`, which writes a console line and the latest notice to `/proc/extensions`.
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P3-d will add `emit`, `react`, and `eventLog` at the marked seam in `host/js/extensions.ts`.
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Those APIs will supply transactional events and persistent reactor cursors.
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The synthetic package modules reuse the bundle's instances:
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- `@earendil-works/pi-durable` and `/tools`
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- `@earendil-works/pi-ai` and `/models`
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- `@earendil-works/pi-schema`
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- `@earendil-works/chord` and `/context`
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New package surfaces require a namespace in `registerModules()`.
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They must not bundle a second pi-durable instance.
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The registry supplies the default extension selection for existing conversations.
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New root conversations do not pin the built-ins.
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Explicit per-conversation extension selections remain explicit.
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## Revert
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Run this command inside the world:
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```sh
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extensions-revert
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```
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The Rust program lives in `userland/exec-tools/src/revert.rs`.
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It reads `/src/sausage/.git/sausage-last-good` and calls world git to update `refs/heads/main`.
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The loader writes this helper file after it persists the session status.
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An empty helper file means no commit succeeded yet.
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The command preserves the editable checkout. The branch change triggers the normal reload.
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## Tests
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`host/tests/extensions.rs` runs `host/js/extensions-test-bundle.js` with world git and a faux model.
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It tests A, broken B, changed C, an old call across reload, a retained service handle, and restart recovery.
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It also tests the revert command, file operations, and exec environment options.
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The world git and helper components use the executor's shared `CARGO_TARGET_DIR`.
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The API and hook fixtures use that directory too.
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The Nix shell overrides `CARGO_HOME`. Unset that variable before Cargo commands to preserve the configured kache wrapper.
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