feat(omnium): Add caplet vat implementation #753
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Implements Phase 1a of the caplet system, establishing the foundational architecture for caplet vats with a working echo-caplet example. This validates the caplet vat contract and installation lifecycle before tackling service injection complexity. Changes: - Add comprehensive caplet vat contract documentation - Create echo-caplet.js demonstrating buildRootObject pattern - Add bundle build script using @endo/bundle-source - Implement caplet integration tests (8 new tests, all passing) - Create test fixtures for caplet manifests - Refactor makeMockStorageAdapter to support shared storage - Add plan in .claude/plans for follow-up work Key achievements: - Caplet vat contract fully documented with examples - Echo-caplet bundles successfully (696KB) - Install/uninstall lifecycle tested and working - Service lookup by name validated - State persistence across controller restarts verified - 100% code coverage for CapletController maintained Deferred to future work (Phase 1b): - Kref capture mechanism - Service parameter injection - Consumer caplet implementation - Two-caplet communication Co-Authored-By: Claude Opus 4.5 <[email protected]>
Implements Phase 1b functionality to store caplet root kernel references (krefs) and expose them via omnium.caplet.getCapletRoot(). This enables: omnium.caplet.install(manifest), omnium.caplet.getCapletRoot(capletId), and E(presence).method() for calling vat methods from background console. Co-Authored-By: Claude Opus 4.5 <[email protected]>
Add explicit type annotation for kernelP and use spread operator for optional rootKref field. Co-Authored-By: Claude Opus 4.5 <[email protected]>
- Remove KrefWrapper type from kernel-browser-runtime types - Make rootKref a required string field in LaunchResult (not optional) - Make rootKref required in InstalledCaplet and omnium LaunchResult - Add assertions in kernel-facade for capData, subclusterId, and rootKref - Remove isKrefWrapper function (inline check kept in makeKrefTables) - Update tests to use simplified types and improved mocks Co-Authored-By: Claude Opus 4.5 <[email protected]>
Add tests for validation errors in kernel-facade launchSubcluster: - Throws when kernel returns no capData - Throws when capData body has no subclusterId - Throws when capData slots is empty (no root kref) Co-Authored-By: Claude Opus 4.5 <[email protected]>
Add omnium.manifests.echo so users can install caplets from the console: await omnium.caplet.install(omnium.manifests.echo) Changes: - Create src/manifests.ts with echo caplet manifest using chrome.runtime.getURL - Add echo-caplet.bundle to vite static copy targets - Expose manifests in background.ts via omnium.manifests - Update global.d.ts with manifests type and missing getCapletRoot Co-Authored-By: Claude Opus 4.5 <[email protected]>
- Add omnium.loadCaplet(id) to dynamically fetch caplet manifest and bundle - Fix vatPowers.logger missing in browser vats (iframe.ts) - Fix SubclusterLaunchResult to return bootstrapRootKref directly instead of trying to extract it from bootstrap() return slots The bootstrapRootKref is the kref of the vat root object, which is already known when the vat launches. Previously we incorrectly tried to get it from the slots of the bootstrap() method return value. Next step: Wire up CapTP marshalling so E(root).echo() works with the caplet root presence. Co-Authored-By: Claude Opus 4.5 <[email protected]>
Use nullable() instead of optional() for bootstrapResult field, and define a JSON-compatible LaunchSubclusterRpcResult type that uses null instead of undefined for JSON serialization. Also update tests to match the new behavior. Co-Authored-By: Claude Opus 4.5 <[email protected]>
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Summary
Test plan
Part 3 of 4 in PR stack for omnium-III
Depends on: #752
🤖 Generated with Claude Code
Note
Introduces initial caplet implementation and wires kernel launch results through to consumers.
launchSubclusternow returnsSubclusterLaunchResultwithsubclusterId,bootstrapRootKref, and optionalbootstrapResult; facade maps to{ subclusterId, rootKref }. RPC spec/tests updated.getVatRoot(krefString); kref marshalling scaffolding added (disabled) with tests.docs/caplet-contract.md, anecho-capletvat (src/vats/echo-caplet.js) and manifest; build copies.bundle/manifests and addsbuild:vats. Background exposesomnium.loadCaplet()andcaplet.getCapletRoot();CapletControllernow storesrootKreffrom install and can return the root presence. New integration tests and fixtures.vatPowers.loggertoVatSupervisor.Written by Cursor Bugbot for commit 451a6dd. This will update automatically on new commits. Configure here.