Enable session resumability across Cloud Run restarts:
- executor.ts: Save conversation history in task metadata during
toSDKTask(), restore via setHistory() in reconstruct()
- gcs.ts: Persist conversation history as separate GCS object
(conversation.tar.gz) alongside metadata and workspace
- session-store.ts: Add optional GCS-backed persistence with periodic
flush and restore-on-startup for thread→session mappings
- handler.ts: Restore persisted sessions on initialize()
- types.ts: Add gcsBucket to ChatBridgeConfig
- app.ts: Pass GCS_BUCKET_NAME to chat bridge config
Validated end-to-end: message persists, Cloud Run restarts, follow-up
message in same thread correctly recalls prior context. Different
threads maintain isolation.
Verifies Bearer tokens from Google Chat using google-auth-library.
Checks issuer (chat@system.gserviceaccount.com) and audience
(CHAT_PROJECT_NUMBER). Verification is skipped when project number
is not configured, allowing local testing without tokens.
Implements a Google Chat HTTP webhook bridge that connects Google Chat
to the A2A server. Each Chat thread maps to an A2A contextId/taskId
pair. The bridge converts A2UI tool approval surfaces to Google Chat
Cards V2 with Approve/Always Allow/Reject buttons, and handles
CARD_CLICKED events to forward tool confirmations back to the A2A server.
Components:
- chat-bridge/types.ts: Google Chat event/response types
- chat-bridge/session-store.ts: Thread -> A2A session mapping
- chat-bridge/a2a-bridge-client.ts: A2A SDK client wrapper
- chat-bridge/response-renderer.ts: A2UI -> Google Chat Cards V2
- chat-bridge/handler.ts: Event handler (MESSAGE, CARD_CLICKED)
- chat-bridge/routes.ts: Express routes mounted at /chat/webhook
Adam Weidman