$ show openclaw/crabline
Crabline is a deterministic local messaging-channel mocking framework for end-to-end testing of chat integrations. It provides a CLI tool and a TypeScript library that simulates 12+ messaging platforms (Discord, Slack, Telegram, WhatsApp, Matrix, etc.) via mock servers and provider adapters. The architecture is built around a provider adapter pattern with lazy loading, a JSONL-based event recorder with cross-process locking, and a fixture-driven test runner that supports probe, send, roundtrip, and agent modes. The system is configuration-driven via YAML manifests validated with Zod schemas, and it publishes readiness artifacts for integration with the OpenClaw QA ecosystem. The codebase demonstrates strong engineering practices: clean separation of concerns, extensive test coverage (including concurrency and edge cases), and reusable infrastructure components such as process-owned file locks, nonce generation, inbound message matchers, and webhook authentication policies. The mock servers faithfully replicate platform-specific APIs (REST, WebSocket, SSE) with configurable resource limits and admin inbound endpoints for injecting test messages. While primarily a testing tool, Crabline's components are designed for reuse: the recorder, lock system, and provider adapter base class can be extracted into other projects. The repository is actively maintained with CI/CD pipelines, dependency management, and a changelog. It is not a data research project; all data artifacts (JSONL logs) are operational evidence for test assertions, not analytical datasets.
The LLM identified 5 files worth highlighting for reuse:
Provides a cross-platform (Linux, macOS, Windows) file-system lock with process identity verification, recovery claims, and abandoned owner detection. Wraps fs.mkdir/stat/rmdir to enforce ownership via boot IDs, process stats, and machine GUIDs. Standalone and reusable for any coordination problem requiring process-granularity locks.
Implements deterministic nonce generation and extraction with canonical boundary rules. Used for matching inbound messages to fixture expectations. The pattern is self-contained and could be reused in any system requiring unique, predictable identifiers with clear delimiters.
Core event recorder that appends structured JSONL records to files with cross-process locking (proper-lockfile), identity-based lock namespaces, tail recovery for incomplete records, and cursor-based waiting. Reusable for any application needing durable, append-only event storage with concurrent writer safety.
Base class for local mock provider adapters. Provides shared webhook server setup, recorder integration, and default implementations for probe, send, waitForInbound, and watch. Can be extended to create mock providers for any chat platform with minimal code, making it a reusable pattern for testing infrastructure.
Lazy dynamic-import registry that maps provider IDs to adapter constructors. Creates adapters on demand with (providerId, config, userName) and handles cleanup. The pattern avoids loading all adapters eagerly and provides a clean abstraction for provider resolution, reusable in any multi-provider system.