CLI utility to launch an n8n task runner in external mode. The launcher's purpose is to minimize resource use by launching a runner on demand, i.e. only when no runner is available and when a task is ready for pickup. It also makes sure the runner stays responsive and recovers from crashes.
Built with Bazel for reproducible, hermetic builds across all environments.
./task-runner-launcher javascript
2024/11/29 13:37:46 INFO [launcher:js] Starting launcher goroutine...
2024/11/29 13:37:46 DEBUG [launcher:js] Changed into working directory
2024/11/29 13:37:46 DEBUG [launcher:js] Prepared env vars for runner
2024/11/29 13:37:46 INFO [launcher:js] Waiting for task broker to be ready...
2024/11/29 13:37:46 DEBUG [launcher:js] Task broker is ready
2024/11/29 13:37:46 DEBUG [launcher:js] Fetched grant token for launcher
2024/11/29 13:37:46 DEBUG [launcher:js] Launcher ID: fc6c24b9f764ae55
2024/11/29 13:37:46 DEBUG [launcher:js] Connected: ws://127.0.0.1:5679/runners/_ws?id=fc6c24b9f764ae55
2024/11/29 13:37:46 DEBUG [launcher:js] <- Received message `broker:inforequest`
2024/11/29 13:37:46 DEBUG [launcher:js] -> Sent message `runner:info`
2024/11/29 13:37:46 DEBUG [launcher:js] <- Received message `broker:runnerregistered`
2024/11/29 13:37:46 DEBUG [launcher:js] -> Sent message `runner:taskoffer` for offer ID `5990b980a04945bd`
2024/11/29 13:37:46 INFO [launcher:js] Waiting for launcher's task offer to be accepted...
brew install bazelisk
# Build
bazel build //cmd/launcher:task-runner-launcher
# Run
bazel run //cmd/launcher:task-runner-launcher -- javascript
# Test with coverage
bazel test //...
bazel run //:coverage # 91.3% coverage- Setup - how to set up the launcher in a production environment
- Development - how to set up a development environment to work on the launcher
- Release - how to release a new version of the launcher
- Lifecycle - how the launcher works