Function startExecutionEngine

packages/cli/src/commands/run.ts:979–1007

(engine: ExecutionEngine, isMachineOutput: boolean)

}

async function startExecutionEngine(engine: ExecutionEngine, isMachineOutput: boolean): Promise<void> {
  if (!isMachineOutput) {
    log(getChalk().dim('Starting deepnote-toolkit server...'))
  }

  try {
    await engine.start()
  } catch (error) {
    const message = error instanceof Error ? error.message : String(error)

    // Attempt to clean up any partially-initialized resource
    try {
      await engine.stop()
    } catch (stopError) {
      const stopMessage = stopError instanceof Error ? stopError.message : String(stopError)
      if (!isMachineOutput) {
        logError(getChalk().dim(`Note: cleanup also failed: ${stopMessage}`))
      }
    }

    throw new Error(
      `Failed to start server: ${message}\n\nMake sure deepnote-toolkit is installed:\n  pip install deepnote-toolkit[server]`
    )
  }

  if (!isMachineOutput) {
    log(getChalk().dim('Server ready. Executing blocks...\n'))
  }
}

async function startMetricsMonitoring(
  engine: ExecutionEngine,