Implement graceful deployments for Fly.io

[vishwamartur]

Related to #78

Implement graceful shutdown of old machines during Fly.io deployments to ensure livestreams are not interrupted.

• Pipeline Changes:

  • Modify lib/algora/pipeline.ex to list pipelines using Membrane.Pipeline.list_pipelines and check for running livestreams.
  • Add logic to destroy old machines if no livestreams are running in the :end_of_stream callback.

• Termination Logic:

  • Update lib/algora/terminate.ex to include a function terminate_interrupted_streams that lists pipelines and destroys old machines if no livestreams are running.

• Deployment Controller:

  • Add lib/algora_web/controllers/deployment_controller.ex to handle deployment-related actions such as starting/stopping livestreams, triggering deployments, confirming livestream continuity, and destroying old machines.

• Router Updates:

  • Modify lib/algora_web/router.ex to add routes for the new deployment-related actions in the DeploymentController.

• Tests:

  • Add test/algora_web/controllers/deployment_controller_test.exs to test the new deployment-related actions in the DeploymentController.

  /claim Graceful deployments #78

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[lastcanal]

Hi @vishwamartur. I think you might have missed the mark with this one. I see five HTTP routes but only one route is required: /health. You are also missing the AppHealth GenServer which serves as a backend for the /health route, which should be setup to control Fly's proxy.

This deployment script is the crux of the graceful deployment implementation and you are missing the RPC call to AppHealth.down and the associated fly.yaml config changes.

I am going to close this PR because it is far from implementing graceful deployments. Feel free to re-submit when you are closer to having more a complete solution and can test real graceful deployments on fly.

Thanks.