850cf2db73
* Added jobs for enqueuing/dequeuing media based on source's status * adds lifecycle columns to source and media_item tables
63 lines
2.2 KiB
Elixir
63 lines
2.2 KiB
Elixir
defmodule Pinchflat.Workers.MediaIndexingWorker do
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@moduledoc false
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use Oban.Worker,
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queue: :media_indexing,
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unique: [period: :infinity, states: [:available, :scheduled, :retryable]],
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tags: ["media_source", "media_indexing"]
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alias __MODULE__
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alias Pinchflat.Tasks
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alias Pinchflat.MediaSource
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alias Pinchflat.Tasks.SourceTasks
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@impl Oban.Worker
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@doc """
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The ID is that of a source _record_, not a YouTube channel/playlist ID. Indexes
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the provided source, kicks off downloads for each new MediaItem, and
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reschedules the job to run again in the future (as determined by the
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souce's `index_frequency_minutes` field).
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README: Re-scheduling here works a little different than you may expect.
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The reschedule time is relative to the time the job has actually _completed_.
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This has some benefits but also side effects to be aware of:
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- Benefit: No chance for jobs to overlap if a job takes longer than the
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scheduled interval. Less likely to hit API rate limits.
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- Side effect: Intervals are "soft" and _always_ walk forward. This may cause
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user confusion since a 30-minute job scheduled for every hour will
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actually run every 1 hour and 30 minutes. The tradeoff of not inundating
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the API with requests and also not overlapping jobs is worth it, IMO.
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NOTE: Since indexing can take a LONG time, I should check what happens if an
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application restart occurs while a job is running. Will the job be lost?
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IDEA: Should I use paging and do indexing in chunks? Is that even faster?
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Returns :ok | {:ok, %Task{}}
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"""
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def perform(%Oban.Job{args: %{"id" => source_id}}) do
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source = MediaSource.get_source!(source_id)
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if source.index_frequency_minutes <= 0 do
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:ok
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else
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index_media_and_reschedule(source)
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end
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end
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defp index_media_and_reschedule(source) do
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SourceTasks.index_media_items(source)
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# This method handles the case where a source is set to not download media
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SourceTasks.enqueue_pending_media_tasks(source)
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source
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|> Map.take([:id])
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|> MediaIndexingWorker.new(schedule_in: source.index_frequency_minutes * 60)
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|> Tasks.create_job_with_task(source)
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|> case do
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{:ok, task} -> {:ok, task}
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{:error, :duplicate_job} -> {:ok, :job_exists}
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end
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end
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end
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