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diff --git a/LICENSE.txt b/LICENSE.txt
new file mode 100644
index 0000000..815675d
--- /dev/null
+++ b/LICENSE.txt
@@ -0,0 +1,201 @@
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diff --git a/lib/oban/plugins/lazarus.ex b/lib/oban/plugins/lazarus.ex
index 6fa8bca..94a3997 100644
--- a/lib/oban/plugins/lazarus.ex
+++ b/lib/oban/plugins/lazarus.ex
@@ -1,18 +1,176 @@
-defmodule Oban.Plugins.Lazarus do
+defmodule Oban.Plugins.Lifeline do
@moduledoc """
- Documentation for `Oban.Plugins.Lazarus`.
- """
+ Naively transition jobs stuck `executing` back to `available`.
+
+ The `Lifeline` plugin periodically rescues orphaned jobs, i.e. jobs that are stuck in the
+ `executing` state because the node was shut down before the job could finish. Rescuing is
+ purely based on time, rather than any heuristic about the job's expected execution time or
+ whether the node is still alive.
+
+ If an executing job has exhausted all attempts, the Lifeline plugin will mark it `discarded`
+ rather than `available`.
+
+ > #### 🌟 DynamicLifeline {: .info}
+ >
+ > This plugin may transition jobs that are genuinely `executing` and cause duplicate execution.
+ > For more accurate rescuing or to rescue jobs that have exhausted retry attempts see the
+ > `DynamicLifeline` plugin in [Oban Pro](https://getoban.pro/docs/pro/Oban.Pro.Plugins.DynamicLifeline.html).
+
+ ## Using the Plugin
+
+ Rescue orphaned jobs that are still `executing` after the default of 60 minutes:
+
+ config :my_app, Oban,
+ plugins: [Oban.Plugins.Lifeline],
+ ...
+
+ Override the default period to rescue orphans after a more aggressive period of 5 minutes:
+
+ config :my_app, Oban,
+ plugins: [{Oban.Plugins.Lifeline, rescue_after: :timer.minutes(5)}],
+ ...
+
+ ## Options
+
+ * `:interval` — the number of milliseconds between rescue attempts. The default is `60_000ms`.
+
+ * `:rescue_after` — the maximum amount of time, in milliseconds, that a job may execute before
+ being rescued. 60 minutes by default, and rescuing is performed once a minute.
+
+ ## Instrumenting with Telemetry
- @doc """
- Hello world.
+ The `Oban.Plugins.Lifeline` plugin adds the following metadata to the `[:oban, :plugin, :stop]`
+ event:
- ## Examples
+ * `:rescued_jobs` — a list of jobs transitioned back to `available`
- iex> Oban.Plugins.Lazarus.hello()
- :world
+ * `:discarded_jobs` — a list of jobs transitioned to `discarded`
+ _Note: jobs only include `id`, `queue`, `state` fields._
"""
- def hello do
- :world
+
+ @behaviour Oban.Plugin
+
+ use GenServer
+
+ import Ecto.Query, only: [select: 3, where: 3]
+
+ alias Oban.{Job, Peer, Plugin, Repo, Validation}
+ alias __MODULE__, as: State
+
+ @type option ::
+ Plugin.option()
+ | {:interval, timeout()}
+ | {:rescue_after, pos_integer()}
+
+ defstruct [
+ :conf,
+ :timer,
+ interval: :timer.minutes(1),
+ rescue_after: :timer.minutes(60)
+ ]
+
+ @doc false
+ @spec child_spec(Keyword.t()) :: Supervisor.child_spec()
+ def child_spec(opts), do: super(opts)
+
+ @impl Plugin
+ @spec start_link([option()]) :: GenServer.on_start()
+ def start_link(opts) do
+ {name, opts} = Keyword.pop(opts, :name)
+
+ GenServer.start_link(__MODULE__, struct!(State, opts), name: name)
+ end
+
+ @impl Plugin
+ def validate(opts) do
+ Validation.validate_schema(opts,
+ conf: :any,
+ name: :any,
+ interval: :pos_integer,
+ rescue_after: :pos_integer
+ )
+ end
+
+ @impl GenServer
+ def init(state) do
+ :telemetry.execute([:oban, :plugin, :init], %{}, %{conf: state.conf, plugin: __MODULE__})
+
+ {:ok, schedule_rescue(state)}
+ end
+
+ @impl GenServer
+ def terminate(_reason, %State{timer: timer}) do
+ if is_reference(timer), do: Process.cancel_timer(timer)
+
+ :ok
+ end
+
+ @impl GenServer
+ def handle_info(:rescue, %State{} = state) do
+ meta = %{conf: state.conf, plugin: __MODULE__}
+
+ :telemetry.span([:oban, :plugin], meta, fn ->
+ case check_leadership_and_rescue_jobs(state) do
+ {:ok, extra} when is_map(extra) ->
+ {:ok, Map.merge(meta, extra)}
+
+ error ->
+ {:error, Map.put(meta, :error, error)}
+ end
+ end)
+
+ {:noreply, schedule_rescue(state)}
+ end
+
+ # Scheduling
+
+ defp schedule_rescue(state) do
+ timer = Process.send_after(self(), :rescue, state.interval)
+
+ %{state | timer: timer}
+ end
+
+ # Rescuing
+
+ defp check_leadership_and_rescue_jobs(state) do
+ if Peer.leader?(state.conf) do
+ Repo.transaction(state.conf, fn ->
+ time = DateTime.add(DateTime.utc_now(), -state.rescue_after, :millisecond)
+ base = where(Job, [j], j.state == "executing" and j.attempted_at < ^time)
+
+ {rescued_count, rescued} = transition_available(base, state)
+ {discard_count, discard} = transition_discarded(base, state)
+
+ %{
+ discarded_count: discard_count,
+ discarded_jobs: discard,
+ rescued_count: rescued_count,
+ rescued_jobs: rescued
+ }
+ end)
+ else
+ {:ok, %{}}
+ end
+ end
+
+ defp transition_available(base, state) do
+ query =
+ base
+ |> where([j], j.attempt < j.max_attempts)
+ |> select([j], map(j, [:id, :queue, :state]))
+
+ Repo.update_all(state.conf, query, set: [state: "available"])
+ end
+
+ defp transition_discarded(base, state) do
+ query =
+ base
+ |> where([j], j.attempt >= j.max_attempts)
+ |> select([j], map(j, [:id, :queue, :state]))
+
+ Repo.update_all(state.conf, query,
+ set: [state: "discarded", discarded_at: DateTime.utc_now()]
+ )
end
end

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