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| 1 | +defmodule Algora.Github.Poller.Deliveries do |
| 2 | + @moduledoc false |
| 3 | + use GenServer |
| 4 | + |
| 5 | + import Ecto.Query, warn: false |
| 6 | + |
| 7 | + alias Algora.Github |
| 8 | + alias Algora.Repo |
| 9 | + alias Algora.Sync |
| 10 | + |
| 11 | + require Logger |
| 12 | + |
| 13 | + @per_page 100 |
| 14 | + @poll_interval :timer.seconds(10) |
| 15 | + |
| 16 | + # Client API |
| 17 | + def start_link(opts) do |
| 18 | + GenServer.start_link(__MODULE__, opts) |
| 19 | + end |
| 20 | + |
| 21 | + def pause(pid) do |
| 22 | + GenServer.cast(pid, :pause) |
| 23 | + end |
| 24 | + |
| 25 | + def resume(pid) do |
| 26 | + GenServer.cast(pid, :resume) |
| 27 | + end |
| 28 | + |
| 29 | + # Server callbacks |
| 30 | + @impl true |
| 31 | + def init(opts) do |
| 32 | + provider = Keyword.fetch!(opts, :provider) |
| 33 | + |
| 34 | + {:ok, |
| 35 | + %{ |
| 36 | + provider: provider, |
| 37 | + cursor: nil, |
| 38 | + paused: not Algora.config([:auto_start_pollers]) |
| 39 | + }, {:continue, :setup}} |
| 40 | + end |
| 41 | + |
| 42 | + @impl true |
| 43 | + def handle_continue(:setup, state) do |
| 44 | + {:ok, cursor} = get_or_create_cursor(state.provider, "deliveries") |
| 45 | + schedule_poll() |
| 46 | + |
| 47 | + {:noreply, %{state | cursor: cursor}} |
| 48 | + end |
| 49 | + |
| 50 | + @impl true |
| 51 | + def handle_info(:poll, %{paused: true} = state) do |
| 52 | + {:noreply, state} |
| 53 | + end |
| 54 | + |
| 55 | + @impl true |
| 56 | + def handle_info(:poll, state) do |
| 57 | + {:ok, new_state} = poll(state) |
| 58 | + schedule_poll() |
| 59 | + {:noreply, new_state} |
| 60 | + end |
| 61 | + |
| 62 | + @impl true |
| 63 | + def handle_cast(:pause, state) do |
| 64 | + {:noreply, %{state | paused: true}} |
| 65 | + end |
| 66 | + |
| 67 | + @impl true |
| 68 | + def handle_cast(:resume, %{paused: true} = state) do |
| 69 | + schedule_poll() |
| 70 | + {:noreply, %{state | paused: false}} |
| 71 | + end |
| 72 | + |
| 73 | + @impl true |
| 74 | + def handle_cast(:resume, state) do |
| 75 | + {:noreply, state} |
| 76 | + end |
| 77 | + |
| 78 | + @impl true |
| 79 | + def handle_call(:get_provider, _from, state) do |
| 80 | + {:reply, state.provider, state} |
| 81 | + end |
| 82 | + |
| 83 | + @impl true |
| 84 | + def handle_call(:is_paused, _from, state) do |
| 85 | + {:reply, state.paused, state} |
| 86 | + end |
| 87 | + |
| 88 | + defp schedule_poll do |
| 89 | + Process.send_after(self(), :poll, @poll_interval) |
| 90 | + end |
| 91 | + |
| 92 | + def poll(state) do |
| 93 | + with {:ok, deliveries} <- fetch_deliveries(state), |
| 94 | + if(length(deliveries) > 0, do: Logger.info("Processing #{length(deliveries)} deliveries")), |
| 95 | + {:ok, updated_cursor} <- process_batch(deliveries, state) do |
| 96 | + {:ok, %{state | cursor: updated_cursor}} |
| 97 | + else |
| 98 | + {:error, reason} -> |
| 99 | + Logger.error("Failed to fetch deliveries: #{inspect(reason)}") |
| 100 | + {:ok, state} |
| 101 | + end |
| 102 | + end |
| 103 | + |
| 104 | + defp process_batch([], state), do: {:ok, state.cursor} |
| 105 | + |
| 106 | + defp process_batch(deliveries, state) do |
| 107 | + Repo.transact(fn -> |
| 108 | + with :ok <- process_deliveries(deliveries, state) do |
| 109 | + update_last_polled(state.cursor, List.first(deliveries)) |
| 110 | + end |
| 111 | + end) |
| 112 | + end |
| 113 | + |
| 114 | + defp process_deliveries(deliveries, state) do |
| 115 | + Enum.reduce_while(deliveries, :ok, fn delivery, _acc -> |
| 116 | + case process_delivery(delivery, state) do |
| 117 | + {:ok, _} -> {:cont, :ok} |
| 118 | + error -> {:halt, error} |
| 119 | + end |
| 120 | + end) |
| 121 | + end |
| 122 | + |
| 123 | + defp fetch_deliveries(_state) do |
| 124 | + # TODO: paginate via the next and previous page cursors in the link header |
| 125 | + Github.list_deliveries(per_page: @per_page) |
| 126 | + end |
| 127 | + |
| 128 | + defp get_or_create_cursor(provider, resource) do |
| 129 | + case Sync.get_sync_cursor(provider, resource) do |
| 130 | + nil -> |
| 131 | + Sync.create_sync_cursor(%{provider: provider, resource: resource, timestamp: DateTime.utc_now()}) |
| 132 | + |
| 133 | + sync_cursor -> |
| 134 | + {:ok, sync_cursor} |
| 135 | + end |
| 136 | + end |
| 137 | + |
| 138 | + defp update_last_polled(sync_cursor, %{"delivered_at" => timestamp}) do |
| 139 | + with {:ok, timestamp, _} <- DateTime.from_iso8601(timestamp), |
| 140 | + {:ok, cursor} <- |
| 141 | + Sync.update_sync_cursor(sync_cursor, %{ |
| 142 | + timestamp: timestamp, |
| 143 | + last_polled_at: DateTime.utc_now() |
| 144 | + }) do |
| 145 | + {:ok, cursor} |
| 146 | + else |
| 147 | + {:error, reason} -> Logger.error("Failed to update sync cursor: #{inspect(reason)}") |
| 148 | + end |
| 149 | + end |
| 150 | + |
| 151 | + defp process_delivery(delivery, state) do |
| 152 | + case DateTime.from_iso8601(delivery["delivered_at"]) do |
| 153 | + {:ok, delivered_at, _} -> |
| 154 | + skip_reason = |
| 155 | + cond do |
| 156 | + not DateTime.after?(delivered_at, state.cursor.timestamp) -> :already_processed |
| 157 | + delivery["status_code"] < 400 -> :status_ok |
| 158 | + true -> nil |
| 159 | + end |
| 160 | + |
| 161 | + if skip_reason do |
| 162 | + {:ok, nil} |
| 163 | + else |
| 164 | + dbg("Enqueuing redelivery #{delivery["id"]}") |
| 165 | + |
| 166 | + %{delivery: delivery} |
| 167 | + |> Github.Poller.DeliveryConsumer.new() |
| 168 | + |> Oban.insert() |
| 169 | + end |
| 170 | + |
| 171 | + {:error, reason} -> |
| 172 | + Logger.error("Failed to parse delivery: #{inspect(delivery)}. Reason: #{inspect(reason)}") |
| 173 | + |
| 174 | + {:ok, nil} |
| 175 | + end |
| 176 | + end |
| 177 | +end |
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