Check left blocks in pending block operations in order to decide, if we need to display indexing int tx banner at the top
Viktor Baranov
2 years ago
parent
69b94e4fa3
commit
56b0b220d0
@ -1,3 +1,3 @@ |
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elixir 1.14.4-otp-25 |
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elixir 1.14.5-otp-25 |
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erlang 25.3 |
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nodejs 18.13.0 |
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|
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@ -0,0 +1,73 @@ |
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defmodule Explorer.Chain.Cache.PendingBlockOperation do |
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@moduledoc """ |
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Cache for estimated `pending_block_operations` count. |
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""" |
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|
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use Explorer.Chain.MapCache, |
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name: :pending_block_operations_count, |
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key: :count, |
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key: :async_task, |
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global_ttl: Application.get_env(:explorer, __MODULE__)[:global_ttl], |
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ttl_check_interval: :timer.seconds(1), |
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callback: &async_task_on_deletion(&1) |
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|
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require Logger |
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|
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alias Explorer.Chain.Cache.Helper |
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alias Explorer.Chain.PendingBlockOperation |
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alias Explorer.Repo |
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@doc """ |
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Estimated count of `t:Explorer.Chain.PendingBlockOperation.t/0`. |
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""" |
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@spec estimated_count() :: non_neg_integer() |
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def estimated_count do |
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cached_value = __MODULE__.get_count() |
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if is_nil(cached_value) do |
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count = Helper.estimated_count_from("pending_block_operations") |
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max(count, 0) |
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else |
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cached_value |
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end |
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end |
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|
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defp handle_fallback(:count) do |
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# This will get the task PID if one exists and launch a new task if not |
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# See next `handle_fallback` definition |
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get_async_task() |
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{:return, nil} |
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end |
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defp handle_fallback(:async_task) do |
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# If this gets called it means an async task was requested, but none exists |
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# so a new one needs to be launched |
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{:ok, task} = |
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Task.start(fn -> |
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try do |
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result = Repo.aggregate(PendingBlockOperation, :count, timeout: :infinity) |
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set_count(result) |
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rescue |
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e -> |
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Logger.debug([ |
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"Couldn't update pending_block_operations count: ", |
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Exception.format(:error, e, __STACKTRACE__) |
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]) |
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end |
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set_async_task(nil) |
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end) |
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{:update, task} |
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end |
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# By setting this as a `callback` an async task will be started each time the |
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# `count` expires (unless there is one already running) |
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defp async_task_on_deletion({:delete, _, :count}), do: get_async_task() |
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|
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defp async_task_on_deletion(_data), do: nil |
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end |
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