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@ -17,27 +17,61 @@ defmodule Explorer.Chain.Cache.GasPriceOracle do |
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Wei |
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} |
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alias Explorer.Repo |
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alias Explorer.Counters.AverageBlockTime |
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alias Explorer.{Market, Repo} |
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alias Timex.Duration |
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use Explorer.Chain.MapCache, |
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name: :gas_price, |
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key: :gas_prices, |
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key: :gas_prices_acc, |
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key: :updated_at, |
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key: :old_gas_prices, |
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key: :async_task, |
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global_ttl: Application.get_env(:explorer, __MODULE__)[:global_ttl], |
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global_ttl: 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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@doc """ |
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Get `safelow`, `average` and `fast` percentile of transactions gas prices among the last `num_of_blocks` blocks |
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Calculates the `slow`, `average`, and `fast` gas price and time percentiles from the last `num_of_blocks` blocks and estimates the fiat price for each percentile. |
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These percentiles correspond to the likelihood of a transaction being picked up by miners depending on the fee offered. |
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""" |
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@spec get_average_gas_price(pos_integer(), pos_integer(), pos_integer(), pos_integer()) :: |
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{:error, any} | {:ok, %{String.t() => nil | float, String.t() => nil | float, String.t() => nil | float}} |
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{{:error, any} | {:ok, %{slow: gas_price, average: gas_price, fast: gas_price}}, |
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[ |
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%{ |
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block_number: non_neg_integer(), |
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slow_gas_price: nil | Decimal.t(), |
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fast_gas_price: nil | Decimal.t(), |
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average_gas_price: nil | Decimal.t(), |
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slow_priority_fee_per_gas: nil | Decimal.t(), |
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average_priority_fee_per_gas: nil | Decimal.t(), |
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fast_priority_fee_per_gas: nil | Decimal.t(), |
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slow_time: nil | Decimal.t(), |
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average_time: nil | Decimal.t(), |
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fast_time: nil | Decimal.t() |
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} |
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]} |
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when gas_price: nil | %{price: float(), time: float(), fiat_price: Decimal.t()} |
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def get_average_gas_price(num_of_blocks, safelow_percentile, average_percentile, fast_percentile) do |
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safelow_percentile_fraction = safelow_percentile / 100 |
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average_percentile_fraction = average_percentile / 100 |
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fast_percentile_fraction = fast_percentile / 100 |
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acc = get_gas_prices_acc() |
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from_block = |
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case acc do |
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[%{block_number: from_block} | _] -> from_block |
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_ -> -1 |
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end |
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average_block_time = |
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case AverageBlockTime.average_block_time() do |
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{:error, _} -> nil |
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average_block_time -> average_block_time |> Duration.to_milliseconds() |
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end |
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fee_query = |
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from( |
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block in Block, |
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@ -45,120 +79,186 @@ defmodule Explorer.Chain.Cache.GasPriceOracle do |
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where: block.consensus == true, |
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where: transaction.status == ^1, |
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where: transaction.gas_price > ^0, |
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group_by: block.number, |
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order_by: [desc: block.number], |
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where: transaction.block_number > ^from_block, |
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group_by: transaction.block_number, |
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order_by: [desc: transaction.block_number], |
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select: %{ |
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block_number: transaction.block_number, |
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slow_gas_price: |
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fragment( |
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"percentile_disc(?) within group ( order by ? )", |
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"percentile_disc(? :: real) within group ( order by ? )", |
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^safelow_percentile_fraction, |
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transaction.gas_price |
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), |
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average_gas_price: |
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fragment( |
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"percentile_disc(?) within group ( order by ? )", |
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"percentile_disc(? :: real) within group ( order by ? )", |
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^average_percentile_fraction, |
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transaction.gas_price |
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), |
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fast_gas_price: |
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fragment( |
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"percentile_disc(?) within group ( order by ? )", |
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"percentile_disc(? :: real) within group ( order by ? )", |
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^fast_percentile_fraction, |
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transaction.gas_price |
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), |
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slow: |
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slow_priority_fee_per_gas: |
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fragment( |
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"percentile_disc(?) within group ( order by ? )", |
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"percentile_disc(? :: real) within group ( order by ? )", |
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^safelow_percentile_fraction, |
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transaction.max_priority_fee_per_gas |
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), |
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average: |
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average_priority_fee_per_gas: |
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fragment( |
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"percentile_disc(?) within group ( order by ? )", |
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"percentile_disc(? :: real) within group ( order by ? )", |
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^average_percentile_fraction, |
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transaction.max_priority_fee_per_gas |
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), |
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fast: |
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fast_priority_fee_per_gas: |
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fragment( |
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"percentile_disc(?) within group ( order by ? )", |
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"percentile_disc(? :: real) within group ( order by ? )", |
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^fast_percentile_fraction, |
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transaction.max_priority_fee_per_gas |
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), |
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slow_time: |
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fragment( |
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"percentile_disc(? :: real) within group ( order by coalesce(extract(milliseconds from (?)::interval), ?) desc )", |
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^safelow_percentile_fraction, |
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block.timestamp - transaction.earliest_processing_start, |
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^average_block_time |
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), |
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average_time: |
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fragment( |
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"percentile_disc(? :: real) within group ( order by coalesce(extract(milliseconds from (?)::interval), ?) desc )", |
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^average_percentile_fraction, |
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block.timestamp - transaction.earliest_processing_start, |
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^average_block_time |
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), |
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fast_time: |
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fragment( |
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"percentile_disc(? :: real) within group ( order by coalesce(extract(milliseconds from (?)::interval), ?) desc )", |
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^fast_percentile_fraction, |
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block.timestamp - transaction.earliest_processing_start, |
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^average_block_time |
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) |
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}, |
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limit: ^num_of_blocks |
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) |
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gas_prices = fee_query |> Repo.all(timeout: :infinity) |> process_fee_data_from_db() |
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new_acc = fee_query |> Repo.all(timeout: :infinity) |> merge_gas_prices(acc, num_of_blocks) |
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gas_prices = new_acc |> process_fee_data_from_db() |
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{:ok, gas_prices} |
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{{:ok, gas_prices}, new_acc} |
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catch |
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error -> |
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{:error, error} |
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Logger.error("Failed to get gas prices: #{inspect(error)}") |
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{{:error, error}, get_gas_prices_acc()} |
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end |
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defp merge_gas_prices(new, acc, acc_size), do: Enum.take(new ++ acc, acc_size) |
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defp process_fee_data_from_db([]) do |
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%{ |
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"slow" => nil, |
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"average" => nil, |
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"fast" => nil |
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slow: nil, |
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average: nil, |
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fast: nil |
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} |
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end |
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defp process_fee_data_from_db(fees) do |
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fees_length = Enum.count(fees) |
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%{ |
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slow_gas_price: slow_gas_price, |
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average_gas_price: average_gas_price, |
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fast_gas_price: fast_gas_price, |
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slow: slow, |
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average: average, |
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fast: fast |
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} = |
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fees |
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|> Enum.reduce( |
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&Map.merge(&1, &2, fn |
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_, v1, v2 when nil not in [v1, v2] -> Decimal.add(v1, v2) |
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_, v1, v2 -> v1 || v2 |
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end) |
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) |
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|> Map.new(fn |
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{key, nil} -> {key, nil} |
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{key, value} -> {key, Decimal.div(value, fees_length)} |
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end) |
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slow_priority_fee_per_gas: slow_priority_fee_per_gas, |
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average_priority_fee_per_gas: average_priority_fee_per_gas, |
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fast_priority_fee_per_gas: fast_priority_fee_per_gas, |
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slow_time: slow_time, |
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average_time: average_time, |
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fast_time: fast_time |
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} = merge_fees(fees) |
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json_rpc_named_arguments = Application.get_env(:explorer, :json_rpc_named_arguments) |
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{slow_fee, average_fee, fast_fee} = |
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case {nil not in [slow, average, fast], EthereumJSONRPC.fetch_block_by_tag("pending", json_rpc_named_arguments)} do |
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{true, {:ok, %Blocks{blocks_params: [%{base_fee_per_gas: base_fee}]}}} when not is_nil(base_fee) -> |
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case nil not in [slow_priority_fee_per_gas, average_priority_fee_per_gas, fast_priority_fee_per_gas] && |
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EthereumJSONRPC.fetch_block_by_tag("pending", json_rpc_named_arguments) do |
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{:ok, %Blocks{blocks_params: [%{base_fee_per_gas: base_fee}]}} when not is_nil(base_fee) -> |
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base_fee_wei = base_fee |> Decimal.new() |> Wei.from(:wei) |
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{ |
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priority_with_base_fee(slow, base_fee_wei), |
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priority_with_base_fee(average, base_fee_wei), |
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priority_with_base_fee(fast, base_fee_wei) |
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priority_with_base_fee(slow_priority_fee_per_gas, base_fee_wei), |
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priority_with_base_fee(average_priority_fee_per_gas, base_fee_wei), |
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priority_with_base_fee(fast_priority_fee_per_gas, base_fee_wei) |
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} |
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_ -> |
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{gas_price(slow_gas_price), gas_price(average_gas_price), gas_price(fast_gas_price)} |
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end |
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exchange_rate_from_db = Market.get_coin_exchange_rate() |
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%{ |
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"slow" => slow_fee, |
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"average" => average_fee, |
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"fast" => fast_fee |
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slow: compose_gas_price(slow_fee, slow_time, exchange_rate_from_db), |
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average: compose_gas_price(average_fee, average_time, exchange_rate_from_db), |
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fast: compose_gas_price(fast_fee, fast_time, exchange_rate_from_db) |
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} |
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end |
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defp merge_fees(fees_from_db) do |
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fees_from_db |
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|> Stream.map(&Map.delete(&1, :block_number)) |
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|> Enum.reduce( |
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&Map.merge(&1, &2, fn |
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_, nil, nil -> nil |
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_, val, acc when nil not in [val, acc] and is_list(acc) -> [val | acc] |
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_, val, acc when nil not in [val, acc] -> [val, acc] |
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_, val, acc -> [val || acc] |
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end) |
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) |
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|> Map.new(fn |
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{key, nil} -> |
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{key, nil} |
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{key, value} -> |
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value = if is_list(value), do: value, else: [value] |
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count = Enum.count(value) |
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{key, value |> Enum.reduce(Decimal.new(0), &Decimal.add/2) |> Decimal.div(count)} |
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end) |
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end |
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defp compose_gas_price(fee, time, exchange_rate_from_db) do |
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%{ |
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price: fee |> format_wei(), |
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time: time && time |> Decimal.to_float(), |
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fiat_price: fiat_fee(fee, exchange_rate_from_db) |
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} |
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end |
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defp fiat_fee(fee, exchange_rate) do |
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exchange_rate.usd_value && |
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fee |
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|> Wei.to(:ether) |
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|> Decimal.mult(exchange_rate.usd_value) |
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|> Decimal.mult(simple_transaction_gas()) |
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|> Decimal.round(2) |
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end |
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defp priority_with_base_fee(priority, base_fee) do |
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priority |> Wei.from(:wei) |> Wei.sum(base_fee) |> Wei.to(:gwei) |> Decimal.to_float() |> Float.ceil(2) |
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priority |> Wei.from(:wei) |> Wei.sum(base_fee) |
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end |
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defp gas_price(value) do |
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value |> Wei.from(:wei) |> Wei.to(:gwei) |> Decimal.to_float() |> Float.ceil(2) |
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value |> Wei.from(:wei) |
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end |
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defp format_wei(wei), do: wei |> Wei.to(:gwei) |> Decimal.to_float() |> Float.ceil(2) |
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def global_ttl, do: Application.get_env(:explorer, __MODULE__)[:global_ttl] |
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defp simple_transaction_gas, do: Application.get_env(:explorer, __MODULE__)[:simple_transaction_gas] |
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defp num_of_blocks, do: Application.get_env(:explorer, __MODULE__)[:num_of_blocks] |
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defp safelow, do: Application.get_env(:explorer, __MODULE__)[:safelow_percentile] |
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@ -181,12 +281,14 @@ defmodule Explorer.Chain.Cache.GasPriceOracle do |
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{:ok, task} = |
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Task.start(fn -> |
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try do |
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result = get_average_gas_price(num_of_blocks(), safelow(), average(), fast()) |
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{result, acc} = get_average_gas_price(num_of_blocks(), safelow(), average(), fast()) |
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set_gas_prices_acc(acc) |
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set_gas_prices(result) |
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set_updated_at(DateTime.utc_now()) |
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rescue |
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e -> |
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Logger.debug([ |
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Logger.error([ |
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"Couldn't update gas used gas_prices", |
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Exception.format(:error, e, __STACKTRACE__) |
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]) |
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@ -198,6 +300,10 @@ defmodule Explorer.Chain.Cache.GasPriceOracle do |
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{:update, task} |
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end |
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defp handle_fallback(:gas_prices_acc) do |
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{:return, []} |
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end |
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defp handle_fallback(_), do: {:return, nil} |
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# By setting this as a `callback` an async task will be started each time the |
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Victor Baranov
11 months ago
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GitHub