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Library for accessibility snapshot testing in Phoenix applications using axe-core and Playwright.
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lib/telemetry_capture/enrichers/assign_sizes.ex
defmodule Excessibility.TelemetryCapture.Enrichers.AssignSizes do
@moduledoc """
Enriches timeline events with per-assign byte size information.
Replaces the old Memory enricher. Tracks individual assign sizes
plus total memory, enabling the assign_diff analyzer to detect
large assigns that get re-diffed frequently.
## Example Output
%{
assign_sizes: %{current_user: 12400, products: 8200, filter: 120},
total_memory: 20720,
largest_assign: {:current_user, 12400}
}
"""
@behaviour Excessibility.TelemetryCapture.Enricher
@skip_keys [:flash, :__changed__, :__temp__]
def name, do: :assign_sizes
def cost, do: :expensive
def enrich(assigns, _opts) do
sizes =
assigns
|> Enum.reject(fn {key, _} -> key in @skip_keys or private_key?(key) end)
|> Map.new(fn {key, value} -> {key, byte_size(:erlang.term_to_binary(value))} end)
total = sizes |> Map.values() |> Enum.sum()
largest =
if map_size(sizes) > 0 do
Enum.max_by(sizes, fn {_k, v} -> v end)
end
%{
assign_sizes: sizes,
total_memory: total,
largest_assign: largest
}
end
defp private_key?(key) do
key |> Atom.to_string() |> String.starts_with?("_")
end
end