54 lines
1.2 KiB
Elixir
54 lines
1.2 KiB
Elixir
defmodule Heroicons.Cache do
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@moduledoc """
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An ETS-backed cache for icons. We cache both pre-compiled Phoenix Components and icon bodies as strings.
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Uses the icon's path on disk as a key.
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"""
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use GenServer
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@name __MODULE__
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@doc false
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def start_link(_), do: GenServer.start_link(__MODULE__, [], name: @name)
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@doc "Fetch a icon's body and fingerprint from the cache or disk, given a `path`"
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def fetch_icon(path) do
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case :ets.lookup(@name, path) do
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[{^path, icon_body, fingerprint}] ->
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{icon_body, fingerprint}
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[] ->
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GenServer.call(@name, {:cache_icon, path})
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end
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end
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@impl true
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def init(_) do
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:ets.new(@name, [:set, :protected, :named_table])
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{:ok, []}
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end
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@impl true
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def handle_call({:cache_icon, path}, _ref, state) do
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{icon_body, fingerprint} = read_icon(path)
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:ets.insert_new(@name, {path, icon_body, fingerprint})
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{:reply, {icon_body, fingerprint}, state}
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end
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defp read_icon(path) do
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icon =
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Path.join(:code.priv_dir(:heroicons), path)
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|> File.read!()
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<<"<svg", icon_body::binary>> = icon
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<<fingerprint::8*16>> = :erlang.md5(icon)
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{icon_body, fingerprint}
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end
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end
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