19b4a5bd59
All 16 mock products now have at least one variant so add-to-cart works in demo mode. CSSCache.invalidate/0 rescues ArgumentError when the ETS table doesn't exist yet (seed_defaults runs before CSSCache starts). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
122 lines
2.2 KiB
Elixir
122 lines
2.2 KiB
Elixir
defmodule SimpleshopTheme.Theme.CSSCache do
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@moduledoc """
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GenServer that maintains an ETS table for caching generated theme CSS.
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This provides fast lookups for theme CSS without regenerating it on every request.
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The cache is invalidated when theme settings are updated.
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"""
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use GenServer
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@table_name :theme_css_cache
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## Client API
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@doc """
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Starts the CSS cache GenServer.
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"""
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def start_link(opts) do
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GenServer.start_link(__MODULE__, opts, name: __MODULE__)
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end
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@doc """
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Gets cached CSS for the site theme.
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Returns `{:ok, css}` if found in cache, or `:miss` if not cached.
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## Examples
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iex> CSSCache.get()
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{:ok, "/* Theme CSS ... */"}
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iex> CSSCache.get()
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:miss
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"""
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def get do
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case :ets.lookup(@table_name, :site_theme) do
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[{:site_theme, css}] -> {:ok, css}
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[] -> :miss
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end
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end
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@doc """
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Caches CSS for the site theme.
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## Examples
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iex> CSSCache.put(css_string)
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:ok
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"""
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def put(css) when is_binary(css) do
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:ets.insert(@table_name, {:site_theme, css})
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:ok
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end
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@doc """
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Invalidates the cached CSS, forcing regeneration on next request.
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## Examples
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iex> CSSCache.invalidate()
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:ok
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"""
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def invalidate do
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:ets.delete(@table_name, :site_theme)
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:ok
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rescue
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ArgumentError -> :ok
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end
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@doc """
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Warms the cache by generating and storing CSS from current theme settings.
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## Examples
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iex> CSSCache.warm()
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:ok
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"""
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def warm do
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alias SimpleshopTheme.Settings
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alias SimpleshopTheme.Theme.CSSGenerator
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settings = Settings.get_theme_settings()
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# Use endpoint's static_path for digested URLs in production
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path_resolver = &SimpleshopThemeWeb.Endpoint.static_path/1
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css = CSSGenerator.generate(settings, path_resolver)
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put(css)
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:ok
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end
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## Server Callbacks
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@impl true
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def init(_opts) do
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:ets.new(@table_name, [
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:set,
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:public,
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:named_table,
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read_concurrency: true,
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write_concurrency: false
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])
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{:ok, %{}, {:continue, :warm}}
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end
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@impl true
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def handle_continue(:warm, state) do
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try do
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warm()
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rescue
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_ -> :ok
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end
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{:noreply, state}
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end
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end
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