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9998e06caa
Avoid fetching each user by passing in full pre-fetched presences from Presence.fetch/2 callback. Use temporary assigns in ProfileLive to avoid duping presences in memeory. Handle removes by a small hook event
65 lines
2 KiB
Elixir
65 lines
2 KiB
Elixir
defmodule LiveBeatsWeb.Presence do
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@moduledoc """
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Provides presence tracking to channels and processes.
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See the [`Phoenix.Presence`](http://hexdocs.pm/phoenix/Phoenix.Presence.html)
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docs for more details.
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"""
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use Phoenix.Presence,
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otp_app: :live_beats,
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pubsub_server: LiveBeats.PubSub
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import Phoenix.LiveView.Helpers
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import LiveBeatsWeb.LiveHelpers
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@pubsub LiveBeats.PubSub
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alias LiveBeats.Accounts
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def listening_now(assigns) do
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~H"""
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<!-- users -->
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<div class="px-4 mt-6 sm:px-6 lg:px-8">
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<h2 class="text-gray-500 text-xs font-medium uppercase tracking-wide">Here now</h2>
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<ul
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id="listening-now"
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phx-update="prepend"
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role="list"
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x-max="1"
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class="grid grid-cols-1 gap-4 sm:gap-4 sm:grid-cols-2 xl:grid-cols-5 mt-3"
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>
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<%= for presence <- @presences do %>
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<li id={"presence-#{presence.id}"} class="relative col-span-1 flex shadow-sm rounded-md overflow-hidden">
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<.link navigate={profile_path(presence)} class="flex-1 flex items-center justify-between border-t border-r border-b border-gray-200 bg-white rounded-r-md truncate">
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<img class="w-10 h-10 flex-shrink-0 flex items-center justify-center rounded-l-md bg-purple-600" src={presence.avatar_url} alt="">
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<div class="flex-1 flex items-center justify-between text-gray-900 text-sm font-medium hover:text-gray-600 pl-3">
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<%= render_slot(@title, presence) %>
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</div>
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</.link>
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</li>
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<% end %>
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</ul>
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</div>
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"""
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end
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def fetch(_topic, presences) do
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users =
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presences
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|> Map.keys()
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|> Accounts.get_users_map()
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|> Enum.into(%{})
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for {key, %{metas: metas}} <- presences, into: %{} do
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{key, %{metas: metas, user: users[String.to_integer(key)]}}
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end
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end
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def subscribe(user_id) do
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Phoenix.PubSub.subscribe(@pubsub, topic(user_id))
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end
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defp topic(profile) do
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"active_users:#{profile.user_id}"
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end
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end
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