Claudio Ortolina
56 lines
1.5 KiB
Elixir
56 lines
1.5 KiB
Elixir
defmodule LastFm.Feed do
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@moduledoc """
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Holds a in-memory cache of scrobbled tracks.
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Tracks are keyed and ASC ordered by their scrobbling unix timestamp. While this
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is technically prone to collision, it's very unlikely for that to happen since
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scrobbles are sequential events that occur over time - a user can likely only listen
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to one track at a time, and the timestamp has second-level precision.
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"""
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import Ecto.Query
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@insertable_fields [
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:musicbrainz_id,
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:title,
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:artist,
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:album,
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:cover_url,
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:scrobbled_at_uts,
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:scrobbled_at_label,
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:last_fm_data
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]
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@spec update([LastFm.Track.t()]) :: :ok | no_return
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def update(tracks) do
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track_params =
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tracks
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|> Enum.map(fn t -> Map.take(t, @insertable_fields) end)
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|> Enum.map(&Map.to_list/1)
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# HACK: if two tracks happen to have the exact same scrobbled_at_uts,
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# we move it by a sec.
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MusicLibrary.Repo.insert_all(LastFm.Track, track_params,
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on_conflict: :nothing,
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conflict_target: [:scrobbled_at_uts, :title]
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)
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Phoenix.PubSub.broadcast(LastFm.PubSub, "feed:update", %{tracks: tracks})
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end
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@spec all_tracks(non_neg_integer()) :: [LastFm.Track.t()]
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def all_tracks(limit) do
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q =
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from t in LastFm.Track,
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order_by: {:desc, t.scrobbled_at_uts},
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limit: ^limit
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MusicLibrary.Repo.all(q)
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end
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@spec subscribe() :: :ok
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def subscribe do
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Phoenix.PubSub.subscribe(LastFm.PubSub, "feed:update")
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end
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end
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