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45 lines
1.5 KiB
45 lines
1.5 KiB
# The leaderboard payload as published by Api::V1::LeaderboardController.
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#
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# The API serves this out of a short cache, so what a consumer of the endpoint
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# sees is whatever landed in `CACHE_KEY` on the last refresh -- not a live read
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# of the players table. The admin screen reads that same cached entry, which is
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# why the key, the TTL and the shape all live here rather than in the
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# controller: one place publishes, both places agree on what "published" means.
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class LeaderboardPayload
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CACHE_KEY = "api/v1/leaderboard".freeze
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TTL = 1.minute
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# What the API returns. Recomputes and republishes when the cache is cold.
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def self.fetch
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Rails.cache.fetch(CACHE_KEY, expires_in: TTL) do
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DemoActivity.simulate! # TEMP: fake gameplay so the banner has moving numbers
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build
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end
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end
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# The currently published payload, or nil when the cache has expired and no
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# one has called the endpoint since. Never computes, never publishes -- the
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# admin screen uses this to show what consumers are actually being served.
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def self.published
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Rails.cache.read(CACHE_KEY)
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end
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# A fresh payload that is NOT written to the cache and does not invent demo
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# players. This is what the next API call would publish.
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def self.build
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leaderboard = LeaderboardScore.call
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{
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leaderboard: leaderboard,
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badges: LeaderboardBadges.call(leaderboard),
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updated_at: Time.current
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}
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end
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def self.expire!
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Rails.cache.delete(CACHE_KEY)
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end
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end
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