67 lines
1.6 KiB
Crystal
67 lines
1.6 KiB
Crystal
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# See http://www.evanmiller.org/how-not-to-sort-by-average-rating.html
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def ci_lower_bound(pos, n)
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if n == 0
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return 0
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end
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# z value here represents a confidence level of 0.95
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z = 1.96
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phat = 1.0*pos/n
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return (phat + z*z/(2*n) - z * Math.sqrt((phat*(1 - phat) + z*z/(4*n))/n))/(1 + z*z/n)
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end
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def elapsed_text(elapsed)
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millis = elapsed.total_milliseconds
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return "#{millis.round(2)}ms" if millis >= 1
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"#{(millis * 1000).round(2)}µs"
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end
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def get_client
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while POOL.empty?
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sleep rand(0..10).milliseconds
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end
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return POOL.shift
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end
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def fetch_video(id)
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# Grab connection from pool
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client = get_client
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info = client.get("/get_video_info?video_id=#{id}&el=detailpage&ps=default&eurl=&gl=US&hl=en").body
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info = HTTP::Params.parse(info)
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html = client.get("/watch?v=#{id}").body
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html = XML.parse_html(html)
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if info["reason"]?
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raise info["reason"]
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end
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# Return connection to pool
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POOL << client
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video = Video.new(id, info, html, Time.now)
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return video
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end
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def get_video(id, refresh = true)
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if PG_DB.query_one?("SELECT EXISTS (SELECT true FROM videos WHERE id = $1)", id, as: Bool)
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video = PG_DB.query_one("SELECT * FROM videos WHERE id = $1", id, as: Video)
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# If record was last updated more than 5 hours ago, refresh (expire param in response lasts for 6 hours)
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if refresh && Time.now - video.updated > Time::Span.new(0, 5, 0, 0)
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video = fetch_video(id)
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PG_DB.exec("UPDATE videos SET info = $2, html = $3, updated = $4 WHERE id = $1", video.to_a)
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end
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else
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video = fetch_video(id)
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PG_DB.exec("INSERT INTO videos VALUES ($1, $2, $3, $4)", video.to_a)
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end
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return video
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end
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