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