Move functions into helpers.cr

src/helpers.cr

@@ -1,7 +1,57 @@
+class Video
+  module HTTPParamConverter
+    def self.from_rs(rs)
+      HTTP::Params.parse(rs.read(String))
+    end
+  end
+
+  module XMLConverter
+    def self.from_rs(rs)
+      XML.parse_html(rs.read(String))
+    end
+  end
+
+  def initialize(id, info, html, updated, title, views, likes, dislikes, wilson_score)
+    @id = id
+    @info = info
+    @html = html
+    @updated = updated
+    @title = title
+    @views = views
+    @likes = likes
+    @dislikes = dislikes
+    @wilson_score = wilson_score
+  end
+
+  def to_a
+    return [@id, @info, @html, @updated, @title, @views, @likes, @dislikes, @wilson_score]
+  end
+
+  DB.mapping({
+    id:   String,
+    info: {
+      type:      HTTP::Params,
+      default:   HTTP::Params.parse(""),
+      converter: Video::HTTPParamConverter,
+    },
+    html: {
+      type:      XML::Node,
+      default:   XML.parse_html(""),
+      converter: Video::XMLConverter,
+    },
+    updated:      Time,
+    title:        String,
+    views:        Int64,
+    likes:        Int32,
+    dislikes:     Int32,
+    wilson_score: Float64,
+  })
+end
+
 # See http://www.evanmiller.org/how-not-to-sort-by-average-rating.html
 def ci_lower_bound(pos, n)
   if n == 0
-    return 0
+    return 0.0
   end
 
   # z value here represents a confidence level of 0.95
@@ -18,57 +68,67 @@ def elapsed_text(elapsed)
   "#{(millis * 1000).round(2)}µs"
 end
 
-def get_client
-  while POOL.empty?
+def get_client(pool)
+  while pool.empty?
     sleep rand(0..10).milliseconds
   end
 
-  return POOL.shift
+  return pool.shift
 end
 
-def fetch_video(id)
-  # Grab connection from pool
-  client = get_client
-
+def fetch_video(id, client)
+  begin
     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
+  end
+
   html = XML.parse_html(html)
+  info = HTTP::Params.parse(info)
 
   if info["reason"]?
     raise info["reason"]
   end
 
-  # Return connection to pool
-  POOL << client
+  title = info["title"]
+
+  views = info["view_count"].to_i64
+
+  likes = html.xpath_node(%q(//button[@title="I like this"]/span))
+  likes = likes ? likes.content.delete(",").to_i : 1
 
-  video = Video.new(id, info, html, Time.now)
+  dislikes = html.xpath_node(%q(//button[@title="I dislike this"]/span))
+  dislikes = dislikes ? dislikes.content.delete(",").to_i : 0
+
+  wilson_score = ci_lower_bound(likes, likes + dislikes)
+
+  video = Video.new(id, info, html, Time.now, title, views, likes, dislikes, wilson_score)
 
   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)
+def get_video(id, client, db, refresh = true)
+  if db.query_one?("SELECT EXISTS (SELECT true FROM videos WHERE id = $1)", id, as: Bool)
+    video = 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)
+    # If record was last updated over an hour ago, refresh (expire param in response lasts for 6 hours)
+    if refresh && Time.now - video.updated > 1.hours
+      video = fetch_video(id, client)
+      db.exec("UPDATE videos SET info = $2, html = $3, updated = $4,\
+       title = $5, views = $6, likes = $7, dislikes = $8, wilson_score = $9 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)
+    video = fetch_video(id, client)
+    db.exec("INSERT INTO videos VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9)", video.to_a)
   end
 
   return video
 end
 
-def search(query)
-  client = get_client
-
+def search(query, client)
+  begin
     html = client.get("https://www.youtube.com/results?q=#{query}&sp=EgIQAVAU").body
+  end
+
   html = XML.parse_html(html)
 
   html.xpath_nodes(%q(//ol[@class="item-section"]/li)).each do |item|
@@ -80,6 +140,4 @@ def search(query)
       end
     end
   end
-
-  POOL << client
 end

src/invidious.cr

@@ -1,8 +1,5 @@
-require "http/client"
-require "json"
 require "kemal"
 require "pg"
-require "time"
 require "xml"
 require "./helpers"
 
@@ -17,44 +14,51 @@ CONTEXT.add_options(
 )
 POOL = Deque.new(30) do
   client = HTTP::Client.new(URL, CONTEXT)
-  client.connect_timeout = Time::Span.new(0, 0, 0, 5)
+  client.read_timeout = 5.seconds
+  client.connect_timeout = 5.seconds
   client
 end
 
-# Refresh connections by crawling YT
-spawn do
-  # Start video
-  ids = Deque.new(10, "_wbqqI0IgY8")
+# Refresh pool by crawling YT
+10.times do
+  spawn do
+    io = STDOUT
+    ids = Deque(String).new
     random = Random.new
+    client = get_client(POOL)
 
-  search(random.base64(3)) do |id|
+    search(random.base64(3), client) do |id|
       ids << id
     end
 
     loop do
-    if ids.size < 5
-      search(random.base64) do |id|
+      if ids.empty?
+        search(random.base64(3), client) do |id|
           ids << id
-        puts "refreshed ids"
         end
       end
 
-    if rand(600) < 1
-      client = get_client
+      if rand(300) < 1
         client = HTTP::Client.new(URL, CONTEXT)
-      client.connect_timeout = Time::Span.new(0, 0, 0, 5)
+        client.read_timeout = 5.seconds
+        client.connect_timeout = 5.seconds
         POOL << client
       end
 
       time = Time.now
 
       begin
-      id = ids[rand(ids.size)]
-      video = get_video(id, false)
-      ids.delete(id)
+        id = ids[0]
+        video = get_video(id, client, PG_DB, false)
       rescue ex
-      puts ex
+        io << id << " : " << ex << "\n"
+        client = HTTP::Client.new(URL, CONTEXT)
+        client.read_timeout = 5.seconds
+        client.connect_timeout = 5.seconds
+        POOL << client
         next
+      ensure
+        ids.delete(id)
       end
 
       rvs = [] of Hash(String, String)
@@ -65,17 +69,17 @@ spawn do
       end
 
       rvs.each do |rv|
-      if rv.has_key?("id")
-        if !PG_DB.query_one?("SELECT EXISTS (SELECT true FROM videos WHERE id = $1)", rv["id"], as: Bool)
+        if rv.has_key?("id") && !PG_DB.query_one?("SELECT EXISTS (SELECT true FROM videos WHERE id = $1)", rv["id"], as: Bool)
+          ids.delete(id)
           ids << rv["id"]
-          if ids.size == 50
+          if ids.size == 150
             ids.shift
           end
         end
       end
-    end
 
-    puts "#{Time.now} 200 GET www.youtube.com/watch?v=#{video.id} #{elapsed_text(Time.now - time)}"
+      io << Time.now << " 200 GET www.youtube.com/watch?v=" << video.id << " " << elapsed_text(Time.now - time) << "\n"
+    end
   end
 end
 
@@ -83,46 +87,6 @@ macro templated(filename)
   render "src/views/#{{{filename}}}.ecr", "src/views/layout.ecr"
 end
 
-class Video
-  module HTTPParamConverter
-    def self.from_rs(rs)
-      HTTP::Params.parse(rs.read(String))
-    end
-  end
-
-  module XMLConverter
-    def self.from_rs(rs)
-      XML.parse_html(rs.read(String))
-    end
-  end
-
-  def initialize(id, info, html, updated)
-    @id = id
-    @info = info
-    @html = html
-    @updated = updated
-  end
-
-  def to_a
-    return [@id, @info, @html, @updated]
-  end
-
-  DB.mapping({
-    id:   String,
-    info: {
-      type:      HTTP::Params,
-      default:   HTTP::Params.parse(""),
-      converter: Video::HTTPParamConverter,
-    },
-    html: {
-      type:      XML::Node,
-      default:   XML.parse_html(""),
-      converter: Video::XMLConverter,
-    },
-    updated: Time,
-  })
-end
-
 get "/" do |env|
   templated "index"
 end
@@ -133,8 +97,9 @@ get "/watch" do |env|
 
   env.params.query.delete_all("listen")
 
+  client = get_client(POOL)
   begin
-    video = get_video(id)
+    video = get_video(id, client, PG_DB)
   rescue ex
     error_message = ex.message
     next templated "error"
@@ -153,6 +118,7 @@ get "/watch" do |env|
       adaptive_fmts << HTTP::Params.parse(string)
     end
   end
+
   rvs = [] of Hash(String, String)
   if video.info.has_key?("rvs")
     video.info["rvs"].split(",").each do |rv|
@@ -162,20 +128,13 @@ get "/watch" do |env|
 
   player_response = JSON.parse(video.info["player_response"])
 
-  likes = video.html.xpath_node(%q(//button[@title="I like this"]/span))
-  likes = likes ? likes.content.delete(",").to_i : 1
-
-  dislikes = video.html.xpath_node(%q(//button[@title="I dislike this"]/span))
-  dislikes = dislikes ? dislikes.content.delete(",").to_i : 1
-
   description = video.html.xpath_node(%q(//p[@id="eow-description"]))
   description = description ? description.to_xml : "Could not load description"
 
-  views = video.info["view_count"].to_i64
   rating = video.info["avg_rating"].to_f64
 
-  engagement = ((dislikes.to_f + likes.to_f)/views * 100)
-  calculated_rating = (likes.to_f/(likes.to_f + dislikes.to_f) * 4 + 1)
+  engagement = ((video.dislikes.to_f + video.likes.to_f)/video.views * 100)
+  calculated_rating = (video.likes.to_f/(video.likes.to_f + video.dislikes.to_f) * 4 + 1)
 
   templated "watch"
 end
@@ -184,7 +143,7 @@ get "/search" do |env|
   query = env.params.query["q"]
   page = env.params.query["page"]? && env.params.query["page"].to_i? ? env.params.query["page"].to_i : 1
 
-  client = get_client
+  client = get_client(POOL)
 
   html = client.get("https://www.youtube.com/results?q=#{URI.escape(query)}&page=#{page}&sp=EgIQAVAU").body
   html = XML.parse_html(html)