Split helpers.cr into multiple files

src/invidious/channels.cr

@@ -0,0 +1,132 @@
+class InvidiousChannel
+  add_mapping({
+    id:      String,
+    author:  String,
+    updated: Time,
+  })
+end
+
+class ChannelVideo
+  add_mapping({
+    id:        String,
+    title:     String,
+    published: Time,
+    updated:   Time,
+    ucid:      String,
+    author:    String,
+  })
+end
+
+def get_channel(id, client, db, refresh = true, pull_all_videos = true)
+  if db.query_one?("SELECT EXISTS (SELECT true FROM channels WHERE id = $1)", id, as: Bool)
+    channel = db.query_one("SELECT * FROM channels WHERE id = $1", id, as: InvidiousChannel)
+
+    if refresh && Time.now - channel.updated > 10.minutes
+      channel = fetch_channel(id, client, db, pull_all_videos)
+      channel_array = channel.to_a
+      args = arg_array(channel_array)
+
+      db.exec("INSERT INTO channels VALUES (#{args}) \
+        ON CONFLICT (id) DO UPDATE SET updated = $3", channel_array)
+    end
+  else
+    channel = fetch_channel(id, client, db, pull_all_videos)
+    args = arg_array(channel.to_a)
+    db.exec("INSERT INTO channels VALUES (#{args})", channel.to_a)
+  end
+
+  return channel
+end
+
+def fetch_channel(ucid, client, db, pull_all_videos = true)
+  rss = client.get("/feeds/videos.xml?channel_id=#{ucid}").body
+  rss = XML.parse_html(rss)
+
+  author = rss.xpath_node(%q(//feed/title))
+  if !author
+    raise "Deleted or invalid channel"
+  end
+  author = author.content
+
+  if !pull_all_videos
+    rss.xpath_nodes("//feed/entry").each do |entry|
+      video_id = entry.xpath_node("videoid").not_nil!.content
+      title = entry.xpath_node("title").not_nil!.content
+      published = Time.parse(entry.xpath_node("published").not_nil!.content, "%FT%X%z", Time::Location.local)
+      updated = Time.parse(entry.xpath_node("updated").not_nil!.content, "%FT%X%z", Time::Location.local)
+      author = entry.xpath_node("author/name").not_nil!.content
+      ucid = entry.xpath_node("channelid").not_nil!.content
+
+      video = ChannelVideo.new(video_id, title, published, Time.now, ucid, author)
+
+      db.exec("UPDATE users SET notifications = notifications || $1 \
+        WHERE updated < $2 AND $3 = ANY(subscriptions) AND $1 <> ALL(notifications)", video.id, video.published, ucid)
+
+      video_array = video.to_a
+      args = arg_array(video_array)
+      db.exec("INSERT INTO channel_videos VALUES (#{args}) \
+        ON CONFLICT (id) DO UPDATE SET title = $2, published = $3, \
+        updated = $4, ucid = $5, author = $6", video_array)
+    end
+  else
+    videos = [] of ChannelVideo
+    page = 1
+
+    loop do
+      url = produce_videos_url(ucid, page)
+      response = client.get(url)
+
+      json = JSON.parse(response.body)
+      content_html = json["content_html"].as_s
+      if content_html.empty?
+        # If we don't get anything, move on
+        break
+      end
+      document = XML.parse_html(content_html)
+
+      document.xpath_nodes(%q(//li[contains(@class, "feed-item-container")])).each do |item|
+        anchor = item.xpath_node(%q(.//h3[contains(@class,"yt-lockup-title")]/a))
+        if !anchor
+          raise "could not find anchor"
+        end
+
+        title = anchor.content.strip
+        video_id = anchor["href"].lchop("/watch?v=")
+
+        published = item.xpath_node(%q(.//div[@class="yt-lockup-meta"]/ul/li[1]))
+        if !published
+          # This happens on Youtube red videos, here we just skip them
+          next
+        end
+        published = published.content
+        published = decode_date(published)
+
+        videos << ChannelVideo.new(video_id, title, published, Time.now, ucid, author)
+      end
+
+      if document.xpath_nodes(%q(//li[contains(@class, "channels-content-item")])).size < 30
+        break
+      end
+
+      page += 1
+    end
+
+    video_ids = [] of String
+    videos.each do |video|
+      db.exec("UPDATE users SET notifications = notifications || $1 \
+        WHERE updated < $2 AND $3 = ANY(subscriptions) AND $1 <> ALL(notifications)", video.id, video.published, ucid)
+      video_ids << video.id
+
+      video_array = video.to_a
+      args = arg_array(video_array)
+      db.exec("INSERT INTO channel_videos VALUES (#{args}) ON CONFLICT (id) DO NOTHING", video_array)
+    end
+
+    # When a video is deleted from a channel, we find and remove it here
+    db.exec("DELETE FROM channel_videos * WHERE NOT id = ANY ('{#{video_ids.map { |a| %("#{a}") }.join(",")}}') AND ucid = $1", ucid)
+  end
+
+  channel = InvidiousChannel.new(ucid, author, Time.now)
+
+  return channel
+end