mirror of
https://github.com/discourse/discourse.git
synced 2024-11-23 19:37:55 +08:00
51 lines
1.8 KiB
Ruby
51 lines
1.8 KiB
Ruby
require 'open-uri'
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require 'nokogiri'
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require 'excon'
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require_dependency 'retrieve_title'
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require_dependency 'topic_link'
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module Jobs
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class CrawlTopicLink < Jobs::Base
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def execute(args)
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raise Discourse::InvalidParameters.new(:topic_link_id) unless args[:topic_link_id].present?
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topic_link = TopicLink.find_by(id: args[:topic_link_id], internal: false, crawled_at: nil)
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return if topic_link.blank?
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# Look for a topic embed for the URL. If it exists, use its title and don't crawl
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topic_embed = TopicEmbed.where(embed_url: topic_link.url).includes(:topic).references(:topic).first
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# topic could be deleted, so skip
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if topic_embed && topic_embed.topic
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TopicLink.where(id: topic_link.id).update_all(['title = ?, crawled_at = CURRENT_TIMESTAMP', topic_embed.topic.title[0..255]])
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return
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end
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begin
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crawled = false
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# Special case: Images
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# If the link is to an image, put the filename as the title
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if FileHelper.is_supported_image?(topic_link.url)
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uri = URI(topic_link.url)
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filename = File.basename(uri.path)
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crawled = (TopicLink.where(id: topic_link.id).update_all(["title = ?, crawled_at = CURRENT_TIMESTAMP", filename]) == 1)
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end
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unless crawled
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# Fetch the beginning of the document to find the title
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title = RetrieveTitle.crawl(topic_link.url)
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if title.present?
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crawled = (TopicLink.where(id: topic_link.id).update_all(['title = ?, crawled_at = CURRENT_TIMESTAMP', title[0..254]]) == 1)
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end
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end
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rescue Exception
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# If there was a connection error, do nothing
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ensure
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TopicLink.where(id: topic_link.id).update_all('crawled_at = CURRENT_TIMESTAMP') if !crawled && topic_link.present?
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end
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end
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end
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end
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