Class: BandcampDiscover::Scrapers::Music

Inherits:
Base
  • Object
show all
Defined in:
lib/bandcamp-discover/scrapers/music.rb

Instance Method Summary collapse

Constructor Details

#initialize(url:, browser:, max_tasks:) ⇒ Music

Returns a new instance of Music.



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# File 'lib/bandcamp-discover/scrapers/music.rb', line 9

def initialize(url:, browser:, max_tasks:)
  super

  uri = URI.parse(url)
  @base_url = "#{uri.scheme}://#{uri.host}"
end

Instance Method Details

#normalize_tally(tally) ⇒ Object 



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# File 'lib/bandcamp-discover/scrapers/music.rb', line 45

def normalize_tally(tally)
  total = tally.values.sum.to_f
  tally.transform_values! { |count| count / total }
  tally.sort_by { |k, v| v }.reverse.to_h
end

#scrape(force: false) ⇒ Object 



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# File 'lib/bandcamp-discover/scrapers/music.rb', line 16

def scrape(force: false)
  super do |page|
    page.goto(@url)
    album_list = page.wait_for_selector("#music-grid")
    album_links = album_list.query_selector_all("li.music-grid-item > a")

    semaphore = Async::Semaphore.new(@max_tasks)

    albums = album_links.take(20).map do |album_link|
      semaphore.async do
        url = album_link[:href].start_with?("https://") ? album_link[:href] : "#{@base_url}#{album_link[:href]}"
        puts "starting to scrape #{url}"

        album = Scrapers::Album.new(url: url, browser: @browser).scrape

        puts "done scraping #{url}"

        album
      end
    end.map(&:wait)

    albums.map! do |album_url, album_title, album_tags, album_player|
      { url: album_url, title: album_title, tags: album_tags, player_url: album_player }
    end

    [albums, normalize_tally(albums.map { _1[:tags] }.flatten.tally)]
  end
end