Created
February 21, 2011 16:32
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require 'rubygems' | |
require 'open-uri' | |
require 'json' | |
SEARCH = "(collection:prelinger+OR+mediatype:prelinger)+AND+-mediatype:collection" | |
ALL_FIELDS = "&fl[]=avg_rating&fl[]=call_number&fl[]=collection&fl[]=contributor&fl[]=coverage&fl[]=creator&fl[]=date&fl[]=description&fl[]=downloads&fl[]=foldoutcount&fl[]=format&fl[]=headerImage&fl[]=identifier&fl[]=imagecount&fl[]=language&fl[]=licenseurl&fl[]=mediatype&fl[]=month&fl[]=num_reviews&fl[]=oai_updatedate&fl[]=publicdate&fl[]=publisher&fl[]=rights&fl[]=scanningcentre&fl[]=source&fl[]=subject&fl[]=title&fl[]=type&fl[]=volume&fl[]=week&fl[]=year" | |
ID_FIELD_ONLY = "&fl[]=identifier" | |
def mkdirs() | |
["meta", "reviews", "files"].each do |dir| | |
if !File.exists?("#{ARGV[0]}/#{dir}") | |
Dir.mkdir("#{ARGV[0]}/#{dir}") | |
end | |
end | |
end | |
def fetch_ids(fields, rows="50") | |
url = URI.parse( "http://www.archive.org/advancedsearch.php?q=#{SEARCH}#{fields}&rows=#{rows}&page=1&output=json&save=yes") | |
data = url.read | |
return data | |
end | |
def fetch_file(id, type="meta") | |
url = URI.parse( "http://www.archive.org/download/#{id}/#{id}_#{type}.xml" ) | |
data = url.read | |
return data | |
end | |
def crawl(json) | |
puts "Crawling #{ json["response"]["numFound"] } records" | |
json["response"]["docs"].each do |result| | |
["meta", "files", "reviews"].each do |stage| | |
begin | |
File.open( "#{ARGV[0]}/#{stage}/#{result["identifier"]}.xml", "w") do |f| | |
data = fetch_file( result["identifier"], stage ) | |
f.puts( data ) | |
end | |
rescue => e | |
puts e | |
puts e.backtrace | |
puts "Failed to fetch #{result["identifier"]} #{stage}" | |
end | |
end | |
end | |
end | |
mkdirs() | |
#cache identifiers locally | |
File.open("#{ARGV[0]}/ids.json", "w") do |f| | |
f.puts fetch_ids(ID_FIELD_ONLY) | |
end | |
#parse and crawl | |
json = JSON.load( File.new( "#{ARGV[0]}/ids.json") ) | |
crawl(json) |
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