Class: CartoCSSHelper::OverpassDownloader

Inherits:
Object
  • Object
show all
Defined in:
lib/cartocss_helper/overpass_downloader.rb

Defined Under Namespace

Classes: OverpassRefusedResponse

Class Method Summary collapse

Class Method Details

.cache_filename(query) ⇒ Object 



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# File 'lib/cartocss_helper/overpass_downloader.rb', line 12

def self.cache_filename(query)
  hash = Digest::SHA1.hexdigest query
  query_cache_filename = CartoCSSHelper::Configuration.get_path_to_folder_for_overpass_cache + hash + '_query.cache'
  return query_cache_filename
end

.cache_timestamp(query) ⇒ Object 



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# File 'lib/cartocss_helper/overpass_downloader.rb', line 18

def self.cache_timestamp(query)
  downloader = GenericCachedDownloader.new
  return downloader.get_cache_timestamp(cache_filename(query))
end

.format_query_into_url(query) ⇒ Object 



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# File 'lib/cartocss_helper/overpass_downloader.rb', line 56

def self.format_query_into_url(query)
  query = query.gsub(/\/\/.*\n/, '') # add proper parsing - it will mutilate // inside quotes etc
  query = query.gsub('\\', '\\\\')
  query = query.delete("\n")
  query = query.delete("\t")
  query = URI.escape(query)
  query = query.gsub("&", "%26")
  if query.length > 8174 #8175 is too much and allows crashes
    raise 'see https://github.com/matkoniecz/CartoCSSHelper/issues/35'
  end
  base_overpass_url = OverpassDownloader.get_overpass_instance_url
  return base_overpass_url + '/interpreter?data=' + query
end

.get_allowed_timeout_in_seconds ⇒ Object 



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# File 'lib/cartocss_helper/overpass_downloader.rb', line 52

def self.get_allowed_timeout_in_seconds
  return 10 * 60
end

.get_overpass_instance_url ⇒ Object 



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# File 'lib/cartocss_helper/overpass_downloader.rb', line 70

def self.get_overpass_instance_url
  return CartoCSSHelper::Configuration.get_overpass_instance_url
end

.run_overpass_query(query, description, invalidate_cache: false) ⇒ Object 



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# File 'lib/cartocss_helper/overpass_downloader.rb', line 23

def self.run_overpass_query(query, description, invalidate_cache: false)
  url = OverpassDownloader.format_query_into_url(query)
  timeout = OverpassDownloader.get_allowed_timeout_in_seconds
  downloader = GenericCachedDownloader.new(timeout: timeout, stop_on_timeout: false)
  return downloader.get_specified_resource(url, cache_filename(query), description: description, invalidate_cache: invalidate_cache)
rescue RequestTimeout => e
  puts 'Overpass API refused to process this request. It will be not attempted again, most likely query is too complex. It is also possible that Overpass servers are unavailable'
  puts
  puts query
  puts
  puts url
  puts
  puts e
  raise OverpassRefusedResponse
rescue ExceptionWithResponse => e
  if e.http_code == 400
    puts "invalid query"
    puts
    puts query
    puts
    puts url
    puts
    puts e
  elsif e.http_code == 414
    puts 'see https://github.com/matkoniecz/CartoCSSHelper/issues/35'
  end
  raise e
end