Class: UrlResolver::Resolver

Inherits:
Object
  • Object
show all
Defined in:
lib/url_resolver/resolver.rb

Instance Method Summary collapse

Instance Method Details

#cache ⇒ Object 



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# File 'lib/url_resolver/resolver.rb', line 5

def cache
  UrlResolver.configuration.url_cache
end

#resolve(url) ⇒ Object 



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# File 'lib/url_resolver/resolver.rb', line 9

def resolve(url)
  url_to_check = URI.escape(url)
  cached_url = cache.get_url(url_to_check)
  return cached_url if cached_url
  
  response = RestClient.head(url_to_check)
  response.args[:url].tap do |final_url|
    cache.set_url(url_to_check, final_url)
  end
rescue SocketError,
  Errno::ETIMEDOUT,
  RestClient::InternalServerError,
  RestClient::ServiceUnavailable,
  RestClient::BadRequest,
  RestClient::GatewayTimeout,
  RestClient::RequestTimeout,
  RestClient::ResourceNotFound,
  RestClient::BadGateway,
  RestClient::MethodNotAllowed,
  RestClient::Forbidden,
  URI::InvalidURIError => e
  
  if e.message == 'getaddrinfo: nodename nor servname provided, or not known'
    response = RestClient.head(url_to_check) { |response, request, result, &block| response }
    url = response.headers[:location] if response.code == 302 && response.headers[:location]
  end
  
  cache.set_url(url_to_check, url) if UrlResolver.configuration.cache_failures
  url
rescue Exception => e
  if e.message =~ /undefined method `request_uri'/
    cache.set_url(url_to_check, url) if UrlResolver.configuration.cache_failures
    url
  else
    raise UrlResolverError.new("#{e.class.to_s}: #{url} (#{e.message})")
  end
end