Class: Quandl::Connection

Inherits:
Object
  • Object
show all
Defined in:
lib/quandl/connection.rb

Class Method Summary collapse

Class Method Details

.execute_request(opts, &block) ⇒ Object 



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# File 'lib/quandl/connection.rb', line 23

def self.execute_request(opts, &block)
  RestClient::Request.execute(opts, &block)
rescue RestClient::ExceptionWithResponse => e
  handle_api_error(e.response) if e.response
  raise e
end

.general_error(rcode, rbody) ⇒ Object 



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# File 'lib/quandl/connection.rb', line 36

def self.general_error(rcode, rbody)
  QuandlError.new("Invalid response object from API: #{rbody.inspect} " \
               "(HTTP response code was #{rcode})", rcode, rbody)
end

.handle_api_error(resp) ⇒ Object 



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# File 'lib/quandl/connection.rb', line 41

def self.handle_api_error(resp)
  error_body = parse(resp.body)
  code = error_body['quandl_error']['code']
  message = error_body['quandl_error']['message']
  code_letter = code.match(/QE([a-zA-Z])x/).captures.first

  case code_letter
  when 'L'
    fail LimitExceededError.new(message, resp.code, resp.body, error_body,
                                resp.headers, code)
  when 'M'
    fail InternalServerError.new(message, resp.code, resp.body, error_body,
                                 resp.headers, code)
  when 'A'
    fail AuthenticationError.new(message, resp.code, resp.body, error_body,
                                 resp.headers, code)
  when 'P'
    fail ForbiddenError.new(message, resp.code, resp.body, error_body,
                            resp.headers, code)
  when 'S'
    fail InvalidRequestError.new(message, resp.code, resp.body, error_body,
                                 resp.headers, code)
  when 'C'
    fail NotFoundError.new(message, resp.code, resp.body, error_body,
                           resp.headers, code)
  when 'X'
    fail ServiceUnavailableError.new(message, resp.code, resp.body,
                                     error_body, resp.headers, code)
  else
    fail QuandlError.new(message, resp.code, resp.body, error_body,
                         resp.headers, code)
  end
end

.parse(response) ⇒ Object 



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# File 'lib/quandl/connection.rb', line 30

def self.parse(response)
  ActiveSupport::HashWithIndifferentAccess.new(JSON.parse(response))
rescue JSON::ParserError
  raise general_error(response.code, response.body)
end

.request(http_verb, url, options = {}, &block) ⇒ Object 



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# File 'lib/quandl/connection.rb', line 3

def self.request(http_verb, url, options = {}, &block)
  params = options.delete(:params) || {}
  headers = options.delete(:headers) || {}
  accept_value = 'application/json'
  accept_value += ", application/vnd.quandl+json;version=#{ApiConfig.api_version}" if ApiConfig.api_version
  headers = { accept: accept_value, request_source: 'ruby', request_source_version: Quandl::VERSION }.merge(headers)
  headers = { x_api_token: ApiConfig.api_key }.merge(headers) if ApiConfig.api_key

  request_url = ApiConfig.api_base + '/' + url
  request_url = request_url + '?' + params.to_query if params.present?

  request_opts = { url: request_url, headers: headers, method: http_verb }
  response = execute_request(request_opts, &block)

  return response if block_given?

  response_data = Quandl::Util.convert_to_dates(parse(response))
  [response, response_data]
end