google-api-ruby-client/lib/google/apis/core/api_command.rb

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# Copyright 2015 Google Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
require 'active_support/inflector'
require 'addressable/uri'
require 'addressable/template'
require 'google/apis/core/http_command'
require 'google/apis/errors'
require 'multi_json'
require 'retriable'
module Google
module Apis
module Core
# Command for executing most basic API request with JSON requests/responses
class ApiCommand < HttpCommand
JSON_CONTENT_TYPE = 'application/json'
FIELDS_PARAM = 'fields'
RATE_LIMIT_ERRORS = %w(rateLimitExceeded userRateLimitExceeded)
# JSON serializer for request objects
# @return [Google::Apis::Core::JsonRepresentation]
attr_accessor :request_representation
# Request body to serialize
# @return [Object]
attr_accessor :request_object
# JSON serializer for response objects
# @return [Google::Apis::Core::JsonRepresentation]
attr_accessor :response_representation
# Class to instantiate when de-serializing responses
# @return [Object]
attr_accessor :response_class
# Serialize the request body
#
# @return [void]
def prepare!
query[FIELDS_PARAM] = normalize_fields_param(query[FIELDS_PARAM]) if query.key?(FIELDS_PARAM)
if request_representation && request_object
header[:content_type] ||= JSON_CONTENT_TYPE
self.body = request_representation.new(request_object).to_json(skip_undefined: true)
end
super
end
# Deserialize the response body if present
#
# @param [String] content_type
# Content type of body
# @param [String, #read] body
# Response body
# @return [Object]
# Response object
# noinspection RubyUnusedLocalVariable
def decode_response_body(content_type, body)
return super unless response_representation
return super if content_type.nil?
return nil unless content_type.start_with?(JSON_CONTENT_TYPE)
instance = response_class.new
response_representation.new(instance).from_json(body, unwrap: response_class)
instance
end
# Check the response and raise error if needed
#
# @param [Fixnum] status
# HTTP status code of response
# @param [Hurley::Header] header
# HTTP response headers
# @param [String] body
# HTTP response body
# @param [String] message
# Error message text
# @return [void]
# @raise [Google::Apis::ServerError] An error occurred on the server and the request can be retried
# @raise [Google::Apis::ClientError] The request is invalid and should not be retried without modification
# @raise [Google::Apis::AuthorizationError] Authorization is required
def check_status(status, header = nil, body = nil, message = nil)
case status
when 400, 402...500
error = parse_error(body)
if error
message = sprintf('%s: %s', error['reason'], error['message'])
raise Google::Apis::RateLimitError.new(message,
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status_code: status,
header: header,
body: body) if RATE_LIMIT_ERRORS.include?(error['reason'])
end
super(status, header, body, message)
else
super(status, header, body, message)
end
end
private
# Attempt to parse a JSON error message, returning the first found error
# @param [String] body
# HTTP response body
# @return [Hash]
def parse_error(body)
hash = MultiJson.load(body)
hash['error']['errors'].first
rescue
nil
end
# Convert field names from ruby conventions to original names in JSON
#
# @param [String] fields
# Value of 'fields' param
# @return [String]
# Updated header value
def normalize_fields_param(fields)
# TODO: Generate map of parameter names during code gen. Small possibility that camelization fails
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fields.gsub(/:/, '').gsub(/\w+/) { |str| ActiveSupport::Inflector.camelize(str, false) }
end
end
end
end
end