137 lines
4.9 KiB
Ruby
137 lines
4.9 KiB
Ruby
# Copyright 2015 Google Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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require 'addressable/uri'
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require 'addressable/template'
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require 'google/apis/core/http_command'
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require 'google/apis/errors'
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require 'json'
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require 'retriable'
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module Google
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module Apis
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module Core
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# Command for executing most basic API request with JSON requests/responses
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class ApiCommand < HttpCommand
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JSON_CONTENT_TYPE = 'application/json'
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FIELDS_PARAM = 'fields'
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RATE_LIMIT_ERRORS = %w(rateLimitExceeded userRateLimitExceeded)
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# JSON serializer for request objects
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# @return [Google::Apis::Core::JsonRepresentation]
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attr_accessor :request_representation
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# Request body to serialize
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# @return [Object]
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attr_accessor :request_object
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# JSON serializer for response objects
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# @return [Google::Apis::Core::JsonRepresentation]
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attr_accessor :response_representation
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# Class to instantiate when de-serializing responses
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# @return [Object]
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attr_accessor :response_class
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# Serialize the request body
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#
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# @return [void]
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def prepare!
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query[FIELDS_PARAM] = normalize_fields_param(query[FIELDS_PARAM]) if query.key?(FIELDS_PARAM)
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if request_representation && request_object
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header[:content_type] ||= JSON_CONTENT_TYPE
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self.body = request_representation.new(request_object).to_json(skip_undefined: true)
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end
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super
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end
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# Deserialize the response body if present
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#
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# @param [String] content_type
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# Content type of body
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# @param [String, #read] body
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# Response body
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# @return [Object]
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# Response object
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# noinspection RubyUnusedLocalVariable
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def decode_response_body(content_type, body)
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return super unless response_representation
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return super if content_type.nil?
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return nil unless content_type.start_with?(JSON_CONTENT_TYPE)
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instance = response_class.new
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response_representation.new(instance).from_json(body, unwrap: response_class)
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instance
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end
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# Check the response and raise error if needed
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#
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# @param [Fixnum] status
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# HTTP status code of response
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# @param [Hurley::Header] header
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# HTTP response headers
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# @param [String] body
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# HTTP response body
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# @param [String] message
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# Error message text
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# @return [void]
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# @raise [Google::Apis::ServerError] An error occurred on the server and the request can be retried
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# @raise [Google::Apis::ClientError] The request is invalid and should not be retried without modification
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# @raise [Google::Apis::AuthorizationError] Authorization is required
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def check_status(status, header = nil, body = nil, message = nil)
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case status
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when 400, 402...500
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error = parse_error(body)
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if error
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message = sprintf('%s: %s', error['reason'], error['message'])
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raise Google::Apis::RateLimitError.new(message,
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status_code: status,
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header: header,
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body: body) if RATE_LIMIT_ERRORS.include?(error['reason'])
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end
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super(status, header, body, message)
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else
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super(status, header, body, message)
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end
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end
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private
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# Attempt to parse a JSON error message, returning the first found error
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# @param [String] body
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# HTTP response body
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# @return [Hash]
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def parse_error(body)
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hash = JSON.load(body)
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hash['error']['errors'].first
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rescue
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nil
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end
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# Convert field names from ruby conventions to original names in JSON
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#
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# @param [String] fields
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# Value of 'fields' param
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# @return [String]
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# Updated header value
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def normalize_fields_param(fields)
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# TODO: Generate map of parameter names during code gen. Small possibility that camelization fails
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fields.gsub(/:/, '').gsub(/\w+/) do |str|
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str.gsub(/(?:^|_)([a-z])/){ Regexp.last_match.begin(0) == 0 ? $1 : $1.upcase }
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end
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end
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end
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end
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end
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end
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