276 lines
9.8 KiB
Ruby
276 lines
9.8 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/options'
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require 'google/apis/errors'
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require 'retriable'
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require 'hurley'
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require 'hurley/addressable'
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require 'google/apis/core/logging'
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require 'pp'
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module Google
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module Apis
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module Core
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# Command for HTTP request/response.
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class HttpCommand
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include Logging
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RETRIABLE_ERRORS = [Google::Apis::ServerError, Google::Apis::RateLimitError, Google::Apis::TransmissionError]
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# Request options
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# @return [Google::Apis::RequestOptions]
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attr_accessor :options
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# HTTP request URL
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# @return [String, Addressable::URI]
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attr_accessor :url
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# HTTP headers
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# @return [Hurley::Header]
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attr_accessor :header
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# Request body
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# @return [#read]
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attr_accessor :body
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# HTTP method
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# @return [symbol]
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attr_accessor :method
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# HTTP Client
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# @return [Hurley::Client]
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attr_accessor :connection
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# Query params
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# @return [Hash]
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attr_accessor :query
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# Path params for URL Template
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# @return [Hash]
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attr_accessor :params
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# @param [symbol] method
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# HTTP method
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# @param [String,Addressable::URI, Addressable::Template] url
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# HTTP URL or template
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# @param [String, #read] body
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# Request body
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def initialize(method, url, body: nil)
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self.options = Google::Apis::RequestOptions.default.dup
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self.url = url
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self.url = Addressable::Template.new(url) if url.is_a?(String)
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self.method = method
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self.header = Hurley::Header.new
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self.body = body
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self.query = {}
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self.params = {}
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end
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# Execute the command, retrying as necessary
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#
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# @param [Hurley::Client] client
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# HTTP client
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# @yield [result, err] Result or error if block supplied
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# @return [Object]
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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 execute(client)
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prepare!
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proc = block_given? ? Proc.new : nil
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begin
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Retriable.retriable tries: options.retries + 1,
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base_interval: 1,
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multiplier: 2,
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on: RETRIABLE_ERRORS do |try|
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# This 2nd level retriable only catches auth errors, and supports 1 retry, which allows
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# auth to be re-attempted without having to retry all sorts of other failures like
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# NotFound, etc
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auth_tries = (try == 1 && authorization_refreshable? ? 2 : 1)
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Retriable.retriable tries: auth_tries,
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on: [Google::Apis::AuthorizationError],
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on_retry: proc { |*| refresh_authorization } do
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return execute_once(client, &proc)
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end
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end
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rescue => e
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raise e if proc.nil?
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end
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ensure
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release!
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end
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# Refresh the authorization authorization after a 401 error
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#
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# @private
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# @return [void]
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def refresh_authorization
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# Handled implicitly by auth lib, here in case need to override
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logger.debug('Retrying after authentication failure')
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end
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# Check if attached credentials can be automatically refreshed
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# @return [Boolean]
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def authorization_refreshable?
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options.authorization.respond_to?(:apply!)
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end
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# Prepare the request (e.g. calculate headers, serialize data, etc) before sending
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#
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# @private
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# @return [void]
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def prepare!
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header.update(options.header) if options && options.header
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self.url = url.expand(params) if url.is_a?(Addressable::Template)
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url.query_values = query
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end
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# Release any resources used by this command
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# @private
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# @return [void]
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def release!
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end
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# Check the response and either decode body or raise error
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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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# Response headers
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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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# @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 process_response(status, header, body)
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check_status(status, body)
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decode_response_body(header[:content_type], body)
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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 [String] body
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# HTTP response body
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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, body = nil)
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# TODO: 304 Not Modified depends on context...
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case status
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when 200...300
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nil
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when 301, 302, 303, 307
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fail Google::Apis::RedirectError, header[:location]
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when 401
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fail Google::Apis::AuthorizationError, body
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when 304, 400, 402...500
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fail Google::Apis::ClientError, body
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when 500...600
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fail Google::Apis::ServerError, body
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else
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logger.warn(sprintf('Encountered unexpected status code %s', status))
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fail Google::Apis::TransmissionError, body
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end
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end
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# Process the actual response body. Intended to be overridden by subclasses
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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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def decode_response_body(_content_type, body)
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body
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end
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# Process a success response
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# @param [Object] result
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# Result object
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# @return [Object] result if no block given
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# @yield [result, nil] if block given
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def success(result, &block)
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logger.debug { sprintf('Success - %s', PP.pp(result, '')) }
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block.call(result, nil) if block_given?
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result
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end
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# Process an error response
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# @param [StandardError] err
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# Error object
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# @param [Boolean] rethrow
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# True if error should be raised again after handling
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# @return [void]
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# @yield [nil, err] if block given
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# @raise [StandardError] if no block
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def error(err, rethrow: false, &block)
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logger.debug { sprintf('Error - %s', PP.pp(err, '')) }
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err = Google::Apis::TransmissionError.new(err) if err.is_a?(Hurley::ClientError)
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block.call(nil, err) if block_given?
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fail err if rethrow || block.nil?
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end
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# Execute the command once.
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#
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# @private
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# @param [Hurley::Client] client
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# HTTP client
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# @yield [result, err] Result or error if block supplied
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# @return [Object]
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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 execute_once(client, &block)
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body.rewind if body.respond_to?(:rewind)
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begin
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logger.debug { sprintf('Sending HTTP %s %s', method, url) }
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response = client.send(method, url, body) do |req|
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apply_request_options(req)
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end
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logger.debug { response.status_code }
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logger.debug { response.inspect }
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response = process_response(response.status_code, response.header, response.body)
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success(response, &block)
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rescue => e
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logger.debug { sprintf('Caught error %s', e) }
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error(e, rethrow: true, &block)
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end
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end
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# Update the request with any specified options.
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# @param [Hurley::Request] req
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# HTTP request
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# @return [void]
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def apply_request_options(req)
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if options.authorization.respond_to?(:apply!)
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options.authorization.apply!(req.header)
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elsif options.authorization.is_a?(String)
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req.header[:authorization] = sprintf('Bearer %s', options.authorization)
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end
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req.header.update(header)
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req.options.timeout = options.timeout_sec
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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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