439 lines
16 KiB
Ruby
439 lines
16 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 '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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begin
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require 'opencensus'
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OPENCENSUS_AVAILABLE = true
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rescue LoadError
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OPENCENSUS_AVAILABLE = false
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end
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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 [Hash]
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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 [HTTPClient]
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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 = Hash.new
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self.body = body
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self.query = {}
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self.params = {}
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@opencensus_span = nil
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end
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# Execute the command, retrying as necessary
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#
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# @param [HTTPClient] 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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opencensus_begin_span
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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, Signet::AuthorizationError, Signet::RemoteServerError, Signet::UnexpectedStatusError],
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on_retry: proc { |*| refresh_authorization } do
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execute_once(client).tap do |result|
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if block_given?
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yield result, nil
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end
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end
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end
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end
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rescue => e
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if block_given?
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yield nil, e
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else
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raise e
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end
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end
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ensure
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opencensus_end_span
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@http_res = nil
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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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normalize_unicode = true
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if options
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header.update(options.header) if options.header
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normalize_unicode = options.normalize_unicode
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end
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self.url = url.expand(params, nil, normalize_unicode) if url.is_a?(Addressable::Template)
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url.query_values = query.merge(url.query_values || {})
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if allow_form_encoding?
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@form_encoded = true
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self.body = Addressable::URI.form_encode(url.query_values(Array))
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self.header['Content-Type'] = 'application/x-www-form-urlencoded; charset=UTF-8'
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self.url.query_values = {}
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else
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@form_encoded = false
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end
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self.body = '' unless self.body
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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 [Hash] 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, header, body)
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decode_response_body(header['Content-Type'].first, 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
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# @param [Hash] 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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# 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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message ||= sprintf('Redirect to %s', header['Location'])
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raise Google::Apis::RedirectError.new(message, status_code: status, header: header, body: body)
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when 401
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message ||= 'Unauthorized'
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raise Google::Apis::AuthorizationError.new(message, status_code: status, header: header, body: body)
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when 429
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message ||= 'Rate limit exceeded'
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raise Google::Apis::RateLimitError.new(message, status_code: status, header: header, body: body)
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when 304, 400, 402...500
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message ||= 'Invalid request'
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raise Google::Apis::ClientError.new(message, status_code: status, header: header, body: body)
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when 500...600
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message ||= 'Server error'
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raise Google::Apis::ServerError.new(message, status_code: status, header: header, body: body)
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else
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logger.warn(sprintf('Encountered unexpected status code %s', status))
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message ||= 'Unknown error'
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raise Google::Apis::TransmissionError.new(message, status_code: status, header: header, body: 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', safe_object_representation(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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if err.is_a?(HTTPClient::BadResponseError)
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begin
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res = err.res
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raise Google::Apis::TransmissionError.new(err) if res.nil?
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check_status(res.status.to_i, res.header, res.body)
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rescue Google::Apis::Error => e
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err = e
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end
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elsif err.is_a?(HTTPClient::TimeoutError) || err.is_a?(SocketError)
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err = Google::Apis::TransmissionError.new(err)
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end
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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 [HTTPClient] client
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# HTTP client
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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)
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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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request_header = header.dup
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apply_request_options(request_header)
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@http_res = client.request(method.to_s.upcase,
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url.to_s,
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query: nil,
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body: body,
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header: request_header,
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follow_redirect: true)
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logger.debug { @http_res.status }
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logger.debug { safe_response_representation @http_res }
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response = process_response(@http_res.status.to_i, @http_res.header, @http_res.body)
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success(response)
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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)
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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 [Hash] header
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# HTTP headers
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# @return [void]
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def apply_request_options(req_header)
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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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end
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def allow_form_encoding?
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[:post, :put].include?(method) && body.nil?
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end
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private
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UNSAFE_CLASS_NAMES = [
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"Google::Apis::CloudkmsV1::DecryptResponse"
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]
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def safe_object_representation obj
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name = obj.class.name
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if UNSAFE_CLASS_NAMES.include? name
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"#<#{name} (fields redacted)>"
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else
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PP.pp(obj, "")
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end
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end
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def safe_response_representation http_res
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if respond_to?(:response_class) && response_class.is_a?(Class) &&
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UNSAFE_CLASS_NAMES.include?(response_class.name)
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return "#<#{http_res.class.name} (fields redacted)>"
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end
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http_res.inspect
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end
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def opencensus_begin_span
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return unless OPENCENSUS_AVAILABLE && options.use_opencensus
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return if @opencensus_span
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return unless OpenCensus::Trace.span_context
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@opencensus_span = OpenCensus::Trace.start_span url.path.to_s
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@opencensus_span.kind = OpenCensus::Trace::SpanBuilder::CLIENT
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@opencensus_span.put_attribute "http.host", url.host.to_s
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@opencensus_span.put_attribute "http.method", method.to_s.upcase
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@opencensus_span.put_attribute "http.path", url.path.to_s
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if body.respond_to? :bytesize
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@opencensus_span.put_message_event \
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OpenCensus::Trace::SpanBuilder::SENT, 1, body.bytesize
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end
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formatter = OpenCensus::Trace.config.http_formatter
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if formatter.respond_to? :header_name
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header[formatter.header_name] = formatter.serialize @opencensus_span.context.trace_context
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end
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rescue StandardError => e
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# Log exceptions and continue, so opencensus failures don't cause
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# the entire request to fail.
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logger.debug { sprintf('Error opening OpenCensus span: %s', e) }
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end
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def opencensus_end_span
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return unless OPENCENSUS_AVAILABLE
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return unless @opencensus_span
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return unless OpenCensus::Trace.span_context
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if @http_res.body.respond_to? :bytesize
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@opencensus_span.put_message_event \
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OpenCensus::Trace::SpanBuilder::RECEIVED, 1, @http_res.body.bytesize
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end
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status = @http_res.status.to_i
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if status > 0
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@opencensus_span.set_status map_http_status status
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@opencensus_span.put_attribute "http.status_code", status
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end
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OpenCensus::Trace.end_span @opencensus_span
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@opencensus_span = nil
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rescue StandardError => e
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# Log exceptions and continue, so failures don't cause leaks by
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# aborting cleanup.
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logger.debug { sprintf('Error finishing OpenCensus span: %s', e) }
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end
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def form_encoded?
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@form_encoded
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end
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def map_http_status http_status
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case http_status
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when 200..399 then 0 # OK
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when 400 then 3 # INVALID_ARGUMENT
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when 401 then 16 # UNAUTHENTICATED
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when 403 then 7 # PERMISSION_DENIED
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when 404 then 5 # NOT_FOUND
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when 429 then 8 # RESOURCE_EXHAUSTED
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when 501 then 12 # UNIMPLEMENTED
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when 503 then 14 # UNAVAILABLE
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when 504 then 4 # DEADLINE_EXCEEDED
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else 2 # UNKNOWN
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end
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end
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def normalize_query_value(v)
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case v
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when Array
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v.map { |v2| normalize_query_value(v2) }
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when nil
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nil
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else
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v.to_s
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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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