313 lines
11 KiB
Ruby
313 lines
11 KiB
Ruby
# 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 'addressable/uri'
|
|
require 'addressable/template'
|
|
require 'google/apis/options'
|
|
require 'google/apis/errors'
|
|
require 'retriable'
|
|
require 'hurley'
|
|
require 'hurley/addressable'
|
|
require 'hurley_patches'
|
|
require 'google/apis/core/logging'
|
|
require 'pp'
|
|
|
|
module Google
|
|
module Apis
|
|
module Core
|
|
# Command for HTTP request/response.
|
|
class HttpCommand
|
|
include Logging
|
|
|
|
RETRIABLE_ERRORS = [Google::Apis::ServerError, Google::Apis::RateLimitError, Google::Apis::TransmissionError]
|
|
|
|
# Request options
|
|
# @return [Google::Apis::RequestOptions]
|
|
attr_accessor :options
|
|
|
|
# HTTP request URL
|
|
# @return [String, Addressable::URI]
|
|
attr_accessor :url
|
|
|
|
# HTTP headers
|
|
# @return [Hurley::Header]
|
|
attr_accessor :header
|
|
|
|
# Request body
|
|
# @return [#read]
|
|
attr_accessor :body
|
|
|
|
# HTTP method
|
|
# @return [symbol]
|
|
attr_accessor :method
|
|
|
|
# HTTP Client
|
|
# @return [Hurley::Client]
|
|
attr_accessor :connection
|
|
|
|
# Query params
|
|
# @return [Hash]
|
|
attr_accessor :query
|
|
|
|
# Path params for URL Template
|
|
# @return [Hash]
|
|
attr_accessor :params
|
|
|
|
# @param [symbol] method
|
|
# HTTP method
|
|
# @param [String,Addressable::URI, Addressable::Template] url
|
|
# HTTP URL or template
|
|
# @param [String, #read] body
|
|
# Request body
|
|
def initialize(method, url, body: nil)
|
|
self.options = Google::Apis::RequestOptions.default.dup
|
|
self.url = url
|
|
self.url = Addressable::Template.new(url) if url.is_a?(String)
|
|
self.method = method
|
|
self.header = Hurley::Header.new
|
|
self.body = body
|
|
self.query = {}
|
|
self.params = {}
|
|
end
|
|
|
|
# Execute the command, retrying as necessary
|
|
#
|
|
# @param [Hurley::Client] client
|
|
# HTTP client
|
|
# @yield [result, err] Result or error if block supplied
|
|
# @return [Object]
|
|
# @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 execute(client)
|
|
prepare!
|
|
begin
|
|
Retriable.retriable tries: options.retries + 1,
|
|
base_interval: 1,
|
|
multiplier: 2,
|
|
on: RETRIABLE_ERRORS do |try|
|
|
# This 2nd level retriable only catches auth errors, and supports 1 retry, which allows
|
|
# auth to be re-attempted without having to retry all sorts of other failures like
|
|
# NotFound, etc
|
|
auth_tries = (try == 1 && authorization_refreshable? ? 2 : 1)
|
|
Retriable.retriable tries: auth_tries,
|
|
on: [Google::Apis::AuthorizationError],
|
|
on_retry: proc { |*| refresh_authorization } do
|
|
execute_once(client).tap do |result|
|
|
if block_given?
|
|
yield result, nil
|
|
end
|
|
end
|
|
end
|
|
end
|
|
rescue => e
|
|
if block_given?
|
|
yield nil, e
|
|
else
|
|
raise e
|
|
end
|
|
end
|
|
ensure
|
|
release!
|
|
end
|
|
|
|
# Refresh the authorization authorization after a 401 error
|
|
#
|
|
# @private
|
|
# @return [void]
|
|
def refresh_authorization
|
|
# Handled implicitly by auth lib, here in case need to override
|
|
logger.debug('Retrying after authentication failure')
|
|
end
|
|
|
|
# Check if attached credentials can be automatically refreshed
|
|
# @return [Boolean]
|
|
def authorization_refreshable?
|
|
options.authorization.respond_to?(:apply!)
|
|
end
|
|
|
|
# Prepare the request (e.g. calculate headers, serialize data, etc) before sending
|
|
#
|
|
# @private
|
|
# @return [void]
|
|
def prepare!
|
|
header.update(options.header) if options && options.header
|
|
self.url = url.expand(params) if url.is_a?(Addressable::Template)
|
|
url.query_values = query.merge(url.query_values || {})
|
|
end
|
|
|
|
# Release any resources used by this command
|
|
# @private
|
|
# @return [void]
|
|
def release!
|
|
end
|
|
|
|
# Check the response and either decode body or raise error
|
|
#
|
|
# @param [Fixnum] status
|
|
# HTTP status code of response
|
|
# @param [Hurley::Header] header
|
|
# Response headers
|
|
# @param [String, #read] body
|
|
# Response body
|
|
# @return [Object]
|
|
# Response object
|
|
# @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 process_response(status, header, body)
|
|
check_status(status, header, body)
|
|
decode_response_body(header[:content_type], body)
|
|
end
|
|
|
|
# Check the response and raise error if needed
|
|
#
|
|
# @param [Fixnum] status
|
|
# HTTP status code of response
|
|
# @param
|
|
# @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)
|
|
# TODO: 304 Not Modified depends on context...
|
|
case status
|
|
when 200...300
|
|
nil
|
|
when 301, 302, 303, 307
|
|
message ||= sprintf('Redirect to %s', header[:location])
|
|
raise Google::Apis::RedirectError.new(message, status_code: status, header: header, body: body)
|
|
when 401
|
|
message ||= 'Unauthorized'
|
|
raise Google::Apis::AuthorizationError.new(message, status_code: status, header: header, body: body)
|
|
when 304, 400, 402...500
|
|
message ||= 'Invalid request'
|
|
raise Google::Apis::ClientError.new(message, status_code: status, header: header, body: body)
|
|
when 500...600
|
|
message ||= 'Server error'
|
|
raise Google::Apis::ServerError.new(message, status_code: status, header: header, body: body)
|
|
else
|
|
logger.warn(sprintf('Encountered unexpected status code %s', status))
|
|
message ||= 'Unknown error'
|
|
raise Google::Apis::TransmissionError.new(message, status_code: status, header: header, body: body)
|
|
end
|
|
end
|
|
|
|
# Process the actual response body. Intended to be overridden by subclasses
|
|
#
|
|
# @param [String] _content_type
|
|
# Content type of body
|
|
# @param [String, #read] body
|
|
# Response body
|
|
# @return [Object]
|
|
def decode_response_body(_content_type, body)
|
|
body
|
|
end
|
|
|
|
# Process a success response
|
|
# @param [Object] result
|
|
# Result object
|
|
# @return [Object] result if no block given
|
|
# @yield [result, nil] if block given
|
|
def success(result, &block)
|
|
logger.debug { sprintf('Success - %s', PP.pp(result, '')) }
|
|
block.call(result, nil) if block_given?
|
|
result
|
|
end
|
|
|
|
# Process an error response
|
|
# @param [StandardError] err
|
|
# Error object
|
|
# @param [Boolean] rethrow
|
|
# True if error should be raised again after handling
|
|
# @return [void]
|
|
# @yield [nil, err] if block given
|
|
# @raise [StandardError] if no block
|
|
def error(err, rethrow: false, &block)
|
|
logger.debug { sprintf('Error - %s', PP.pp(err, '')) }
|
|
err = Google::Apis::TransmissionError.new(err) if err.is_a?(Hurley::ClientError)
|
|
block.call(nil, err) if block_given?
|
|
fail err if rethrow || block.nil?
|
|
end
|
|
|
|
# Execute the command once.
|
|
#
|
|
# @private
|
|
# @param [Hurley::Client] client
|
|
# HTTP client
|
|
# @return [Object]
|
|
# @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 execute_once(client)
|
|
body.rewind if body.respond_to?(:rewind)
|
|
begin
|
|
logger.debug { sprintf('Sending HTTP %s %s', method, url) }
|
|
response = client.send(method, url, body) do |req|
|
|
# Temporary workaround for Hurley bug where the connection preference
|
|
# is ignored and it uses nested anyway
|
|
req.url.query_class = Hurley::Query::Flat
|
|
query.each do | k, v|
|
|
req.url.query[k] = normalize_query_value(v)
|
|
end
|
|
# End workaround
|
|
apply_request_options(req)
|
|
end
|
|
logger.debug { response.status_code }
|
|
logger.debug { response.inspect }
|
|
response = process_response(response.status_code, response.header, response.body)
|
|
success(response)
|
|
rescue => e
|
|
logger.debug { sprintf('Caught error %s', e) }
|
|
error(e, rethrow: true)
|
|
end
|
|
end
|
|
|
|
# Update the request with any specified options.
|
|
# @param [Hurley::Request] req
|
|
# HTTP request
|
|
# @return [void]
|
|
def apply_request_options(req)
|
|
if options.authorization.respond_to?(:apply!)
|
|
options.authorization.apply!(req.header)
|
|
elsif options.authorization.is_a?(String)
|
|
req.header[:authorization] = sprintf('Bearer %s', options.authorization)
|
|
end
|
|
req.header.update(header)
|
|
req.options.timeout = options.timeout_sec
|
|
end
|
|
|
|
private
|
|
|
|
def normalize_query_value(v)
|
|
case v
|
|
when Array
|
|
v.map { |v2| normalize_query_value(v2) }
|
|
when nil
|
|
nil
|
|
else
|
|
v.to_s
|
|
end
|
|
end
|
|
end
|
|
end
|
|
end
|
|
end
|