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Merge branch 'dougforpres-auth-retry'

This commit is contained in:
Steven Bazyl 2014-12-17 12:40:15 -08:00
parent b9639ee11c 8e49ee764b
commit 0b4b24d06d
4 changed files with 121 additions and 25 deletions
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2
README.md
View File

@ -123,6 +123,8 @@ in the credentials. Detailed instructions on how to enable delegation for your d
The API client can automatically retry requests for recoverable errors. To enable retries, set the `client.retries` property to
the number of additional attempts. To avoid flooding servers, retries invovle a 1 second delay that increases on each subsequent retry.
In the case of authentication token expiry, the API client will attempt to refresh the token and retry the failed operation - this
is a specific exception to the retry rules.
The default value for retries is 0, but will be enabled by default in future releases.

76
lib/google/api_client.rb
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@ -118,6 +118,7 @@ module Google
self.key = options[:key]
self.user_ip = options[:user_ip]
self.retries = options.fetch(:retries) { 0 }
self.expired_auth_retry = options.fetch(:expired_auth_retry) { true }
@discovery_uris = {}
@discovery_documents = {}
@discovered_apis = {}
@ -255,6 +256,13 @@ module Google
# Number of retries
attr_accessor :retries
##
# Whether or not an expired auth token should be re-acquired
# (and the operation retried) regardless of retries setting
# @return [Boolean]
# Auto retry on auth expiry
attr_accessor :expired_auth_retry
##
# Returns the URI for the directory document.
#
@ -613,28 +621,40 @@ module Google
request.authorization = options[:authorization] || self.authorization unless options[:authenticated] == false
tries = 1 + (options[:retries] || self.retries)
attempt = 0
Retriable.retriable :tries => tries,
:on => [TransmissionError],
:on_retry => client_error_handler(request.authorization),
:on_retry => client_error_handler,
:interval => lambda {|attempts| (2 ** attempts) + rand} do
result = request.send(connection, true)
attempt += 1
case result.status
when 200...300
result
when 301, 302, 303, 307
request = generate_request(request.to_hash.merge({
:uri => result.headers['location'],
:api_method => nil
}))
raise RedirectError.new(result.headers['location'], result)
when 400...500
raise ClientError.new(result.error_message || "A client error has occurred", result)
when 500...600
raise ServerError.new(result.error_message || "A server error has occurred", result)
else
raise TransmissionError.new(result.error_message || "A transmission error has occurred", result)
# 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
Retriable.retriable :tries => ((expired_auth_retry || tries > 1) && attempt == 1) ? 2 : 1,
:on => [AuthorizationError],
:on_retry => authorization_error_handler(request.authorization) do
result = request.send(connection, true)
case result.status
when 200...300
result
when 301, 302, 303, 307
request = generate_request(request.to_hash.merge({
:uri => result.headers['location'],
:api_method => nil
}))
raise RedirectError.new(result.headers['location'], result)
when 401
raise AuthorizationError.new(result.error_message || 'Invalid/Expired Authentication', result)
when 400, 402...500
raise ClientError.new(result.error_message || "A client error has occurred", result)
when 500...600
raise ServerError.new(result.error_message || "A server error has occurred", result)
else
raise TransmissionError.new(result.error_message || "A transmission error has occurred", result)
end
end
end
end
@ -682,18 +702,17 @@ module Google
##
# Returns on proc for special processing of retries as not all client errors
# are recoverable. Only 401s should be retried and only if the credentials
# are refreshable
# Returns on proc for special processing of retries for authorization errors
# Only 401s should be retried and only if the credentials are refreshable
#
# @param [#fetch_access_token!] authorization
# OAuth 2 credentials
# @return [Proc]
def client_error_handler(authorization)
def authorization_error_handler(authorization)
can_refresh = authorization.respond_to?(:refresh_token) && auto_refresh_token
Proc.new do |exception, tries|
next unless exception.kind_of?(ClientError)
if exception.result.status == 401 && can_refresh && tries == 1
next unless exception.kind_of?(AuthorizationError)
if can_refresh
begin
logger.debug("Attempting refresh of access token & retry of request")
authorization.fetch_access_token!
@ -705,6 +724,17 @@ module Google
end
end
##
# Returns on proc for special processing of retries as not all client errors
# are recoverable. Only 401s should be retried (via authorization_error_handler)
#
# @return [Proc]
def client_error_handler
Proc.new do |exception, tries|
raise exception if exception.kind_of?(ClientError)
end
end
end
end

5
lib/google/api_client/errors.rb
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@ -43,6 +43,11 @@ module Google
class ClientError < TransmissionError
end
##
# A 401 HTTP error occurred.
class AuthorizationError < ClientError
end
##
# A 5xx class HTTP error occurred.
class ServerError < TransmissionError

61
spec/google/api_client_spec.rb
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@ -200,7 +200,7 @@ RSpec.describe Google::APIClient do
)
end
it 'should refresh tokens on 401 tokens' do
it 'should refresh tokens on 401 errors' do
client.authorization.access_token = '12345'
expect(client.authorization).to receive(:fetch_access_token!)
@ -290,4 +290,63 @@ RSpec.describe Google::APIClient do
end
end
describe 'when retries disabled and expired_auth_retry on (default)' do
before do
client.retries = 0
end
after do
@connection.verify
end
it 'should refresh tokens on 401 errors' do
client.authorization.access_token = '12345'
expect(client.authorization).to receive(:fetch_access_token!)
@connection = stub_connection do |stub|
stub.get('/foo') do |env|
[401, {}, '{}']
end
stub.get('/foo') do |env|
[200, {}, '{}']
end
end
client.execute(
:uri => 'https://www.gogole.com/foo',
:connection => @connection
)
end
end
describe 'when retries disabled and expired_auth_retry off' do
before do
client.retries = 0
client.expired_auth_retry = false
end
it 'should not refresh tokens on 401 errors' do
client.authorization.access_token = '12345'
expect(client.authorization).not_to receive(:fetch_access_token!)
@connection = stub_connection do |stub|
stub.get('/foo') do |env|
[401, {}, '{}']
end
stub.get('/foo') do |env|
[200, {}, '{}']
end
end
resp = client.execute(
:uri => 'https://www.gogole.com/foo',
:connection => @connection
)
expect(resp.response.status).to be == 401
end
end
end