object ThriftMuxResponseClassifier
ResponseClassifiers
for use with finagle-thriftmux
request/responses.
Thrift (and ThriftMux) services are a bit unusual in that
there is only a single com.twitter.finagle.Service
from Array[Byte]
to Array[Byte]
for all the methods of an IDL's service.
ThriftMux classifiers should be written in terms
of the Scrooge generated request $Service.$Method.Args
type and the
method's response type. This is because there is support in Scrooge
and ThriftMux.newService/newClient
to deserialize the responses into the expected application types
so that classifiers can be written in a normal way.
Given an idl:
exception NotFoundException { 1: string reason } exception RateLimitedException { 1: string reason } service SocialGraph { i32 follow(1: i64 follower, 2: i64 followee) throws ( 1: NotFoundException ex, 2: RateLimitedException ex ) }
One possible custom classifier would be:
val classifier: ResponseClassifier = { case ReqRep(_, Throw(_: RateLimitedException)) => RetryableFailure case ReqRep(_, Throw(_: NotFoundException)) => NonRetryableFailure case ReqRep(_, Return(x: Int)) if x == 0 => NonRetryableFailure case ReqRep(SocialGraph.Follow.Args(a, b), _) if a <= 0 || b <= 0 => NonRetryableFailure }
Often times, a good default classifier is ThriftMuxResponseClassifier.ThriftExceptionsAsFailures which treats any Thrift response that deserializes into an Exception as a non-retryable failure.
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- val ThriftExceptionsAsFailures: ResponseClassifier
Categorizes responses where the deserialized response is a Thrift Exception as a
ResponseClass.NonRetryableFailure
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