xds: Add ExtAuthzClientInterceptor and call buffering#12897
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Part 3 of the client-side ext_authz filter. Sits on top of the response handling PR. Introduces the ClientInterceptor that performs async ext_authz checks on outgoing RPCs. Because the authorization call is asynchronous, outgoing sendMessage() and halfClose() frames are buffered in ExtAuthzClientCall until a decision arrives. On allow, buffered operations are replayed with any header mutations applied. On deny, the call is terminated immediately. Key classes: - AuthzCallbackObserver — async listener on the authz gRPC stream that signals the buffering call on completion. - ExtAuthzClientCall — buffers outgoing frames while authz is pending; drains or cancels based on the decision. - MutatingClientCall — wraps the real call to inject header mutations from the authz response. - FailingClientCall / FailingCallWithTrailerMutations — immediate termination paths for denied or disabled-filter scenarios.
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Part 3 of the client-side ext_authz filter. Sits on top of the response handling PR.
Introduces the ClientInterceptor that performs async ext_authz checks on outgoing RPCs. Because the authorization call is asynchronous, outgoing sendMessage() and halfClose() frames are buffered in ExtAuthzClientCall until a decision arrives. On allow, buffered operations are replayed with any header mutations applied. On deny, the call is terminated immediately.
Key classes: