[GitHub] [kafka] cmccabe commented on a diff in pull request #14306: KAFKA-15369: Implement KIP-919: Allow AC to Talk Directly with Controllers

["cmccabe (via GitHub)" <gi...@apache.org>]

cmccabe commented on code in PR #14306:
URL: https://github.com/apache/kafka/pull/14306#discussion_r1313363156


##########
core/src/main/scala/kafka/server/AuthHelper.scala:
##########
@@ -130,4 +134,57 @@ class AuthHelper(authorizer: Option[Authorizer]) {
     }
   }
 
+  def computeDescribeClusterResponse(
+    request: RequestChannel.Request,
+    expectedEndpointType: EndpointType,
+    clusterId: String,
+    getNodes: () => DescribeClusterBrokerCollection,
+    getControllerId: () => Int
+  ): DescribeClusterResponseData = {
+    val describeClusterRequest = request.body[DescribeClusterRequest]
+    val requestEndpointType = EndpointType.fromId(describeClusterRequest.data().endpointType())
+    if (requestEndpointType.equals(EndpointType.UNKNOWN)) {
+      return new DescribeClusterResponseData().
+        setErrorCode(if (request.header.data().requestApiVersion() == 0) {
+          Errors.INVALID_REQUEST.code()
+        } else {
+          Errors.UNSUPPORTED_ENDPOINT_TYPE.code()
+        }).
+        setErrorMessage("Unsupported endpoint type " + describeClusterRequest.data().endpointType().toInt)
+    } else if (!expectedEndpointType.equals(requestEndpointType)) {
+      return new DescribeClusterResponseData().
+        setErrorCode(if (request.header.data().requestApiVersion() == 0) {
+          Errors.INVALID_REQUEST.code()
+        } else {
+          Errors.MISMATCHED_ENDPOINT_TYPE.code()
+        }).
+        setErrorMessage("The request was sent to an endpoint of type " + expectedEndpointType +
+          ", but we wanted an endpoint of type " + requestEndpointType)
+    }

Review Comment:
   v0 of the schema has no place to put endpoint type. it simply cannot be serialized in the v0 encoding. doesn't matter what client or programming language you use.



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