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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-7551) Add VERSION to the REST urls.
Date Wed, 29 Aug 2018 21:06:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-7551?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16596857#comment-16596857
] 

ASF GitHub Bot commented on FLINK-7551:
---------------------------------------

tillrohrmann commented on a change in pull request #6602:  [FLINK-7551][rest] Add versioning
to REST API
URL: https://github.com/apache/flink/pull/6602#discussion_r213833987
 
 

 ##########
 File path: flink-runtime/src/main/java/org/apache/flink/runtime/rest/RestServerEndpoint.java
 ##########
 @@ -364,22 +364,37 @@ public String getRestBaseUrl() {
 		}
 	}
 
-	private static void registerHandler(Router router, Tuple2<RestHandlerSpecification, ChannelInboundHandler>
specificationHandler) {
-		switch (specificationHandler.f0.getHttpMethod()) {
+	private static void registerHandler(Router router, Tuple2<RestHandlerSpecification, ChannelInboundHandler>
specificationHandler, Logger log) {
+		final String handlerURL = specificationHandler.f0.getTargetRestEndpointURL();
+		// setup versioned urls
+		for (final RestAPIVersion supportedVersion : specificationHandler.f0.getSupportedAPIVersions())
{
+			final String versionedHandlerURL = '/' + supportedVersion.getURLVersionPrefix() + handlerURL;
+			log.debug("Register handler {} under {}@{}.", specificationHandler.f1, specificationHandler.f0.getHttpMethod(),
versionedHandlerURL);
+			registerHandler(router, versionedHandlerURL, specificationHandler.f0.getHttpMethod(),
specificationHandler.f1);
+		}
+		// setup unversioned url for convenience and backwards compatibility
+		// this url will always point to the oldest supported version
+		// this is controlled by the order in which handler are registered
+		log.debug("Register handler {} under {}@{}.", specificationHandler.f1, specificationHandler.f0.getHttpMethod(),
handlerURL);
+		registerHandler(router, handlerURL, specificationHandler.f0.getHttpMethod(), specificationHandler.f1);
 
 Review comment:
   Sounds like a good idea to me. Good catch @zentol!

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> Add VERSION to the REST urls. 
> ------------------------------
>
>                 Key: FLINK-7551
>                 URL: https://issues.apache.org/jira/browse/FLINK-7551
>             Project: Flink
>          Issue Type: Improvement
>          Components: REST
>    Affects Versions: 1.4.0
>            Reporter: Kostas Kloudas
>            Assignee: Chesnay Schepler
>            Priority: Critical
>              Labels: pull-request-available
>             Fix For: 1.7.0
>
>
> This is to guarantee that we can update the REST API without breaking existing third-party
clients.



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