[ISSUE #453] OpenSchema integration with EventMesh #434

yzhao244 · 2021-07-13T17:49:56Z

Fixes to child ISSUE#453 of its parent ISSUE#339.

Motivation

Support Schema Registry feature in EventMesh by integrating with OpenSchema Specifications

Explain why you want to make the changes and what problem you're trying to solve.

The purpose of this pull request is for introducing Schema Registry as part of the EventMesh.
The Schema Registry is a central repository with RESTful interfaces for developers to define and register standard schemas. Addresses the problem of inconsistent or incompatible data(event) format between event producer and event consumer.

Modifications

Added eventmesh-store-api module which is an abstract layer abstracts the CRUD capability of the schema registry into this module.
Added eventmesh-store-h2 module which contains the actual implementation
Modified eventmesh-runtime which exposes three new subject APIs (schemaregistry/createSubject, /schemaregistry/readSubjectByName and /schemaregistry/showAllSubjectNames) via ClientManageController.

Documentation

Does this pull request introduce a new feature? yes
If yes, how is the feature documented? Another follow up issue or PR will be created for adding the documentation
If a feature is not applicable for documentation, explain why?
If a feature is not documented yet in this PR, please create a followup issue for adding the documentation

github-actions

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yzhao244 · 2021-07-13T17:52:45Z

POST http://localhost:10106/schemaregistry/createSubject
The following is the payload of creating a new subject

{
	"subject": "test-topic",
	"namespace": "org.apache.rocketmq",
	"tenant": "messaging/rocketmq",
	"app": "rocketmq",
	"description": "rocketmq user information",
	"compatibility": "NONE",
	"status": "deprecated"
}

As shown above, the above APIs are not very closely following best practice of REST APIs. Therefore, I have proposed in the issue #339 to restify the EventMesh Schema Registry APIs by adding a new module.

codecov-commenter · 2021-07-14T01:27:42Z

Codecov Report

Merging #434 (d490f04) into develop (d8ac875) will decrease coverage by 0.11%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             develop    #434      +/-   ##
============================================
- Coverage       8.49%   8.38%   -0.12%     
  Complexity       256     256              
============================================
  Files            228     231       +3     
  Lines          10783   10930     +147     
  Branches         918     932      +14     
============================================
  Hits             916     916              
- Misses          9793    9940     +147     
  Partials          74      74

Impacted Files	Coverage Δ
...ntime/admin/controller/ClientManageController.java	`0.00% <0.00%> (ø)`
...sh/runtime/admin/handler/CreateSubjectHandler.java	`0.00% <0.00%> (ø)`
...untime/admin/handler/ReadSubjectByNameHandler.java	`0.00% <0.00%> (ø)`
...time/admin/handler/ShowAllSubjectNamesHandler.java	`0.00% <0.00%> (ø)`
...apache/eventmesh/runtime/boot/EventMeshServer.java	`0.00% <0.00%> (ø)`
...ventmesh/runtime/constants/EventMeshConstants.java	`0.00% <ø> (ø)`
...va/org/apache/eventmesh/runtime/util/NetUtils.java	`9.67% <0.00%> (-2.83%)`	⬇️

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update d8ac875...d490f04. Read the comment docs.

qqeasonchen · 2021-07-14T03:43:00Z

@yzhao244 License check seems failed.

ruanwenjun · 2021-07-14T11:59:53Z

@yzhao244 It might be better to add a new module such like eventmesh-store-plugin, and make the eventmesh-store-h2 as a submodule of eventmesh-store-plugin, this makes it easier to manage plugins.

And we have recently enhanced the SPI module #419, you can use EventMeshExtensionFactory.getExtension(Class<T> extensionType, String extensionName) to get plugin instance rather than using ServiceLoader. You can find some detail of SPI in eventmesh-connector-rocketmq module.

qqeasonchen · 2021-07-14T12:24:32Z

@yzhao244 It might be better to add a new module such like eventmesh-store-plugin, and make the eventmesh-store-h2 as a submodule of eventmesh-store-plugin, this makes it easier to manage plugins.

And we have recently enhanced the SPI module #419, you can use EventMeshExtensionFactory.getExtension(Class<T> extensionType, String extensionName) to get plugin instance rather than using ServiceLoader. You can find some detail of SPI in eventmesh-connector-rocketmq module.

yes, @ruanwenjun It seems also needs a eventmesh-connector-plugin moudle.

ruanwenjun · 2021-07-14T12:28:17Z

eventmesh-runtime/build.gradle

@@ -29,8 +29,12 @@ List open_message = [
        "io.openmessaging:openmessaging-api:2.2.1-pubsub"
 ]

+List h2_database = [


This dependency should move to eventmesh-store-h2.

ruanwenjun · 2021-07-14T12:29:27Z

...time/src/main/java/org/apache/eventmesh/runtime/admin/controller/ClientManageController.java

@@ -57,6 +60,10 @@ public void start() throws IOException {
        server.createContext("/clientManage/redirectClientByPath", new RedirectClientByPathHandler(eventMeshTCPServer));
        server.createContext("/clientManage/redirectClientByIpPort", new RedirectClientByIpPortHandler(eventMeshTCPServer));
        server.createContext("/clientManage/showListenClientByTopic", new ShowListenClientByTopicHandler(eventMeshTCPServer));
+
+        server.createContext("/schemaregistry/createSubject", new CreateSubjectHandler());


schemaregistry should rename to schemaRegistry

ruanwenjun · 2021-07-14T12:31:15Z

...h-runtime/src/main/java/org/apache/eventmesh/runtime/admin/handler/CreateSubjectHandler.java

@@ -0,0 +1,94 @@
+package org.apache.eventmesh.runtime.admin.handler;


Add license header here.

fixed license header

ruanwenjun · 2021-07-14T12:32:38Z

...h-runtime/src/main/java/org/apache/eventmesh/runtime/admin/handler/CreateSubjectHandler.java

+
+	private Logger logger = LoggerFactory.getLogger(CreateSubjectHandler.class);
+
+	private static ObjectMapper jsonMapper;


It might be better use JsonUtils to serialize or deserialize JSON.

@ruanwenjun just to confirm :) .. do you mean by creating a new utility class called "JsonUtils" under path (org.apache.eventmesh.runtime.util) which leverages ObjectMapper for JSON serialization or deserialization?

Maybe it can be placed at common module

ruanwenjun · 2021-07-14T12:35:36Z

...h-runtime/src/main/java/org/apache/eventmesh/runtime/admin/handler/CreateSubjectHandler.java

+            logger.error(result);
+            out.write(result.getBytes());
+            return;
+        } finally {


Use try with resource instead of try finally

In catch block, out.write(result.getBytes()); is used to return error response.. Therefore, out.write(result.getBytes()) becomes undefined if defining "OutputStream out" using Try with resource

ruanwenjun · 2021-07-14T12:52:12Z

...api/src/main/java/org/apache/eventmesh/store/api/openschema/request/ConfigUpdateRequest.java

+
+	  private String compatibilityLevel;
+
+	 /* @ApiModelProperty(value = "Compatability Level",


Remove unused code.

ruanwenjun · 2021-07-14T12:54:17Z

...api/src/main/java/org/apache/eventmesh/store/api/openschema/request/ConfigUpdateRequest.java

+	 /* @ApiModelProperty(value = "Compatability Level",
+	      allowableValues = "BACKWARD, BACKWARD_TRANSITIVE, FORWARD, FORWARD_TRANSITIVE, FULL, "
+	          + "FULL_TRANSITIVE, NONE")*/
+	  @JsonProperty("compatibility")


It might make confusion why the returned attribute don't match.

ruanwenjun · 2021-07-14T12:54:57Z

...api/src/main/java/org/apache/eventmesh/store/api/openschema/request/SchemaCreateRequest.java

+	  private String version;	   
+
+	  @JsonCreator
+	  public SchemaCreateRequest(@JsonProperty("name") String name,


Remove @JsonCreator and @JsonProperty

ruanwenjun · 2021-07-14T12:58:38Z

...h-store-api/src/main/java/org/apache/eventmesh/store/api/openschema/request/BaseRequest.java

+
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+public class BaseRequest {


The request might implement Serializable

ruanwenjun · 2021-07-14T13:04:02Z

eventmesh-store-h2/src/main/java/org/apache/eventmesh/store/h2/schema/util/DBDataSource.java

+
+    }
+
+    public static synchronized DBDataSource createDataSource(DBConfiguration dbConfig) {


The DBDataSource is singleton?

Yes, DBDataSource is singleton. Basically, it performs init, start and shutdown as part of EventMeshServer init, start and shutdown process.

But when we execute createDataSource method twice, we will get two DBDataSource instances, this is confusion, I think you would better make this class to be a real singleton.

You are right. I pushed fixes to DBDataSource class. thx

ruanwenjun · 2021-07-14T14:00:08Z

@qqeasonchen You are right, the eventmesh-connector-plugin is at this pr #433

yzhao244 · 2021-07-14T20:20:41Z

@qqeasonchen @ruanwenjun Thanks a lot for the review comments. I will start to address them :)

Jackzeng1224 · 2021-07-16T02:45:11Z

Hello, @yzhao244 ! I looked interface at the development, it seems that some interfaces are missing. I refer to https://github.com/openmessaging/openschema/blob/master/spec.md
for instance:
7.1.2
7.2.4
7.2.6
7.2.7

…addressed other review comments

yzhao244 · 2021-07-16T05:23:23Z

Hello, @yzhao244 ! I looked interface at the development, it seems that some interfaces are missing. I refer to https://github.com/openmessaging/openschema/blob/master/spec.md
for instance:
7.1.2
7.2.4
7.2.6
7.2.7

@Jackzeng1224 Thanks for the question. Yes, you are right. The current commit so far only contains three Subject related APIs such as create subject, readySubjectbyname and showAllSubjects which have been mentioned in my first comment of this PR. :) . However, I am going to implement the rest of missing interfaces as soon as we are okay with the new modules(eventmesh-store-api and eventmesh-store-plugin), because I can follow new modules standards to code/implement the rest of interfaces. lol

yzhao244 · 2021-07-16T05:39:30Z

@yzhao244 It might be better to add a new module such like eventmesh-store-plugin, and make the eventmesh-store-h2 as a submodule of eventmesh-store-plugin, this makes it easier to manage plugins.

And we have recently enhanced the SPI module #419, you can use EventMeshExtensionFactory.getExtension(Class<T> extensionType, String extensionName) to get plugin instance rather than using ServiceLoader. You can find some detail of SPI in eventmesh-connector-rocketmq module.

@ruanwenjun Thanks for the suggestion. I have made eventmesh-store-h2 as a submodule of eventmesh-store-plugin module and enhanced my implementation by using EventMeshExtensionFactory.getExtension instead of ServiceLoader. :)

Jackzeng1224 · 2021-07-16T07:18:28Z

Hello, @yzhao244 ! I looked interface at the development, it seems that some interfaces are missing. I refer to https://github.com/openmessaging/openschema/blob/master/spec.md
for instance:
7.1.2
7.2.4
7.2.6
7.2.7

@Jackzeng1224 Thanks for the question. Yes, you are right. The current commit so far only contains three Subject related APIs such as create subject, readySubjectbyname and showAllSubjects which have been mentioned in my first comment of this PR. :) . However, I am going to implement the rest of missing interfaces as soon as we are okay with the new modules(eventmesh-store-api and eventmesh-store-plugin), because I can follow new modules standards to code/implement the rest of interfaces. lol

Thanks for answering questions! Looking forward to eventmesh-store-plugin module

Jackzeng1224 · 2021-07-16T07:42:55Z

@yzhao244 hello，I found a problem with createDataSource. First, the new H2SchemaAdapter is initialized.

DBDataSource.createDataSource(dbConfig) in the start() method.
There should be a problem with the createDataSource() method. For example: ds, new DBDataSource(). It is different from other methods of creating data sources.

Jackzeng1224 · 2021-07-19T06:18:42Z

@yzhao244 hello,I looked at DBDataSource(), this "ds" does not belong to the object. Did you look right?

yzhao244 · 2021-07-19T15:38:32Z

@yzhao244 hello,I looked at DBDataSource(), this "ds" does not belong to the object. Did you look right?

You are right, I removed "static" when defining BasicDataSource ds.

Jackzeng1224 · 2021-07-20T01:56:29Z

@yzhao244 hello,I looked at DBDataSource(), this "ds" does not belong to the object. Did you look right?

You are right, I removed "static" when defining BasicDataSource ds.
Thanks! I will try again

yzhao244 · 2021-07-21T02:39:09Z

@qqeasonchen @ruanwenjun Hi guys, do you have any concerns before merging this PR? Please let me know if I missed anything here. :)

ruanwenjun · 2021-07-21T06:35:02Z

@qqeasonchen @ruanwenjun Hi guys, do you have any concerns before merging this PR? Please let me know if I missed anything here. :)

@yzhao244 Hi, I have a question, the h2 is a memory database, it seems doesn't support distributed, how can the different eventmesh-runtime sync the schema change?

qqeasonchen · 2021-07-21T06:57:09Z

@qqeasonchen @ruanwenjun Hi guys, do you have any concerns before merging this PR? Please let me know if I missed anything here. :)

@yzhao244 Hi, I have a question, the h2 is a memory database, it seems doesn't support distributed, how can the different eventmesh-runtime sync the schema change?

@qqeasonchen @ruanwenjun Hi guys, do you have any concerns before merging this PR? Please let me know if I missed anything here. :)

Eventmesh-store-api can be moved into eventmesh-store-plugin, just like connector.
Did all the apis in the openSchema implement now?
Did the management apis implement now?
Did the sdk implement now?

Jackzeng1224 · 2021-07-21T09:29:36Z

@yzhao244 hello,this problem occurs with the new receiving code. "configurationWraper" or "configurationWrapper"?

resolve build issue

yzhao244 · 2021-07-21T17:30:16Z

@qqeasonchen @ruanwenjun Hi guys, do you have any concerns before merging this PR? Please let me know if I missed anything here. :)

@yzhao244 Hi, I have a question, the h2 is a memory database, it seems doesn't support distributed, how can the different eventmesh-runtime sync the schema change?

@qqeasonchen @ruanwenjun Hi guys, do you have any concerns before merging this PR? Please let me know if I missed anything here. :)

@qqeasonchen I answered your questions below. :)

Eventmesh-store-api can be moved into eventmesh-store-plugin, just like connector.
Yes, I have pushed my latest changes which moved Eventmesh-store-api to be under eventmesh-store-plugin.
Did all the apis in the openSchema implement now?
Not yet, I am thinking it is better delivering OpenSchema Integration in an incremental delivery fashion. :) .. In total, OpenSchema APIs can be seen as three groups.. /subject/ related APIs, /schema/ related APIs, /config/compatibility related APIs which I would suggest to deliver each group by individually separated PRs. The PR 434 currently delivers /subject/ related APIs.
Three child issues are Implement OpenSchema Subject APIs #453
, Implement OpenSchema Schema APIs #454, Implement OpenSchema Compatibility APIs #455
Did the management apis implement now?
Three new subject APIs (schemaregistry/createSubject, /schemaregistry/readSubjectByName and /schemaregistry/showAllSubjectNames) via ClientManageController. The rest of the OpenSchema APIs will be tracked/implemented by individually separated issues and PRs
Did the sdk implement now?
Sorry, do you mean by eventmesh-sdk-java? All OpenSchema APIs are exposed as a RESTful API via webhook in ClientManageController.

yzhao244 · 2021-07-21T17:41:40Z

@qqeasonchen @ruanwenjun Hi guys, do you have any concerns before merging this PR? Please let me know if I missed anything here. :)

@yzhao244 Hi, I have a question, the h2 is a memory database, it seems doesn't support distributed, how can the different eventmesh-runtime sync the schema change?

very good question.. Actually, h2 can be turned into a persistent database by using the following example configuration (datasource.url=jdbc:h2:file:~/subdirectory/demodb) which persists data in file system.
Additionally, database configuration/url can be easily changed to point to any MySQL database service as an example based on end-user's choice for different eventmesh-runtime instances to sync the schema change. I am thinking to create separate issue for tracking documentation works for OpenSchema Integration and h2 plugin module.

qqeasonchen · 2021-07-22T08:52:59Z

@qqeasonchen @ruanwenjun Hi guys, do you have any concerns before merging this PR? Please let me know if I missed anything here. :)

@yzhao244 Hi, I have a question, the h2 is a memory database, it seems doesn't support distributed, how can the different eventmesh-runtime sync the schema change?

@qqeasonchen @ruanwenjun Hi guys, do you have any concerns before merging this PR? Please let me know if I missed anything here. :)

@qqeasonchen I answered your questions below. :)

Eventmesh-store-api can be moved into eventmesh-store-plugin, just like connector.
Yes, I have pushed my latest changes which moved Eventmesh-store-api to be under eventmesh-store-plugin.

Did all the apis in the openSchema implement now?
Not yet, I am thinking it is better delivering OpenSchema Integration in an incremental delivery fashion. :) .. In total, OpenSchema APIs can be seen as three groups.. /subject/ related APIs, /schema/ related APIs, /config/compatibility related APIs which I would suggest to deliver each group by individually separated PRs. The PR 434 currently delivers /subject/ related APIs.
Three child issues are Implement OpenSchema Subject APIs #453
, Implement OpenSchema Schema APIs #454, Implement OpenSchema Compatibility APIs #455

Did the management apis implement now?
Three new subject APIs (schemaregistry/createSubject, /schemaregistry/readSubjectByName and /schemaregistry/showAllSubjectNames) via ClientManageController. The rest of the OpenSchema APIs will be tracked/implemented by individually separated issues and PRs

Did the sdk implement now?
Sorry, do you mean by eventmesh-sdk-java? All OpenSchema APIs are exposed as a RESTful API via webhook in ClientManageController.

@yzhao244 Individually separated PRs is good for me. But it is not very clear about how to use schema when pub/sub events, it seems eventmesh provides a management service for schema only in the request implementations, am i right?

ruanwenjun · 2021-07-25T03:04:07Z

@yzhao244 Great, you mean if we use Mysql then we don't need to consider Scheme synchronization, because all the runtimes connect to the same Mysql. And if we use a public file system(e.g. NFS) to store h2 persistent file, then we also needn't consider Scheme synchronization, because the h2 help us to the job, am I right?
By the way, I don't know much about this, but I think your plan is ok. I think you would better send a mail to the community, let more people know your plan, and Apache community believes that all important decision need to be made in mail list.

Jackzeng1224 · 2021-07-27T07:05:01Z

@yzhao244 hello，Can the module be tested and used normally now? or still to be modified.

qqeasonchen · 2021-07-28T02:20:05Z

@yzhao244 hi, I suggest split this pr into several small ones, so that it can easily be reviewed and merged, for example, eventmesh-rest、eventmesh-store-api、eventmesh-store-h2 ect.

qqeasonchen · 2021-07-28T02:55:19Z

@yzhao244 Could you please submmit this feature to branch openschema? i think eventmesh-rest can be merged to develop first.

yzhao244 · 2021-07-28T04:04:30Z

@qqeasonchen @Jackzeng1224 @ruanwenjun Hi guys, I agree with @qqeasonchen that splitting this pr into smaller ones will be easier and safer for reviewing and merging each individual plugin/module. Therefore, I am thinking to close this PR and will submit separate PRs for each module after some modifications.

Additionally, @ruanwenjun brought a good point regarding decision-making of important design. Should I create a design doc and push it to https://github.com/apache/incubator-eventmesh/tree/develop/docs/en/features (similar as eventmesh-stream-design.md which explains design in details and gets the whole community's awareness instead of only explaining designs under an issue) :)

qqeasonchen · 2021-07-28T06:39:12Z

@yzhao244 That would be good if the desing was clear.

yzhao244 added 4 commits July 11, 2021 21:23

schema registry initial check-in

5551657

schema registry schema service implementation

9bd09d2

comment out build gradle file

a6b2408

fix auto-merging conflicts

e7c33c1

github-actions bot reviewed Jul 13, 2021

View reviewed changes

qqeasonchen changed the title ~~OpenSchema integration with EventMesh~~ [ISSUE #339] OpenSchema integration with EventMesh Jul 14, 2021

ruanwenjun reviewed Jul 14, 2021

View reviewed changes

include license header

d490f04

made eventmesh-store-h2 as a submodule of eventmesh-store-plugin and …

07b917a

…addressed other review comments

yzhao244 added 3 commits July 16, 2021 11:57

fixed DBDataSource singleton problem

b352d0c

resolve conflict

812e6c2

resolve conflict

56d045c

removed static from ds

7acdc60

yzhao244 added 2 commits July 20, 2021 21:53

resolve merge conflicts

957d951

resolve merge conflicts

e7ca9dd

Merge branch 'develop' into yuridev

652099e

yzhao244 added 3 commits July 21, 2021 12:21

Update CommonConfiguration.java

2882076

resolve build issue

Merge branch 'apache:develop' into yuridev

86c0e8e

move eventmesh-store-api to be under eventmesh-store-plugin

23c14b3

yzhao244 mentioned this pull request Jul 21, 2021

[Feature] Integrate With OpenSchema #339

Open

yzhao244 changed the title ~~[ISSUE #339] OpenSchema integration with EventMesh~~ [ISSUE #453] OpenSchema integration with EventMesh Jul 21, 2021

yzhao244 closed this Jul 30, 2021

		@@ -0,0 +1,94 @@
		package org.apache.eventmesh.runtime.admin.handler;


		private Logger logger = LoggerFactory.getLogger(CreateSubjectHandler.class);

		private static ObjectMapper jsonMapper;


		private String compatibilityLevel;

		/* @ApiModelProperty(value = "Compatability Level",


		import com.fasterxml.jackson.annotation.JsonProperty;

		public class BaseRequest {


		}

		public static synchronized DBDataSource createDataSource(DBConfiguration dbConfig) {

[ISSUE #453] OpenSchema integration with EventMesh #434

[ISSUE #453] OpenSchema integration with EventMesh #434

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yzhao244 commented Jul 13, 2021 • edited Loading

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Documentation

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