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[Go Functions] Add newOuputMessage interface for Go Function (apache#…
…8327) Signed-off-by: xiaolong.ran <[email protected]> Fixes apache#8266 ### Motivation Implement the context object to be able to send to different topics. Like with the java SDK that allows you to return a future, which makes sending to arbitrary topics easy and fast, we may want to think of an analogous approach ### Modifications - Add `NewOuputMessage()` interface for Go Function - Add examples for `NewOuputMessage()` - Add docs for `NewOuputMessage()` ### Verifying this change - [x] Make sure that the change passes the CI checks. This change added tests and can be verified as follows: - Added unit tests for `FunctionContext#NewOutputMessage` ### Does this pull request potentially affect one of the following parts: - The public API: (yes) - The default values of configurations: (yes) ### Documentation - Does this pull request introduce a new feature? (yes ) - If yes, how is the feature documented? (docs)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,54 @@ | ||
| // | ||
| // Licensed to the Apache Software Foundation (ASF) under one | ||
| // or more contributor license agreements. See the NOTICE file | ||
| // distributed with this work for additional information | ||
| // regarding copyright ownership. The ASF licenses this file | ||
| // to you under the Apache License, Version 2.0 (the | ||
| // "License"); you may not use this file except in compliance | ||
| // with the License. You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, | ||
| // software distributed under the License is distributed on an | ||
| // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | ||
| // KIND, either express or implied. See the License for the | ||
| // specific language governing permissions and limitations | ||
| // under the License. | ||
| // | ||
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| package main | ||
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| import ( | ||
| "context" | ||
| "errors" | ||
| "log" | ||
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| "github.com/apache/pulsar-client-go/pulsar" | ||
| "github.com/apache/pulsar/pulsar-function-go/pf" | ||
| ) | ||
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| func PublishFunc(ctx context.Context, in []byte) error { | ||
| fctx, ok := pf.FromContext(ctx) | ||
| if !ok { | ||
| return errors.New("get Go Functions Context error") | ||
| } | ||
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| publishTopic := "publish-topic" | ||
| output := append(in, 110) | ||
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| producer := fctx.NewOutputMessage(publishTopic) | ||
| msgID, err := producer.Send(ctx, &pulsar.ProducerMessage{ | ||
| Payload: output, | ||
| }) | ||
| if err != nil { | ||
| log.Fatal(err) | ||
| } | ||
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| log.Printf("The output message ID is: %+v", msgID) | ||
| return nil | ||
| } | ||
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| func main() { | ||
| pf.Start(PublishFunc) | ||
| } |
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