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[Go SDK]: Create natsio.Write transform for writing to NATS (#29184)
* Create natsio.Write transform for writing to NATS * Emit representation of acknowledged message from writeFn * Use type map[string][]string for ProduceMessage headers
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,58 @@ | ||
| // 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 natsio contains transforms for interacting with NATS. | ||
| package natsio | ||
|
|
||
| import ( | ||
| "fmt" | ||
|
|
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| "github.com/nats-io/nats.go" | ||
| "github.com/nats-io/nats.go/jetstream" | ||
| ) | ||
|
|
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| type natsFn struct { | ||
| URI string | ||
| CredsFile string | ||
| nc *nats.Conn | ||
| js jetstream.JetStream | ||
| } | ||
|
|
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| func (fn *natsFn) Setup() error { | ||
| var opts []nats.Option | ||
| if fn.CredsFile != "" { | ||
| opts = append(opts, nats.UserCredentials(fn.CredsFile)) | ||
| } | ||
|
|
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| conn, err := nats.Connect(fn.URI, opts...) | ||
| if err != nil { | ||
| return fmt.Errorf("error connecting to NATS: %v", err) | ||
| } | ||
| fn.nc = conn | ||
|
|
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| js, err := jetstream.New(fn.nc) | ||
| if err != nil { | ||
| return fmt.Errorf("error creating JetStream context: %v", err) | ||
| } | ||
| fn.js = js | ||
|
|
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| return nil | ||
| } | ||
|
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| func (fn *natsFn) Teardown() { | ||
| if fn.nc != nil { | ||
| fn.nc.Close() | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,55 @@ | ||
| // 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. | ||
|
|
||
| package natsio_test | ||
|
|
||
| import ( | ||
| "context" | ||
| "log" | ||
|
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| "github.com/apache/beam/sdks/v2/go/pkg/beam" | ||
| "github.com/apache/beam/sdks/v2/go/pkg/beam/io/natsio" | ||
| "github.com/apache/beam/sdks/v2/go/pkg/beam/x/beamx" | ||
| "github.com/nats-io/nats.go" | ||
| ) | ||
|
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| func ExampleWrite() { | ||
| beam.Init() | ||
|
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| p, s := beam.NewPipelineWithRoot() | ||
|
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| uri := "nats://localhost:4222" | ||
| msgs := []natsio.ProducerMessage{ | ||
| { | ||
| Subject: "events.1", | ||
| ID: "123", | ||
| Data: []byte("hello"), | ||
| Headers: nats.Header{"key": []string{"val1"}}, | ||
| }, | ||
| { | ||
| Subject: "events.2", | ||
| ID: "124", | ||
| Data: []byte("world"), | ||
| Headers: nats.Header{"key": []string{"val2"}}, | ||
| }, | ||
| } | ||
|
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| input := beam.CreateList(s, msgs) | ||
| natsio.Write(s, uri, input) | ||
|
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| if err := beamx.Run(context.Background(), p); err != nil { | ||
| log.Fatalf("Failed to execute job: %v", err) | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,130 @@ | ||
| // 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. | ||
|
|
||
| package natsio | ||
|
|
||
| import ( | ||
| "context" | ||
| "testing" | ||
|
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| "github.com/nats-io/nats-server/v2/server" | ||
| "github.com/nats-io/nats-server/v2/test" | ||
| "github.com/nats-io/nats.go" | ||
| "github.com/nats-io/nats.go/jetstream" | ||
| ) | ||
|
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| func newServer(t *testing.T) *server.Server { | ||
| t.Helper() | ||
|
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| opts := &test.DefaultTestOptions | ||
| opts.Port = server.RANDOM_PORT | ||
| opts.JetStream = true | ||
|
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| srv := test.RunServer(opts) | ||
| t.Cleanup(srv.Shutdown) | ||
|
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| return srv | ||
| } | ||
|
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| func newConn(t *testing.T, uri string) *nats.Conn { | ||
| t.Helper() | ||
|
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| conn, err := nats.Connect(uri) | ||
| if err != nil { | ||
| t.Fatalf("Failed to connect to NATS: %v", err) | ||
| } | ||
| t.Cleanup(conn.Close) | ||
|
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| return conn | ||
| } | ||
|
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| func newJetStream(t *testing.T, conn *nats.Conn) jetstream.JetStream { | ||
| t.Helper() | ||
|
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| js, err := jetstream.New(conn) | ||
| if err != nil { | ||
| t.Fatalf("Failed to create JetStream instance: %v", err) | ||
| } | ||
|
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| return js | ||
| } | ||
|
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| func createStream( | ||
| t *testing.T, | ||
| ctx context.Context, | ||
| js jetstream.JetStream, | ||
| stream string, | ||
| subjects []string, | ||
| ) jetstream.Stream { | ||
| t.Helper() | ||
|
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| cfg := jetstream.StreamConfig{ | ||
| Name: stream, | ||
| Subjects: subjects, | ||
| } | ||
| str, err := js.CreateStream(ctx, cfg) | ||
| if err != nil { | ||
| t.Fatalf("Failed to create stream: %v", err) | ||
| } | ||
|
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| t.Cleanup(func() { | ||
| if err := js.DeleteStream(ctx, stream); err != nil { | ||
| t.Fatalf("Failed to delete stream: %v", err) | ||
| } | ||
| }) | ||
|
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| return str | ||
| } | ||
|
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| func createConsumer( | ||
| t *testing.T, | ||
| ctx context.Context, | ||
| js jetstream.JetStream, | ||
| stream string, | ||
| subjects []string, | ||
| ) jetstream.Consumer { | ||
| t.Helper() | ||
|
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| cfg := jetstream.OrderedConsumerConfig{ | ||
| FilterSubjects: subjects, | ||
| } | ||
| cons, err := js.OrderedConsumer(ctx, stream, cfg) | ||
| if err != nil { | ||
| t.Fatalf("Failed to create consumer: %v", err) | ||
| } | ||
|
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| return cons | ||
| } | ||
|
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| func fetchMessages(t *testing.T, cons jetstream.Consumer, size int) []jetstream.Msg { | ||
| t.Helper() | ||
|
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| msgs, err := cons.FetchNoWait(size) | ||
| if err != nil { | ||
| t.Fatalf("Failed to fetch messages: %v", err) | ||
| } | ||
|
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| var result []jetstream.Msg | ||
|
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| for msg := range msgs.Messages() { | ||
| if err := msg.Ack(); err != nil { | ||
| t.Fatalf("Failed to ack message: %v", err) | ||
| } | ||
|
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| result = append(result, msg) | ||
| } | ||
|
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| return result | ||
| } |
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