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example_test.go
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example_test.go
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// Copyright 2019 The Go Cloud Development Kit Authors
//
// Licensed 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
//
// https://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 natspubsub_test
import (
"context"
"github.com/nats-io/nats.go/jetstream"
"github.com/pitabwire/natspubsub/connections"
"log"
"github.com/nats-io/nats.go"
"github.com/pitabwire/natspubsub"
"gocloud.dev/pubsub"
)
func ExampleOpenSubscription() {
// PRAGMA: This example is used on gocloud.dev; PRAGMA comments adjust how it is shown and can be ignored.
// PRAGMA: On gocloud.dev, add a blank import: _ "gocloud.dev/pubsub/natspubsub"
// PRAGMA: On gocloud.dev, hide lines until the next blank line.
ctx := context.Background()
natsConn, err := nats.Connect("nats://nats.example.com")
if err != nil {
log.Fatal(err)
}
defer natsConn.Close()
conn := connections.NewPlain(natsConn)
subscription, err := natspubsub.OpenSubscription(
ctx, conn, &connections.SubscriptionOptions{Subjects: []string{"example.mysubject"}})
if err != nil {
log.Fatal(err)
}
defer func(subscription *pubsub.Subscription, ctx context.Context) {
_ = subscription.Shutdown(ctx)
}(subscription, ctx)
}
func ExampleOpenTopic() {
// PRAGMA: This example is used on gocloud.dev; PRAGMA comments adjust how it is shown and can be ignored.
// PRAGMA: On gocloud.dev, add a blank import: _ "gocloud.dev/pubsub/natspubsub"
// PRAGMA: On gocloud.dev, hide lines until the next blank line.
ctx := context.Background()
natsConn, err := nats.Connect("nats://nats.example.com")
if err != nil {
log.Fatal(err)
}
defer natsConn.Close()
js, err := jetstream.New(natsConn)
if err != nil {
log.Fatal(err)
}
conn := connections.NewJetstream(js)
topic, err := natspubsub.OpenTopic(ctx, conn, &connections.TopicOptions{Subject: "example.mysubject"})
if err != nil {
log.Fatal(err)
}
defer func(topic *pubsub.Topic, ctx context.Context) {
_ = topic.Shutdown(ctx)
}(topic, ctx)
}
func Example_openTopicFromURL() {
// PRAGMA: This example is used on gocloud.dev; PRAGMA comments adjust how it is shown and can be ignored.
// PRAGMA: On gocloud.dev, add a blank import: _ "gocloud.dev/pubsub/natspubsub"
// PRAGMA: On gocloud.dev, hide lines until the next blank line.
ctx := context.Background()
// pubsub.OpenTopic creates a *pubsub.Connection from a URL.
// This URL will Dial the NATS server at the URL in the environment variable
// NATS_SERVER_URL and send messages with subject "example.mysubject".
// This URL will be parsed and the natsv2 attribute will be used to
// use NATS v2.2.0+ native message headers as the message metadata.
topic, err := pubsub.OpenTopic(ctx, "nats://nats.example.com/example.mysubject")
if err != nil {
log.Fatal(err)
}
defer func(topic *pubsub.Topic, ctx context.Context) {
_ = topic.Shutdown(ctx)
}(topic, ctx)
}
func Example_openSubscriptionFromURL() {
// PRAGMA: This example is used on gocloud.dev; PRAGMA comments adjust how it is shown and can be ignored.
// PRAGMA: On gocloud.dev, add a blank import: _ "gocloud.dev/pubsub/natspubsub"
// PRAGMA: On gocloud.dev, hide lines until the next blank line.
ctx := context.Background()
// pubsub.OpenSubscription creates a *pubsub.Subscription from a URL.
// This URL will Dial the NATS server at the URL in the environment variable
// NATS_SERVER_URL and receive messages with subject "example.mysubject".
// This URL will be parsed and the natsv2 attribute will be used to
// use NATS v2.2.0+ native message headers as the message metadata.
subscription, err := pubsub.OpenSubscription(ctx, "nats://nats.example.com/example.mysubject?jetstream=true")
if err != nil {
log.Fatal(err)
}
defer func(subscription *pubsub.Subscription, ctx context.Context) {
_ = subscription.Shutdown(ctx)
}(subscription, ctx)
}