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299
vendor/cloud.google.com/go/pubsub/example_test.go
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vendored
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299
vendor/cloud.google.com/go/pubsub/example_test.go
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// Copyright 2014 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package pubsub_test
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import (
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"fmt"
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"time"
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"cloud.google.com/go/pubsub"
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"golang.org/x/net/context"
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"google.golang.org/api/iterator"
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)
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func ExampleNewClient() {
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ctx := context.Background()
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_, err := pubsub.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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// See the other examples to learn how to use the Client.
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}
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func ExampleClient_CreateTopic() {
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ctx := context.Background()
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client, err := pubsub.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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// Create a new topic with the given name.
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topic, err := client.CreateTopic(ctx, "topicName")
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if err != nil {
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// TODO: Handle error.
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}
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_ = topic // TODO: use the topic.
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}
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func ExampleClient_CreateSubscription() {
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ctx := context.Background()
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client, err := pubsub.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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// Create a new topic with the given name.
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topic, err := client.CreateTopic(ctx, "topicName")
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if err != nil {
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// TODO: Handle error.
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}
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// Create a new subscription to the previously created topic
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// with the given name.
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sub, err := client.CreateSubscription(ctx, "subName", topic, 10*time.Second, nil)
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if err != nil {
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// TODO: Handle error.
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}
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_ = sub // TODO: use the subscription.
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}
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func ExampleTopic_Delete() {
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ctx := context.Background()
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client, err := pubsub.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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topic := client.Topic("topicName")
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if err := topic.Delete(ctx); err != nil {
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// TODO: Handle error.
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}
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}
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func ExampleTopic_Exists() {
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ctx := context.Background()
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client, err := pubsub.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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topic := client.Topic("topicName")
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ok, err := topic.Exists(ctx)
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if err != nil {
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// TODO: Handle error.
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}
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if !ok {
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// Topic doesn't exist.
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}
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}
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func ExampleTopic_Publish() {
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ctx := context.Background()
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client, err := pubsub.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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topic := client.Topic("topicName")
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msgIDs, err := topic.Publish(ctx, &pubsub.Message{
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Data: []byte("hello world"),
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})
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if err != nil {
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// TODO: Handle error.
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}
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fmt.Printf("Published a message with a message ID: %s\n", msgIDs[0])
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}
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func ExampleTopic_Subscriptions() {
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ctx := context.Background()
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client, err := pubsub.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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topic := client.Topic("topic-name")
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// List all subscriptions of the topic (maybe of multiple projects).
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for subs := topic.Subscriptions(ctx); ; {
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sub, err := subs.Next()
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if err == iterator.Done {
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break
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}
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if err != nil {
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// TODO: Handle error.
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}
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_ = sub // TODO: use the subscription.
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}
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}
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func ExampleSubscription_Delete() {
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ctx := context.Background()
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client, err := pubsub.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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sub := client.Subscription("subName")
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if err := sub.Delete(ctx); err != nil {
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// TODO: Handle error.
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}
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}
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func ExampleSubscription_Exists() {
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ctx := context.Background()
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client, err := pubsub.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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sub := client.Subscription("subName")
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ok, err := sub.Exists(ctx)
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if err != nil {
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// TODO: Handle error.
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}
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if !ok {
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// Subscription doesn't exist.
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}
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}
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func ExampleSubscription_Config() {
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ctx := context.Background()
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client, err := pubsub.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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sub := client.Subscription("subName")
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config, err := sub.Config(ctx)
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if err != nil {
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// TODO: Handle error.
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}
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fmt.Println(config)
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}
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func ExampleSubscription_Pull() {
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ctx := context.Background()
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client, err := pubsub.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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it, err := client.Subscription("subName").Pull(ctx)
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if err != nil {
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// TODO: Handle error.
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}
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// Ensure that the iterator is closed down cleanly.
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defer it.Stop()
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}
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func ExampleSubscription_Pull_options() {
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ctx := context.Background()
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client, err := pubsub.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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sub := client.Subscription("subName")
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// This program is expected to process and acknowledge messages
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// in 5 seconds. If not, Pub/Sub API will assume the message is not
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// acknowledged.
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it, err := sub.Pull(ctx, pubsub.MaxExtension(5*time.Second))
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if err != nil {
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// TODO: Handle error.
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}
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// Ensure that the iterator is closed down cleanly.
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defer it.Stop()
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}
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func ExampleSubscription_ModifyPushConfig() {
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ctx := context.Background()
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client, err := pubsub.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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sub := client.Subscription("subName")
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if err := sub.ModifyPushConfig(ctx, &pubsub.PushConfig{Endpoint: "https://example.com/push"}); err != nil {
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// TODO: Handle error.
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}
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}
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func ExampleMessageIterator_Next() {
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ctx := context.Background()
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client, err := pubsub.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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it, err := client.Subscription("subName").Pull(ctx)
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if err != nil {
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// TODO: Handle error.
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}
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// Ensure that the iterator is closed down cleanly.
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defer it.Stop()
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// Consume 10 messages.
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for i := 0; i < 10; i++ {
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m, err := it.Next()
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if err == iterator.Done {
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// There are no more messages. This will happen if it.Stop is called.
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break
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}
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if err != nil {
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// TODO: Handle error.
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break
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}
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fmt.Printf("message %d: %s\n", i, m.Data)
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// Acknowledge the message.
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m.Done(true)
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}
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}
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func ExampleMessageIterator_Stop_defer() {
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// If all uses of the iterator occur within the lifetime of a single
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// function, stop it with defer.
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ctx := context.Background()
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client, err := pubsub.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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it, err := client.Subscription("subName").Pull(ctx)
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if err != nil {
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// TODO: Handle error.
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}
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// Ensure that the iterator is closed down cleanly.
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defer it.Stop()
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// TODO: Use the iterator (see the example for MessageIterator.Next).
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}
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func ExampleMessageIterator_Stop_goroutine() *pubsub.MessageIterator {
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// If you use the iterator outside the lifetime of a single function, you
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// must still stop it.
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// This (contrived) example returns an iterator that will yield messages
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// for ten seconds, and then stop.
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ctx := context.Background()
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client, err := pubsub.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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it, err := client.Subscription("subName").Pull(ctx)
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if err != nil {
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// TODO: Handle error.
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}
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// Stop the iterator after receiving messages for ten seconds.
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go func() {
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time.Sleep(10 * time.Second)
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it.Stop()
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}()
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return it
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}
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