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print.go
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print.go
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package main
import (
"context"
"encoding/json"
"fmt"
"log"
"cloud.google.com/go/pubsub"
"github.com/spf13/cobra"
"google.golang.org/api/iterator"
)
func newPrintCommand(ctx context.Context) *cobra.Command {
return &cobra.Command{
Use: "print",
Short: "Print the list of the topics registered in the emulator",
Args: cobra.NoArgs,
Run: func(command *cobra.Command, _ []string) {
host := command.Flag("host").Value.String()
projectID := command.Flag("project_id").Value.String()
client, err := setupClient(ctx, host, projectID)
if err != nil {
log.Fatalln(err)
}
if err := printResources(ctx, client); err != nil {
log.Fatalln(err)
}
},
}
}
// Print the list of the topics registered in the emulator
func printResources(ctx context.Context, client *pubsub.Client) error {
topicIDs, err := collectTopicIDs(ctx, client)
if err != nil {
return err
}
subscriptionIDs, err := collectSubscriptionIDs(ctx, client)
if err != nil {
return err
}
type resources struct {
TopicIDs []string `json:"topics"`
SubscriptionIDs []string `json:"subscriptions"`
}
r := resources{TopicIDs: topicIDs, SubscriptionIDs: subscriptionIDs}
b, err := json.MarshalIndent(r, "", " ")
if err != nil {
return err
}
fmt.Println(string(b))
return nil
}
func collectTopicIDs(ctx context.Context, client *pubsub.Client) ([]string, error) {
topics := client.Topics(ctx)
topicIDs := make([]string, 0)
for {
topic, err := topics.Next()
if err == iterator.Done {
break
}
if err != nil {
return nil, err
}
topicIDs = append(topicIDs, topic.ID())
}
return topicIDs, nil
}
func collectSubscriptionIDs(ctx context.Context, client *pubsub.Client) ([]string, error) {
subscriptions := client.Subscriptions(ctx)
subscriptionIDs := make([]string, 0)
for {
subscription, err := subscriptions.Next()
if err == iterator.Done {
break
}
if err != nil {
return nil, err
}
subscriptionIDs = append(subscriptionIDs, subscription.ID())
}
return subscriptionIDs, nil
}