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pubsub.go
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pubsub.go
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package pubsub
import (
"context"
"os"
"cloud.google.com/go/pubsub"
"golang.org/x/oauth2/google"
"google.golang.org/api/compute/v1"
)
type Pubsub struct {
client *pubsub.Client
emulatorHost string
subscriptions map[string]*pubsub.SubscriptionConfig
}
func New(project, emulatorHost string) (*Pubsub, error) {
if emulatorHost != "" {
os.Setenv("PUBSUB_EMULATOR_HOST", emulatorHost)
}
if project == "" {
if emulatorHost != "" {
project = "emulator-project"
} else {
ctx := context.Background()
credentials, err := google.FindDefaultCredentials(ctx, compute.ComputeScope)
if err != nil {
return nil, err
}
project = credentials.ProjectID
}
}
ps := &Pubsub{
emulatorHost: emulatorHost,
subscriptions: make(map[string]*pubsub.SubscriptionConfig),
}
if err := ps.UpdateProject(project); err != nil {
return nil, err
}
return ps, nil
}
func (p *Pubsub) UpdateProject(project string) error {
ctx := context.Background()
client, err := pubsub.NewClient(ctx, project)
if err != nil {
return err
}
if p.client != nil {
p.client.Close()
}
p.client = client
return nil
}
func (p *Pubsub) Project() string {
return p.client.Project()
}
func (p *Pubsub) Host() string {
if p.emulatorHost != "" {
return p.emulatorHost
}
return "pubsub.googleapis.com"
}
func (p *Pubsub) Close() error {
return p.client.Close()
}