mirror of https://github.com/tidwall/tile38.git
110 lines
2.0 KiB
Go
110 lines
2.0 KiB
Go
package endpoint
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import (
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"cloud.google.com/go/pubsub"
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"context"
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"errors"
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"fmt"
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"github.com/streadway/amqp"
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"google.golang.org/api/option"
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"sync"
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"time"
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)
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const pubsubExpiresAfter = time.Second * 30
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var errMissingGoogleCredentials = errors.New("Could not find GCP credentials - no credential path was submitted and envar GOOGLE_APPLICATION_CREDENTIALS is not set")
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// SQSConn is an endpoint connection
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type PubSubConn struct {
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mu sync.Mutex
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ep Endpoint
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svc *pubsub.Client
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topic *pubsub.Topic
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channel *amqp.Channel
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ex bool
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t time.Time
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}
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func (conn *PubSubConn) generatePubSubURL() string {
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if conn.ep.SQS.PlainURL != "" {
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return conn.ep.SQS.PlainURL
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}
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return "projects/" + conn.ep.PubSub.Project + "/topics/" + conn.ep.PubSub.Topic
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}
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func (conn *PubSubConn) close() {
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if conn.svc != nil {
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conn.svc.Close()
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conn.svc = nil
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}
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}
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// Send sends a message
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func (conn *PubSubConn) Send(msg string) error {
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conn.mu.Lock()
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defer conn.mu.Unlock()
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if conn.ex {
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return errExpired
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}
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ctx := context.Background()
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conn.t = time.Now()
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if conn.svc == nil {
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var creds option.ClientOption
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var svc *pubsub.Client
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var err error
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credPath := conn.ep.PubSub.CredPath
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if credPath != "" {
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creds = option.WithCredentialsFile(credPath)
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svc, err = pubsub.NewClient(ctx, conn.ep.PubSub.Project, creds)
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} else {
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svc, err = pubsub.NewClient(ctx, conn.ep.PubSub.Project)
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}
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if err != nil {
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fmt.Println(err)
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return err
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}
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topic := svc.Topic(conn.ep.PubSub.Topic)
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conn.svc = svc
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conn.topic = topic
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}
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// Send message
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res := conn.topic.Publish(ctx, &pubsub.Message{
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Data: []byte(msg),
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})
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_, err := res.Get(ctx)
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if err != nil {
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fmt.Println(err)
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return err
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}
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return nil
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}
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func (conn *PubSubConn) Expired() bool {
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conn.mu.Lock()
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defer conn.mu.Unlock()
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if !conn.ex {
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if time.Now().Sub(conn.t) > pubsubExpiresAfter {
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conn.ex = true
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conn.close()
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}
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}
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return conn.ex
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}
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func newPubSubConn(ep Endpoint) *PubSubConn {
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return &PubSubConn{
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ep: ep,
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t: time.Now(),
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}
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}
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