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pubsub.go
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pubsub.go
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// Copyright 2020 dkisler.com Dmitry Kisler
//
// 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
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND
// NONINFRINGEMENT. IN NO EVENT WILL THE LICENSOR OR OTHER CONTRIBUTORS
// BE LIABLE FOR ANY CLAIM, DAMAGES, OR OTHER LIABILITY, WHETHER IN AN
// ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF, OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
// See the License for the specific language governing permissions and
// limitations under the License.
package bus
import (
"context"
"cloud.google.com/go/pubsub"
"google.golang.org/api/option"
)
// Client defines the client to communicate with the message bus.
type Client struct {
// GCP Project ID
ProjectID string
Ctx context.Context
Opts []option.ClientOption
Instance *pubsub.Client
}
// Connect establishes connector to the message broker.
func (c *Client) Connect() error {
var err error
c.Ctx = context.Background()
c.Instance, err = pubsub.NewClient(c.Ctx, c.ProjectID, c.Opts...)
return err
}
// Push pushes the message to a topic.
func (c *Client) Push(payload []byte, topic string) error {
t := c.Instance.Topic(topic)
t.PublishSettings.NumGoroutines = 1
result := t.Publish(c.Ctx, &pubsub.Message{Data: payload})
// Block until the result is returned and a server-generated
// ID is returned for the published message.
_, err := result.Get(c.Ctx)
return err
}
// PushRoutine marshal the output payload object.
func (c *Client) PushRoutine(payload []byte, topic string, ch chan error) {
err := c.Push(payload, topic)
ch <- err
}