129 lines
3.4 KiB
Go
129 lines
3.4 KiB
Go
/*
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Copyright 2021 The Dapr Authors
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package pubsub
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import (
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"context"
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"encoding/json"
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"fmt"
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"cloud.google.com/go/pubsub"
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"google.golang.org/api/option"
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"github.com/dapr/components-contrib/bindings"
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"github.com/dapr/kit/logger"
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)
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const (
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id = "id"
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publishTime = "publishTime"
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topic = "topic"
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)
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// GCPPubSub is an input/output binding for GCP Pub Sub.
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type GCPPubSub struct {
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client *pubsub.Client
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metadata *pubSubMetadata
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logger logger.Logger
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}
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type pubSubMetadata struct {
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Topic string `json:"topic"`
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Subscription string `json:"subscription"`
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Type string `json:"type"`
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ProjectID string `json:"project_id"`
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PrivateKeyID string `json:"private_key_id"`
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PrivateKey string `json:"private_key"`
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ClientEmail string `json:"client_email"`
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ClientID string `json:"client_id"`
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AuthURI string `json:"auth_uri"`
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TokenURI string `json:"token_uri"`
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AuthProviderCertURL string `json:"auth_provider_x509_cert_url"`
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ClientCertURL string `json:"client_x509_cert_url"`
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}
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// NewGCPPubSub returns a new GCPPubSub instance.
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func NewGCPPubSub(logger logger.Logger) *GCPPubSub {
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return &GCPPubSub{logger: logger}
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}
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// Init parses metadata and creates a new Pub Sub client.
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func (g *GCPPubSub) Init(metadata bindings.Metadata) error {
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b, err := g.parseMetadata(metadata)
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if err != nil {
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return err
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}
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var pubsubMeta pubSubMetadata
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err = json.Unmarshal(b, &pubsubMeta)
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if err != nil {
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return err
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}
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clientOptions := option.WithCredentialsJSON(b)
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ctx := context.Background()
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pubsubClient, err := pubsub.NewClient(ctx, pubsubMeta.ProjectID, clientOptions)
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if err != nil {
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return fmt.Errorf("error creating pubsub client: %s", err)
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}
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g.client = pubsubClient
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g.metadata = &pubsubMeta
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return nil
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}
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func (g *GCPPubSub) parseMetadata(metadata bindings.Metadata) ([]byte, error) {
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b, err := json.Marshal(metadata.Properties)
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return b, err
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}
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func (g *GCPPubSub) Read(handler func(*bindings.ReadResponse) ([]byte, error)) error {
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sub := g.client.Subscription(g.metadata.Subscription)
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err := sub.Receive(context.Background(), func(ctx context.Context, m *pubsub.Message) {
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_, err := handler(&bindings.ReadResponse{
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Data: m.Data,
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Metadata: map[string]string{id: m.ID, publishTime: m.PublishTime.String()},
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})
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if err == nil {
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m.Ack()
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}
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})
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return err
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}
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func (g *GCPPubSub) Operations() []bindings.OperationKind {
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return []bindings.OperationKind{bindings.CreateOperation}
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}
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func (g *GCPPubSub) Invoke(req *bindings.InvokeRequest) (*bindings.InvokeResponse, error) {
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topicName := g.metadata.Topic
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if val, ok := req.Metadata[topic]; ok && val != "" {
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topicName = val
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}
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t := g.client.Topic(topicName)
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ctx := context.Background()
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_, err := t.Publish(ctx, &pubsub.Message{
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Data: req.Data,
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}).Get(ctx)
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return nil, err
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}
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func (g *GCPPubSub) Close() error {
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return g.client.Close()
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}
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