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// Copyright 2019 Google LLC
//
// 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
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
// [START containeranalysis_pubsub]
import (
"context"
"fmt"
"io"
"sync"
"time"
pubsub "cloud.google.com/go/pubsub"
)
// occurrencePubsub handles incoming Occurrences using a Cloud Pub/Sub subscription.
func occurrencePubsub(w io.Writer, subscriptionID string, timeout time.Duration, projectID string) (int, error) {
// subscriptionID := fmt.Sprintf("my-occurrences-subscription")
// timeout := time.Duration(20) * time.Second
ctx := context.Background()
var mu sync.Mutex
client, err := pubsub.NewClient(ctx, projectID)
if err != nil {
return -1, fmt.Errorf("pubsub.NewClient: %v", err)
}
// Subscribe to the requested Pub/Sub channel.
sub := client.Subscription(subscriptionID)
count := 0
// Listen to messages for 'timeout' seconds.
ctx, cancel := context.WithTimeout(ctx, timeout)
defer cancel()
err = sub.Receive(ctx, func(ctx context.Context, msg *pubsub.Message) {
mu.Lock()
count = count + 1
fmt.Fprintf(w, "Message %d: %q\n", count, string(msg.Data))
msg.Ack()
mu.Unlock()
})
if err != nil {
return -1, fmt.Errorf("sub.Receive: %v", err)
}
// Print and return the number of Pub/Sub messages received.
fmt.Fprintln(w, count)
return count, nil
}
// createOccurrenceSubscription creates a new Pub/Sub subscription object listening to the Occurrence topic.
func createOccurrenceSubscription(subscriptionID, projectID string) error {
// subscriptionID := fmt.Sprintf("my-occurrences-subscription")
ctx := context.Background()
client, err := pubsub.NewClient(ctx, projectID)
if err != nil {
return fmt.Errorf("pubsub.NewClient: %v", err)
}
defer client.Close()
// This topic id will automatically receive messages when Occurrences are added or modified
topicID := "container-analysis-occurrences-v1"
topic := client.Topic(topicID)
config := pubsub.SubscriptionConfig{Topic: topic}
_, err = client.CreateSubscription(ctx, subscriptionID, config)
return fmt.Errorf("client.CreateSubscription: %v", err)
}
// [END containeranalysis_pubsub]
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