分布式系统中 Golang 函数与消息队列的集成

package helloqueue

import (
    "context"
    "fmt"
    "log"

    "cloud.google.com/go/functions/metadata"
    "cloud.google.com/go/pubsub"
)

func init() {
    // Get the details of the message.
    client, err := pubsub.NewClient(context.Background(), "my-project")
    if err != nil {
        log.Fatalf("pubsub.NewClient: %v", err)
    }
    defer client.Close()

    // Set up a handler for messages on the subscription.
    sub := client.Subscription("my-sub")
    sub.Receive(context.Background(), func(ctx context.Context, msg *pubsub.Message) {
        // Get metadata about the function and request.
        meta, err := metadata.FromContext(ctx)
        if err != nil {
            log.Fatalf("metadata.FromContext: %v", err)
        }
        fmt.Printf("Function: %s\n", meta.Resource)
        fmt.Printf("Message: %s\n", string(msg.Data))
        msg.Ack()
    })
}