Sample golang lambda pub/sub consumer

helloWorld.go

// Package helloworld provides a set of Cloud Functions samples.
package helloworld

import (
        "context"
        "log"
)

// PubSubMessage is the payload of a Pub/Sub event.
type PubSubMessage struct {
        Data []byte `json:"data"`
}

// HelloPubSub consumes a Pub/Sub message.
func HelloPubSub(ctx context.Context, m PubSubMessage) error {
        name := string(m.Data)
        if name == "" {
                name = "World"
        }
        log.Printf("Hello, %s!", name)
        return nil
}