Python 创建脚本以检索上载到Google云存储桶的图像

我已经设置了一个云存储bucket、一个云发布/子主题和一个订阅，以便在文件上载到bucket时创建一个通知

---

我想在服务器上创建一个脚本，当一个新图像上传到bucket时订阅该消息，并将该图像本地下载到服务器。我不知道该怎么做——有人能给我提供正确方向的资源或指针吗？

答案是几个方面的组合。我必须做的事情的要点可以在以下方法中找到：

from google.cloud import pubsub_v1, storage

def retrieve_image(message):

    attributes = message.attributes

    bucket_id = attributes['bucketId']
    source_blob_name = attributes['objectId']
    destination_file_name = 'images/' + source_blob_name

    download_blob(bucket_id, source_blob_name, destination_file_name)

def download_blob(bucket_name, source_blob_name, destination_file_name):
    """Downloads a blob from the bucket."""
    storage_client = storage.Client()
    bucket = storage_client.get_bucket(bucket_name)
    blob = bucket.blob(source_blob_name)

    blob.download_to_filename(destination_file_name)

    print('Blob {} downloaded to {}.'.format(
        source_blob_name,
        destination_file_name))

def poll_notifications(project, subscription_name):
    """Polls a Cloud Pub/Sub subscription for new GCS events for display."""
    # [BEGIN poll_notifications]
    subscriber = pubsub_v1.SubscriberClient()
    subscription_path = subscriber.subscription_path(
        project, subscription_name)

    def callback(message):
        print('Received message:\n{}'.format(summarize(message)))
        retrieve_image(message)
        # run_openpose(message)
        message.ack()

    subscriber.subscribe(subscription_path, callback=callback)

    # The subscriber is non-blocking, so we must keep the main thread from
    # exiting to allow it to process messages in the background.
    print('Listening for messages on {}'.format(subscription_path))
    while True:
        time.sleep(60)
    # [END poll_notifications]

---

答案是几件事的结合。我必须做的事情的要点可以在以下方法中找到：

from google.cloud import pubsub_v1, storage

def retrieve_image(message):

    attributes = message.attributes

    bucket_id = attributes['bucketId']
    source_blob_name = attributes['objectId']
    destination_file_name = 'images/' + source_blob_name

    download_blob(bucket_id, source_blob_name, destination_file_name)

def download_blob(bucket_name, source_blob_name, destination_file_name):
    """Downloads a blob from the bucket."""
    storage_client = storage.Client()
    bucket = storage_client.get_bucket(bucket_name)
    blob = bucket.blob(source_blob_name)

    blob.download_to_filename(destination_file_name)

    print('Blob {} downloaded to {}.'.format(
        source_blob_name,
        destination_file_name))

def poll_notifications(project, subscription_name):
    """Polls a Cloud Pub/Sub subscription for new GCS events for display."""
    # [BEGIN poll_notifications]
    subscriber = pubsub_v1.SubscriberClient()
    subscription_path = subscriber.subscription_path(
        project, subscription_name)

    def callback(message):
        print('Received message:\n{}'.format(summarize(message)))
        retrieve_image(message)
        # run_openpose(message)
        message.ack()

    subscriber.subscribe(subscription_path, callback=callback)

    # The subscriber is non-blocking, so we must keep the main thread from
    # exiting to allow it to process messages in the background.
    print('Listening for messages on {}'.format(subscription_path))
    while True:
        time.sleep(60)
    # [END poll_notifications]

---

请向我们展示您的脚本到目前为止的样子，以便我们可以看到我们可以如何帮助您。我不确定从哪里开始。我已经使用

gsutil mb gs://image\u upload\u bucket

创建了一个新bucket，并且

gsutil notification create-t upload\u images-f json-e OBJECT\u FINALIZE gs gs://image\u upload\u bucket

将发布/订阅主题写入bucket，我还使用

gcloud beta pubsub sub sub subscriptions create analyze\u image创建了一个订阅--topic=上传图片以查看通知。我想做的是检索上传到bucket的图像，并在本地下载，这可能吗？获取检索图像的命令是gsutil cp gs://bucketname/imagefilename。请指定文件夹名而不是“.”我解决了我的问题。将在下面发布。是Inder的link+的组合。请向我们展示您的脚本到目前为止的外观，以便我们可以看到我们可以如何帮助您。我不确定从哪里开始。我已经使用
gsutil mb gs://image\u upload\u bucket
创建了一个新bucket，并且
gsutil notification create-t upload\u images-f json-e OBJECT\u FINALIZE gs gs://image\u upload\u bucket
将发布/订阅主题写入bucket，我还使用
gcloud beta pubsub sub sub subscriptions create analyze\u image创建了一个订阅--topic=上传图片以查看通知。我想做的是检索上传到bucket的图像，并在本地下载，这可能吗？获取检索图像的命令是gsutil cp gs://bucketname/imagefilename。请指定文件夹名而不是“.”我解决了我的问题。将在下面发布。是Inder链接的组合+