Google Cloud Storage（Python）：如何检查文件上次修改时间？

Question

我们有一项工作是检查云存储上的文件是否已被修改。如果是，则它从文件中读取数据并进一步处理。

我想知道是否有一个 API 可以检查云存储上的文件的最后修改时间。

Answer 1

您现在可以使用Google Storage 的官方 Python 库来执行此操作。

from google.cloud import storage


def blob_metadata(bucket_name, blob_name):
    """Prints out a blob's metadata."""
    # bucket_name = 'your-bucket-name'
    # blob_name = 'your-object-name'

    storage_client = storage.Client()
    bucket = storage_client.bucket(bucket_name)
    blob = bucket.get_blob(blob_name)

    print("Blob: {}".format(blob.name))
    print("Bucket: {}".format(blob.bucket.name))
    print("Storage class: {}".format(blob.storage_class))
    print("ID: {}".format(blob.id))
    print("Size: {} bytes".format(blob.size))
    print("Updated: {}".format(blob.updated))
    print("Generation: {}".format(blob.generation))
    print("Metageneration: {}".format(blob.metageneration))
    print("Etag: {}".format(blob.etag))
    print("Owner: {}".format(blob.owner))
    print("Component count: {}".format(blob.component_count))
    print("Crc32c: {}".format(blob.crc32c))
    print("md5_hash: {}".format(blob.md5_hash))
    print("Cache-control: {}".format(blob.cache_control))
    print("Content-type: {}".format(blob.content_type))
    print("Content-disposition: {}".format(blob.content_disposition))
    print("Content-encoding: {}".format(blob.content_encoding))
    print("Content-language: {}".format(blob.content_language))
    print("Metadata: {}".format(blob.metadata))
    print("Temporary hold: ", "enabled" if blob.temporary_hold else "disabled")
    print(
        "Event based hold: ",
        "enabled" if blob.event_based_hold else "disabled",
    )
    if blob.retention_expiration_time:
        print(
            "retentionExpirationTime: {}".format(
                blob.retention_expiration_time
            )
        )

对于您的情况，您必须查看blob.updated财产

Answer 2

App Engine Cloud Storage 客户端库将向您公开此信息。该库还具有开发应用程序服务器支持。入门有一个例子。