python 谷歌云功能解压文件

Question

我是 GCP 的新手，有使用 Python 的经验。 我尝试为一个场景编写一个云函数来解压 GCS 中的文件并将它们复制到另一个存储桶。

from google.cloud import storage
import tarfile

client = storage.Client()

def untar_lookupfiles(data, context):
    # Get the file that has been uploaded to GCS
    bucket = client.get_bucket(data['Source_bucketName'])

    #copy the tarfiles to another bucket
    bucket = client.get_bucket('Target_bucketName')
    blob = bucket.blob('gs://path/to/file.name')
    blob.upload_from_filename('/path/to/source.file')

    # Untar the files
    print('Untaring Files: {}'.format(data['name']))
    untar = tarfile.open("marfiles.tar.gz", "r:gz") # filename is hard coded should be replaced with data['name']
    untar.extractall(path=dir)

但看起来这段代码中缺少一些东西，有人可以帮我写代码吗？我没有使用 nodejs 编写代码的经验。感谢您的帮助。

Answer 1

这是一个函数，它将解压放在一个存储桶中的文件并将内容放入另一个存储桶：

在requirements.txt:

google-cloud-storage

在main.py:

import io
import os
import tarfile

from google.cloud import storage

client = storage.Client()
input_bucket = client.get_bucket('INPUT-BUCKET-NAME')
output_bucket = client.get_bucket('OUTPUT-BUCKET-NAME')


def untar(data, context):
    # Get the contents of the uploaded file
    input_blob = input_bucket.get_blob(data['name']).download_as_string()

    # Turn the upload file into a tar file
    tar = tarfile.open(fileobj=io.BytesIO(input_blob))

    # Iterate over all files in the tar file
    for member in tar.getnames():

        # Extract the individual file
        file_object = tar.extractfile(member)

        # Check if it's a file or directory (which should be skipped)
        if file_object:

            # Create a new blob instance in the output bucket
            output_blob = output_bucket.blob(os.path.join(data['name'], member))

            # Write the contents of the file to the output blob
            output_blob.upload_from_string(file_object.read())

部署：

$ gcloud beta functions deploy test \
    --runtime python37 \
    --project PROJECT_NAME \
    --trigger-resource INPUT_BUCKET_NAME \
    --trigger-event google.storage.object.finalize