Python, Boto3, and AWS S3: Demystified

[uniquejava]

https://realpython.com/python-boto3-aws-s3/

两种创建client的接口

# client: low-level的接口(返回一个需要自己解析的dict）
import boto3
s3_client = boto3.client('s3')

# resource: high level面向对象接口
import boto3
s3_resource = boto3.resource('s3')

# 通过resource取到client
s3_resource.meta.client

# 类似百度网盘的分享功能，允许用户在一段时间内直接访问bucket中的某资源
client.generate_presigned_url()

# 给bucket取个全球范围内不会重复的名字
import uuid
def create_bucket_name(bucket_prefix):
    # The generated bucket name must be between 3 and 63 chars long
    return ''.join([bucket_prefix, str(uuid.uuid4())])

s3_resource.create_bucket(Bucket=YOUR_BUCKET_NAME,
                          CreateBucketConfiguration={
                              'LocationConstraint': 'eu-west-1'})

根据用户当前的session自动选择合适的location

不论是部署到 locally/EC2/Lambda

def create_bucket(bucket_prefix, s3_connection):
    session = boto3.session.Session()
    current_region = session.region_name
    bucket_name = create_bucket_name(bucket_prefix)
    bucket_response = s3_connection.create_bucket(
        Bucket=bucket_name,
        CreateBucketConfiguration={
        'LocationConstraint': current_region})
    print(bucket_name, current_region)
    return bucket_name, bucket_response

[uniquejava]

调用方式一 (传client)

>>> first_bucket_name, first_response = create_bucket(
...     bucket_prefix='firstpythonbucket', 
...     s3_connection=s3_resource.meta.client)
firstpythonbucket7250e773-c4b1-422a-b51f-c45a52af9304 eu-west-1

>>> first_response
{'ResponseMetadata': {'RequestId': 'E1DCFE71EDE7C1EC', 'HostId': 'r3AP32NQk9dvbHSEPIbyYADT769VQEN/+xT2BPM6HCnuCb3Z/GhR2SBP+GM7IjcxbBN7SQ+k+9B=', 'HTTPStatusCode': 200, 'HTTPHeaders': {'x-amz-id-2': 'r3AP32NQk9dvbHSEPIbyYADT769VQEN/+xT2BPM6HCnuCb3Z/GhR2SBP+GM7IjcxbBN7SQ+k+9B=', 'x-amz-request-id': 'E1DCFE71EDE7C1EC', 'date': 'Fri, 05 Oct 2018 15:00:00 GMT', 'location': 'http://firstpythonbucket7250e773-c4b1-422a-b51f-c45a52af9304.s3.amazonaws.com/', 'content-length': '0', 'server': 'AmazonS3'}, 'RetryAttempts': 0}, 'Location': 'http://firstpythonbucket7250e773-c4b1-422a-b51f-c45a52af9304.s3.amazonaws.com/'}

调用方式2(传resource)

>>> second_bucket_name, second_response = create_bucket(
...     bucket_prefix='secondpythonbucket', s3_connection=s3_resource)
secondpythonbucket2d5d99c5-ab96-4c30-b7f7-443a95f72644 eu-west-1

>>> second_response
s3.Bucket(name='secondpythonbucket2d5d99c5-ab96-4c30-b7f7-443a95f72644')