我找到了一个很好的例子来刷新这个链接中的凭证：
https://pritul95.github.io/blogs/boto3/2020/08/01/refreshable-boto3-session/
但是里面有一个小bug。请注意。这是修正后的代码：
from uuid import uuid4
from datetime import datetime
from time import time
import pytz
from boto3 import Session
from botocore.credentials import RefreshableCredentials
from botocore.session import get_session
class RefreshableBotoSession:
"""
Boto Helper class which lets us create a refreshable session so that we can cache the client or resource.
Usage
-----
session = RefreshableBotoSession().refreshable_session()
client = session.client("s3") # we now can cache this client object without worrying about expiring credentials
"""
def __init__(
self,
region_name: str = None,
profile_name: str = None,
sts_arn: str = None,
session_name: str = None,
session_ttl: int = 3000
):
"""
Initialize `RefreshableBotoSession`
Parameters
----------
region_name : str (optional)
Default region when creating a new connection.
profile_name : str (optional)
The name of a profile to use.
sts_arn : str (optional)
The role arn to sts before creating a session.
session_name : str (optional)
An identifier for the assumed role session. (required when `sts_arn` is given)
session_ttl : int (optional)
An integer number to set the TTL for each session. Beyond this session, it will renew the token.
50 minutes by default which is before the default role expiration of 1 hour
"""
self.region_name = region_name
self.profile_name = profile_name
self.sts_arn = sts_arn
self.session_name = session_name or uuid4().hex
self.session_ttl = session_ttl
def __get_session_credentials(self):
"""
Get session credentials
"""
session = Session(region_name=self.region_name, profile_name=self.profile_name)
if self.sts_arn:
sts_client = session.client(service_name="sts", region_name=self.region_name)
response = sts_client.assume_role(
RoleArn=self.sts_arn,
RoleSessionName=self.session_name,
DurationSeconds=self.session_ttl,
).get("Credentials")
credentials = {
"access_key": response.get("AccessKeyId"),
"secret_key": response.get("SecretAccessKey"),
"token": response.get("SessionToken"),
"expiry_time": response.get("Expiration").isoformat(),
}
else:
session_credentials = session.get_credentials().get_frozen_credentials()
credentials = {
"access_key": session_credentials.access_key,
"secret_key": session_credentials.secret_key,
"token": session_credentials.token,
"expiry_time": datetime.fromtimestamp(time() + self.session_ttl).replace(tzinfo=pytz.utc).isoformat(),
}
return credentials
def refreshable_session(self) -> Session:
"""
Get refreshable boto3 session.
"""
refreshable_credentials = RefreshableCredentials.create_from_metadata(
metadata=self.__get_session_credentials(),
refresh_using=self.__get_session_credentials,
method="sts-assume-role",
)
session = get_session()
session._credentials = refreshable_credentials
session.set_config_variable("region", self.region_name)
autorefresh_session = Session(botocore_session=session)
return autorefresh_session
请注意，您需要安装
pytz。
