DynamoDB2 连接错误，但使用 boto 的 DynamoDB 没有

Question

我正在迁移一些代码以使用 boto 的 DynamoDB2 库，但在连接 boot.dynamodb2 时遇到问题。然而，原来的 boto 连接工作正常。

我使用的是 boto 版本 2.32.0 和 python 2.7.3

import boto
import boto.dynamodb2
from boto.dynamodb2.table import Table

access_id = '-------------' # removed
secrey_key = '--------------' # removed

tablename = 'test'
lookup = 'hash1'

conn = boto.connect_dynamodb(aws_access_key_id=access_id, aws_secret_access_key=secret_key)
table1 = conn.get_table(tablename)
item1 = table1.get_item(lookup)
print "DB1 item :: ", item1

conn2 = boto.dynamodb2.connect_to_region('us-east-1', aws_access_key_id=access_id, aws_secret_access_key=secret_key)
table2 = Table(tablename)
item2 = table2.get_item(hashkey=lookup)
print "DB2 item :: ", item2

这是输出。请注意，旧的 dynamo 调用会返回该项目，而不是 boto.dynamodb2 版本。

DB1 item ::  {'hashkey': 'hash1', 'value': 1}
Traceback (most recent call last):
  File "bototest.py", line 18, in <module>
    item2 = table2.get_item(hashkey=lookup)
  File "/usr/local/lib/python2.7/dist-packages/boto-2.31.0-py2.7.egg/boto/dynamodb2/table.py", line 502, in get_item
    consistent_read=consistent
  File "/usr/local/lib/python2.7/dist-packages/boto-2.31.0-py2.7.egg/boto/dynamodb2/layer1.py", line 911, in get_item
    body=json.dumps(params))
  File "/usr/local/lib/python2.7/dist-packages/boto-2.31.0-py2.7.egg/boto/dynamodb2/layer1.py", line 2100, in make_request
    retry_handler=self._retry_handler)
  File "/usr/local/lib/python2.7/dist-packages/boto-2.31.0-py2.7.egg/boto/connection.py", line 940, in _mexe
    status = retry_handler(response, i, next_sleep)
  File "/usr/local/lib/python2.7/dist-packages/boto-2.31.0-py2.7.egg/boto/dynamodb2/layer1.py", line 2143, in _retry_handler
    data)
boto.exception.JSONResponseError: JSONResponseError: 400 Bad Request
{u'message': u'The security token included in the request is invalid.', u'__type': u'com.amazon.coral.service#UnrecognizedClientException'}

Answer 1

创建表对象时必须提供连接：

table2 = Table(tablename, connection=conn2)