Prevent Duplicate Submissions with Redis

1 year ago
Sophia Anderson
1 minute

To prevent duplicate submissions, you can use Redis transaction mechanism and atomic operations. Here is a common approach:

  1. Utilize Redis’ transaction mechanism and WATCH command to achieve atomic operations. By using the WATCH command to monitor one or more keys, the transaction will fail if another client modifies these keys. Prior to executing the transaction, you can use the GET command to retrieve the value of the key, perform operations within the transaction, and finally use the EXEC command to commit the transaction.
WATCH key
value = GET key
if value == expected_value:
    MULTI
    # 在事务中进行操作
    EXEC
else:
    UNWATCH
  1. The SETNX command in Redis can be used to set a key’s value only if the key does not already exist. This feature can be utilized to prevent duplicate submission of operations.
if SETNX key "1":
    # 设置成功，进行操作
else:
    # 键已存在，说明操作已经提交过了

By using the above method, it is possible to effectively prevent duplicate submission operations, ensuring that each operation is only executed once. Additionally, it can also be strengthened by combining it with setting expiration times and other operations.

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