setddblock

setddblock is setlock like command line tool with AWS DynamoDB

Usage

$ setddblock -xN ddb://ddb_lock_table/lock_item_id your_command

Usage: setddblock [ -nNxX ] [--endpoint <endpoint>] [--debug --version] ddb://<table_name>/<item_id> your_command
Flags:
  -n
        No delay. If fn is locked by another process, setlock gives up.
  -N
        (Default.) Delay. If fn is locked by another process, setlock waits until it can obtain a new lock.
  -x
        If fn cannot be update-item (or put-item) or locked, setlock exits zero.
  -X
        (Default.) If fn cannot be update-item (or put-item) or locked, setlock prints an error message and exits nonzero.
  --debug
        show debug log
  --endpoint string
        If you switch remote, set AWS DynamoDB endpoint url.
  --region string
        aws region
  --timeout string
        set command timeout
  --version
        show version

the required IAM Policy is as follows:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "VisualEditor0",
            "Effect": "Allow",
            "Action": [
                "dynamodb:CreateTable",
                "dynamodb:UpdateTimeToLive",
                "dynamodb:PutItem",
                "dynamodb:DescribeTable",
                "dynamodb:GetItem",
                "dynamodb:UpdateItem"
            ],
            "Resource": "*"
        }
    ]
}

If the lock table has already been created, dynamodb:CreateTable and dynamodb:UpdateTimeToLive are not required.

Install

binary packages

Releases.

Homebrew tap

$ brew install mashiike/tap/setddblock

Usage as a library

setddblock.New(url string, optFns ...func(*setddblock.Options)) returns a DynamoDBLocker that satisfies the sync.Locker interface.

l, err := setddblock.New("ddb://ddb_lock_table/lock_item_id")
if err != nil {
	// ...
}
func () {
    l.Lock()
    defer l.Unlock()
    // ...
}()

Note: If Lock or Unlock fails, for example because you can't connect to DynamoDB, it will panic.
If you don't want it to panic, use LockWithError() and UnlockWithErr(). Alternatively, use the WithNoPanic option.

more infomation see go doc.

License

see LICENSE file.