dynamodb lock

Dynamodb based distributed lock implemented in pure Rust. The design is largely inspired by amazon-dynamodb-lock-client.

It is used by the delta-rs project to implement PUT if absence semantic for concurrent S3 writes. It is considered production ready and battle tested through the kafka-delta-ingest project.

Usage

```rust let dynamodbclient = rusotodynamodb::DynamoDbClient::new(rusotocore::Region::default()); let lockclient = dynamodblock::DynamoDbLockClient::new( dynamodbclient, dynamodb_lock::DynamoDbOptions::default(), );

let lockdata = "Moe"; let lock = lockclient.tryacquirelock(lock_data).await?.unwrap();

if lock.acquiredexpiredlock { // error handling when acquired an expired lock }

// do stuff in the critical region

lockclient.releaselock(&lock).await?; ```

For real world example, see https://github.com/delta-io/delta-rs/blob/main/rust/src/storage/s3/mod.rs.