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@mayurajs/storage-dynamodb

v1.2.0

Published

Mayura storage on Amazon DynamoDB, as optimistic transactions through the official AWS SDK.

Readme

@mayurajs/storage-dynamodb

Mayura storage on Amazon DynamoDB, through the official AWS SDK: everything the SQL stores keep, in one table.

npm install mayura @mayurajs/storage-dynamodb
import { createDynamoStore } from '@mayurajs/storage-dynamodb';

const store = createDynamoStore({ table: 'mayura', region: 'us-east-1', credentials });
await store.initialize();
  • The table has a string partition key p and string sort key s. createTable: true creates it (on-demand capacity) when it is missing; nothing is created otherwise.
  • Region and credentials are options: nothing is read from the environment, AWS config files or instance metadata. Requests go through fetch, so the store runs wherever fetch does. Or pass a DynamoDBClient you own as client.
  • Mayura's state machines run as optimistic transactions: each reads consistently, holds its writes, and commits one TransactWriteItems that applies only if nothing it locked or wrote changed; otherwise it runs again.
  • DynamoDB has no clock to read: leases use your hosts' clocks, so keep them synchronized. Documents over 400 KB are split into chunk items; an operation that needs more than DynamoDB's 100 items per transaction fails whole with LIMIT_EXCEEDED.

See the storage guide. Apache-2.0.