Created
July 17, 2024 21:34
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Atomic counter using AWS, Typescript/Node + AWS
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| // ATOMIC COUNTER | |
| // no other operations can happen before or after state of the data being modified | |
| const updateParams: DocumentClient.UpdateItemInput = { | |
| TableName: GENERIC_TABLE, | |
| Key: { pk: `ORG#${organizationId}`, sk: `USER#${userId}` }, | |
| ReturnValues: 'UPDATED_NEW', | |
| UpdateExpression: 'SET #itemCounter = if_not_exists(#itemCounter, :start) + :inc, #activeItems = if_not_exists(#activeItems, :start) + :inc', | |
| ExpressionAttributeNames: { | |
| '#itemCounter': 'itemCounter', | |
| '#activeItems': 'activeItems' | |
| }, | |
| ExpressionAttributeValues: { | |
| ':inc': 1, | |
| ':start': 0 | |
| } | |
| }; | |
| const updateResult = await dynamo.update(updateParams).promise(); |
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