@aws-cdk/aws-dynamodb
Version:
The CDK Construct Library for AWS::DynamoDB
72 lines • 11.3 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.isCompleteHandler = exports.onEventHandler = void 0;
const aws_sdk_1 = require("aws-sdk"); // eslint-disable-line import/no-extraneous-dependencies
async function onEventHandler(event) {
console.log('Event: %j', { ...event, ResponseURL: '...' });
const dynamodb = new aws_sdk_1.DynamoDB();
const tableName = event.ResourceProperties.TableName;
const region = event.ResourceProperties.Region;
let updateTableAction;
if (event.RequestType === 'Create' || event.RequestType === 'Delete') {
updateTableAction = event.RequestType;
}
else { // Update
// There are two cases where an Update can happen:
// 1. A table replacement. In that case, we need to create the replica in the new Table
// (the replica for the "old" Table will be deleted when CFN issues a Delete event on the old physical resource id).
// 2. A customer has changed one of the properties of the Custom Resource,
// like 'waitForReplicationToFinish'. In that case, we don't have to do anything.
// To differentiate the two cases, we make an API call to DynamoDB to check whether a replica already exists.
const describeTableResult = await dynamodb.describeTable({
TableName: tableName,
}).promise();
console.log('Describe table: %j', describeTableResult);
const replicaExists = describeTableResult.Table?.Replicas?.some(replica => replica.RegionName === region);
updateTableAction = replicaExists ? undefined : 'Create';
}
if (updateTableAction) {
const data = await dynamodb.updateTable({
TableName: tableName,
ReplicaUpdates: [
{
[updateTableAction]: {
RegionName: region,
},
},
],
}).promise();
console.log('Update table: %j', data);
}
else {
console.log("Skipping updating Table, as a replica in '%s' already exists", region);
}
return event.RequestType === 'Create' || event.RequestType === 'Update'
? { PhysicalResourceId: `${tableName}-${region}` }
: {};
}
exports.onEventHandler = onEventHandler;
async function isCompleteHandler(event) {
console.log('Event: %j', { ...event, ResponseURL: '...' });
const dynamodb = new aws_sdk_1.DynamoDB();
const data = await dynamodb.describeTable({
TableName: event.ResourceProperties.TableName,
}).promise();
console.log('Describe table: %j', data);
const tableActive = data.Table?.TableStatus === 'ACTIVE';
const replicas = data.Table?.Replicas ?? [];
const regionReplica = replicas.find(r => r.RegionName === event.ResourceProperties.Region);
const replicaActive = regionReplica?.ReplicaStatus === 'ACTIVE';
const skipReplicationCompletedWait = event.ResourceProperties.SkipReplicationCompletedWait === 'true';
switch (event.RequestType) {
case 'Create':
case 'Update':
// Complete when replica is reported as ACTIVE
return { IsComplete: tableActive && (replicaActive || skipReplicationCompletedWait) };
case 'Delete':
// Complete when replica is gone
return { IsComplete: tableActive && regionReplica === undefined };
}
}
exports.isCompleteHandler = isCompleteHandler;
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