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feat(lambda-event-sources) add DynamoEventSource (#1563)
Add a Dynamo EventSource for consuming a table's stream from Lambda.
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Sam Goodwin
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Jan 23, 2019
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43 changes: 43 additions & 0 deletions
43
packages/@aws-cdk/aws-lambda-event-sources/lib/dynamodb.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,43 @@ | ||
| import dynamodb = require('@aws-cdk/aws-dynamodb'); | ||
| import lambda = require('@aws-cdk/aws-lambda'); | ||
|
|
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| export interface DynamoEventSourceProps { | ||
| /** | ||
| * The largest number of records that AWS Lambda will retrieve from your event | ||
| * source at the time of invoking your function. Your function receives an | ||
| * event with all the retrieved records. | ||
| * | ||
| * Valid Range: Minimum value of 1. Maximum value of 1000. | ||
| * | ||
| * @default 100 | ||
| */ | ||
| batchSize?: number; | ||
|
|
||
| /** | ||
| * Where to begin consuming the DynamoDB stream. | ||
| */ | ||
| startingPosition: lambda.StartingPosition; | ||
| } | ||
|
|
||
| /** | ||
| * Use an Amazon DynamoDB stream as an event source for AWS Lambda. | ||
| */ | ||
| export class DynamoEventSource implements lambda.IEventSource { | ||
| constructor(private readonly table: dynamodb.Table, private readonly props: DynamoEventSourceProps) { | ||
| if (this.props.batchSize !== undefined && (this.props.batchSize < 1 || this.props.batchSize > 1000)) { | ||
| throw new Error(`Maximum batch size must be between 1 and 1000 inclusive (given ${this.props.batchSize})`); | ||
| } | ||
| } | ||
|
|
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| public bind(target: lambda.FunctionBase) { | ||
| new lambda.EventSourceMapping(target, `DynamoDBEventSource:${this.table.node.uniqueId}`, { | ||
| target, | ||
| batchSize: this.props.batchSize || 100, | ||
| eventSourceArn: this.table.tableStreamArn, | ||
| startingPosition: this.props.startingPosition | ||
| }); | ||
|
|
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| this.table.grantStreamRead(target.role); | ||
| dynamodb.Table.grantListStreams(target.role); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,3 +1,4 @@ | ||
| export * from './dynamodb'; | ||
| export * from './kinesis'; | ||
| export * from './sqs'; | ||
| export * from './s3'; | ||
|
|
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130 changes: 130 additions & 0 deletions
130
packages/@aws-cdk/aws-lambda-event-sources/test/integ.dynamodb.expected.json
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,130 @@ | ||
| { | ||
| "Resources": { | ||
| "FServiceRole3AC82EE1": { | ||
| "Type": "AWS::IAM::Role", | ||
| "Properties": { | ||
| "AssumeRolePolicyDocument": { | ||
| "Statement": [ | ||
| { | ||
| "Action": "sts:AssumeRole", | ||
| "Effect": "Allow", | ||
| "Principal": { | ||
| "Service": "lambda.amazonaws.com" | ||
| } | ||
| } | ||
| ], | ||
| "Version": "2012-10-17" | ||
| }, | ||
| "ManagedPolicyArns": [ | ||
| { | ||
| "Fn::Join": [ | ||
| "", | ||
| [ | ||
| "arn:", | ||
| { | ||
| "Ref": "AWS::Partition" | ||
| }, | ||
| ":iam::aws:policy/service-role/AWSLambdaBasicExecutionRole" | ||
| ] | ||
| ] | ||
| } | ||
| ] | ||
| } | ||
| }, | ||
| "FServiceRoleDefaultPolicy17A19BFA": { | ||
| "Type": "AWS::IAM::Policy", | ||
| "Properties": { | ||
| "PolicyDocument": { | ||
| "Statement": [ | ||
| { | ||
| "Action": [ | ||
| "dynamodb:DescribeStream", | ||
| "dynamodb:GetRecords", | ||
| "dynamodb:GetShardIterator" | ||
| ], | ||
| "Effect": "Allow", | ||
| "Resource": { | ||
| "Fn::GetAtt": [ | ||
| "TD925BC7E", | ||
| "StreamArn" | ||
| ] | ||
| } | ||
| }, | ||
| { | ||
| "Action": "dynamodb:ListStreams", | ||
| "Effect": "Allow", | ||
| "Resource": "*" | ||
| } | ||
| ], | ||
| "Version": "2012-10-17" | ||
| }, | ||
| "PolicyName": "FServiceRoleDefaultPolicy17A19BFA", | ||
| "Roles": [ | ||
| { | ||
| "Ref": "FServiceRole3AC82EE1" | ||
| } | ||
| ] | ||
| } | ||
| }, | ||
| "FC4345940": { | ||
| "Type": "AWS::Lambda::Function", | ||
| "Properties": { | ||
| "Code": { | ||
| "ZipFile": "exports.handler = async function handler(event) {\n console.log('event:', JSON.stringify(event, undefined, 2));\n return { event };\n}" | ||
| }, | ||
| "Handler": "index.handler", | ||
| "Role": { | ||
| "Fn::GetAtt": [ | ||
| "FServiceRole3AC82EE1", | ||
| "Arn" | ||
| ] | ||
| }, | ||
| "Runtime": "nodejs8.10" | ||
| }, | ||
| "DependsOn": [ | ||
| "FServiceRole3AC82EE1", | ||
| "FServiceRoleDefaultPolicy17A19BFA" | ||
| ] | ||
| }, | ||
| "FDynamoDBEventSourcelambdaeventsourcedynamodbT7967476AE652DA48": { | ||
| "Type": "AWS::Lambda::EventSourceMapping", | ||
| "Properties": { | ||
| "EventSourceArn": { | ||
| "Fn::GetAtt": [ | ||
| "TD925BC7E", | ||
| "StreamArn" | ||
| ] | ||
| }, | ||
| "FunctionName": { | ||
| "Ref": "FC4345940" | ||
| }, | ||
| "BatchSize": 5, | ||
| "StartingPosition": "TRIM_HORIZON" | ||
| } | ||
| }, | ||
| "TD925BC7E": { | ||
| "Type": "AWS::DynamoDB::Table", | ||
| "Properties": { | ||
| "KeySchema": [ | ||
| { | ||
| "AttributeName": "id", | ||
| "KeyType": "HASH" | ||
| } | ||
| ], | ||
| "AttributeDefinitions": [ | ||
| { | ||
| "AttributeName": "id", | ||
| "AttributeType": "S" | ||
| } | ||
| ], | ||
| "ProvisionedThroughput": { | ||
| "ReadCapacityUnits": 5, | ||
| "WriteCapacityUnits": 5 | ||
| }, | ||
| "StreamSpecification": { | ||
| "StreamViewType": "NEW_IMAGE" | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } |
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