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packages/@aws-cdk/aws-lambda-event-sources/lib/kafka.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,194 @@ | ||
| import * as crypto from 'crypto'; | ||
| import { ISecurityGroup, IVpc, SubnetSelection } from '@aws-cdk/aws-ec2'; | ||
| import * as iam from '@aws-cdk/aws-iam'; | ||
| import * as lambda from '@aws-cdk/aws-lambda'; | ||
| import * as msk from '@aws-cdk/aws-msk'; | ||
| import * as secretsmanager from '@aws-cdk/aws-secretsmanager'; | ||
| import { Stack } from '@aws-cdk/core'; | ||
| import { StreamEventSource, StreamEventSourceProps } from './stream'; | ||
|
|
||
| // keep this import separate from other imports to reduce chance for merge conflicts with v2-main | ||
| // eslint-disable-next-line no-duplicate-imports, import/order | ||
| import { Construct } from '@aws-cdk/core'; | ||
|
|
||
| /** | ||
| * Properties for a Kafka event source | ||
| */ | ||
| export interface KafkaEventSourceProps extends StreamEventSourceProps { | ||
| /** | ||
| * the Kafka topic to subscribe to | ||
| */ | ||
| readonly topic: string, | ||
| /** | ||
| * the secret with the Kafka credentials, see https://docs.aws.amazon.com/msk/latest/developerguide/msk-password.html for details | ||
| */ | ||
| readonly secret: secretsmanager.ISecret | ||
| } | ||
|
|
||
| /** | ||
| * Properties for a MSK event source | ||
| */ | ||
| export interface ManagedKafkaEventSourceProps extends KafkaEventSourceProps { | ||
| /** | ||
| * an MSK cluster construct | ||
| */ | ||
| readonly cluster: msk.ICluster | ||
| } | ||
|
|
||
| /** | ||
| * The authentication method to use with SelfManagedKafkaEventSource | ||
| */ | ||
| export enum AuthenticationMethod { | ||
| /** | ||
| * SASL_SCRAM_512_AUTH authentication method for your Kafka cluster | ||
| */ | ||
| SASL_SCRAM_512_AUTH = 'SASL_SCRAM_512_AUTH', | ||
| /** | ||
| * SASL_SCRAM_256_AUTH authentication method for your Kafka cluster | ||
| */ | ||
| SASL_SCRAM_256_AUTH = 'SASL_SCRAM_256_AUTH', | ||
| } | ||
|
|
||
| /** | ||
| * Properties for a self managed Kafka cluster event source. | ||
| * If your Kafka cluster is only reachable via VPC make sure to configure it. | ||
| */ | ||
| export interface SelfManagedKafkaEventSourceProps extends KafkaEventSourceProps { | ||
| /** | ||
| * The list of host and port pairs that are the addresses of the Kafka brokers in a "bootstrap" Kafka cluster that | ||
| * a Kafka client connects to initially to bootstrap itself. They are in the format `abc.xyz.com:xxxx`. | ||
| */ | ||
| readonly bootstrapServers: string[] | ||
|
|
||
| /** | ||
| * If your Kafka brokers are only reachable via VPC provide the VPC here | ||
| * | ||
| * @default none | ||
| */ | ||
| readonly vpc?: IVpc; | ||
|
|
||
| /** | ||
| * If your Kafka brokers are only reachable via VPC, provide the subnets selection here | ||
| * | ||
| * @default - none, required if setting vpc | ||
| */ | ||
| readonly vpcSubnets?: SubnetSelection, | ||
|
|
||
| /** | ||
| * If your Kafka brokers are only reachable via VPC, provide the security group here | ||
| * | ||
| * @default - none, required if setting vpc | ||
| */ | ||
| readonly securityGroup?: ISecurityGroup | ||
|
|
||
| /** | ||
| * The authentication method for your Kafka cluster | ||
| * | ||
| * @default AuthenticationMethod.SASL_SCRAM_512_AUTH | ||
| */ | ||
| readonly authenticationMethod?: AuthenticationMethod | ||
| } | ||
|
|
||
| /** | ||
| * Use a MSK cluster as a streaming source for AWS Lambda | ||
| */ | ||
| export class ManagedKafkaEventSource extends StreamEventSource { | ||
| // This is to work around JSII inheritance problems | ||
| private innerProps: ManagedKafkaEventSourceProps; | ||
|
|
||
| constructor(props: ManagedKafkaEventSourceProps) { | ||
| super(props); | ||
| this.innerProps = props; | ||
| } | ||
|
|
||
| public bind(target: lambda.IFunction) { | ||
| target.addEventSourceMapping( | ||
| `KafkaEventSource:${this.innerProps.cluster.clusterArn}${this.innerProps.topic}`, | ||
| this.enrichMappingOptions({ | ||
| eventSourceArn: this.innerProps.cluster.clusterArn, | ||
| startingPosition: this.innerProps.startingPosition, | ||
| // From https://docs.aws.amazon.com/msk/latest/developerguide/msk-password.html#msk-password-limitations, "Amazon MSK only supports SCRAM-SHA-512 authentication." | ||
| sourceAccessConfigurations: [{ type: lambda.SourceAccessConfigurationType.SASL_SCRAM_512_AUTH, uri: this.innerProps.secret.secretArn }], | ||
| kafkaTopic: this.innerProps.topic, | ||
| }), | ||
| ); | ||
|
|
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| this.innerProps.secret.grantRead(target); | ||
|
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| target.addToRolePolicy(new iam.PolicyStatement( | ||
| { | ||
| actions: ['kafka:DescribeCluster', 'kafka:GetBootstrapBrokers', 'kafka:ListScramSecrets'], | ||
| resources: [this.innerProps.cluster.clusterArn], | ||
| }, | ||
| )); | ||
|
|
||
| target.role?.addManagedPolicy(iam.ManagedPolicy.fromAwsManagedPolicyName('service-role/AWSLambdaMSKExecutionRole')); | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * Use a self hosted Kafka installation as a streaming source for AWS Lambda. | ||
| */ | ||
| export class SelfManagedKafkaEventSource extends StreamEventSource { | ||
| // This is to work around JSII inheritance problems | ||
| private innerProps: SelfManagedKafkaEventSourceProps; | ||
|
|
||
| constructor(props: SelfManagedKafkaEventSourceProps) { | ||
| super(props); | ||
| if (props.vpc) { | ||
| if (!props.securityGroup) { | ||
| throw new Error('securityGroup must be set when providing vpc'); | ||
| } | ||
| if (!props.vpcSubnets) { | ||
| throw new Error('vpcSubnets must be set when providing vpc'); | ||
| } | ||
| } | ||
| this.innerProps = props; | ||
| } | ||
|
|
||
| public bind(target: lambda.IFunction) { | ||
| if (!Construct.isConstruct(target)) { throw new Error('Function is not a construct. Unexpected error.'); } | ||
| target.addEventSourceMapping( | ||
| this.mappingId(target), | ||
| this.enrichMappingOptions({ | ||
| kafkaBootstrapServers: this.innerProps.bootstrapServers, | ||
| kafkaTopic: this.innerProps.topic, | ||
| startingPosition: this.innerProps.startingPosition, | ||
| sourceAccessConfigurations: this.sourceAccessConfigurations(), | ||
| }), | ||
| ); | ||
| this.innerProps.secret.grantRead(target); | ||
| } | ||
|
|
||
| private mappingId(target: lambda.IFunction) { | ||
| let hash = crypto.createHash('md5'); | ||
| hash.update(JSON.stringify(Stack.of(target).resolve(this.innerProps.bootstrapServers))); | ||
| const idHash = hash.digest('hex'); | ||
| return `KafkaEventSource:${idHash}:${this.innerProps.topic}`; | ||
| } | ||
|
|
||
| private sourceAccessConfigurations() { | ||
| let authType; | ||
| switch (this.innerProps.authenticationMethod) { | ||
| case AuthenticationMethod.SASL_SCRAM_256_AUTH: | ||
| authType = lambda.SourceAccessConfigurationType.SASL_SCRAM_256_AUTH; | ||
| break; | ||
| case AuthenticationMethod.SASL_SCRAM_512_AUTH: | ||
| default: | ||
| authType = lambda.SourceAccessConfigurationType.SASL_SCRAM_512_AUTH; | ||
| break; | ||
| } | ||
| let sourceAccessConfigurations = [{ type: authType, uri: this.innerProps.secret.secretArn }]; | ||
| if (this.innerProps.vpcSubnets !== undefined && this.innerProps.securityGroup !== undefined) { | ||
| sourceAccessConfigurations.push({ | ||
| type: lambda.SourceAccessConfigurationType.VPC_SECURITY_GROUP, | ||
| uri: this.innerProps.securityGroup.securityGroupId, | ||
| }, | ||
| ); | ||
| this.innerProps.vpc?.selectSubnets(this.innerProps.vpcSubnets).subnetIds.forEach((id) => { | ||
| sourceAccessConfigurations.push({ type: lambda.SourceAccessConfigurationType.VPC_SUBNET, uri: id }); | ||
| }); | ||
| } | ||
| return sourceAccessConfigurations; | ||
| } | ||
| } |
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