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index.js
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'use strict';
const getMskClusterNameToken = require('./get-msk-cluster-name-token');
class AwsCompileMSKEvents {
constructor(serverless) {
this.serverless = serverless;
this.provider = this.serverless.getProvider('aws');
this.hooks = {
'package:compileEvents': this.compileMSKEvents.bind(this),
};
this.serverless.configSchemaHandler.defineFunctionEvent('aws', 'msk', {
type: 'object',
properties: {
arn: {
anyOf: [
{ $ref: '#/definitions/awsArnString' },
{ $ref: '#/definitions/awsCfImport' },
{ $ref: '#/definitions/awsCfRef' },
],
},
batchSize: {
type: 'number',
minimum: 1,
maximum: 10000,
},
maximumBatchingWindow: {
type: 'number',
minimum: 0,
maximum: 300,
},
enabled: {
type: 'boolean',
},
startingPosition: {
type: 'string',
enum: ['LATEST', 'TRIM_HORIZON'],
},
topic: {
type: 'string',
},
saslScram512: { $ref: '#/definitions/awsArnString' },
consumerGroupId: {
type: 'string',
maxLength: 200,
pattern: '[a-zA-Z0-9-/*:_+=.@-]*',
},
},
additionalProperties: false,
required: ['arn', 'topic'],
});
}
compileMSKEvents() {
this.serverless.service.getAllFunctions().forEach((functionName) => {
const functionObj = this.serverless.service.getFunction(functionName);
const cfTemplate = this.serverless.service.provider.compiledCloudFormationTemplate;
// It is required to add the following statement in order to be able to connect to MSK cluster
const ec2Statement = {
Effect: 'Allow',
Action: [
'ec2:CreateNetworkInterface',
'ec2:DescribeNetworkInterfaces',
'ec2:DescribeVpcs',
'ec2:DeleteNetworkInterface',
'ec2:DescribeSubnets',
'ec2:DescribeSecurityGroups',
],
Resource: '*',
};
const mskStatement = {
Effect: 'Allow',
Action: ['kafka:DescribeCluster', 'kafka:GetBootstrapBrokers'],
Resource: [],
};
functionObj.events.forEach((event) => {
if (event.msk) {
const eventSourceArn = event.msk.arn;
const topic = event.msk.topic;
const batchSize = event.msk.batchSize;
const maximumBatchingWindow = event.msk.maximumBatchingWindow;
const enabled = event.msk.enabled;
const startingPosition = event.msk.startingPosition || 'TRIM_HORIZON';
const saslScram512 = event.msk.saslScram512;
const consumerGroupId = event.msk.consumerGroupId;
const mskClusterNameToken = getMskClusterNameToken(eventSourceArn);
const mskEventLogicalId = this.provider.naming.getMSKEventLogicalId(
functionName,
mskClusterNameToken,
topic
);
const dependsOn = this.provider.resolveFunctionIamRoleResourceName(functionObj) || [];
const lambdaLogicalId = this.provider.naming.getLambdaLogicalId(functionName);
const mskResource = {
Type: 'AWS::Lambda::EventSourceMapping',
DependsOn: dependsOn,
Properties: {
EventSourceArn: eventSourceArn,
FunctionName: {
'Fn::GetAtt': [lambdaLogicalId, 'Arn'],
},
StartingPosition: startingPosition,
Topics: [topic],
},
};
if (batchSize) {
mskResource.Properties.BatchSize = batchSize;
}
if (maximumBatchingWindow) {
mskResource.Properties.MaximumBatchingWindowInSeconds = maximumBatchingWindow;
}
if (consumerGroupId) {
mskResource.Properties.AmazonManagedKafkaEventSourceConfig = {
ConsumerGroupId: consumerGroupId,
};
}
if (enabled != null) {
mskResource.Properties.Enabled = enabled;
}
if (saslScram512 != null) {
const secureAccessConfigurations = [
{
Type: 'SASL_SCRAM_512_AUTH',
URI: saslScram512,
},
];
mskResource.Properties.SourceAccessConfigurations = secureAccessConfigurations;
}
mskStatement.Resource.push(eventSourceArn);
cfTemplate.Resources[mskEventLogicalId] = mskResource;
}
});
if (cfTemplate.Resources.IamRoleLambdaExecution) {
const statement =
cfTemplate.Resources.IamRoleLambdaExecution.Properties.Policies[0].PolicyDocument
.Statement;
if (mskStatement.Resource.length) {
statement.push(mskStatement);
statement.push(ec2Statement);
}
}
});
}
}
module.exports = AwsCompileMSKEvents;