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index.ts
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index.ts
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import { Construct, Duration } from "@aws-cdk/core";
import * as sqs from "@aws-cdk/aws-sqs";
import * as events from "@aws-cdk/aws-events";
import * as events_targets from "@aws-cdk/aws-events-targets";
import * as lambda from "@aws-cdk/aws-lambda";
import * as lambda_event_sources from "@aws-cdk/aws-lambda-event-sources";
import * as dynamodb from "@aws-cdk/aws-dynamodb";
import * as path from "path";
import { StateMachine } from "@aws-cdk/aws-stepfunctions";
export enum EventLoggingLevel {
FULL = "FULL",
SUMMARY = "SUMMARY"
}
export enum Datastore {
DYNAMODB = "Dynamodb",
POSTGRES = "Postgres"
}
export interface EventLoggerBaseProps {
readonly stepfunctions: Array<StateMachine>
}
export interface EventLoggerCustomLambdaProps extends EventLoggerBaseProps {
readonly lambda: lambda.Function
}
export interface EventLoggerStandardLambdaProps extends EventLoggerBaseProps {
readonly eventLoggingLevel: EventLoggingLevel
readonly datastore: Datastore
// readonly dynamodbSettings?: DynamodbSettings
}
export class StepFunctionEventLogger extends Construct {
constructor(scope: Construct, id: string, props: EventLoggerStandardLambdaProps | EventLoggerCustomLambdaProps) {
super(scope, id);
function isCustomLambda(props: EventLoggerStandardLambdaProps | EventLoggerCustomLambdaProps): props is EventLoggerCustomLambdaProps {
return (props as EventLoggerCustomLambdaProps).lambda !== undefined
};
const deadLetterQueue = new sqs.Queue(
this, "EventLoggerDeadLetterQueue", {
retentionPeriod: Duration.days(14)
});
const mainQueue = new sqs.Queue(
this, "EventLoggingQueue", {
deadLetterQueue: {
maxReceiveCount: 6,
queue: deadLetterQueue
},
retentionPeriod: Duration.days(1),
visibilityTimeout: Duration.minutes(1)
});
var stepfunctionArns = Array<string>();
props.stepfunctions.forEach(sf => {
stepfunctionArns.push(sf.stateMachineArn)
});
new events.Rule(
this, "EventNotificationToSQSRule",
{
ruleName: "SendNewStepFunctionEventToQueue",
description: "Captures status changed events from StepFunction and creates a message in SQS",
eventPattern: {
detail: {
status: ["SUCCEEDED", "FAILED", "ABORTED", "TIMED_OUT"],
stateMachineArn: stepfunctionArns
},
detailType: ["Step Functions Execution Status Change"],
source: ["aws.states"],
},
targets: [new events_targets.SqsQueue(mainQueue)]
}
)
const SQSMessageProcessorFunction = isCustomLambda(props) ? props.lambda : this.createMessageProcessorFunction(props.eventLoggingLevel, props.datastore)
// grants message processor lambda permission to consume messages from SQS Queue
mainQueue.grantConsumeMessages(SQSMessageProcessorFunction)
SQSMessageProcessorFunction.addEventSource(new lambda_event_sources.SqsEventSource(mainQueue))
// grants message processor lambda permsisions to read stepfunction execution history
props.stepfunctions.forEach(sf => { sf.grantRead(SQSMessageProcessorFunction) });
}
createMessageProcessorFunction(
eventLoggingLevel: EventLoggingLevel,
datastore: Datastore
) {
const SQSMessageProcessorFunction = new lambda.Function(
this, "SQSMessageProcessorFunction",
{
runtime: lambda.Runtime.PYTHON_3_8,
code: lambda.Code.fromAsset(path.join(__dirname, "lambda")),
handler: "event_logger.handler",
timeout: Duration.minutes(1),
}
);
SQSMessageProcessorFunction.addEnvironment(
"EVENT_LOGGING_LEVEL", eventLoggingLevel
)
SQSMessageProcessorFunction.addEnvironment(
"DATASTORE_TYPE", datastore
)
this.createDatastore(SQSMessageProcessorFunction, datastore, eventLoggingLevel);
return SQSMessageProcessorFunction;
}
createDatastore(
SQSMessageProcessorFunction: lambda.Function,
datastore: Datastore,
loglevel: EventLoggingLevel
) {
if (datastore === Datastore.DYNAMODB) {
const dynamodb_datastore = new dynamodb.Table(
this, "EventsDatastore", {
partitionKey: {
name: "execution_id",
type: dynamodb.AttributeType.STRING
},
sortKey: {
name: "step_id",
type: dynamodb.AttributeType.STRING
},
});
// TODO: make capacity and indexes configurable
dynamodb_datastore.autoScaleReadCapacity({
minCapacity: 5,
maxCapacity: 10000
})
dynamodb_datastore.autoScaleWriteCapacity({
minCapacity: 5,
maxCapacity: 10000
})
if (loglevel === EventLoggingLevel.FULL) {
dynamodb_datastore.addGlobalSecondaryIndex(
{
indexName: "EventType-Timestamp-Index",
partitionKey: {
name: "type",
type: dynamodb.AttributeType.STRING
},
sortKey: {
name: "timestamp",
type: dynamodb.AttributeType.STRING
}
}
)
dynamodb_datastore.autoScaleGlobalSecondaryIndexReadCapacity(
"EventType-Timestamp-Index",
{
minCapacity: 5,
maxCapacity: 10000
}
)
dynamodb_datastore.autoScaleGlobalSecondaryIndexWriteCapacity(
"EventType-Timestamp-Index",
{
minCapacity: 5,
maxCapacity: 10000
}
)
} else if (loglevel === EventLoggingLevel.SUMMARY) {
dynamodb_datastore.addGlobalSecondaryIndex(
{
indexName: "ExecutionStatus-Timestamp-Index",
partitionKey: {
name: "Status",
type: dynamodb.AttributeType.STRING
},
sortKey: {
name: "timestamp",
type: dynamodb.AttributeType.STRING
}
}
)
dynamodb_datastore.autoScaleGlobalSecondaryIndexReadCapacity(
"ExecutionStatus-Timestamp-Index",
{
minCapacity: 5,
maxCapacity: 10000
}
)
dynamodb_datastore.autoScaleGlobalSecondaryIndexWriteCapacity(
"ExecutionStatus-Timestamp-Index",
{
minCapacity: 5,
maxCapacity: 10000
}
)
}
// grants message processor lambda permission to write to DynamoDB
dynamodb_datastore.grantWriteData(SQSMessageProcessorFunction)
SQSMessageProcessorFunction.addEnvironment(
"DATASTORE_ARN", dynamodb_datastore.tableArn
)
} else if (datastore === Datastore.POSTGRES) {
// TODO:
// const postgres_datastore = new ...
// TODO: grant lambda access to postgres_datastore
// datastoreArn = postgres_datastore.tableArn;
};
}
}