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import { RStreamsSdk } from "leo-sdk";
import { BatchOptions, ReadOptions } from "../lib/lib";
import { Context, Callback, Handler } from "aws-lambda";
import { CredentialProviderChain } from "aws-sdk";
import { ConfigProviderChain, EnvironmentConfiguration } from "../lib/rstreams";
export interface RStreamsSimpleOptions {
readOptions?: ReadOptions;
batchOptions: BatchOptions;
}
export type RStreamsHandler<T> = Handler<RStreamsEvent<T>, void>;
export type GenericHandler = Handler<any, void>;
export interface RStreamsRecordPayload<T> {
approximateArrivalTimestamp: number;
data: T;
rstreamsSchemaVersion: string;
//partitionKey: string;
sequenceNumber: string;
}
export interface RStreamsEventRecord<T> {
awsRegion: string;
eventID: string;
eventName: string;
eventSource: string;
eventSourceARN: string;
eventVersion: string;
invokeIdentityArn: string;
rstreams: RStreamsRecordPayload<T>;
}
export interface RStreamsEvent<T> {
Records: RStreamsEventRecord<T>[];
}
export default function <T>(options: RStreamsSimpleOptions, functionHandler: RStreamsHandler<T>): GenericHandler {
// TODO: is this a useful shortcut anymore? It parse stringified JSON from the ENV 'Resources'
(process as any).resources = process.env.Resources && JSON.parse(process.env.Resources) || {};
// TODO: How do we get the leo-sdk config
// Currently it is via the leo-config npm module that needs to be bootstrapped
// - ENV?
// - Passed In?
// - Something like CredentialsProviderChain?
let chain = new ConfigProviderChain();
let cpc = new CredentialProviderChain();
const logger = require('leo-logger')('kinesis-like.wrapper');
let leosdk: RStreamsSdk = null;
let ls = null;// = leosdk.streams;
let busName = null
return async function handler(invokeEvent, context: Context) {
// Lazy init because of async
if (leosdk == null) {
// let d = await cpc.resolvePromise();
// console.log(d.accessKeyId);
let config = await chain.resolvePromise();
leosdk = require("../index.js")(
{
Region: config.Region,
LeoStream: config.LeoStream,
LeoCron: config.LeoCron,
LeoEvent: config.LeoEvent,
LeoS3: config.LeoS3,
LeoKinesisStream: config.LeoKinesisStream,
LeoFirehoseStream: config.LeoFirehoseStream,
LeoSettings: config.LeoSettings,
}
);
ls = leosdk.streams;
// Pull the bus name from the sdk config
busName = leosdk.configuration.resources.LeoKinesisStream.split(/-LeoKinesisStream-/)[0];
console.log(leosdk.configuration);
}
process.exit();
// Keeps lambda from hanging with persistent db connections
context.callbackWaitsForEmptyEventLoop = false;
// If bot id is not specified try and pull it from a few places
invokeEvent.botId = invokeEvent.botId || (invokeEvent.__cron || {}).id || process.env.AWS_LAMBDA_FUNCTION_NAME;
const stopTime = Date.now() + context.getRemainingTimeInMillis() * 0.8;
const readSettings: ReadOptions = Object.assign({
start: undefined, // Defaults to bot's last position
stopTime: stopTime,
loops: Number.POSITIVE_INFINITY,
limit: Number.POSITIVE_INFINITY,
size: Number.POSITIVE_INFINITY,
fast_s3_read: true
}, options.readOptions, invokeEvent.readOptions)
const batchOptions: BatchOptions = Object.assign({
// TODO: Are there good batching defaults?
}, options.batchOptions, invokeEvent.batchOptions);
// Counters to keep track of stats
let counters = {
batches: 0,
events: 0
};
return new Promise((resolve, reject) => {
ls.pipe(
leosdk.read(invokeEvent.botId, invokeEvent.queue, readSettings), // Read events from the bus
ls.batch(batchOptions), // Batch up the events into the requested chunks
ls.through(async (batchEvent, done) => {
// If we are after the stopTime skip any read but not processed batches
if (Date.now() > stopTime) {
return done();
}
let handlerError;
try {
if (!batchEvent.payload || batchEvent.payload.length == 0) {
throw new Error("Batch with no events");
}
// Convert the data into a batch to process
let recordsEvent: RStreamsEvent<T> = mapEventsToRStreamsEvent<T>(
batchEvent,
leosdk.configuration.region,
"",// TODO: Do we have an identityARN that is useful
busName
);
await functionHandler(recordsEvent, context, undefined as unknown as Callback<void>);
} catch (err) {
handlerError = err;
}
if (handlerError == null) {
// Checkpoint the batch
// Get the last eid & source_timestamp
let lastEvent = batchEvent.payload[batchEvent.payload.length - 1];
if (lastEvent == null || !lastEvent.eid) {
return done(new Error("No eid found to checkpoint"));
}
leosdk.bot.checkpoint(invokeEvent.botId, invokeEvent.queue, {
eid: lastEvent.eid,
source_timestamp: lastEvent.source_timestamp,
units: batchEvent.payload.length
}, (checkpointError) => {
// Only add stats for things that processed and checkpointed successfully
if (checkpointError == null) {
counters.batches++;
counters.events += batchEvent.payload.length;
}
done(checkpointError);
});
} else {
done(handlerError)
}
}),
ls.devnull(),
(err) => {
logger.log(`Batch Stats: ${JSON.stringify(counters)}`);
err ? reject(err) : resolve(undefined);
}
)
});
}
}
function mapEventsToRStreamsEvent<T>(batchEvent, region: string, identityArn: string, bus: string): RStreamsEvent<T> {
return {
Records: batchEvent.payload.map(data => {
return {
awsRegion: region,
eventID: data.eid,
eventName: "chb:rstreams:record",
eventSource: "chb:rstreams",
eventSourceARN: `${bus}:${data.event}:`,
eventVersion: "2.0",
invokeIdentityArn: identityArn,
rstreams: {
approximateArrivalTimestamp: data.timestamp,
data: data.payload as T,
rstreamsSchemaVersion: "2.0",
//partitionKey: string,
sequenceNumber: data.eid,
} as RStreamsRecordPayload<T>
} as RStreamsEventRecord<T>
})
}
}
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