@serverless-seoul/dynamorm-stream/dst/stream_handler.js

DynamoDB Stream Framework

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.parseDynamoDBStreamARN = exports.StreamHandler = void 0;
const debug = require("debug");
const logger = debug("@serverless-seoul/dynamorm-stream:StreamHandler");
class StreamHandler {
    constructor(tableHandlers) {
        this.tableHandlerMap = new Map();
        tableHandlers.forEach((handler) => {
            const tableName = handler.tableClass.metadata.name;
            if (this.tableHandlerMap.has(tableName)) {
                throw new Error(`You can't put more than one handler for given table: ${tableName}`);
            }
            this.tableHandlerMap.set(tableName, handler);
        });
    }
    get handler() {
        return async (event) => {
            if (event.Records.length > 0) {
                // Even though each records has own eventSourceARN,
                // one event only has one eventSoruceARN.
                // Thus, select "one" event source arn.
                const sourceARN = event.Records[0].eventSourceARN;
                logger("handler: sourceARN - %s", sourceARN);
                const streamMetadata = parseDynamoDBStreamARN(sourceARN);
                if (!streamMetadata) {
                    throw new Error(`Invalid Source Arn : ${sourceARN}`);
                }
                const handler = this.tableHandlerMap.get(streamMetadata.tableName);
                if (handler) {
                    logger("handler: start table handler: %s", streamMetadata.tableName);
                    await handler.handler(event);
                }
                else {
                    logger("handler: sourceARN - %s, There is no table handler for arn", sourceARN);
                }
            }
        };
    }
    get lambdaHandler() {
        return async (event, context) => {
            context.callbackWaitsForEmptyEventLoop = false;
            return await this.handler(event);
        };
    }
}
exports.StreamHandler = StreamHandler;
/**
 *
 * @param arn
 * @returns - null means invalid arn
 */
// arn:aws:dynamodb:us-east-1:921281748045:table/qna_production_questions/stream/2017-12-22T02:02:25.496
function parseDynamoDBStreamARN(arn) {
    const arnRegex = /arn:aws:dynamodb:(\w+-\w+-\d):(\d+):table\/(\w+)\/stream\/(\S+)/;
    const match = arn.match(arnRegex);
    if (match && match.length === 5) {
        return {
            region: match[1],
            awsAccountId: match[2],
            tableName: match[3],
        };
    }
    else {
        return null;
    }
}
exports.parseDynamoDBStreamARN = parseDynamoDBStreamARN;
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