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

DynamoDB Stream Framework

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.TableHandler = void 0;
const handler_1 = require("./handler");
class TableHandler {
    constructor(tableClass, strategy = "Series", handlers, catchError) {
        this.tableClass = tableClass;
        this.strategy = strategy;
        this.handlers = handlers;
        this.catchError = catchError;
    }
    get handler() {
        return async (event) => {
            const records = handler_1.parseEvent(this.tableClass, event);
            switch (this.strategy) {
                case "Series":
                    for (const handler of this.handlers) {
                        try {
                            await executeHandler(handler, records);
                        }
                        catch (error) {
                            this.catchError(handler, records, error);
                        }
                    }
                    break;
                case "Map":
                    await Promise.all(this.handlers.map(async (handler) => {
                        try {
                            await executeHandler(handler, records);
                        }
                        catch (error) {
                            this.catchError(handler, records, error);
                        }
                    }));
                    break;
            }
        };
    }
}
exports.TableHandler = TableHandler;
async function executeHandler(handlerDefinition, records) {
    const { handler, filteredRecords } = (() => {
        switch (handlerDefinition.eventType) {
            case "INSERT":
                return {
                    handler: handlerDefinition.handler,
                    filteredRecords: valueFilter(records.map((record) => record.type === "INSERT" ? record : null)),
                };
            case "MODIFY":
                return {
                    handler: handlerDefinition.handler,
                    filteredRecords: valueFilter(records.map((record) => record.type === "MODIFY" ? record : null)),
                };
            case "REMOVE":
                return {
                    handler: handlerDefinition.handler,
                    filteredRecords: valueFilter(records.map((record) => record.type === "REMOVE" ? record : null)),
                };
            case "INSERT, MODIFY":
                return {
                    handler: handlerDefinition.handler,
                    filteredRecords: valueFilter(records.map((record) => record.type === "INSERT" || record.type === "MODIFY" ? record : null)),
                };
            case "MODIFY, REMOVE":
                return {
                    handler: handlerDefinition.handler,
                    filteredRecords: valueFilter(records.map((record) => record.type === "MODIFY" || record.type === "REMOVE" ? record : null)),
                };
            case "INSERT, REMOVE":
                return {
                    handler: handlerDefinition.handler,
                    filteredRecords: valueFilter(records.map((record) => record.type === "INSERT" || record.type === "REMOVE" ? record : null)),
                };
            case "ALL":
                return {
                    handler: handlerDefinition.handler,
                    filteredRecords: valueFilter(records),
                };
        }
    })();
    if (filteredRecords.length > 0) {
        await handler(filteredRecords);
    }
}
function valueFilter(array) {
    const res = [];
    array.forEach((item) => {
        if (item !== undefined && item !== null) {
            res.push(item);
        }
    });
    return res;
}
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