convert-lambda-to-express/dist/wrapLambda.js

Wrapper to run lambda on express. Works great for running lambdas as an express server during development but is production ready. Developed to work in conjunction with matthewkeil/full-stack-pattern cdk construct.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.wrapLambda = exports.getCredentials = void 0;
const aws_sdk_1 = require("aws-sdk");
const Context_1 = require("./Context");
const Event_1 = require("./Event");
const convertResponse_1 = require("./convertResponse");
const runHandler_1 = require("./runHandler");
function getCredentials(filename, profile) {
    var _a, _b;
    if (filename) {
        const credentials = new aws_sdk_1.SharedIniFileCredentials({ filename, profile });
        if (!!credentials.accessKeyId && !!credentials.secretAccessKey) {
            return credentials;
        }
    }
    if (((_a = process.env.AWS_ACCESS_KEY_ID) === null || _a === void 0 ? void 0 : _a.length) && ((_b = process.env.AWS_SECRET_ACCESS_KEY) === null || _b === void 0 ? void 0 : _b.length)) {
        return new aws_sdk_1.Credentials({
            accessKeyId: process.env.AWS_ACCESS_KEY_ID,
            secretAccessKey: process.env.AWS_SECRET_ACCESS_KEY,
            sessionToken: process.env.AWS_SESSION_TOKEN
        });
    }
}
exports.getCredentials = getCredentials;
function wrapLambda(handler, options = {}) {
    var _a, _b;
    const logger = (_a = options.logger) !== null && _a !== void 0 ? _a : console;
    const credentials = getCredentials((_b = options.credentialsFilename) !== null && _b !== void 0 ? _b : '~/.aws/credentials', options.profile);
    return async (req, res, next) => {
        try {
            const startTime = Date.now();
            const context = new Context_1.Context({
                ...options,
                startTime,
                credentials
            });
            const event = new Event_1.Event({
                ...options,
                req,
                startTime,
                awsRequestId: context.awsRequestId,
                accountId: context._accountId
            });
            const convertResponse = (0, convertResponse_1.convertResponseFactory)({ res, logger, options });
            await (0, runHandler_1.runHandler)({
                logger,
                handler,
                event,
                context,
                callback: convertResponse
            });
        }
        catch (err) {
            // if server error building Event, Context or convertResponse
            return next(err);
        }
    };
}
exports.wrapLambda = wrapLambda;