express-lambda/dist/lambda.js

Make AWS lambda behave like an express app

"use strict";

var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

var shell = require("shelljs");
var fs = require("fs");
var path = require("path");
var crypto = require("crypto");
var tmp = require("tmp");
var log = require("./log");

var Lambda = function () {
  function Lambda(config) {
    _classCallCheck(this, Lambda);

    var id = crypto.randomBytes(4).toString("hex").slice(0, 6);
    this.config = config;
    this.built = false;
    this._folder = tmp.dirSync().name + "/" + path.parse(this.config.src).name + "-" + id;
    this.name = path.parse(this.config.src).name + "-" + id + "-" + process.env.AWS_ENVIRONMENT;
  }

  _createClass(Lambda, [{
    key: "build",
    value: function build() {
      if (this.built) {
        log.info("Skipping building lambda " + this.name + "...already built.");
        return this;
      }

      log.info("Building lambda " + this.name);
      shell.exec("mkdir " + this._folder);
      this._writeWrapper();
      shell.exec("cp " + this.config.src + "* " + this._folder);
      shell.exec("cp .env " + this._folder);
      // create package.json and copy dependencies over
      shell.exec("cd " + this._folder + "; npm init -y", { silent: true });
      var depsMain = JSON.parse(fs.readFileSync(process.cwd() + "/" + "package.json"));
      var depsModule = JSON.parse(fs.readFileSync(this._folder + "/package.json"));
      depsModule.dependencies = depsMain.dependencies;
      fs.writeFileSync(this._folder + "/package.json", JSON.stringify(depsModule, null, 2), "utf8");

      // copy node modules
      shell.exec("cp -r " + process.cwd() + "/node_modules " + this._folder);
      this.built = true;
      log.info("Built lambda " + this.name);
      return this;
    }
  }, {
    key: "deploy",
    value: function deploy() {
      if (this.deployed) {
        log.info("Skipping deploying lambda " + this.name + "...already deployed.");
        return this;
      }

      log.info("Deploying lambda " + this.name);
      var nodeLambdaPath = require.resolve("node-lambda/bin/node-lambda");
      shell.exec("cd " + this._folder + "; " + nodeLambdaPath + " deploy", { silent: true });
      this.deployed = true;
      log.info("Deployed lambda " + this.name);
      return this;
    }
  }, {
    key: "_writeWrapper",
    value: function _writeWrapper() {
      var wrapper = "\n      var utils = require(\"express-lambda/dist/utils\");\n\n      exports.handler = function(event, context) {\n        var req = utils.makeRequest(event, context);\n        var res = utils.makeResponse(event, context, req);\n        require(\"./" + path.basename(this.config.src) + "\")(req, res);\n      };";

      fs.writeFileSync(this._folder + "/index.js", wrapper);
    }
  }]);

  return Lambda;
}();

module.exports = Lambda;