@darlean/webgateways-suite
Version:
Web Gateways Suite that acts as Web/API Gateway that invokes actors to serve HTTP requests
180 lines (179 loc) • 8.38 kB
JavaScript
;
var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
return c > 3 && r && Object.defineProperty(target, key, r), r;
};
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.WebGatewayActor = void 0;
const base_1 = require("@darlean/base");
const utils_1 = require("@darlean/utils");
const http_1 = require("http");
const url_1 = __importDefault(require("url"));
const querystring_1 = __importDefault(require("querystring"));
const http_graceful_shutdown_1 = __importDefault(require("http-graceful-shutdown"));
const path_prefix_matcher_1 = require("./path-prefix-matcher");
const MAX_BODY_LENGTH = 100 * 1000;
class WebGatewayActor {
constructor(config) {
this.config = config;
this.pathMatchers = [];
for (const handler of this.config.handlers) {
this.pathMatchers.push(handler.path ? new path_prefix_matcher_1.PathPrefixMatcher(handler.path) : undefined);
}
const server = (0, http_1.createServer)((req, res) => {
setImmediate(async () => {
await this.handleRequest(req, res);
});
});
server.keepAliveTimeout = config.keepAliveTimeout;
this.server = server;
this.close = (0, http_graceful_shutdown_1.default)(this.server, {
forceExit: false,
signals: '',
timeout: 10000
});
}
async activate() {
const port = this.config.port ?? 80;
this.port = port;
this.server.listen(port);
(0, utils_1.notifier)().info('io.darlean.webgateways.Listening', 'Web gateway [Name] is now listening on port [Port]', () => ({
Name: this.config.name,
Port: port
}));
}
async deactivate() {
if (this.port) {
// When calling server.close or even server.closeAllConnections, connections with keep-alive open
// (for example, those when used for long-polling) are not actively ended. See https://github.com/nodejs/node/issues/2642.
// The graceful-http library solves this.
await this.close();
}
(0, utils_1.notifier)().info('io.darlean.webgateways.StoppedListening', 'Web gateway [Name] stopped listening on port [Port]', () => ({
Name: this.config.name,
Port: this.port
}));
}
async touch() {
//
}
async handleRequest(req, res) {
try {
const urlobj = new url_1.default.URL(req.url ?? '', 'http://' + req.headers.host);
for (let handlerIdx = 0; handlerIdx < this.config.handlers.length; handlerIdx++) {
const handler = this.config.handlers[handlerIdx];
if (!!handler.method && handler.method !== req.method) {
continue;
}
let remainingPath;
const matcher = this.pathMatchers[handlerIdx];
if (matcher) {
remainingPath = matcher.match(urlobj.pathname);
if (remainingPath === undefined) {
continue;
}
}
if (handler.flow) {
switch (handler.flow.action) {
case 'continue': {
continue;
}
case 'break': {
res.statusCode = handler.flow.statusCode ?? 404;
res.statusMessage = handler.flow.statusMessage ?? 'File not Found';
res.end();
return;
}
}
}
const buffers = [];
let len = 0;
for await (const data of req) {
const buf = data;
len += buf.length;
const maxContentLength = handler.maxContentLength ?? this.config.maxContentLength ?? MAX_BODY_LENGTH;
if (len > maxContentLength) {
// We break the iteration over the request data. When we do not destroy the request, request.socket becomes
// null by NodeJS, and this gives errors in the graceful shutdown library.
// See https://github.com/nodejs/undici/issues/1115
req.destroy();
res.statusCode = 413;
res.statusMessage = 'Payload too large';
res.end();
return;
}
buffers.push(data);
}
const finalBuffer = Buffer.concat(buffers);
const request = {
url: req.url ?? '',
hostname: decodeURIComponent(urlobj.hostname),
port: parseInt(urlobj.port),
protocol: urlobj.protocol,
username: decodeURIComponent(urlobj.username),
method: req.method,
headers: {},
path: urlobj.pathname,
pathRemainder: remainingPath,
body: finalBuffer
};
if (urlobj.search) {
const qs = querystring_1.default.parse(urlobj.search.substring(1));
const queryString = {};
for (const [key, value] of Object.entries(qs)) {
const v = typeof value === 'string' ? [value] : value ? value : [];
queryString[decodeURIComponent(key)] = v.map((x) => decodeURIComponent(x));
}
request.searchParams = queryString;
}
if (request.headers) {
for (const [header, value] of Object.entries(req.headers)) {
if (typeof value === 'string') {
request.headers[header] = value;
}
}
}
if (req.headers?.cookie) {
request.cookies = [];
for (const cookie of req.headers.cookie.split(';')) {
request.cookies.push(cookie.trim());
}
}
const response = await handler.action(request);
res.statusCode = response.statusCode;
res.statusMessage = response.statusMessage;
if (response.headers) {
for (const [header, value] of Object.entries(response.headers)) {
res.setHeader(header, value);
}
}
if (response.cookies) {
for (const cookie of response.cookies) {
res.setHeader('set-cookie', cookie);
}
}
res.write(response.body);
res.end();
return;
}
res.statusCode = 404;
res.statusMessage = 'File not Found';
res.end();
}
catch (e) {
(0, utils_1.notifier)().warning('io.darlean.webgateways.ProcessingFailed', 'An error occurred during processing of web gateway request: [Error]', () => ({ Error: e }));
res.statusCode = 500;
res.statusMessage = 'Internal server error';
res.end();
}
}
}
__decorate([
(0, base_1.action)()
], WebGatewayActor.prototype, "touch", null);
exports.WebGatewayActor = WebGatewayActor;