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import * as express from 'express';
import * as httpProxy from 'http-proxy';
import * as WebSocket from 'ws';
import * as xml from 'xml';
import { Colors, SOCKET_PORT } from './constants';
import * as logger from './logger';
import { constructHTMLMessage, getRouterPort, isPortTaken, PortError } from './utils';
export interface Routes {
[i: string]: {
url: string;
port: number;
processName: string;
color: Colors;
};
}
export const ACTIONS = {
ADD_ROUTE: 'ADD_ROUTE',
ADD_ROUTES: 'ADD_ROUTES',
REMOVE_ROUTES: 'REMOVE_ROUTES',
};
const globalRoutes: Routes = {};
let app: express.Express;
let expressRouter: express.Router;
let proxy: httpProxy;
export const init = () => {
app = express();
expressRouter = express.Router();
proxy = httpProxy.createServer();
proxy.on('error', (error) => {
logger.log(error.message);
logger.log('Process may still be starting\n');
});
expressRouter.use((req, res) => {
const route = globalRoutes[req.hostname];
let agent = req.headers['user-agent'] || '';
agent = Array.isArray(agent) ? agent.join(' ') : agent;
if (route) {
proxy.web(req, res, {
target: `http://0.0.0.0:${route.port}`,
});
} else {
const message = `Watfish: Unknown host ${req.hostname}`;
res.status(404);
if (req.accepts('html')) {
res.send(constructHTMLMessage(message));
} else if (req.accepts('json')) {
res.json({message});
} else if (req.accepts('xml')) {
res.send(xml({message}));
} else {
res.send(message);
}
}
});
app.use((req, res, next) => {
return expressRouter(req, res, next);
});
};
export const addRoute = (processName: string, color: Colors, url: string, port: number, ws: WebSocket) => {
const routerPort = getRouterPort();
globalRoutes[url] = {
processName,
url,
port,
color,
};
/* istanbul ignore else */
if (ws.readyState === WebSocket.OPEN) {
ws.send(colors[color](`Routing process ${processName} from http://${url}:${routerPort} to port ${port}`));
}
};
export const addRoutes = (routes: Routes, ws: WebSocket) => {
for (const url in routes) {
/* istanbul ignore else */
if (routes.hasOwnProperty(url)) {
const { processName, port, color } = routes[url];
addRoute(processName, color, url, port, ws);
}
}
};
export const removeRoutes = (routes: Routes, ws: WebSocket) => {
const routerPort = getRouterPort();
for (const url in routes) {
/* istanbul ignore else */
if (routes.hasOwnProperty(url)) {
const { processName, port, color } = routes[url];
delete globalRoutes[url];
/* istanbul ignore else */
if (ws.readyState === WebSocket.OPEN) {
ws.send(colors[color](`Removing route ${processName} http://${url}:${routerPort} on port ${port}`));
}
}
}
};
export const startSockets = (port: number, wss: WebSocket.Server) => {
wss.on('connection', (ws) => {
// Listen for messages
ws.on('message', (data) => {
let json;
try {
json = JSON.parse(data.toString());
} catch (error) {
logger.log(`Invalid router action ${data}`);
logger.log(error.message);
return;
}
const { type, payload, payload: { processName, color, url, port: routerPort } } = json;
switch (type) {
case ACTIONS.ADD_ROUTE:
addRoute(processName, color, url, routerPort, ws);
break;
case ACTIONS.ADD_ROUTES:
addRoutes(payload, ws);
break;
case ACTIONS.REMOVE_ROUTES:
removeRoutes(payload, ws);
break;
default:
logger.log(`Unknown router action ${data}`);
break;
}
});
// Send message
/* istanbul ignore else */
if (ws.readyState === WebSocket.OPEN) {
ws.send(`Connected to router on port ${port}\n`);
}
});
wss.on('close', () => {
wss.clients.forEach((client: WebSocket) => {
/* istanbul ignore else */
if (client.readyState === WebSocket.OPEN) {
client.send('Router no longer running');
}
});
});
};
const router = () => {
const routerPort = getRouterPort();
isPortTaken(routerPort, (error: PortError | undefined, inUse?: boolean) => {
if (error) {
logger.log(error.message);
} else if (inUse) {
logger.log(`Router port ${routerPort} is already in use\n`);
} else {
logger.log(`Router starting on port ${routerPort}...\n`);
app.listen(routerPort, () => {
logger.log(`Router running on port ${routerPort}\n`);
const wss = new WebSocket.Server({ port: SOCKET_PORT });
startSockets(routerPort, wss);
});
}
});
};
init();
export default router;
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