add /api/tunnels/:id/status endpoint

Provides connected_sockets information for a tunnel.

server.js

@@ -4,6 +4,7 @@ import tldjs from 'tldjs';
 import Debug from 'debug';
 import http from 'http';
 import { hri } from 'human-readable-ids';
+import Router from 'koa-router';
 
 import ClientManager from './lib/ClientManager';
 
@@ -25,23 +26,33 @@ export default function(opt) {
     const schema = opt.secure ? 'https' : 'http';
 
     const app = new Koa();
+    const router = new Router();
 
-    // api status endpoint
-    app.use(async (ctx, next) => {
-        const path = ctx.request.path;
-        if (path !== '/api/status') {
-            await next();
-            return;
-        }
-
+    router.get('/api/status', async (ctx, next) => {
         const stats = manager.stats;
-
         ctx.body = {
             tunnels: stats.tunnels,
             mem: process.memoryUsage(),
         };
     });
 
+    router.get('/api/tunnels/:id/status', async (ctx, next) => {
+        const clientId = ctx.params.id;
+        const client = manager.getClient(clientId);
+        if (!client) {
+            ctx.throw(404);
+            return;
+        }
+
+        const stats = client.stats();
+        ctx.body = {
+            connected_sockets: stats.connectedSockets,
+        };
+    });
+
+    app.use(router.routes());
+    app.use(router.allowedMethods());
+
     // root endpoint
     app.use(async (ctx, next) => {
         const path = ctx.request.path;