Add knownNodes (#91)

* Add knownNodes

* addNode reverse order

* Check for defined opts.nodes

* Improved test

Author: AndreiRegiani

index.js

@@ -77,7 +77,9 @@ class DHT extends EventEmitter {
     this.io.networkInterfaces.on('change', (interfaces) => this._onnetworkchange(interfaces))
 
     if (opts.nodes) {
-      for (const node of opts.nodes) this.addNode(node)
+      for (let i = opts.nodes.length - 1; i >= 0; i--) {
+        this.addNode(opts.nodes[i])
+      }
     }
   }
 

test.js

@@ -665,6 +665,22 @@ test('bootstrap with unreachable suggested-IP and fallback to DNS (reachable)',
   b.destroy()
 })
 
+test('Populate DHT with options.nodes', async function (t) {
+  const a = new DHT({ bootstrap: [] })
+  await a.ready()
+  const b = new DHT({ bootstrap: [] })
+  await b.ready()
+  const nodes = [{ host: '127.0.0.1', port: a.address().port }, { host: '127.0.0.1', port: b.address().port }]
+
+  const c = new DHT({ nodes, bootstrap: [] })
+  await c.ready()
+  t.alike(c.toArray(), nodes)
+
+  a.destroy()
+  b.destroy()
+  c.destroy()
+})
+
 test('peer ids do not retain a slab', async function (t) {
   const swarm = await makeSwarm(2, t)
   t.is(swarm[1].id.buffer.byteLength, 32)