fix(client): Fix a bug where it causes Node process to crash when calling emit(), disconnect() and connect() in quick succession (#34)

Signed-off-by: Ray Tung <ray@kasada.io>

Author: raytung

src/socket.ts

@@ -10,7 +10,6 @@ import {
 } from "./error";
 import * as protocol from "./protocol";
 import {PassThrough, Duplex} from "stream";
-import {awaitNextTick} from "./util";
 
 /**
  * Reconnection settings for the socket
@@ -345,7 +344,9 @@ export class FluentSocket extends EventEmitter {
     ) {
       if (this.state === SocketState.DISCONNECTING) {
         // Try again once the socket has fully closed
-        await awaitNextTick();
+        await new Promise(resolve =>
+          this.once(FluentSocketEvent.CLOSE, resolve)
+        );
         return await this.connect();
       } else {
         // noop, we're connected

test/test.client.ts

@@ -16,6 +16,7 @@ import {
 } from "../src/error";
 import {awaitNextTick, awaitTimeout} from "../src/util";
 import {FluentSocketEvent} from "../src/socket";
+import {FluentServer} from "../src";
 
 chai.use(chaiAsPromised);
 const expect = chai.expect;
@@ -518,6 +519,33 @@ describe("FluentClient", () => {
     sinon.assert.calledTwice(spy);
   });
 
+  it("should allow multiple connects and disconnects in succession", async () => {
+    const server = new FluentServer();
+    await server.listen();
+
+    try {
+      const client = new FluentClient("abc", {
+        socket: {
+          port: server.port,
+        },
+        disableAutoconnect: true,
+      });
+
+      await client.connect();
+      try {
+        const firstEvent = client.emit("a", {event: "foo bar"});
+
+        await client.disconnect();
+        await client.connect();
+        await expect(firstEvent).to.eventually.be.fulfilled;
+      } finally {
+        await client.shutdown();
+      }
+    } finally {
+      await server.close();
+    }
+  });
+
   it("should reject pending events after shutdown", async () => {
     const {client, socket} = createFluentClient("test");
     socket.isWritable = false;