fix: shall re-throw errors on first connect

lib/mongoose.js

@@ -3,7 +3,7 @@
 const assert = require('assert');
 const path = require('path');
 const mongoose = require('mongoose');
-const awaitEvent = require('await-event');
+const awaitFirst = require('await-first');
 
 let count = 0;
 
@@ -76,7 +76,7 @@ function createOneClient(config, app) {
 
   app.beforeStart(function* () {
     app.coreLogger.info('[egg-mongoose] starting...');
-    yield awaitEvent(db, 'connected');
+    yield awaitFirst(db, [ 'connected', 'error' ]);
     const index = count++;
     /*
      *remove heartbeat to avoid no authentication

package.json

@@ -13,7 +13,7 @@
     "egg-plugin"
   ],
   "dependencies": {
-    "await-event": "^2.0.0",
+    "await-first": "^1.0.0",
     "mongoose": "^4.8.6"
   },
   "devDependencies": {

test/mongoose.test.js

@@ -3,6 +3,8 @@
 const assert = require('assert');
 const request = require('supertest');
 const mm = require('egg-mock');
+const mongoose = require('mongoose');
+const EventEmitter = require('events');
 
 describe('test/mongoose.test.js', () => {
   describe('base', () => {
@@ -201,4 +203,55 @@ describe('test/mongoose.test.js', () => {
       assert(app.model.Other === undefined);
     });
   });
+
+  describe('throws on first connection', () => {
+    let app;
+    const createConnection = mongoose.createConnection;
+    let connection;
+    let onCreateConnection;
+    beforeEach(function* () {
+      connection = new EventEmitter();
+      mongoose.createConnection = () => {
+        setTimeout(onCreateConnection, 10);
+        return connection;
+      };
+    });
+
+    afterEach(function* () {
+      yield app.close();
+    });
+    afterEach(mm.restore);
+    afterEach(() => {
+      connection = null;
+      onCreateConnection = null;
+      mongoose.createConnection = createConnection;
+    });
+
+    it('should establish first connection', function* () {
+      app = mm.app({
+        baseDir: 'apps/mongoose',
+      });
+      onCreateConnection = () => {
+        connection.emit('connected');
+      };
+      yield app.ready();
+    });
+
+    it('should rethrow on first connection', function* () {
+      app = mm.app({
+        baseDir: 'apps/mongoose',
+      });
+      onCreateConnection = () => {
+        connection.emit('error', new Error('foobar'));
+      };
+      try {
+        yield app.ready();
+      } catch (err) {
+        assert(err != null);
+        assert(err.message === '[egg-mongoose]foobar');
+        return;
+      }
+      assert.fail('shall not succeeded');
+    });
+  });
 });