add: afterConnect hook

changelog.md

 # Future
 - [FIXED] Soft-delete not returning number of affected rows on mssql [#6916](https://github.com/sequelize/sequelize/pull/6916)
+- [ADDED] `afterConnect` hook
 
 # 3.27.0
 - [FIXED] Incorrect column name for generateThroughJoin [#6878](https://github.com/sequelize/sequelize/pull/6878)

lib/dialects/abstract/connection-manager.js

@@ -244,9 +244,9 @@ ConnectionManager.prototype.releaseConnection = function(connection) {
 
 ConnectionManager.prototype.$connect = function(config) {
   return this.sequelize.runHooks('beforeConnect', config).bind(this).then(function () {
-    return this.dialect.connectionManager.connect(config).then(function (connection) {
-      return connection;
-    });
+    return this.dialect.connectionManager.connect(config);
+  }).then(function(connection) {
+    return this.sequelize.runHooks('afterConnect', connection, config).return(connection)
   });
 };
 ConnectionManager.prototype.$disconnect = function(connection) {
@@ -254,7 +254,7 @@ ConnectionManager.prototype.$disconnect = function(connection) {
 };
 
 ConnectionManager.prototype.$validate = function(connection) {
-  if (!this.dialect.connectionManager.validate) return Promise.resolve();
+  if (!this.dialect.connectionManager.validate) return true
   return this.dialect.connectionManager.validate(connection);
 };
 

lib/hooks.js

@@ -66,6 +66,7 @@ var hookTypes = {
   beforeInit: {params: 2, sync: true},
   afterInit: {params: 1, sync: true},
   beforeConnect: {params: 1},
+  afterConnect: {params: 2},
   beforeSync: {params: 1},
   afterSync: {params: 1},
   beforeBulkSync: {params: 1},
@@ -420,6 +421,31 @@ Hooks.hasHooks = Hooks.hasHook;
  * @param {String}   name
  * @param {Function} fn   A callback function that is called with sequelize
  * @name afterInit
+ * @memberOf Sequelize
+ */
+
+/**
+ * A hook that is run before a connection is created
+ * @param {String}   name
+ * @param {Function} fn   A callback function that is called with config passed to connection
+ * @name beforeConnect
+ * @memberOf Sequelize
+ */
+
+/**
+ * A hook that is run after a connection is created
+ * @param {String}   name
+ * @param {Function} fn   A callback function that is called with the connection object and thye config passed to connection
+ * @name afterConnect
+ * @memberOf Sequelize
+ */
+
+/**
+ * A hook that is run before Model.sync call
+ * @param {String}   name
+ * @param {Function} fn   A callback function that is called with options passed to Model.sync
+ * @name beforeSync
+ * @memberOf Sequelize
  */
 
  /**

test/unit/connection-manager.test.js

@@ -13,10 +13,11 @@ describe('connection manager', function () {
   describe('$connect', function () {
     beforeEach(function () {
       this.sinon = sinon.sandbox.create();
+      this.connection = {};
 
       this.dialect = {
         connectionManager: {
-          connect: this.sinon.stub().returns(Promise.resolve())
+          connect: this.sinon.stub().returns(Promise.resolve(this.connection))
         }
       };
 
@@ -59,5 +60,18 @@ describe('connection manager', function () {
         });
       }.bind(this));
     });
+
+    it('should call afterConnect', function() {
+      const spy = sinon.spy();
+      this.sequelize.afterConnect(spy);
+
+      var connectionManager = new ConnectionManager(this.dialect, this.sequelize);
+
+      return connectionManager.$connect({}).then(() => {
+        expect(spy.callCount).to.equal(1);
+        expect(spy.firstCall.args[0]).to.equal(this.connection);
+        expect(spy.firstCall.args[1]).to.eql({});
+      });
+    });
   });
 });