Fix middleware backwards compatibility (#246)

* Fix middleware `client instanceof Raven.Client` check to use `Raven.constructor` (thanks @dhritzkiv)

* Add deprecation warning to top-level middleware

* Add tests for top-level Raven.middleware backwards compat

lib/middleware/connect.js

@@ -1,24 +1,33 @@
 'use strict';
 
 var Raven = require('../client');
+var utils = require('../utils');
 
 // Legacy support
 var connectMiddleware = function (client) {
   return connectMiddleware.errorHandler(client);
 };
 
+var getClient = function (clientOrDSN) {
+  // Raven is an instance, so use Raven.constructor for instanceof check
+  return clientOrDSN instanceof Raven.constructor ? clientOrDSN : new Raven.Client(clientOrDSN);
+};
+
 // Error handler. This should be the last item listed in middleware, but
 // before any other error handlers.
-connectMiddleware.errorHandler = function (client) {
-  client = client instanceof Raven.Client ? client : new Raven.Client(client);
-  return client.errorHandler();
+connectMiddleware.errorHandler = function (clientOrDSN) {
+  utils.consoleAlert('top-level Raven.middleware.*.errorHandler has been deprecated and will be removed in v2.0; use Raven.errorHandler() instance method instead');
+  return getClient(clientOrDSN).errorHandler();
 };
 
 // Ensures asynchronous exceptions are routed to the errorHandler. This
 // should be the **first** item listed in middleware.
-connectMiddleware.requestHandler = function (client) {
-  client = client instanceof Raven.Client ? client : new Raven.Client(client);
-  return client.requestHandler();
+connectMiddleware.requestHandler = function (clientOrDSN) {
+  utils.consoleAlert('top-level Raven.middleware.*.requestHandler has been deprecated and will be removed in v2.0; use Raven.requestHandler() instance method instead');
+  return getClient(clientOrDSN).requestHandler();
 };
 
+// for testing purposes only; not gonna worry about a nicer test exposure scheme since this code is going away soon
+connectMiddleware.getClient = getClient;
+
 module.exports = connectMiddleware;

test/raven.client.js

@@ -899,3 +899,18 @@ describe('raven.Client', function () {
     });
   });
 });
+
+describe('raven.middleware', function () {
+  it('should use an instance passed to it instead of making a new one', function () {
+    var client = new raven.Client(dsn);
+    raven.middleware.express.getClient(client).should.equal(client);
+  });
+
+  it('should make a new instance when passed a DSN string', function () {
+    var client1 = new raven.Client(dsn);
+    var client2 = raven.middleware.express.getClient(dsn);
+    client2.should.not.equal(raven);
+    client2.should.not.equal(client1);
+    client2.should.be.an.instanceof(raven.constructor);
+  });
+});