Cleaning up wrap, adding interceptErr (#225)

* Cleaning up wrap, adding intercept

* Make intercept preserve function details like wrap

* Add intercept tests

* Change intercept to interceptErr

lib/client.js

@@ -241,17 +241,39 @@ extend(Raven.prototype, {
       };
     }
 
-    wrapDomain.on('error', function (err) {
-      onErr(err, wrapDomain.sentryContext);
-    });
+    wrapDomain.on('error', onErr);
+    var wrapped = wrapDomain.bind(func);
+
+    for (var property in func) {
+      if ({}.hasOwnProperty.call(func, property)) {
+        wrapped[property] = func[property];
+      }
+    }
+    wrapped.prototype = func.prototype;
+    wrapped.__raven__ = true;
+    wrapped.__inner__ = func;
+    // note: domain.bind sets wrapped.domain, but it's not documented, unsure if we should rely on that
+    wrapped.__domain__ = wrapDomain;
 
-    var wrapped = function wrapped() {
-      // todo make sure this is the best/right way to do this
-      var args = Array.prototype.slice.call(arguments);
-      args.unshift(func);
-      wrapDomain.run.apply(wrapDomain, args);
+    return wrapped;
+  },
+
+  interceptErr: function (options, func) {
+    if (!func && typeof options === 'function') {
+      func = options;
+      options = {};
+    }
+    var self = this;
+    var wrapped = function () {
+      var err = arguments[0];
+      if (err instanceof Error) {
+        self.captureException(err, options);
+      } else {
+        func.apply(null, arguments);
+      }
     };
 
+    // repetitive with wrap
     for (var property in func) {
       if ({}.hasOwnProperty.call(func, property)) {
         wrapped[property] = func[property];
@@ -260,7 +282,6 @@ extend(Raven.prototype, {
     wrapped.prototype = func.prototype;
     wrapped.__raven__ = true;
     wrapped.__inner__ = func;
-    wrapped.__domain__ = wrapDomain;
 
     return wrapped;
   },
@@ -282,7 +303,7 @@ extend(Raven.prototype, {
     }
   },
 
-  getContext: function setContext(ctx) {
+  getContext: function getContext() {
     if (!domain.active) {
       utils.consoleAlert('attempt to getContext outside context scope');
       return null;

test/raven.client.js

@@ -836,4 +836,61 @@ describe('raven.Client', function () {
       client._globalContext.tags.should.have.property('platform', 'OS X');
     });
   });
+
+  describe('#intercept()', function () {
+    it('should catch an err param', function (done) {
+      var scope = nock('https://app.getsentry.com')
+        .filteringRequestBody(/.*/, '*')
+        .post('/api/269/store/', '*')
+        .reply(200, function (uri, body) {
+          zlib.inflate(new Buffer(body, 'base64'), function (err, dec) {
+            if (err) return done(err);
+            var msg = JSON.parse(dec.toString());
+            msg.message.indexOf('foo').should.not.equal(-1);
+            done();
+          });
+          return 'OK';
+        });
+
+      client.on('logged', function () {
+        scope.done();
+      });
+
+      client.interceptErr(function (err) {
+        done(new Error('called wrapped function'));
+      })(new Error('foo'));
+    });
+
+    it('should pass options to captureException', function (done) {
+      var scope = nock('https://app.getsentry.com')
+        .filteringRequestBody(/.*/, '*')
+        .post('/api/269/store/', '*')
+        .reply(200, function (uri, body) {
+          zlib.inflate(new Buffer(body, 'base64'), function (err, dec) {
+            if (err) return done(err);
+            var msg = JSON.parse(dec.toString());
+            msg.message.indexOf('foo').should.not.equal(-1);
+            msg.extra.foo.should.equal('bar');
+            done();
+          });
+          return 'OK';
+        });
+
+      client.on('logged', function () {
+        scope.done();
+      });
+
+      client.interceptErr({ extra: { foo: 'bar' } }, function (err) {
+        done(new Error('called wrapped function'));
+      })(new Error('foo'));
+    });
+
+    it('should call original when no err', function (done) {
+      client.interceptErr(function (err, result) {
+        if (err != null) return done(err);
+        result.should.equal('result');
+        done();
+      })(null, 'result');
+    });
+  });
 });