Don't (mistakenly) set HTTP 204 on controllers which set response.body_file.

Fixes bug 1339121

Change-Id: I70785315837b3907b63bb10565f3ccdf07559e8d

pecan/core.py

@@ -2,11 +2,12 @@ try:
     from simplejson import dumps, loads
 except ImportError:  # pragma: no cover
     from json import dumps, loads  # noqa
-from itertools import chain
+from itertools import chain, tee
 from mimetypes import guess_type, add_type
 from os.path import splitext
 import logging
 import operator
+import types
 
 import six
 
@@ -566,7 +567,26 @@ class PecanBase(object):
         elif result:
             resp.body = result
         elif response.status_int == 200:
-            resp.status = 204
+            # If the response is a generator...
+            if isinstance(response.app_iter, types.GeneratorType):
+                # Split the generator into two so we can peek at one of them
+                # and determine if there is any response body content
+                a, b = tee(response.app_iter)
+                try:
+                    next(a)
+                except StopIteration:
+                    # If we hit StopIteration, the body is empty
+                    resp.status = 204
+                finally:
+                    resp.app_iter = b
+            else:
+                text = None
+                if response.charset:
+                    # `response.text` cannot be accessed without a charset
+                    # (because we don't know which encoding to use)
+                    text = response.text
+                if not any((response.body, text)):
+                    resp.status = 204
 
         if resp.status_int in (204, 304):
             resp.content_type = None

pecan/tests/test_base.py

@@ -44,6 +44,30 @@ class TestEmptyContent(PecanTestCase):
             def index(self):
                 pass
 
+            @expose()
+            def explicit_body(self):
+                response.body = b_('Hello, World!')
+
+            @expose()
+            def empty_body(self):
+                response.body = b_('')
+
+            @expose()
+            def explicit_text(self):
+                response.text = six.text_type('Hello, World!')
+
+            @expose()
+            def empty_text(self):
+                response.text = six.text_type('')
+
+            @expose()
+            def explicit_json(self):
+                response.json = {'foo': 'bar'}
+
+            @expose()
+            def explicit_json_body(self):
+                response.json_body = {'foo': 'bar'}
+
         return TestApp(Pecan(RootController()))
 
     def test_empty_index(self):
@@ -53,6 +77,65 @@ class TestEmptyContent(PecanTestCase):
         self.assertEqual(r.headers['Content-Length'], '0')
         self.assertEqual(len(r.body), 0)
 
+    def test_explicit_body(self):
+        r = self.app_.get('/explicit_body/')
+        self.assertEqual(r.status_int, 200)
+        self.assertEqual(r.body, b_('Hello, World!'))
+
+    def test_empty_body(self):
+        r = self.app_.get('/empty_body/')
+        self.assertEqual(r.status_int, 204)
+        self.assertEqual(r.body, b_(''))
+
+    def test_explicit_text(self):
+        r = self.app_.get('/explicit_text/')
+        self.assertEqual(r.status_int, 200)
+        self.assertEqual(r.body, b_('Hello, World!'))
+
+    def test_empty_text(self):
+        r = self.app_.get('/empty_text/')
+        self.assertEqual(r.status_int, 204)
+        self.assertEqual(r.body, b_(''))
+
+    def test_explicit_json(self):
+        r = self.app_.get('/explicit_json/')
+        self.assertEqual(r.status_int, 200)
+        json_resp = json.loads(r.body.decode())
+        assert json_resp == {'foo': 'bar'}
+
+    def test_explicit_json_body(self):
+        r = self.app_.get('/explicit_json_body/')
+        self.assertEqual(r.status_int, 200)
+        json_resp = json.loads(r.body.decode())
+        assert json_resp == {'foo': 'bar'}
+
+
+class TestAppIterFile(PecanTestCase):
+    @property
+    def app_(self):
+        class RootController(object):
+            @expose()
+            def index(self):
+                body = six.BytesIO(b_('Hello, World!'))
+                response.body_file = body
+
+            @expose()
+            def empty(self):
+                body = six.BytesIO(b_(''))
+                response.body_file = body
+
+        return TestApp(Pecan(RootController()))
+
+    def test_body_generator(self):
+        r = self.app_.get('/')
+        self.assertEqual(r.status_int, 200)
+        assert r.body == b_('Hello, World!')
+
+    def test_empty_body_generator(self):
+        r = self.app_.get('/empty')
+        self.assertEqual(r.status_int, 204)
+        assert len(r.body) == 0
+
 
 class TestIndexRouting(PecanTestCase):