Allow launching in blocking mode with enable_async=False flag

Author: bmwant

aiohttp_jinja2/__init__.py

@@ -60,7 +60,10 @@ def render_string(template_name, request, context, *, app_key=APP_KEY):
         raise web.HTTPInternalServerError(reason=text, text=text)
     if request.get(REQUEST_CONTEXT_KEY):
         context = dict(request[REQUEST_CONTEXT_KEY], **context)
-    text = yield from template.render_async(context)
+    if env.is_async:
+        text = yield from template.render_async(context)
+    else:
+        text = template.render(context)
     return text
 
 

tests/test_async_enabled.py

@@ -0,0 +1,35 @@
+import asyncio
+
+import jinja2
+import aiohttp_jinja2
+from aiohttp import web
+
+
+@asyncio.coroutine
+def test_async_mode_disabled(test_client, loop):
+    """
+    Test that running in blocking manner will also work.
+    """
+    @aiohttp_jinja2.template('tmpl.jinja2')
+    @asyncio.coroutine
+    def func(request):
+        return {'foo': 42}
+
+    app = web.Application(loop=loop)
+    template = "foo: {{foo}}"
+    aiohttp_jinja2.setup(
+        app,
+        loader=jinja2.DictLoader({
+            'tmpl.jinja2': template,
+        }),
+        enable_async=False,
+    )
+
+    app.router.add_get('/', func)
+
+    client = yield from test_client(app)
+
+    resp = yield from client.get('/')
+    assert 200 == resp.status
+    txt = yield from resp.text()
+    assert 'foo: 42' == txt