Show git head in health infos

app.py

@@ -20,8 +20,9 @@ startup_timestamp = datetime.now()
 
 class HealthHandler(tornado.web.RequestHandler, metaclass=ABCMeta):
     # noinspection PyAttributeOutsideInit
-    def initialize(self):
+    def initialize(self, sources=None):
         self.git_version = self._load_git_version()
+        self.sources = sources
 
     @staticmethod
     def _load_git_version():
@@ -53,6 +54,12 @@ class HealthHandler(tornado.web.RequestHandler, metaclass=ABCMeta):
         health['timestamp'] = isodate.datetime_isoformat(datetime.now())
         health['uptime'] = isodate.duration_isoformat(datetime.now() - startup_timestamp)
 
+        if self.sources:
+            for s in self.sources:
+                h = s()
+                if h is not None:
+                    health = {**health, **h}
+
         self.set_header("Content-Type", "application/json")
         self.write(json.dumps(health, indent=4))
         self.set_status(200)
@@ -70,10 +77,11 @@ class Oas3Handler(tornado.web.RequestHandler, metaclass=ABCMeta):
         self.finish()
 
 
-def make_app(_auth_provider=None):
+def make_app(_auth_provider=None, gitmgr=None):
     version_path = r"/v[0-9]"
     return tornado.web.Application([
-        (version_path + r"/health", HealthHandler),
+        (version_path + r"/health", HealthHandler,
+         {"sources": [lambda: {"git-head":  gitmgr.head_sha}] if gitmgr else None}),
         (version_path + r"/oas3", Oas3Handler),
     ])
 
@@ -89,7 +97,7 @@ def main():
     gitmgr.setup()
     gitmgr.printout()
 
-    util.run_tornado_server(make_app(auth_provider),
+    util.run_tornado_server(make_app(auth_provider, gitmgr),
                             server_port=port)
 
     # Teardown