Fill in build_info.

am_i_up/am_i_up.py

@@ -10,6 +10,8 @@
 #
 from aiohttp import web
 import time
+from ament_index_python import get_package_share_directory
+import yaml
 
 def main():
     facts = Facts()
@@ -32,7 +34,24 @@ class Facts:
         return time.monotonic() - self._start_time
 
     def get_buildinfo(self):
+        # Find the share directory for 'build_info_getter'.
+        build_info_getter_directory = None
+        try:
+            build_info_getter_directory = get_package_share_directory('build_info_getter')
+        except:
+            return None
+        # Find and read the project_state.repos file in it.
+        project_state_file = build_info_getter_directory + "/project_state.repos"
+        project_state_content = None
+        try:
+            with open(project_state_file, 'r') as file_obj:
+                project_state_content = yaml.safe_load(file_obj)
+        except:
+            # We either didn't load the file or couldn't read it
+            # as json.
+            # If we ignore the error, we'll respond with a None which is the right thing.
             pass
+        return project_state_content
 
 class Routes:
     def __init__(self, facts):
@@ -51,8 +70,12 @@ class Routes:
         return web.json_response(resp)
 
     async def build_info(self, request):
-        resp = self.get_buildinfo()
-        return web.Response(text=text)
+        project_state = self._facts.get_buildinfo()
+        if not project_state:
+            resp = {"status": False, "message": "project_state not found."}
+            return web.json_response(resp)
+        project_state["status"] = True
+        return web.json_response(project_state)