Add handle runner

lantern/handle.py

@@ -0,0 +1,20 @@
+import subprocess
+import json
+from collections import namedtuple
+
+
+Result = namedtuple('Result', ['exit_code', 'html', 'error'])
+
+
+def execute_handle(executable, request_data):
+    input_data = json.dumps(request_data).encode('utf-8')
+    cmd = subprocess.run(executable, input=input_data, stdout=subprocess.PIPE)
+    return Result(
+        cmd.returncode,
+        cmd.stdout.decode('utf-8'),
+        cmd.stderr.decode('utf-8')
+    )
+
+
+def get_http_status_code(exit_code):
+    return 200 if exit_code == 0 else 500