Github user mxmrlv commented on a diff in the pull request:
https://github.com/apache/incubator-ariatosca/pull/188#discussion_r130241087
--- Diff: aria/orchestrator/execution_plugin/ctx_proxy/server.py ---
@@ -150,43 +150,101 @@ def __exit__(self, *args, **kwargs):
self.close()
-def _process_ctx_request(ctx, args):
+def _process_ctx_request(ctx, args): # pylint:
disable=too-many-branches,too-many-statements
current = ctx
- num_args = len(args)
index = 0
+
+ try:
+ # TODO: should there be a way to escape "=" in case it is needed
as real argument?
+ equals_index = args.index('=')
+ if equals_index == 0:
+ raise RuntimeError('The "=" argument cannot be first')
+ if equals_index != len(args) - 2:
+ raise RuntimeError('The "=" argument must be penultimate')
+ modifying = True
+ modifying_key = args[-3]
+ modifying_value = args[-1]
+ args = args[:-3]
+ except ValueError:
+ modifying = False
+ modifying_key = None
+ modifying_value = None
+
+ num_args = len(args)
+
while index < num_args:
arg = args[index]
+
+ # Object attribute
attr = _desugar_attr(current, arg)
- if attr:
+ if attr is not None:
current = getattr(current, attr)
- elif isinstance(current, collections.MutableMapping):
- key = arg
- path_dict = _PathDictAccess(current)
- if index + 1 == num_args:
- # read dict prop by path
- value = path_dict.get(key)
- current = value
- elif index + 2 == num_args:
- # set dict prop by path
- value = args[index + 1]
- path_dict.set(key, value)
- current = None
- else:
- raise RuntimeError('Illegal argument while accessing dict')
- break
+
+ # List entry
+ elif isinstance(current, list) and _is_int(arg):
+ current = current[int(arg)]
+
+ # Dict (or dict-like object) value
+ elif hasattr(current, '__getitem__'):
+ if modifying and (not arg in current):
--- End diff --
According to these semantics we lose any knowledge of whether we are
accessing a list or a dict
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