Github user tliron commented on a diff in the pull request:
https://github.com/apache/incubator-ariatosca/pull/188#discussion_r130247609
--- 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):
+ current[arg] = {}
+ current = current[arg]
+
+ # Call
elif callable(current):
- kwargs = {}
- remaining_args = args[index:]
- if isinstance(remaining_args[-1], collections.MutableMapping):
- kwargs = remaining_args[-1]
- remaining_args = remaining_args[:-1]
- current = current(*remaining_args, **kwargs)
- break
+ if isinstance(current, functools.partial):
+ argspec = inspect.getargspec(current.func)
+ # Don't count initial args fulfilled by the partial
+ spec_args = argspec.args[len(current.args):]
+ # Don't count keyword args fulfilled by the partial
+ spec_args = tuple(a for a in spec_args if a not in
current.keywords)
+ else:
+ argspec = inspect.getargspec(current)
+ spec_args = argspec.args
+
+ callable_kwargs = {}
+ if isinstance(arg, dict):
+ # If the first arg is a dict, treat it as our kwargs
+ # TODO: what if the first argument really needs to be a
dict?
+ callable_kwargs = arg
+ index += 1
+
+ if argspec.varargs is not None:
+ # Gobble the rest of the args
+ callable_args = args[index:]
+ else:
+ # Take only what we need
+ spec_args = tuple(a for a in spec_args if a not in
callable_kwargs)
+ spec_args_count = len(spec_args)
+ if inspect.ismethod(current):
+ # Don't count "self" argument
+ spec_args_count -= 1
+ callable_args = args[index:index + spec_args_count]
--- End diff --
See comment above: we can't just grab all remaining args, because we might
need these args for further delving into the returned value of the callable.
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