WIP: rename Fig to Compose

Signed-off-by: Aanand Prasad <aanand.prasad@gmail.com>

compose/cli/verbose_proxy.py

@@ -0,0 +1,58 @@
+
+import functools
+from itertools import chain
+import logging
+import pprint
+
+import six
+
+
+def format_call(args, kwargs):
+    args = (repr(a) for a in args)
+    kwargs = ("{0!s}={1!r}".format(*item) for item in six.iteritems(kwargs))
+    return "({0})".format(", ".join(chain(args, kwargs)))
+
+
+def format_return(result, max_lines):
+    if isinstance(result, (list, tuple, set)):
+        return "({0} with {1} items)".format(type(result).__name__, len(result))
+
+    if result:
+        lines = pprint.pformat(result).split('\n')
+        extra = '\n...' if len(lines) > max_lines else ''
+        return '\n'.join(lines[:max_lines]) + extra
+
+    return result
+
+
+class VerboseProxy(object):
+    """Proxy all function calls to another class and log method name, arguments
+    and return values for each call.
+    """
+
+    def __init__(self, obj_name, obj, log_name=None, max_lines=10):
+        self.obj_name = obj_name
+        self.obj = obj
+        self.max_lines = max_lines
+        self.log = logging.getLogger(log_name or __name__)
+
+    def __getattr__(self, name):
+        attr = getattr(self.obj, name)
+
+        if not six.callable(attr):
+            return attr
+
+        return functools.partial(self.proxy_callable, name)
+
+    def proxy_callable(self, call_name, *args, **kwargs):
+        self.log.info("%s %s <- %s",
+                      self.obj_name,
+                      call_name,
+                      format_call(args, kwargs))
+
+        result = getattr(self.obj, call_name)(*args, **kwargs)
+        self.log.info("%s %s -> %s",
+                      self.obj_name,
+                      call_name,
+                      format_return(result, self.max_lines))
+        return result