Merge pull request #171 from Lukasa/update-hyperframe

Update hyperframe to v2.1.0

Author: Lukasa

Diff for: hyper/packages/hyperframe/__init__.py

@@ -5,4 +5,4 @@
 
 A module for providing a pure-Python HTTP/2 framing layer.
 """
-__version__ = '1.1.1'
+__version__ = '2.1.0'

Diff for: hyper/packages/hyperframe/flags.py

@@ -0,0 +1,40 @@
+# -*- coding: utf-8 -*-
+"""
+hyperframe/flags
+~~~~~~~~~~~~~~~~
+
+Defines basic Flag and Flags data structures.
+"""
+import collections
+
+
+Flag = collections.namedtuple("Flag", ["name", "bit"])
+
+
+class Flags(collections.MutableSet):
+    """
+    A simple MutableSet implementation that will only accept known flags as elements.
+
+    Will behave like a regular set(), except that a ValueError will be thrown when .add()ing
+    unexpected flags.
+    """
+    def __init__(self, defined_flags):
+        self._valid_flags = set(flag.name for flag in defined_flags)
+        self._flags = set()
+
+    def __contains__(self, x):
+        return self._flags.__contains__(x)
+
+    def __iter__(self):
+        return self._flags.__iter__()
+
+    def __len__(self):
+        return self._flags.__len__()
+
+    def discard(self, value):
+        return self._flags.discard(value)
+
+    def add(self, value):
+        if value not in self._valid_flags:
+            raise ValueError("Unexpected flag: {}".format(value))
+        return self._flags.add(value)