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Changelog
=========
1.3.0 (2017-01-27)
------------------
**API Changes**
- Throw ``PriorityLoop`` when inserting or reprioritising a stream that
depends on itself.
- Throw ``BadWeightError`` when creating or reprioritising a stream with a
weight that is not an integer between 1 and 256, inclusive.
- Throw ``PseudoStreamError`` when trying to reprioritise, remove, block or
unblock stream 0.
- Add a new ``PriorityError`` parent class for the exceptions that can be
thrown by priority.
1.2.2 (2016-11-11)
------------------
**Bugfixes**
- Allow ``insert_stream`` to be called with ``exclusive=True`` but no explicit
``depends_on`` value.
1.2.1 (2016-10-26)
------------------
**Bugfixes**
- Allow insertion of streams that have parents in the idle or closed states.
This would previously raise a KeyError.
1.2.0 (2016-08-04)
------------------
**Security Fixes**
- CVE-2016-6580: All versions of this library prior to 1.2.0 are vulnerable to
a denial of service attack whereby a remote peer can cause a user to insert
an unbounded number of streams into the priority tree, eventually consuming
all available memory.
This version adds a ``TooManyStreamsError`` exception that is raised when
too many streams are inserted into the priority tree. It also adds a keyword
argument to the priority tree, ``maximum_streams``, which limits how many
streams may be inserted. By default, this number is set to 1000.
Implementations should strongly consider whether they can set this value
lower.
1.1.1 (2016-05-28)
------------------
**Bugfixes**
- 2.5x performance improvement by swapping from ``queue.PriorityQueue`` to
``heapq``.
1.1.0 (2016-01-08)
------------------
**API Changes**
- Throw ``DuplicateStreamError`` when inserting a stream that is already in the
tree.
- Throw ``MissingStreamError`` when reprioritising a stream that is not in the
tree.
1.0.0 (2015-12-07)
------------------
- Initial release.
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