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Changelog

2.0.0 (2021-06-27)

API Changes

  • Python 3.6 is the minimal support Python version.
  • Support for Python 3.7 has been added.
  • Support for Python 3.8 has been added.
  • Support for Python 3.9 has been added.
  • Support for Python 2.7 has been removed.
  • Support for Python 3.3 has been removed.
  • Support for Python 3.4 has been removed.
  • Support for Python 3.5 has been removed.
  • Support for PyPy (Python 2.7 compatible) has been removed.
  • Add type hints throughout and support PEP 561 via a py.typed file. This should allow projects to type check their usage of this dependency.
  • Throw TypeError when creating a priority tree with a maximum_streams value that is not an integer.
  • Throw ValueError when creating a priority tree with a maximum_streams value that is not a positive integer.

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.