gRPC-Core Release 1.26.0

[Richard Belleville]

This is 1.26.0(gon) release announcement for gRPC-Core and the wrapped languages C++, C#, Objective-C, Python, PHP and Ruby. Latest release notes are here.

Core

• Fix compression filter crash on empty payload. (#21315)
• Ensure awake pollset_work threads exist on Windows. (#19311)
• Disable client_idle_filter. (#20910)
• Remove gpr_get/set_allocation_functions. (#20462)
• Security audit response. (#20839)

C++

• Automatically disable testing frameworks if gRPC_BUILD_TESTS=OFF. (#20976)
• Do not build channelz when gRPC_USE_PROTO_LITE. (#21011)
• Add options for all codegen plugins. (#20629)
• gRPC-C++ podspec follows gRPC versioning. (#20977)
• Issue 19208: Fix pollset_set_del_fd to cleanup all fd references. (#20452)
• De-duplicate .proto file processing. (#20537)
• cmake: Add VERSION and SOVERSION properties to libraries. (#20770)

C#

• C# Fix Unobserved Task Exception problem for cancelled calls with unexhausted response stream. (#21202)
• Fix C# sending empty payloads with gzip compression. (#21266)
• C#: fix #20782. (#20859)

Objective-C

• Update GRPCUnaryResponseHandler with generics. (#21316)

Python

• Release Python3.8 wheels for Windows. (#21271)
• Release Python3.8 wheel on macOS. (#21270)
• Fix issue with exception being out of scope in Python 3. (#20314)
• [AIO] Implement the shutdown process for AIO server and completion queue. (#20805)
• Attempt to drop support for Python 3.4. (#20789)
• AIO Unified call interface. (#20824)
• Make sure Core aware of gevent Cython objects. (#20891)
• [bazel] Add an ability to call an optional custom plugin for py_proto_library and py_grpc_library. (#20846)