gRPC - v1.45.0

This is release 1.45.0 (gravity) of gRPC Core.

For gRPC documentation, see grpc.io. For previous releases, see Releases.

This release contains refinements, improvements, and bug fixes, with highlights listed below.

Core

• Backport "Include ADS stream error in XDS error updates (#29014)" to 1.45.x. (#29121)
• Bump core version to 23.0.0 for upcoming release. (#29026)
• Fix memory leak in HTTP request security handshake cancellation. (#28971)
• CompositeChannelCredentials: Comparator implementation. (#28902)
• Delete custom iomgr. (#28816)
• Implement transparent retries. (#28548)
• Uniquify channel args keys. (#28799)
• Set trailing_metadata_available for recv_initial_metadata ops when generating a fake status. (#28827)
• Eliminate gRPC insecure build. (#25586)
• Fix for a racy WorkSerializer shutdown. (#28769)
• InsecureCredentials: singleton object. (#28777)
• Add http cancel api. (#28354)
• Memory leak fix on windows in grpc_tcp_create(). (#27457)
• xDS: Rbac filter updates. (#28568)

C++

• Bump the minimum gcc to 5. (#28786)
• Add experimental API for CRL checking support to gRPC C++ TlsCredentials. (#28407)

C#

• [C#] Add cancellation token overloads to streaming interfaces. (#27886)
• [C#] Grpc.Core.Api nullable fixes. (#28616)

Objective-C

• Patch GRPCCallOptions to use nonatomic properties. (#28972)

Python

• Reimplement Gevent Integration. (#28276)
• Support musllinux binary wheels on x64 and x86. (#28092)
• Increase the Python protobuf requirement to >=3.12.0. (#28604)

Other

• Upgrade googletest. (#27287)