gRPC-Core Release 1.19.0

[Srini Polavarapu]

This is the 1.19.0 (gold) release announcement for gRPC-Core and the wrapped languages C++, C#, Objective-C, Python, PHP and Ruby. Latest release notes are here.

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

Core

• Fix c-ares on Windows "DNS resolution failure" triggered by logging. (#18092)
• Disable c-ares on Android (Backport #18046). (#18050)
• Ignore reserved bit in WINDOW_UPDATE frame. (#17950)
• Set c-ares as the default resolver. (#17897)
• Add period at end of metadata.google.internal to prevent unnecessary DNS lookups. (#17598)
• Decrease verbosity of ALTS platform check to avoid a spam log message. (#17874)
• Fix windows localhost address sorting bug. (#17790)
• Re-enable c-ares as the default resolver; but don't turn on SRV queries. (#17723)
• Remove filters from subchannel args. (#17629)

C++

• Register for cq avalanching when interceptors are going to be run. (#17806)
• Add a caching interceptor to the keyvaluestore example. (#17689)
• Enable per-channel subchannel pool. (#17513)
• Fix build with bazel 0.21. (#17684)
• Switch the default DNS resolver from native to c-ares. (#16862)
• Modifying semantics for GetSendMessage and GetSerializedSendMessage. Also adding ModifySendMessage. (#17630)
• Add interceptor methods to fail recv msg for hijacked rpcs and set recv message to nullptr on failure. (#17179)
• Add interceptor method to fail hijacked send messages and get status on POST_SEND_MESSAGE. (#17220)
• New Experimental Interception API - GetSendMessage and GetSerializedSendMessage. (#17609)

C#

• Upgrade System.Interactive.Async to 3.2.0. (#16745)
• Refactor ServerServiceDefinition and move it to Grpc.Core.Api nuget. (#17889)
• Allow passing null implementation to generated BindService overload using ServiceBinderBase. (#17837)
• Move public types needed for server implementation to Grpc.Core.Api. (#17778)

Objective-C

• Disable c-ares on iOS. (#17894)
• Added support for tvOS. (#17731)
• Fixing a few thread safety issues in gRPC Objective-C library. (#17578)
• Rolling out new API for gRPC Objective-C library. (#16190)

Python

• grpc_prefork(): check grpc_is_initialized before creating execctx. (#17996)
• [gRPC] Enable Python 3 for Bazel to Run Tests. (#17644)
• Escalate the failure of protoc execution. (#17734)
• Remove dependency of grpc.framework.foundation.callable_util. (#17543)

Ruby

• Disable service config resolution with c-ares by default, for now. (#17998)
• Ruby: refactor init/shutdown logic to avoid using atexit; fix windows. (#17997)
• Ruby tooling: respect user toolchain overrides. (#17606)