gRPC-Core Release 1.24.0 (ganges)

[Esun Kim]

This is 1.24.0 (ganges) release announcement for gRPC-Core and the wrapped languages C++, C#, Objective-C, Python, PHP and Ruby. Latest release notes are here.

Core

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- gRPC Core starts to have a dependency against the C++ standard library such as libstdc++.so depending on the platform. This applies to all wrapped libraries and they have this new dependency, too. (For more detail, see the [proposal](https://github.com/grpc/proposal/blob/master/L59-core-allow-cppstdlib.md))

-  Remove call from queued picks when failing it due to channel destruction. ([#20128](https://github.com/grpc/grpc/pull/20128))

-  Catch the error if socket initialization fails. ([#19766](https://github.com/grpc/grpc/pull/19766))

-  Do not create streams after a GOAWAY has been received. ([#19968](https://github.com/grpc/grpc/pull/19968))

-  Prevent HTTP2 parser from queueing a lot of induced frames. ([#19924](https://github.com/grpc/grpc/pull/19924))

-  Send RPC deadline to server in cronet header. ([#19820](https://github.com/grpc/grpc/pull/19820))

-  Mandate static string for host and method passed to grpc_channel_register. ([#19263](https://github.com/grpc/grpc/pull/19263))

-  Fail SEND_MESSAGE ops if stream is closed for writes. ([#19868](https://github.com/grpc/grpc/pull/19868))

-  Add Delegating Channel. ([#19316](https://github.com/grpc/grpc/pull/19316))

C++

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-  Allow call credentials interception at PRE_SEND_INITIAL_METADATA. ([#20188](https://github.com/grpc/grpc/pull/20188))

-  Upgrade to Bazel 0.29 (including Windows RBE). ([#20165](https://github.com/grpc/grpc/pull/20165))

-  Update Google Benchmark v1.5.0 to get CMake < 3.6 fix. ([#19535](https://github.com/grpc/grpc/pull/19535))

-  Fix a big source of races in CHTTP2 code. ([#20139](https://github.com/grpc/grpc/pull/20139))

-  Channel idleness atomic. ([#19727](https://github.com/grpc/grpc/pull/19727))

-  Update C++ code generation to work with Bazel 0.29 . ([#19860](https://github.com/grpc/grpc/pull/19860))

C#

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-  Revert "Enable bitcode for ios native libraries" in v1.24.x. ([#20233](https://github.com/grpc/grpc/pull/20233))

-  C#: support serialization to IBufferWriter. ([#19792](https://github.com/grpc/grpc/pull/19792))

-  Remove LiteClientBase. ([#20149](https://github.com/grpc/grpc/pull/20149))

-  Enable bitcode for ios native libraries. ([#20113](https://github.com/grpc/grpc/pull/20113))

Objective-C

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-  Added experimental tvOS and watchOS support. ([#19787](https://github.com/grpc/grpc/pull/19787))

Python

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-  Add strip_prefix to python protoc plugin and py_grpc_library. ([#20141](https://github.com/grpc/grpc/pull/20141))

-  Switch py_proto_library from using src to deps to conform with google3. ([#20027](https://github.com/grpc/grpc/pull/20027))

-   Expose local credentials on Python layer. ([#19971](https://github.com/grpc/grpc/pull/19971))

-   Make default vtable for pointer argument a constant. ([#20013](https://github.com/grpc/grpc/pull/20013))

-  Gracefully handle errors from Future object callbacks. ([#20015](https://github.com/grpc/grpc/pull/20015))

-  Gracefully handle exceptions raised by signal handlers on the main thread while unary RPCs are in flight. ([#19988](https://github.com/grpc/grpc/pull/19988))

-  Separate py_grpc_library and py_proto_library. ([#19822](https://github.com/grpc/grpc/pull/19822))

-  Add wait_for_termination method to grpc.Server. ([#19299](https://github.com/grpc/grpc/pull/19299))

-  Add Python Cancellation Example. ([#19465](https://github.com/grpc/grpc/pull/19465))

Ruby

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-  Define Struct::Status in Ruby. ([#19939](https://github.com/grpc/grpc/pull/19939))

-  Allow Ruby style (::) package names in Ruby codegen. ([#19940](https://github.com/grpc/grpc/pull/19940))

-  Allow loading grpc/errors.rb before grpc.rb. ([#19893](https://github.com/grpc/grpc/pull/19893))