gRPC Objective-C with CFStream

gRPC Objective-C library now provides the option to use Apple's CFStream API (rather than TCP sockets) for networking. Using CFStream resolves a bunch of network connectivity transition issues (see the doc for more information).

CFStream integration is now in experimental state. You will need explicit opt-in to use it to get the benefits of resolving the issues above. We expect to make CFStream the default networking interface that gRPC uses when it is ready for production.

Usage

If you use gRPC following the instructions in README.md:

• Replace the dependency on gRPC-ProtoRPC with gRPC-ProtoRPC/CFStream.
• Enable CFStream with environment variable grpc_cfstream=1. This can be done either in Xcode console or by your code with setenv() before gRPC is initialized.

If your project directly depends on podspecs other than gRPC-ProtoRPC (e.g. gRPC or gRPC-Core):

• Make your projects depend on subspecs corresponding to CFStream in each gRPC podspec.
• Enable CFStream with environment variable grpc_cfstream=1. This can be done either in Xcode console or by your code with setenv() before gRPC is initialized.

Notes

• Currently we do not support platforms other than iOS, although it is likely that this integration can run on MacOS targets with Apple's compiler.
• Let us know if you meet any issue by filing issue and ping @muxi.