Implements TCP Tx-side zerocopy. Must be explicitly enabled to use.
For large RPCs (>= 16KiB) it reduces the amount of CPU time spent
since it avoids a userspace to kernel data buffer copy. However, there
is a tradeoff - the application must process a callback on the socket
error queue placed by the kernel, informing the application that the
data buffer can be freed since the kernel is done. The cost of
processing the error queue means that we do not have an advantage for
small RPCs.
* Remove the weird cancellation_future;
* Convert all CancelledError into RpcError with CANCELLED;
* Move part of call logic from Cython to Python layer;
* Make unary-stream call based on reader API instead of async generator.
This PR contains:
1. An ALTS context exposed for users to use, and a GetAltsContextFromAuthContext() function to get ALTS context from an AuthContext. Functionality-wise this part is similar with a previous PR https://github.com/grpc/grpc/pull/21536, but in this PR, we adjusted the code structure and made some minor changes to better suit function clientAuthzCheck()
2. A clientAuthzCheck() function for users to check if the server is authorized
In the interest of not providing too many different ways to build
gRPC in our official instructions, we are dropping the section describing
how to do a "superbuild" (ExternalProject_Add). We can still point to the
example and distribtest if someone is curious how to do this.
Yihua Zhang
Stanley Cheung
Akshay Kumar
Arjun Roy
yang-g
Richard Belleville
Lidi Zheng
Esun Kim
Esun Kim
Yash Tibrewal
Zhen Lian
Vijay Pai
Pau Freixes
Zack Galbreath
Ashitha Santhosh
Guantao Liu
Mark D. Roth