Authentication example is doesn't work

[Dentosal]

Bug Report

Version

Clean Tonic pulled from github master branch, at commit 4e0d2fc.

Platform

WSL 1 on WIndows 10. (4.4.0-19041-Microsoft #488-Microsoft x86_64 GNU/Linux)

Crates

Tonic itself, although I think it might be because Tower has changed.

Description

I tried

cd examples
 cargo run --bin authentication-client

And it crashes:

thread 'main' panicked at 'buffer full; poll_ready must be called first', /home/user/.cargo/registry/src/github.com-1ecc6299db9ec823/tower-0.4.8/src/buffer/service.rs:146:14
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

[davidpdrsn]

Thanks for noticing!

I did some digging and this is most likely because we don't propagate backpressure here, which leads to the client pancking since it contains a tower::buffer::Buffer. The fix is the replace that line with self.inner.poll_ready(cx). I'll do that this week unless someone snatches it.