putMessage blocks when sending lots of large messages #2167
Description
Context & versions
@jmagan found a bug that seems to show putMessage being blocked.
Signs point to it perhaps being a problem with the underlying "grapesy" library; as using etcdctl to send the messages (as the implementation for putMessage) works fine.
Steps to reproduce
See this test: https://github.com/cardano-scaling/hydra/pull/2166/files#diff-27aeed786584bbd0b1e142b5d933f35863f306563f0fadbdf789364d86a91f1cR76
This was noticed in real-usage with larger messages being sent frequently.
Actual behavior
After about 5k-10k messages, putMessage will block indefinitiely.
Expected behavior
It shouldn't block!