tcp_stream: implement keepalive/set_keepalive #3274
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In order to restore the ability to set keepalive duration for a TCP stream, a pair of keepalive()/set_keepalive() functions are implemented on top of mio's keepalive feature. Refs tokio-rs#3082
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Thanks for taking the time to submit this, we decided to punt this for now: #3146. That PR did have some notes on next steps. I would recommend opening an issue w/ a proposed API, and details on portability across platforms. Additionally, it should be possible to set the keepalive from outside of Tokio, so you should not be blocked. |
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Motivation
Setting keepalive parameters used to be possible in previous releases, and it would be nice to restore this capability. Long-standing TCP connections could benefit from having keepalive probes enabled. Example use case: scylladb/scylla-rust-driver#132
Refs #3082
Solution
A pair of keepalive()/set_keepalive() functions are implemented on top of mio's keepalive feature (added in tokio-rs/mio#1385). The interface is consistent with the one from Tokio 0.2.9. This patch comes with a simple test which verifies that previously set values are indeed saved.