From: "ioquatix (Samuel Williams)" Date: 2022-03-31T22:52:07+00:00 Subject: [ruby-core:108149] [Ruby master Feature#18630] Introduce general `IO#timeout` and `IO#timeout=`for all (non-)blocking operations. Issue #18630 has been updated by ioquatix (Samuel Williams). > many of functions involved above don't ever return ETIMEDOUT, so it would be incorrect/surprising to reuse it for that. The reality is, some functions **do** return this and so we should consider how it impacts users who want to handle **all** IO timeouts. Having two distinct exceptions seems a little messy to me. I'm happy to accept these are different, but I'm also suggesting we should consider carefully the implications of this choice. Basically, do we want users to write: ``` rescue IO::TimeoutError, Errno::ETIMEDOUT ``` ??? ---------------------------------------- Feature #18630: Introduce general `IO#timeout` and `IO#timeout=`for all (non-)blocking operations. https://bugs.ruby-lang.org/issues/18630#change-97123 * Author: ioquatix (Samuel Williams) * Status: Open * Priority: Normal ---------------------------------------- I would like us to consider introducing a general IO timeout for all (non-)blocking operations, specified per-IO instance. It's useful for ensuring programs don't stop responding or spend an unreasonable amount of time waiting for IO operations. There are effectively two kinds of interfaces that we need to address: - Those that already have a timeout argument (e.g. `wait_readable`) and we follow the existing semantics. - Those that don't have a timeout argument or timeout semantics (e.g. `puts`, `gets`), and thus probably need to raise an exception on timeout. We have three possible kinds of exceptions we could raise: - `Errno::ETIMEDOUT` - `Timeout::Error` (from `timeout.rb`) - Introduce `IO::Timeout` or something similar. Timeout isn't necessarily an error condition. There are different arguments for whether we should define: ```ruby class IO::Timeout < Exception end # or class IO::Timeout < StandardError end ``` I believe the latter (`StandardError`) is more practical but I'm open to either option. I might have more specific arguments later why one is better than the other after testing in a practical system. There is already a PR to try it out: https://github.com/ruby/ruby/pull/5653 -- https://bugs.ruby-lang.org/ Unsubscribe: