Welcome the channel on the development of Cro, a set of libraries for building reactive distributed systems, lovingly crafted to take advantage of all the Raku Programming Language has to offer (cro.services). This channel is being logged for historical purposes.
Set by lizmat on 24 May 2021.
nine I managed to reproduce the leak with a pure in-memory application. I think what happens is that the responses get stuck in the Supply returned from Cro::TLS::Replier.sinker. 07:19
I only discovered this accidentally, since for my implementation of sinker I didn't look at the docs, so I didn't have it return a Supply. When I corrected this, the leak appeared again. 07:20
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nine Ok, it's got nothing to do with Cro after all. I could golf it down to just gist.github.com/niner/e21d3268d479...85b2bce7e2 10:51
Oh, all it really needs is just: my $supplier = Supplier.new; my $sinker = supply { whenever $supplier.Supply { whenever Supply.interval(1) { } } }; my $tap = $sinker.tap; loop { $supplier.emit: 1; } 10:55
lizmat nine: lack of back pressure? 11:04
nine Don't think so. Tests show one item consumed per item produced 11:05
And in the full blown Cro application this is golfed from, the test was just doing reated requests in a loop 11:06
lizmat Initial/Final Size: 104880 / 1094216 Kbytes 11:08
Total Time: 4.69 seconds
Total CPU Usage: 31.79 seconds
that's less than 5 seconds to grow to 1G
run with -Msnapper and press control-c after 5 seconds 11:09
nine Oh, I may have a fix! 12:12
For Cro::HTTP::Middleware that is
I think my golfed example leaks because no one ever closes the interval supply. And in Cro::HTTP::Middleware it's the $connection-state.early-responses Supplier 12:13
This no longer leaks: 12:14
y $supplier = Supplier.new; my $sinker = supply { whenever $supplier.Supply -> $conn { my $s = Supply.interval(1); whenever $s { } whenever $conn { LAST $s.done; } } }; my $tap = $sinker.tap; loop { $supplier.emit: 1; }
And for Cro a `LAST $connection-state.early-responses.done;` after github.com/croservices/cro-http/bl...e.pm6#L184 seems to do the trick 12:15
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Geth cro-http: niner++ created pull request #151:
Fix Middleware::RequestResponse leaking a Supplier on every connection