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Stream files from store instead of buffering them

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When an artifact is requested from hydra the output is first copied
from the nix store into memory and then sent as a response, delaying
the download and taking up significant amounts of memory.

As reported in https://github.com/NixOS/hydra/issues/1357

Instead of calling a command and blocking while reading in the entire
output, this adds read_into_socket(). the function takes a
command, starting a subprocess with that command, returning a file
descriptor attached to stdout.
This file descriptor is then by responsebuilder of Catalyst to steam
the output directly
This commit is contained in:
71rd 2024-08-03 10:36:10 +00:00 committed by Yureka
parent 4b107e6ff3
commit 9b5ac87de7
2 changed files with 13 additions and 1 deletions
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2
src/lib/Hydra/Controller/Build.pm
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@ -240,7 +240,7 @@ sub serveFile {
# XSS hole.
$c->response->header('Content-Security-Policy' => 'sandbox allow-scripts');
$c->stash->{'plain'} = { data => grab(cmd => ["nix", "--experimental-features", "nix-command",
$c->stash->{'plain'} = { data => readIntoSocket(cmd => ["nix", "--experimental-features", "nix-command",
"store", "cat", "--store", getStoreUri(), "$path"]) };
# Detect MIME type.

12
src/lib/Hydra/Helper/Nix.pm
View file

@ -36,6 +36,7 @@ our @EXPORT = qw(
jobsetOverview
jobsetOverview_
pathIsInsidePrefix
readIntoSocket
readNixFile
registerRoot
restartBuilds
@ -406,6 +407,17 @@ sub pathIsInsidePrefix {
return $cur;
}
sub readIntoSocket{
my (%args) = @_;
my $sock;
eval {
my $x= join(" ", @{$args{cmd}});
open($sock, "-|", $x) or die q(failed to open socket from command:\n $x);
};
return $sock;
}