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download-from-binary-cache.pl: Show if we're waiting for a URL 

Previously, if a binary cache is hanging/unreachable/slow,
download-from-binary-cache.pl would also hang without any indication
to the user.  Now, if fetching a URL takes more than 5 seconds, it
will print a message to that effect.
This commit is contained in:
Eelco Dolstra 2013-06-07 15:33:44 +02:00
parent ca70fba0bf
commit 24e063efdc
1 changed files with 15 additions and 3 deletions
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18
scripts/download-from-binary-cache.pl.in
View File

@ -24,8 +24,9 @@ my $ttlNegative = 24 * 3600; # when to purge negative lookups from the database
my $ttlNegativeUse = 3600; # how long negative lookups are valid for non-"have" lookups
my $didExpiration = 0;
my $showAfter = 5; # show that we're waiting for a request after this many seconds
my $debug = ($ENV{"NIX_DEBUG_SUBST"} // "") eq 1;
open(STDERR, ">>/dev/tty") if $debug;
my $cacheFileURLs = ($ENV{"_NIX_CACHE_FILE_URLS"} // "") eq 1; # for testing
@ -46,7 +47,8 @@ sub addRequest {
my $curl = WWW::Curl::Easy->new;
my $curlId = $curlIdCount++;
$requests{$curlId} = { storePath => $storePath, url => $url, handle => $curl, content => "", type => $head ? "HEAD" : "GET" };
$requests{$curlId} = { storePath => $storePath, url => $url, handle => $curl, content => "", type => $head ? "HEAD" : "GET"
, shown => 0, started => time() };
$curl->setopt(CURLOPT_PRIVATE, $curlId);
$curl->setopt(CURLOPT_URL, $url);
@ -76,7 +78,7 @@ sub processRequests {
# Sleep until we can read or write some data.
if (scalar @{$rfds} + scalar @{$wfds} + scalar @{$efds} > 0) {
IO::Select->select(IO::Select->new(@{$rfds}), IO::Select->new(@{$wfds}), IO::Select->new(@{$efds}), 0.1);
IO::Select->select(IO::Select->new(@{$rfds}), IO::Select->new(@{$wfds}), IO::Select->new(@{$efds}), 1.0);
}
if ($curlm->perform() != $activeRequests) {
@ -101,6 +103,16 @@ sub processRequests {
}
}
}
my $time = time();
while (my ($key, $request) = each %requests) {
next unless defined $request->{handle};
next if $request->{shown};
if ($time > $request->{started} + $showAfter) {
print STDERR "still waiting for ‘$request->{url}’ after $showAfter seconds...\n";
$request->{shown} = 1;
}
}
}
}