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Switch psql's TAP test for query cancellation to use IPC::Run::signal()

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Previously, the test relied on a trick with a shell to retrieve the PID
of the psql session to be stopped with SIGINT, that was skipped on
Windows.  This commit changes the test to use IPC::Run::signal()
instead, which still does not work on Windows, but for a different
reason: SIGINT would stop the test before finishing.

This should allow the test to run on non-Windows platforms where PPID is
not supported (like NetBSD), spreading it a bit more across the
buildfarm.  And the logic of the test is simpler.

It is the first time in the tree that IPC::Run::signal() is used, so, as
a matter of safety (or just call that as me having cold feet), no
backpatch is done, at least for now.

Author: Yugo NAGATA
Reviewed-by: Fabien Coelho
Discussion: https://postgr.es/m/20230810125935.22c2922ea5250ba79358965b@sraoss.co.jp
This commit is contained in:
Michael Paquier 2023-09-13 10:10:04 +09:00
parent c53e288dba
commit 522a31ac87
1 changed files with 2 additions and 36 deletions
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38
src/bin/psql/t/020_cancel.pl
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@ -10,18 +10,11 @@ use Test::More;
use Time::HiRes qw(usleep);
# Test query canceling by sending SIGINT to a running psql
#
# There is, as of this writing, no documented way to get the PID of
# the process from IPC::Run. As a workaround, we have psql print its
# own PID (which is the parent of the shell launched by psql) to a
# file.
if ($windows_os)
{
plan skip_all => "cancel test requires a Unix shell";
plan skip_all => 'sending SIGINT on Windows terminates the test itself';
}
my $tempdir = PostgreSQL::Test::Utils::tempdir;
my $node = PostgreSQL::Test::Cluster->new('main');
$node->init;
$node->start;
@ -29,36 +22,9 @@ $node->start;
local %ENV = $node->_get_env();
my ($stdin, $stdout, $stderr);
# Test whether shell supports $PPID. It's part of POSIX, but some
# pre-/non-POSIX shells don't support it (e.g., NetBSD).
$stdin = "\\! echo \$PPID";
IPC::Run::run([ 'psql', '-X', '-v', 'ON_ERROR_STOP=1' ],
'<', \$stdin, '>', \$stdout, '2>', \$stderr);
$stdout =~ /^\d+$/ or skip "shell apparently does not support \$PPID", 2;
# Now start the real test
my $h = IPC::Run::start([ 'psql', '-X', '-v', 'ON_ERROR_STOP=1' ],
\$stdin, \$stdout, \$stderr);
# Get the PID
$stdout = '';
$stderr = '';
$stdin = "\\! echo \$PPID >$tempdir/psql.pid\n";
pump $h while length $stdin;
my $count;
my $psql_pid;
until (
-s "$tempdir/psql.pid"
and
($psql_pid = PostgreSQL::Test::Utils::slurp_file("$tempdir/psql.pid"))
=~ /^\d+\n/s)
{
($count++ < 100 * $PostgreSQL::Test::Utils::timeout_default)
or die "pid file did not appear";
usleep(10_000);
}
# Send sleep command and wait until the server has registered it
$stdin = "select pg_sleep($PostgreSQL::Test::Utils::timeout_default);\n";
pump $h while length $stdin;
@ -67,7 +33,7 @@ $node->poll_query_until('postgres',
) or die "timed out";
# Send cancel request
kill 'INT', $psql_pid;
$h->signal('INT');
my $result = finish $h;