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Allow TestLib::slurp_file to skip contents, and use as needed

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In order to avoid getting old logfile contents certain functions in
PostgresNode were doing one of two things. On Windows it rotated the
logfile and restarted the server, while elsewhere it truncated the log
file. Both of these are unnecessary. We borrow from the buildfarm which
does this instead: note the size of the logfile before we start, and
then when fetching the logfile skip to that position before accumulating
contents. This is spelled differently on Windows but the effect is the
same. This is largely centralized in TestLib's slurp_file function,
which has a new optional parameter, the offset to skip to before
starting to reading the file. Code in the client becomes much neater.

Backpatch to all live branches.

Michael Paquier, slightly modified by me.

Discussion: https://postgr.es/m/YHajnhcMAI3++pJL@paquier.xyz
This commit is contained in:
Andrew Dunstan
2021-04-16 16:54:04 -04:00
parent c7f0275fbd
commit 4c9298130a
2 changed files with 16 additions and 8 deletions
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8
src/test/perl/PostgresNode.pm
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@ -1616,9 +1616,6 @@ sub command_checks_all
Run a command on the node, then verify that $expected_sql appears in the
server log file.
Reads the whole log file so be careful when working with large log outputs.
The log file is truncated prior to running the command, however.
=cut
sub issues_sql_like
@ -1628,10 +1625,11 @@ sub issues_sql_like
local $ENV{PGHOST} = $self->host;
local $ENV{PGPORT} = $self->port;
truncate $self->logfile, 0;
my $log_location = -s $self->logfile;
my $result = TestLib::run_log($cmd);
ok($result, "@$cmd exit code 0");
my $log = TestLib::slurp_file($self->logfile);
my $log = TestLib::slurp_file($self->logfile, $log_location);
like($log, $expected_sql, "$test_name: SQL found in server log");
return;
}