Re: [pmg-devel] [PATCH pmg-api v2 5/7] revised task log download function in the PMG backend

[Daniel Tschlatscher <d.tschlatscher@proxmox.com>]

On 9/8/22 11:36, Stefan Sterz wrote:
> On 9/7/22 10:56, Daniel Tschlatscher wrote:
>> With the newly added button in the tasklog the implementation for the
>> PMG server needs to be adapted. I saw an opportunity here to clear
>> some redundant code for displaying the tasklog and replace it with a
>> call to dump_logfile(), akin to how this is handled in pve-manager.
>>
>> The tasklog download functionality now streams the file by invoking
>> the newly created function in pve-common.
>>
>> Signed-off-by: Daniel Tschlatscher <d.tschlatscher@proxmox.com>
>> ---
>>  src/PMG/API2/Tasks.pm | 34 +++++++++++-----------------------
>>  1 file changed, 11 insertions(+), 23 deletions(-)
>>
>> diff --git a/src/PMG/API2/Tasks.pm b/src/PMG/API2/Tasks.pm
>> index 598fb4d..0fd3780 100644
>> --- a/src/PMG/API2/Tasks.pm
>> +++ b/src/PMG/API2/Tasks.pm
>> @@ -5,6 +5,7 @@ use warnings;
>>  use POSIX;
>>  use IO::File;
>>  use File::ReadBackwards;
>> +use File::stat;
>>  use PVE::Tools;
>>  use PVE::SafeSyslog;
>>  use PVE::RESTHandler;
>> @@ -272,33 +273,20 @@ __PACKAGE__->register_method({
>>  
>>  	my $restenv = PMG::RESTEnvironment->get();
>>  
>> -	my $fh = IO::File->new($filename, "r");
>> -	raise_param_exc({ upid => "no such task - unable to open file - $!" }) if !$fh;
>> +	my $start = $param->{start} // 0;
>> +	my $limit = $param->{limit} // 50;
>>  
>> -	my $start = $param->{start} || 0;
>> -	my $limit = $param->{limit} || 50;
>> -	my $count = 0;
>> -	my $line;
>> -	while (defined ($line = <$fh>)) {
>> -	    next if $count++ < $start;
>> -	    next if $limit <= 0;
>> -	    chomp $line;
>> -	    push @$lines, { n => $count, t => $line};
>> -	    $limit--;
>> -	}
>> +	if ($limit == 0) {
>> +	    # TCP Max Transfer Unit size is 1500, compression for lower numbers has no effect
>> +	    my $use_compression = stat($filename)->size > 1500;
>> +	    return PVE::Tools::stream_logfile($filename, $param->{upid}, $use_compression);
> 
> I am pretty sure that should be `stream_file` and not `stream_logfile`.
> We've already discussed this off list, but I wanted to document it here too.
> 
Thanks for catching this!
Yes, I switched something up here when preparing the series. The
function call here should be "stream_file".
>> +	} else {
>> +	    my ($count, $lines) = PVE::Tools::dump_logfile($filename, $start, $limit);
>>  
>> -	close($fh);
>> +	    $restenv->set_result_attrib('total', $count);
>>  
>> -	# HACK: ExtJS store.guaranteeRange() does not like empty array
>> -	# so we add a line
>> -	if (!$count) {
>> -	    $count++;
>> -	    push @$lines, { n => $count, t => "no content"};
>> +	    return $lines;
>>  	}
>> -
>> -	$restenv->set_result_attrib('total', $count);
>> -
>> -	return $lines;
>>      }});
>>  
>>  
>