FastCGI server got stuck
lazarus / 38-Networking and Web Programming

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egsuh · 2020-05-12 01:27

Sometimes this happens, especially when I repeatedly send requests.
Recently I've got error message (on browser) saying failure in opening
a template file. Here's key points of my web-module.

Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i  
 interface  TwmDC1 = class(TFPWebModule)    MessageForm : TAQTemplate;
// Just a descendant of TFPTemplate having a few more fields   //
other fields and methods, of course   .....end;
 implementation constructor TAQTemplate.Create(fn: string);begin 
 inherited Create;    TargetAction := nil;   FileName := fn;      //
Here, a text file is assigned.    StartDelimiter := '<#'; 
 EndDelimiter := '>';end; procedure TwmDC1.DataModuleCreate(Sender:
TObject);begin   MessageForm := TAQTemplate.Create (MessageFormFile); 
 MessageForm.OnGetParam := SurveyGetParam;end; procedure
TwmDC1.DataModuleDestroy(Sender: TObject);begin 
 MessageForm.Free;end; 
Is there any possibility that the file of MessageForm may stay open,
or are there any way that I make sure that the file is closed just
after it is loaded? Or, will it improve performance if I store the
content of the template file within the memory, e.g. as content of a
template of an action?

I'm not sure whether this is the cause of the "stuck". But suspect
that writing files on HDD (saving log data at a file, etc.)  may be
one of the possible reasons.  Or slow response from database may be
also possible cause.

"Got stuck" goes away after a few minutes without any operation on the
server. I refresh the web browser, and get what I want.

Server is not proper server --- it is a PC with Windows 10 / IIS,
serving on DDNS.  I'm testing at harsh conditions.  This machine also
runs Firebird server.

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devEric69 · 2020-05-12 07:46

Hello,

Concerning logging an environment with multiple threads or multi-forks
or multi-instances, I would use one file per PID if I haven't already
done so ( especially since it's very simple to set up, with the unit
LCLProc ):

Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i {$IF
defined(DEBUG)}LCLProc.DebuglnThreadLog(['time=',
DateTimeToStr(Now),': ', '<<@SurveyGetParam: IN ']);{$EndIf}
...\...{$IF defined(DEBUG)}LCLProc.DebuglnThreadLog(['time=',
DateTimeToStr(Now),': ', '>>@SurveyGetParam: OUT ']);{$EndIf}
QuoteSometimes this happens, especially when I repeatedly send
requests. Recently I've got error message (on browser) saying failure
in opening a template file.
[snip]
Is there any possibility that the file of MessageForm may stay open,
or are there any way that I make sure that the file is closed just
after it is loaded?
I don't know too (no expertise in FastCGI).

Regards