Re: [Pan-devel] where in the code would I address server I/O errors and retries

[Heinrich Müller]

Am 14.11.2013 13:54, schrieb Rob:
> I'm a QT programmer so I'm not too well acquainted with the gtk callback 
> structure.  I need to find the server I/O functions in the code to address a 
> problem with a non-RFC compliant usenet service.
>
> It seems that a trend these days with the large usenet providers is to NOT hold all 
> content locally on their servers, but to onlyinitially receive headers and to only cache 
> articles locally when they are requested by a client.  This process breaks nntp fairly 
> easily if there is any substantial delay between the client requesting an article and the 
> provider going out and finding it.  I'm not convinced that pan is handling this as well 
> as can be.  Another concern I have is that when pan issues a GROUP command that the 
> "last" article number is invalid...meaning that way too often the server 
> responds with a 501 error code when chunks of article headers in the value group range 
> are retrieved.
>
> In simplest terms I'd like to make sure that pan is retying some number of 
> times when a 501 error response is generated with downloading new article 
> headers.  My understanding is that header downloading would use the XHDR 
> command and download in chunks...well, sometimes the requested chunk generates 
> the non-conformant 501 error.  I want to check for this and retry when it 
> happens.
take a look at nntp.cc and task-xover.cc
nntp does the error handling and task-xover receives the headers and 
updates the internal data with new headers and stuff
on a deeper level, there are the socket-impl* classes.
> On a related note, the regular expression capabilities don't seem to be 
> documented at all and I have yet to figure out what dialect of regular 
> expressions are supported when searching the Subject: field...or if the RE 
> functions are well supported and tested in the application.
I thinks it's a perl regex derivate.
Cheers.