[sword-devel] installmgr (and xiphos) crashes (svn 2831)

Nic Carter niccarter at mac.com
Wed Jun 26 06:44:06 MST 2013


(Sorry for the top reply)

IMHO it would be easier to switch to downloading a ZIP file of the module than it would to add the infrastructure required to generate a custom listing of file names.
I encountered the issues you point out (and agree with you) & gave up. If/when the CrossWire httpd server changes (& the HTML output changes), the installmgr code will break :)

My vote, long ago, was to switch to downloading ZIP files instead of each individual module file, but no one has implemented that yet (would you mind looking, Jaak? My c++ skills are very rusty, as you have seen!) :)

Sent from my phone, hence this email may be short...

On 26/06/2013, at 23:35, Jaak Ristioja <jaak at ristioja.ee> wrote:

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> 
> On 26.06.2013 16:25, Greg Hellings wrote:
>> bserver directory listing output (which is what I think it does).
>> 
>> V E R Y   V E R Y   B A D   P R A C T I C E ! ! !
>> 
>> 
>> Parsing server output is bad practice? How in the world did you
>> reach that over-zealous conclusion?
>> 
>> --Greg
> 
> I didn't. It is not safe to assume that web servers provide similar
> output for directory listings. They might even do AJAX or something
> which might only be reasonably interpreted by human (if at all:).
> 
> Example: The current code doesn't work when links start with
>  <a id="x" href="
> because it only searches for "<a href=". Even parsing the HTML
> properly would not be enough in some cases.
> 
> Therefore, it is not reasonable to try to parse the directory listing
> output of the webserver. Instead, better mechanisms should be used,
> e.g. custom-format index files, e.g. with a format like "one
> filename/URL per line, separated by '\n' characters.". Sword would
> just need to download a single file (instead of the webserver
> directory output listing), and parse that.
> 
> This is much easier to parse and handle error conditions, no need to
> try to interpret HTML, filter links etc...
> 
> Blessings,
> Jaak
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