Re: [Cppcms-users] upload progress

[Frank E. <fra...@an...>]

hi,

after some research i found the following facts to be helpful for upload
progress using nginx with cppcms backend in fastcgi mode:

i implemented some global object to track running uploads in cppcms.
after i got it running i learned that nginx buffers the _complete_ post
before sending it to the fastcgi backend. this is by design and not
alterable.

i also stumbled upon a nginx module which can be used to implement
upload progress indicators using java script and XHR - solved completely
within nginx.

so i found what i searched for (upload progress indicator), but this
also means that

- cppcms with nginx can not be used to 'stream' post data directly to
cppcms backend in fastcgi mode
- nginx always cashes post requests and sends them then completely to
the fastcgi backend (cppcms) which does not block cppcms while receiving
data from a slow connection (which could be a good thing)
- i don't need to patch cppcms to support progress indicatorrs for post
requests (which i'm glad about)

though this is not really new it might help a little bit. it's fo sure
something to be mentioned in the documentation when the upload handling
is changed in RC1. as i understood this will offer the possibility to
abort a running upload; well if you have nginx in front it might not
work as expected.

http://wiki.nginx.org/NginxHttpUploadProgressModule - lighthttpd also
has a module like that.

regards,

frank

Am 18.07.2010 13:34, schrieb Artyom:
>>
>> it should be simple and simple to  use. since i now need this
>> functionality i'll try to hack something in the  the current library
>> version, but it won't be a beautiful solution and i'd  like to replace it
>> as soosn as available with a version from  upstream.
>>
>> frank
>>
> 
> 
> For this you may take a look on: 
> 
> - http_file.cpp, which handles incoming chunks.
> - cgi_api.cpp functions: load_content and on_some_multipart_read
> 
> Note: at this point there is no associations with an application yet, 
>       and there is no session information loaded, so you should be very careful
>       with the assumptions of what you can actually do.
> 
> Artyom
> 
> 
>       
> 
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