Hi,
where is the best place to add a connection pool, for proxy backends
into nginx?
cheers
Aleks
On Sun, Nov 18, 2007 at 04:00:37PM +0100, Aleksandar L. wrote:
where is the best place to add a connection pool, for proxy backends
into nginx?
A connection pool by itself could be easy added.
The problem is backend’s chunked HTTP/1.1 responses.
On Mon 19.11.2007 09:59, Igor S. wrote:
On Sun, Nov 18, 2007 at 04:00:37PM +0100, Aleksandar L. wrote:
where is the best place to add a connection pool, for proxy backends
into nginx?A connection pool by itself could be easy added.
Ok, I think in src/core/ngx_connection.c and a queue algo, right?
The problem is backend’s chunked HTTP/1.1 responses.
Step by step 
1.) add connection pools
2.) keepalive vor backends, due the fact that in the frontend this is
allready there and pass the chunked response 1:1 to client, like a
gateway
3.) plan how to add the other HTTP/1.1 feature to the proxy module,
which is very tricky for some parts, imho.
Cheers
Aleks
Aleksandar L. ha scritto:
On Mon 19.11.2007 09:59, Igor S. wrote:
On Sun, Nov 18, 2007 at 04:00:37PM +0100, Aleksandar L. wrote:
where is the best place to add a connection pool, for proxy backends
into nginx?A connection pool by itself could be easy added.
Ok, I think in src/core/ngx_connection.c and a queue algo, right?
I have added a queue implementation in mod_wsgi:
http://hg.mperillo.ath.cx/nginx/mod_wsgi/file/tip/src/ngx_queue.h
http://hg.mperillo.ath.cx/nginx/mod_wsgi/file/tip/src/ngx_queue.c
It uses an array.
Manlio P.
On Mon 19.11.2007 11:11, Manlio P. wrote:
I have added a queue implementation in mod_wsgi:
http://hg.mperillo.ath.cx/nginx/mod_wsgi/file/tip/src/ngx_queue.h
http://hg.mperillo.ath.cx/nginx/mod_wsgi/file/tip/src/ngx_queue.c
nice 
Do you use it for connections or something else?
Do you plan to add shared mem handling so that the queue/pool can be
shared between the forked nginx-workers?!
Due the fact that I haven’t take a look, when will be the queue
processed, is there a scheduler in nginx?!
Cheers
Aleks
Aleksandar L. ha scritto:
I have added a queue implementation in mod_wsgi:
http://hg.mperillo.ath.cx/nginx/mod_wsgi/file/tip/src/ngx_queue.h
http://hg.mperillo.ath.cx/nginx/mod_wsgi/file/tip/src/ngx_queue.cnice
Do you use it for connections or something else?
I use it for “manual” memory handling of Python objects.
Each time the WSGI application iterator yields a string and writing this
string to the clients returns NGX_EAGAIN, I push the object in the
queue.
When writing to the client returns NGX_OK, I pop and deallocate all the
objects in the queue.
So far, this is the best solution I have found for this problem :).
Do you plan to add shared mem handling so that the queue/pool can be
shared between the forked nginx-workers?!
No, I do not need this.
Due the fact that I haven’t take a look, when will be the queue
processed, is there a scheduler in nginx?!
No, the queue is just a data structure.
Not sure to understand.
Cheers
Aleks
Regards Manlio P.