Hi Sandeep,
A transformation plugin can accomplish what you want, but you will have
to setup a "dummy" HTTP origin server to provide a fake response so that
ATS has something to transform.
If you want ATS to handle the request itself without connecting to an
origin HTTP server, you can use INKHttpTxnIntercept[1] to intercept
requests that you detect can be served from ATS. If you choose to go
this route, you'll have to build the response HTTP headers as well as
the body to the client VConnection.
As far as connecting to the database, keep in mind that if a blocking
library is used database requests will block other connections on the
same thread. Using INKNetConnect with writing the protocol directly
will allow you to talk to the DB asynchronously and continue handling
other requests.
--Steve
[1]
http://trafficserver.apache.org/docs/v2/sdk/InterceptingHTTPTransactionFuncs.html
Sandeep Kalidindi at PaGaLGuY.com wrote, on 5/25/10 10:39 PM:
Hi all,
i am about to write a couple of transformation plugins to ATS
which will fetch data from the database so that all the read requests
will be taken care of by the ATS itself while write requests are passed
on to the backend servers.
was checking the architecture and it looks fine by me. wanted to ask the
community if there is any major why we should not connect to the
database from ATS before i spend considerable time on it.
Cheers,
Deepu.
