11 Mar
2016
11 Mar
'16
11:02 a.m.
The current implementation uses curl_easy_init() to create a CURL easy handle and
curl_easy_cleanup() to destroy the handle, including all open connections within it.
If curl_easy_cleanup() isn't called, it's possible to reuse an open connection for
the next http call. To reset the CURL options, curl_easy_reset() can be used instead.
[http_client_keep_connections_open.diff](https://github.com/kamailio/kamailio/files/168832/http_client_keep_connections_open.txt)
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15 Mar
15 Mar
2:48 p.m.
Discussed this with Daniel and in general it's ok. What I wonder is if we in order to
support this properly in the case if we access two or more servers need to move the
connection data structure somewhere else, like in process memory but indexed on http_con
objects or simply reset it if the http_con object is different from the previous one used
in the same process. If you don't understand this confusing message, please report so
and I'll try to explain better - just wanted to write down this thought before it
disappeared in the mists of a confused mind...
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3:04 p.m.
The purpose of this feature is to eliminate the TCP/TLS handshake for every query. I
wouldn't think calling reset + set_options was the significant bit.
The tricky bit comes when two servers are used and the process is constantly alternating
between them. Do we need to store a 'CURL' object for each http_con in this case?
Or can the "CURL" object maintain a pool of open connections and select the
correct one based on the specified URL + options?
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3:10 p.m.
Exactly. We may have to have a pkg-memory array of connections related to the connection
objects. This needs to be reset if there's a config reload at some point. The benefits
are huge, so this is an important enhancement.
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3:16 p.m.
According to this: https://curl.haxx.se/libcurl/c/CURLOPT_MAXCONNECTS.html , libcurl can
per default keep up to 5 open persistent connections in the handle. So as long as 5 or
fewer connections are used, everything is fine.
Perhaps there should be a module option to set this to a higher value?
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30 Mar
30 Mar
9:41 a.m.
New subject: [kamailio/kamailio] module http_client - support for keeping connections open (#542)
Sorry, this won't make it into 4.4. I think this would be a very useful addition
though and hope to get time to get back to it.
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2 Apr
2 Apr
8:48 a.m.
New subject: [kamailio/kamailio] module http_client - support for keeping connections open (#542)
Well if we have one handle per curl con everything will be fine. I have some new code in
master that splits up configuration in shared memory and some data like last result code
and redirect URL in package memory which is per process. If we move the curl handle into
package memory we can have one handle per connection. We just need to make sure we clean
up properly. I think the infrastructure for getting this done is on it's way by the
latest commits, just need to run more tests and make sure the memory handling works as
planned.
As I want to be able to reload the configuration file at some point, we need to figure out
how to handle that too.
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3 Apr
3 Apr
10:14 a.m.
New subject: [kamailio/kamailio] module http_client - support for keeping connections open (#542)
Committed code to MASTER. When testing with a TLS server connection reuse saves a lot of
time. Thank you for this suggestion. Please try it out.
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20 Apr
20 Apr
9:47 a.m.
New subject: [kamailio/kamailio] module http_client - support for keeping connections open (#542)
I've tried to use the modparam "keep_connections", and it works!
But like the other default parameters, it must be specified _before_ the connection
definition to have effect, which I still find unintuitive. It would be neat if this was
documented.
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9:49 a.m.
New subject: [kamailio/kamailio] module http_client - support for keeping connections open (#542)
You are right. Either documentation or a fix.
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10:11 a.m.
New subject: [kamailio/kamailio] module http_client - support for keeping connections open (#542)
Thank you for testing!
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21 Apr
21 Apr
10:42 p.m.
New subject: [kamailio/kamailio] module http_client - support for keeping connections open (#542)
Closed #542.
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participants (3)
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filiplx -
Hugh Waite
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Olle E. Johansson