Hello,
tcb is stream protocol and several messages can be queued on the pipe at the same time. That is the reason for netstring format, to be able to easily detect the boundaries of each message. If netstring format is enabled and kamailio receives several messages at once, it splits them and for each is executing the event route.
If netstring format is not used, the kamailio is executing the event route with the entire content that was read at once from the tcp connection.
Cheers,
Daniel
On 09/09/15 22:01, Jayesh Nambiar wrote:
Hello,I'm exploring the evapi module for my kamailio to interface with an external node.js app for third party stuff like AAA, billing engine tasks, notifications and so on. I followed and took some ideas from the rtjson and evapi tutorial found here(http://kb.asipto.com/kamailio:k43-async-sip-routing-nodejs) to build the node.js app consuming events.When I stress tested the scenario using SIPp and tried sending a lot of events at 300-350cps from Kamailio, I noticed that at times the client is receiving 2-3 events in a single message together although I do event_sync_relay once per SIP message received and have netstrings enabled. I believe this is a typical behavior of TCP and needs to be handled by the client using some kind of Netstring handler. Please correct me if I'm wrong.And hence I'd like to know what particularly needs to be taken care of while writing a client that is listening for events on raw tcp socket and how does kamailio handle this situation while receiving messages over TCP socket?? Does kamailio recognize the end of netstring properly on evapi:message-received and give exactly one message to take care of on every "message-received" event or should that be handled in the script somewhere !!I also referred cgrates client over evapi example which is written in GO, but I couldnt find them handling TCP streams clearly either.I'd really appreciate some expert suggestion here to make an informed decision on using the evapi module for a large scale solution.
Thanks,
- Jayesh
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