[OpenSIPS-Devel] [opensips] load_balancer module enhancements (#345)

[Sergey KHripchenko]

@bogdan-iancu, here it is, i'm back with proposed commits and changes:

1. get rid of load_balance() in favor of lb_*() family of functions to make the work-flow more clear and defined:
       lb_start(grp, rl, flgs) - strictly used to start LB session. if sessions already started, old session will be lost and re-started again.
       lb_next() - strictly used to to continue LB session previously started by lb_start().
       lb_is_started() - used to check whenever LB session is already started or not.
       lb_reset() - used to clean up LB session and everything LB internally does for this dialog.
       ln_disable_dst() - mark destination currently chosen by LB in current active LB session as disabled.
       lb_start_and_next(grp, rl, flgs) - is simply a shorthand for 'lb_is_started()?lb_next():lb_start()' to simplify scripting.
                 this function logically almost the same as old load_balance() function,
                 so we could leave old name for compatibility reasons.
       lb_count_call(......) - manually register call as a load for particular resource(es).

2. lb_start(..., alg) parameter changed to 'flags' parameter with possible values:
      'r' - use relative versus absolute estimation
      'n' - do not skip negative loads

3. new module parameter 'probing_verbose' to log INFO message whenever we enable/disable destinations by probing/MI.


Could you please review it and give a feedback.

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Reply to this email directly or view it on GitHub:
https://github.com/OpenSIPS/opensips/pull/345#issuecomment-64216763
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