Eventscript functions: new function ctdb_check_counter().

This should eventually be able to replace ctdb_check_counter_limit()
and ctdb_check_counter_equal(), although it doesn't issue warnings
like the former.

It takes 4 optional arguments:

1. _msg - If "error" then over limit causes an error message and and
   exit 1.  Anything else fails silently but the function returns 1.
   Default is "error".

2. _op - An integer operator supported by test (e.g. -eq, -ge, -gt).
   Default is -ge.

3. _limit - Limit for the counter to be used in comparison.  Default is
   $service_fail_limit.

4. _service_name - Used to identify the counter.  Default is
   $service_name.

For example:

  ctdb_check_counter error -ge 5 foo

will print a message and exit 1 if the counter for foo is >= 5,
whereas

  ctdb_check_counter check -ge 5 foo

will just return 1 if the counter for foo is >= 5, and

  ctdb_counter_check

with print a message and exit 1 if the counter for $service_name is >=
$service_fail_limit.

Signed-off-by: Martin Schwenke <martin@meltin.net>

diff --git a/config/functions b/config/functions
index 39daeb7eb519d39102b57a01f88235ff1d2f620c..e685c07ace7e6555933e084a63781d247d38f341 100755 (executable)
--- a/config/functions
+++ b/config/functions
@@ -545,6 +545,24 @@ ctdb_check_counter_equal () {
     fi
     return 0
 }
+ctdb_check_counter () {
+    _msg="${1:-error}"  # "error"  - anything else is silent on fail
+    _op="${2:--ge}"  # an integer operator supported by test
+    _limit="${3:-${service_fail_limit}}"
+    shift 3
+    _ctdb_counter_common "$1"
+
+    # unary counting!
+    _size=$(stat -c "%s" "$_counter_file" 2>/dev/null || echo 0)
+    if [ $_size $_op $_limit ] ; then
+       if [ "$_msg" = "error" ] ; then
+           echo "ERROR: $_limit consecutive failures for $_service_name, marking node unhealthy"
+           exit 1              
+       else
+           return 1
+       fi
+    fi
+}
 
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