Author: glen
Date: Sat Oct 11 22:31:54 2008
New Revision: 9904
Modified:
nagios-notify/trunk/nagios-notify
Log:
- add support for conditional templates
Modified: nagios-notify/trunk/nagios-notify
==============================================================================
--- nagios-notify/trunk/nagios-notify (original)
+++ nagios-notify/trunk/nagios-notify Sat Oct 11 22:31:54 2008
@@ -76,16 +76,144 @@
return res
}
- {
- # replace environ variables
+ # trim whitespace at both sides
+ function trim(s) {
+ gsub(/(^ *| *$)/, "", s);
+ return s;
+ }
+
+ # remove quotation marks or regexps if surrounded at both ends
+ function unquote(s, c1, c2) {
+ c1 = substr(s, 1, 1);
+ c2 = substr(s, length(s));
+ if (c1 == c2 && (c1 == "\"" || c1 == "/")) {
+ return substr(s, 2, length(s) - 2);
+ }
+ return s;
+ }
+
+ function eval_expr(left, op, right) {
+ left = unquote(left);
+ right = unquote(right);
+
+ if (op == "==") {
+ return left == right;
+
+ } else if (op == "=~") {
+ return left ~ right;
+
+ } else if (op == "!~") {
+ return left !~ right;
+
+ } else if (op == "!=") {
+ return left != right;
+
+ } else if (op == ">=") {
+ return int(left) >= int(right);
+
+ } else if (op == "<=") {
+ return int(left) <= int(right);
+
+ } else if (op == ">") {
+ return int(left) > int(right);
+
+ } else if (op == "<") {
+ return int(left) < int(right);
+
+ }
+ }
+
+ function process_expr(line, cmd, left, op, right) {
+ # proccess line. set: cmd, left, op, right
+ if (match(line, /^#if +/)) {
+ cmd = "if";
+ line = substr(line, 1 + RLENGTH);
+
+ # find left expression, operator, right expression
+ if (match(line, "^.*("OPS")")) {
+ left = trim(substr(line, 1, RLENGTH));
+ right = trim(substr(line, RSTART + RLENGTH));
+ # find op from end of left
+ if (match(left, "("OPS")$")) {
+ op = substr(left, RSTART, RLENGTH);
+ left = substr(left, 1, RSTART - 1);
+ }
+ }
+ } else if (match(line, /^#(else|endif) */)) {
+ cmd = trim(substr(line, RSTART + 1, RLENGTH - 1));
+ op = left = right = "";
+ }
+
+ # eval expression and change output control
+ if (cmd == "if") {
+ state_push(state_get() && eval_expr(left, op, right));
+ } else if (cmd == "else") {
+ state_set(!state_get());
+ } else if (cmd == "endif") {
+ state_pop();
+ }
+ }
+
+ # functions for output control
+ function state_push(flag) {
+ _stack_depth++;
+ _stack[_stack_depth] = flag;
+ }
+ function state_pop() {
+ if (_stack_depth) {
+ _stack_depth--;
+ }
+ return _stack[_stack_depth];
+ }
+ function state_set(flag) {
+ _stack[_stack_depth] = flag;
+ }
+ function state_get() {
+ return _stack[_stack_depth];
+ }
+
+ BEGIN {
+ # import environ variables
for (var in ENVIRON) {
if (substr(var, 1, length("NAGIOS_")) == "NAGIOS_") {
val = ENVIRON[var];
var = substr(var, 1 + length("NAGIOS_"));
- gsub("\$" var "\$", val);
+ # add to vars[] array
+ vars[var] = val;
}
}
+ # list of comparision operands
+ CMDS = "if|else|endif"
+ # valid operands
+ OPS = "==|=~|!~|!=|>=|<=|>|<";
+ # valid variables in expression
+ # - numbers
+ # - strings in quotes
+ # - regexps between //
+ VARS = "[0-9]+|\"[^\"]+\"|/[^/]+/";
+
+ # by default we have no condition set
+ _stack_depth = 0;
+ _stack[_stack_depth] = 1;
+ }
+
+ {
+ # replace nagios macros
+ for (var in vars) {
+ val = vars[var];
+ gsub("\$" var "\$", val);
+ }
+
+ if (match($0, "^#(if *("VARS") *("OPS") *("VARS")
*$|else|endif)")) {
+ process_expr($0);
+ next;
+ }
+
+ if (!state_get()) {
+ next;
+ }
+
# $(base64:/path/to/file)
if (match($0, /\$\(base64:(.*)\)/)) {
pos = length("$(base64:")
@@ -115,7 +243,7 @@
}
# print out
- print
+ print;
}
' $tmpl
}
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