Hello,
just to let you know about some new features related to config preprocessing. 3.0 added config preprocessor directives such as 'include_file' and 'define'. But the define could be used only to control which parts of config file are active.
Several days ago I committed the code to allow you 'define' values for IDs, like:
#!define MYINT 123 #!define MYSTR "xyz"
The defined IDs are replaced at startup, during config parsing, e.g.,:
$var(x) = 100 + MYINT;
- is read as:
$var(x) = 100 + 123;
Moreover, you can have multi-line defined IDs:
#!define IDLOOP $var(i) = 0; \ while($var(i)<5) { \ xlog("++++ $var(i)\n"); \ $var(i) = $var(i) + 1; \ }
- then in routing block
route { ... IDLOOP ... }
A completely new thing is the substitution preprocessor directive:
#!subst "/regexp/subst/"
Defined IDs are not replaced within string values (because a cfg IDs is a standalone alphanumeric token, not enclosed in single or double quotes), so if you need to change something inside a string within config file, then use substitution. For example, if you want to replace the password in all db_url module parameters:
#!subst "/DBPASSWD/xyz/"
modparam("acc", "db_url", "mysql://user:DBPASSWD@localhost/db") modparam("auth_db", "db_url", "mysql://user:DBPASSWD@localhost/db")
The value of a 'subst' directive can be any valid perl-like substitution expression, you can use wildcards, group tokens, backreferences, ....
Hope this will make your cfg scripting easier. Testing and feedback is appreciated.
Cheers, Daniel