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Diffstat (limited to 'source/configuration/modules/idx_stringgen.rst')
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diff --git a/source/configuration/modules/idx_stringgen.rst b/source/configuration/modules/idx_stringgen.rst new file mode 100644 index 0000000..221f0d4 --- /dev/null +++ b/source/configuration/modules/idx_stringgen.rst @@ -0,0 +1,43 @@ +String Generator Modules +======================== + +String generator modules are used, as the name implies, to generate +strings based on the message content. They are currently tightly coupled +with the template system. Their primary use is to speed up template +processing by providing a native C interface to template generation. +These modules exist since 5.5.6. To get an idea of the potential +speedup, the default file format, when generated by a string generator, +provides a roughly 5% speedup. For more complex strings, especially +those that include multiple regular expressions, the speedup may be +considerably higher. + +String generator modules are written to a quite simple interface. +However, a word of caution is due: they access the rsyslog message +object via a low-level interface. That interface is not guaranteed yet +to stay stable. So it may be necessary to modify string generator +modules if the interface changes. Obviously, we will not do that without +good reason, but it may happen. + +Rsyslog comes with a set of core, build-in string generators, which are +used to provide those default templates that we consider to be +time-critical: + +- smfile - the default rsyslog file format +- smfwd - the default rsyslog (network) forwarding format +- smtradfile - the traditional syslog file format +- smfwd - the traditional syslog (network) forwarding format + +Note that when you replace these defaults with some custom strings, you +will loose some performance (around 5%). For typical systems, this is +not really relevant. But for a high-performance systems, it may be very +relevant. To solve that issue, create a new string generator module for +your custom format, starting out from one of the default generators +provided. If you can not do this yourself, you may want to contact +`Adiscon <mailto:info%40adiscon.com>`_ as we offer custom development of +string generators at a very low price. + +Note that string generator modules can be dynamically loaded. However, +the default ones provided are so important that they are build right +into the executable. But this does not need to be done that way (and it +is straightforward to do it dynamic). + |