- fixes failregex, that ignores failures through some irrelevant info (closes#1623);
- ignores whole additionally irrelevant info in anchored regex before fixed failure data `\((?:auth failed, \d+ attempts( in \d+ secs)?|tried to use (disabled|disallowed) \S+ auth)\)`
- review, IPv6 compatibility fix, non-capturing groups
added helper "action.d/helpers-common.conf", and `_grep_logs` part-command for actions needed grep logs from multiple log-files
test cases: executing of some complex actions covered
- starting service in normal mode (without forking)
- does not restart if service exited normally (exit-code 0, e.g. stopped via fail2ban-client)
- does not restart if service can not start (exit-code 255, e.g. wrong configuration, etc.)
- service can be additionally started/stopped with commands (fail2ban-client, fail2ban-server)
- normalize calling parameters (persistent parameters moved from function arguments to filter member variables)
- save last line as lambda instead of return it as string (lazy convert of process line tuple to string on demand, needed in fail2ban-regex only)
- datedetector rewritten more strict as earlier;
- default templates can be specified exacter using prefix/suffix syntax (via `datepattern`);
- more as one date pattern can be specified using option `datepattern` now (new-line separated);
- some default options like `datepattern` can be specified directly in section `[Definition]`, that avoids contrary usage of unnecessarily `[Init]` section, because of performance (each extra section costs time);
- option `datepattern` can be specified in jail also (jails without filters);
- if first group specified, only this will be cut out from search log-line (e. g.: `^date:[({DATE})]` will cut out only datetime match pattern, and leaves `date:[] failure ip...` for searching in filter);
- faster match and fewer searching of appropriate templates (DateDetector.matchTime calls rarer DateTemplate.matchDate now);
- standard filters extended with exact prefixed or anchored date templates;
template cache introduced (in opposition to default template cache, holds custom templates cached by pattern for possible common usage of same template/regex);
- `datepattern = {^LN-BEG}` - only line-begin anchored default patterns
(matches date only at begin of line, or with max distance up to 2 non-alphanumeric characters from line-begin);
- `datepattern = {*WD-BEG}` - only word-begin anchored default patterns;
- `datepattern = ^prefix{DATE}suffix` - exact specified default patterns (using prefix and suffix);
common filter configs gets a more precise, line-begin anchored (datepattern = {^LN-BEG}) resp. custom anchoring default date-patterns;
sebres