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While ACL args were resolved after all the config was parsed, it was not the case with sample fetch args because they're almost everywhere now. The issue is that ACLs now solely rely on sample fetches, so their args resolving doesn't work anymore. And many fetches involving a server, a proxy or a userlist don't work at all. The real issue is that at the bottom layers we have no information about proxies, line numbers, even ACLs in order to report understandable errors, and that at the top layers we have no visibility over the locations where fetches are referenced (think log node). After failing multiple unsatisfying solutions attempts, we now have a new concept of args list. The principle is that every proxy has a list head which contains a number of indications such as the config keyword, the context where it's used, the file and line number, etc... and a list of arguments. This list head is of the same type as the elements, so it serves as a template for adding new elements. This way, it is filled from top to bottom by the callers with the information they have (eg: line numbers, ACL name, ...) and the lower layers just have to duplicate it and add an element when they face an argument they cannot resolve yet. Then at the end of the configuration parsing, a loop passes over each proxy's list and resolves all the args in sequence. And this way there is all necessary information to report verbose errors. The first immediate benefit is that for the first time we got very precise location of issues (arg number in a keyword in its context, ...). Second, in order to do this we had to parse log-format and unique-id-format a bit earlier, so that was a great opportunity for doing so when the directives are encountered (unless it's a default section). This way, the recorded line numbers for these args are the ones of the place where the log format is declared, not the end of the file. Userlists report slightly more information now. They're the only remaining ones in the ACL resolving function.
43 lines
1.8 KiB
C
43 lines
1.8 KiB
C
/*
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* include/proto/sample.h
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* Functions for samples management.
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*
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* Copyright (C) 2009-2010 EXCELIANCE, Emeric Brun <ebrun@exceliance.fr>
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* Copyright (C) 2012 Willy Tarreau <w@1wt.eu>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation, version 2.1
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* exclusively.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _PROTO_SAMPLE_H
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#define _PROTO_SAMPLE_H
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#include <types/sample.h>
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#include <types/stick_table.h>
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struct sample_expr *sample_parse_expr(char **str, int *idx, char *err, int err_size, struct arg_list *al);
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struct sample *sample_process(struct proxy *px, struct session *l4,
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void *l7, unsigned int dir, struct sample_expr *expr,
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struct sample *p);
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struct sample *sample_fetch_string(struct proxy *px, struct session *l4, void *l7,
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unsigned int opt, struct sample_expr *expr);
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void sample_register_fetches(struct sample_fetch_kw_list *psl);
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void sample_register_convs(struct sample_conv_kw_list *psl);
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const char *sample_src_names(unsigned int use);
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const char *sample_ckp_names(unsigned int use);
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struct sample_fetch *find_sample_fetch(const char *kw, int len);
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int smp_resolve_args(struct proxy *p);
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#endif /* _PROTO_SAMPLE_H */
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