view src/core/ngx_regex.h @ 8045:aa28c802409f

Resolver: make TCP write timer event cancelable. Similar to 70e65bf8dfd7, the change is made to ensure that the ability to cancel resolver tasks is fully controlled by the caller. As mentioned in the referenced commit, it is safe to make this timer cancelable because resolve tasks can have their own timeouts that are not cancelable. The scenario where this may become a problem is a periodic background resolve task (not tied to a specific request or a client connection), which receives a response with short TTL, large enough to warrant fallback to a TCP query. With each event loop wakeup, we either have a previously set write timer instance or schedule a new one. The non-cancelable write timer can delay or block graceful shutdown of a worker even if the ngx_resolver_ctx_t->cancelable flag is set by the API user, and there are no other tasks or connections. We use the resolver API in this way to maintain the list of upstream server addresses specified with the 'resolve' parameter, and there could be third-party modules implementing similar logic.
author Aleksei Bavshin <a.bavshin@f5.com>
date Wed, 01 Jun 2022 20:17:23 -0700
parents d07456044b61
children
line wrap: on
line source


/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#ifndef _NGX_REGEX_H_INCLUDED_
#define _NGX_REGEX_H_INCLUDED_


#include <ngx_config.h>
#include <ngx_core.h>


#if (NGX_PCRE2)

#define PCRE2_CODE_UNIT_WIDTH  8
#include <pcre2.h>

#define NGX_REGEX_NO_MATCHED   PCRE2_ERROR_NOMATCH   /* -1 */

typedef pcre2_code  ngx_regex_t;

#else

#include <pcre.h>

#define NGX_REGEX_NO_MATCHED   PCRE_ERROR_NOMATCH    /* -1 */

typedef struct {
    pcre        *code;
    pcre_extra  *extra;
} ngx_regex_t;

#endif


#define NGX_REGEX_CASELESS     0x00000001
#define NGX_REGEX_MULTILINE    0x00000002


typedef struct {
    ngx_str_t     pattern;
    ngx_pool_t   *pool;
    ngx_uint_t    options;

    ngx_regex_t  *regex;
    int           captures;
    int           named_captures;
    int           name_size;
    u_char       *names;
    ngx_str_t     err;
} ngx_regex_compile_t;


typedef struct {
    ngx_regex_t  *regex;
    u_char       *name;
} ngx_regex_elt_t;


void ngx_regex_init(void);
ngx_int_t ngx_regex_compile(ngx_regex_compile_t *rc);

ngx_int_t ngx_regex_exec(ngx_regex_t *re, ngx_str_t *s, int *captures,
    ngx_uint_t size);

#if (NGX_PCRE2)
#define ngx_regex_exec_n       "pcre2_match()"
#else
#define ngx_regex_exec_n       "pcre_exec()"
#endif

ngx_int_t ngx_regex_exec_array(ngx_array_t *a, ngx_str_t *s, ngx_log_t *log);


#endif /* _NGX_REGEX_H_INCLUDED_ */