Mercurial > hg > nginx
view src/http/modules/ngx_http_degradation_module.c @ 7047:3fef8c5caa75
Proxy: split configured header names and values.
Previously, each configured header was represented in one of two ways,
depending on whether or not its value included any variables.
If the value didn't include any variables, then it would be represented
as as a single script that contained complete header line with HTTP/1.1
delimiters, i.e.:
"Header: value\r\n"
But if the value included any variables, then it would be represented
as a series of three scripts: first contained header name and the ": "
delimiter, second evaluated to header value, and third contained only
"\r\n", i.e.:
"Header: "
"$value"
"\r\n"
This commit changes that, so that each configured header is represented
as a series of two scripts: first contains only header name, and second
contains (or evaluates to) only header value, i.e.:
"Header"
"$value"
or
"Header"
"value"
This not only makes things more consistent, but also allows header name
and value to be accessed separately.
Signed-off-by: Piotr Sikora <piotrsikora@google.com>
author | Piotr Sikora <piotrsikora@google.com> |
---|---|
date | Wed, 15 Mar 2017 15:55:35 -0700 |
parents | 67653855682e |
children |
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/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_http.h> typedef struct { size_t sbrk_size; } ngx_http_degradation_main_conf_t; typedef struct { ngx_uint_t degrade; } ngx_http_degradation_loc_conf_t; static ngx_conf_enum_t ngx_http_degrade[] = { { ngx_string("204"), 204 }, { ngx_string("444"), 444 }, { ngx_null_string, 0 } }; static void *ngx_http_degradation_create_main_conf(ngx_conf_t *cf); static void *ngx_http_degradation_create_loc_conf(ngx_conf_t *cf); static char *ngx_http_degradation_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child); static char *ngx_http_degradation(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); static ngx_int_t ngx_http_degradation_init(ngx_conf_t *cf); static ngx_command_t ngx_http_degradation_commands[] = { { ngx_string("degradation"), NGX_HTTP_MAIN_CONF|NGX_CONF_TAKE1, ngx_http_degradation, NGX_HTTP_MAIN_CONF_OFFSET, 0, NULL }, { ngx_string("degrade"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, ngx_conf_set_enum_slot, NGX_HTTP_LOC_CONF_OFFSET, offsetof(ngx_http_degradation_loc_conf_t, degrade), &ngx_http_degrade }, ngx_null_command }; static ngx_http_module_t ngx_http_degradation_module_ctx = { NULL, /* preconfiguration */ ngx_http_degradation_init, /* postconfiguration */ ngx_http_degradation_create_main_conf, /* create main configuration */ NULL, /* init main configuration */ NULL, /* create server configuration */ NULL, /* merge server configuration */ ngx_http_degradation_create_loc_conf, /* create location configuration */ ngx_http_degradation_merge_loc_conf /* merge location configuration */ }; ngx_module_t ngx_http_degradation_module = { NGX_MODULE_V1, &ngx_http_degradation_module_ctx, /* module context */ ngx_http_degradation_commands, /* module directives */ NGX_HTTP_MODULE, /* module type */ NULL, /* init master */ NULL, /* init module */ NULL, /* init process */ NULL, /* init thread */ NULL, /* exit thread */ NULL, /* exit process */ NULL, /* exit master */ NGX_MODULE_V1_PADDING }; static ngx_int_t ngx_http_degradation_handler(ngx_http_request_t *r) { ngx_http_degradation_loc_conf_t *dlcf; dlcf = ngx_http_get_module_loc_conf(r, ngx_http_degradation_module); if (dlcf->degrade && ngx_http_degraded(r)) { return dlcf->degrade; } return NGX_DECLINED; } ngx_uint_t ngx_http_degraded(ngx_http_request_t *r) { time_t now; ngx_uint_t log; static size_t sbrk_size; static time_t sbrk_time; ngx_http_degradation_main_conf_t *dmcf; dmcf = ngx_http_get_module_main_conf(r, ngx_http_degradation_module); if (dmcf->sbrk_size) { log = 0; now = ngx_time(); /* lock mutex */ if (now != sbrk_time) { /* * ELF/i386 is loaded at 0x08000000, 128M * ELF/amd64 is loaded at 0x00400000, 4M * * use a function address to subtract the loading address */ sbrk_size = (size_t) sbrk(0) - ((uintptr_t) ngx_palloc & ~0x3FFFFF); sbrk_time = now; log = 1; } /* unlock mutex */ if (sbrk_size >= dmcf->sbrk_size) { if (log) { ngx_log_error(NGX_LOG_NOTICE, r->connection->log, 0, "degradation sbrk:%uzM", sbrk_size / (1024 * 1024)); } return 1; } } return 0; } static void * ngx_http_degradation_create_main_conf(ngx_conf_t *cf) { ngx_http_degradation_main_conf_t *dmcf; dmcf = ngx_pcalloc(cf->pool, sizeof(ngx_http_degradation_main_conf_t)); if (dmcf == NULL) { return NULL; } return dmcf; } static void * ngx_http_degradation_create_loc_conf(ngx_conf_t *cf) { ngx_http_degradation_loc_conf_t *conf; conf = ngx_palloc(cf->pool, sizeof(ngx_http_degradation_loc_conf_t)); if (conf == NULL) { return NULL; } conf->degrade = NGX_CONF_UNSET_UINT; return conf; } static char * ngx_http_degradation_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child) { ngx_http_degradation_loc_conf_t *prev = parent; ngx_http_degradation_loc_conf_t *conf = child; ngx_conf_merge_uint_value(conf->degrade, prev->degrade, 0); return NGX_CONF_OK; } static char * ngx_http_degradation(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) { ngx_http_degradation_main_conf_t *dmcf = conf; ngx_str_t *value, s; value = cf->args->elts; if (ngx_strncmp(value[1].data, "sbrk=", 5) == 0) { s.len = value[1].len - 5; s.data = value[1].data + 5; dmcf->sbrk_size = ngx_parse_size(&s); if (dmcf->sbrk_size == (size_t) NGX_ERROR) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid sbrk size \"%V\"", &value[1]); return NGX_CONF_ERROR; } return NGX_CONF_OK; } ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameter \"%V\"", &value[1]); return NGX_CONF_ERROR; } static ngx_int_t ngx_http_degradation_init(ngx_conf_t *cf) { ngx_http_handler_pt *h; ngx_http_core_main_conf_t *cmcf; cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module); h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers); if (h == NULL) { return NGX_ERROR; } *h = ngx_http_degradation_handler; return NGX_OK; }