Annotation of embedaddon/nginx/src/http/modules/ngx_http_degradation_module.c, revision 1.1
1.1 ! misho 1:
! 2: /*
! 3: * Copyright (C) Igor Sysoev
! 4: * Copyright (C) Nginx, Inc.
! 5: */
! 6:
! 7:
! 8: #include <ngx_config.h>
! 9: #include <ngx_core.h>
! 10: #include <ngx_http.h>
! 11:
! 12:
! 13: typedef struct {
! 14: size_t sbrk_size;
! 15: } ngx_http_degradation_main_conf_t;
! 16:
! 17:
! 18: typedef struct {
! 19: ngx_uint_t degrade;
! 20: } ngx_http_degradation_loc_conf_t;
! 21:
! 22:
! 23: static ngx_conf_enum_t ngx_http_degrade[] = {
! 24: { ngx_string("204"), 204 },
! 25: { ngx_string("444"), 444 },
! 26: { ngx_null_string, 0 }
! 27: };
! 28:
! 29:
! 30: static void *ngx_http_degradation_create_main_conf(ngx_conf_t *cf);
! 31: static void *ngx_http_degradation_create_loc_conf(ngx_conf_t *cf);
! 32: static char *ngx_http_degradation_merge_loc_conf(ngx_conf_t *cf, void *parent,
! 33: void *child);
! 34: static char *ngx_http_degradation(ngx_conf_t *cf, ngx_command_t *cmd,
! 35: void *conf);
! 36: static ngx_int_t ngx_http_degradation_init(ngx_conf_t *cf);
! 37:
! 38:
! 39: static ngx_command_t ngx_http_degradation_commands[] = {
! 40:
! 41: { ngx_string("degradation"),
! 42: NGX_HTTP_MAIN_CONF|NGX_CONF_TAKE1,
! 43: ngx_http_degradation,
! 44: NGX_HTTP_MAIN_CONF_OFFSET,
! 45: 0,
! 46: NULL },
! 47:
! 48: { ngx_string("degrade"),
! 49: NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
! 50: ngx_conf_set_enum_slot,
! 51: NGX_HTTP_LOC_CONF_OFFSET,
! 52: offsetof(ngx_http_degradation_loc_conf_t, degrade),
! 53: &ngx_http_degrade },
! 54:
! 55: ngx_null_command
! 56: };
! 57:
! 58:
! 59: static ngx_http_module_t ngx_http_degradation_module_ctx = {
! 60: NULL, /* preconfiguration */
! 61: ngx_http_degradation_init, /* postconfiguration */
! 62:
! 63: ngx_http_degradation_create_main_conf, /* create main configuration */
! 64: NULL, /* init main configuration */
! 65:
! 66: NULL, /* create server configuration */
! 67: NULL, /* merge server configuration */
! 68:
! 69: ngx_http_degradation_create_loc_conf, /* create location configuration */
! 70: ngx_http_degradation_merge_loc_conf /* merge location configuration */
! 71: };
! 72:
! 73:
! 74: ngx_module_t ngx_http_degradation_module = {
! 75: NGX_MODULE_V1,
! 76: &ngx_http_degradation_module_ctx, /* module context */
! 77: ngx_http_degradation_commands, /* module directives */
! 78: NGX_HTTP_MODULE, /* module type */
! 79: NULL, /* init master */
! 80: NULL, /* init module */
! 81: NULL, /* init process */
! 82: NULL, /* init thread */
! 83: NULL, /* exit thread */
! 84: NULL, /* exit process */
! 85: NULL, /* exit master */
! 86: NGX_MODULE_V1_PADDING
! 87: };
! 88:
! 89:
! 90: static ngx_int_t
! 91: ngx_http_degradation_handler(ngx_http_request_t *r)
! 92: {
! 93: ngx_http_degradation_loc_conf_t *dlcf;
! 94:
! 95: dlcf = ngx_http_get_module_loc_conf(r, ngx_http_degradation_module);
! 96:
! 97: if (dlcf->degrade && ngx_http_degraded(r)) {
! 98: return dlcf->degrade;
! 99: }
! 100:
! 101: return NGX_DECLINED;
! 102: }
! 103:
! 104:
! 105: ngx_uint_t
! 106: ngx_http_degraded(ngx_http_request_t *r)
! 107: {
! 108: time_t now;
! 109: ngx_uint_t log;
! 110: static size_t sbrk_size;
! 111: static time_t sbrk_time;
! 112: ngx_http_degradation_main_conf_t *dmcf;
! 113:
! 114: dmcf = ngx_http_get_module_main_conf(r, ngx_http_degradation_module);
! 115:
! 116: if (dmcf->sbrk_size) {
! 117:
! 118: log = 0;
! 119: now = ngx_time();
! 120:
! 121: /* lock mutex */
! 122:
! 123: if (now != sbrk_time) {
! 124:
! 125: /*
! 126: * ELF/i386 is loaded at 0x08000000, 128M
! 127: * ELF/amd64 is loaded at 0x00400000, 4M
! 128: *
! 129: * use a function address to subtract the loading address
! 130: */
! 131:
! 132: sbrk_size = (size_t) sbrk(0) - ((uintptr_t) ngx_palloc & ~0x3FFFFF);
! 133: sbrk_time = now;
! 134: log = 1;
! 135: }
! 136:
! 137: /* unlock mutex */
! 138:
! 139: if (sbrk_size >= dmcf->sbrk_size) {
! 140: if (log) {
! 141: ngx_log_error(NGX_LOG_NOTICE, r->connection->log, 0,
! 142: "degradation sbrk:%uzM",
! 143: sbrk_size / (1024 * 1024));
! 144: }
! 145:
! 146: return 1;
! 147: }
! 148: }
! 149:
! 150: return 0;
! 151: }
! 152:
! 153:
! 154: static void *
! 155: ngx_http_degradation_create_main_conf(ngx_conf_t *cf)
! 156: {
! 157: ngx_http_degradation_main_conf_t *dmcf;
! 158:
! 159: dmcf = ngx_pcalloc(cf->pool, sizeof(ngx_http_degradation_main_conf_t));
! 160: if (dmcf == NULL) {
! 161: return NULL;
! 162: }
! 163:
! 164: return dmcf;
! 165: }
! 166:
! 167:
! 168: static void *
! 169: ngx_http_degradation_create_loc_conf(ngx_conf_t *cf)
! 170: {
! 171: ngx_http_degradation_loc_conf_t *conf;
! 172:
! 173: conf = ngx_palloc(cf->pool, sizeof(ngx_http_degradation_loc_conf_t));
! 174: if (conf == NULL) {
! 175: return NULL;
! 176: }
! 177:
! 178: conf->degrade = NGX_CONF_UNSET_UINT;
! 179:
! 180: return conf;
! 181: }
! 182:
! 183:
! 184: static char *
! 185: ngx_http_degradation_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
! 186: {
! 187: ngx_http_degradation_loc_conf_t *prev = parent;
! 188: ngx_http_degradation_loc_conf_t *conf = child;
! 189:
! 190: ngx_conf_merge_uint_value(conf->degrade, prev->degrade, 0);
! 191:
! 192: return NGX_CONF_OK;
! 193: }
! 194:
! 195:
! 196: static char *
! 197: ngx_http_degradation(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
! 198: {
! 199: ngx_http_degradation_main_conf_t *dmcf = conf;
! 200:
! 201: ngx_str_t *value, s;
! 202:
! 203: value = cf->args->elts;
! 204:
! 205: if (ngx_strncmp(value[1].data, "sbrk=", 5) == 0) {
! 206:
! 207: s.len = value[1].len - 5;
! 208: s.data = value[1].data + 5;
! 209:
! 210: dmcf->sbrk_size = ngx_parse_size(&s);
! 211: if (dmcf->sbrk_size == (size_t) NGX_ERROR) {
! 212: ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
! 213: "invalid sbrk size \"%V\"", &value[1]);
! 214: return NGX_CONF_ERROR;
! 215: }
! 216:
! 217: return NGX_CONF_OK;
! 218: }
! 219:
! 220: ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
! 221: "invalid parameter \"%V\"", &value[1]);
! 222:
! 223: return NGX_CONF_ERROR;
! 224: }
! 225:
! 226:
! 227: static ngx_int_t
! 228: ngx_http_degradation_init(ngx_conf_t *cf)
! 229: {
! 230: ngx_http_handler_pt *h;
! 231: ngx_http_core_main_conf_t *cmcf;
! 232:
! 233: cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);
! 234:
! 235: h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers);
! 236: if (h == NULL) {
! 237: return NGX_ERROR;
! 238: }
! 239:
! 240: *h = ngx_http_degradation_handler;
! 241:
! 242: return NGX_OK;
! 243: }
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