Initial commit
This commit is contained in:
Hakase
@@ -0,0 +1,360 @@
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/*
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* Copyright (C) Igor Sysoev
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* Copyright (C) Maxim Dounin
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* Copyright (C) Nginx, Inc.
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*/
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#include <ngx_config.h>
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#include <ngx_core.h>
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#define NGX_MAX_DYNAMIC_MODULES 128
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static ngx_uint_t ngx_module_index(ngx_cycle_t *cycle);
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static ngx_uint_t ngx_module_ctx_index(ngx_cycle_t *cycle, ngx_uint_t type,
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ngx_uint_t index);
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ngx_uint_t ngx_max_module;
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static ngx_uint_t ngx_modules_n;
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ngx_int_t
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ngx_preinit_modules(void)
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{
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ngx_uint_t i;
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for (i = 0; ngx_modules[i]; i++) {
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ngx_modules[i]->index = i;
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ngx_modules[i]->name = ngx_module_names[i];
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}
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ngx_modules_n = i;
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ngx_max_module = ngx_modules_n + NGX_MAX_DYNAMIC_MODULES;
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return NGX_OK;
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}
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ngx_int_t
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ngx_cycle_modules(ngx_cycle_t *cycle)
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{
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/*
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* create a list of modules to be used for this cycle,
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* copy static modules to it
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*/
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cycle->modules = ngx_pcalloc(cycle->pool, (ngx_max_module + 1)
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* sizeof(ngx_module_t *));
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if (cycle->modules == NULL) {
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return NGX_ERROR;
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}
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ngx_memcpy(cycle->modules, ngx_modules,
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ngx_modules_n * sizeof(ngx_module_t *));
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cycle->modules_n = ngx_modules_n;
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return NGX_OK;
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}
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ngx_int_t
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ngx_init_modules(ngx_cycle_t *cycle)
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{
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ngx_uint_t i;
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for (i = 0; cycle->modules[i]; i++) {
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if (cycle->modules[i]->init_module) {
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if (cycle->modules[i]->init_module(cycle) != NGX_OK) {
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return NGX_ERROR;
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}
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}
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}
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return NGX_OK;
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}
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ngx_int_t
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ngx_count_modules(ngx_cycle_t *cycle, ngx_uint_t type)
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{
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ngx_uint_t i, next, max;
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ngx_module_t *module;
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next = 0;
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max = 0;
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/* count appropriate modules, set up their indices */
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for (i = 0; cycle->modules[i]; i++) {
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module = cycle->modules[i];
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if (module->type != type) {
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continue;
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}
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if (module->ctx_index != NGX_MODULE_UNSET_INDEX) {
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/* if ctx_index was assigned, preserve it */
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if (module->ctx_index > max) {
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max = module->ctx_index;
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}
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if (module->ctx_index == next) {
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next++;
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}
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continue;
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}
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/* search for some free index */
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module->ctx_index = ngx_module_ctx_index(cycle, type, next);
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if (module->ctx_index > max) {
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max = module->ctx_index;
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}
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next = module->ctx_index + 1;
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}
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/*
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* make sure the number returned is big enough for previous
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* cycle as well, else there will be problems if the number
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* will be stored in a global variable (as it's used to be)
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* and we'll have to roll back to the previous cycle
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*/
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if (cycle->old_cycle && cycle->old_cycle->modules) {
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for (i = 0; cycle->old_cycle->modules[i]; i++) {
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module = cycle->old_cycle->modules[i];
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if (module->type != type) {
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continue;
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}
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if (module->ctx_index > max) {
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max = module->ctx_index;
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}
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}
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}
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/* prevent loading of additional modules */
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cycle->modules_used = 1;
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return max + 1;
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}
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ngx_int_t
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ngx_add_module(ngx_conf_t *cf, ngx_str_t *file, ngx_module_t *module,
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char **order)
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{
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void *rv;
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ngx_uint_t i, m, before;
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ngx_core_module_t *core_module;
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if (cf->cycle->modules_n >= ngx_max_module) {
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ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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"too many modules loaded");
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return NGX_ERROR;
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}
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if (module->version != nginx_version) {
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ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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"module \"%V\" version %ui instead of %ui",
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file, module->version, (ngx_uint_t) nginx_version);
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return NGX_ERROR;
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}
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if (ngx_strcmp(module->signature, NGX_MODULE_SIGNATURE) != 0) {
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ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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"module \"%V\" is not binary compatible",
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file);
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return NGX_ERROR;
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}
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for (m = 0; cf->cycle->modules[m]; m++) {
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if (ngx_strcmp(cf->cycle->modules[m]->name, module->name) == 0) {
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ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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"module \"%s\" is already loaded",
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module->name);
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return NGX_ERROR;
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}
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}
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/*
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* if the module wasn't previously loaded, assign an index
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*/
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if (module->index == NGX_MODULE_UNSET_INDEX) {
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module->index = ngx_module_index(cf->cycle);
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if (module->index >= ngx_max_module) {
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ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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"too many modules loaded");
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return NGX_ERROR;
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}
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}
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/*
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* put the module into the cycle->modules array
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*/
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before = cf->cycle->modules_n;
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if (order) {
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for (i = 0; order[i]; i++) {
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if (ngx_strcmp(order[i], module->name) == 0) {
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i++;
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break;
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}
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}
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for ( /* void */ ; order[i]; i++) {
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#if 0
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ngx_log_debug2(NGX_LOG_DEBUG_CORE, cf->log, 0,
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"module: %s before %s",
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module->name, order[i]);
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#endif
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for (m = 0; m < before; m++) {
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if (ngx_strcmp(cf->cycle->modules[m]->name, order[i]) == 0) {
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ngx_log_debug3(NGX_LOG_DEBUG_CORE, cf->log, 0,
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"module: %s before %s:%i",
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module->name, order[i], m);
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before = m;
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break;
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}
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}
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}
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}
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/* put the module before modules[before] */
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if (before != cf->cycle->modules_n) {
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ngx_memmove(&cf->cycle->modules[before + 1],
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&cf->cycle->modules[before],
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(cf->cycle->modules_n - before) * sizeof(ngx_module_t *));
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}
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cf->cycle->modules[before] = module;
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cf->cycle->modules_n++;
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if (module->type == NGX_CORE_MODULE) {
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/*
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* we are smart enough to initialize core modules;
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* other modules are expected to be loaded before
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* initialization - e.g., http modules must be loaded
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* before http{} block
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*/
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core_module = module->ctx;
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if (core_module->create_conf) {
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rv = core_module->create_conf(cf->cycle);
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if (rv == NULL) {
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return NGX_ERROR;
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}
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cf->cycle->conf_ctx[module->index] = rv;
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}
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}
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return NGX_OK;
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}
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static ngx_uint_t
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ngx_module_index(ngx_cycle_t *cycle)
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{
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ngx_uint_t i, index;
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ngx_module_t *module;
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index = 0;
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again:
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/* find an unused index */
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for (i = 0; cycle->modules[i]; i++) {
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module = cycle->modules[i];
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if (module->index == index) {
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index++;
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goto again;
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}
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}
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/* check previous cycle */
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if (cycle->old_cycle && cycle->old_cycle->modules) {
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for (i = 0; cycle->old_cycle->modules[i]; i++) {
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module = cycle->old_cycle->modules[i];
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if (module->index == index) {
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index++;
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goto again;
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}
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}
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}
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return index;
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}
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static ngx_uint_t
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ngx_module_ctx_index(ngx_cycle_t *cycle, ngx_uint_t type, ngx_uint_t index)
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{
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ngx_uint_t i;
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ngx_module_t *module;
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again:
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/* find an unused ctx_index */
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for (i = 0; cycle->modules[i]; i++) {
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module = cycle->modules[i];
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if (module->type != type) {
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continue;
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}
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if (module->ctx_index == index) {
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index++;
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goto again;
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}
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}
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/* check previous cycle */
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if (cycle->old_cycle && cycle->old_cycle->modules) {
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for (i = 0; cycle->old_cycle->modules[i]; i++) {
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module = cycle->old_cycle->modules[i];
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if (module->type != type) {
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continue;
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}
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if (module->ctx_index == index) {
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index++;
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goto again;
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}
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}
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}
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return index;
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}
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