blob: 3e3c50683cd327164c10cf4dcacf0decdc0eec84 [file] [log] [blame]
/*
* Copyright (C) Igor Sysoev
* Copyright (C) Maxim Dounin
* Copyright (C) Nginx, Inc.
*/
#include <ngx_config.h>
#include <ngx_core.h>
#define NGX_MAX_DYNAMIC_MODULES 128
static ngx_uint_t ngx_module_index(ngx_cycle_t *cycle);
static ngx_uint_t ngx_module_ctx_index(ngx_cycle_t *cycle, ngx_uint_t type,
ngx_uint_t index);
ngx_uint_t ngx_max_module;
static ngx_uint_t ngx_modules_n;
ngx_int_t
ngx_preinit_modules(void)
{
ngx_uint_t i;
for (i = 0; ngx_modules[i]; i++) {
ngx_modules[i]->index = i;
ngx_modules[i]->name = ngx_module_names[i];
}
ngx_modules_n = i;
ngx_max_module = ngx_modules_n + NGX_MAX_DYNAMIC_MODULES;
return NGX_OK;
}
ngx_int_t
ngx_cycle_modules(ngx_cycle_t *cycle)
{
/*
* create a list of modules to be used for this cycle,
* copy static modules to it
*/
cycle->modules = ngx_pcalloc(cycle->pool, (ngx_max_module + 1)
* sizeof(ngx_module_t *));
if (cycle->modules == NULL) {
return NGX_ERROR;
}
ngx_memcpy(cycle->modules, ngx_modules,
ngx_modules_n * sizeof(ngx_module_t *));
cycle->modules_n = ngx_modules_n;
return NGX_OK;
}
ngx_int_t
ngx_init_modules(ngx_cycle_t *cycle)
{
ngx_uint_t i;
for (i = 0; cycle->modules[i]; i++) {
if (cycle->modules[i]->init_module) {
if (cycle->modules[i]->init_module(cycle) != NGX_OK) {
return NGX_ERROR;
}
}
}
return NGX_OK;
}
ngx_int_t
ngx_count_modules(ngx_cycle_t *cycle, ngx_uint_t type)
{
ngx_uint_t i, next, max;
ngx_module_t *module;
next = 0;
max = 0;
/* count appropriate modules, set up their indices */
for (i = 0; cycle->modules[i]; i++) {
module = cycle->modules[i];
if (module->type != type) {
continue;
}
if (module->ctx_index != NGX_MODULE_UNSET_INDEX) {
/* if ctx_index was assigned, preserve it */
if (module->ctx_index > max) {
max = module->ctx_index;
}
if (module->ctx_index == next) {
next++;
}
continue;
}
/* search for some free index */
module->ctx_index = ngx_module_ctx_index(cycle, type, next);
if (module->ctx_index > max) {
max = module->ctx_index;
}
next = module->ctx_index + 1;
}
/*
* make sure the number returned is big enough for previous
* cycle as well, else there will be problems if the number
* will be stored in a global variable (as it's used to be)
* and we'll have to roll back to the previous cycle
*/
if (cycle->old_cycle && cycle->old_cycle->modules) {
for (i = 0; cycle->old_cycle->modules[i]; i++) {
module = cycle->old_cycle->modules[i];
if (module->type != type) {
continue;
}
if (module->ctx_index > max) {
max = module->ctx_index;
}
}
}
/* prevent loading of additional modules */
cycle->modules_used = 1;
return max + 1;
}
ngx_int_t
ngx_add_module(ngx_conf_t *cf, ngx_str_t *file, ngx_module_t *module,
char **order)
{
void *rv;
ngx_uint_t i, m, before;
ngx_core_module_t *core_module;
if (cf->cycle->modules_n >= ngx_max_module) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"too many modules loaded");
return NGX_ERROR;
}
if (module->version != nginx_version) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"module \"%V\" version %ui instead of %ui",
file, module->version, (ngx_uint_t) nginx_version);
return NGX_ERROR;
}
if (ngx_strcmp(module->signature, NGX_MODULE_SIGNATURE) != 0) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"module \"%V\" is not binary compatible",
file);
return NGX_ERROR;
}
for (m = 0; cf->cycle->modules[m]; m++) {
if (ngx_strcmp(cf->cycle->modules[m]->name, module->name) == 0) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"module \"%s\" is already loaded",
module->name);
return NGX_ERROR;
}
}
/*
* if the module wasn't previously loaded, assign an index
*/
if (module->index == NGX_MODULE_UNSET_INDEX) {
module->index = ngx_module_index(cf->cycle);
if (module->index >= ngx_max_module) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"too many modules loaded");
return NGX_ERROR;
}
}
/*
* put the module into the cycle->modules array
*/
before = cf->cycle->modules_n;
if (order) {
for (i = 0; order[i]; i++) {
if (ngx_strcmp(order[i], module->name) == 0) {
i++;
break;
}
}
for ( /* void */ ; order[i]; i++) {
#if 0
ngx_log_debug2(NGX_LOG_DEBUG_CORE, cf->log, 0,
"module: %s before %s",
module->name, order[i]);
#endif
for (m = 0; m < before; m++) {
if (ngx_strcmp(cf->cycle->modules[m]->name, order[i]) == 0) {
ngx_log_debug3(NGX_LOG_DEBUG_CORE, cf->log, 0,
"module: %s before %s:%i",
module->name, order[i], m);
before = m;
break;
}
}
}
}
/* put the module before modules[before] */
if (before != cf->cycle->modules_n) {
ngx_memmove(&cf->cycle->modules[before + 1],
&cf->cycle->modules[before],
(cf->cycle->modules_n - before) * sizeof(ngx_module_t *));
}
cf->cycle->modules[before] = module;
cf->cycle->modules_n++;
if (module->type == NGX_CORE_MODULE) {
/*
* we are smart enough to initialize core modules;
* other modules are expected to be loaded before
* initialization - e.g., http modules must be loaded
* before http{} block
*/
core_module = module->ctx;
if (core_module->create_conf) {
rv = core_module->create_conf(cf->cycle);
if (rv == NULL) {
return NGX_ERROR;
}
cf->cycle->conf_ctx[module->index] = rv;
}
}
return NGX_OK;
}
static ngx_uint_t
ngx_module_index(ngx_cycle_t *cycle)
{
ngx_uint_t i, index;
ngx_module_t *module;
index = 0;
again:
/* find an unused index */
for (i = 0; cycle->modules[i]; i++) {
module = cycle->modules[i];
if (module->index == index) {
index++;
goto again;
}
}
/* check previous cycle */
if (cycle->old_cycle && cycle->old_cycle->modules) {
for (i = 0; cycle->old_cycle->modules[i]; i++) {
module = cycle->old_cycle->modules[i];
if (module->index == index) {
index++;
goto again;
}
}
}
return index;
}
static ngx_uint_t
ngx_module_ctx_index(ngx_cycle_t *cycle, ngx_uint_t type, ngx_uint_t index)
{
ngx_uint_t i;
ngx_module_t *module;
again:
/* find an unused ctx_index */
for (i = 0; cycle->modules[i]; i++) {
module = cycle->modules[i];
if (module->type != type) {
continue;
}
if (module->ctx_index == index) {
index++;
goto again;
}
}
/* check previous cycle */
if (cycle->old_cycle && cycle->old_cycle->modules) {
for (i = 0; cycle->old_cycle->modules[i]; i++) {
module = cycle->old_cycle->modules[i];
if (module->type != type) {
continue;
}
if (module->ctx_index == index) {
index++;
goto again;
}
}
}
return index;
}