location 块解析 -- ngx_http_core_location
// static char *
// ngx_http_core_location(ngx_conf_t *cf, ngx_command_t *cmd, void *dummy)
// location 块配置解析 {{{
static char *
ngx_http_core_location(ngx_conf_t *cf, ngx_command_t *cmd, void *dummy)
{
char *rv;
u_char *mod;
size_t len;
ngx_str_t *value, *name;
ngx_uint_t i;
ngx_conf_t save;
ngx_http_module_t *module;
ngx_http_conf_ctx_t *ctx, *pctx;
ngx_http_core_loc_conf_t *clcf, *pclcf;
ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_conf_ctx_t));
if (ctx == NULL) {
return NGX_CONF_ERROR;
}
pctx = cf->ctx;
ctx->main_conf = pctx->main_conf;
ctx->srv_conf = pctx->srv_conf;
ctx->loc_conf = ngx_pcalloc(cf->pool, sizeof(void *) * ngx_http_max_module);
if (ctx->loc_conf == NULL) {
return NGX_CONF_ERROR;
}
for (i = 0; ngx_modules[i]; i++) {
if (ngx_modules[i]->type != NGX_HTTP_MODULE) {
continue;
}
module = ngx_modules[i]->ctx;
if (module->create_loc_conf) {
ctx->loc_conf[ngx_modules[i]->ctx_index] =
module->create_loc_conf(cf);
if (ctx->loc_conf[ngx_modules[i]->ctx_index] == NULL) {
return NGX_CONF_ERROR;
}
}
}
clcf = ctx->loc_conf[ngx_http_core_module.ctx_index];
clcf->loc_conf = ctx->loc_conf;
value = cf->args->elts;
if (cf->args->nelts == 3) {
len = value[1].len;
mod = value[1].data;
name = &value[2];
if (len == 1 && mod[0] == '=') {
clcf->name = *name;
clcf->exact_match = 1;
} else if (len == 2 && mod[0] == '^' && mod[1] == '~') {
clcf->name = *name;
clcf->noregex = 1;
} else if (len == 1 && mod[0] == '~') {
if (ngx_http_core_regex_location(cf, clcf, name, 0) != NGX_OK) {
return NGX_CONF_ERROR;
}
} else if (len == 2 && mod[0] == '~' && mod[1] == '*') {
if (ngx_http_core_regex_location(cf, clcf, name, 1) != NGX_OK) {
return NGX_CONF_ERROR;
}
} else {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid location modifier "%V"", &value[1]);
return NGX_CONF_ERROR;
}
} else {
name = &value[1];
if (name->data[0] == '=') {
clcf->name.len = name->len - 1;
clcf->name.data = name->data + 1;
clcf->exact_match = 1;
} else if (name->data[0] == '^' && name->data[1] == '~') {
clcf->name.len = name->len - 2;
clcf->name.data = name->data + 2;
clcf->noregex = 1;
} else if (name->data[0] == '~') {
name->len--;
name->data++;
if (name->data[0] == '*') {
name->len--;
name->data++;
if (ngx_http_core_regex_location(cf, clcf, name, 1) != NGX_OK) {
return NGX_CONF_ERROR;
}
} else {
if (ngx_http_core_regex_location(cf, clcf, name, 0) != NGX_OK) {
return NGX_CONF_ERROR;
}
}
} else {
clcf->name = *name;
if (name->data[0] == '@') {
clcf->named = 1;
}
}
}
pclcf = pctx->loc_conf[ngx_http_core_module.ctx_index];
if (pclcf->name.len) {
/* nested location */
#if 0
clcf->prev_location = pclcf;
#endif
if (pclcf->exact_match) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"location "%V" cannot be inside "
"the exact location "%V"",
&clcf->name, &pclcf->name);
return NGX_CONF_ERROR;
}
if (pclcf->named) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"location "%V" cannot be inside "
"the named location "%V"",
&clcf->name, &pclcf->name);
return NGX_CONF_ERROR;
}
if (clcf->named) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"named location "%V" can be "
"on the server level only",
&clcf->name);
return NGX_CONF_ERROR;
}
len = pclcf->name.len;
#if (NGX_PCRE)
if (clcf->regex == NULL
&& ngx_filename_cmp(clcf->name.data, pclcf->name.data, len) != 0)
#else
if (ngx_filename_cmp(clcf->name.data, pclcf->name.data, len) != 0)
#endif
{
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"location "%V" is outside location "%V"",
&clcf->name, &pclcf->name);
return NGX_CONF_ERROR;
}
}
// 将 location 配置加入到 locations 配置链表中
if (ngx_http_add_location(cf, &pclcf->locations, clcf) != NGX_OK) {
return NGX_CONF_ERROR;
}
save = *cf;
cf->ctx = ctx;
cf->cmd_type = NGX_HTTP_LOC_CONF;
rv = ngx_conf_parse(cf, NULL);
*cf = save;
return rv;
} // }}}
