init_worker_by_lua_file流程

static ngx_command_t ngx_http_lua_cmds[] = {
    //...
    { ngx_string("init_worker_by_lua_file"),
      NGX_HTTP_MAIN_CONF|NGX_CONF_TAKE1,
      ngx_http_lua_init_worker_by_lua,
      NGX_HTTP_MAIN_CONF_OFFSET,
      0,
      (void *) ngx_http_lua_init_worker_by_file },
    //...
}


char *
ngx_http_lua_init_worker_by_lua(ngx_conf_t *cf, ngx_command_t *cmd,
    void *conf)
{
    u_char                      *name;
    ngx_str_t                   *value;
    ngx_http_lua_main_conf_t    *lmcf = conf;

    dd("enter");

    /*  must specify a content handler */
    if (cmd->post == NULL) {
        return NGX_CONF_ERROR;
    }

    if (lmcf->init_worker_handler) {
        return "is duplicate";
    }

    value = cf->args->elts;

    lmcf->init_worker_handler = (ngx_http_lua_main_conf_handler_pt) cmd->post;

    if (cmd->post == ngx_http_lua_init_worker_by_file) {
        name = ngx_http_lua_rebase_path(cf->pool, value[1].data,
                                        value[1].len);
        if (name == NULL) {
            return NGX_CONF_ERROR;
        }

        lmcf->init_worker_src.data = name;
        lmcf->init_worker_src.len = ngx_strlen(name);

    } else {
        lmcf->init_worker_src = value[1];
    }

    return NGX_CONF_OK;
}