Expose a $request_time in msec to Nginx core

nxg_request_time_var.c

/* inspired from ngx_http_log_module.c:ngx_http_log_request_time() */
static ngx_int_t
ngx_http_request_time(ngx_http_request_t *r,
                      ngx_http_variable_value_t *v,
                      uintptr_t data) {
    ngx_time_t      *tp;
    ngx_msec_int_t   ms;

    tp = ngx_timeofday();

    ms = (ngx_msec_int_t)
             ((tp->sec - r->start_sec) * 1000 + (tp->msec - r->start_msec));
    ms = ngx_max(ms, 0);

    v->data = ngx_pnalloc(r->pool, NGX_TIME_T_LEN + 4);
    if (v->data == NULL) {
        return NGX_ERROR;
    }

    v->valid = 1;
    v->no_cacheable = 0;
    v->not_found = 0;

    v->len = ngx_snprintf(v->data, NGX_TIME_T_LEN + 4,
                          "%T.%03M", ms / 1000, ms % 1000) - v->data;

    return NGX_OK;
}

Hi, I was wondering how to install this in Nginx. Thanks!

you would probably need to make this part of a module, but if I were you I would explore if this data isn't already accessible via the Lua api found in OpenResty.