Using `vars` multiple times in `access_log.format` does not work correctly with njs about unit

[tippexs]

Hi @valtzu Thanks for reaching out! This looks indeed not correct and I was able to reproduce the issue with the latest version of our Docker-Image and the format mentioned above.

We will have a look on this and share our progress here! Thanks again for reaching out!

[valtzu]

Actually this behavior seems to be random – sometimes it works, sometimes it doesn't 🤔

unit-1  | {"bodyLength":"82733","status":"82733"}
unit-1  | {"bodyLength":"82735","status":"82735"}
unit-1  | {"bodyLength":"82735","status":"200"}
unit-1  | {"bodyLength":"82735","status":"82735"}
unit-1  | {"bodyLength":"82735","status":"200"}
unit-1  | {"bodyLength":"82736","status":"200"}
unit-1  | {"bodyLength":"82734","status":"200"}
unit-1  | {"bodyLength":"82736","status":"200"}
unit-1  | {"bodyLength":"82736","status":"200"}
unit-1  | {"bodyLength":"82736","status":"200"}
unit-1  | {"bodyLength":"82736","status":"200"}
unit-1  | {"bodyLength":"82736","status":"200"}

[hongzhidao]

Hi @valtzu,
Thanks for the reporting. Will fix it soon with the patch.

diff --git a/src/nxt_var.c b/src/nxt_var.c
index 2600371b..57110f66 100644
--- a/src/nxt_var.c
+++ b/src/nxt_var.c
@@ -147,7 +147,7 @@ nxt_var_ref_get(nxt_tstr_state_t *state, nxt_str_t *name, nxt_mp_t *mp)

     if (decl != NULL) {
         ref->handler = decl->handler;
-        ref->cacheable = decl->cacheable;
+        ref->cacheable = (mp == state->pool) ? decl->cacheable : 0;

         goto done;
     }