Files
postgrest/src/PostgREST/TimeIt.hs
T
steve-chavez 013f078bc4 fix: inaccurate Server-Timing durations
The transaction duration was notably off, doing:

```
curl localhost:3000/rpc/sleep?seconds=5 -i
```

Shows `46.1` for the `transaction;dur`, with this fix we obtain
`5007.3`.

Fixes https://github.com/PostgREST/postgrest/issues/4522

This also fixes inaccurate "schema cache queried" logs,
see https://github.com/PostgREST/postgrest/issues/4551.
2025-12-18 17:35:18 -05:00

21 lines
614 B
Haskell

module PostgREST.TimeIt
( timeItT
) where
import GHC.Clock
import Protolude
{-
- The signature is the same as https://hackage.haskell.org/package/timeit-2.0/docs/src/System-TimeIt.html#timeIt,
- we vendor this functionality because it gave errors as shown on https://github.com/PostgREST/postgrest/issues/4522 plus
- the function is small enough. This vendored function is different in that the result is in milliseconds.
-}
timeItT :: MonadIO m => m a -> m (Double, a)
timeItT p = do
s <- liftIO getMonotonicTime
x <- p
e <- liftIO getMonotonicTime
let time = (e - s) * 1000
return (time, x)