alternative api to avoid versionstamp deadlock

[Pyrolistical]

This is the current versionstamp API, which can lead to deadlock if one awaits the tn.getVersionstamp().promise inside doTn

const p = await db.doTn(async tn => {
  tn.set('key', 'val')
  return tn.getVersionstamp()
})

const versionstamp = await p.promise // 10 byte buffer

Could we avoid this problem all together by another api like doTnWithVersionstamp

const [value, versionstamp] = await db.doTnWithVersionstamp(async (tn, versionstamp) => {
  // versionstamp is just a placeholder, notice how much easier it is to use in a tuple key
  tn.set(['key', versionstamp, 'suffix'], 'val')
  return tn.get(['key', versionstamp, 'suffix'])
})

// value === 'val'
// versionstamp === 10 byte buffer

In this new api await versionstamp does nothing inside doTnWithVersionstamp

[josephg]

Out of curiosity, is this a problem you're running into or just a neat idea?

[Pyrolistical]

Just a neat idea. I'm an API guy so I saw this opportunity.