"Key not found in database" from db.get, when fetching keys that are known to exist about level

[pgleghorn]

Hi @vweevers , sure the createReadStream is pretty much a copy from the readme:

function fetchAll() {
  const db = level('leveldb')
  db.createReadStream()
    .on('data', function (data) {
      console.log(data.key, '=', data.value)
    })
    .on('error', function (err) {
      console.log('Oh my!', err)
    })
    .on('close', function () {
      console.log('Stream closed')
    })
    .on('end', function () {
      console.log('Stream ended')
    })
}

But I just figured out the problem, there are some non-printable characters in the keys. I used createReadStream to fetch everything and write the keys into files, so that I could hex dump them:

$ xxd key3
00000000: 5f66 696c 653a 2f2f 0001 6462 496e 6974  _file://..dbInit
00000010: 436f 6e74 6578 74                        Context

No idea what's up with these funky hidden chars, but now I succeed to fetch them via db.get using a suitable matching key:

  var funkyKey = "_file://\000\001dbInitContext"
  console.log(`fetching dbInitContext with a funky key: ${await db.get(funkyKey)}`);

n.b I thought I might need to use {keyEncoding: 'binary'} on the db.get options, but turns out it works regardless.

Thx
Phil

[vweevers]

For example using createReadStream

Can you share that code as well? So we can see the difference.