Update multileveldown and level-party

[mattmorgis]

Hi,

I understand leveldown@v5 is the minimum version for Node.js 12 support.

Is it feasible to add Node.js 12 support to v4? I'd be happy to help out, but curious if it's a lost cause from the start.

I ask because I am working on updating level-party. I was able to get it to run on Node.js 10 and 11 by having it use a combination of levelup@1.x and leveldown@4.x (from leveldown@1.x.

It seems a refactor to leveldown@5x would require a refactor to abstract-leveldown@v6 and levelup@2.x+, which has some changes to encodings. If it's possible to add Node.js 12 support to v4, I could avoid the big reactor for now.

[vweevers]

I ask because I am working on updating level-party

What doesn't work when you combine level-party with leveldown@5?

I prefer fixing that over maintaining two release lines of leveldown.

[mattmorgis]

I prefer fixing that over maintaining two release lines of leveldown.

Totally understand. I am new to all of these level modules, and am trying to be a good open source citizen and update level-party as it failed to install when we upgraded to Node.js 10. I will take any guidance on how to upgrade it properly.

I have a fork of level-party here.

If you change this to "1.8.0" (levelup@1.x and levelup@2.x), it will work on Node.js 10 and 11, but won't install on Node.js 12.
https://github.com/MattMorgis/level-party/blob/node-10-support/package.json#L7

If you change it to "1.8.1" (levelup@1.x and leveldown@5.x), it installs on Node.js 12, but npm test will fail across all versions.
https://github.com/MattMorgis/level-party/blob/node-10-support/package.json#L7

The culprit is this test, specifically this line not getting called. I've gone down many rabbit holes trying to figure out why, but none have seemed to lead to the answer so far.
https://github.com/MattMorgis/level-party/blob/master/test/bytewise.js#L31

[vweevers]

I think the first step is to update https://github.com/mafintosh/multileveldown. Then we might need not even need API changes in level-party, which is just a thin wrapper around multileveldown.

[mattmorgis]

I've been down that rabbit hole. I have my own fork here, which was from this fork.

It seems when upgrading multileveldown to use levelup@2.x+, and bringing encoding-down into the mix breaks a lot there and which bubbles up into level-party

I can submit something that reproduces it, but the main tests that broke seemed to be almost there. It would want int 64, but instead would get the Buffer of that data or string "64".

[vweevers]

Yeah, I had a look at multileveldown just now. With a few tweaks, gets and puts and dels are working, read streams are not. I can take a closer look at the end of the week.

I'm afraid that rabbit hole (which I agree it is!) is the only proper way to fix this.

/cc @mafintosh Are you still (interested in) maintaining multileveldown? If not, we could consider moving it. But maybe not to Level at first, there's enough work here.

[vweevers]

OK, got all multileveldown tests to pass. But to make it work @ralphtheninja I'm afraid we're gonna have to revert this revert: Level/codec#23 (I will attempt to explain later)

[mattmorgis]

Interesting! Do you have a version pushed up to GitHub? I'd love to try it with level-party.

[vweevers]

https://github.com/vweevers/multileveldown/tree/wip-upgrade

[mattmorgis]

Tried it out here: https://github.com/MattMorgis/level-party/tree/node-10-support

Still getting the same error I mentioned above in level-party. It seems to get back the raw Buffer data back:

not ok 2 should be equivalent
  ---
    operator: deepEqual
    expected: [ 'a' ]
    actual:   <Buffer a0 70 61 00 00>
    at: ReadStream.<anonymous> (/level-party/test/bytewise.js:27:15)
  ...
not ok 3 should be equivalent
  ---
    operator: deepEqual
    expected: 22319
    actual:   { data: [ 50, 50, 51, 49, 57 ], type: 'Buffer' }
    at: ReadStream.<anonymous> (/level-party/test/bytewise.js:28:15)

[vweevers]

It might be helpful to copy (and adapt) that test to multileveldown. Then fix it there without level-party muddying the waters.

[binarykitchen]

Just scanned your conversations and salute your hard work to update both libraries. Really can't wait to upgrade these because Node.js v8 nears end-of-life this December, so ...

That said, what's the current state and what are we waiting for?