WIP: initial pure js impl for IBM i AIX variant

[ThePrez]

Creating as draft because the necessary db2util command has not yet been officially delivered by IBM. Hoping to address concerns in issues #5/#10.

The exception cases result in a UnhandledPromiseRejectionWarning but that seems in line with other implementations.

Review is welcome and appreciated

[ThePrez]

@patrickhrastnik , please review. Thanks!

[ThePrez]

Sorry, this is still a WIP for reason initially stated. This was my first time trying GitHub's new "Draft PR" function, and apparently saying it's "ready for review" makes it no longer a draft. Sorry about that!

[silverwind]

This is much better. So I take it db2util is not available on other AIX variants, only IBM i? Is the reason it's not in PATH because it's so new?

[patrickhrastnik]

Changes approved, works as expected on our IBM i
@ThePrez sent me a compiled version of db2util, which I deployed to our system. With that package, this code works fine.
Although, it should work fine with command db2util instead of the full path - I tested it in the shell, and since /QOpenSys/pkgs/bin is in PATH (by default?), it finds the command.

bash-4.4$ which db2util
/QOpenSys/pkgs/bin/db2util

[ThePrez]

Correct. This only works for the IBM i variant and not for the mainline AIX.
Once this lands, we should keep the existing AIX issue open or (my preference) close it and open a new issue specifically for "mainline AIX"

db2util will be shipped in /QOpenSys/pkgs/bin which is not in the default PATH for IBM i. Add-on tools aren't delivered in the default PATH for various reasons. I suspect @patrickhrastnik's environment has been configured to pick up node and therefore db2util unqualified, but that's not a requirement. I think it's safest to fully-qualify.

[silverwind]

Merged and did a few minor tweaks in 4ac57d4. Would you mind giving latest master one more test before I release it?

[ThePrez]

Testing looks good to me. Thanks!