Doesn't pass the PouchDB test suite

[nolanlawson]

Steps to repro:

hub clone pouchdb/pouchdb
cd pouchdb
npm install medeadown
LEVEL_ADAPTER=medeadown npm run test-node

Fails on the very first test with Uncaught AssertionError: expected {} to not exist. My hunch is that this is due to MedeaDOWN not exporting a LevelDOWN-compatible API in the same way that most *down adapters do, but I haven't investigated yet. This issue is just a heads-up in case you're curious and want to investigate. 😃

For more info about how to set up your project to run the PouchDB test suite (e.g. in Travis) and how to debug, check out this guide. *down adapters that are known to pass the test include LevelDOWN, MemDOWN, localstorage-down, level-js, riakdown, and redisdown.

[Ivshti]

Can you please post the full error log? I tried to setup the test quickly but it turns out I have to set up CouchDB too, can't do that now.

It's probably something trivial.

[nolanlawson]

Sorry, forgot that detail! You can also run a PouchDB Server backed by medeadown instead, but often it's easier to use CouchDB for debugging.

And you're right; the fix is easy. It looks like medeadown doesn't create a new database if the file isn't found?

"OpenError: _pouch_testdb: No such file or directory
    at LevelUP.open (/Users/nolan/workspace/node-levelup/lib/levelup.js:118:34)
    at MedeaDOWN._open (/Users/nolan/workspace/pouchdb/node_modules/medeadown/medeadown.js:28:14)
    at open (/Users/nolan/workspace/pouchdb/node_modules/medeadown/node_modules/leveldown-open/leveldown-open.js:15:18)
    at Object.cb [as oncomplete] (fs.js:169:19)"

[Ivshti]

Yes. I also met this issue once, I think it's a matter of mkdir vs mkdirp, but I solved it in my app instead of in Medea. It does make sense, Medea should not be expected to auto-create the directory the data should reside in. Unless of course LevelDB does that.

[nolanlawson]

LevelDB does. :) In fact, the PouchDB test suite passes against LevelDOWN, MemDOWN, level.js, localstorage-down, riakdown, and redisdown. So medeadown would be joining the crowd. :D

[Ivshti]

Well from these only LevelDOWN uses the FS directly. But yes, I agree, a mkdirp should get in there.

Update: it's weird though, just looked into Medea and it does mkdirp the directory. So no idea what goes wrong. Maybe medeadown does not go through medea's open procedure.

Update 2: looking at MedeaDOWN.prototype._open, it first calls leveldown-open and then medea's open which creates the dir (as expected). The error is emitted in leveldown-open. So the problem is not in medea, it's in medeadown.
leveldown-open would create the directory if "createIfMissing" is set. I don't know why leveldown-open is needed in the first place though.
@kevinswiber ?