Get a range in one go

[kesla]

Working with #96 got me thinking that we might have the opportunity here to add the functionality to get a range in one go.

The proposed API would then look something like this:

// where opts can take the same options as #iterator can
leveldown.getRange(opts, function (err, range) {
})

I find myself wanting to read a full range from time to time, so I end up reading everything from a stream and buffer it up, but with #96 in place perhaps that wouldn't need to be neccessary.

[rvagg]

See also #13 & #9 (related)

As I've said there, I'm fine with this kind of thing. I don't think it'll be exposed through LevelUP but I'd like to get people used to using storage-layer specific functionality where it makes sense and where they're wedded to a specific storage-layer: db.db.getRande(). There's also lots of scope for addons that provide this kind of functionality to be feature-testing the LevelDOWN layer to see if it supports what they want and providing a polyfill if it doesn't!

[juliangruber]

You could write level-get-range which checks for this.db.db.getRange and falls back to this.db.createReadStream

[kesla]

@juliangruber Great suggestion, that's how I'll implement it. Thanks for the suggestion!

[kesla]

@juliangruber https://www.npmjs.org/package/level-get-range

[juliangruber]

nice!

[ralphtheninja]

Kesla is rocking! :)