LevelDB support in Dart

[Jon Brisbin]

I couldn't find anything extant to use LevelDB from Dart and a quick answer on StackOverflow confirmed my suspicions: there is no LevelDB support from Dart. That's odd considering they're both Google initiatives--but I can understand that priorities are somewhat different. IMO good LevelDB support would be a huge win for server-side Dart. I'm not a C++ programmer myself, so I wouldn't trust the code I would attempt to write to create an async port that uses LevelDB's C++ API. I'm sure I could muddle through but I'm just not sure I have the time or willpower. 

Since I can't find any other questions about LevelDB here in this group, I assume no one has yet discussed what form this integration should take and what such a Dart API would look like?

[Justin Fagnani]

On Thu, Sep 25, 2014 at 9:30 AM, Jon Brisbin <j...@jbrisbin.com> wrote:

I couldn't find anything extant to use LevelDB from Dart and a quick answer on StackOverflow confirmed my suspicions: there is no LevelDB support from Dart. That's odd considering they're both Google initiatives

It's not really that odd. They're a different team, and it's not like every team at Google rushes out and creates clients in Go and Dart immediately just because they're Google created languages. There's gradual uptake that happens inside Google, just like there is outside of it, so it takes time for someone to come around to needing something like this, especially since we're really just getting started with server-side Dart.

 

--but I can understand that priorities are somewhat different. IMO good LevelDB support would be a huge win for server-side Dart. I'm not a C++ programmer myself, so I wouldn't trust the code I would attempt to write to create an async port that uses LevelDB's C++ API. I'm sure I could muddle through but I'm just not sure I have the time or willpower. 

Is there a LevelDB group you could maybe get help from?

 

Since I can't find any other questions about LevelDB here in this group, I assume no one has yet discussed what form this integration should take and what such a Dart API would look like?

Not that I know of. I assume it'd look something like IndexedDB or the other database packages - the good ones have used Futures and Streams to make idiomatic APIs. I see that the LevelUP package for Node is synchronous, I'd probably suggest that a Dart API be asynchronous.

Cheers,

  Justin

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[Jon Brisbin]

On September 25, 2014 at 2:19:04 PM, 'Justin Fagnani' via Dart Misc (mi...@dartlang.org) wrote:

 

--but I can understand that priorities are somewhat different. IMO good LevelDB support would be a huge win for server-side Dart. I'm not a C++ programmer myself, so I wouldn't trust the code I would attempt to write to create an async port that uses LevelDB's C++ API. I'm sure I could muddle through but I'm just not sure I have the time or willpower. 

Is there a LevelDB group you could maybe get help from?

I’m not currently part of one but I’m sure there’s help to be had there…

 

Since I can't find any other questions about LevelDB here in this group, I assume no one has yet discussed what form this integration should take and what such a Dart API would look like?

Not that I know of. I assume it'd look something like IndexedDB or the other database packages - the good ones have used Futures and Streams to make idiomatic APIs. I see that the LevelUP package for Node is synchronous, I'd probably suggest that a Dart API be asynchronous.

I agree. I’m all about reactive, async patterns! :)

I’ve been looking into the async port API for Dart and it does look reasonably straightforward. The hard part is really going to be getting the C part correct since that’s a bit of an unknown to me.

Thanks!

Jon Brisbin

http://jbrisbin.com

@JonBrisbin | @mformonochrome

[George Moschovitis]

I couldn't find anything extant to use LevelDB from Dart

I could also find good uses for such a package, but I also have no time/willpower to write a native extension :(

[Daniel Morilha]

I've been playing with the bindings this weekend. There is still a lot to be done. Feel free to fork and contribute.

Thanks,

https://github.com/dmorilha/dart-leveldb

On Fri, Sep 26, 2014 at 5:39 AM, George Moschovitis <george.mo...@gmail.com> wrote:

I couldn't find anything extant to use LevelDB from Dart

I could also find good uses for such a packages, but I also have no time/willpower to write a native extension :(

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Daniel Morilha (dmor...@gmail.com)

[John Hewson]

dmorilha, looks like a good start. One thought: to be usable in a Dart web server the bindings will need to be asynchronous.

-- John

[Filipe Morgado]

Hey guys,

I would definitely consider such a library.

I have nothing helpful to add except for a suggestion.

Maybe use RocksDB instead?

It originally forked from LevelDB, improved a lot of stuff (way better concurrency, fast storage optimizations, etc) and is actively developed.

LevelDB seems pretty stall.

[Jon Brisbin]

RocksDB looks very intriguing!

I really wish I was a C++ programmer because I would love to dig into creating a Dart Stream-based API around this kind of high-performance K/V store. The RocksDB API actually does look easier to grok than LevelDB. It would be a good choice for an async and Stream-based package.

Thanks!

Jon Brisbin

http://jbrisbin.com

@JonBrisbin | @mformonochrome

[Adam Lofts]

I have written a LevelDB binding for the Dart VM. It is fully async and uses a Stream for iterating over key/value pairs in the database so you can use an await for loop.

The api is modelled on the Node.js bindings (LevelUP) which are mature so I don't expect huge changes.

The github link is here: https://github.com/adamlofts/leveldb_dart

I am unable to upload it to pub because I don't think pub supports dart native extensions.

Adam