multilevel-http

Access a leveldb instance from multiple processes via HTTP.

A limitation of LevelDB is that only one process is allowed access to the underlying data. multilevel-http exports a LevelDB instance over http.

Installation

npm install multilevel-http

API

Server:

var multilevel = require('multilevel-http')
// db = levelup instance or path to db
var server = multilevel.server(db, options)
server.listen(5000)

Client:

var multilevel = require('multilevel-http')
var db = multilevel.client('http://localhost:5000/')
// now you have the complete levelUP api!
// ...except for events - for those consider multilevel and level-live-stream

CLI

$ sudo npm install -g multilevel-http
$ multilevel-http -p 5000 path/to.db

HTTP API

Params

Use get-params to pass options to LevelDB, like ?encoding=json

GET /meta

Get meta information about the DB.

// GET /meta
{
  "compression" : false,
  "cacheSize" : 8 * 1024 * 1024,
  "encoding" : 'utf8',
  "keyEncoding" : 'utf8',
  "valueEncoding" : 'utf8',
  "path" : path
}

GET /data/:key

Get the value stored at :key.

// GET /data/foo
bar

POST /data/:key

Store data at :key.

// POST /data/foo bar
"ok"

DEL /data/:key

Delete data stored at :key.

// DEL /data/foo
"ok"

PUT /data

Store many values batched.

/* PUT /data [
  { key : 'bar', value : 'baz' },
  { key : 'foo', value : 'bar' }
] */

POST /data

Do many operations batched.

/* PUT /data [
  { type : 'put', key : 'bar', value : 'baz' },
  { type : 'del', key : 'foo' }
] */

GET /approximateSize/:from..:to

Get an approximation of disk space used to store the data in the given range.

// GET /approximateSize/a..z
123

GET /data

Get all the data.

// GET /data/12
[
  { key : 'bar', value : 'baz' },
  { key : 'foo', value : 'bar' },
  /* ... */
]

GET /range/:from..:to

Get all data in the given range.

// GET /range/a..c
[ { key : 'bar', value : 'baz' } ]

GET /keys

Get all the keys.

// GET /keys
[ 'bar', 'foo' ]

GET /keys/:from..:to

Get all the keys in the given range.

// GET /keys/a..c
[ 'bar' ]

GET /values

Get all the values.

// GET /values
[ 'baz', 'bar' ]

GET /values/:from..:to

Get all the values in the given range.

// GET /values/a..c
[ 'baz' ]

Server API

// server
var multilevel = require('multilevel-http')('my.db')
multilevel.listen(3000)

multilevel.server(path|db, meta)

server#listen(port)

Start serving on the given port.

server#{db,meta}

The stored db and meta data exposed.

License

(MIT)

Copyright (c) 2013 Julian Gruber <[email protected]>

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.