fdboost

fdboost is a collection of utilities for FoundationDB enhancing the functionality of the FoundationDB node.js bindings.

Includes utilities for encoding tuples with strongly typed values and a high performance range key counting method (thanks to Christophe Chevalier @Doxsense).

This module is evolving speedily and further documentation and tests will be included over the coming days.

All contributions are welcome.

API activation

fdboost has 3 alternative methods of activation, each of which returns a functionally enhanced version of a typical fdb module.

Simple

var fdb = require('fdboost')();

Version

var fdb = require('fdboost')(300);

// or

var fdb = require('fdboost').apiVersion(300);

Injected

var fdb = require('fdb').apiVersion(300);
require('fdboost').use(fdb);

Throws an error if an fdb module is not passed to the use() function.

Enhancements

API activation surgically grafts a collection of new functions and namespaces onto carefully targetted facets of the fdb module prototype chain.

Encoding objects

fdb.encoding.encode(value, [prefix])

fdb.encoding.decode(buffer, [prefix])

Database objects

Database.countKeys(options, [callback])

Database.getLastKey(keyPrefix, [callback])

Transaction objects

Transaction.countKeys(options, [callback])

Transaction.getLastKey(keyPrefix, [callback])

RangeReader objects

A RangeReader object provides an elegant method of reading data using the node.js EventEmitter as an alternative to the LazyIterator model.

class RangeReader(options)

• options.begin (Buffer|fdb.KeySelector) First key in the reader range.
• [options.end=undefined] (Buffer|fdb.KeySelector) Last key in the reader range.
• [options.limit=undefined] (number) Only the first limit keys (and their values) in the range will be returned.
• [options.reverse=undefined] (boolean) Specified if the keys in the range will be returned in reverse order
• [options.streamingMode=undefined] (iterator|want_all|small|medium|large|serial|exact) fdb.streamingMode property that permits the API client to customize performance tradeoff by providing extra information about how the iterator will be used.
• [options.nonTransactional=false] (boolean) Reset transaction on expiry and start.
• [options.snapshot=false] (boolean) Defines whether range reads should be snapshot reads.

RangeReader.execute([tr], iteratorType)

• [tr=null] (object) Transaction.
• iteratorType (string) Value can be batch, each or array.

Events

data

continue

error

end

Tuple layer

fdb.tuple.packEncoded(arr, [prefix])

fdb.tuple.unpackEncoded(key, [prefix])

Todo

Polish comments

More elegant debug logging

Debug boundariestask class

Installation

npm install fdboost

License

(The MIT License)

Copyright (c) frisB.com <play@frisb.com> Copyright (c) FoundationDB, LLC

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