kv

A minimalist key-value store for simple use cases.

installation

go get github.com/sdeoras/kv

usage

This package defines a minimalist key-value interface and provides following implementations:

• boltdb
• in-memory database
• Google cloud data-store

keys

Keys can be simple strings or be written in a filepath format, e.g. a/b/c/myKey. Keys are parsed and appropriate nested tree structure is constructed for whichever backend is being used.

Furthermore, a tree can be deleted simply by entering partial key (e.g. a/b), that is a common prefix to other keys in that tree.

Leading / is ignored, i.e., /a/b/c/myKey is the same as a/b/c/myKey.

using boltdb database as backend

To create an instance of kv using boltdb as backend you can use the NewBoltKv function as follows. A namespace is simply a partition inside the database file.

import "github.com/sdeoras/kv"

func main() {
	kvdb, closeKv, err := kv.NewBoltKv(dbFileName, nameSpace)
	// handle err
	defer closeKv()
	
	if err := kvdb.Set(key, val); err != nil {
		// handle err
	}
	
	if val, err := kvdb.Get(key); err != nil {
		// handle err
	}
}

using in-memory database backend

To create an instance of KV using in-memory backend you can use NewMemKv function as follows:

import "github.com/sdeoras/kv"

func main() {
	kvdb, err := kv.NewMemKv()
	// handle err
}

using google cloud data-store backend

To create an instance of KV using google cloud data-store as backend you can use NewDataStoreKv function as follows:

import "github.com/sdeoras/kv"

func main() {
	kvdb, closeKv, err := kv.NewDataStoreKv(context.Background(), projectID, nameSpace)
	// handle err
	defer closeKv()
}

nested keys

key can be represented in the filepath format. For instance /a/b/c/myKey1 and /a/b/c/myKey2 are part of the same bucket /a/b/c and both be deleted by deleting the key /a/b/c

enumerate keys

If following keys are present in the db:

• /a/b/c/key1
• /a/b/c/key2

then enumerating using /, or /a or /a/b or /a/b/c would result in the following list as output:

• /a/b/c/key1
• /a/b/c/key2