kv is simple key/value storage based on syndtr/goleveldb library.

Summary

• Written on tiny Go
• Go library
• Require Go version >= 1.15
• Simple API
• Persistent key/value storage
• Use LSM-tree engine
• Has mock object for tests

Install

go get github.com/wmentor/kv

Usage

package main

import (
  "fmt"

  "github.com/wmentor/kv"
)

func main() {
  db, err := kv.Open("path=./base")
	if err != nil {
		panic(err)
	}
	defer db.Close()

  db.Set([]byte("1"), []byte("11"))
  db.Set([]byte("10"), []byte("1100"))
  db.Set([]byte("11"), []byte("1111"))
  db.Set([]byte("12"), []byte("1122"))
  db.Set([]byte("3"), []byte("33"))
  db.Set([]byte("4"), []byte("44"))
  db.Set([]byte("5"), []byte("55"))
  db.Set([]byte("6"), []byte("66"))

  fmt.Println(string(db.Get([]byte("5")))) // 55

  db.Get([]byte("7")) // nil

  fmt.Println(db.Has([]byte("5"))) // true
  db.Set([]byte("5"), nil) // remove key []byte("5")
  fmt.Println(db.Has([]byte("5"))) // false

  db.Prefix([]byte("1"), func(k, v []byte) bool {
    fmt.Println(string(k) + " " + string(v))
    return true
  })
  /* print:
  1 11
  10 1100
  11 1111
  12 1122
  */

  db.Range([]byte("12"), []byte("4"), func(k, v []byte) bool {
    fmt.Println(string(k) + " " + string(v))
    return true
  })
  /* print:
  12 1122
  2 22
  3 33
  */
}

Work with global context:

package main

import (
  "github.com/wmentor/kv"
)

func main() {
  _, err := kv.Open("path=./base global=1")
	if err != nil {
		panic(err)
	}
	defer kv.Close()

  kv.Set([]byte("1"), []byte("11"))
  kv.Set([]byte("10"), []byte("1100"))
  ...
}

Work with test context:

package main

import (
  "github.com/wmentor/kv"
)

func main() {
  _, err := kv.Open("test=1 global=1")
	if err != nil {
		panic(err)
	}
	defer kv.Close()

  kv.Set([]byte("1"), []byte("11"))
  kv.Set([]byte("10"), []byte("1100"))
  ...
}