leveldb

Documentation

Overview

Package leveldb contains an implementation of the `gokv.Store` interface for LevelDB.

Index

• Variables
• type Options
• type Store
  • func NewStore(options Options) (Store, error)
  • func (s Store) Close() error
  • func (s Store) Delete(k string) error
  • func (s Store) Get(k string, v interface{}) (found bool, err error)
  • func (s Store) Set(k string, v interface{}) error

Variables

var DefaultOptions = Options{
	Path:  "leveldb",
	Codec: encoding.JSON,
}

DefaultOptions is an Options object with default values. Path: "leveldb", WriteSync: false, Codec: encoding.JSON

Types

type Options

type Options struct {
	// Path of the DB files.
	// Optional ("leveldb" by default).
	Path string
	// Flag to enable immediate file synchronization on writes.
	// If enabled, writes take longer, but no writes are lost when the system crashes.
	// If disabled, writes go to a cache first and are persisted via snapshots automatically.
	// Set() and Delete() are both writes.
	// Optional (false by default).
	WriteSync bool
	// Encoding format.
	// Optional (encoding.JSON by default).
	Codec encoding.Codec
}

Options are the options for the LevelDB store.

type Store

type Store struct {
	// contains filtered or unexported fields
}

Store is a gokv.Store implementation for LevelDB.

func NewStore

func NewStore(options Options) (Store, error)

NewStore creates a new LevelDB store.

You must call the Close() method on the store when you're done working with it.

func (Store) Close

func (s Store) Close() error

Close closes the store. It must be called to releases any outstanding snapshots, abort any in-flight compactions and discard open transactions.

func (Store) Delete

func (s Store) Delete(k string) error

Delete deletes the stored value for the given key. Deleting a non-existing key-value pair does NOT lead to an error. The key must not be "".

func (Store) Get

func (s Store) Get(k string, v interface{}) (found bool, err error)

Get retrieves the stored value for the given key. You need to pass a pointer to the value, so in case of a struct the automatic unmarshalling can populate the fields of the object that v points to with the values of the retrieved object's values. If no value is found it returns (false, nil). The key must not be "" and the pointer must not be nil.

func (Store) Set

func (s Store) Set(k string, v interface{}) error

Set stores the given value for the given key. Values are automatically marshalled to JSON or gob (depending on the configuration). The key must not be "" and the value must not be nil.