package pebble

import "github.com/ethereum/go-ethereum/ethdb/pebble"

Package pebble implements the key-value database layer based on pebble.

Index ¶

• type Database
• func New(file string, cache int, handles int, namespace string, readonly bool, ephemeral bool) (*Database, error)
• func (d *Database) Close() error
• func (d *Database) Compact(start []byte, limit []byte) error
• func (d *Database) Delete(key []byte) error
• func (d *Database) DeleteRange(start, end []byte) error
• func (d *Database) Get(key []byte) ([]byte, error)
• func (d *Database) Has(key []byte) (bool, error)
• func (d *Database) NewBatch() ethdb.Batch
• func (d *Database) NewBatchWithSize(size int) ethdb.Batch
• func (d *Database) NewIterator(prefix []byte, start []byte) ethdb.Iterator
• func (d *Database) Path() string
• func (d *Database) Put(key []byte, value []byte) error
• func (d *Database) Stat() (string, error)

Types ¶

type Database ¶

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

Database is a persistent key-value store based on the pebble storage engine. Apart from basic data storage functionality it also supports batch writes and iterating over the keyspace in binary-alphabetical order.

func New ¶

func New(file string, cache int, handles int, namespace string, readonly bool, ephemeral bool) (*Database, error)

New returns a wrapped pebble DB object. The namespace is the prefix that the metrics reporting should use for surfacing internal stats.

func (*Database) Close ¶

func (d *Database) Close() error

Close stops the metrics collection, flushes any pending data to disk and closes all io accesses to the underlying key-value store.

func (*Database) Compact ¶

func (d *Database) Compact(start []byte, limit []byte) error

Compact flattens the underlying data store for the given key range. In essence, deleted and overwritten versions are discarded, and the data is rearranged to reduce the cost of operations needed to access them.

A nil start is treated as a key before all keys in the data store; a nil limit is treated as a key after all keys in the data store. If both is nil then it will compact entire data store.

func (*Database) Delete ¶

func (d *Database) Delete(key []byte) error

Delete removes the key from the key-value store.

func (*Database) DeleteRange ¶

func (d *Database) DeleteRange(start, end []byte) error

DeleteRange deletes all of the keys (and values) in the range [start,end) (inclusive on start, exclusive on end).

func (*Database) Get ¶

func (d *Database) Get(key []byte) ([]byte, error)

Get retrieves the given key if it's present in the key-value store.

func (*Database) Has ¶

func (d *Database) Has(key []byte) (bool, error)

Has retrieves if a key is present in the key-value store.

func (*Database) NewBatch ¶

func (d *Database) NewBatch() ethdb.Batch

NewBatch creates a write-only key-value store that buffers changes to its host database until a final write is called.

func (*Database) NewBatchWithSize ¶

func (d *Database) NewBatchWithSize(size int) ethdb.Batch

NewBatchWithSize creates a write-only database batch with pre-allocated buffer.

func (*Database) NewIterator ¶

func (d *Database) NewIterator(prefix []byte, start []byte) ethdb.Iterator

NewIterator creates a binary-alphabetical iterator over a subset of database content with a particular key prefix, starting at a particular initial key (or after, if it does not exist).

func (*Database) Path ¶

func (d *Database) Path() string

Path returns the path to the database directory.

func (*Database) Put ¶

func (d *Database) Put(key []byte, value []byte) error

Put inserts the given value into the key-value store.

func (*Database) Stat ¶

func (d *Database) Stat() (string, error)

Stat returns the internal metrics of Pebble in a text format. It's a developer method to read everything there is to read, independent of Pebble version.

Source Files ¶

pebble.go