storage

package
v0.95.4-pre Latest Latest
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 Go to latest Published: Jun 17, 2021 License: MIT Imports: 15 Imported by: 2

Documentation

Index

Constants

View Source 
const (
	// MaxStorageKeyLen is the maximum length of a key for storage items.
	MaxStorageKeyLen = 64
	// MaxStorageValueLen is the maximum length of a value for storage items.
	// It is set to be the maximum value for uint16.
	MaxStorageValueLen = 65535
)

Variables

View Source 
var Bucket = []byte("DB")

Bucket represents bucket used in boltdb to store all the data.

View Source 
var ErrKeyNotFound = errors.New("key not found")

ErrKeyNotFound is an error returned by Store implementations when a certain key is not found.

Functions

func AppendPrefix 

func AppendPrefix(k KeyPrefix, b []byte) []byte

AppendPrefix appends byteslice b to the given KeyPrefix. AppendKeyPrefix(SYSVersion, []byte{0x00, 0x01}).

func AppendPrefixInt 

func AppendPrefixInt(k KeyPrefix, n int) []byte

AppendPrefixInt append int n to the given KeyPrefix. 

AppendPrefixInt(SYSCurrentHeader, 10001)

Types

type BadgerDBBatch added in v0.75.0 

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

BadgerDBBatch is a wrapper around badger.WriteBatch, compatible with Batch interface.

func (*BadgerDBBatch) Delete added in v0.75.0 

func (b *BadgerDBBatch) Delete(key []byte)

Delete implements the Batch interface.

func (*BadgerDBBatch) Put added in v0.75.0 

func (b *BadgerDBBatch) Put(key, value []byte)

Put implements the Batch interface.

type BadgerDBOptions added in v0.75.0 

type BadgerDBOptions struct {
	Dir string `yaml:"BadgerDir"`
}

BadgerDBOptions configuration for BadgerDB.

type BadgerDBStore added in v0.75.0 

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

BadgerDBStore is the official storage implementation for storing and retrieving blockchain data.

func NewBadgerDBStore added in v0.75.0 

func NewBadgerDBStore(cfg BadgerDBOptions) (*BadgerDBStore, error)

NewBadgerDBStore returns a new BadgerDBStore object that will initialize the database found at the given path.

func (*BadgerDBStore) Batch added in v0.75.0 

func (b *BadgerDBStore) Batch() Batch

Batch implements the Batch interface and returns a badgerdb compatible Batch.

func (*BadgerDBStore) Close added in v0.75.0 

func (b *BadgerDBStore) Close() error

Close releases all db resources.

func (*BadgerDBStore) Delete added in v0.75.0 

func (b *BadgerDBStore) Delete(key []byte) error

Delete implements the Store interface.

func (*BadgerDBStore) Get added in v0.75.0 

func (b *BadgerDBStore) Get(key []byte) ([]byte, error)

Get implements the Store interface.

func (*BadgerDBStore) Put added in v0.75.0 

func (b *BadgerDBStore) Put(key, value []byte) error

Put implements the Store interface.

func (*BadgerDBStore) PutBatch added in v0.75.0 

func (b *BadgerDBStore) PutBatch(batch Batch) error

PutBatch implements the Store interface.

func (*BadgerDBStore) Seek added in v0.75.0 

func (b *BadgerDBStore) Seek(key []byte, f func(k, v []byte))

Seek implements the Store interface.

type Batch 

type Batch interface {
	Delete(k []byte)
	Put(k, v []byte)
}

Batch represents an abstraction on top of batch operations. Each Store implementation is responsible of casting a Batch to its appropriate type.

type BoltDBOptions 

type BoltDBOptions struct {
	FilePath string `yaml:"FilePath"`
}

BoltDBOptions configuration for boltdb.

type BoltDBStore 

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

BoltDBStore it is the storage implementation for storing and retrieving blockchain data.

func NewBoltDBStore 

func NewBoltDBStore(cfg BoltDBOptions) (*BoltDBStore, error)

NewBoltDBStore returns a new ready to use BoltDB storage with created bucket.

func (*BoltDBStore) Batch 

func (s *BoltDBStore) Batch() Batch

Batch implements the Batch interface and returns a boltdb compatible Batch.

func (*BoltDBStore) Close 

func (s *BoltDBStore) Close() error

Close releases all db resources.

func (*BoltDBStore) Delete 

func (s *BoltDBStore) Delete(key []byte) error

Delete implements the Store interface.

func (*BoltDBStore) Get 

func (s *BoltDBStore) Get(key []byte) (val []byte, err error)

Get implements the Store interface.

func (*BoltDBStore) Put 

func (s *BoltDBStore) Put(key, value []byte) error

Put implements the Store interface.

func (*BoltDBStore) PutBatch 

func (s *BoltDBStore) PutBatch(batch Batch) error

PutBatch implements the Store interface.

func (*BoltDBStore) Seek 

func (s *BoltDBStore) Seek(key []byte, f func(k, v []byte))

Seek implements the Store interface.

type DBConfiguration 

type DBConfiguration struct {
	Type            string          `yaml:"Type"`
	LevelDBOptions  LevelDBOptions  `yaml:"LevelDBOptions"`
	RedisDBOptions  RedisDBOptions  `yaml:"RedisDBOptions"`
	BoltDBOptions   BoltDBOptions   `yaml:"BoltDBOptions"`
	BadgerDBOptions BadgerDBOptions `yaml:"BadgerDBOptions"`
}

DBConfiguration describes configuration for DB. Supported: 'levelDB', 'redisDB', 'boltDB', 'badgerDB'.

type KeyPrefix 

type KeyPrefix uint8

KeyPrefix is a constant byte added as a prefix for each key stored. 

const (
	DataBlock        KeyPrefix = 0x01
	DataTransaction  KeyPrefix = 0x02
	DataMPT          KeyPrefix = 0x03
	STAccount        KeyPrefix = 0x40
	STNotification   KeyPrefix = 0x4d
	STContractID     KeyPrefix = 0x51
	STStorage        KeyPrefix = 0x70
	STNEP17Transfers KeyPrefix = 0x72
	STNEP17Balances  KeyPrefix = 0x73
	IXHeaderHashList KeyPrefix = 0x80
	SYSCurrentBlock  KeyPrefix = 0xc0
	SYSCurrentHeader KeyPrefix = 0xc1
	SYSVersion       KeyPrefix = 0xf0
)

KeyPrefix constants.

func (KeyPrefix) Bytes 

func (k KeyPrefix) Bytes() []byte

Bytes returns the bytes representation of KeyPrefix.

type KeyValue 

type KeyValue struct {
	Key   []byte
	Value []byte

	Exists bool
}

KeyValue represents key-value pair.

type LevelDBOptions 

type LevelDBOptions struct {
	DataDirectoryPath string `yaml:"DataDirectoryPath"`
}

LevelDBOptions configuration for LevelDB.

type LevelDBStore 

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

LevelDBStore is the official storage implementation for storing and retrieving blockchain data.

func NewLevelDBStore 

func NewLevelDBStore(cfg LevelDBOptions) (*LevelDBStore, error)

NewLevelDBStore returns a new LevelDBStore object that will initialize the database found at the given path.

func (*LevelDBStore) Batch 

func (s *LevelDBStore) Batch() Batch

Batch implements the Batch interface and returns a leveldb compatible Batch.

func (*LevelDBStore) Close 

func (s *LevelDBStore) Close() error

Close implements the Store interface.

func (*LevelDBStore) Delete 

func (s *LevelDBStore) Delete(key []byte) error

Delete implements the Store interface.

func (*LevelDBStore) Get 

func (s *LevelDBStore) Get(key []byte) ([]byte, error)

Get implements the Store interface.

func (*LevelDBStore) Put 

func (s *LevelDBStore) Put(key, value []byte) error

Put implements the Store interface.

func (*LevelDBStore) PutBatch 

func (s *LevelDBStore) PutBatch(batch Batch) error

PutBatch implements the Store interface.

func (*LevelDBStore) Seek 

func (s *LevelDBStore) Seek(key []byte, f func(k, v []byte))

Seek implements the Store interface.

type MemBatch 

type MemBatch struct {
	Put     []KeyValue
	Deleted []KeyValue
}

MemBatch represents a changeset to be persisted.

type MemCachedStore 

type MemCachedStore struct {
	MemoryStore
	// contains filtered or unexported fields
}

MemCachedStore is a wrapper around persistent store that caches all changes being made for them to be later flushed in one batch.

func NewMemCachedStore 

func NewMemCachedStore(lower Store) *MemCachedStore

NewMemCachedStore creates a new MemCachedStore object.

func (*MemCachedStore) Close 

func (s *MemCachedStore) Close() error

Close implements Store interface, clears up memory and closes the lower layer Store.

func (*MemCachedStore) Get 

func (s *MemCachedStore) Get(key []byte) ([]byte, error)

Get implements the Store interface.

func (*MemCachedStore) GetBatch 

func (s *MemCachedStore) GetBatch() *MemBatch

GetBatch returns currently accumulated changeset.

func (*MemCachedStore) Persist 

func (s *MemCachedStore) Persist() (int, error)

Persist flushes all the MemoryStore contents into the (supposedly) persistent store ps.

func (*MemCachedStore) Seek 

func (s *MemCachedStore) Seek(key []byte, f func(k, v []byte))

Seek implements the Store interface.

type MemoryBatch 

type MemoryBatch struct {
	MemoryStore
}

MemoryBatch is an in-memory batch compatible with MemoryStore.

func (*MemoryBatch) Delete 

func (b *MemoryBatch) Delete(k []byte)

Delete implements Batch interface.

func (*MemoryBatch) Put 

func (b *MemoryBatch) Put(k, v []byte)

Put implements the Batch interface.

type MemoryStore 

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

MemoryStore is an in-memory implementation of a Store, mainly used for testing. Do not use MemoryStore in production.

func NewMemoryStore 

func NewMemoryStore() *MemoryStore

NewMemoryStore creates a new MemoryStore object.

func (*MemoryStore) Batch 

func (s *MemoryStore) Batch() Batch

Batch implements the Batch interface and returns a compatible Batch.

func (*MemoryStore) Close 

func (s *MemoryStore) Close() error

Close implements Store interface and clears up memory. Never returns an error.

func (*MemoryStore) Delete 

func (s *MemoryStore) Delete(key []byte) error

Delete implements Store interface. Never returns an error.

func (*MemoryStore) Get 

func (s *MemoryStore) Get(key []byte) ([]byte, error)

Get implements the Store interface.

func (*MemoryStore) Put 

func (s *MemoryStore) Put(key, value []byte) error

Put implements the Store interface. Never returns an error.

func (*MemoryStore) PutBatch 

func (s *MemoryStore) PutBatch(batch Batch) error

PutBatch implements the Store interface. Never returns an error.

func (*MemoryStore) Seek 

func (s *MemoryStore) Seek(key []byte, f func(k, v []byte))

Seek implements the Store interface.

func (*MemoryStore) SeekAll added in v0.92.0 

func (s *MemoryStore) SeekAll(key []byte, f func(k, v []byte))

SeekAll is like seek but also iterates over deleted items.

type RedisDBOptions 

type RedisDBOptions struct {
	Addr     string `yaml:"Addr"`
	Password string `yaml:"Password"`
	DB       int    `yaml:"DB"`
}

RedisDBOptions configuration for RedisDB.

type RedisStore 

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

RedisStore holds the client and maybe later some more metadata.

func NewRedisStore 

func NewRedisStore(cfg RedisDBOptions) (*RedisStore, error)

NewRedisStore returns an new initialized - ready to use RedisStore object.

func (*RedisStore) Batch 

func (s *RedisStore) Batch() Batch

Batch implements the Store interface.

func (*RedisStore) Close 

func (s *RedisStore) Close() error

Close implements the Store interface.

func (*RedisStore) Delete 

func (s *RedisStore) Delete(k []byte) error

Delete implements the Store interface.

func (*RedisStore) Get 

func (s *RedisStore) Get(k []byte) ([]byte, error)

Get implements the Store interface.

func (*RedisStore) Put 

func (s *RedisStore) Put(k, v []byte) error

Put implements the Store interface.

func (*RedisStore) PutBatch 

func (s *RedisStore) PutBatch(b Batch) error

PutBatch implements the Store interface.

func (*RedisStore) Seek 

func (s *RedisStore) Seek(k []byte, f func(k, v []byte))

Seek implements the Store interface.

type Store 

type Store interface {
	Batch() Batch
	Delete(k []byte) error
	Get([]byte) ([]byte, error)
	Put(k, v []byte) error
	PutBatch(Batch) error
	// Seek can guarantee that provided key (k) and value (v) are the only valid until the next call to f.
	// Key and value slices should not be modified.
	Seek(k []byte, f func(k, v []byte))
	Close() error
}

Store is anything that can persist and retrieve the blockchain. information.

func NewStore 

func NewStore(cfg DBConfiguration) (Store, error)

NewStore creates storage with preselected in configuration database type.

Source Files

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