storage

package
v1.8.16-1 Latest Latest
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 Go to latest Published: Oct 1, 2018 License: GPL-3.0 Imports: 34 Imported by: 0

Documentation

Overview

Copyright 2016 The go-ethereum Authors This file is part of the go-ethereum library.

The go-ethereum library is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

The go-ethereum library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

Index

Constants

View Source 
const (
	ErrInit = iota
	ErrNotFound
	ErrIO
	ErrUnauthorized
	ErrInvalidValue
	ErrDataOverflow
	ErrNothingToReturn
	ErrCorruptData
	ErrInvalidSignature
	ErrNotSynced
	ErrPeriodDepth
	ErrCnt
)
View Source 
const (
	DataChunk = 0
	TreeChunk = 1
)
View Source 
const (
	BMTHash     = "BMT"
	SHA3Hash    = "SHA3" // http://golang.org/pkg/hash/#Hash
	DefaultHash = BMTHash
)
View Source 
const AddressLength = 32
View Source 
const (
	ChunkProcessors = 8
)
View Source 
const MaxPO = 16

Variables

View Source 
var (
	ErrChunkNotFound    = errors.New("chunk not found")
	ErrFetching         = errors.New("chunk still fetching")
	ErrChunkInvalid     = errors.New("invalid chunk")
	ErrChunkForward     = errors.New("cannot forward")
	ErrChunkUnavailable = errors.New("chunk unavailable")
	ErrChunkTimeout     = errors.New("timeout")
)
View Source 
var (
	ErrDBClosed = errors.New("LDBStore closed")
)
View Source 
var ZeroAddr = Address(common.Hash{}.Bytes())

Functions

func BytesToU64 

func BytesToU64(data []byte) uint64

func GenerateRandomData added in v1.8.16 

func GenerateRandomData(l int) (r io.Reader, slice []byte)

func IsZeroAddr added in v1.8.12 

func IsZeroAddr(addr Address) bool

func NewChunk 

func NewChunk(addr Address, data []byte) *chunk

func NewHasherStore added in v1.8.12 

func NewHasherStore(store ChunkStore, hashFunc SwarmHasher, toEncrypt bool) *hasherStore

NewHasherStore creates a hasherStore object, which implements Putter and Getter interfaces. With the HasherStore you can put and get chunk data (which is just []byte) into a ChunkStore and the hasherStore will take core of encryption/decryption of data if necessary

func Proximity added in v1.8.12 

func Proximity(one, other []byte) (ret int)

func U64ToBytes 

func U64ToBytes(val uint64) []byte

Types

type Address added in v1.8.12 

type Address []byte

func PyramidAppend added in v1.8.12 

func PyramidAppend(ctx context.Context, addr Address, reader io.Reader, putter Putter, getter Getter) (Address, func(context.Context) error, error)

func PyramidSplit added in v1.8.12 

func PyramidSplit(ctx context.Context, reader io.Reader, putter Putter, getter Getter) (Address, func(context.Context) error, error)

When splitting, data is given as a SectionReader, and the key is a hashSize long byte slice (Address), the root hash of the entire content will fill this once processing finishes. New chunks to store are store using the putter which the caller provides.

func TreeSplit added in v1.8.12 

func TreeSplit(ctx context.Context, data io.Reader, size int64, putter Putter) (k Address, wait func(context.Context) error, err error)

When splitting, data is given as a SectionReader, and the key is a hashSize long byte slice (Key), the root hash of the entire content will fill this once processing finishes. New chunks to store are store using the putter which the caller provides.

func (Address) Hex added in v1.8.12 

func (a Address) Hex() string

func (Address) Log added in v1.8.12 

func (a Address) Log() string

func (Address) MarshalJSON added in v1.8.12 

func (a Address) MarshalJSON() (out []byte, err error)

func (Address) Size added in v1.8.12 

func (a Address) Size() uint

func (Address) String added in v1.8.12 

func (a Address) String() string

func (*Address) UnmarshalJSON added in v1.8.12 

func (a *Address) UnmarshalJSON(value []byte) error

type AddressCollection added in v1.8.12 

type AddressCollection []Address

func NewAddressCollection added in v1.8.12 

func NewAddressCollection(l int) AddressCollection

func (AddressCollection) Len added in v1.8.12 

func (c AddressCollection) Len() int

func (AddressCollection) Less added in v1.8.12 

func (c AddressCollection) Less(i, j int) bool

func (AddressCollection) Swap added in v1.8.12 

func (c AddressCollection) Swap(i, j int)

type Chunk 

type Chunk interface {
	Address() Address
	Payload() []byte
	SpanBytes() []byte
	Span() int64
	Data() []byte
}

Chunk interface implemented by context.Contexts and data chunks

func GenerateRandomChunk added in v1.8.12 

func GenerateRandomChunk(dataSize int64) Chunk

func GenerateRandomChunks added in v1.8.12 

func GenerateRandomChunks(dataSize int64, count int) (chunks []Chunk)

type ChunkData added in v1.8.12 

type ChunkData []byte

func (ChunkData) Data added in v1.8.12 

func (c ChunkData) Data() []byte

func (ChunkData) Size added in v1.8.12 

func (c ChunkData) Size() uint64

NOTE: this returns invalid data if chunk is encrypted

type ChunkStore 

type ChunkStore interface {
	Put(ctx context.Context, ch Chunk) (err error)
	Get(rctx context.Context, ref Address) (ch Chunk, err error)
	Close()
}

type ChunkValidator added in v1.8.12 

type ChunkValidator interface {
	Validate(addr Address, data []byte) bool
}

type ChunkerParams 

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

type ContentAddressValidator added in v1.8.12 

type ContentAddressValidator struct {
	Hasher SwarmHasher
}

Provides method for validation of content address in chunks Holds the corresponding hasher to create the address

func NewContentAddressValidator added in v1.8.12 

func NewContentAddressValidator(hasher SwarmHasher) *ContentAddressValidator

Constructor

func (*ContentAddressValidator) Validate added in v1.8.12 

func (v *ContentAddressValidator) Validate(addr Address, data []byte) bool

Validate that the given key is a valid content address for the given data

type FakeChunkStore added in v1.8.16 

type FakeChunkStore struct {
}

FakeChunkStore doesn't store anything, just implements the ChunkStore interface It can be used to inject into a hasherStore if you don't want to actually store data just do the hashing

func (*FakeChunkStore) Close added in v1.8.16 

func (f *FakeChunkStore) Close()

Close doesn't store anything it is just here to implement ChunkStore

func (*FakeChunkStore) Get added in v1.8.16 

func (f *FakeChunkStore) Get(_ context.Context, ref Address) (Chunk, error)

Gut doesn't store anything it is just here to implement ChunkStore

func (*FakeChunkStore) Put added in v1.8.16 

func (f *FakeChunkStore) Put(_ context.Context, ch Chunk) error

Put doesn't store anything it is just here to implement ChunkStore

type FileStore added in v1.8.12 

type FileStore struct {
	ChunkStore
	// contains filtered or unexported fields
}

func NewFileStore added in v1.8.12 

func NewFileStore(store ChunkStore, params *FileStoreParams) *FileStore

func NewLocalFileStore added in v1.8.12 

func NewLocalFileStore(datadir string, basekey []byte) (*FileStore, error)

for testing locally

func (*FileStore) HashSize added in v1.8.12 

func (f *FileStore) HashSize() int

func (*FileStore) Retrieve added in v1.8.12 

func (f *FileStore) Retrieve(ctx context.Context, addr Address) (reader *LazyChunkReader, isEncrypted bool)

Public API. Main entry point for document retrieval directly. Used by the FS-aware API and httpaccess Chunk retrieval blocks on netStore requests with a timeout so reader will report error if retrieval of chunks within requested range time out. It returns a reader with the chunk data and whether the content was encrypted

func (*FileStore) Store added in v1.8.12 

func (f *FileStore) Store(ctx context.Context, data io.Reader, size int64, toEncrypt bool) (addr Address, wait func(context.Context) error, err error)

Public API. Main entry point for document storage directly. Used by the FS-aware API and httpaccess

type FileStoreParams added in v1.8.12 

type FileStoreParams struct {
	Hash string
}

func NewFileStoreParams added in v1.8.12 

func NewFileStoreParams() *FileStoreParams

type Getter added in v1.8.12 

type Getter interface {
	Get(context.Context, Reference) (ChunkData, error)
}

Getter is an interface to retrieve a chunk's data by its reference

type HashWithLength added in v1.7.1 

type HashWithLength struct {
	hash.Hash
}

func (*HashWithLength) ResetWithLength added in v1.7.1 

func (h *HashWithLength) ResetWithLength(length []byte)

type Hasher 

type Hasher func() hash.Hash

type JoinerParams added in v1.8.12 

type JoinerParams struct {
	ChunkerParams
	// contains filtered or unexported fields
}

type LDBDatabase 

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

func NewLDBDatabase 

func NewLDBDatabase(file string) (*LDBDatabase, error)

func (*LDBDatabase) Close 

func (db *LDBDatabase) Close()

func (*LDBDatabase) Delete 

func (db *LDBDatabase) Delete(key []byte) error

func (*LDBDatabase) Get 

func (db *LDBDatabase) Get(key []byte) ([]byte, error)

func (*LDBDatabase) LastKnownTD 

func (db *LDBDatabase) LastKnownTD() []byte

func (*LDBDatabase) NewIterator 

func (db *LDBDatabase) NewIterator() iterator.Iterator

func (*LDBDatabase) Put 

func (db *LDBDatabase) Put(key []byte, value []byte)

func (*LDBDatabase) Write 

func (db *LDBDatabase) Write(batch *leveldb.Batch) error

type LDBStore added in v1.8.12 

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

func NewLDBStore added in v1.8.12 

func NewLDBStore(params *LDBStoreParams) (s *LDBStore, err error)

TODO: Instead of passing the distance function, just pass the address from which distances are calculated to avoid the appearance of a pluggable distance metric and opportunities of bugs associated with providing a function different from the one that is actually used.

func NewMockDbStore added in v1.8.12 

func NewMockDbStore(params *LDBStoreParams, mockStore *mock.NodeStore) (s *LDBStore, err error)

NewMockDbStore creates a new instance of DbStore with mockStore set to a provided value. If mockStore argument is nil, this function behaves exactly as NewDbStore.

func (*LDBStore) BinIndex added in v1.8.16 

func (s *LDBStore) BinIndex(po uint8) uint64

func (*LDBStore) Cleanup added in v1.8.12 

func (s *LDBStore) Cleanup()

func (*LDBStore) Close added in v1.8.12 

func (s *LDBStore) Close()

func (*LDBStore) CurrentStorageIndex added in v1.8.12 

func (s *LDBStore) CurrentStorageIndex() uint64

func (*LDBStore) Delete added in v1.8.16 

func (s *LDBStore) Delete(addr Address)

func (*LDBStore) Export added in v1.8.12 

func (s *LDBStore) Export(out io.Writer) (int64, error)

Export writes all chunks from the store to a tar archive, returning the number of chunks written.

func (*LDBStore) Get added in v1.8.12 

func (s *LDBStore) Get(_ context.Context, addr Address) (chunk Chunk, err error)

func (*LDBStore) Import added in v1.8.12 

func (s *LDBStore) Import(in io.Reader) (int64, error)

of chunks read.

func (*LDBStore) Put added in v1.8.12 

func (s *LDBStore) Put(ctx context.Context, chunk Chunk) error

func (*LDBStore) ReIndex added in v1.8.12 

func (s *LDBStore) ReIndex()

func (*LDBStore) Size added in v1.8.12 

func (s *LDBStore) Size() uint64

func (*LDBStore) SyncIterator added in v1.8.12 

func (s *LDBStore) SyncIterator(since uint64, until uint64, po uint8, f func(Address, uint64) bool) error

SyncIterator(start, stop, po, f) calls f on each hash of a bin po from start to stop

type LDBStoreParams added in v1.8.12 

type LDBStoreParams struct {
	*StoreParams
	Path string
	Po   func(Address) uint8
}

func NewLDBStoreParams added in v1.8.12 

func NewLDBStoreParams(storeparams *StoreParams, path string) *LDBStoreParams

NewLDBStoreParams constructs LDBStoreParams with the specified values.

type LazyChunkReader 

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

LazyChunkReader implements LazySectionReader

func TreeJoin added in v1.8.12 

func TreeJoin(ctx context.Context, addr Address, getter Getter, depth int) *LazyChunkReader

Join reconstructs original content based on a root key. When joining, the caller gets returned a Lazy SectionReader, which is seekable and implements on-demand fetching of chunks as and where it is read. New chunks to retrieve are coming from the getter, which the caller provides. If an error is encountered during joining, it appears as a reader error. The SectionReader. As a result, partial reads from a document are possible even if other parts are corrupt or lost. The chunks are not meant to be validated by the chunker when joining. This is because it is left to the DPA to decide which sources are trusted.

func (*LazyChunkReader) Context added in v1.8.13 

func (r *LazyChunkReader) Context() context.Context

func (*LazyChunkReader) Read 

func (r *LazyChunkReader) Read(b []byte) (read int, err error)

Read keeps a cursor so cannot be called simulateously, see ReadAt

func (*LazyChunkReader) ReadAt 

func (r *LazyChunkReader) ReadAt(b []byte, off int64) (read int, err error)

read at can be called numerous times concurrent reads are allowed Size() needs to be called synchronously on the LazyChunkReader first

func (*LazyChunkReader) Seek 

func (r *LazyChunkReader) Seek(offset int64, whence int) (int64, error)

func (*LazyChunkReader) Size 

func (r *LazyChunkReader) Size(ctx context.Context, quitC chan bool) (n int64, err error)

Size is meant to be called on the LazySectionReader

type LazySectionReader 

type LazySectionReader interface {
	Context() context.Context
	Size(context.Context, chan bool) (int64, error)
	io.Seeker
	io.Reader
	io.ReaderAt
}

Size, Seek, Read, ReadAt

type LazyTestSectionReader 

type LazyTestSectionReader struct {
	*io.SectionReader
}

func (*LazyTestSectionReader) Context added in v1.8.13 

func (r *LazyTestSectionReader) Context() context.Context

func (*LazyTestSectionReader) Size 

func (r *LazyTestSectionReader) Size(context.Context, chan bool) (int64, error)

type LocalStore 

type LocalStore struct {
	Validators []ChunkValidator

	DbStore *LDBStore
	// contains filtered or unexported fields
}

LocalStore is a combination of inmemory db over a disk persisted db implements a Get/Put with fallback (caching) logic using any 2 ChunkStores

func NewLocalStore 

func NewLocalStore(params *LocalStoreParams, mockStore *mock.NodeStore) (*LocalStore, error)

This constructor uses MemStore and DbStore as components

func NewTestLocalStoreForAddr added in v1.8.12 

func NewTestLocalStoreForAddr(params *LocalStoreParams) (*LocalStore, error)

func (*LocalStore) BinIndex added in v1.8.16 

func (ls *LocalStore) BinIndex(po uint8) uint64

func (*LocalStore) Close added in v1.5.9 

func (ls *LocalStore) Close()

Close the local store

func (*LocalStore) FetchFunc added in v1.8.16 

func (ls *LocalStore) FetchFunc(ctx context.Context, addr Address) func(context.Context) error

func (*LocalStore) Get 

func (ls *LocalStore) Get(ctx context.Context, addr Address) (chunk Chunk, err error)

Get(chunk *Chunk) looks up a chunk in the local stores This method is blocking until the chunk is retrieved so additional timeout may be needed to wrap this call if ChunkStores are remote and can have long latency

func (*LocalStore) Iterator added in v1.8.16 

func (ls *LocalStore) Iterator(from uint64, to uint64, po uint8, f func(Address, uint64) bool) error

func (*LocalStore) Put 

func (ls *LocalStore) Put(ctx context.Context, chunk Chunk) error

Put is responsible for doing validation and storage of the chunk by using configured ChunkValidators, MemStore and LDBStore. If the chunk is not valid, its GetErrored function will return ErrChunkInvalid. This method will check if the chunk is already in the MemStore and it will return it if it is. If there is an error from the MemStore.Get, it will be returned by calling GetErrored on the chunk. This method is responsible for closing Chunk.ReqC channel when the chunk is stored in memstore. After the LDBStore.Put, it is ensured that the MemStore contains the chunk with the same data, but nil ReqC channel.

type LocalStoreParams added in v1.8.12 

type LocalStoreParams struct {
	*StoreParams
	ChunkDbPath string
	Validators  []ChunkValidator `toml:"-"`
}

func NewDefaultLocalStoreParams added in v1.8.12 

func NewDefaultLocalStoreParams() *LocalStoreParams

func (*LocalStoreParams) Init added in v1.8.12 

func (p *LocalStoreParams) Init(path string)

this can only finally be set after all config options (file, cmd line, env vars) have been evaluated

type MemStore 

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

func NewMemStore 

func NewMemStore(params *StoreParams, _ *LDBStore) (m *MemStore)

NewMemStore is instantiating a MemStore cache keeping all frequently requested chunks in the `cache` LRU cache.

func (*MemStore) Close added in v1.5.9 

func (s *MemStore) Close()

func (*MemStore) Get 

func (m *MemStore) Get(_ context.Context, addr Address) (Chunk, error)

func (*MemStore) Put 

func (m *MemStore) Put(_ context.Context, c Chunk) error

type NetFetcher added in v1.8.16 

type NetFetcher interface {
	Request(ctx context.Context)
	Offer(ctx context.Context, source *discover.NodeID)
}

type NetStore 

type NetStore struct {
	NewNetFetcherFunc NewNetFetcherFunc
	// contains filtered or unexported fields
}

NetStore is an extension of local storage it implements the ChunkStore interface on request it initiates remote cloud retrieval using a fetcher fetchers are unique to a chunk and are stored in fetchers LRU memory cache fetchFuncFactory is a factory object to create a fetch function for a specific chunk address

func NewNetStore 

func NewNetStore(store SyncChunkStore, nnf NewNetFetcherFunc) (*NetStore, error)

NewNetStore creates a new NetStore object using the given local store. newFetchFunc is a constructor function that can create a fetch function for a specific chunk address.

func (*NetStore) BinIndex added in v1.8.16 

func (n *NetStore) BinIndex(po uint8) uint64

func (*NetStore) Close added in v1.5.9 

func (n *NetStore) Close()

Close chunk store

func (*NetStore) FetchFunc added in v1.8.16 

func (n *NetStore) FetchFunc(ctx context.Context, ref Address) func(context.Context) error

FetchFunc returns nil if the store contains the given address. Otherwise it returns a wait function, which returns after the chunk is available or the context is done

func (*NetStore) Get 

func (n *NetStore) Get(rctx context.Context, ref Address) (Chunk, error)

Get retrieves the chunk from the NetStore DPA synchronously. It calls NetStore.get, and if the chunk is not in local Storage it calls fetch with the request, which blocks until the chunk arrived or context is done

func (*NetStore) Iterator added in v1.8.16 

func (n *NetStore) Iterator(from uint64, to uint64, po uint8, f func(Address, uint64) bool) error

func (*NetStore) Put 

func (n *NetStore) Put(ctx context.Context, ch Chunk) error

Put stores a chunk in localstore, and delivers to all requestor peers using the fetcher stored in the fetchers cache

func (*NetStore) RequestsCacheLen added in v1.8.16 

func (n *NetStore) RequestsCacheLen() int

RequestsCacheLen returns the current number of outgoing requests stored in the cache

type NewNetFetcherFunc added in v1.8.16 

type NewNetFetcherFunc func(ctx context.Context, addr Address, peers *sync.Map) NetFetcher

type Peer 

type Peer interface{}

Peer is the recorded as Source on the chunk should probably not be here? but network should wrap chunk object

type Putter added in v1.8.12 

type Putter interface {
	Put(context.Context, ChunkData) (Reference, error)
	// RefSize returns the length of the Reference created by this Putter
	RefSize() int64
	// Close is to indicate that no more chunk data will be Put on this Putter
	Close()
	// Wait returns if all data has been store and the Close() was called.
	Wait(context.Context) error
}

Putter is responsible to store data and create a reference for it

type PyramidChunker 

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

func NewPyramidSplitter added in v1.8.12 

func NewPyramidSplitter(params *PyramidSplitterParams) (pc *PyramidChunker)

func (*PyramidChunker) Append added in v1.7.1 

func (pc *PyramidChunker) Append(ctx context.Context) (k Address, wait func(context.Context) error, err error)

func (*PyramidChunker) Join added in v1.7.1 

func (pc *PyramidChunker) Join(addr Address, getter Getter, depth int) LazySectionReader

func (*PyramidChunker) Split 

func (pc *PyramidChunker) Split(ctx context.Context) (k Address, wait func(context.Context) error, err error)

type PyramidSplitterParams added in v1.8.12 

type PyramidSplitterParams struct {
	SplitterParams
	// contains filtered or unexported fields
}

func NewPyramidSplitterParams added in v1.8.12 

func NewPyramidSplitterParams(addr Address, reader io.Reader, putter Putter, getter Getter, chunkSize int64) *PyramidSplitterParams

type Reference added in v1.8.12 

type Reference []byte

type SplitterParams added in v1.8.12 

type SplitterParams struct {
	ChunkerParams
	// contains filtered or unexported fields
}

type StoreParams 

type StoreParams struct {
	Hash          SwarmHasher `toml:"-"`
	DbCapacity    uint64
	CacheCapacity uint
	BaseKey       []byte
}

func NewDefaultStoreParams added in v1.8.0 

func NewDefaultStoreParams() *StoreParams

func NewStoreParams 

func NewStoreParams(ldbCap uint64, cacheCap uint, hash SwarmHasher, basekey []byte) *StoreParams

type SwarmHash added in v1.7.1 

type SwarmHash interface {
	hash.Hash
	ResetWithLength([]byte)
}

type SwarmHasher added in v1.7.1 

type SwarmHasher func() SwarmHash

func MakeHashFunc 

func MakeHashFunc(hash string) SwarmHasher

type SyncChunkStore added in v1.8.16 

type SyncChunkStore interface {
	ChunkStore
	BinIndex(po uint8) uint64
	Iterator(from uint64, to uint64, po uint8, f func(Address, uint64) bool) error
	FetchFunc(ctx context.Context, ref Address) func(context.Context) error
}

SyncChunkStore is a ChunkStore which supports syncing

type TreeChunker 

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

func NewTreeJoiner added in v1.8.12 

func NewTreeJoiner(params *JoinerParams) *TreeChunker

func NewTreeSplitter added in v1.8.12 

func NewTreeSplitter(params *TreeSplitterParams) *TreeChunker

func (*TreeChunker) Append added in v1.7.1 

func (tc *TreeChunker) Append() (Address, func(), error)

func (*TreeChunker) Join 

func (tc *TreeChunker) Join(ctx context.Context) *LazyChunkReader

func (*TreeChunker) Split 

func (tc *TreeChunker) Split(ctx context.Context) (k Address, wait func(context.Context) error, err error)

type TreeEntry added in v1.7.1 

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

Entry to create a tree node

func NewTreeEntry added in v1.7.1 

func NewTreeEntry(pyramid *PyramidChunker) *TreeEntry

type TreeSplitterParams added in v1.8.12 

type TreeSplitterParams struct {
	SplitterParams
	// contains filtered or unexported fields
}

Source Files

View all Source files

Directories

Path Synopsis
Package mock defines types that are used by different implementations of mock storages.
 Package mock defines types that are used by different implementations of mock storages.
db
Package db implements a mock store that keeps all chunk data in LevelDB database.
 Package db implements a mock store that keeps all chunk data in LevelDB database.
mem
Package mem implements a mock store that keeps all chunk data in memory.
 Package mem implements a mock store that keeps all chunk data in memory.
rpc
Package rpc implements an RPC client that connect to a centralized mock store.
 Package rpc implements an RPC client that connect to a centralized mock store.
test
Package test provides functions that are used for testing GlobalStorer implementations.
 Package test provides functions that are used for testing GlobalStorer implementations.
Package mru defines Mutable resource updates.
 Package mru defines Mutable resource updates.

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