storage

package
v0.4.2 Latest Latest
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 Go to latest Published: Jun 28, 2019 License: GPL-3.0 Imports: 29 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
	ErrUnauthorized
	ErrInvalidValue
	ErrDataOverflow
	ErrNothingToReturn
	ErrInvalidSignature
	ErrNotSynced
)
View Source 
const (
	BMTHash     = "BMT"
	SHA3Hash    = "SHA3" // http://golang.org/pkg/hash/#Hash
	DefaultHash = BMTHash
)
View Source 
const AddressLength = chunk.AddressLength

AddressLength is the same as chunk.AddressLength for backward compatibility.

View Source 
const (
	ChunkProcessors = 8
)
View Source 
const MaxPO = chunk.MaxPO

MaxPO is the same as chunk.MaxPO for backward compatibility.

Variables

View Source 
var (
	ErrChunkNotFound = chunk.ErrChunkNotFound
	ErrChunkInvalid  = chunk.ErrChunkNotFound
)

Errors are the same as the ones in chunk package for backward compatibility.

View Source 
var (
	ErrNoSuitablePeer = errors.New("no suitable peer")
)
View Source 
var NewChunk = chunk.NewChunk

NewChunk is the same as chunk.NewChunk for backward compatibility.

View Source 
var Proximity = chunk.Proximity

Proximity is the same as chunk.Proximity for backward compatibility.

View Source 
var ZeroAddr = chunk.ZeroAddr

ZeroAddr is the same as chunk.ZeroAddr for backward compatibility.

Functions

func NewHasherStore 

func NewHasherStore(store ChunkStore, hashFunc SwarmHasher, toEncrypt bool, tag *chunk.Tag) *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

Types

type Address 

type Address = chunk.Address

Address is an alias for chunk.Address for backward compatibility.

func PyramidAppend 

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

func PyramidSplit 

func PyramidSplit(ctx context.Context, reader io.Reader, putter Putter, getter Getter, tag *chunk.Tag) (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 

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.

type AddressCollection 

type AddressCollection []Address

func NewAddressCollection 

func NewAddressCollection(l int) AddressCollection

func (AddressCollection) Len 

func (c AddressCollection) Len() int

func (AddressCollection) Less 

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

func (AddressCollection) Swap 

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

type Chunk 

type Chunk = chunk.Chunk

Chunk is an alias for chunk.Chunk for backward compatibility.

func GenerateRandomChunk 

func GenerateRandomChunk(dataSize int64) Chunk

func GenerateRandomChunks 

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

type ChunkData 

type ChunkData []byte

func (ChunkData) Size 

func (c ChunkData) Size() uint64

NOTE: this returns invalid data if chunk is encrypted

type ChunkStore 

type ChunkStore = chunk.Store

type ChunkValidator 

type ChunkValidator = chunk.Validator

type ChunkerParams 

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

type ContentAddressValidator 

type ContentAddressValidator struct {
	Hasher SwarmHasher
}

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

func NewContentAddressValidator 

func NewContentAddressValidator(hasher SwarmHasher) *ContentAddressValidator

Constructor

func (*ContentAddressValidator) Validate 

func (v *ContentAddressValidator) Validate(ch Chunk) bool

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

type FakeChunkStore 

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 

func (f *FakeChunkStore) Close() error

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

func (*FakeChunkStore) Get 

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

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

func (*FakeChunkStore) Has 

func (f *FakeChunkStore) Has(_ context.Context, ref Address) (bool, error)

Has doesn't do anything it is just here to implement ChunkStore

func (*FakeChunkStore) LastPullSubscriptionBinID 

func (f *FakeChunkStore) LastPullSubscriptionBinID(bin uint8) (id uint64, err error)

func (*FakeChunkStore) Put 

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

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

func (*FakeChunkStore) Set 

func (f *FakeChunkStore) Set(ctx context.Context, mode chunk.ModeSet, addr chunk.Address) (err error)

func (*FakeChunkStore) SubscribePull 

func (f *FakeChunkStore) SubscribePull(ctx context.Context, bin uint8, since, until uint64) (c <-chan chunk.Descriptor, stop func())

type Fetcher added in v0.4.2 

type Fetcher struct {
	Delivered chan struct{} // when closed, it means that the chunk this Fetcher refers to is delivered

	CreatedAt time.Time // timestamp when the fetcher was created, used for metrics measuring lifetime of fetchers
	CreatedBy string    // who created the fetcher - "request" or "syncing", used for metrics measuring lifecycle of fetchers

	RequestedBySyncer bool // whether we have issued at least once a request through Offered/Wanted hashes flow
	// contains filtered or unexported fields
}

Fetcher is a struct which maintains state of remote requests. Fetchers are stored in fetchers map and signal to all interested parties if a given chunk is delivered the mutex controls who closes the channel, and make sure we close the channel only once

func NewFetcher added in v0.4.2 

func NewFetcher() *Fetcher

NewFetcher is a constructor for a Fetcher

func (*Fetcher) SafeClose added in v0.4.2 

func (fi *Fetcher) SafeClose()

SafeClose signals to interested parties (those waiting for a signal on fi.Delivered) that a chunk is delivered. It closes the fi.Delivered channel through the sync.Once object, because it is possible for a chunk to be delivered multiple times concurrently.

type FileStore 

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

func NewFileStore 

func NewFileStore(store ChunkStore, params *FileStoreParams, tags *chunk.Tags) *FileStore

func NewLocalFileStore 

func NewLocalFileStore(datadir string, basekey []byte, tags *chunk.Tags) (*FileStore, func(), error)

for testing locally

func (*FileStore) GetAllReferences 

func (f *FileStore) GetAllReferences(ctx context.Context, data io.Reader, toEncrypt bool) (addrs AddressCollection, err error)

GetAllReferences is a public API. This endpoint returns all chunk hashes (only) for a given file

func (*FileStore) HashSize 

func (f *FileStore) HashSize() int

func (*FileStore) Retrieve 

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

Retrieve is a 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 

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

Store is a public API. Main entry point for document storage directly. Used by the FS-aware API and httpaccess

type FileStoreParams 

type FileStoreParams struct {
	Hash string
}

func NewFileStoreParams 

func NewFileStoreParams() *FileStoreParams

type Getter 

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

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

type HashWithLength 

type HashWithLength struct {
	hash.Hash
}

func (*HashWithLength) ResetWithLength 

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

type JoinerParams 

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

type LNetStore added in v0.4.2 

type LNetStore struct {
	*NetStore
}

LNetStore is a wrapper of NetStore, which implements the chunk.Store interface. It is used only by the FileStore, the component used by the Swarm API to store and retrieve content and to split and join chunks.

func NewLNetStore added in v0.4.2 

func NewLNetStore(store *NetStore) *LNetStore

NewLNetStore is a constructor for LNetStore

func (*LNetStore) Get added in v0.4.2 

func (n *LNetStore) Get(ctx context.Context, mode chunk.ModeGet, ref Address) (ch Chunk, err error)

Get converts a chunk reference to a chunk Request (with empty Origin), handled by the NetStore, and returns the requested chunk, or error.

type LazyChunkReader 

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

LazyChunkReader implements LazySectionReader

func TreeJoin 

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 

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 

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

func (*LazyTestSectionReader) Size 

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

type NetStore 

type NetStore struct {
	chunk.Store

	RemoteGet RemoteGetFunc
	// contains filtered or unexported fields
}

NetStore is an extension of LocalStore it implements the ChunkStore interface on request it initiates remote cloud retrieval

func NewNetStore 

func NewNetStore(store chunk.Store, localID enode.ID) *NetStore

NewNetStore creates a new NetStore using the provided chunk.Store and localID of the node.

func (*NetStore) Close 

func (n *NetStore) Close() error

Close chunk store

func (*NetStore) Get 

func (n *NetStore) Get(ctx context.Context, mode chunk.ModeGet, req *Request) (Chunk, error)

Get retrieves a chunk If it is not found in the LocalStore then it uses RemoteGet to fetch from the network.

func (*NetStore) GetOrCreateFetcher added in v0.4.2 

func (n *NetStore) GetOrCreateFetcher(ctx context.Context, ref Address, interestedParty string) (f *Fetcher, loaded bool, ok bool)

GetOrCreateFetcher returns the Fetcher for a given chunk, if this chunk is not in the LocalStore. If the chunk is in the LocalStore, it returns nil for the Fetcher and ok == false

func (*NetStore) Has added in v0.4.2 

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

Has is the storage layer entry point to query the underlying database to return if it has a chunk or not.

func (*NetStore) Put 

func (n *NetStore) Put(ctx context.Context, mode chunk.ModePut, ch Chunk) (bool, error)

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

func (*NetStore) RemoteFetch added in v0.4.2 

func (n *NetStore) RemoteFetch(ctx context.Context, req *Request, fi *Fetcher) error

RemoteFetch is handling the retry mechanism when making a chunk request to our peers. For a given chunk Request, we call RemoteGet, which selects the next eligible peer and issues a RetrieveRequest and we wait for a delivery. If a delivery doesn't arrive within the SearchTimeout we retry.

type Putter 

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 

func NewPyramidSplitter(params *PyramidSplitterParams, tag *chunk.Tag) (pc *PyramidChunker)

func (*PyramidChunker) Append 

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

func (*PyramidChunker) Join 

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 

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

func NewPyramidSplitterParams 

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

type Reference 

type Reference []byte

type RemoteGetFunc added in v0.4.2 

type RemoteGetFunc func(ctx context.Context, req *Request, localID enode.ID) (*enode.ID, error)

type Request added in v0.4.2 

type Request struct {
	Addr        Address  // chunk address
	Origin      enode.ID // who is sending us that request? we compare Origin to the suggested peer from RequestFromPeers
	PeersToSkip sync.Map // peers not to request chunk from
}

Request encapsulates all the necessary arguments when making a request to NetStore. These could have also been added as part of the interface of NetStore.Get, but a request struct seemed like a better option

func NewRequest added in v0.4.2 

func NewRequest(addr Address) *Request

NewRequest returns a new instance of Request based on chunk address skip check and a map of peers to skip.

func (*Request) SkipPeer added in v0.4.2 

func (r *Request) SkipPeer(nodeID string) bool

SkipPeer returns if the peer with nodeID should not be requested to deliver a chunk. Peers to skip are kept per Request and for a time period of FailedPeerSkipDelay.

type SplitterParams 

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 

func NewDefaultStoreParams() *StoreParams

func NewStoreParams 

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

type SwarmHash 

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

type SwarmHasher 

type SwarmHasher func() SwarmHash

func MakeHashFunc 

func MakeHashFunc(hash string) SwarmHasher

type TreeChunker 

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

func NewTreeJoiner 

func NewTreeJoiner(params *JoinerParams) *TreeChunker

func NewTreeSplitter 

func NewTreeSplitter(params *TreeSplitterParams) *TreeChunker

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 

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

Entry to create a tree node

func NewTreeEntry 

func NewTreeEntry(pyramid *PyramidChunker) *TreeEntry

type TreeSplitterParams 

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

Source Files

View all Source files

Directories

Path Synopsis
Package feeds defines Swarm Feeds.
 Package feeds defines Swarm Feeds.
lookup
Package lookup defines feed lookup algorithms and provides tools to place updates so they can be found
 Package lookup defines feed lookup algorithms and provides tools to place updates so they can be found
Package localstore provides disk storage layer for Swarm Chunk persistence.
 Package localstore provides disk storage layer for Swarm Chunk persistence.
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.
explorer
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.

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