blockservice

package
Version: v0.4.17 Latest Latest
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Published: Jul 27, 2018 License: MIT Imports: 10 Imported by: 0

Documentation

Overview

package blockservice implements a BlockService interface that provides a single GetBlock/AddBlock interface that seamlessly retrieves data either locally or from a remote peer through the exchange.

Index

Constants

This section is empty.

Variables

View Source
var ErrNotFound = errors.New("blockservice: key not found")

Functions

This section is empty.

Types

type BlockGetter added in v0.4.14

type BlockGetter interface {
	// GetBlock gets the requested block.
	GetBlock(ctx context.Context, c *cid.Cid) (blocks.Block, error)

	// GetBlocks does a batch request for the given cids, returning blocks as
	// they are found, in no particular order.
	//
	// It may not be able to find all requested blocks (or the context may
	// be canceled). In that case, it will close the channel early. It is up
	// to the consumer to detect this situation and keep track which blocks
	// it has received and which it hasn't.
	GetBlocks(ctx context.Context, ks []*cid.Cid) <-chan blocks.Block
}

BlockGetter is the common interface shared between blockservice sessions and the blockservice.

type BlockService

type BlockService interface {
	io.Closer
	BlockGetter

	// Blockstore returns a reference to the underlying blockstore
	Blockstore() blockstore.Blockstore

	// Exchange returns a reference to the underlying exchange (usually bitswap)
	Exchange() exchange.Interface

	// AddBlock puts a given block to the underlying datastore
	AddBlock(o blocks.Block) error

	// AddBlocks adds a slice of blocks at the same time using batching
	// capabilities of the underlying datastore whenever possible.
	AddBlocks(bs []blocks.Block) error

	// DeleteBlock deletes the given block from the blockservice.
	DeleteBlock(o *cid.Cid) error
}

BlockService is a hybrid block datastore. It stores data in a local datastore and may retrieve data from a remote Exchange. It uses an internal `datastore.Datastore` instance to store values.

func New

NewBlockService creates a BlockService with given datastore instance.

func NewWriteThrough added in v0.4.5

func NewWriteThrough(bs blockstore.Blockstore, rem exchange.Interface) BlockService

NewWriteThrough ceates a BlockService that guarantees writes will go through to the blockstore and are not skipped by cache checks.

type Session added in v0.4.11

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

Session is a helper type to provide higher level access to bitswap sessions

func NewSession added in v0.4.11

func NewSession(ctx context.Context, bs BlockService) *Session

NewSession creates a new session that allows for controlled exchange of wantlists to decrease the bandwidth overhead. If the current exchange is a SessionExchange, a new exchange session will be created. Otherwise, the current exchange will be used directly.

func (*Session) GetBlock added in v0.4.11

func (s *Session) GetBlock(ctx context.Context, c *cid.Cid) (blocks.Block, error)

GetBlock gets a block in the context of a request session

func (*Session) GetBlocks added in v0.4.11

func (s *Session) GetBlocks(ctx context.Context, ks []*cid.Cid) <-chan blocks.Block

GetBlocks gets blocks in the context of a request session

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