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Documentation

Index

• Variables
• type Retriever
  • func NewRetriever(bServ blockservice.BlockService) *Retriever
  • func (r *Retriever) Retrieve(ctx context.Context, dah *da.DataAvailabilityHeader) (*rsmt2d.ExtendedDataSquare, error)

Variables

var RetrieveQuadrantTimeout = blockTime / numQuadrants * 2

RetrieveQuadrantTimeout defines how much time Retriever waits before starting to retrieve another quadrant.

NOTE: - The whole data square must be retrieved in less than block time. - We have 4 quadrants from two sources(rows, cols) which equals to 8 in total.

Types

type Retriever

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

Retriever retrieves rsmt2d.ExtendedDataSquares from the IPLD network. Instead of requesting data 'share by share' it requests data by quadrants minimizing bandwidth usage in the happy cases.

 ---- ----
| 0  | 1  |
 ---- ----
| 2  | 3  |
 ---- ----

Retriever randomly picks one of the data square quadrants and tries to request them one by one until it is able to reconstruct the whole square.

func NewRetriever

func NewRetriever(bServ blockservice.BlockService) *Retriever

NewRetriever creates a new instance of the Retriever over IPLD BlockService and rmst2d.Codec

func (*Retriever) Retrieve

func (r *Retriever) Retrieve(ctx context.Context, dah *da.DataAvailabilityHeader) (*rsmt2d.ExtendedDataSquare, error)

Retrieve retrieves all the data committed to DataAvailabilityHeader.

If not available locally, it aims to request from the network only one quadrant (1/4) of the data square and reconstructs the other three quadrants (3/4). If the requested quadrant is not available within RetrieveQuadrantTimeout, it starts requesting another quadrant until either the data is reconstructed, context is canceled or ErrByzantine is generated.