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Unified writer interface for Data Availability providers
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,96 @@ | ||
| // Copyright 2021-2022, Offchain Labs, Inc. | ||
| // For license information, see https://github.com/nitro/blob/master/LICENSE | ||
|
|
||
| package daprovider | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
|
|
||
| "github.com/ethereum/go-ethereum/common" | ||
| "github.com/ethereum/go-ethereum/log" | ||
| "github.com/offchainlabs/nitro/arbutil" | ||
| "github.com/offchainlabs/nitro/util/blobs" | ||
| ) | ||
|
|
||
| type Reader interface { | ||
| // IsValidHeaderByte returns true if the given headerByte has bits corresponding to the DA provider | ||
| IsValidHeaderByte(headerByte byte) bool | ||
|
|
||
| // RecoverPayloadFromBatch fetches the underlying payload from the DA provider given the batch header information | ||
| RecoverPayloadFromBatch( | ||
| ctx context.Context, | ||
| batchNum uint64, | ||
| batchBlockHash common.Hash, | ||
| sequencerMsg []byte, | ||
| preimages map[arbutil.PreimageType]map[common.Hash][]byte, | ||
| keysetValidationMode KeysetValidationMode, | ||
| ) ([]byte, error) | ||
| } | ||
|
|
||
| // NewReaderForDAS is generally meant to be only used by nitro. | ||
| // DA Providers should implement methods in the Reader interface independently | ||
| func NewReaderForDAS(dasReader DASReader) *readerForDAS { | ||
| return &readerForDAS{dasReader: dasReader} | ||
| } | ||
|
|
||
| type readerForDAS struct { | ||
| dasReader DASReader | ||
| } | ||
|
|
||
| func (d *readerForDAS) IsValidHeaderByte(headerByte byte) bool { | ||
| return IsDASMessageHeaderByte(headerByte) | ||
| } | ||
|
|
||
| func (d *readerForDAS) RecoverPayloadFromBatch( | ||
| ctx context.Context, | ||
| batchNum uint64, | ||
| batchBlockHash common.Hash, | ||
| sequencerMsg []byte, | ||
| preimages map[arbutil.PreimageType]map[common.Hash][]byte, | ||
| keysetValidationMode KeysetValidationMode, | ||
| ) ([]byte, error) { | ||
| return RecoverPayloadFromDasBatch(ctx, batchNum, sequencerMsg, d.dasReader, preimages, keysetValidationMode) | ||
| } | ||
|
|
||
| // NewReaderForBlobReader is generally meant to be only used by nitro. | ||
| // DA Providers should implement methods in the Reader interface independently | ||
| func NewReaderForBlobReader(blobReader BlobReader) *readerForBlobReader { | ||
| return &readerForBlobReader{blobReader: blobReader} | ||
| } | ||
|
|
||
| type readerForBlobReader struct { | ||
| blobReader BlobReader | ||
| } | ||
|
|
||
| func (b *readerForBlobReader) IsValidHeaderByte(headerByte byte) bool { | ||
| return IsBlobHashesHeaderByte(headerByte) | ||
| } | ||
|
|
||
| func (b *readerForBlobReader) RecoverPayloadFromBatch( | ||
| ctx context.Context, | ||
| batchNum uint64, | ||
| batchBlockHash common.Hash, | ||
| sequencerMsg []byte, | ||
| preimages map[arbutil.PreimageType]map[common.Hash][]byte, | ||
| keysetValidationMode KeysetValidationMode, | ||
| ) ([]byte, error) { | ||
| blobHashes := sequencerMsg[41:] | ||
| if len(blobHashes)%len(common.Hash{}) != 0 { | ||
| return nil, fmt.Errorf("blob batch data is not a list of hashes as expected") | ||
| } | ||
| versionedHashes := make([]common.Hash, len(blobHashes)/len(common.Hash{})) | ||
| for i := 0; i*32 < len(blobHashes); i += 1 { | ||
| copy(versionedHashes[i][:], blobHashes[i*32:(i+1)*32]) | ||
| } | ||
| kzgBlobs, err := b.blobReader.GetBlobs(ctx, batchBlockHash, versionedHashes) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to get blobs: %w", err) | ||
| } | ||
| payload, err := blobs.DecodeBlobs(kzgBlobs) | ||
| if err != nil { | ||
| log.Warn("Failed to decode blobs", "batchBlockHash", batchBlockHash, "versionedHashes", versionedHashes, "err", err) | ||
| return nil, nil | ||
| } | ||
| return payload, nil | ||
| } |
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