mirror of
https://github.com/ethereum/go-ethereum.git
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ac8164f5a4
* port changes from #1013 * port changes from #1068 * go.mod tidy * fix compile error * fix goimports * fix log * address review comments * upgrade golang.org/x/net to 0.23.0 * bump version * remove unused flag * update da-codec commit --------- Co-authored-by: Péter Garamvölgyi <peter@scroll.io>
92 lines
2.8 KiB
Go
92 lines
2.8 KiB
Go
package blob_client
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import (
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"context"
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"crypto/sha256"
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"encoding/hex"
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"encoding/json"
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"fmt"
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"net/http"
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"net/url"
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"github.com/scroll-tech/go-ethereum/common"
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"github.com/scroll-tech/go-ethereum/common/hexutil"
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"github.com/scroll-tech/go-ethereum/crypto/kzg4844"
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)
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type BlobScanClient struct {
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client *http.Client
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apiEndpoint string
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}
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func NewBlobScanClient(apiEndpoint string) *BlobScanClient {
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return &BlobScanClient{
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client: http.DefaultClient,
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apiEndpoint: apiEndpoint,
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}
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}
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func (c *BlobScanClient) GetBlobByVersionedHashAndBlockNumber(ctx context.Context, versionedHash common.Hash, blockNumber uint64) (*kzg4844.Blob, error) {
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// blobscan api docs https://api.blobscan.com/#/blobs/blob-getByBlobId
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path, err := url.JoinPath(c.apiEndpoint, versionedHash.String())
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if err != nil {
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return nil, fmt.Errorf("failed to join path, err: %w", err)
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}
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req, err := http.NewRequestWithContext(ctx, "GET", path, nil)
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if err != nil {
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return nil, fmt.Errorf("cannot create request, err: %w", err)
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}
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req.Header.Set("accept", "application/json")
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resp, err := c.client.Do(req)
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if err != nil {
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return nil, fmt.Errorf("cannot do request, err: %w", err)
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
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if resp.StatusCode == http.StatusNotFound {
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return nil, fmt.Errorf("no blob with versioned hash : %s", versionedHash.String())
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}
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var res ErrorRespBlobScan
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err = json.NewDecoder(resp.Body).Decode(&res)
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if err != nil {
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return nil, fmt.Errorf("failed to decode result into struct, err: %w", err)
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}
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return nil, fmt.Errorf("error while fetching blob, message: %s, code: %s, versioned hash: %s", res.Message, res.Code, versionedHash.String())
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}
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var result BlobRespBlobScan
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err = json.NewDecoder(resp.Body).Decode(&result)
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if err != nil {
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return nil, fmt.Errorf("failed to decode result into struct, err: %w", err)
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}
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blobBytes, err := hex.DecodeString(result.Data[2:])
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if err != nil {
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return nil, fmt.Errorf("failed to decode data to bytes, err: %w", err)
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}
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if len(blobBytes) != lenBlobBytes {
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return nil, fmt.Errorf("len of blob data is not correct, expected: %d, got: %d", lenBlobBytes, len(blobBytes))
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}
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blob := kzg4844.Blob(blobBytes)
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// sanity check that retrieved blob matches versioned hash
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commitment, err := kzg4844.BlobToCommitment(&blob)
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if err != nil {
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return nil, fmt.Errorf("failed to convert blob to commitment, err: %w", err)
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}
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blobVersionedHash := kzg4844.CalcBlobHashV1(sha256.New(), &commitment)
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if blobVersionedHash != versionedHash {
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return nil, fmt.Errorf("blob versioned hash mismatch, expected: %s, got: %s", versionedHash.String(), hexutil.Encode(blobVersionedHash[:]))
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}
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return &blob, nil
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}
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type BlobRespBlobScan struct {
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Data string `json:"data"`
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}
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type ErrorRespBlobScan struct {
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Message string `json:"message"`
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Code string `json:"code"`
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}
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