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(follower_node)support beacon node client as blob provider (#988)
* support beacon node client as blob provider * fix * fix formatting * use url.JoinPath instead of path * don't move pos each time in blob_client_list --------- Co-authored-by: jonastheis <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,183 @@ | ||
| package blob_client | ||
|
|
||
| import ( | ||
| "context" | ||
| "crypto/sha256" | ||
| "encoding/json" | ||
| "fmt" | ||
| "io" | ||
| "net/http" | ||
| "net/url" | ||
| "strconv" | ||
|
|
||
| "github.com/scroll-tech/go-ethereum/common" | ||
| "github.com/scroll-tech/go-ethereum/crypto/kzg4844" | ||
| "github.com/scroll-tech/go-ethereum/rollup/rollup_sync_service" | ||
| ) | ||
|
|
||
| type BeaconNodeClient struct { | ||
| apiEndpoint string | ||
| l1Client *rollup_sync_service.L1Client | ||
| genesisTime uint64 | ||
| secondsPerSlot uint64 | ||
| } | ||
|
|
||
| var ( | ||
| beaconNodeGenesisEndpoint = "/eth/v1/beacon/genesis" | ||
| beaconNodeSpecEndpoint = "/eth/v1/config/spec" | ||
| beaconNodeBlobEndpoint = "/eth/v1/beacon/blob_sidecars" | ||
| ) | ||
|
|
||
| func NewBeaconNodeClient(apiEndpoint string, l1Client *rollup_sync_service.L1Client) (*BeaconNodeClient, error) { | ||
| // get genesis time | ||
| genesisPath, err := url.JoinPath(apiEndpoint, beaconNodeGenesisEndpoint) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to join path, err: %w", err) | ||
| } | ||
| resp, err := http.Get(genesisPath) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("cannot do request, err: %w", err) | ||
| } | ||
| defer resp.Body.Close() | ||
|
|
||
| if resp.StatusCode != http.StatusOK { | ||
| body, _ := io.ReadAll(resp.Body) | ||
| bodyStr := string(body) | ||
| return nil, fmt.Errorf("beacon node request failed, status: %s, body: %s", resp.Status, bodyStr) | ||
| } | ||
|
|
||
| var genesisResp GenesisResp | ||
| err = json.NewDecoder(resp.Body).Decode(&genesisResp) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to decode result into struct, err: %w", err) | ||
| } | ||
| genesisTime, err := strconv.ParseUint(genesisResp.Data.GenesisTime, 10, 64) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to decode genesis time %s, err: %w", genesisResp.Data.GenesisTime, err) | ||
| } | ||
|
|
||
| // get seconds per slot from spec | ||
| specPath, err := url.JoinPath(apiEndpoint, beaconNodeSpecEndpoint) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to join path, err: %w", err) | ||
| } | ||
| resp, err = http.Get(specPath) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("cannot do request, err: %w", err) | ||
| } | ||
| defer resp.Body.Close() | ||
|
|
||
| if resp.StatusCode != http.StatusOK { | ||
| body, _ := io.ReadAll(resp.Body) | ||
| bodyStr := string(body) | ||
| return nil, fmt.Errorf("beacon node request failed, status: %s, body: %s", resp.Status, bodyStr) | ||
| } | ||
|
|
||
| var specResp SpecResp | ||
| err = json.NewDecoder(resp.Body).Decode(&specResp) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to decode result into struct, err: %w", err) | ||
| } | ||
| secondsPerSlot, err := strconv.ParseUint(specResp.Data.SecondsPerSlot, 10, 64) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to decode seconds per slot %s, err: %w", specResp.Data.SecondsPerSlot, err) | ||
| } | ||
| if secondsPerSlot == 0 { | ||
| return nil, fmt.Errorf("failed to make new BeaconNodeClient, secondsPerSlot is 0") | ||
| } | ||
|
|
||
| return &BeaconNodeClient{ | ||
| apiEndpoint: apiEndpoint, | ||
| l1Client: l1Client, | ||
| genesisTime: genesisTime, | ||
| secondsPerSlot: secondsPerSlot, | ||
| }, nil | ||
| } | ||
|
|
||
| func (c *BeaconNodeClient) GetBlobByVersionedHashAndBlockNumber(ctx context.Context, versionedHash common.Hash, blockNumber uint64) (*kzg4844.Blob, error) { | ||
| // get block timestamp to calculate slot | ||
| header, err := c.l1Client.GetHeaderByNumber(blockNumber) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to get header by number, err: %w", err) | ||
| } | ||
| slot := (header.Time - c.genesisTime) / c.secondsPerSlot | ||
|
|
||
| // get blob sidecar for slot | ||
| blobSidecarPath, err := url.JoinPath(c.apiEndpoint, beaconNodeBlobEndpoint, fmt.Sprintf("%d", slot)) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to join path, err: %w", err) | ||
| } | ||
| resp, err := http.Get(blobSidecarPath) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("cannot do request, err: %w", err) | ||
| } | ||
| defer resp.Body.Close() | ||
|
|
||
| if resp.StatusCode != http.StatusOK { | ||
| body, _ := io.ReadAll(resp.Body) | ||
| bodyStr := string(body) | ||
| return nil, fmt.Errorf("beacon node request failed, status: %s, body: %s", resp.Status, bodyStr) | ||
| } | ||
|
|
||
| var blobSidecarResp BlobSidecarResp | ||
| err = json.NewDecoder(resp.Body).Decode(&blobSidecarResp) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to decode result into struct, err: %w", err) | ||
| } | ||
|
|
||
| // find blob with desired versionedHash | ||
| for _, blob := range blobSidecarResp.Data { | ||
| // calculate blob hash from commitment and check it with desired | ||
| commitmentBytes := common.FromHex(blob.KzgCommitment) | ||
| if len(commitmentBytes) != lenKZGCommitment { | ||
| return nil, fmt.Errorf("len of kzg commitment is not correct, expected: %d, got: %d", lenKZGCommitment, len(commitmentBytes)) | ||
| } | ||
| commitment := kzg4844.Commitment(commitmentBytes) | ||
| blobVersionedHash := kzg4844.CalcBlobHashV1(sha256.New(), &commitment) | ||
|
|
||
| if blobVersionedHash == versionedHash { | ||
| // found desired blob | ||
| blobBytes := common.FromHex(blob.Blob) | ||
| if len(blobBytes) != lenBlobBytes { | ||
| return nil, fmt.Errorf("len of blob data is not correct, expected: %d, got: %d", lenBlobBytes, len(blobBytes)) | ||
| } | ||
|
|
||
| b := kzg4844.Blob(blobBytes) | ||
| return &b, nil | ||
| } | ||
| } | ||
|
|
||
| return nil, fmt.Errorf("missing blob %v in slot %d, block number %d", versionedHash, slot, blockNumber) | ||
| } | ||
|
|
||
| type GenesisResp struct { | ||
| Data struct { | ||
| GenesisTime string `json:"genesis_time"` | ||
| } `json:"data"` | ||
| } | ||
|
|
||
| type SpecResp struct { | ||
| Data struct { | ||
| SecondsPerSlot string `json:"SECONDS_PER_SLOT"` | ||
| } `json:"data"` | ||
| } | ||
|
|
||
| type BlobSidecarResp struct { | ||
| Data []struct { | ||
| Index string `json:"index"` | ||
| Blob string `json:"blob"` | ||
| KzgCommitment string `json:"kzg_commitment"` | ||
| KzgProof string `json:"kzg_proof"` | ||
| SignedBlockHeader struct { | ||
| Message struct { | ||
| Slot string `json:"slot"` | ||
| ProposerIndex string `json:"proposer_index"` | ||
| ParentRoot string `json:"parent_root"` | ||
| StateRoot string `json:"state_root"` | ||
| BodyRoot string `json:"body_root"` | ||
| } `json:"message"` | ||
| Signature string `json:"signature"` | ||
| } `json:"signed_block_header"` | ||
| KzgCommitmentInclusionProof []string `json:"kzg_commitment_inclusion_proof"` | ||
| } `json:"data"` | ||
| } |
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