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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,87 @@ | ||
| // Copyright 2024, Offchain Labs, Inc. | ||
| // For license information, see https://github.com/nitro/blob/master/LICENSE | ||
|
|
||
| // This file contains functions related to the delay buffer feature that are used mostly in the | ||
| // batch poster. | ||
|
|
||
| package arbnode | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "math/big" | ||
|
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||
| "github.com/ethereum/go-ethereum/accounts/abi/bind" | ||
| "github.com/ethereum/go-ethereum/common" | ||
| "github.com/ethereum/go-ethereum/crypto" | ||
|
|
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| "github.com/offchainlabs/bold/solgen/go/bridgegen" | ||
| "github.com/offchainlabs/nitro/arbos/arbostypes" | ||
| "github.com/offchainlabs/nitro/util/headerreader" | ||
| ) | ||
|
|
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| // DelayBufferConfig originates from the sequencer inbox contract. | ||
| type DelayBufferConfig struct { | ||
| Enabled bool | ||
| Threshold uint64 | ||
| } | ||
|
|
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| // GetBufferConfig gets the delay buffer config from the sequencer inbox contract. | ||
| // If the contract doesn't support the delay buffer, it returns a config with Enabled set to false. | ||
| func GetDelayBufferConfig(ctx context.Context, sequencerInbox *bridgegen.SequencerInbox) ( | ||
| *DelayBufferConfig, error) { | ||
|
|
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| callOpts := bind.CallOpts{Context: ctx} | ||
| enabled, err := sequencerInbox.IsDelayBufferable(&callOpts) | ||
| if err != nil { | ||
| if headerreader.ExecutionRevertedRegexp.MatchString(err.Error()) { | ||
| return &DelayBufferConfig{Enabled: false}, nil | ||
| } | ||
| return nil, fmt.Errorf("retrieve SequencerInbox.isDelayBufferable: %w", err) | ||
| } | ||
| if !enabled { | ||
| return &DelayBufferConfig{Enabled: false}, nil | ||
| } | ||
| bufferData, err := sequencerInbox.Buffer(&callOpts) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("retrieve SequencerInbox.buffer: %w", err) | ||
| } | ||
| config := &DelayBufferConfig{ | ||
| Enabled: true, | ||
| Threshold: bufferData.Threshold, | ||
| } | ||
| return config, nil | ||
| } | ||
|
|
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| // GenDelayProof generates the delay proof based on batch's first delayed message and the delayed | ||
| // accumulater from the inbox. | ||
| func GenDelayProof(ctx context.Context, message *arbostypes.MessageWithMetadata, inbox *InboxTracker) ( | ||
| *bridgegen.DelayProof, error) { | ||
|
|
||
| if message.DelayedMessagesRead == 0 { | ||
| return nil, fmt.Errorf("BUG: trying to generate delay proof without delayed message") | ||
| } | ||
| seqNum := message.DelayedMessagesRead - 1 | ||
| var beforeDelayedAcc common.Hash | ||
| if seqNum > 0 { | ||
| var err error | ||
| beforeDelayedAcc, err = inbox.GetDelayedAcc(seqNum - 1) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| } | ||
| delayedMessage := bridgegen.MessagesMessage{ | ||
| Kind: message.Message.Header.Kind, | ||
| Sender: message.Message.Header.Poster, | ||
| BlockNumber: message.Message.Header.BlockNumber, | ||
| Timestamp: message.Message.Header.Timestamp, | ||
| InboxSeqNum: new(big.Int).SetUint64(seqNum), | ||
| BaseFeeL1: message.Message.Header.L1BaseFee, | ||
| MessageDataHash: crypto.Keccak256Hash(message.Message.L2msg), | ||
| } | ||
| delayProof := &bridgegen.DelayProof{ | ||
| BeforeDelayedAcc: beforeDelayedAcc, | ||
| DelayedMessage: delayedMessage, | ||
| } | ||
| return delayProof, nil | ||
| } |
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