perf(blocksync): verify a commit once, not again as the next block's LastCommit #1427
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| Original file line number | Diff line number | Diff line change |
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@@ -8,8 +8,10 @@ import ( | |
| "encoding/hex" | ||
| "errors" | ||
| "fmt" | ||
| "sync/atomic" | ||
| "time" | ||
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| "github.com/dashpay/dashd-go/btcjson" | ||
| abciclient "github.com/dashpay/tenderdash/abci/client" | ||
| abci "github.com/dashpay/tenderdash/abci/types" | ||
| "github.com/dashpay/tenderdash/crypto" | ||
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@@ -51,6 +53,11 @@ type Executor interface { | |
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| ValidateBlock(ctx context.Context, state State, block *types.Block) error | ||
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| // NoteVerifiedCommit records a commit the caller has just verified against | ||
| // state.Validators, so the executor can skip verifying it a second time when | ||
| // it reappears as the next block's LastCommit. | ||
| NoteVerifiedCommit(state State, blockID types.BlockID, commit *types.Commit) | ||
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| ValidateBlockWithRoundState( | ||
| ctx context.Context, | ||
| state State, | ||
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@@ -108,6 +115,22 @@ type BlockExecutor struct { | |
| // detect non-deterministic prepare proposal responses | ||
| lastRequestPrepareProposalHash []byte | ||
| lastResponsePrepareProposalHash []byte | ||
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| // the commit most recently verified by a caller, so validateBlock can skip | ||
| // re-verifying it when it comes back as the next block's LastCommit | ||
| verifiedCommit atomic.Pointer[verifiedCommit] | ||
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| } | ||
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| // verifiedCommit pins every input ValidatorSet.verifyCommit reads, so a match | ||
| // means a repeat verification would be handed identical arguments. | ||
| type verifiedCommit struct { | ||
| chainID string | ||
| height int64 | ||
| blockID types.BlockID | ||
| quorumType btcjson.LLMQType | ||
| quorumHash crypto.QuorumHash | ||
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| thresholdKey crypto.PubKey | ||
| commit []byte | ||
| } | ||
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| // BlockExecWithLogger is an option function to set a logger to BlockExecutor | ||
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@@ -408,7 +431,7 @@ func (blockExec *BlockExecutor) ValidateBlock(ctx context.Context, state State, | |
| return nil | ||
| } | ||
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| err := validateBlock(state, block, blockExec.lastCommitAlreadyVerified(state, block)) | ||
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Contributor
There was a problem hiding this comment. PR's "consensus is unaffected" claim is false — the memo is read by the consensus path at every blocksync-to-consensus handover. The PR states "Consensus path never calls No signature-verification bypass exists today — every input Recommendation: narrow it structurally rather than just re-documenting it — clear the memo in 🤖 Co-authored by Claudius the Magnificent AI Agent
Member
Author
There was a problem hiding this comment. You are right that the read side is reachable from consensus for one height after the handover, and the PR description overstated it. I have rewritten that section rather than adding the clear-before-switch. I pushed back on the structural fix because I do not think it buys anything. The skip fires only on a full match: same chain ID, height, block ID, quorum type, quorum hash, threshold key and a byte-identical marshalled commit, all captured as owned copies at the moment Clearing it would also need a new interface method or a type assertion in 🤖 Posted autonomously by Claude on behalf of pasta. |
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| if err != nil { | ||
| return err | ||
| } | ||
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@@ -422,6 +445,60 @@ func (blockExec *BlockExecutor) ValidateBlock(ctx context.Context, state State, | |
| return nil | ||
| } | ||
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| // NoteVerifiedCommit records a successful VerifyCommit so the identical | ||
| // verification can be skipped when that commit reappears as the next block's | ||
| // LastCommit. Only the most recent one is kept: block sync applies blocks in | ||
| // order, so it is the only one that can match. | ||
| func (blockExec *BlockExecutor) NoteVerifiedCommit(state State, blockID types.BlockID, commit *types.Commit) { | ||
| if commit == nil || state.Validators == nil { | ||
| return | ||
| } | ||
| encoded, err := commit.ToProto().Marshal() | ||
| if err != nil { | ||
| blockExec.verifiedCommit.Store(nil) | ||
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| return | ||
| } | ||
| blockExec.verifiedCommit.Store(&verifiedCommit{ | ||
| chainID: state.ChainID, | ||
| height: commit.Height, | ||
| blockID: blockID, | ||
| quorumType: state.Validators.QuorumType, | ||
| quorumHash: state.Validators.QuorumHash, | ||
| thresholdKey: state.Validators.ThresholdPublicKey, | ||
| commit: encoded, | ||
| }) | ||
| } | ||
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| // lastCommitAlreadyVerified reports whether block.LastCommit was already | ||
| // verified against exactly the inputs validateBlock would use: same chain, | ||
| // height, block ID, quorum and threshold key, and a byte-identical commit. | ||
| // Anything short of a full match falls through to a real verification. | ||
| func (blockExec *BlockExecutor) lastCommitAlreadyVerified(state State, block *types.Block) bool { | ||
| vc := blockExec.verifiedCommit.Load() | ||
| if vc == nil || block.LastCommit == nil || state.LastValidators == nil { | ||
| return false | ||
| } | ||
| if vc.chainID != state.ChainID || vc.height != block.Height-1 { | ||
| return false | ||
| } | ||
| if !vc.blockID.Equals(state.LastBlockID) { | ||
| return false | ||
| } | ||
| if vc.quorumType != state.LastValidators.QuorumType || | ||
| !vc.quorumHash.Equal(state.LastValidators.QuorumHash) { | ||
| return false | ||
| } | ||
| if vc.thresholdKey == nil || state.LastValidators.ThresholdPublicKey == nil || | ||
| !vc.thresholdKey.Equals(state.LastValidators.ThresholdPublicKey) { | ||
| return false | ||
| } | ||
| got, err := block.LastCommit.ToProto().Marshal() | ||
| if err != nil { | ||
| return false | ||
| } | ||
| return bytes.Equal(vc.commit, got) | ||
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| } | ||
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| func (blockExec *BlockExecutor) ValidateBlockWithRoundState( | ||
| ctx context.Context, | ||
| state State, | ||
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@@ -450,7 +527,14 @@ func (blockExec *BlockExecutor) ValidateBlockWithRoundState( | |
| ) | ||
| } | ||
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| // ValidateBlock above normally verifies block.LastCommit, but it short-circuits | ||
| // on its per-height cache, which is keyed on the block hash alone and so says | ||
| // nothing about the state the earlier validation ran against. That is why this | ||
| // second verification exists. Skip it only when the memo proves this exact | ||
| // commit was already verified against these exact inputs — same chain, height, | ||
| // block ID, quorum, threshold key and byte-identical commit — which is a | ||
| // property of the data rather than of the cache. | ||
| if block.Height > state.InitialHeight && !blockExec.lastCommitAlreadyVerified(state, block) { | ||
| if err := state.LastValidators.VerifyCommit( | ||
| state.ChainID, state.LastBlockID, block.Height-1, block.LastCommit); err != nil { | ||
| return fmt.Errorf("error validating block: %w", err) | ||
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