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block_producer.go
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/
block_producer.go
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package blockproducer
import (
"fmt"
"github.com/onflow/flow-go/consensus/hotstuff"
"github.com/onflow/flow-go/consensus/hotstuff/model"
"github.com/onflow/flow-go/model/flow"
"github.com/onflow/flow-go/module"
)
// BlockProducer is responsible for producing new block proposals
type BlockProducer struct {
signer hotstuff.SignerVerifier
committee hotstuff.Committee
builder module.Builder
}
// New creates a new BlockProducer which wraps the chain compliance layer block builder
// to provide hotstuff with block proposals.
func New(signer hotstuff.SignerVerifier, committee hotstuff.Committee, builder module.Builder) (*BlockProducer, error) {
bp := &BlockProducer{
signer: signer,
committee: committee,
builder: builder,
}
return bp, nil
}
// MakeBlockProposal will build a proposal for the given view with the given QC
func (bp *BlockProducer) MakeBlockProposal(qc *flow.QuorumCertificate, view uint64) (*model.Proposal, error) {
// the custom functions allows us to set some custom fields on the block;
// in hotstuff, we use this for view number and signature-related fields
setHotstuffFields := func(header *flow.Header) error {
header.View = view
header.ParentVoterIDs = qc.SignerIDs
header.ParentVoterSigData = qc.SigData
header.ProposerID = bp.committee.Self()
// turn the header into a block header proposal as known by hotstuff
block := model.Block{
BlockID: header.ID(),
View: view,
ProposerID: header.ProposerID,
QC: qc,
PayloadHash: header.PayloadHash,
Timestamp: header.Timestamp,
}
// then sign the proposal
proposal, err := bp.signer.CreateProposal(&block)
if err != nil {
return fmt.Errorf("could not sign block proposal: %w", err)
}
header.ProposerSigData = proposal.SigData
return nil
}
// retrieve a fully built block header from the builder
header, err := bp.builder.BuildOn(qc.BlockID, setHotstuffFields)
if err != nil {
return nil, fmt.Errorf("could not build block proposal on top of %v: %w", qc.BlockID, err)
}
// turn the signed flow header into a proposal
proposal := model.ProposalFromFlow(header, qc.View)
return proposal, nil
}