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epoch.go
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epoch.go
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package inmem
import (
"fmt"
"github.com/onflow/flow-go/model/encodable"
"github.com/onflow/flow-go/model/flow"
"github.com/onflow/flow-go/model/flow/factory"
"github.com/onflow/flow-go/model/flow/filter"
"github.com/onflow/flow-go/module/signature"
"github.com/onflow/flow-go/state/cluster"
"github.com/onflow/flow-go/state/protocol"
"github.com/onflow/flow-go/state/protocol/invalid"
)
// Epoch is a memory-backed implementation of protocol.Epoch.
type Epoch struct {
enc EncodableEpoch
}
var _ protocol.Epoch = (*Epoch)(nil)
func (e Epoch) Encodable() EncodableEpoch {
return e.enc
}
func (e Epoch) Counter() (uint64, error) { return e.enc.Counter, nil }
func (e Epoch) FirstView() (uint64, error) { return e.enc.FirstView, nil }
func (e Epoch) DKGPhase1FinalView() (uint64, error) { return e.enc.DKGPhase1FinalView, nil }
func (e Epoch) DKGPhase2FinalView() (uint64, error) { return e.enc.DKGPhase2FinalView, nil }
func (e Epoch) DKGPhase3FinalView() (uint64, error) { return e.enc.DKGPhase3FinalView, nil }
func (e Epoch) FinalView() (uint64, error) { return e.enc.FinalView, nil }
func (e Epoch) InitialIdentities() (flow.IdentityList, error) {
return e.enc.InitialIdentities, nil
}
func (e Epoch) RandomSource() ([]byte, error) {
return e.enc.RandomSource, nil
}
func (e Epoch) Clustering() (flow.ClusterList, error) {
return e.enc.Clustering, nil
}
func (e Epoch) DKG() (protocol.DKG, error) {
if e.enc.DKG != nil {
return DKG{*e.enc.DKG}, nil
}
return nil, protocol.ErrNextEpochNotCommitted
}
func (e Epoch) Cluster(i uint) (protocol.Cluster, error) {
if e.enc.Clusters == nil {
return nil, protocol.ErrNextEpochNotCommitted
}
if i >= uint(len(e.enc.Clusters)) {
return nil, fmt.Errorf("no cluster with index %d: %w", i, protocol.ErrClusterNotFound)
}
return Cluster{e.enc.Clusters[i]}, nil
}
func (e Epoch) ClusterByChainID(chainID flow.ChainID) (protocol.Cluster, error) {
if e.enc.Clusters == nil {
return nil, protocol.ErrNextEpochNotCommitted
}
for _, cluster := range e.enc.Clusters {
if cluster.RootBlock.Header.ChainID == chainID {
return Cluster{cluster}, nil
}
}
chainIDs := make([]string, 0, len(e.enc.Clusters))
for _, cluster := range e.enc.Clusters {
chainIDs = append(chainIDs, string(cluster.RootBlock.Header.ChainID))
}
return nil, fmt.Errorf("no cluster with the given chain ID %v, available chainIDs %v: %w", chainID, chainIDs, protocol.ErrClusterNotFound)
}
func (e Epoch) FinalHeight() (uint64, error) {
if e.enc.FinalHeight != nil {
return *e.enc.FinalHeight, nil
}
return 0, protocol.ErrEpochTransitionNotFinalized
}
func (e Epoch) FirstHeight() (uint64, error) {
if e.enc.FirstHeight != nil {
return *e.enc.FirstHeight, nil
}
return 0, protocol.ErrEpochTransitionNotFinalized
}
type Epochs struct {
enc EncodableEpochs
}
var _ protocol.EpochQuery = (*Epochs)(nil)
func (eq Epochs) Previous() protocol.Epoch {
if eq.enc.Previous != nil {
return Epoch{*eq.enc.Previous}
}
return invalid.NewEpoch(protocol.ErrNoPreviousEpoch)
}
func (eq Epochs) Current() protocol.Epoch {
return Epoch{eq.enc.Current}
}
func (eq Epochs) Next() protocol.Epoch {
if eq.enc.Next != nil {
return Epoch{*eq.enc.Next}
}
return invalid.NewEpoch(protocol.ErrNextEpochNotSetup)
}
// setupEpoch is an implementation of protocol.Epoch backed by an EpochSetup
// service event. This is used for converting service events to inmem.Epoch.
type setupEpoch struct {
// EpochSetup service event
setupEvent *flow.EpochSetup
}
func (es *setupEpoch) Counter() (uint64, error) {
return es.setupEvent.Counter, nil
}
func (es *setupEpoch) FirstView() (uint64, error) {
return es.setupEvent.FirstView, nil
}
func (es *setupEpoch) DKGPhase1FinalView() (uint64, error) {
return es.setupEvent.DKGPhase1FinalView, nil
}
func (es *setupEpoch) DKGPhase2FinalView() (uint64, error) {
return es.setupEvent.DKGPhase2FinalView, nil
}
func (es *setupEpoch) DKGPhase3FinalView() (uint64, error) {
return es.setupEvent.DKGPhase3FinalView, nil
}
func (es *setupEpoch) FinalView() (uint64, error) {
return es.setupEvent.FinalView, nil
}
func (es *setupEpoch) RandomSource() ([]byte, error) {
return es.setupEvent.RandomSource, nil
}
func (es *setupEpoch) InitialIdentities() (flow.IdentityList, error) {
identities := es.setupEvent.Participants.Filter(filter.Any)
return identities, nil
}
func (es *setupEpoch) Clustering() (flow.ClusterList, error) {
return ClusteringFromSetupEvent(es.setupEvent)
}
func ClusteringFromSetupEvent(setupEvent *flow.EpochSetup) (flow.ClusterList, error) {
collectorFilter := filter.HasRole(flow.RoleCollection)
clustering, err := factory.NewClusterList(setupEvent.Assignments, setupEvent.Participants.Filter(collectorFilter))
if err != nil {
return nil, fmt.Errorf("failed to generate ClusterList from collector identities: %w", err)
}
return clustering, nil
}
func (es *setupEpoch) Cluster(_ uint) (protocol.Cluster, error) {
return nil, protocol.ErrNextEpochNotCommitted
}
func (es *setupEpoch) ClusterByChainID(_ flow.ChainID) (protocol.Cluster, error) {
return nil, protocol.ErrNextEpochNotCommitted
}
func (es *setupEpoch) DKG() (protocol.DKG, error) {
return nil, protocol.ErrNextEpochNotCommitted
}
func (es *setupEpoch) FirstHeight() (uint64, error) {
return 0, protocol.ErrEpochTransitionNotFinalized
}
func (es *setupEpoch) FinalHeight() (uint64, error) {
return 0, protocol.ErrEpochTransitionNotFinalized
}
// committedEpoch is an implementation of protocol.Epoch backed by an EpochSetup
// and EpochCommit service event. This is used for converting service events to
// inmem.Epoch.
type committedEpoch struct {
setupEpoch
commitEvent *flow.EpochCommit
}
func (es *committedEpoch) Cluster(index uint) (protocol.Cluster, error) {
epochCounter := es.setupEvent.Counter
clustering, err := es.Clustering()
if err != nil {
return nil, fmt.Errorf("failed to generate clustering: %w", err)
}
members, ok := clustering.ByIndex(index)
if !ok {
return nil, fmt.Errorf("no cluster with index %d: %w", index, protocol.ErrClusterNotFound)
}
qcs := es.commitEvent.ClusterQCs
if uint(len(qcs)) <= index {
return nil, fmt.Errorf("internal data inconsistency: cannot get qc at index %d - epoch has %d clusters and %d cluster QCs",
index, len(clustering), len(qcs))
}
rootQCVoteData := qcs[index]
signerIndices, err := signature.EncodeSignersToIndices(members.NodeIDs(), rootQCVoteData.VoterIDs)
if err != nil {
return nil, fmt.Errorf("could not encode signer indices for rootQCVoteData.VoterIDs: %w", err)
}
rootBlock := cluster.CanonicalRootBlock(epochCounter, members)
rootQC := &flow.QuorumCertificate{
View: rootBlock.Header.View,
BlockID: rootBlock.ID(),
SignerIndices: signerIndices,
SigData: rootQCVoteData.SigData,
}
cluster, err := ClusterFromEncodable(EncodableCluster{
Index: index,
Counter: epochCounter,
Members: members,
RootBlock: rootBlock,
RootQC: rootQC,
})
return cluster, err
}
func (es *committedEpoch) ClusterByChainID(chainID flow.ChainID) (protocol.Cluster, error) {
clustering, err := es.Clustering()
if err != nil {
return nil, fmt.Errorf("failed to generate clustering: %w", err)
}
for i, cl := range clustering {
if cluster.CanonicalClusterID(es.setupEvent.Counter, cl.NodeIDs()) == chainID {
cl, err := es.Cluster(uint(i))
if err != nil {
return nil, fmt.Errorf("could not retrieve known existing cluster (idx=%d, id=%s): %v", i, chainID, err)
}
return cl, nil
}
}
return nil, protocol.ErrClusterNotFound
}
func (es *committedEpoch) DKG() (protocol.DKG, error) {
// filter initial participants to valid DKG participants
participants := es.setupEvent.Participants.Filter(filter.IsValidDKGParticipant)
lookup, err := flow.ToDKGParticipantLookup(participants, es.commitEvent.DKGParticipantKeys)
if err != nil {
return nil, fmt.Errorf("could not construct dkg lookup: %w", err)
}
dkg, err := DKGFromEncodable(EncodableDKG{
GroupKey: encodable.RandomBeaconPubKey{
PublicKey: es.commitEvent.DKGGroupKey,
},
Participants: lookup,
})
return dkg, err
}
// startedEpoch represents an epoch (with counter N) that has started, but there is no _finalized_ transition
// to the next epoch yet. Note that nodes can already be in views belonging to the _next_ Epoch, and it is
// possible that there are already unfinalized blocks in that next epoch. However, without finalized blocks
// in Epoch N+1, there is no definition of "last block" for Epoch N.
//
// startedEpoch has all the information of a committedEpoch, plus the epoch's first block height.
type startedEpoch struct {
committedEpoch
firstHeight uint64
}
func (e *startedEpoch) FirstHeight() (uint64, error) {
return e.firstHeight, nil
}
// endedEpoch is an epoch which has ended (ie. the previous epoch). It has all the
// information of a startedEpoch, plus the epoch's final block height.
type endedEpoch struct {
startedEpoch
finalHeight uint64
}
func (e *endedEpoch) FinalHeight() (uint64, error) {
return e.finalHeight, nil
}
// NewSetupEpoch returns a memory-backed epoch implementation based on an
// EpochSetup event. Epoch information available after the setup phase will
// not be accessible in the resulting epoch instance.
// No errors are expected during normal operations.
func NewSetupEpoch(setupEvent *flow.EpochSetup) protocol.Epoch {
return &setupEpoch{
setupEvent: setupEvent,
}
}
// NewCommittedEpoch returns a memory-backed epoch implementation based on an
// EpochSetup and EpochCommit events.
// No errors are expected during normal operations.
func NewCommittedEpoch(setupEvent *flow.EpochSetup, commitEvent *flow.EpochCommit) protocol.Epoch {
return &committedEpoch{
setupEpoch: setupEpoch{
setupEvent: setupEvent,
},
commitEvent: commitEvent,
}
}
// NewStartedEpoch returns a memory-backed epoch implementation based on an
// EpochSetup and EpochCommit events, and the epoch's first block height.
// No errors are expected during normal operations.
func NewStartedEpoch(setupEvent *flow.EpochSetup, commitEvent *flow.EpochCommit, firstHeight uint64) protocol.Epoch {
return &startedEpoch{
committedEpoch: committedEpoch{
setupEpoch: setupEpoch{
setupEvent: setupEvent,
},
commitEvent: commitEvent,
},
firstHeight: firstHeight,
}
}
// NewEndedEpoch returns a memory-backed epoch implementation based on an
// EpochSetup and EpochCommit events, and the epoch's final block height.
// No errors are expected during normal operations.
func NewEndedEpoch(setupEvent *flow.EpochSetup, commitEvent *flow.EpochCommit, firstHeight, finalHeight uint64) protocol.Epoch {
return &endedEpoch{
startedEpoch: startedEpoch{
committedEpoch: committedEpoch{
setupEpoch: setupEpoch{
setupEvent: setupEvent,
},
commitEvent: commitEvent,
},
firstHeight: firstHeight,
},
finalHeight: finalHeight,
}
}