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result_collector.go
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result_collector.go
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package computer
import (
"context"
"fmt"
"sync"
"time"
otelTrace "go.opentelemetry.io/otel/trace"
"github.com/onflow/flow-go/crypto"
"github.com/onflow/flow-go/crypto/hash"
"github.com/onflow/flow-go/engine/execution"
"github.com/onflow/flow-go/engine/execution/computation/result"
"github.com/onflow/flow-go/engine/execution/storehouse"
"github.com/onflow/flow-go/fvm"
"github.com/onflow/flow-go/fvm/meter"
"github.com/onflow/flow-go/fvm/storage/snapshot"
"github.com/onflow/flow-go/fvm/storage/state"
"github.com/onflow/flow-go/ledger"
"github.com/onflow/flow-go/model/flow"
"github.com/onflow/flow-go/module"
"github.com/onflow/flow-go/module/executiondatasync/execution_data"
"github.com/onflow/flow-go/module/executiondatasync/provider"
"github.com/onflow/flow-go/module/mempool/entity"
"github.com/onflow/flow-go/module/trace"
)
// ViewCommitter commits execution snapshot to the ledger and collects
// the proofs
type ViewCommitter interface {
// CommitView commits an execution snapshot and collects proofs
CommitView(
*snapshot.ExecutionSnapshot,
execution.ExtendableStorageSnapshot,
) (
flow.StateCommitment, // TODO(leo): deprecate. see storehouse.ExtendableStorageSnapshot.Commitment()
[]byte,
*ledger.TrieUpdate,
execution.ExtendableStorageSnapshot,
error,
)
}
type transactionResult struct {
TransactionRequest
*snapshot.ExecutionSnapshot
fvm.ProcedureOutput
timeSpent time.Duration
numConflictRetries int
}
// TODO(ramtin): move committer and other folks to consumers layer
type resultCollector struct {
tracer module.Tracer
blockSpan otelTrace.Span
metrics module.ExecutionMetrics
closeOnce sync.Once
processorInputChan chan transactionResult
processorDoneChan chan struct{}
processorError error
committer ViewCommitter
signer module.Local
spockHasher hash.Hasher
receiptHasher hash.Hasher
executionDataProvider provider.Provider
parentBlockExecutionResultID flow.Identifier
result *execution.ComputationResult
consumers []result.ExecutedCollectionConsumer
spockSignatures []crypto.Signature
blockStartTime time.Time
blockStats module.ExecutionResultStats
blockMeter *meter.Meter
currentCollectionStartTime time.Time
currentCollectionState *state.ExecutionState
currentCollectionStats module.ExecutionResultStats
currentCollectionStorageSnapshot execution.ExtendableStorageSnapshot
}
func newResultCollector(
tracer module.Tracer,
blockSpan otelTrace.Span,
metrics module.ExecutionMetrics,
committer ViewCommitter,
signer module.Local,
executionDataProvider provider.Provider,
spockHasher hash.Hasher,
receiptHasher hash.Hasher,
parentBlockExecutionResultID flow.Identifier,
block *entity.ExecutableBlock,
numTransactions int,
consumers []result.ExecutedCollectionConsumer,
previousBlockSnapshot snapshot.StorageSnapshot,
) *resultCollector {
numCollections := len(block.Collections()) + 1
now := time.Now()
collector := &resultCollector{
tracer: tracer,
blockSpan: blockSpan,
metrics: metrics,
processorInputChan: make(chan transactionResult, numTransactions),
processorDoneChan: make(chan struct{}),
committer: committer,
signer: signer,
spockHasher: spockHasher,
receiptHasher: receiptHasher,
executionDataProvider: executionDataProvider,
parentBlockExecutionResultID: parentBlockExecutionResultID,
result: execution.NewEmptyComputationResult(block),
consumers: consumers,
spockSignatures: make([]crypto.Signature, 0, numCollections),
blockStartTime: now,
blockMeter: meter.NewMeter(meter.DefaultParameters()),
currentCollectionStartTime: now,
currentCollectionState: state.NewExecutionState(nil, state.DefaultParameters()),
currentCollectionStats: module.ExecutionResultStats{
NumberOfCollections: 1,
},
currentCollectionStorageSnapshot: storehouse.NewExecutingBlockSnapshot(
previousBlockSnapshot,
*block.StartState,
),
}
go collector.runResultProcessor()
return collector
}
func (collector *resultCollector) commitCollection(
collection collectionInfo,
startTime time.Time,
collectionExecutionSnapshot *snapshot.ExecutionSnapshot,
) error {
defer collector.tracer.StartSpanFromParent(
collector.blockSpan,
trace.EXECommitDelta).End()
startState := collector.currentCollectionStorageSnapshot.Commitment()
_, proof, trieUpdate, newSnapshot, err := collector.committer.CommitView(
collectionExecutionSnapshot,
collector.currentCollectionStorageSnapshot,
)
if err != nil {
return fmt.Errorf("commit view failed: %w", err)
}
endState := newSnapshot.Commitment()
collector.currentCollectionStorageSnapshot = newSnapshot
execColRes := collector.result.CollectionExecutionResultAt(collection.collectionIndex)
execColRes.UpdateExecutionSnapshot(collectionExecutionSnapshot)
events := execColRes.Events()
eventsHash, err := flow.EventsMerkleRootHash(events)
if err != nil {
return fmt.Errorf("hash events failed: %w", err)
}
txResults := execColRes.TransactionResults()
convertedTxResults := execution_data.ConvertTransactionResults(txResults)
col := collection.Collection()
chunkExecData := &execution_data.ChunkExecutionData{
Collection: &col,
Events: events,
TrieUpdate: trieUpdate,
TransactionResults: convertedTxResults,
}
collector.result.AppendCollectionAttestationResult(
startState,
endState,
proof,
eventsHash,
chunkExecData,
)
collector.metrics.ExecutionChunkDataPackGenerated(
len(proof),
len(collection.Transactions))
spock, err := collector.signer.SignFunc(
collectionExecutionSnapshot.SpockSecret,
collector.spockHasher,
crypto.SPOCKProve)
if err != nil {
return fmt.Errorf("signing spock hash failed: %w", err)
}
collector.spockSignatures = append(collector.spockSignatures, spock)
collector.currentCollectionStats.EventCounts = len(events)
collector.currentCollectionStats.EventSize = events.ByteSize()
collector.currentCollectionStats.NumberOfRegistersTouched = len(
collectionExecutionSnapshot.AllRegisterIDs())
for _, entry := range collectionExecutionSnapshot.UpdatedRegisters() {
collector.currentCollectionStats.NumberOfBytesWrittenToRegisters += len(
entry.Value)
}
collector.metrics.ExecutionCollectionExecuted(
time.Since(startTime),
collector.currentCollectionStats)
collector.blockStats.Merge(collector.currentCollectionStats)
collector.blockMeter.MergeMeter(collectionExecutionSnapshot.Meter)
collector.currentCollectionStartTime = time.Now()
collector.currentCollectionState = state.NewExecutionState(nil, state.DefaultParameters())
collector.currentCollectionStats = module.ExecutionResultStats{
NumberOfCollections: 1,
}
for _, consumer := range collector.consumers {
err = consumer.OnExecutedCollection(collector.result.CollectionExecutionResultAt(collection.collectionIndex))
if err != nil {
return fmt.Errorf("consumer failed: %w", err)
}
}
return nil
}
func (collector *resultCollector) processTransactionResult(
txn TransactionRequest,
txnExecutionSnapshot *snapshot.ExecutionSnapshot,
output fvm.ProcedureOutput,
timeSpent time.Duration,
numConflictRetries int,
) error {
logger := txn.ctx.Logger.With().
Uint64("computation_used", output.ComputationUsed).
Uint64("memory_used", output.MemoryEstimate).
Int64("time_spent_in_ms", timeSpent.Milliseconds()).
Logger()
if output.Err != nil {
logger = logger.With().
Str("error_message", output.Err.Error()).
Uint16("error_code", uint16(output.Err.Code())).
Logger()
logger.Info().Msg("transaction execution failed")
if txn.isSystemTransaction {
// This log is used as the data source for an alert on grafana.
// The system_chunk_error field must not be changed without adding
// the corresponding changes in grafana.
// https://github.com/dapperlabs/flow-internal/issues/1546
logger.Error().
Bool("system_chunk_error", true).
Bool("system_transaction_error", true).
Bool("critical_error", true).
Msg("error executing system chunk transaction")
}
} else {
logger.Info().Msg("transaction executed successfully")
}
collector.metrics.ExecutionTransactionExecuted(
timeSpent,
numConflictRetries,
output.ComputationUsed,
output.MemoryEstimate,
len(output.Events),
flow.EventsList(output.Events).ByteSize(),
output.Err != nil,
)
txnResult := flow.TransactionResult{
TransactionID: txn.ID,
ComputationUsed: output.ComputationUsed,
MemoryUsed: output.MemoryEstimate,
}
if output.Err != nil {
txnResult.ErrorMessage = output.Err.Error()
}
collector.result.
CollectionExecutionResultAt(txn.collectionIndex).
AppendTransactionResults(
output.Events,
output.ServiceEvents,
output.ConvertedServiceEvents,
txnResult,
)
err := collector.currentCollectionState.Merge(txnExecutionSnapshot)
if err != nil {
return fmt.Errorf("failed to merge into collection view: %w", err)
}
collector.currentCollectionStats.ComputationUsed += output.ComputationUsed
collector.currentCollectionStats.MemoryUsed += output.MemoryEstimate
collector.currentCollectionStats.NumberOfTransactions += 1
if !txn.lastTransactionInCollection {
return nil
}
return collector.commitCollection(
txn.collectionInfo,
collector.currentCollectionStartTime,
collector.currentCollectionState.Finalize())
}
func (collector *resultCollector) AddTransactionResult(
request TransactionRequest,
snapshot *snapshot.ExecutionSnapshot,
output fvm.ProcedureOutput,
timeSpent time.Duration,
numConflictRetries int,
) {
result := transactionResult{
TransactionRequest: request,
ExecutionSnapshot: snapshot,
ProcedureOutput: output,
timeSpent: timeSpent,
numConflictRetries: numConflictRetries,
}
select {
case collector.processorInputChan <- result:
// Do nothing
case <-collector.processorDoneChan:
// Processor exited (probably due to an error)
}
}
func (collector *resultCollector) runResultProcessor() {
defer close(collector.processorDoneChan)
for result := range collector.processorInputChan {
err := collector.processTransactionResult(
result.TransactionRequest,
result.ExecutionSnapshot,
result.ProcedureOutput,
result.timeSpent,
result.numConflictRetries)
if err != nil {
collector.processorError = err
return
}
}
}
func (collector *resultCollector) Stop() {
collector.closeOnce.Do(func() {
close(collector.processorInputChan)
})
}
func (collector *resultCollector) Finalize(
ctx context.Context,
) (
*execution.ComputationResult,
error,
) {
collector.Stop()
<-collector.processorDoneChan
if collector.processorError != nil {
return nil, collector.processorError
}
executionDataID, executionDataRoot, err := collector.executionDataProvider.Provide(
ctx,
collector.result.Height(),
collector.result.BlockExecutionData)
if err != nil {
return nil, fmt.Errorf("failed to provide execution data: %w", err)
}
executionResult := flow.NewExecutionResult(
collector.parentBlockExecutionResultID,
collector.result.ExecutableBlock.ID(),
collector.result.AllChunks(),
collector.result.AllConvertedServiceEvents(),
executionDataID)
executionReceipt, err := GenerateExecutionReceipt(
collector.signer,
collector.receiptHasher,
executionResult,
collector.spockSignatures)
if err != nil {
return nil, fmt.Errorf("could not sign execution result: %w", err)
}
collector.result.ExecutionReceipt = executionReceipt
collector.result.ExecutionDataRoot = executionDataRoot
collector.metrics.ExecutionBlockExecuted(
time.Since(collector.blockStartTime),
collector.blockStats)
for kind, intensity := range collector.blockMeter.ComputationIntensities() {
collector.metrics.ExecutionBlockExecutionEffortVectorComponent(
kind.String(),
intensity)
}
return collector.result, nil
}
func GenerateExecutionReceipt(
signer module.Local,
receiptHasher hash.Hasher,
result *flow.ExecutionResult,
spockSignatures []crypto.Signature,
) (
*flow.ExecutionReceipt,
error,
) {
receipt := &flow.ExecutionReceipt{
ExecutionResult: *result,
Spocks: spockSignatures,
ExecutorSignature: crypto.Signature{},
ExecutorID: signer.NodeID(),
}
// generates a signature over the execution result
id := receipt.ID()
sig, err := signer.Sign(id[:], receiptHasher)
if err != nil {
return nil, fmt.Errorf("could not sign execution result: %w", err)
}
receipt.ExecutorSignature = sig
return receipt, nil
}