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meter.go
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meter.go
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package environment
import (
"context"
"github.com/onflow/cadence/runtime/common"
"github.com/onflow/flow-go/fvm/errors"
"github.com/onflow/flow-go/fvm/meter"
"github.com/onflow/flow-go/fvm/storage/state"
)
const (
// [2_000, 3_000) reserved for the FVM
ComputationKindHash = 2001 + iota
ComputationKindVerifySignature
ComputationKindAddAccountKey
ComputationKindAddEncodedAccountKey
ComputationKindAllocateStorageIndex
ComputationKindCreateAccount
ComputationKindEmitEvent
ComputationKindGenerateUUID
ComputationKindGetAccountAvailableBalance
ComputationKindGetAccountBalance
ComputationKindGetAccountContractCode
ComputationKindGetAccountContractNames
ComputationKindGetAccountKey
ComputationKindGetBlockAtHeight
ComputationKindGetCode
ComputationKindGetCurrentBlockHeight
_
ComputationKindGetStorageCapacity
ComputationKindGetStorageUsed
ComputationKindGetValue
ComputationKindRemoveAccountContractCode
ComputationKindResolveLocation
ComputationKindRevokeAccountKey
ComputationKindRevokeEncodedAccountKey
_
ComputationKindSetValue
ComputationKindUpdateAccountContractCode
ComputationKindValidatePublicKey
ComputationKindValueExists
ComputationKindAccountKeysCount
ComputationKindBLSVerifyPOP
ComputationKindBLSAggregateSignatures
ComputationKindBLSAggregatePublicKeys
ComputationKindGetOrLoadProgram
ComputationKindGenerateAccountLocalID
ComputationKindGetRandomSourceHistory
ComputationKindEVMGasUsage
ComputationKindRLPEncoding
ComputationKindRLPDecoding
ComputationKindEncodeEvent
_
ComputationKindEVMEncodeABI
ComputationKindEVMDecodeABI
)
type Meter interface {
MeterComputation(common.ComputationKind, uint) error
ComputationUsed() (uint64, error)
ComputationIntensities() meter.MeteredComputationIntensities
ComputationAvailable(common.ComputationKind, uint) bool
MeterMemory(usage common.MemoryUsage) error
MemoryUsed() (uint64, error)
MeterEmittedEvent(byteSize uint64) error
TotalEmittedEventBytes() uint64
InteractionUsed() (uint64, error)
}
type meterImpl struct {
txnState state.NestedTransactionPreparer
}
func NewMeter(txnState state.NestedTransactionPreparer) Meter {
return &meterImpl{
txnState: txnState,
}
}
func (meter *meterImpl) MeterComputation(
kind common.ComputationKind,
intensity uint,
) error {
return meter.txnState.MeterComputation(kind, intensity)
}
func (meter *meterImpl) ComputationIntensities() meter.MeteredComputationIntensities {
return meter.txnState.ComputationIntensities()
}
func (meter *meterImpl) ComputationAvailable(
kind common.ComputationKind,
intensity uint,
) bool {
return meter.txnState.ComputationAvailable(kind, intensity)
}
func (meter *meterImpl) ComputationUsed() (uint64, error) {
return meter.txnState.TotalComputationUsed(), nil
}
func (meter *meterImpl) MeterMemory(usage common.MemoryUsage) error {
return meter.txnState.MeterMemory(usage.Kind, uint(usage.Amount))
}
func (meter *meterImpl) MemoryUsed() (uint64, error) {
return meter.txnState.TotalMemoryEstimate(), nil
}
func (meter *meterImpl) InteractionUsed() (uint64, error) {
return meter.txnState.InteractionUsed(), nil
}
func (meter *meterImpl) MeterEmittedEvent(byteSize uint64) error {
return meter.txnState.MeterEmittedEvent(byteSize)
}
func (meter *meterImpl) TotalEmittedEventBytes() uint64 {
return meter.txnState.TotalEmittedEventBytes()
}
type cancellableMeter struct {
meterImpl
ctx context.Context
}
func NewCancellableMeter(
ctx context.Context,
txnState state.NestedTransactionPreparer,
) Meter {
return &cancellableMeter{
meterImpl: meterImpl{
txnState: txnState,
},
ctx: ctx,
}
}
func (meter *cancellableMeter) MeterComputation(
kind common.ComputationKind,
intensity uint,
) error {
// this method is called on every unit of operation, so
// checking the context here is the most likely would capture
// timeouts or cancellation as soon as they happen, though
// we might revisit this when optimizing script execution
// by only checking on specific kind of Meter calls.
//
// in the future this context check should be done inside the cadence
select {
case <-meter.ctx.Done():
err := meter.ctx.Err()
if errors.Is(err, context.DeadlineExceeded) {
return errors.NewScriptExecutionTimedOutError()
}
return errors.NewScriptExecutionCancelledError(err)
default:
// do nothing
}
return meter.meterImpl.MeterComputation(kind, intensity)
}