fvm

package
v0.28.11 Latest Latest
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 Go to latest Published: Nov 5, 2022 License: AGPL-3.0 Imports: 27 Imported by: 24

README

Flow Virtual Machine (FVM)

The Flow Virtual Machine (FVM) augments the Cadence runtime with the domain-specific functionality required by the Flow protocol.

Usage

Quickstart
import (
    "github.com/onflow/cadence/runtime"
    "github.com/onflow/flow-go/fvm"
    "github.com/onflow/flow-go/fvm/state"
    "github.com/onflow/flow-go/model/flow"
)

vm := fvm.New(runtime.NewInterpreterRuntime())

tx := flow.NewTransactionBody().
    SetScript([]byte(`transaction { execute { log("Hello, World!") } }`))

ctx := fvm.NewContext()
ledger := state.NewMapLedger()

txIndex := uint32(0)
txProc := fvm.Transaction(tx, txIndex)

err := vm.Run(ctx, txProc, ledger)
if err != nil {
  panic("fatal error during transaction procedure!")
}

fmt.Println(txProc.Logs[0]) // prints "Hello, World!"
Procedure

The FVM interacts with the Flow execution state by running atomic procedures against a shared ledger. A Procedure is an operation that can be applied to a Ledger.

Procedure Types
Transactions (Read/write)

A TransactionProcedure is an operation that mutates the ledger state.

A transaction procedure can be created from a flow.TransactionBody:

var tx flow.TransactionBody
var txIndex uint32

i := fvm.Transaction(tx, txIndex)

A transaction procedure has the following steps:

  1. Verify all transaction signatures against the current ledger state
  2. Validate and increment the proposal key sequence number
  3. Deduct transaction fee from the payer account
  4. Invoke transaction script with provided arguments and authorizers
Scripts (Read-only)

A ScriptProcedure is an operation that reads from the ledger state.

foo := fvm.Script([]byte(`fun main(): Int { return 42 }`))

A script can have optionally bound arguments:

script := fvm.Script([]byte(`fun main(x: Int): Int { x * 2 }`))

foo := script.WithArguments(argA)
bar := script.WithArguments(argB)
Contexts

The VM runs procedures inside of an execution context that defines the host functionality provided to the Cadence runtime. A Context instance is an immutable object, and any changes to a context must be made by spawning a new child context.

vm := fvm.New(runtime.NewInterpreterRuntime())

globalCtx := fvm.NewContext()

// create separate contexts for different blocks
block1Ctx := fvm.NewContextFromParent(globalCtx, fvm.WithBlockHeader(block1))
block2Ctx := fvm.NewContextFromParent(globalCtx, fvm.WithBlockHeader(block2))

// contexts can be safely used in parallel
go executeBlock(vm, block1Ctx)
go executeBlock(vm, block2Ctx)
Context Options

TODO: document context options

Design

The structure of the FVM package is intended to promote the following:

  • Determinism: the VM should be consistent and predictable, producing identical results given the same inputs.
  • Performance: the VM should expose functionality that allows the caller to exploit parallelism and pre-computation.
  • Flexibility: the VM should support a variety of use cases including not only execution and verification, but also developer tooling and network emulation.
Context

A Context is a reusable component that simply defines the parameters of an execution environment. For example, all transactions within the same block would share a common Context configured with the relevant block data.

Contexts can be arbitrarily nested. A child context inherits the parameters of its parent, but is free to override any parameters that it chooses.

HostEnvironment

A HostEnvironment is a short-lived component that is consumed by a procedure. A HostEnvironment is the interface through which the VM communicates with the Cadence runtime. The HostEnvironment provides information about the current Context and also collects logs, events and metrics emitted from the runtime.

Procedure Lifecycle

The diagram below illustrates the relationship between contexts, host environments and procedures. Multiple procedures can reuse the same context, each of which is supplied with a unique HostEnvironment instance.

fvm

TODO

  • Improve error handling
  • Create list of all missing test cases
  • Implement missing test cases
  • Documentation
    • Transaction validation (signatures, sequence numbers)
    • Fee payments
    • Address generation
    • Account management
    • Bootstrapping
    • Ledger usage

Open Questions

  • Currently the caller is responsible for providing the correct Ledger instance when running a procedure. When performing atomic operations in batches (i.e blocks or chunks), multiple ledgers are spawned in a hierarchy similar to that of multiple Context instances. Does it make sense for the fvm package to manage ledgers as well?

Documentation

Index

Constants

View Source 
const (
	DefaultComputationLimit = 100_000        // 100K
	DefaultMemoryLimit      = math.MaxUint64 //
)
View Source 
const (
	BootstrapProcedureType   = ProcedureType("bootstrap")
	TransactionProcedureType = ProcedureType("transaction")
	ScriptProcedureType      = ProcedureType("script")
)
View Source 
const AccountKeyWeightThreshold = 1000

Variables

View Source 
var DefaultAccountCreationFee = func() cadence.UFix64 {
	value, err := cadence.NewUFix64("0.00100000")
	if err != nil {
		panic(fmt.Errorf("invalid default account creation fee: %w", err))
	}
	return value
}()
View Source 
var DefaultMinimumStorageReservation = func() cadence.UFix64 {
	value, err := cadence.NewUFix64("0.00100000")
	if err != nil {
		panic(fmt.Errorf("invalid default minimum storage reservation: %w", err))
	}
	return value
}()
View Source 
var DefaultStorageMBPerFLOW = func() cadence.UFix64 {
	value, err := cadence.NewUFix64("100.00000000")
	if err != nil {
		panic(fmt.Errorf("invalid default minimum storage reservation: %w", err))
	}
	return value
}()
View Source 
var DefaultTransactionFees = func() BootstrapProcedureFeeParameters {
	surgeFactor, err := cadence.NewUFix64("1.0")
	if err != nil {
		panic(fmt.Errorf("invalid default fee surge factor: %w", err))
	}
	inclusionEffortCost, err := cadence.NewUFix64("0.00001")
	if err != nil {
		panic(fmt.Errorf("invalid default fee effort cost: %w", err))
	}
	executionEffortCost, err := cadence.NewUFix64("0.0")
	if err != nil {
		panic(fmt.Errorf("invalid default fee effort cost: %w", err))
	}
	return BootstrapProcedureFeeParameters{
		SurgeFactor:         surgeFactor,
		InclusionEffortCost: inclusionEffortCost,
		ExecutionEffortCost: executionEffortCost,
	}
}()

DefaultTransactionFees are the default transaction fee parameters if transaction fees are on. surge factor is 1.0, inclusion effort cost is 0.0001 (because the static inclusion effort is 1.0) and execution effort cost is 0.0 because dynamic execution fees are off If they are off (which is the default behaviour) that means the transaction fees are 0.0.

Functions

func FlowTokenAddress 

func FlowTokenAddress(chain flow.Chain) flow.Address

func FungibleTokenAddress 

func FungibleTokenAddress(chain flow.Chain) flow.Address

func GetExecutionEffortWeights added in v0.27.0 

func GetExecutionEffortWeights(
	env environment.Environment,
	service runtime.Address,
) (
	computationWeights meter.ExecutionEffortWeights,
	err error,
)

GetExecutionEffortWeights reads stored execution effort weights from the service account

func GetExecutionMemoryLimit added in v0.27.0 

func GetExecutionMemoryLimit(
	env environment.Environment,
	service runtime.Address,
) (
	memoryLimit uint64,
	err error,
)

GetExecutionMemoryLimit reads the stored execution memory limit from the service account

func GetExecutionMemoryWeights added in v0.27.0 

func GetExecutionMemoryWeights(
	env environment.Environment,
	service runtime.Address,
) (
	memoryWeights meter.ExecutionMemoryWeights,
	err error,
)

GetExecutionMemoryWeights reads stored execution memory weights from the service account

func NewInterpreterRuntime added in v0.15.1 

func NewInterpreterRuntime(config runtime.Config) runtime.Runtime

func NewScriptEnv added in v0.28.0 

func NewScriptEnv(
	reqContext context.Context,
	fvmContext Context,
	txnState *state.TransactionState,
	programs environment.TransactionPrograms,
) environment.Environment

func NewTransactionEnvironment added in v0.20.0 

func NewTransactionEnvironment(
	ctx Context,
	txnState *state.TransactionState,
	programs environment.TransactionPrograms,
	tx *flow.TransactionBody,
	txIndex uint32,
	traceSpan otelTrace.Span,
) environment.Environment

Types

type Blocks 

type Blocks = environment.Blocks

TODO(patrick): rm once flow-emulator is updated

func NewBlockFinder added in v0.13.0 

func NewBlockFinder(storage storage.Headers) Blocks

TODO(patrick): rm once flow-emulator is updated

type BootstrapAccountKeys added in v0.27.0 

type BootstrapAccountKeys struct {
	ServiceAccountPublicKeys       []flow.AccountPublicKey
	FungibleTokenAccountPublicKeys []flow.AccountPublicKey
	FlowTokenAccountPublicKeys     []flow.AccountPublicKey
	FlowFeesAccountPublicKeys      []flow.AccountPublicKey
	NodeAccountPublicKeys          []flow.AccountPublicKey
}

type BootstrapProcedure 

type BootstrapProcedure struct {
	// contains filtered or unexported fields
}

A BootstrapProcedure is an invokable that can be used to bootstrap the ledger state with the default accounts and contracts required by the Flow virtual machine.

func Bootstrap 

func Bootstrap(
	serviceAccountPublicKey flow.AccountPublicKey,
	opts ...BootstrapProcedureOption,
) *BootstrapProcedure

Bootstrap returns a new BootstrapProcedure instance configured with the provided genesis parameters.

func (*BootstrapProcedure) ComputationLimit added in v0.25.2 

func (proc *BootstrapProcedure) ComputationLimit(_ Context) uint64

func (*BootstrapProcedure) ExecutionTime added in v0.28.0 

func (proc *BootstrapProcedure) ExecutionTime() programs.LogicalTime

func (*BootstrapProcedure) InitialSnapshotTime added in v0.28.0 

func (proc *BootstrapProcedure) InitialSnapshotTime() programs.LogicalTime

func (*BootstrapProcedure) MemoryLimit added in v0.25.2 

func (proc *BootstrapProcedure) MemoryLimit(_ Context) uint64

func (*BootstrapProcedure) Run 

func (b *BootstrapProcedure) Run(
	ctx Context,
	txnState *state.TransactionState,
	programs *programs.TransactionPrograms,
) error

func (*BootstrapProcedure) ShouldDisableMemoryAndInteractionLimits added in v0.28.0 

func (proc *BootstrapProcedure) ShouldDisableMemoryAndInteractionLimits(_ Context) bool

func (BootstrapProcedure) Type added in v0.28.0 

func (BootstrapProcedure) Type() ProcedureType

type BootstrapProcedureFeeParameters added in v0.25.2 

type BootstrapProcedureFeeParameters struct {
	SurgeFactor         cadence.UFix64
	InclusionEffortCost cadence.UFix64
	ExecutionEffortCost cadence.UFix64
}

type BootstrapProcedureOption added in v0.14.0 

type BootstrapProcedureOption func(*BootstrapProcedure) *BootstrapProcedure

func WithAccountCreationFee added in v0.14.0 

func WithAccountCreationFee(fee cadence.UFix64) BootstrapProcedureOption

func WithBootstrapAccountKeys added in v0.27.0 

func WithBootstrapAccountKeys(keys BootstrapAccountKeys) BootstrapProcedureOption

WithBootstrapAccountKeys sets the public keys of the accounts that will be created during bootstrapping by default all accounts are created with the ServiceAccountPublicKey specified when calling `Bootstrap`.

func WithEpochConfig added in v0.20.0 

func WithEpochConfig(epochConfig epochs.EpochConfig) BootstrapProcedureOption

func WithExecutionEffortWeights added in v0.25.5 

func WithExecutionEffortWeights(weights meter.ExecutionEffortWeights) BootstrapProcedureOption

func WithExecutionMemoryLimit added in v0.26.2 

func WithExecutionMemoryLimit(limit uint64) BootstrapProcedureOption

func WithExecutionMemoryWeights added in v0.26.0 

func WithExecutionMemoryWeights(weights meter.ExecutionMemoryWeights) BootstrapProcedureOption

func WithIdentities added in v0.20.0 

func WithIdentities(identities flow.IdentityList) BootstrapProcedureOption

func WithInitialTokenSupply added in v0.14.0 

func WithInitialTokenSupply(supply cadence.UFix64) BootstrapProcedureOption

func WithMinimumStorageReservation added in v0.14.0 

func WithMinimumStorageReservation(reservation cadence.UFix64) BootstrapProcedureOption

func WithRestrictedAccountCreationEnabled added in v0.17.6 

func WithRestrictedAccountCreationEnabled(enabled cadence.Bool) BootstrapProcedureOption

func WithRestrictedContractDeployment added in v0.26.0 

func WithRestrictedContractDeployment(restricted *bool) BootstrapProcedureOption

func WithRootBlock added in v0.20.0 

func WithRootBlock(rootBlock *flow.Header) BootstrapProcedureOption

func WithStorageMBPerFLOW added in v0.16.1 

func WithStorageMBPerFLOW(ratio cadence.UFix64) BootstrapProcedureOption

func WithTransactionFee added in v0.14.0 

func WithTransactionFee(fees BootstrapProcedureFeeParameters) BootstrapProcedureOption

type Context 

type Context struct {
	// DisableMemoryAndInteractionLimits will override memory and interaction
	// limits and set them to MaxUint64, effectively disabling these limits.
	DisableMemoryAndInteractionLimits bool
	ComputationLimit                  uint64
	MemoryLimit                       uint64
	MaxStateKeySize                   uint64
	MaxStateValueSize                 uint64
	MaxStateInteractionSize           uint64

	TransactionProcessors []TransactionProcessor
	ScriptProcessors      []ScriptProcessor

	BlockPrograms *programs.BlockPrograms

	environment.EnvironmentParams
}

A Context defines a set of execution parameters used by the virtual machine.

func NewContext 

func NewContext(opts ...Option) Context

NewContext initializes a new execution context with the provided options.

func NewContextFromParent 

func NewContextFromParent(parent Context, opts ...Option) Context

NewContextFromParent spawns a child execution context with the provided options.

type Option 

type Option func(ctx Context) Context

An Option sets a configuration parameter for a virtual machine context.

func WithAccountStorageLimit added in v0.14.0 

func WithAccountStorageLimit(enabled bool) Option

WithAccountStorageLimit enables or disables checking if account storage used is over its storage capacity

func WithBlockHeader 

func WithBlockHeader(header *flow.Header) Option

WithBlockHeader sets the block header for a virtual machine context.

The VM uses the header to provide current block information to the Cadence runtime, as well as to seed the pseudorandom number generator.

func WithBlockPrograms added in v0.28.0 

func WithBlockPrograms(programs *programs.BlockPrograms) Option

WithBlockPrograms sets the programs cache storage to be used by the transaction/script.

func WithBlocks 

func WithBlocks(blocks environment.Blocks) Option

WithBlocks sets the block storage provider for a virtual machine context.

The VM uses the block storage provider to provide historical block information to the Cadence runtime.

func WithCadenceLogging added in v0.13.1 

func WithCadenceLogging(enabled bool) Option

WithCadenceLogging enables or disables Cadence logging for a virtual machine context.

func WithChain 

func WithChain(chain flow.Chain) Option

WithChain sets the chain parameters for a virtual machine context.

func WithComputationLimit added in v0.25.2 

func WithComputationLimit(limit uint64) Option

WithComputationLimit sets the computation limit for a virtual machine context.

func WithContractDeploymentRestricted added in v0.27.0 

func WithContractDeploymentRestricted(enabled bool) Option

WithRestrictedContractDeployment enables or disables restricted contract deployment for a virtual machine context. Warning! this would be overridden with the flag stored on chain. this is just a fallback value

func WithContractRemovalRestricted added in v0.27.0 

func WithContractRemovalRestricted(enabled bool) Option

WithRestrictContractRemoval enables or disables restricted contract removal for a virtual machine context. Warning! this would be overridden with the flag stored on chain. this is just a fallback value

func WithEventCollectionSizeLimit added in v0.13.1 

func WithEventCollectionSizeLimit(limit uint64) Option

WithEventCollectionSizeLimit sets the event collection byte size limit for a virtual machine context.

func WithExtensiveTracing added in v0.16.0 

func WithExtensiveTracing() Option

WithExtensiveTracing sets the extensive tracing

func WithGasLimit 

func WithGasLimit(limit uint64) Option

WithGasLimit sets the computation limit for a virtual machine context. @depricated, please use WithComputationLimit instead.

func WithLogger added in v0.28.0 

func WithLogger(logger zerolog.Logger) Option

WithLogger sets the context logger

func WithMaxStateInteractionSize added in v0.14.0 

func WithMaxStateInteractionSize(limit uint64) Option

WithMaxStateInteractionSize sets the byte size limit for total interaction with ledger. this prevents attacks such as reading all large registers

func WithMaxStateKeySize added in v0.14.0 

func WithMaxStateKeySize(limit uint64) Option

WithMaxStateKeySize sets the byte size limit for ledger keys

func WithMaxStateValueSize added in v0.14.0 

func WithMaxStateValueSize(limit uint64) Option

WithMaxStateValueSize sets the byte size limit for ledger values

func WithMemoryAndInteractionLimitsDisabled added in v0.28.0 

func WithMemoryAndInteractionLimitsDisabled() Option

WithMemoryAndInteractionLimitsDisabled will override memory and interaction limits and set them to MaxUint64, effectively disabling these limits.

func WithMemoryLimit added in v0.25.2 

func WithMemoryLimit(limit uint64) Option

WithMemoryLimit sets the memory limit for a virtual machine context.

func WithMetricsReporter added in v0.17.6 

func WithMetricsReporter(mr environment.MetricsReporter) Option

WithMetricsReporter sets the metrics collector for a virtual machine context.

A metrics collector is used to gather metrics reported by the Cadence runtime.

func WithRestrictedDeployment 

func WithRestrictedDeployment(restricted bool) Option

@Depricated please use WithContractDeploymentRestricted instead of this this has been kept to reduce breaking change on the emulator, but would be removed at some point.

func WithReusableCadenceRuntimePool added in v0.28.0 

func WithReusableCadenceRuntimePool(
	pool reusableRuntime.ReusableCadenceRuntimePool,
) Option

WithReusableCadenceRuntimePool set the (shared) RedusableCadenceRuntimePool use for creating the cadence runtime.

func WithServiceAccount 

func WithServiceAccount(enabled bool) Option

WithServiceAccount enables or disables calls to the Flow service account.

func WithServiceEventCollectionEnabled added in v0.17.1 

func WithServiceEventCollectionEnabled() Option

WithServiceEventCollectionEnabled enables service event collection

func WithTracer added in v0.14.5 

func WithTracer(tr module.Tracer) Option

WithTracer sets the tracer for a virtual machine context.

func WithTransactionFeesEnabled added in v0.17.1 

func WithTransactionFeesEnabled(enabled bool) Option

WithTransactionFeesEnabled enables or disables deduction of transaction fees

func WithTransactionProcessors 

func WithTransactionProcessors(processors ...TransactionProcessor) Option

WithTransactionProcessors sets the transaction processors for a virtual machine context.

type Procedure 

type Procedure interface {
	Run(
		ctx Context,
		txnState *state.TransactionState,
		programs *programs.TransactionPrograms,
	) error

	ComputationLimit(ctx Context) uint64
	MemoryLimit(ctx Context) uint64
	ShouldDisableMemoryAndInteractionLimits(ctx Context) bool

	Type() ProcedureType

	// The initial snapshot time is used as part of OCC validation to ensure
	// there are no read-write conflict amongst transactions.  Note that once
	// we start supporting parallel preprocessing/execution, a transaction may
	// operation on mutliple snapshots.
	//
	// For scripts, since they can only be executed after the block has been
	// executed, the initial snapshot time is EndOfBlockExecutionTime.
	InitialSnapshotTime() programs.LogicalTime

	// For transactions, the execution time is TxIndex.  For scripts, the
	// execution time is EndOfBlockExecutionTime.
	ExecutionTime() programs.LogicalTime
}

An Procedure is an operation (or set of operations) that reads or writes ledger state.

type ProcedureType added in v0.28.0 

type ProcedureType string

type ScriptInvoker added in v0.23.2 

type ScriptInvoker struct{}

func NewScriptInvoker added in v0.23.2 

func NewScriptInvoker() ScriptInvoker

func (ScriptInvoker) Process added in v0.23.2 

func (i ScriptInvoker) Process(
	ctx Context,
	proc *ScriptProcedure,
	txnState *state.TransactionState,
	programs *programs.TransactionPrograms,
) error

type ScriptProcedure 

type ScriptProcedure struct {
	ID             flow.Identifier
	Script         []byte
	Arguments      [][]byte
	RequestContext context.Context
	Value          cadence.Value
	Logs           []string
	Events         []flow.Event
	GasUsed        uint64
	MemoryEstimate uint64
	Err            errors.CodedError
}

func NewScriptWithContextAndArgs added in v0.26.0 

func NewScriptWithContextAndArgs(
	code []byte,
	reqContext context.Context,
	args ...[]byte,
) *ScriptProcedure

func Script 

func Script(code []byte) *ScriptProcedure

func (*ScriptProcedure) ComputationLimit added in v0.25.2 

func (proc *ScriptProcedure) ComputationLimit(ctx Context) uint64

func (*ScriptProcedure) ExecutionTime added in v0.28.0 

func (proc *ScriptProcedure) ExecutionTime() programs.LogicalTime

func (*ScriptProcedure) InitialSnapshotTime added in v0.28.0 

func (proc *ScriptProcedure) InitialSnapshotTime() programs.LogicalTime

func (*ScriptProcedure) MemoryLimit added in v0.25.2 

func (proc *ScriptProcedure) MemoryLimit(ctx Context) uint64

func (*ScriptProcedure) Run 

func (proc *ScriptProcedure) Run(
	ctx Context,
	txnState *state.TransactionState,
	programs *programs.TransactionPrograms,
) error

func (*ScriptProcedure) ShouldDisableMemoryAndInteractionLimits added in v0.28.0 

func (proc *ScriptProcedure) ShouldDisableMemoryAndInteractionLimits(
	ctx Context,
) bool

func (ScriptProcedure) Type added in v0.28.0 

func (ScriptProcedure) Type() ProcedureType

func (*ScriptProcedure) WithArguments 

func (proc *ScriptProcedure) WithArguments(args ...[]byte) *ScriptProcedure

func (*ScriptProcedure) WithRequestContext added in v0.26.0 

func (proc *ScriptProcedure) WithRequestContext(
	reqContext context.Context,
) *ScriptProcedure

type ScriptProcessor 

type ScriptProcessor interface {
	Process(
		Context,
		*ScriptProcedure,
		*state.TransactionState,
		*programs.TransactionPrograms,
	) error
}

type TransactionInvoker added in v0.23.2 

type TransactionInvoker struct {
}

func NewTransactionInvoker added in v0.23.2 

func NewTransactionInvoker() TransactionInvoker

func (TransactionInvoker) Process added in v0.23.2 

func (i TransactionInvoker) Process(
	ctx Context,
	proc *TransactionProcedure,
	txnState *state.TransactionState,
	programs *programsCache.TransactionPrograms,
) (processErr error)

type TransactionProcedure 

type TransactionProcedure struct {
	ID                     flow.Identifier
	Transaction            *flow.TransactionBody
	InitialSnapshotTxIndex uint32
	TxIndex                uint32

	Logs            []string
	Events          []flow.Event
	ServiceEvents   []flow.Event
	ComputationUsed uint64
	MemoryEstimate  uint64
	Err             errors.CodedError
	TraceSpan       otelTrace.Span
}

func Transaction 

func Transaction(tx *flow.TransactionBody, txIndex uint32) *TransactionProcedure

TODO(patrick): pass in initial snapshot time when we start supporting speculative pre-processing / execution.

func (*TransactionProcedure) ComputationLimit added in v0.25.2 

func (proc *TransactionProcedure) ComputationLimit(ctx Context) uint64

func (*TransactionProcedure) ExecutionTime added in v0.28.0 

func (proc *TransactionProcedure) ExecutionTime() programs.LogicalTime

func (*TransactionProcedure) InitialSnapshotTime added in v0.28.0 

func (proc *TransactionProcedure) InitialSnapshotTime() programs.LogicalTime

func (*TransactionProcedure) IsSampled added in v0.28.2 

func (proc *TransactionProcedure) IsSampled() bool

func (*TransactionProcedure) MemoryLimit added in v0.25.2 

func (proc *TransactionProcedure) MemoryLimit(ctx Context) uint64

func (*TransactionProcedure) Run 

func (proc *TransactionProcedure) Run(
	ctx Context,
	txnState *state.TransactionState,
	programs *programs.TransactionPrograms,
) error

func (*TransactionProcedure) SetTraceSpan added in v0.14.5 

func (proc *TransactionProcedure) SetTraceSpan(traceSpan otelTrace.Span)

func (*TransactionProcedure) ShouldDisableMemoryAndInteractionLimits added in v0.28.0 

func (proc *TransactionProcedure) ShouldDisableMemoryAndInteractionLimits(
	ctx Context,
) bool

func (*TransactionProcedure) StartSpanFromProcTraceSpan added in v0.28.2 

func (proc *TransactionProcedure) StartSpanFromProcTraceSpan(
	tracer module.Tracer,
	spanName trace.SpanName) otelTrace.Span

func (TransactionProcedure) Type added in v0.28.0 

func (TransactionProcedure) Type() ProcedureType

type TransactionProcessor 

type TransactionProcessor interface {
	Process(
		Context,
		*TransactionProcedure,
		*state.TransactionState,
		*programs.TransactionPrograms,
	) error
}

type TransactionSequenceNumberChecker 

type TransactionSequenceNumberChecker struct{}

func NewTransactionSequenceNumberChecker 

func NewTransactionSequenceNumberChecker() *TransactionSequenceNumberChecker

func (*TransactionSequenceNumberChecker) Process 

func (c *TransactionSequenceNumberChecker) Process(
	ctx Context,
	proc *TransactionProcedure,
	txnState *state.TransactionState,
	_ *programs.TransactionPrograms,
) error

type TransactionStorageLimiter added in v0.14.0 

type TransactionStorageLimiter struct{}

func NewTransactionStorageLimiter added in v0.14.0 

func NewTransactionStorageLimiter() TransactionStorageLimiter

func (TransactionStorageLimiter) CheckLimits added in v0.20.0 

func (d TransactionStorageLimiter) CheckLimits(
	env environment.Environment,
	addresses []flow.Address,
) error

type TransactionVerifier added in v0.27.0 

type TransactionVerifier struct {
	KeyWeightThreshold int
}

TransactionVerifier verifies the content of the transaction by checking accounts (authorizers, payer, proposer) are not frozen checking there is no double signature all signatures are valid all accounts provides enoguh weights

if KeyWeightThreshold is set to a negative number, signature verification is skipped

func NewTransactionVerifier added in v0.27.0 

func NewTransactionVerifier(keyWeightThreshold int) *TransactionVerifier

func (*TransactionVerifier) Process added in v0.27.0 

func (v *TransactionVerifier) Process(
	ctx Context,
	proc *TransactionProcedure,
	txnState *state.TransactionState,
	_ *programs.TransactionPrograms,
) error

type VirtualMachine 

type VirtualMachine struct {
}

A VirtualMachine augments the Cadence runtime with Flow host functionality.

func NewVirtualMachine added in v0.15.1 

func NewVirtualMachine() *VirtualMachine

func (*VirtualMachine) GetAccount 

func (vm *VirtualMachine) GetAccount(
	ctx Context,
	address flow.Address,
	v state.View,
) (
	*flow.Account,
	error,
)

GetAccount returns an account by address or an error if none exists.

func (*VirtualMachine) Run 

func (vm *VirtualMachine) Run(
	ctx Context,
	proc Procedure,
	v state.View,
) error

Run runs a procedure against a ledger in the given context.

Source Files

View all Source files

Directories

Path Synopsis
mock
state
testutil
Package systemcontracts stores canonical address locations for all system smart contracts and service events.
 Package systemcontracts stores canonical address locations for all system smart contracts and service events.

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