errs

Documentation

Overview

Package errs comment

Index

• func IsErrorCode(err error, c ErrorCode) bool
• type Error
  • func NewError(c ErrorCode, desc string, fmtArgs ...interface{}) Error
  • func (e Error) Error() string
• type ErrorCode
  • func (e ErrorCode) String() string

Functions

func IsErrorCode

func IsErrorCode(err error, c ErrorCode) bool

IsErrorCode returns whether the provided error is a script error with the provided error code.

Types

type Error

type Error struct {
	ErrorCode   ErrorCode
	Description string
}

Error identifies a script-related error. It is used to indicate three classes of errors:

1. Script execution failures due to violating one of the many requirements imposed by the script engine or evaluating to false
2. Improper API usage by callers
3. Internal consistency check failures

The caller can use type assertions on the returned errors to access the ErrorCode field to ascertain the specific reason for the error. As an additional convenience, the caller may make use of the IsErrorCode function to check for a specific error code.

func NewError

func NewError(c ErrorCode, desc string, fmtArgs ...interface{}) Error

NewError creates an Error given a set of arguments.

func (Error) Error

func (e Error) Error() string

Error satisfies the error interface and prints human-readable errors.

type ErrorCode

type ErrorCode int

ErrorCode identifies a kind of script error.

const (
	// ErrInternal is returned if internal consistency checks fail.  In
	// practice this error should never be seen as it would mean there is an
	// error in the engine logic.
	ErrInternal ErrorCode = iota

	// ErrOK represents successful execution. It should be treated similar to that
	// ok io.EOF
	ErrOK

	// ErrInvalidFlags is returned when the passed flags to NewEngine
	// contain an invalid combination.
	ErrInvalidFlags

	// ErrInvalidIndex is returned when an out-of-bounds index is passed to
	// a function.
	ErrInvalidIndex

	// ErrUnsupportedAddress is returned when a concrete type that
	// implements a bsvutil.Address is not a supported type.
	ErrUnsupportedAddress

	// ErrNotMultisigScript is returned from CalcMultiSigStats when the
	// provided script is not a multisig script.
	ErrNotMultisigScript

	// ErrTooManyRequiredSigs is returned from MultiSigScript when the
	// specified number of required signatures is larger than the number of
	// provided public keys.
	ErrTooManyRequiredSigs

	// ErrTooMuchNullData is returned from NullDataScript when the length of
	// the provided data exceeds MaxDataCarrierSize.
	ErrTooMuchNullData

	// ErrInvalidParams is returned when the ExectionParams passed to the Execute
	// func have errors.
	ErrInvalidParams

	// ErrEarlyReturn is returned when OP_RETURN is executed in the script.
	ErrEarlyReturn

	// ErrEmptyStack is returned when the script evaluated without error,
	// but terminated with an empty top stack element.
	ErrEmptyStack

	// ErrEvalFalse is returned when the script evaluated without error but
	// terminated with a false top stack element.
	ErrEvalFalse

	// ErrScriptUnfinished is returned when CheckErrorCondition is called on
	// a script that has not finished executing.
	ErrScriptUnfinished

	// ErrInvalidProgramCounter is returned when an attempt to execute an opcode is
	// made once all of them have already been executed.  This can happen
	// due to things such as a second call to Execute or calling Step after
	// all opcodes have already been executed.
	ErrInvalidProgramCounter

	// ErrScriptTooBig is returned if a script is larger than MaxScriptSize.
	ErrScriptTooBig

	// ErrElementTooBig is returned if the size of an element to be pushed
	// to the stack is over MaxScriptElementSize.
	ErrElementTooBig

	// ErrTooManyOperations is returned if a script has more than
	// MaxOpsPerScript opcodes that do not push data.
	ErrTooManyOperations

	// ErrStackOverflow is returned when stack and altstack combined depth
	// is over the limit.
	ErrStackOverflow

	// ErrInvalidPubKeyCount is returned when the number of public keys
	// specified for a multisig is either negative or greater than
	// MaxPubKeysPerMultiSig.
	ErrInvalidPubKeyCount

	// ErrInvalidSignatureCount is returned when the number of signatures
	// specified for a multisig is either negative or greater than the
	// number of public keys.
	ErrInvalidSignatureCount

	// ErrNumberTooBig is returned when the argument for an opcode that
	// expects numeric input is larger than the expected maximum number of
	// bytes.  For the most part, opcodes that deal with stack manipulation
	// via offsets, arithmetic, numeric comparison, and boolean logic are
	// those that this applies to.  However, any opcode that expects numeric
	// input may fail with this code.
	ErrNumberTooBig

	// ErrNumberTooSmall is returned when the argument for an opcode that
	// expects numeric input is smaller than the expected maximum number of
	// bytes.  For the most part, opcodes that deal with stack manipulation
	// via offsets, arithmetic, numeric comparison, and boolean logic are
	// those that this applies to.  However, any opcode that expects numeric
	// input may fail with this code.
	ErrNumberTooSmall

	// ErrDivideByZero is returned when OP_DIV is invoked to divide a number
	// by zero
	ErrDivideByZero

	// ErrVerify is returned when OP_VERIFY is encountered in a script and
	// the top item on the data stack does not evaluate to true.
	ErrVerify

	// ErrEqualVerify is returned when OP_EQUALVERIFY is encountered in a
	// script and the top item on the data stack does not evaluate to true.
	ErrEqualVerify

	// ErrNumEqualVerify is returned when OP_NUMEQUALVERIFY is encountered
	// in a script and the top item on the data stack does not evaluate to
	// true.
	ErrNumEqualVerify

	// ErrCheckSigVerify is returned when OP_CHECKSIGVERIFY is encountered
	// in a script and the top item on the data stack does not evaluate to
	// true.
	ErrCheckSigVerify

	// ErrCheckMultiSigVerify is returned when OP_CHECKMULTISIGVERIFY is
	// encountered in a script and the top item on the data stack does not
	// evaluate to true.
	ErrCheckMultiSigVerify

	// ErrDisabledOpcode is returned when a disabled opcode is encountered
	// in a script.
	ErrDisabledOpcode

	// ErrReservedOpcode is returned when an opcode marked as reserved
	// is encountered in a script.
	ErrReservedOpcode

	// ErrMalformedPush is returned when a data push opcode tries to push
	// more bytes than are left in the script.
	ErrMalformedPush

	// ErrInvalidStackOperation is returned when a stack operation is
	// attempted with a number that is invalid for the current stack size.
	ErrInvalidStackOperation

	// ErrUnbalancedConditional is returned when an OP_ELSE or OP_ENDIF is
	// encountered in a script without first having an OP_IF or OP_NOTIF or
	// the end of script is reached without encountering an OP_ENDIF when
	// an OP_IF or OP_NOTIF was previously encountered.
	ErrUnbalancedConditional

	// ErrInvalidInputLength is returned when an input to an opcode is not
	// the correct length as required by that opcode.
	ErrInvalidInputLength

	// ErrMinimalData is returned when the ScriptVerifyMinimalData flag
	// is set and the script contains push operations that do not use
	// the minimal opcode required.
	ErrMinimalData

	// ErrMinimalIf is returned when the ScriptVerifyMinimalIf flag
	// is set and the script contains if operations that do not use
	// the minimal opcode required.
	ErrMinimalIf

	// ErrInvalidSigHashType is returned when a signature hash type is not
	// one of the supported types.
	ErrInvalidSigHashType

	// ErrSigTooShort is returned when a signature that should be a
	// canonically-encoded DER signature is too short.
	ErrSigTooShort

	// ErrSigTooLong is returned when a signature that should be a
	// canonically-encoded DER signature is too long.
	ErrSigTooLong

	// ErrSigInvalidSeqID is returned when a signature that should be a
	// canonically-encoded DER signature does not have the expected ASN.1
	// sequence ID.
	ErrSigInvalidSeqID

	// ErrSigInvalidDataLen is returned a signature that should be a
	// canonically-encoded DER signature does not specify the correct number
	// of remaining bytes for the R and S portions.
	ErrSigInvalidDataLen

	// ErrSigMissingSTypeID is returned a signature that should be a
	// canonically-encoded DER signature does not provide the ASN.1 type ID
	// for S.
	ErrSigMissingSTypeID

	// ErrSigMissingSLen is returned when a signature that should be a
	// canonically-encoded DER signature does not provide the length of S.
	ErrSigMissingSLen

	// ErrSigInvalidSLen is returned a signature that should be a
	// canonically-encoded DER signature does not specify the correct number
	// of bytes for the S portion.
	ErrSigInvalidSLen

	// ErrSigInvalidRIntID is returned when a signature that should be a
	// canonically-encoded DER signature does not have the expected ASN.1
	// integer ID for R.
	ErrSigInvalidRIntID

	// ErrSigZeroRLen is returned when a signature that should be a
	// canonically-encoded DER signature has an R length of zero.
	ErrSigZeroRLen

	// ErrSigNegativeR is returned when a signature that should be a
	// canonically-encoded DER signature has a negative value for R.
	ErrSigNegativeR

	// ErrSigTooMuchRPadding is returned when a signature that should be a
	// canonically-encoded DER signature has too much padding for R.
	ErrSigTooMuchRPadding

	// ErrSigInvalidSIntID is returned when a signature that should be a
	// canonically-encoded DER signature does not have the expected ASN.1
	// integer ID for S.
	ErrSigInvalidSIntID

	// ErrSigZeroSLen is returned when a signature that should be a
	// canonically-encoded DER signature has an S length of zero.
	ErrSigZeroSLen

	// ErrSigNegativeS is returned when a signature that should be a
	// canonically-encoded DER signature has a negative value for S.
	ErrSigNegativeS

	// ErrSigTooMuchSPadding is returned when a signature that should be a
	// canonically-encoded DER signature has too much padding for S.
	ErrSigTooMuchSPadding

	// ErrSigHighS is returned when the ScriptVerifyLowS flag is set and the
	// script contains any signatures whose S values are higher than the
	// half order.
	ErrSigHighS

	// ErrNotPushOnly is returned when a script that is required to only
	// push data to the stack performs other operations.  A couple of cases
	// where this applies is for a pay-to-script-hash signature script when
	// bip16 is active and when the ScriptVerifySigPushOnly flag is set.
	ErrNotPushOnly

	// ErrSigNullDummy is returned when the ScriptStrictMultiSig flag is set
	// and a multisig script has anything other than 0 for the extra dummy
	// argument.
	ErrSigNullDummy

	// ErrPubKeyType is returned when the ScriptVerifyStrictEncoding
	// flag is set and the script contains invalid public keys.
	ErrPubKeyType

	// ErrCleanStack is returned when the ScriptVerifyCleanStack flag
	// is set, and after evaluation, the stack does not contain only a
	// single element.
	ErrCleanStack

	// ErrNullFail is returned when the ScriptVerifyNullFail flag is
	// set and signatures are not empty on failed checksig or checkmultisig
	// operations.
	ErrNullFail

	// ErrDiscourageUpgradableNOPs is returned when the
	// ScriptDiscourageUpgradableNops flag is set and a NOP opcode is
	// encountered in a script.
	ErrDiscourageUpgradableNOPs

	// ErrNegativeLockTime is returned when a script contains an opcode that
	// interprets a negative lock time.
	ErrNegativeLockTime

	// ErrUnsatisfiedLockTime is returned when a script contains an opcode
	// that involves a lock time and the required lock time has not been
	// reached.
	ErrUnsatisfiedLockTime

	// ErrIllegalForkID is returned when either the ScriptEnableSighashForkID flag is set, but
	// the transaction doesn't have a ForkID sighash flag, or when the transaction does have the ForkID
	// set, but the ScriptEnableSighashForkID flag is not set.
	ErrIllegalForkID
)

These constants are used to identify a specific Error.

func (ErrorCode) String

func (e ErrorCode) String() string

String returns the ErrorCode as a human-readable name.