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txscript: Move error definitions to error.go. #390

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Apr 21, 2015
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txscript: Move error definitions to error.go. #390

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154 changes: 154 additions & 0 deletions txscript/error.go
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Original file line number Diff line number Diff line change
@@ -0,0 +1,154 @@
// Copyright (c) 2013-2015 Conformal Systems LLC.
// Use of this source code is governed by an ISC
// license that can be found in the LICENSE file.

package txscript

import (
"errors"
"fmt"
)

var (
// ErrStackShortScript is returned if the script has an opcode that is
// too long for the length of the script.
ErrStackShortScript = errors.New("execute past end of script")

// ErrStackLongScript is returned if the script has an opcode that is
// too long for the length of the script.
ErrStackLongScript = errors.New("script is longer than maximum allowed")

// ErrStackUnderflow is returned if an opcode requires more items on the
// stack than is present.f
ErrStackUnderflow = errors.New("stack underflow")

// ErrStackInvalidArgs is returned if the argument for an opcode is out
// of acceptable range.
ErrStackInvalidArgs = errors.New("invalid argument")

// ErrStackOpDisabled is returned when a disabled opcode is encountered
// in the script.
ErrStackOpDisabled = errors.New("Disabled Opcode")

// ErrStackVerifyFailed is returned when one of the OP_VERIFY or
// OP_*VERIFY instructions is executed and the conditions fails.
ErrStackVerifyFailed = errors.New("Verify failed")

// ErrStackNumberTooBig is returned when the argument for an opcode that
// should be an offset is obviously far too large.
ErrStackNumberTooBig = errors.New("number too big")

// ErrStackInvalidOpcode is returned when an opcode marked as invalid or
// a completely undefined opcode is encountered.
ErrStackInvalidOpcode = errors.New("Invalid Opcode")

// ErrStackReservedOpcode is returned when an opcode marked as reserved
// is encountered.
ErrStackReservedOpcode = errors.New("Reserved Opcode")

// ErrStackEarlyReturn is returned when OP_RETURN is executed in the
// script.
ErrStackEarlyReturn = errors.New("Script returned early")

// ErrStackNoIf is returned if an OP_ELSE or OP_ENDIF is encountered
// without first having an OP_IF or OP_NOTIF in the script.
ErrStackNoIf = errors.New("OP_ELSE or OP_ENDIF with no matching OP_IF")

// ErrStackMissingEndif is returned if the end of a script is reached
// without and OP_ENDIF to correspond to a conditional expression.
ErrStackMissingEndif = fmt.Errorf("execute fail, in conditional execution")

// ErrStackTooManyPubkeys is returned if an OP_CHECKMULTISIG is
// encountered with more than MaxPubKeysPerMultiSig pubkeys present.
ErrStackTooManyPubkeys = errors.New("Invalid pubkey count in OP_CHECKMULTISIG")

// ErrStackTooManyOperations is returned if a script has more than
// MaxOpsPerScript opcodes that do not push data.
ErrStackTooManyOperations = errors.New("Too many operations in script")

// ErrStackElementTooBig is returned if the size of an element to be
// pushed to the stack is over MaxScriptElementSize.
ErrStackElementTooBig = errors.New("Element in script too large")

// ErrStackUnknownAddress is returned when ScriptToAddrHash does not
// recognise the pattern of the script and thus can not find the address
// for payment.
ErrStackUnknownAddress = errors.New("non-recognised address")

// ErrStackScriptFailed is returned when at the end of a script the
// boolean on top of the stack is false signifying that the script has
// failed.
ErrStackScriptFailed = errors.New("execute fail, fail on stack")

// ErrStackScriptUnfinished is returned when CheckErrorCondition is
// called on a script that has not finished executing.
ErrStackScriptUnfinished = errors.New("Error check when script unfinished")

// ErrStackEmptyStack is returned when the stack is empty at the end of
// execution. Normal operation requires that a boolean is on top of the
// stack when the scripts have finished executing.
ErrStackEmptyStack = errors.New("Stack empty at end of execution")

// ErrStackP2SHNonPushOnly is returned when a Pay-to-Script-Hash
// transaction is encountered and the ScriptSig does operations other
// than push data (in violation of bip16).
ErrStackP2SHNonPushOnly = errors.New("pay to script hash with non " +
"pushonly input")

// ErrStackInvalidParseType is an internal error returned from
// ScriptToAddrHash ony if the internal data tables are wrong.
ErrStackInvalidParseType = errors.New("internal error: invalid parsetype found")

// ErrStackInvalidAddrOffset is an internal error returned from
// ScriptToAddrHash ony if the internal data tables are wrong.
ErrStackInvalidAddrOffset = errors.New("internal error: invalid offset found")

// ErrStackInvalidIndex is returned when an out-of-bounds index was
// passed to a function.
ErrStackInvalidIndex = errors.New("Invalid script index")

// ErrStackNonPushOnly is returned when ScriptInfo is called with a
// pkScript that peforms operations other that pushing data to the stack.
ErrStackNonPushOnly = errors.New("SigScript is non pushonly")

// ErrStackOverflow is returned when stack and altstack combined depth
// is over the limit.
ErrStackOverflow = errors.New("Stacks overflowed")

// ErrStackInvalidLowSSignature is returned when the ScriptVerifyLowS
// flag is set and the script contains any signatures whose S values
// are higher than the half order.
ErrStackInvalidLowSSignature = errors.New("invalid low s signature")

// ErrStackInvalidPubKey is returned when the ScriptVerifyScriptEncoding
// flag is set and the script contains invalid pubkeys.
ErrStackInvalidPubKey = errors.New("invalid strict pubkey")

// ErrStackCleanStack is returned when the ScriptVerifyCleanStack flag
// is set and after evalution the stack does not contain only one element,
// which also must be true if interpreted as a boolean.
ErrStackCleanStack = errors.New("stack is not clean")

// ErrStackMinimalData is returned when the ScriptVerifyMinimalData flag
// is set and the script contains push operations that do not use
// the minimal opcode required.
ErrStackMinimalData = errors.New("non-minimally encoded script number")
)

var (
// ErrInvalidFlags is returned when the passed flags to NewScript
// contain an invalid combination.
ErrInvalidFlags = errors.New("invalid flags combination")

// ErrInvalidIndex is returned when the passed input index for the
// provided transaction is out of range.
ErrInvalidIndex = errors.New("invalid input index")

// ErrUnsupportedAddress is returned when a concrete type that
// implements a btcutil.Address is not a supported type.
ErrUnsupportedAddress = errors.New("unsupported address type")

// ErrBadNumRequired is returned from MultiSigScript when nrequired is
// larger than the number of provided public keys.
ErrBadNumRequired = errors.New("more signatures required than keys present")
)
143 changes: 0 additions & 143 deletions txscript/script.go
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Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -7,7 +7,6 @@ package txscript
import (
"bytes"
"encoding/binary"
"errors"
"fmt"
"math/big"
"time"
Expand All @@ -17,140 +16,6 @@ import (
"github.com/btcsuite/btcutil"
)

var (
// ErrStackShortScript is returned if the script has an opcode that is
// too long for the length of the script.
ErrStackShortScript = errors.New("execute past end of script")

// ErrStackLongScript is returned if the script has an opcode that is
// too long for the length of the script.
ErrStackLongScript = errors.New("script is longer than maximum allowed")

// ErrStackUnderflow is returned if an opcode requires more items on the
// stack than is present.f
ErrStackUnderflow = errors.New("stack underflow")

// ErrStackInvalidArgs is returned if the argument for an opcode is out
// of acceptable range.
ErrStackInvalidArgs = errors.New("invalid argument")

// ErrStackOpDisabled is returned when a disabled opcode is encountered
// in the script.
ErrStackOpDisabled = errors.New("Disabled Opcode")

// ErrStackVerifyFailed is returned when one of the OP_VERIFY or
// OP_*VERIFY instructions is executed and the conditions fails.
ErrStackVerifyFailed = errors.New("Verify failed")

// ErrStackNumberTooBig is returned when the argument for an opcode that
// should be an offset is obviously far too large.
ErrStackNumberTooBig = errors.New("number too big")

// ErrStackInvalidOpcode is returned when an opcode marked as invalid or
// a completely undefined opcode is encountered.
ErrStackInvalidOpcode = errors.New("Invalid Opcode")

// ErrStackReservedOpcode is returned when an opcode marked as reserved
// is encountered.
ErrStackReservedOpcode = errors.New("Reserved Opcode")

// ErrStackEarlyReturn is returned when OP_RETURN is executed in the
// script.
ErrStackEarlyReturn = errors.New("Script returned early")

// ErrStackNoIf is returned if an OP_ELSE or OP_ENDIF is encountered
// without first having an OP_IF or OP_NOTIF in the script.
ErrStackNoIf = errors.New("OP_ELSE or OP_ENDIF with no matching OP_IF")

// ErrStackMissingEndif is returned if the end of a script is reached
// without and OP_ENDIF to correspond to a conditional expression.
ErrStackMissingEndif = fmt.Errorf("execute fail, in conditional execution")

// ErrStackTooManyPubkeys is returned if an OP_CHECKMULTISIG is
// encountered with more than MaxPubKeysPerMultiSig pubkeys present.
ErrStackTooManyPubkeys = errors.New("Invalid pubkey count in OP_CHECKMULTISIG")

// ErrStackTooManyOperations is returned if a script has more than
// MaxOpsPerScript opcodes that do not push data.
ErrStackTooManyOperations = errors.New("Too many operations in script")

// ErrStackElementTooBig is returned if the size of an element to be
// pushed to the stack is over MaxScriptElementSize.
ErrStackElementTooBig = errors.New("Element in script too large")

// ErrStackUnknownAddress is returned when ScriptToAddrHash does not
// recognise the pattern of the script and thus can not find the address
// for payment.
ErrStackUnknownAddress = errors.New("non-recognised address")

// ErrStackScriptFailed is returned when at the end of a script the
// boolean on top of the stack is false signifying that the script has
// failed.
ErrStackScriptFailed = errors.New("execute fail, fail on stack")

// ErrStackScriptUnfinished is returned when CheckErrorCondition is
// called on a script that has not finished executing.
ErrStackScriptUnfinished = errors.New("Error check when script unfinished")

// ErrStackEmptyStack is returned when the stack is empty at the end of
// execution. Normal operation requires that a boolean is on top of the
// stack when the scripts have finished executing.
ErrStackEmptyStack = errors.New("Stack empty at end of execution")

// ErrStackP2SHNonPushOnly is returned when a Pay-to-Script-Hash
// transaction is encountered and the ScriptSig does operations other
// than push data (in violation of bip16).
ErrStackP2SHNonPushOnly = errors.New("pay to script hash with non " +
"pushonly input")

// ErrStackInvalidParseType is an internal error returned from
// ScriptToAddrHash ony if the internal data tables are wrong.
ErrStackInvalidParseType = errors.New("internal error: invalid parsetype found")

// ErrStackInvalidAddrOffset is an internal error returned from
// ScriptToAddrHash ony if the internal data tables are wrong.
ErrStackInvalidAddrOffset = errors.New("internal error: invalid offset found")

// ErrStackInvalidIndex is returned when an out-of-bounds index was
// passed to a function.
ErrStackInvalidIndex = errors.New("Invalid script index")

// ErrStackNonPushOnly is returned when ScriptInfo is called with a
// pkScript that peforms operations other that pushing data to the stack.
ErrStackNonPushOnly = errors.New("SigScript is non pushonly")

// ErrStackOverflow is returned when stack and altstack combined depth
// is over the limit.
ErrStackOverflow = errors.New("Stacks overflowed")

// ErrStackInvalidLowSSignature is returned when the ScriptVerifyLowS
// flag is set and the script contains any signatures whose S values
// are higher than the half order.
ErrStackInvalidLowSSignature = errors.New("invalid low s signature")

// ErrStackInvalidPubKey is returned when the ScriptVerifyScriptEncoding
// flag is set and the script contains invalid pubkeys.
ErrStackInvalidPubKey = errors.New("invalid strict pubkey")

// ErrStackCleanStack is returned when the ScriptVerifyCleanStack flag
// is set and after evalution the stack does not contain only one element,
// which also must be true if interpreted as a boolean.
ErrStackCleanStack = errors.New("stack is not clean")

// ErrStackMinimalData is returned when the ScriptVerifyMinimalData flag
// is set and the script contains push operations that do not use
// the minimal opcode required.
ErrStackMinimalData = errors.New("non-minimally encoded script number")

// ErrInvalidFlags is returned when the passed flags to NewScript contain
// an invalid combination.
ErrInvalidFlags = errors.New("invalid flags combination")

// ErrInvalidIndex is returned when the passed input index for the
// provided transaction is out of range.
ErrInvalidIndex = errors.New("invalid input index")
)

const (
// maxDataCarrierSize is the maximum number of bytes allowed in pushed
// data to be considered a nulldata transaction
Expand All @@ -164,10 +29,6 @@ const (
maxScriptSize = 10000
)

// ErrUnsupportedAddress is returned when a concrete type that implements
// a btcutil.Address is not a supported type.
var ErrUnsupportedAddress = errors.New("unsupported address type")

// Bip16Activation is the timestamp where BIP0016 is valid to use in the
// blockchain. To be used to determine if BIP0016 should be called for or not.
// This timestamp corresponds to Sun Apr 1 00:00:00 UTC 2012.
Expand Down Expand Up @@ -746,10 +607,6 @@ func PayToAddrScript(addr btcutil.Address) ([]byte, error) {
return nil, ErrUnsupportedAddress
}

// ErrBadNumRequired is returned from MultiSigScript when nrequired is larger
// than the number of provided public keys.
var ErrBadNumRequired = errors.New("more signatures required than keys present")

// MultiSigScript returns a valid script for a multisignature redemption where
// nrequired of the keys in pubkeys are required to have signed the transaction
// for success. An ErrBadNumRequired will be returned if nrequired is larger than
Expand Down