8eb6d7cf87
We define the witness constanst we need for fee estimation for this HTLC second level type.
621 lines
21 KiB
Go
621 lines
21 KiB
Go
package input
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import (
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"github.com/btcsuite/btcd/blockchain"
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"github.com/btcsuite/btcd/wire"
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)
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const (
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// witnessScaleFactor determines the level of "discount" witness data
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// receives compared to "base" data. A scale factor of 4, denotes that
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// witness data is 1/4 as cheap as regular non-witness data. Value copied
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// here for convenience.
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witnessScaleFactor = blockchain.WitnessScaleFactor
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// The weight(weight), which is different from the !size! (see BIP-141),
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// is calculated as:
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// Weight = 4 * BaseSize + WitnessSize (weight).
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// BaseSize - size of the transaction without witness data (bytes).
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// WitnessSize - witness size (bytes).
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// Weight - the metric for determining the weight of the transaction.
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// P2WPKHSize 22 bytes
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// - OP_0: 1 byte
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// - OP_DATA: 1 byte (PublicKeyHASH160 length)
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// - PublicKeyHASH160: 20 bytes
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P2WPKHSize = 1 + 1 + 20
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// NestedP2WPKHSize 23 bytes
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// - OP_DATA: 1 byte (P2WPKHSize)
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// - P2WPKHWitnessProgram: 22 bytes
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NestedP2WPKHSize = 1 + P2WPKHSize
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// P2WSHSize 34 bytes
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// - OP_0: 1 byte
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// - OP_DATA: 1 byte (WitnessScriptSHA256 length)
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// - WitnessScriptSHA256: 32 bytes
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P2WSHSize = 1 + 1 + 32
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// NestedP2WSHSize 35 bytes
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// - OP_DATA: 1 byte (P2WSHSize)
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// - P2WSHWitnessProgram: 34 bytes
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NestedP2WSHSize = 1 + P2WSHSize
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// P2PKHOutputSize 34 bytes
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// - value: 8 bytes
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// - var_int: 1 byte (pkscript_length)
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// - pkscript (p2pkh): 25 bytes
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P2PKHOutputSize = 8 + 1 + 25
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// P2WKHOutputSize 31 bytes
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// - value: 8 bytes
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// - var_int: 1 byte (pkscript_length)
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// - pkscript (p2wpkh): 22 bytes
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P2WKHOutputSize = 8 + 1 + P2WPKHSize
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// P2WSHOutputSize 43 bytes
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// - value: 8 bytes
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// - var_int: 1 byte (pkscript_length)
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// - pkscript (p2wsh): 34 bytes
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P2WSHOutputSize = 8 + 1 + P2WSHSize
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// P2SHOutputSize 32 bytes
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// - value: 8 bytes
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// - var_int: 1 byte (pkscript_length)
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// - pkscript (p2sh): 23 bytes
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P2SHOutputSize = 8 + 1 + 23
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// P2PKHScriptSigSize 108 bytes
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// - OP_DATA: 1 byte (signature length)
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// - signature
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// - OP_DATA: 1 byte (pubkey length)
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// - pubkey
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P2PKHScriptSigSize = 1 + 73 + 1 + 33
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// P2WKHWitnessSize 109 bytes
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// - number_of_witness_elements: 1 byte
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// - signature_length: 1 byte
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// - signature
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// - pubkey_length: 1 byte
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// - pubkey
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P2WKHWitnessSize = 1 + 1 + 73 + 1 + 33
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// MultiSigSize 71 bytes
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// - OP_2: 1 byte
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// - OP_DATA: 1 byte (pubKeyAlice length)
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// - pubKeyAlice: 33 bytes
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// - OP_DATA: 1 byte (pubKeyBob length)
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// - pubKeyBob: 33 bytes
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// - OP_2: 1 byte
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// - OP_CHECKMULTISIG: 1 byte
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MultiSigSize = 1 + 1 + 33 + 1 + 33 + 1 + 1
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// MultiSigWitnessSize 222 bytes
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// - NumberOfWitnessElements: 1 byte
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// - NilLength: 1 byte
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// - sigAliceLength: 1 byte
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// - sigAlice: 73 bytes
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// - sigBobLength: 1 byte
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// - sigBob: 73 bytes
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// - WitnessScriptLength: 1 byte
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// - WitnessScript (MultiSig)
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MultiSigWitnessSize = 1 + 1 + 1 + 73 + 1 + 73 + 1 + MultiSigSize
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// InputSize 41 bytes
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// - PreviousOutPoint:
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// - Hash: 32 bytes
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// - Index: 4 bytes
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// - OP_DATA: 1 byte (ScriptSigLength)
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// - ScriptSig: 0 bytes
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// - Witness <---- we use "Witness" instead of "ScriptSig" for
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// transaction validation, but "Witness" is stored
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// separately and weight for it size is smaller. So
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// we separate the calculation of ordinary data
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// from witness data.
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// - Sequence: 4 bytes
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InputSize = 32 + 4 + 1 + 4
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// FundingInputSize represents the size of an input to a funding
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// transaction, and is equivalent to the size of a standard segwit input
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// as calculated above.
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FundingInputSize = InputSize
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// CommitmentDelayOutput 43 bytes
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// - Value: 8 bytes
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// - VarInt: 1 byte (PkScript length)
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// - PkScript (P2WSH)
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CommitmentDelayOutput = 8 + 1 + P2WSHSize
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// CommitmentKeyHashOutput 31 bytes
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// - Value: 8 bytes
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// - VarInt: 1 byte (PkScript length)
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// - PkScript (P2WPKH)
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CommitmentKeyHashOutput = 8 + 1 + P2WPKHSize
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// CommitmentAnchorOutput 43 bytes
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// - Value: 8 bytes
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// - VarInt: 1 byte (PkScript length)
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// - PkScript (P2WSH)
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CommitmentAnchorOutput = 8 + 1 + P2WSHSize
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// HTLCSize 43 bytes
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// - Value: 8 bytes
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// - VarInt: 1 byte (PkScript length)
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// - PkScript (PW2SH)
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HTLCSize = 8 + 1 + P2WSHSize
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// WitnessHeaderSize 2 bytes
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// - Flag: 1 byte
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// - Marker: 1 byte
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WitnessHeaderSize = 1 + 1
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// BaseTxSize 8 bytes
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// - Version: 4 bytes
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// - LockTime: 4 bytes
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BaseTxSize = 4 + 4
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// BaseCommitmentTxSize 125 + 43 * num-htlc-outputs bytes
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// - Version: 4 bytes
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// - WitnessHeader <---- part of the witness data
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// - CountTxIn: 1 byte
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// - TxIn: 41 bytes
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// FundingInput
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// - CountTxOut: 1 byte
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// - TxOut: 74 + 43 * num-htlc-outputs bytes
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// OutputPayingToThem,
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// OutputPayingToUs,
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// ....HTLCOutputs...
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// - LockTime: 4 bytes
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BaseCommitmentTxSize = 4 + 1 + FundingInputSize + 1 +
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CommitmentDelayOutput + CommitmentKeyHashOutput + 4
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// BaseCommitmentTxWeight 500 weight
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BaseCommitmentTxWeight = witnessScaleFactor * BaseCommitmentTxSize
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// WitnessCommitmentTxWeight 224 weight
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WitnessCommitmentTxWeight = WitnessHeaderSize + MultiSigWitnessSize
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// BaseAnchorCommitmentTxSize 225 + 43 * num-htlc-outputs bytes
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// - Version: 4 bytes
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// - WitnessHeader <---- part of the witness data
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// - CountTxIn: 1 byte
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// - TxIn: 41 bytes
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// FundingInput
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// - CountTxOut: 3 byte
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// - TxOut: 4*43 + 43 * num-htlc-outputs bytes
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// OutputPayingToThem,
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// OutputPayingToUs,
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// AnchorPayingToThem,
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// AnchorPayingToUs,
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// ....HTLCOutputs...
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// - LockTime: 4 bytes
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BaseAnchorCommitmentTxSize = 4 + 1 + FundingInputSize + 3 +
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2*CommitmentDelayOutput + 2*CommitmentAnchorOutput + 4
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// BaseAnchorCommitmentTxWeight 900 weight
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BaseAnchorCommitmentTxWeight = witnessScaleFactor * BaseAnchorCommitmentTxSize
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// CommitWeight 724 weight
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CommitWeight = BaseCommitmentTxWeight + WitnessCommitmentTxWeight
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// AnchorCommitWeight 1124 weight
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AnchorCommitWeight = BaseAnchorCommitmentTxWeight + WitnessCommitmentTxWeight
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// HTLCWeight 172 weight
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HTLCWeight = witnessScaleFactor * HTLCSize
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// HtlcTimeoutWeight is the weight of the HTLC timeout transaction
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// which will transition an outgoing HTLC to the delay-and-claim state.
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HtlcTimeoutWeight = 663
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// HtlcSuccessWeight is the weight of the HTLC success transaction
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// which will transition an incoming HTLC to the delay-and-claim state.
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HtlcSuccessWeight = 703
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// HtlcConfirmedScriptOverhead is the extra length of an HTLC script
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// that requires confirmation before it can be spent. These extra bytes
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// is a result of the extra CSV check.
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HtlcConfirmedScriptOverhead = 3
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// HtlcTimeoutWeightConfirmed is the weight of the HTLC timeout
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// transaction which will transition an outgoing HTLC to the
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// delay-and-claim state, for the confirmed HTLC outputs. It is 3 bytes
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// larger because of the additional CSV check in the input script.
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HtlcTimeoutWeightConfirmed = HtlcTimeoutWeight + HtlcConfirmedScriptOverhead
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// HtlcSuccessWeightCOnfirmed is the weight of the HTLC success
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// transaction which will transition an incoming HTLC to the
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// delay-and-claim state, for the confirmed HTLC outputs. It is 3 bytes
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// larger because of the cdditional CSV check in the input script.
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HtlcSuccessWeightConfirmed = HtlcSuccessWeight + HtlcConfirmedScriptOverhead
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// MaxHTLCNumber is the maximum number HTLCs which can be included in a
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// commitment transaction. This limit was chosen such that, in the case
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// of a contract breach, the punishment transaction is able to sweep
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// all the HTLC's yet still remain below the widely used standard
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// weight limits.
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MaxHTLCNumber = 966
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// ToLocalScriptSize 79 bytes
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// - OP_IF: 1 byte
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// - OP_DATA: 1 byte
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// - revoke_key: 33 bytes
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// - OP_ELSE: 1 byte
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// - OP_DATA: 1 byte
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// - csv_delay: 4 bytes
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// - OP_CHECKSEQUENCEVERIFY: 1 byte
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// - OP_DROP: 1 byte
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// - OP_DATA: 1 byte
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// - delay_key: 33 bytes
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// - OP_ENDIF: 1 byte
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// - OP_CHECKSIG: 1 byte
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ToLocalScriptSize = 1 + 1 + 33 + 1 + 1 + 4 + 1 + 1 + 1 + 33 + 1 + 1
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// ToLocalTimeoutWitnessSize 156 bytes
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// - number_of_witness_elements: 1 byte
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// - local_delay_sig_length: 1 byte
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// - local_delay_sig: 73 bytes
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// - zero_length: 1 byte
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// - witness_script_length: 1 byte
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// - witness_script (to_local_script)
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ToLocalTimeoutWitnessSize = 1 + 1 + 73 + 1 + 1 + ToLocalScriptSize
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// ToLocalPenaltyWitnessSize 157 bytes
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// - number_of_witness_elements: 1 byte
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// - revocation_sig_length: 1 byte
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// - revocation_sig: 73 bytes
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// - OP_TRUE_length: 1 byte
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// - OP_TRUE: 1 byte
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// - witness_script_length: 1 byte
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// - witness_script (to_local_script)
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ToLocalPenaltyWitnessSize = 1 + 1 + 73 + 1 + 1 + 1 + ToLocalScriptSize
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// ToRemoteConfirmedScriptSize 37 bytes
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// - OP_DATA: 1 byte
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// - to_remote_key: 33 bytes
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// - OP_CHECKSIGVERIFY: 1 byte
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// - OP_1: 1 byte
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// - OP_CHECKSEQUENCEVERIFY: 1 byte
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ToRemoteConfirmedScriptSize = 1 + 33 + 1 + 1 + 1
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// ToRemoteConfirmedWitnessSize 113 bytes
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// - number_of_witness_elements: 1 byte
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// - sig_length: 1 byte
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// - sig: 73 bytes
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// - witness_script_length: 1 byte
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// - witness_script (to_remote_delayed_script)
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ToRemoteConfirmedWitnessSize = 1 + 1 + 73 + 1 + ToRemoteConfirmedScriptSize
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// AcceptedHtlcScriptSize 143 bytes
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// - OP_DUP: 1 byte
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// - OP_HASH160: 1 byte
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// - OP_DATA: 1 byte (RIPEMD160(SHA256(revocationkey)) length)
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// - RIPEMD160(SHA256(revocationkey)): 20 bytes
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// - OP_EQUAL: 1 byte
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// - OP_IF: 1 byte
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// - OP_CHECKSIG: 1 byte
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// - OP_ELSE: 1 byte
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// - OP_DATA: 1 byte (remotekey length)
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// - remotekey: 33 bytes
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// - OP_SWAP: 1 byte
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// - OP_SIZE: 1 byte
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// - OP_DATA: 1 byte (32 length)
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// - 32: 1 byte
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// - OP_EQUAL: 1 byte
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// - OP_IF: 1 byte
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// - OP_HASH160: 1 byte
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// - OP_DATA: 1 byte (RIPEMD160(payment_hash) length)
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// - RIPEMD160(payment_hash): 20 bytes
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// - OP_EQUALVERIFY: 1 byte
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// - 2: 1 byte
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// - OP_SWAP: 1 byte
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// - OP_DATA: 1 byte (localkey length)
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// - localkey: 33 bytes
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// - 2: 1 byte
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// - OP_CHECKMULTISIG: 1 byte
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// - OP_ELSE: 1 byte
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// - OP_DROP: 1 byte
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// - OP_DATA: 1 byte (cltv_expiry length)
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// - cltv_expiry: 4 bytes
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// - OP_CHECKLOCKTIMEVERIFY: 1 byte
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// - OP_DROP: 1 byte
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// - OP_CHECKSIG: 1 byte
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// - OP_ENDIF: 1 byte
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// - OP_1: 1 byte // These 3 extra bytes are used for both confirmed and regular
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// - OP_CSV: 1 byte // HTLC script types. The size won't be correct in all cases,
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// - OP_DROP: 1 byte // but it is just an upper bound used for fee estimation in any case.
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// - OP_ENDIF: 1 byte
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AcceptedHtlcScriptSize = 3*1 + 20 + 5*1 + 33 + 8*1 + 20 + 4*1 +
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33 + 5*1 + 4 + 8*1
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// AcceptedHtlcScriptSizeConfirmed 143 bytes
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//
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// TODO(halseth): the non-confirmed version currently includes the
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// overhead.
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AcceptedHtlcScriptSizeConfirmed = AcceptedHtlcScriptSize // + HtlcConfirmedScriptOverhead
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// AcceptedHtlcTimeoutWitnessSize 219
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// - number_of_witness_elements: 1 byte
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// - sender_sig_length: 1 byte
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// - sender_sig: 73 bytes
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// - nil_length: 1 byte
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// - witness_script_length: 1 byte
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// - witness_script: (accepted_htlc_script)
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AcceptedHtlcTimeoutWitnessSize = 1 + 1 + 73 + 1 + 1 + AcceptedHtlcScriptSize
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// AcceptedHtlcPenaltyWitnessSize 252 bytes
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// - number_of_witness_elements: 1 byte
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// - revocation_sig_length: 1 byte
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// - revocation_sig: 73 bytes
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// - revocation_key_length: 1 byte
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// - revocation_key: 33 bytes
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// - witness_script_length: 1 byte
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// - witness_script (accepted_htlc_script)
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AcceptedHtlcPenaltyWitnessSize = 1 + 1 + 73 + 1 + 33 + 1 + AcceptedHtlcScriptSize
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// AcceptedHtlcSuccessWitnessSize 322 bytes
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// - number_of_witness_elements: 1 byte
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// - nil_length: 1 byte
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// - sig_alice_length: 1 byte
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// - sig_alice: 73 bytes
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// - sig_bob_length: 1 byte
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// - sig_bob: 73 bytes
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// - preimage_length: 1 byte
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// - preimage: 32 bytes
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// - witness_script_length: 1 byte
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// - witness_script (accepted_htlc_script)
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AcceptedHtlcSuccessWitnessSize = 1 + 1 + 1 + 73 + 1 + 73 + 1 + 32 + 1 +
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AcceptedHtlcScriptSize
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// AcceptedHtlcSuccessWitnessSizeConfirmed 327 bytes
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//
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// Input to second level success tx, spending 1 CSV delayed HTLC output.
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AcceptedHtlcSuccessWitnessSizeConfirmed = 1 + 1 + 1 + 73 + 1 + 73 + 1 + 32 + 1 +
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AcceptedHtlcScriptSizeConfirmed
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// OfferedHtlcScriptSize 136 bytes
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// - OP_DUP: 1 byte
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// - OP_HASH160: 1 byte
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// - OP_DATA: 1 byte (RIPEMD160(SHA256(revocationkey)) length)
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// - RIPEMD160(SHA256(revocationkey)): 20 bytes
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// - OP_EQUAL: 1 byte
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// - OP_IF: 1 byte
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// - OP_CHECKSIG: 1 byte
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// - OP_ELSE: 1 byte
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// - OP_DATA: 1 byte (remotekey length)
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// - remotekey: 33 bytes
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// - OP_SWAP: 1 byte
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// - OP_SIZE: 1 byte
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// - OP_DATA: 1 byte (32 length)
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// - 32: 1 byte
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// - OP_EQUAL: 1 byte
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// - OP_NOTIF: 1 byte
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// - OP_DROP: 1 byte
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// - 2: 1 byte
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// - OP_SWAP: 1 byte
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// - OP_DATA: 1 byte (localkey length)
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// - localkey: 33 bytes
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// - 2: 1 byte
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// - OP_CHECKMULTISIG: 1 byte
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// - OP_ELSE: 1 byte
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// - OP_HASH160: 1 byte
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// - OP_DATA: 1 byte (RIPEMD160(payment_hash) length)
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// - RIPEMD160(payment_hash): 20 bytes
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// - OP_EQUALVERIFY: 1 byte
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// - OP_CHECKSIG: 1 byte
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// - OP_ENDIF: 1 byte
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// - OP_1: 1 byte
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// - OP_CSV: 1 byte
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// - OP_DROP: 1 byte
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// - OP_ENDIF: 1 byte
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OfferedHtlcScriptSize = 3*1 + 20 + 5*1 + 33 + 10*1 + 33 + 5*1 + 20 + 7*1
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// OfferedHtlcScriptSizeConfirmed 136 bytes
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//
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// TODO(halseth): the non-confirmed version currently includes the
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// overhead.
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OfferedHtlcScriptSizeConfirmed = OfferedHtlcScriptSize // + HtlcConfirmedScriptOverhead
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// OfferedHtlcSuccessWitnessSize 245 bytes
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// - number_of_witness_elements: 1 byte
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// - receiver_sig_length: 1 byte
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// - receiver_sig: 73 bytes
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// - payment_preimage_length: 1 byte
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// - payment_preimage: 32 bytes
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// - witness_script_length: 1 byte
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// - witness_script (offered_htlc_script)
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OfferedHtlcSuccessWitnessSize = 1 + 1 + 73 + 1 + 32 + 1 + OfferedHtlcScriptSize
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// OfferedHtlcTimeoutWitnessSize 285 bytes
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// - number_of_witness_elements: 1 byte
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// - nil_length: 1 byte
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// - sig_alice_length: 1 byte
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// - sig_alice: 73 bytes
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// - sig_bob_length: 1 byte
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// - sig_bob: 73 bytes
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// - nil_length: 1 byte
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// - witness_script_length: 1 byte
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// - witness_script (offered_htlc_script)
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OfferedHtlcTimeoutWitnessSize = 1 + 1 + 1 + 73 + 1 + 73 + 1 + 1 + OfferedHtlcScriptSize
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// OfferedHtlcTimeoutWitnessSizeConfirmed 288 bytes
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//
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// Input to second level timeout tx, spending 1 CSV delayed HTLC output.
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OfferedHtlcTimeoutWitnessSizeConfirmed = 1 + 1 + 1 + 73 + 1 + 73 + 1 + 1 +
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OfferedHtlcScriptSizeConfirmed
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// OfferedHtlcPenaltyWitnessSize 246 bytes
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// - number_of_witness_elements: 1 byte
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// - revocation_sig_length: 1 byte
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// - revocation_sig: 73 bytes
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// - revocation_key_length: 1 byte
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// - revocation_key: 33 bytes
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// - witness_script_length: 1 byte
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// - witness_script (offered_htlc_script)
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OfferedHtlcPenaltyWitnessSize = 1 + 1 + 73 + 1 + 33 + 1 + OfferedHtlcScriptSize
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// AnchorScriptSize 40 bytes
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// - pubkey_length: 1 byte
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// - pubkey: 33 bytes
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// - OP_CHECKSIG: 1 byte
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// - OP_IFDUP: 1 byte
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// - OP_NOTIF: 1 byte
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|
// - OP_16: 1 byte
|
|
// - OP_CSV 1 byte
|
|
// - OP_ENDIF: 1 byte
|
|
AnchorScriptSize = 1 + 33 + 6*1
|
|
|
|
// AnchorWitnessSize 116 bytes
|
|
// - number_of_witnes_elements: 1 byte
|
|
// - signature_length: 1 byte
|
|
// - signature: 73 bytes
|
|
// - witness_script_length: 1 byte
|
|
// - witness_script (anchor_script)
|
|
AnchorWitnessSize = 1 + 1 + 73 + 1 + AnchorScriptSize
|
|
)
|
|
|
|
// EstimateCommitTxWeight estimate commitment transaction weight depending on
|
|
// the precalculated weight of base transaction, witness data, which is needed
|
|
// for paying for funding tx, and htlc weight multiplied by their count.
|
|
func EstimateCommitTxWeight(count int, prediction bool) int64 {
|
|
// Make prediction about the size of commitment transaction with
|
|
// additional HTLC.
|
|
if prediction {
|
|
count++
|
|
}
|
|
|
|
htlcWeight := int64(count * HTLCWeight)
|
|
baseWeight := int64(BaseCommitmentTxWeight)
|
|
witnessWeight := int64(WitnessCommitmentTxWeight)
|
|
|
|
return htlcWeight + baseWeight + witnessWeight
|
|
}
|
|
|
|
// TxWeightEstimator is able to calculate weight estimates for transactions
|
|
// based on the input and output types. For purposes of estimation, all
|
|
// signatures are assumed to be of the maximum possible size, 73 bytes. Each
|
|
// method of the estimator returns an instance with the estimate applied. This
|
|
// allows callers to chain each of the methods
|
|
type TxWeightEstimator struct {
|
|
hasWitness bool
|
|
inputCount uint32
|
|
outputCount uint32
|
|
inputSize int
|
|
inputWitnessSize int
|
|
outputSize int
|
|
}
|
|
|
|
// AddP2PKHInput updates the weight estimate to account for an additional input
|
|
// spending a P2PKH output.
|
|
func (twe *TxWeightEstimator) AddP2PKHInput() *TxWeightEstimator {
|
|
twe.inputSize += InputSize + P2PKHScriptSigSize
|
|
twe.inputWitnessSize++
|
|
twe.inputCount++
|
|
|
|
return twe
|
|
}
|
|
|
|
// AddP2WKHInput updates the weight estimate to account for an additional input
|
|
// spending a native P2PWKH output.
|
|
func (twe *TxWeightEstimator) AddP2WKHInput() *TxWeightEstimator {
|
|
twe.AddWitnessInput(P2WKHWitnessSize)
|
|
|
|
return twe
|
|
}
|
|
|
|
// AddWitnessInput updates the weight estimate to account for an additional
|
|
// input spending a native pay-to-witness output. This accepts the total size
|
|
// of the witness as a parameter.
|
|
func (twe *TxWeightEstimator) AddWitnessInput(witnessSize int) *TxWeightEstimator {
|
|
twe.inputSize += InputSize
|
|
twe.inputWitnessSize += witnessSize
|
|
twe.inputCount++
|
|
twe.hasWitness = true
|
|
|
|
return twe
|
|
}
|
|
|
|
// AddNestedP2WKHInput updates the weight estimate to account for an additional
|
|
// input spending a P2SH output with a nested P2WKH redeem script.
|
|
func (twe *TxWeightEstimator) AddNestedP2WKHInput() *TxWeightEstimator {
|
|
twe.inputSize += InputSize + NestedP2WPKHSize
|
|
twe.inputWitnessSize += P2WKHWitnessSize
|
|
twe.inputCount++
|
|
twe.hasWitness = true
|
|
|
|
return twe
|
|
}
|
|
|
|
// AddNestedP2WSHInput updates the weight estimate to account for an additional
|
|
// input spending a P2SH output with a nested P2WSH redeem script.
|
|
func (twe *TxWeightEstimator) AddNestedP2WSHInput(witnessSize int) *TxWeightEstimator {
|
|
twe.inputSize += InputSize + NestedP2WSHSize
|
|
twe.inputWitnessSize += witnessSize
|
|
twe.inputCount++
|
|
twe.hasWitness = true
|
|
|
|
return twe
|
|
}
|
|
|
|
// AddTxOutput adds a known TxOut to the weight estimator.
|
|
func (twe *TxWeightEstimator) AddTxOutput(txOut *wire.TxOut) *TxWeightEstimator {
|
|
twe.outputSize += txOut.SerializeSize()
|
|
twe.outputCount++
|
|
|
|
return twe
|
|
}
|
|
|
|
// AddP2PKHOutput updates the weight estimate to account for an additional P2PKH
|
|
// output.
|
|
func (twe *TxWeightEstimator) AddP2PKHOutput() *TxWeightEstimator {
|
|
twe.outputSize += P2PKHOutputSize
|
|
twe.outputCount++
|
|
|
|
return twe
|
|
}
|
|
|
|
// AddP2WKHOutput updates the weight estimate to account for an additional
|
|
// native P2WKH output.
|
|
func (twe *TxWeightEstimator) AddP2WKHOutput() *TxWeightEstimator {
|
|
twe.outputSize += P2WKHOutputSize
|
|
twe.outputCount++
|
|
|
|
return twe
|
|
}
|
|
|
|
// AddP2WSHOutput updates the weight estimate to account for an additional
|
|
// native P2WSH output.
|
|
func (twe *TxWeightEstimator) AddP2WSHOutput() *TxWeightEstimator {
|
|
twe.outputSize += P2WSHOutputSize
|
|
twe.outputCount++
|
|
|
|
return twe
|
|
}
|
|
|
|
// AddP2SHOutput updates the weight estimate to account for an additional P2SH
|
|
// output.
|
|
func (twe *TxWeightEstimator) AddP2SHOutput() *TxWeightEstimator {
|
|
twe.outputSize += P2SHOutputSize
|
|
twe.outputCount++
|
|
|
|
return twe
|
|
}
|
|
|
|
// Weight gets the estimated weight of the transaction.
|
|
func (twe *TxWeightEstimator) Weight() int {
|
|
txSizeStripped := BaseTxSize +
|
|
wire.VarIntSerializeSize(uint64(twe.inputCount)) + twe.inputSize +
|
|
wire.VarIntSerializeSize(uint64(twe.outputCount)) + twe.outputSize
|
|
weight := txSizeStripped * witnessScaleFactor
|
|
if twe.hasWitness {
|
|
weight += WitnessHeaderSize + twe.inputWitnessSize
|
|
}
|
|
return weight
|
|
}
|
|
|
|
// VSize gets the estimated virtual size of the transactions, in vbytes.
|
|
func (twe *TxWeightEstimator) VSize() int {
|
|
// A tx's vsize is 1/4 of the weight, rounded up.
|
|
return (twe.Weight() + witnessScaleFactor - 1) / witnessScaleFactor
|
|
}
|