Golang MsgTx.AddTxOut方法代碼示例

// addChange adds a new output with the given amount and address, and
// randomizes the index (and returns it) of the newly added output.
func addChange(msgtx *wire.MsgTx, change btcutil.Amount, changeAddr btcutil.Address) (int, error) {
	pkScript, err := txscript.PayToAddrScript(changeAddr)
	if err != nil {
		return 0, fmt.Errorf("cannot create txout script: %s", err)
	}
	msgtx.AddTxOut(wire.NewTxOut(int64(change), pkScript))

	// Randomize index of the change output.
	rng := badrand.New(badrand.NewSource(time.Now().UnixNano()))
	r := rng.Int31n(int32(len(msgtx.TxOut))) // random index
	c := len(msgtx.TxOut) - 1                // change index
	msgtx.TxOut[r], msgtx.TxOut[c] = msgtx.TxOut[c], msgtx.TxOut[r]
	return int(r), nil
}

// addHTLC...
// NOTE: This MUST be called with stateMtx held.
func (lc *LightningChannel) addHTLC(ourCommitTx, theirCommitTx *wire.MsgTx,
	paymentDesc *PaymentDescriptor) error {

	// If the HTLC is going to us, then we're the sender, otherwise they
	// are.
	var senderKey, receiverKey *btcec.PublicKey
	var senderRevocation, receiverRevocation []byte
	if paymentDesc.PayToUs {
		receiverKey = lc.channelState.OurCommitKey.PubKey()
		receiverRevocation = paymentDesc.OurRevocation[:]
		senderKey = lc.channelState.TheirCommitKey
		senderRevocation = paymentDesc.TheirRevocation[:]
	} else {
		senderKey = lc.channelState.OurCommitKey.PubKey()
		senderRevocation = paymentDesc.OurRevocation[:]
		receiverKey = lc.channelState.TheirCommitKey
		receiverRevocation = paymentDesc.TheirRevocation[:]
	}

	// Generate the proper redeem scripts for the HTLC output for both the
	// sender and the receiver.
	timeout := paymentDesc.Timeout
	rHash := paymentDesc.RHash
	delay := lc.channelState.CsvDelay
	senderPKScript, err := senderHTLCScript(timeout, delay, senderKey,
		receiverKey, senderRevocation[:], rHash[:])
	if err != nil {
		return nil
	}
	receiverPKScript, err := receiverHTLCScript(timeout, delay, senderKey,
		receiverKey, receiverRevocation[:], rHash[:])
	if err != nil {
		return nil
	}

	// Now that we have the redeem scripts, create the P2SH public key
	// script for each.
	senderP2SH, err := scriptHashPkScript(senderPKScript)
	if err != nil {
		return nil
	}
	receiverP2SH, err := scriptHashPkScript(receiverPKScript)
	if err != nil {
		return nil
	}

	// Add the new HTLC outputs to the respective commitment transactions.
	amountPending := int64(paymentDesc.Value)
	if paymentDesc.PayToUs {
		ourCommitTx.AddTxOut(wire.NewTxOut(amountPending, receiverP2SH))
		theirCommitTx.AddTxOut(wire.NewTxOut(amountPending, senderP2SH))
	} else {
		ourCommitTx.AddTxOut(wire.NewTxOut(amountPending, senderP2SH))
		theirCommitTx.AddTxOut(wire.NewTxOut(amountPending, receiverP2SH))
	}

	return nil
}

// addOutputs adds the given address/amount pairs as outputs to msgtx,
// returning their total amount.
func addOutputs(msgtx *wire.MsgTx, pairs map[string]btcutil.Amount, chainParams *chaincfg.Params) (btcutil.Amount, error) {
	var minAmount btcutil.Amount
	for addrStr, amt := range pairs {
		if amt <= 0 {
			return minAmount, ErrNonPositiveAmount
		}
		minAmount += amt
		addr, err := btcutil.DecodeAddress(addrStr, chainParams)
		if err != nil {
			return minAmount, fmt.Errorf("cannot decode address: %s", err)
		}

		// Add output to spend amt to addr.
		pkScript, err := txscript.PayToAddrScript(addr)
		if err != nil {
			return minAmount, fmt.Errorf("cannot create txout script: %s", err)
		}
		txout := wire.NewTxOut(int64(amt), pkScript)
		msgtx.AddTxOut(txout)
	}
	return minAmount, nil
}

//.........這裏部分代碼省略.........

		newheight, err := db.InsertBlock(block)
		if err != nil {
			t.Errorf("failed to insert block %v err %v", height, err)
			break out
		}
		if newheight != height {
			t.Errorf("height mismatch expect %v returned %v", height, newheight)
			break out
		}

		newSha, blkid, err := db.NewestSha()
		if err != nil {
			t.Errorf("failed to obtain latest sha %v %v", height, err)
		}

		if blkid != height {
			t.Errorf("height doe not match latest block height %v %v %v", blkid, height, err)
		}

		blkSha := block.Sha()
		if *newSha != *blkSha {
			t.Errorf("Newest block sha does not match freshly inserted one %v %v %v ", newSha, blkSha, err)
		}
		lastSha = blkSha
	}

	// generate a new block based on the last sha
	// these block are not verified, so there are a bunch of garbage fields
	// in the 'generated' block.

	var bh wire.BlockHeader

	bh.Version = 2
	bh.PrevBlock = *lastSha
	// Bits, Nonce are not filled in

	mblk := wire.NewMsgBlock(&bh)

	hash, _ := wire.NewShaHashFromStr("df2b060fa2e5e9c8ed5eaf6a45c13753ec8c63282b2688322eba40cd98ea067a")

	po := wire.NewOutPoint(hash, 0)
	txI := wire.NewTxIn(po, []byte("garbage"))
	txO := wire.NewTxOut(50000000, []byte("garbageout"))

	var tx wire.MsgTx
	tx.AddTxIn(txI)
	tx.AddTxOut(txO)

	mblk.AddTransaction(&tx)

	blk := btcutil.NewBlock(mblk)

	fetchList := []*wire.ShaHash{hash}
	listReply := db.FetchUnSpentTxByShaList(fetchList)
	for _, lr := range listReply {
		if lr.Err != nil {
			t.Errorf("sha %v spent %v err %v\n", lr.Sha,
				lr.TxSpent, lr.Err)
		}
	}

	_, err = db.InsertBlock(blk)
	if err != nil {
		t.Errorf("failed to insert phony block %v", err)
	}

	// ok, did it 'spend' the tx ?

	listReply = db.FetchUnSpentTxByShaList(fetchList)
	for _, lr := range listReply {
		if lr.Err != database.ErrTxShaMissing {
			t.Errorf("sha %v spent %v err %v\n", lr.Sha,
				lr.TxSpent, lr.Err)
		}
	}

	txlist := blk.Transactions()
	for _, tx := range txlist {
		txsha := tx.Sha()
		txReply, err := db.FetchTxBySha(txsha)
		if err != nil {
			t.Errorf("fully spent lookup %v err %v\n", hash, err)
		} else {
			for _, lr := range txReply {
				if lr.Err != nil {
					t.Errorf("stx %v spent %v err %v\n", lr.Sha,
						lr.TxSpent, lr.Err)
				}
			}
		}
	}

	t.Logf("Dropping block")

	err = db.DropAfterBlockBySha(lastSha)
	if err != nil {
		t.Errorf("failed to drop spending block %v", err)
	}
}

// fundTx attempts to fund a transaction sending amt bitcoin. The coins are
// selected such that the final amount spent pays enough fees as dictated by
// the passed fee rate. The passed fee rate should be expressed in
// satoshis-per-byte.
//
// NOTE: The memWallet's mutex must be held when this function is called.
func (m *memWallet) fundTx(tx *wire.MsgTx, amt btcutil.Amount, feeRate btcutil.Amount) error {
	const (
		// spendSize is the largest number of bytes of a sigScript
		// which spends a p2pkh output: OP_DATA_73 <sig> OP_DATA_33 <pubkey>
		spendSize = 1 + 73 + 1 + 33
	)

	var (
		amtSelected btcutil.Amount
		txSize      int
	)

	for outPoint, utxo := range m.utxos {
		// Skip any outputs that are still currently immature or are
		// currently locked.
		if !utxo.isMature(m.currentHeight) || utxo.isLocked {
			continue
		}

		amtSelected += utxo.value

		// Add the selected output to the transaction, updating the
		// current tx size while accounting for the size of the future
		// sigScript.
		tx.AddTxIn(wire.NewTxIn(&outPoint, nil))
		txSize = tx.SerializeSize() + spendSize*len(tx.TxIn)

		// Calculate the fee required for the txn at this point
		// observing the specified fee rate. If we don't have enough
		// coins from he current amount selected to pay the fee, then
		// continue to grab more coins.
		reqFee := btcutil.Amount(txSize * int(feeRate))
		if amtSelected-reqFee < amt {
			continue
		}

		// If we have any change left over, then add an additional
		// output to the transaction reserved for change.
		changeVal := amtSelected - amt - reqFee
		if changeVal > 0 {
			addr, err := m.newAddress()
			if err != nil {
				return err
			}
			pkScript, err := txscript.PayToAddrScript(addr)
			if err != nil {
				return err
			}
			changeOutput := &wire.TxOut{
				Value:    int64(changeVal),
				PkScript: pkScript,
			}
			tx.AddTxOut(changeOutput)
		}

		return nil
	}

	// If we've reached this point, then coin selection failed due to an
	// insufficient amount of coins.
	return fmt.Errorf("not enough funds for coin selection")
}