e92f94dcd1
This updates all code to make use of the new chainhash package since the old wire.ShaHash type and related functions have been removed in favor of the abstracted package. Also, while here, rename all variables that included sha in their name to include hash instead. Finally, update glide.lock to use the required version of btcd, btcutil, and btcrpcclient.
463 lines
14 KiB
Go
463 lines
14 KiB
Go
// Copyright (c) 2015 The btcsuite developers
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// Use of this source code is governed by an ISC
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// license that can be found in the LICENSE file.
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package wtxmgr
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import (
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"fmt"
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"github.com/btcsuite/btcd/chaincfg/chainhash"
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"github.com/btcsuite/btcutil"
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"github.com/btcsuite/btcwallet/walletdb"
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)
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// CreditRecord contains metadata regarding a transaction credit for a known
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// transaction. Further details may be looked up by indexing a wire.MsgTx.TxOut
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// with the Index field.
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type CreditRecord struct {
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Amount btcutil.Amount
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Index uint32
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Spent bool
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Change bool
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}
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// DebitRecord contains metadata regarding a transaction debit for a known
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// transaction. Further details may be looked up by indexing a wire.MsgTx.TxIn
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// with the Index field.
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type DebitRecord struct {
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Amount btcutil.Amount
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Index uint32
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}
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// TxDetails is intended to provide callers with access to rich details
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// regarding a relevant transaction and which inputs and outputs are credit or
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// debits.
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type TxDetails struct {
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TxRecord
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Block BlockMeta
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Credits []CreditRecord
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Debits []DebitRecord
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}
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// minedTxDetails fetches the TxDetails for the mined transaction with hash
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// txHash and the passed tx record key and value.
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func (s *Store) minedTxDetails(ns walletdb.Bucket, txHash *chainhash.Hash, recKey, recVal []byte) (*TxDetails, error) {
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var details TxDetails
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// Parse transaction record k/v, lookup the full block record for the
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// block time, and read all matching credits, debits.
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err := readRawTxRecord(txHash, recVal, &details.TxRecord)
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if err != nil {
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return nil, err
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}
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err = readRawTxRecordBlock(recKey, &details.Block.Block)
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if err != nil {
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return nil, err
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}
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details.Block.Time, err = fetchBlockTime(ns, details.Block.Height)
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if err != nil {
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return nil, err
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}
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credIter := makeCreditIterator(ns, recKey)
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for credIter.next() {
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if int(credIter.elem.Index) >= len(details.MsgTx.TxOut) {
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str := "saved credit index exceeds number of outputs"
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return nil, storeError(ErrData, str, nil)
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}
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// The credit iterator does not record whether this credit was
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// spent by an unmined transaction, so check that here.
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if !credIter.elem.Spent {
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k := canonicalOutPoint(txHash, credIter.elem.Index)
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spent := existsRawUnminedInput(ns, k) != nil
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credIter.elem.Spent = spent
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}
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details.Credits = append(details.Credits, credIter.elem)
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}
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if credIter.err != nil {
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return nil, credIter.err
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}
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debIter := makeDebitIterator(ns, recKey)
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for debIter.next() {
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if int(debIter.elem.Index) >= len(details.MsgTx.TxIn) {
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str := "saved debit index exceeds number of inputs"
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return nil, storeError(ErrData, str, nil)
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}
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details.Debits = append(details.Debits, debIter.elem)
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}
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return &details, debIter.err
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}
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// unminedTxDetails fetches the TxDetails for the unmined transaction with the
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// hash txHash and the passed unmined record value.
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func (s *Store) unminedTxDetails(ns walletdb.Bucket, txHash *chainhash.Hash, v []byte) (*TxDetails, error) {
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details := TxDetails{
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Block: BlockMeta{Block: Block{Height: -1}},
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}
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err := readRawTxRecord(txHash, v, &details.TxRecord)
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if err != nil {
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return nil, err
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}
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it := makeUnminedCreditIterator(ns, txHash)
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for it.next() {
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if int(it.elem.Index) >= len(details.MsgTx.TxOut) {
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str := "saved credit index exceeds number of outputs"
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return nil, storeError(ErrData, str, nil)
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}
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// Set the Spent field since this is not done by the iterator.
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it.elem.Spent = existsRawUnminedInput(ns, it.ck) != nil
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details.Credits = append(details.Credits, it.elem)
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}
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if it.err != nil {
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return nil, it.err
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}
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// Debit records are not saved for unmined transactions. Instead, they
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// must be looked up for each transaction input manually. There are two
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// kinds of previous credits that may be debited by an unmined
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// transaction: mined unspent outputs (which remain marked unspent even
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// when spent by an unmined transaction), and credits from other unmined
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// transactions. Both situations must be considered.
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for i, output := range details.MsgTx.TxIn {
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opKey := canonicalOutPoint(&output.PreviousOutPoint.Hash,
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output.PreviousOutPoint.Index)
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credKey := existsRawUnspent(ns, opKey)
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if credKey != nil {
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v := existsRawCredit(ns, credKey)
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amount, err := fetchRawCreditAmount(v)
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if err != nil {
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return nil, err
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}
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details.Debits = append(details.Debits, DebitRecord{
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Amount: amount,
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Index: uint32(i),
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})
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continue
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}
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v := existsRawUnminedCredit(ns, opKey)
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if v == nil {
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continue
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}
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amount, err := fetchRawCreditAmount(v)
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if err != nil {
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return nil, err
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}
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details.Debits = append(details.Debits, DebitRecord{
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Amount: amount,
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Index: uint32(i),
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})
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}
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return &details, nil
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}
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// TxDetails looks up all recorded details regarding a transaction with some
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// hash. In case of a hash collision, the most recent transaction with a
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// matching hash is returned.
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//
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// Not finding a transaction with this hash is not an error. In this case,
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// a nil TxDetails is returned.
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func (s *Store) TxDetails(txHash *chainhash.Hash) (*TxDetails, error) {
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var details *TxDetails
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err := scopedView(s.namespace, func(ns walletdb.Bucket) error {
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var err error
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// First, check whether there exists an unmined transaction with this
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// hash. Use it if found.
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v := existsRawUnmined(ns, txHash[:])
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if v != nil {
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details, err = s.unminedTxDetails(ns, txHash, v)
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return err
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}
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// Otherwise, if there exists a mined transaction with this matching
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// hash, skip over to the newest and begin fetching all details.
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k, v := latestTxRecord(ns, txHash)
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if v == nil {
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// not found
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return nil
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}
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details, err = s.minedTxDetails(ns, txHash, k, v)
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return err
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})
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return details, err
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}
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// UniqueTxDetails looks up all recorded details for a transaction recorded
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// mined in some particular block, or an unmined transaction if block is nil.
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//
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// Not finding a transaction with this hash from this block is not an error. In
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// this case, a nil TxDetails is returned.
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func (s *Store) UniqueTxDetails(txHash *chainhash.Hash, block *Block) (*TxDetails, error) {
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var details *TxDetails
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err := scopedView(s.namespace, func(ns walletdb.Bucket) error {
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var err error
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if block == nil {
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v := existsRawUnmined(ns, txHash[:])
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if v == nil {
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return nil
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}
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details, err = s.unminedTxDetails(ns, txHash, v)
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return err
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}
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k, v := existsTxRecord(ns, txHash, block)
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if v == nil {
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return nil
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}
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details, err = s.minedTxDetails(ns, txHash, k, v)
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return err
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})
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return details, err
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}
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// rangeUnminedTransactions executes the function f with TxDetails for every
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// unmined transaction. f is not executed if no unmined transactions exist.
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// Error returns from f (if any) are propigated to the caller. Returns true
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// (signaling breaking out of a RangeTransactions) iff f executes and returns
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// true.
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func (s *Store) rangeUnminedTransactions(ns walletdb.Bucket, f func([]TxDetails) (bool, error)) (bool, error) {
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var details []TxDetails
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err := ns.Bucket(bucketUnmined).ForEach(func(k, v []byte) error {
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if len(k) < 32 {
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str := fmt.Sprintf("%s: short key (expected %d "+
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"bytes, read %d)", bucketUnmined, 32, len(k))
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return storeError(ErrData, str, nil)
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}
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var txHash chainhash.Hash
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copy(txHash[:], k)
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detail, err := s.unminedTxDetails(ns, &txHash, v)
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if err != nil {
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return err
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}
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// Because the key was created while foreach-ing over the
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// bucket, it should be impossible for unminedTxDetails to ever
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// successfully return a nil details struct.
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details = append(details, *detail)
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return nil
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})
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if err == nil && len(details) > 0 {
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return f(details)
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}
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return false, err
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}
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// rangeBlockTransactions executes the function f with TxDetails for every block
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// between heights begin and end (reverse order when end > begin) until f
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// returns true, or the transactions from block is processed. Returns true iff
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// f executes and returns true.
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func (s *Store) rangeBlockTransactions(ns walletdb.Bucket, begin, end int32, f func([]TxDetails) (bool, error)) (bool, error) {
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// Mempool height is considered a high bound.
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if begin < 0 {
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begin = int32(^uint32(0) >> 1)
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}
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if end < 0 {
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end = int32(^uint32(0) >> 1)
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}
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var blockIter blockIterator
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var advance func(*blockIterator) bool
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if begin < end {
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// Iterate in forwards order
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blockIter = makeBlockIterator(ns, begin)
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advance = func(it *blockIterator) bool {
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if !it.next() {
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return false
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}
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return it.elem.Height <= end
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}
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} else {
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// Iterate in backwards order, from begin -> end.
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blockIter = makeBlockIterator(ns, begin)
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advance = func(it *blockIterator) bool {
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if !it.prev() {
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return false
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}
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return end <= it.elem.Height
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}
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}
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var details []TxDetails
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for advance(&blockIter) {
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block := &blockIter.elem
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if cap(details) < len(block.transactions) {
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details = make([]TxDetails, 0, len(block.transactions))
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} else {
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details = details[:0]
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}
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for _, txHash := range block.transactions {
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k := keyTxRecord(&txHash, &block.Block)
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v := existsRawTxRecord(ns, k)
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if v == nil {
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str := fmt.Sprintf("missing transaction %v for "+
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"block %v", txHash, block.Height)
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return false, storeError(ErrData, str, nil)
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}
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detail := TxDetails{
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Block: BlockMeta{
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Block: block.Block,
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Time: block.Time,
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},
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}
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err := readRawTxRecord(&txHash, v, &detail.TxRecord)
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if err != nil {
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return false, err
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}
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credIter := makeCreditIterator(ns, k)
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for credIter.next() {
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if int(credIter.elem.Index) >= len(detail.MsgTx.TxOut) {
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str := "saved credit index exceeds number of outputs"
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return false, storeError(ErrData, str, nil)
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}
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// The credit iterator does not record whether
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// this credit was spent by an unmined
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// transaction, so check that here.
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if !credIter.elem.Spent {
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k := canonicalOutPoint(&txHash, credIter.elem.Index)
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spent := existsRawUnminedInput(ns, k) != nil
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credIter.elem.Spent = spent
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}
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detail.Credits = append(detail.Credits, credIter.elem)
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}
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if credIter.err != nil {
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return false, credIter.err
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}
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debIter := makeDebitIterator(ns, k)
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for debIter.next() {
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if int(debIter.elem.Index) >= len(detail.MsgTx.TxIn) {
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str := "saved debit index exceeds number of inputs"
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return false, storeError(ErrData, str, nil)
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}
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detail.Debits = append(detail.Debits, debIter.elem)
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}
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if debIter.err != nil {
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return false, debIter.err
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}
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details = append(details, detail)
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}
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// Every block record must have at least one transaction, so it
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// is safe to call f.
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brk, err := f(details)
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if err != nil || brk {
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return brk, err
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}
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}
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return false, blockIter.err
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}
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// RangeTransactions runs the function f on all transaction details between
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// blocks on the best chain over the height range [begin,end]. The special
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// height -1 may be used to also include unmined transactions. If the end
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// height comes before the begin height, blocks are iterated in reverse order
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// and unmined transactions (if any) are processed first.
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//
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// The function f may return an error which, if non-nil, is propagated to the
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// caller. Additionally, a boolean return value allows exiting the function
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// early without reading any additional transactions early when true.
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//
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// All calls to f are guaranteed to be passed a slice with more than zero
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// elements. The slice may be reused for multiple blocks, so it is not safe to
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// use it after the loop iteration it was acquired.
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func (s *Store) RangeTransactions(begin, end int32, f func([]TxDetails) (bool, error)) error {
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return scopedView(s.namespace, func(ns walletdb.Bucket) error {
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var addedUnmined bool
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if begin < 0 {
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brk, err := s.rangeUnminedTransactions(ns, f)
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if err != nil || brk {
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return err
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}
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addedUnmined = true
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}
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brk, err := s.rangeBlockTransactions(ns, begin, end, f)
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if err == nil && !brk && !addedUnmined && end < 0 {
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_, err = s.rangeUnminedTransactions(ns, f)
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}
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return err
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})
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}
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// PreviousPkScripts returns a slice of previous output scripts for each credit
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// output this transaction record debits from.
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func (s *Store) PreviousPkScripts(rec *TxRecord, block *Block) ([][]byte, error) {
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var pkScripts [][]byte
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err := scopedView(s.namespace, func(ns walletdb.Bucket) error {
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if block == nil {
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for _, input := range rec.MsgTx.TxIn {
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prevOut := &input.PreviousOutPoint
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// Input may spend a previous unmined output, a
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// mined output (which would still be marked
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// unspent), or neither.
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v := existsRawUnmined(ns, prevOut.Hash[:])
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if v != nil {
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// Ensure a credit exists for this
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// unmined transaction before including
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// the output script.
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k := canonicalOutPoint(&prevOut.Hash, prevOut.Index)
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if existsRawUnminedCredit(ns, k) == nil {
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continue
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}
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pkScript, err := fetchRawTxRecordPkScript(
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prevOut.Hash[:], v, prevOut.Index)
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if err != nil {
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return err
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}
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pkScripts = append(pkScripts, pkScript)
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continue
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}
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_, credKey := existsUnspent(ns, prevOut)
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if credKey != nil {
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k := extractRawCreditTxRecordKey(credKey)
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v = existsRawTxRecord(ns, k)
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pkScript, err := fetchRawTxRecordPkScript(k, v,
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prevOut.Index)
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if err != nil {
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return err
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}
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pkScripts = append(pkScripts, pkScript)
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}
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}
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return nil
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}
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recKey := keyTxRecord(&rec.Hash, block)
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it := makeDebitIterator(ns, recKey)
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for it.next() {
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credKey := extractRawDebitCreditKey(it.cv)
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index := extractRawCreditIndex(credKey)
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k := extractRawCreditTxRecordKey(credKey)
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v := existsRawTxRecord(ns, k)
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pkScript, err := fetchRawTxRecordPkScript(k, v, index)
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if err != nil {
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return err
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}
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pkScripts = append(pkScripts, pkScript)
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}
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return it.err
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})
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return pkScripts, err
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}
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