225 lines
7.2 KiB
Go
225 lines
7.2 KiB
Go
/*
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* Copyright (c) 2013-2015 The btcsuite developers
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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package wallet
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import (
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"github.com/btcsuite/btcd/txscript"
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"github.com/btcsuite/btcwallet/chain"
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"github.com/btcsuite/btcwallet/waddrmgr"
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"github.com/btcsuite/btcwallet/wtxmgr"
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)
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func (w *Wallet) handleChainNotifications() {
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sync := func(w *Wallet) {
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// At the moment there is no recourse if the rescan fails for
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// some reason, however, the wallet will not be marked synced
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// and many methods will error early since the wallet is known
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// to be out of date.
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err := w.syncWithChain()
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if err != nil && !w.ShuttingDown() {
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log.Warnf("Unable to synchronize wallet to chain: %v", err)
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}
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}
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for n := range w.chainSvr.Notifications() {
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var err error
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switch n := n.(type) {
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case chain.ClientConnected:
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go sync(w)
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case chain.BlockConnected:
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w.connectBlock(waddrmgr.BlockStamp(n))
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case chain.BlockDisconnected:
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err = w.disconnectBlock(waddrmgr.BlockStamp(n))
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case chain.RelevantTx:
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err = w.addRelevantTx(n.TxRecord, n.Block)
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// The following are handled by the wallet's rescan
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// goroutines, so just pass them there.
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case *chain.RescanProgress, *chain.RescanFinished:
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w.rescanNotifications <- n
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}
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if err != nil {
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log.Errorf("Cannot handle chain server "+
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"notification: %v", err)
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}
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}
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w.wg.Done()
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}
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// connectBlock handles a chain server notification by marking a wallet
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// that's currently in-sync with the chain server as being synced up to
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// the passed block.
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func (w *Wallet) connectBlock(bs waddrmgr.BlockStamp) {
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if !w.ChainSynced() {
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return
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}
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if err := w.Manager.SetSyncedTo(&bs); err != nil {
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log.Errorf("Failed to update address manager sync state in "+
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"connect block for hash %v (height %d): %v", bs.Hash,
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bs.Height, err)
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}
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w.notifyConnectedBlock(bs)
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w.notifyBalances(bs.Height)
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}
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// disconnectBlock handles a chain server reorganize by rolling back all
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// block history from the reorged block for a wallet in-sync with the chain
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// server.
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func (w *Wallet) disconnectBlock(bs waddrmgr.BlockStamp) error {
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if !w.ChainSynced() {
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return nil
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}
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// Disconnect the last seen block from the manager if it matches the
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// removed block.
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iter := w.Manager.NewIterateRecentBlocks()
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if iter != nil && iter.BlockStamp().Hash == bs.Hash {
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if iter.Prev() {
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prev := iter.BlockStamp()
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w.Manager.SetSyncedTo(&prev)
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err := w.TxStore.Rollback(prev.Height + 1)
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if err != nil {
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return err
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}
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} else {
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// The reorg is farther back than the recently-seen list
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// of blocks has recorded, so set it to unsynced which
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// will in turn lead to a rescan from either the
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// earliest blockstamp the addresses in the manager are
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// known to have been created.
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w.Manager.SetSyncedTo(nil)
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}
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}
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w.notifyDisconnectedBlock(bs)
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w.notifyBalances(bs.Height - 1)
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return nil
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}
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func (w *Wallet) addRelevantTx(rec *wtxmgr.TxRecord, block *wtxmgr.BlockMeta) error {
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// TODO: The transaction store and address manager need to be updated
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// together, but each operate under different namespaces and are changed
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// under new transactions. This is not error safe as we lose
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// transaction semantics.
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//
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// I'm unsure of the best way to solve this. Some possible solutions
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// and drawbacks:
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//
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// 1. Open write transactions here and pass the handle to every
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// waddrmr and wtxmgr method. This complicates the caller code
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// everywhere, however.
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//
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// 2. Move the wtxmgr namespace into the waddrmgr namespace, likely
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// under its own bucket. This entire function can then be moved
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// into the waddrmgr package, which updates the nested wtxmgr.
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// This removes some of separation between the components.
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//
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// 3. Use multiple wtxmgrs, one for each account, nested in the
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// waddrmgr namespace. This still provides some sort of logical
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// separation (transaction handling remains in another package, and
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// is simply used by waddrmgr), but may result in duplicate
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// transactions being saved if they are relevant to multiple
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// accounts.
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//
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// 4. Store wtxmgr-related details under the waddrmgr namespace, but
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// solve the drawback of #3 by splitting wtxmgr to save entire
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// transaction records globally for all accounts, with
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// credit/debit/balance tracking per account. Each account would
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// also save the relevant transaction hashes and block incidence so
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// the full transaction can be loaded from the waddrmgr
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// transactions bucket. This currently seems like the best
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// solution.
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// At the moment all notified transactions are assumed to actually be
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// relevant. This assumption will not hold true when SPV support is
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// added, but until then, simply insert the transaction because there
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// should either be one or more relevant inputs or outputs.
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err := w.TxStore.InsertTx(rec, block)
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if err != nil {
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return err
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}
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// Check every output to determine whether it is controlled by a wallet
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// key. If so, mark the output as a credit.
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for i, output := range rec.MsgTx.TxOut {
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_, addrs, _, err := txscript.ExtractPkScriptAddrs(output.PkScript,
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w.chainParams)
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if err != nil {
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// Non-standard outputs are skipped.
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continue
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}
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for _, addr := range addrs {
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ma, err := w.Manager.Address(addr)
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if err == nil {
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// TODO: Credits should be added with the
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// account they belong to, so wtxmgr is able to
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// track per-account balances.
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err = w.TxStore.AddCredit(rec, block, uint32(i),
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ma.Internal())
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if err != nil {
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return err
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}
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err = w.Manager.MarkUsed(addr)
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if err != nil {
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return err
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}
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log.Debugf("Marked address %v used", addr)
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continue
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}
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// Missing addresses are skipped. Other errors should
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// be propagated.
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code := err.(waddrmgr.ManagerError).ErrorCode
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if code != waddrmgr.ErrAddressNotFound {
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return err
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}
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}
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}
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// TODO: Notify connected clients of the added transaction.
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bs, err := w.chainSvr.BlockStamp()
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if err == nil {
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w.notifyBalances(bs.Height)
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}
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return nil
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}
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func (w *Wallet) notifyBalances(curHeight int32) {
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// Don't notify unless wallet is synced to the chain server.
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if !w.ChainSynced() {
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return
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}
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// Notify any potential changes to the balance.
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confirmed, err := w.TxStore.Balance(1, curHeight)
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if err != nil {
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log.Errorf("Cannot determine 1-conf balance: %v", err)
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return
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}
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w.notifyConfirmedBalance(confirmed)
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unconfirmed, err := w.TxStore.Balance(0, curHeight)
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if err != nil {
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log.Errorf("Cannot determine 0-conf balance: %v", err)
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return
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}
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w.notifyUnconfirmedBalance(unconfirmed - confirmed)
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}
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