This package is used solely for the storage of private and public
keys, and the addresses they represent. Since "wallet" is an
overloaded term and a working wallet requires transaction history as
well, rename this package and its data structures to more clearly
reflect what it is for.
When a BIP0032 wallet is implemented and multiple address chains can
be supported by a single keystore, the Account structure will
represent a single wallet (and be renamed to reflect that change),
rather than keeping the collection of Account structs as currently
managed by the AccountManager. In preperation for this, and to remove
a global variable, move the fee increment for created transactions to
this structure. When setting the fee, look it up from the default
account.
Pass the RPC client to the notification handlers. Update the last
seen block for blockconnected notifications in the client structure
directly, protecting access with a mutex.
When the addmultisigaddress RPC was called, the wallet with the
imported address was not being written to disk, and if no more writes
were scheduled, the address could be lost. This change immediately
writes the updated keystore to disk before the RPC returns.
Closes#98.
This change fixes the asynchronous deferred locking that used to be
performed after some timeout after a call to walletpassphrase by
managing the locked state of each account in a new account manager
goroutine. The timeouts for new unlock requests replace any running
timeouts for older requests, rather than allowing previous timeouts to
expire before the most recent one.
Fixes#105.
This commit is the result of inspecting the results of both cpu and
memory profiling, to improve areas where wallet can be more efficient
on transaction inserts.
One problem that's very evident by profiling is how much waiting there
is for file (txstore, wallet) writes. This commit does not attempt to
fix this yet, but focuses on the easier-to-fix memory allocation
issues which can slow down the rest of wallet due to excessive garbage
collection scanning.
While here, fix a race where a closure run as a goroutine was closing
over a range iterator.
The Credit and Debits structures are simple wrappers around an
embedded *txstore.TxRecord, as well as an output index in the case of
Credit. This means that a Credit is at most two words, while a Debits
struct is just one. To avoid the unnecessary garbage of creating
Credit and Debits structures on the heap (where the underlying
TxRecord likely already is), simply pass around everywhere as
non-pointer types, and modify the receivers for all Credit and Debits
methods to non-pointer receivers since none of them ever modify the
value.
This was only necessary for a very old version of the transaction
store. The current implementation stores both sent (debit) and
received (credit) records for individual transactions.
This change rewrites much of the error handling for the RPC server
components to match a more idiomatic Go error handling style as well as
fix several issues regarding error equality checks.
Closes#94.
The gettransaction handler was attempting to lookup the "sent-to"
address of an outgoing transaction from the transaction store (as a
wallet credit). This is the incorrect address when sending to an
address controlled by another wallet, and panics when there are no
credits (for example, sending to another wallet without any change
address). Instead, use the first non-change output address is used as
the address of the "send" result.
This fixes the panic reported when debugging issue #91.
While here, fix the category strings used for wallet credits to
support immature and generate (the categories for coinbase outputs).
If an unexpected error is encounted when creating the encrypted
wallet, rather than using btcjson.ErrInternal, wrap the error message
using btcjson.ErrWallet.Code.
This change is the result of using the errcheck tool
(https://github.com/kisielk/errcheck) to find all unchecked errors,
both unassigned and those assigned to the blank identifier.
Every returned error is now handled in some manner. These include:
- Logging errors that would otherwise be missed
- Returning errors to the caller for further processing
- Checking error values to determine what to do next
- Panicking for truely exceptional "impossible" errors
On the subject of panics, they are a sharp tool and should be used
sparingly. That being said, I have added them to check errors that
were previously explicitly ignored, because they were expected to
always return without failure. This could be due to fake error paths
(i.e. writing to a bytes.Buffer panics for OOM and should never return
an error) or previous logic asserts that an error case is impossible.
Rather than leaving these unhandled and letting code fail later,
either with incorrect results or a nil pointer dereference, it now
produces a stack trace at the error emit site, which I find far more
useful when debugging.
While here, a bunch of dead code was removed, including code to move
pre-0.1.1 uxto and transaction history account files to the new
directory (as they would be unreadable anyways) and a big chunk of
commented out rpcclient code.
So (SigHashAll & SigHashSingle)!= 0, which is not the intention here. fix up
that check to only match SigHashSingle.
Found by drahn, debugged together, fix by me.
This is an intial pass at converting the btcwallet and deps codebases
to pass a network by their parameters, rather than by a magic number
to identify the network. The parameters in params.go have been
updated to embed a *btcnet.Params, and all previous uses of cfg.Net()
have been replaced with activeNet.{Params,Net} (where activeNet is
the global var for the active network).
Although dependancy packages have not yet been updated from using
btcwire.BitcoinNet to btcnet.Params, the parameters are now accessible
at all callsites, and individual packages can be updated to use btcnet
without requiring updates in each external btc* package at once.
While here, the exported API for btcwallet internal library packages
(txstore and wallet) have been updated to pass full network parameters
rather than the btcwire definition of a network.
The category for a received coinbase output should be "generate" for a
mature coinbase (one that has reached btcchain.CoinbaseMaturity
confirmations), or "immature" if the required number of confirmations
has not been reached yet. New Confirmed and Confirmations methods
have been added to the transaction store's TxRecord type to check if
the required number of confirmations have been met for coinbase
outputs.
While here, update the main package to use the new TxRecord methods,
rather than duplicating the confirmation checking code in two places.
The last transaction store was a great example of how not to write
scalable software. For a variety of reasons, it was very slow at
processing transaction inserts. Among them:
1) Every single transaction record being saved in a linked list
(container/list), and inserting into this list would be an O(n)
operation so that records could be ordered by receive date.
2) Every single transaction in the above mentioned list was iterated
over in order to find double spends which must be removed. It is
silly to do this check for mined transactions, which already have
been checked for this by btcd. Worse yet, if double spends were
found, the list would be iterated a second (or third, or fourth)
time for each removed transaction.
3) All spend tracking for signed-by-wallet transactions was found on
each transaction insert, even if the now spent previous transaction
outputs were known by the caller.
This list could keep going on, but you get the idea. It was bad.
To resolve these issues a new transaction store had to be implemented.
The new implementation:
1) Tracks mined and unmined transactions in different data structures.
Mined transactions are cheap to track because the required double
spend checks have already been performed by the chain server, and
double spend checks are only required to be performed on
newly-inserted mined transactions which may conflict with previous
unmined transactions.
2) Saves mined transactions grouped by block first, and then by their
transaction index. Lookup keys for mined transactions are simply
the block height (in the best chain, that's all we save) and index
of the transaction in the block. This makes looking up any
arbitrary transaction almost an O(1) operation (almost, because
block height and block indexes are mapped to their slice indexes
with a Go map).
3) Saves records in each transaction for whether the outputs are
wallet credits (spendable by wallet) and for whether inputs debit
from previous credits. Both structures point back to the source
or spender (credits point to the transaction that spends them, or
nil for unspent credits, and debits include keys to lookup the
transaction credits they spent. While complicated to keep track
of, this greatly simplifies the spent tracking for transactions
across rollbacks and transaction removals.
4) Implements double spend checking as an almost O(1) operation. A
Go map is used to map each previous outpoint for all unconfirmed
transactions to the unconfirmed tx record itself. Checking for
double spends on confirmed transaction inserts only involves
looking up each previous outpoint of the inserted tx in this map.
If a double spend is found, removal is simplified by only
removing the transaction and its spend chain from store maps,
rather than iterating a linked list several times over to remove
each dead transaction in the spend chain.
5) Allows the caller to specify the previous credits which are spent
by a debiting transaction. When a transaction is created by
wallet, the previous outputs are already known, and by passing
their record types to the AddDebits method, lookups for each
previously unspent credit are omitted.
6) Bookkeeps all blocks with transactions with unspent credits, and
bookkeeps the transaction indexes of all transactions with unspent
outputs for a single block. For the case where the caller adding a
debit record does not know what credits a transaction debits from,
these bookkeeping structures allow the store to only consider known
unspent transactions, rather than searching through both spent and
unspents.
7) Saves amount deltas for the entire balance as a result of each
block, due to transactions within that block. This improves the
performance of calculating the full balance by not needing to
iterate over every transaction, and then every credit, to determine
if a credit is spent or unspent. When transactions are moved from
unconfirmed to a block structure, the amount deltas are incremented
by the amount of all transaction credits (both spent and unspent)
and debited by the total amount the transaction spends from
previous wallet credits. For the common case of calculating a
balance with just one confirmation, the only involves iterating
over each block structure and adding the (possibly negative)
amount delta. Coinbase rewards are saved similarly, but with a
different amount variable so they can be seperatly included or
excluded.
Due to all of the changes in how the store internally works, the
serialization format has changed. To simplify the serialization
logic, support for reading the last store file version has been
removed. Past this change, a rescan (run automatically) will be
required to rebuild the transaction history.
This commit modifies all code paths which work with transaction result
objects to use the concrete ListTransactionsResult provided by the btcjson
package. This provides nicer marshalling and unmarshalling as well as
access to properly typed fields.
