This change modifies the order in which transaction to watched
addresses are processed and when frontend notifications occur. Due to
btcd notifying all transactions before sending the blockconnected
notification, the UTXO and transaction stores can be modified without
sending any frontend notifications, and then a single frontend
notification is sent when the blockconnected notification arrives.
The order in which each file is synced to disk was also changed to
write out the UTXO and transaction stores before writing the wallet.
This is to prevent a race where wallet closes after writing the dirty
wallet, but before the dirty UTXO store is written. In this
situation, newly added UTXOs will be missed and not found again on the
next wallet open during the rescan. Writing the wallet (which holds
the synced-to-block information) last prevents this.
An issue where the unconfirmed change UTXO created from a new
transaction never being properly notified to frontends is fixed now as
well.
This removes the enforced check for the spent field for tx-to-me
notifications, as this is no longer sent, and should be calculated by
wallet (not done yet). Additionally, the full CreatedTx information
is saved with the unmined tx map, so when a tx is mined, information
about which inputs and ouputs it creates that are relevant to the
wallet can be used.
When a wallet is opened, a rescan request will be sent to btcd with
all active addresses from the wallet, to rescan from the last synced
block (now saved to the wallet file) and the current best block.
As multi-account support is further explored, rescan requests should
be batched together to send a single request for all addresses from
all wallets.
This change introduces several changes to the wallet, tx, and utxo
files. Wallet files are still compatible, however, a rescan will try
to start at the genesis block since no correct "last synced to" or
"created at block X" was saved. The tx and utxo files, however, are
not compatible and should be deleted (or an error will occur on read).
If any errors occur opening the utxo file, a rescan will start
beginning at the creation block saved in the wallet.
This change automatically sends the btcdconnected notification for all
frontends as they connect to btcwallet. The old btcdconnected command
has been removed, as it is no longer needed for clients to explicitly
request this information any longer.
This change removes a lot of unnecessary and complicated locking (if
serializing requests is needed in the future, a goroutine will be used
instead) and also shifts the heavy lifting from frontends to btcwallet
itself to handle any notifications when they can be properly handled.
Although it's still legal to, frontends no longer need to explicitly
request account balances as these are calculated and sent as an async
notification on frontend connect, and these notifications will only
occur if btcd is currently connected. Likewise, when btcd connects,
all frontends are immediately notified of all notifications that
require btcd information, such as the current block height for
calculating account balances.
CalculateBalance now works correctly: if confirmations is 0, all UTXOs
will be used for the balance. Otherwise, unconfirmed UTXOs will be
exclused. 1 confirmation will allow the UTXO height and current block
height to be equal. Even though the difference is zero, the
transaction including the UTXO has been mined into one block.
This change also remove extraneous account balance notifications for
connected and disconnected blocks.
Any and all resending should be handled directly by btcd, and btcd
ignores any duplicate transactions when adding to mempool anyways. A
set of unmined txs is still kept and send to btcd in case of btcd
restarting and losing wallet transactions from its mempool.
In case of a btcd restart, it is necessary to send unmined
transactions back to btcd so they can be added to the tx mempool.
btcd can make a best-try effort, but It is ultimately btcwallet's
responsibility that transactions appear in blocks even if btcd is
restarted.
This copies the functionality of btcd for choosing the ports for the
HTTP client (for btcd) and server (for frontends). On testnet, the
following ports are used as default:
- btcd: 18334
- frontends: 18332
When running with the (currently disabled) --mainnet flag, btcwallet
will choose the following ports by default:
- btcd: 8334
- frontends: 8332
Both ports can be overridden no matter the chosen network using the -b
and -p flags.
We need to notify frontends of notifications for every account
(wallet), not just the "current" opened account, since wallet will
need to have multiple wallets open at the same time. Frontends will
have to filter notifications to show only details of only one account
if they need to display just one account at a time.
As of this commit, account balances and lock state notifications are
using this per-account notification scheme.
Use on mainnet is not recommended until extensive testing has been
done, and should be done at your own risk. Run btcwallet with
--mainnet to operate on main Bitcoin network.
This is a big change that also many general fixes to problems found
when creating transactions. In particular the Utxo and Tx formats and
serialization functions were updated with additional information that
would be necessary for rolling back old utxo and tx data data after
btcd chain switches. This change also implements the json methods
'sendfrom' and 'sendmany' to create a new transaction based on a
frontend request.
Transactions are currently not sent to btcd since the tx relay code is
not finished yet, so a temporary error is returned back to frontends
who try to send new transactions.
btcd was changed to send the block hash for new block notifications as
a big endian string, so type assert as a string and convert to a
btcwire.ShaHash.
Each wallet needs its own handler running and listening to replies
from btcd, so that wallet can be synced to disk with the new tx or
utxo information. Another rounter to map from addresses to wallets
could have been written, but we'll use the JSON Id router message
router instead.
