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Use fee/priority estimates in wallet CreateTransaction

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The wallet now uses the mempool fee estimator with a new
command-line option: -txconfirmtarget (default: 1) instead
of using hard-coded fees or priorities.

A new bitcoind that hasn't seen enough transactions to estimate
will fall back to the old hard-coded minimum priority or
transaction fee.

-paytxfee option overrides -txconfirmtarget.

Relaying and mining code isn't changed.

For Qt, the coin control dialog now uses priority estimates to
label transaction priority (instead of hard-coded constants);
unspent outputs were consistently labeled with a much higher
priority than is justified by the free transactions actually
being accepted into blocks.

I did not implement any GUI for setting -txconfirmtarget; I would
suggest getting rid of the "Pay transaction fee" GUI and replace
it with either "target number of confirmations" or maybe
a "faster confirmation <--> lower fee" slider or select box.
This commit is contained in:
Gavin Andresen
2014-05-27 15:44:57 -04:00
parent 29264a0a60
commit b33d1f5ee5
9 changed files with 105 additions and 47 deletions
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7
src/init.cpp
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@@ -254,6 +254,7 @@ std::string HelpMessage(HelpMessageMode mode)
strUsage += "\n" + _("Wallet options:") + "\n";
strUsage += " -disablewallet " + _("Do not load the wallet and disable wallet RPC calls") + "\n";
strUsage += " -paytxfee=<amt> " + strprintf(_("Fee (in BTC/kB) to add to transactions you send (default: %s)"), FormatMoney(payTxFee.GetFeePerK())) + "\n";
strUsage += " -txconfirmtarget=<n> " + _("If paytxfee is not set, include enough fee so transactions are confirmed on average within n blocks (default: 1)") + "\n";
strUsage += " -rescan " + _("Rescan the block chain for missing wallet transactions") + " " + _("on startup") + "\n";
strUsage += " -salvagewallet " + _("Attempt to recover private keys from a corrupt wallet.dat") + " " + _("on startup") + "\n";
strUsage += " -spendzeroconfchange " + _("Spend unconfirmed change when sending transactions (default: 1)") + "\n";
@@ -635,7 +636,13 @@ bool AppInit2(boost::thread_group& threadGroup)
if (nFeePerK > nHighTransactionFeeWarning)
InitWarning(_("Warning: -paytxfee is set very high! This is the transaction fee you will pay if you send a transaction."));
payTxFee = CFeeRate(nFeePerK, 1000);
if (payTxFee < CTransaction::minRelayTxFee)
{
return InitError(strprintf(_("Invalid amount for -paytxfee=<amount>: '%s' (must be at least %s)"),
mapArgs["-paytxfee"], CTransaction::minRelayTxFee.ToString()));
}
}
nTxConfirmTarget = GetArg("-txconfirmtarget", 1);
bSpendZeroConfChange = GetArg("-spendzeroconfchange", true);
std::string strWalletFile = GetArg("-wallet", "wallet.dat");