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wallet2: handle corner case in picking fake outputs 

If we originally think we have enough outputs on the blockchain
to pick random fake outputs, we might end up with not enough of
them if enough are actually blackballed.
This commit is contained in:
moneromooo-monero 2018-09-19 20:20:58 +00:00
parent bad2c7cf31
commit 7964d4f8ea
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GPG Key ID: 686F07454D6CEFC3
1 changed files with 27 additions and 3 deletions
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30
src/wallet/wallet2.cpp
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@ -6642,11 +6642,23 @@ void wallet2::get_outs(std::vector<std::vector<tools::wallet2::get_outs_entry>>
}
// while we still need more mixins
uint64_t num_usable_outs = num_outs;
bool allow_blackballed = false;
while (num_found < requested_outputs_count)
{
// if we've gone through every possible output, we've gotten all we can
if (seen_indices.size() == num_outs)
break;
if (seen_indices.size() == num_usable_outs)
{
// there is a first pass which rejects blackballed outputs, then a second pass
// which allows them if we don't have enough non blackballed outputs to reach
// the required amount of outputs (since consensus does not care about blackballed
// outputs, we still need to reach the minimum ring size)
if (allow_blackballed)
break;
MINFO("Not enough non blackballed outputs, we'll allow blackballed ones");
allow_blackballed = true;
num_usable_outs = num_outs;
}
// get a random output index from the DB. If we've already seen it,
// return to the top of the loop and try again, otherwise add it to the
@ -6720,14 +6732,26 @@ void wallet2::get_outs(std::vector<std::vector<tools::wallet2::get_outs_entry>>
if (seen_indices.count(i))
continue;
if (is_output_blackballed(std::make_pair(amount, i))) // don't add blackballed outputs
if (!allow_blackballed && is_output_blackballed(std::make_pair(amount, i))) // don't add blackballed outputs
{
--num_usable_outs;
continue;
}
seen_indices.emplace(i);
LOG_PRINT_L2("picking " << i << " as " << type);
req.outputs.push_back({amount, i});
++num_found;
}
// if we had enough unusable outputs, we might fall off here and still
// have too few outputs, so we stuff with one to keep counts good, and
// we'll error out later
while (num_found < requested_outputs_count)
{
req.outputs.push_back({amount, 0});
++num_found;
}
}
// sort the subsection, to ensure the daemon doesn't know which output is ours