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wallet2: extend fake out picks away from the gamma pick
in order to unbias selection from blocks with few txes
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@ -123,6 +123,8 @@ using namespace cryptonote;
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#define FIRST_REFRESH_GRANULARITY 1024
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#define GAMMA_PICK_HALF_WINDOW 5
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static const std::string MULTISIG_SIGNATURE_MAGIC = "SigMultisigPkV1";
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static const std::string MULTISIG_EXTRA_INFO_MAGIC = "MultisigxV1";
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@ -6795,10 +6797,29 @@ void wallet2::get_outs(std::vector<std::vector<tools::wallet2::get_outs_entry>>
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error::get_output_distribution, "Decreasing offsets in rct distribution: " +
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std::to_string(block_offset) + ": " + std::to_string(rct_offsets[block_offset]) + ", " +
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std::to_string(block_offset + 1) + ": " + std::to_string(rct_offsets[block_offset + 1]));
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uint64_t n_rct = rct_offsets[block_offset + 1] - rct_offsets[block_offset];
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uint64_t first_block_offset = block_offset, last_block_offset = block_offset;
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for (size_t half_window = 0; half_window < GAMMA_PICK_HALF_WINDOW; ++half_window)
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{
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// end when we have a non empty block
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uint64_t cum0 = first_block_offset > 0 ? rct_offsets[first_block_offset] - rct_offsets[first_block_offset - 1] : rct_offsets[0];
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if (cum0 > 1)
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break;
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uint64_t cum1 = last_block_offset > 0 ? rct_offsets[last_block_offset] - rct_offsets[last_block_offset - 1] : rct_offsets[0];
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if (cum1 > 1)
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break;
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if (first_block_offset == 0 && last_block_offset >= rct_offsets.size() - 2)
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break;
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// expand up to bounds
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if (first_block_offset > 0)
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--first_block_offset;
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if (last_block_offset < rct_offsets.size() - 1)
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++last_block_offset;
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}
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const uint64_t n_rct = rct_offsets[last_block_offset] - (first_block_offset == 0 ? 0 : rct_offsets[first_block_offset - 1]);
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if (n_rct == 0)
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return rct_offsets[block_offset] ? rct_offsets[block_offset] - 1 : 0;
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return rct_offsets[block_offset] + crypto::rand<uint64_t>() % n_rct;
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MDEBUG("Picking 1/" << n_rct << " in " << (last_block_offset - first_block_offset + 1) << " blocks centered around " << block_offset);
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return rct_offsets[first_block_offset] + crypto::rand<uint64_t>() % n_rct;
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};
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size_t num_selected_transfers = 0;
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