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move the rct commitments to the output_amounts database

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Since these are needed at the same time as the output pubkeys,
this is a whole lot faster, and takes less space. Only outputs
of 0 amount store the commitment. When reading other outputs,
a fake commitment is regenerated on the fly. This avoids having
to rewrite the database to add space for fake commitments for
existing outputs.

This code relies on two things:

- LMDB must support fixed size records per key, rather than
per database (ie, all records on key 0 are the same size, all
records for non 0 keys are same size, but records from key 0
and non 0 keys do have different sizes).

- the commitment must be directly after the rest of the data
in outkey and output_data_t.
This commit is contained in:
moneromooo-monero 2016-06-29 19:55:49 +01:00
parent 6d0e47148b
commit 59a66e209a
No known key found for this signature in database
GPG key ID: 686F07454D6CEFC3
8 changed files with 63 additions and 195 deletions
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25
src/cryptonote_core/blockchain.cpp
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@ -207,21 +207,8 @@ bool Blockchain::scan_outputkeys_for_indexes(size_t tx_version, const txin_to_ke
else
output_index = m_db->get_output_key(tx_in_to_key.amount, i);
rct::key commitment;
if (tx_version > 1)
{
if (tx_in_to_key.amount == 0)
commitment = m_db->get_rct_commitment(i);
else
commitment = rct::zeroCommit(tx_in_to_key.amount);
}
else
{
rct::identity(commitment);
}
// call to the passed boost visitor to grab the public key for the output
if (!vis.handle_output(output_index.unlock_time, output_index.pubkey, commitment))
if (!vis.handle_output(output_index.unlock_time, output_index.pubkey, output_index.commitment))
{
LOG_PRINT_L0("Failed to handle_output for output no = " << count << ", with absolute offset " << i);
return false;
@ -1633,15 +1620,7 @@ void Blockchain::add_out_to_get_rct_random_outs(std::list<COMMAND_RPC_GET_RANDOM
oen.global_amount_index = i;
output_data_t data = m_db->get_output_key(amount, i);
oen.out_key = data.pubkey;
if (amount == 0)
{
oen.commitment = m_db->get_rct_commitment(i);
}
else
{
// not a rct output, make a fake commitment with zero key
oen.commitment = rct::zeroCommit(amount);
}
oen.commitment = data.commitment;
}
//------------------------------------------------------------------
// This function takes an RPC request for mixins and creates an RPC response