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353 lines
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C++

9 years ago
//
// Created by mwo on 5/11/15.
//
#include "MicroCore.h"
namespace
{
// NOTE: These values should match blockchain.cpp
// TODO: Refactor
const uint64_t mainnet_hard_fork_version_1_till = 1009826;
const uint64_t testnet_hard_fork_version_1_till = 624633;
}
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namespace xmreg
{
/**
* The constructor is interesting, as
* m_mempool and m_blockchain_storage depend
* on each other.
*
* So basically m_mempool is initialized with
* reference to Blockchain (i.e., Blockchain&)
* and m_blockchain_storage is initialized with
* reference to m_mempool (i.e., tx_memory_pool&)
*
* The same is done in cryptonode::core.
*/
MicroCore::MicroCore():
m_mempool(m_blockchain_storage),
m_blockchain_storage(m_mempool)
{}
/**
* Initialized the MicroCore object.
*
* Create BlockchainLMDB on the heap.
* Open database files located in blockchain_path.
* Initialize m_blockchain_storage with the BlockchainLMDB object.
*/
bool
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MicroCore::init(const string& _blockchain_path)
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{
int db_flags = 0;
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blockchain_path = _blockchain_path;
//db_flags |= MDB_RDONLY;
db_flags |= MDB_NOLOCK;
//db_flags |= MDB_SYNC;
// uint64_t DEFAULT_FLAGS = MDB_NOMETASYNC | MDB_NORDAHEAD;
//db_flags = DEFAULT_FLAGS;
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HardFork* m_hardfork = nullptr;
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BlockchainDB* db = nullptr;
db = new BlockchainLMDB();
bool use_testnet {false};
uint64_t hard_fork_version_1_till = use_testnet ? testnet_hard_fork_version_1_till : mainnet_hard_fork_version_1_till;
m_hardfork = new HardFork(*db, 1, hard_fork_version_1_till);
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try
{
// try opening lmdb database files
db->open(blockchain_path, db_flags);
}
catch (const std::exception& e)
{
cerr << "Error opening database: " << e.what();
return false;
}
// check if the blockchain database
// is successful opened
if(!db->is_open())
{
return false;
}
// initialize Blockchain object to manage
// the database.
return m_blockchain_storage.init(db, m_hardfork, false);
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}
/**
* Get m_blockchain_storage.
* Initialize m_blockchain_storage with the BlockchainLMDB object.
*/
Blockchain&
MicroCore::get_core()
{
return m_blockchain_storage;
}
/**
* Get block by its height
*
* returns true if success
*/
bool
MicroCore::get_block_by_height(const uint64_t& height, block& blk)
{
crypto::hash block_id;
try
{
block_id = m_blockchain_storage.get_block_id_by_height(height);
}
catch (const exception& e)
{
cerr << e.what() << endl;
return false;
}
if (!m_blockchain_storage.get_block_by_hash(block_id, blk))
{
cerr << "Block with hash " << block_id
<< "and height " << height << " not found!"
<< endl;
return false;
}
return true;
}
/**
* Get transaction tx from the blockchain using it hash
*/
bool
MicroCore::get_tx(const crypto::hash& tx_hash, transaction& tx)
{
try
{
// get transaction with given hash
tx = m_blockchain_storage.get_db().get_tx(tx_hash);
}
catch (const exception& e)
{
cerr << e.what() << endl;
return false;
}
return true;
}
bool
MicroCore::get_tx(const string& tx_hash_str, transaction& tx)
{
// parse tx hash string to hash object
crypto::hash tx_hash;
if (!xmreg::parse_str_secret_key(tx_hash_str, tx_hash))
{
cerr << "Cant parse tx hash: " << tx_hash_str << endl;
return false;
}
if (!get_tx(tx_hash, tx))
{
return false;
}
return true;
}
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/**
* Find output with given public key in a given transaction
*/
bool
MicroCore::find_output_in_tx(const transaction& tx,
const public_key& output_pubkey,
tx_out& out,
size_t& output_index)
{
size_t idx {0};
// search in the ouputs for an output which
// public key matches to what we want
auto it = std::find_if(tx.vout.begin(), tx.vout.end(),
[&](const tx_out& o)
{
const txout_to_key& tx_in_to_key
= boost::get<txout_to_key>(o.target);
++idx;
return tx_in_to_key.key == output_pubkey;
});
if (it != tx.vout.end())
{
// we found the desired public key
out = *it;
output_index = idx > 0 ? idx - 1 : idx;
//cout << idx << " " << output_index << endl;
return true;
}
return false;
}
/**
* Returns tx hash in a given block which
* contains given output's public key
*/
bool
MicroCore::get_tx_hash_from_output_pubkey(const public_key& output_pubkey,
const uint64_t& block_height,
crypto::hash& tx_hash,
cryptonote::transaction& tx_found)
{
tx_hash = null_hash;
// get block of given height
block blk;
if (!get_block_by_height(block_height, blk))
{
cerr << "Cant get block of height: " << block_height << endl;
return false;
}
// get all transactions in the block found
// initialize the first list with transaction for solving
// the block i.e. coinbase.
list<transaction> txs {blk.miner_tx};
list<crypto::hash> missed_txs;
if (!m_blockchain_storage.get_transactions(blk.tx_hashes, txs, missed_txs))
{
cerr << "Cant find transcations in block: " << block_height << endl;
return false;
}
if (!missed_txs.empty())
{
cerr << "Transactions not found in blk: " << block_height << endl;
for (const crypto::hash& h : missed_txs)
{
cerr << " - tx hash: " << h << endl;
}
return false;
}
// search outputs in each transactions
// until output with pubkey of interest is found
for (const transaction& tx : txs)
{
tx_out found_out;
// we dont need here output_index
size_t output_index;
if (find_output_in_tx(tx, output_pubkey, found_out, output_index))
{
// we found the desired public key
tx_hash = get_transaction_hash(tx);
tx_found = tx;
return true;
}
}
return false;
}
uint64_t
MicroCore::get_blk_timestamp(uint64_t blk_height)
{
cryptonote::block blk;
if (!get_block_by_height(blk_height, blk))
{
cerr << "Cant get block by height: " << blk_height << endl;
return 0;
}
return blk.timestamp;
}
/**
* De-initialized Blockchain.
*
* since blockchain is opened as MDB_RDONLY
* need to manually free memory taken on heap
* by BlockchainLMDB
*/
MicroCore::~MicroCore()
{
delete &m_blockchain_storage.get_db();
}
bool
init_blockchain(const string& path,
MicroCore& mcore,
Blockchain*& core_storage)
{
// initialize the core using the blockchain path
if (!mcore.init(path))
{
cerr << "Error accessing blockchain." << endl;
return false;
}
// get the high level Blockchain object to interact
// with the blockchain lmdb database
core_storage = &(mcore.get_core());
return true;
}
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string
MicroCore::get_blkchain_path()
{
return blockchain_path;
}
}