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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2021 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#ifndef BITCOIN_KERNEL_CHAINPARAMS_H
#define BITCOIN_KERNEL_CHAINPARAMS_H
#include <consensus/params.h>
#include <kernel/messagestartchars.h>
#include <primitives/block.h>
#include <uint256.h>
#include <util/chaintype.h>
#include <util/hash_type.h>
#include <util/vector.h>
#include <cstdint>
#include <iterator>
#include <map>
#include <memory>
#include <optional>
#include <string>
#include <unordered_map>
#include <utility>
#include <vector>
typedef std::map<int, uint256> MapCheckpoints;
struct CCheckpointData {
MapCheckpoints mapCheckpoints;
int GetHeight() const {
const auto& final_checkpoint = mapCheckpoints.rbegin();
return final_checkpoint->first /* height */;
}
};
struct AssumeutxoHash : public BaseHash<uint256> {
explicit AssumeutxoHash(const uint256& hash) : BaseHash(hash) {}
};
/**
* Holds configuration for use during UTXO snapshot load and validation. The contents
* here are security critical, since they dictate which UTXO snapshots are recognized
* as valid.
*/
struct AssumeutxoData {
int height;
//! The expected hash of the deserialized UTXO set.
AssumeutxoHash hash_serialized;
//! Used to populate the nChainTx value, which is used during BlockManager::LoadBlockIndex().
//!
//! We need to hardcode the value here because this is computed cumulatively using block data,
//! which we do not necessarily have at the time of snapshot load.
unsigned int nChainTx;
//! The hash of the base block for this snapshot. Used to refer to assumeutxo data
//! prior to having a loaded blockindex.
uint256 blockhash;
};
/**
* Holds various statistics on transactions within a chain. Used to estimate
* verification progress during chain sync.
*
* See also: CChainParams::TxData, GuessVerificationProgress.
*/
struct ChainTxData {
int64_t nTime; //!< UNIX timestamp of last known number of transactions
int64_t nTxCount; //!< total number of transactions between genesis and that timestamp
double dTxRate; //!< estimated number of transactions per second after that timestamp
};
/**
* CChainParams defines various tweakable parameters of a given instance of the
* Bitcoin system.
*/
class CChainParams
{
public:
enum Base58Type {
PUBKEY_ADDRESS,
SCRIPT_ADDRESS,
SECRET_KEY,
EXT_PUBLIC_KEY,
EXT_SECRET_KEY,
MAX_BASE58_TYPES
};
const Consensus::Params& GetConsensus() const { return consensus; }
const MessageStartChars& MessageStart() const { return pchMessageStart; }
uint16_t GetDefaultPort() const { return nDefaultPort; }
const CBlock& GenesisBlock() const { return genesis; }
/** Default value for -checkmempool and -checkblockindex argument */
bool DefaultConsistencyChecks() const { return fDefaultConsistencyChecks; }
/** If this chain is exclusively used for testing */
bool IsTestChain() const { return m_chain_type != ChainType::MAIN; }
/** If this chain allows time to be mocked */
bool IsMockableChain() const { return m_is_mockable_chain; }
uint64_t PruneAfterHeight() const { return nPruneAfterHeight; }
/** Minimum free space (in GB) needed for data directory */
uint64_t AssumedBlockchainSize() const { return m_assumed_blockchain_size; }
/** Minimum free space (in GB) needed for data directory when pruned; Does not include prune target*/
uint64_t AssumedChainStateSize() const { return m_assumed_chain_state_size; }
/** Whether it is possible to mine blocks on demand (no retargeting) */
bool MineBlocksOnDemand() const { return consensus.fPowNoRetargeting; }
/** Return the chain type string */
std::string GetChainTypeString() const { return ChainTypeToString(m_chain_type); }
/** Return the chain type */
ChainType GetChainType() const { return m_chain_type; }
/** Return the list of hostnames to look up for DNS seeds */
const std::vector<std::string>& DNSSeeds() const { return vSeeds; }
const std::vector<unsigned char>& Base58Prefix(Base58Type type) const { return base58Prefixes[type]; }
const std::string& Bech32HRP() const { return bech32_hrp; }
const std::vector<uint8_t>& FixedSeeds() const { return vFixedSeeds; }
const CCheckpointData& Checkpoints() const { return checkpointData; }
std::optional<AssumeutxoData> AssumeutxoForHeight(int height) const
{
return FindFirst(m_assumeutxo_data, [&](const auto& d) { return d.height == height; });
}
std::optional<AssumeutxoData> AssumeutxoForBlockhash(const uint256& blockhash) const
{
return FindFirst(m_assumeutxo_data, [&](const auto& d) { return d.blockhash == blockhash; });
}
const ChainTxData& TxData() const { return chainTxData; }
/**
* SigNetOptions holds configurations for creating a signet CChainParams.
*/
struct SigNetOptions {
std::optional<std::vector<uint8_t>> challenge{};
std::optional<std::vector<std::string>> seeds{};
};
/**
* VersionBitsParameters holds activation parameters
*/
struct VersionBitsParameters {
int64_t start_time;
int64_t timeout;
int min_activation_height;
};
/**
* RegTestOptions holds configurations for creating a regtest CChainParams.
*/
struct RegTestOptions {
std::unordered_map<Consensus::DeploymentPos, VersionBitsParameters> version_bits_parameters{};
std::unordered_map<Consensus::BuriedDeployment, int> activation_heights{};
bool fastprune{false};
};
static std::unique_ptr<const CChainParams> RegTest(const RegTestOptions& options);
static std::unique_ptr<const CChainParams> SigNet(const SigNetOptions& options);
static std::unique_ptr<const CChainParams> Main();
static std::unique_ptr<const CChainParams> TestNet();
protected:
CChainParams() {}
Consensus::Params consensus;
MessageStartChars pchMessageStart;
uint16_t nDefaultPort;
uint64_t nPruneAfterHeight;
uint64_t m_assumed_blockchain_size;
uint64_t m_assumed_chain_state_size;
std::vector<std::string> vSeeds;
std::vector<unsigned char> base58Prefixes[MAX_BASE58_TYPES];
std::string bech32_hrp;
ChainType m_chain_type;
CBlock genesis;
std::vector<uint8_t> vFixedSeeds;
bool fDefaultConsistencyChecks;
bool m_is_mockable_chain;
CCheckpointData checkpointData;
std::vector<AssumeutxoData> m_assumeutxo_data;
ChainTxData chainTxData;
};
#endif // BITCOIN_KERNEL_CHAINPARAMS_H
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