1 files changed, 187 insertions, 0 deletions
diff --git a/src/kernel/chainparams.h b/src/kernel/chainparams.h
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+++ b/src/kernel/chainparams.h
@@ -0,0 +1,187 @@
+// 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 <netaddress.h>
+#include <primitives/block.h>
+#include <protocol.h>
+#include <uint256.h>
+#include <util/hash_type.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 {
+    //! The expected hash of the deserialized UTXO set.
+    const 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.
+    const unsigned int nChainTx;
+};
+
+using MapAssumeutxo = std::map<int, const AssumeutxoData>;
+
+/**
+ * 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 CMessageHeader::MessageStartChars& MessageStart() const { return pchMessageStart; }
+    uint16_t GetDefaultPort() const { return nDefaultPort; }
+    uint16_t GetDefaultPort(Network net) const
+    {
+        return net == NET_I2P ? I2P_SAM31_PORT : GetDefaultPort();
+    }
+    uint16_t GetDefaultPort(const std::string& addr) const
+    {
+        CNetAddr a;
+        return a.SetSpecial(addr) ? GetDefaultPort(a.GetNetwork()) : GetDefaultPort();
+    }
+
+    const CBlock& GenesisBlock() const { return genesis; }
+    /** Default value for -checkmempool and -checkblockindex argument */
+    bool DefaultConsistencyChecks() const { return fDefaultConsistencyChecks; }
+    /** Policy: Filter transactions that do not match well-defined patterns */
+    bool RequireStandard() const { return fRequireStandard; }
+    /** If this chain is exclusively used for testing */
+    bool IsTestChain() const { return m_is_test_chain; }
+    /** 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 network string */
+    std::string NetworkIDString() const { return strNetworkID; }
+    /** 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; }
+
+    //! Get allowed assumeutxo configuration.
+    //! @see ChainstateManager
+    const MapAssumeutxo& Assumeutxo() const { return m_assumeutxo_data; }
+
+    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;
+    CMessageHeader::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;
+    std::string strNetworkID;
+    CBlock genesis;
+    std::vector<uint8_t> vFixedSeeds;
+    bool fDefaultConsistencyChecks;
+    bool fRequireStandard;
+    bool m_is_test_chain;
+    bool m_is_mockable_chain;
+    CCheckpointData checkpointData;
+    MapAssumeutxo m_assumeutxo_data;
+    ChainTxData chainTxData;
+};
+
+#endif // BITCOIN_KERNEL_CHAINPARAMS_H