args.h

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// Copyright (c) 2023-present 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_COMMON_ARGS_H
#define BITCOIN_COMMON_ARGS_H

#include <common/settings.h>
#include <compat/compat.h>
#include <sync.h>
#include <util/chaintype.h>
#include <util/fs.h>

#include <concepts>
#include <cstdint>
#include <iosfwd>
#include <list>
#include <map>
#include <optional>
#include <set>
#include <string>
#include <variant>
#include <vector>

class ArgsManager;

extern const char * const BITCOIN_CONF_FILENAME;
extern const char * const BITCOIN_SETTINGS_FILENAME;

// Return true if -datadir option points to a valid directory or is not specified.
bool CheckDataDirOption(const ArgsManager& args);

fs::path AbsPathForConfigVal(const ArgsManager& args, const fs::path& path, bool net_specific = true);

inline bool IsSwitchChar(char c)
{
#ifdef WIN32
    return c == '-' || c == '/';
#else
    return c == '-';
#endif
}

enum class OptionsCategory {
    OPTIONS,
    CONNECTION,
    WALLET,
    WALLET_DEBUG_TEST,
    ZMQ,
    DEBUG_TEST,
    CHAINPARAMS,
    NODE_RELAY,
    BLOCK_CREATION,
    RPC,
    GUI,
    COMMANDS,
    REGISTER_COMMANDS,
    CLI_COMMANDS,
    IPC,

    HIDDEN // Always the last option to avoid printing these in the help
};

struct KeyInfo {
    std::string name;
    std::string section;
    bool negated{false};
};

KeyInfo InterpretKey(std::string key);

std::optional<common::SettingsValue> InterpretValue(const KeyInfo& key, const std::string* value,
                                                         unsigned int flags, std::string& error);

struct SectionInfo {
    std::string m_name;
    std::string m_file;
    int m_line;
};

std::string SettingToString(const common::SettingsValue&, const std::string&);
std::optional<std::string> SettingToString(const common::SettingsValue&);

template <std::integral Int>
Int SettingTo(const common::SettingsValue&, Int);

template <std::integral Int>
std::optional<Int> SettingTo(const common::SettingsValue&);

bool SettingToBool(const common::SettingsValue&, bool);
std::optional<bool> SettingToBool(const common::SettingsValue&);

class ArgsManager
{
public:
    enum Flags : uint32_t {
        ALLOW_ANY = 0x01,         
        // ALLOW_BOOL = 0x02,     //!< unimplemented, draft implementation in #16545
        // ALLOW_INT = 0x04,      //!< unimplemented, draft implementation in #16545
        // ALLOW_STRING = 0x08,   //!< unimplemented, draft implementation in #16545
        // ALLOW_LIST = 0x10,     //!< unimplemented, draft implementation in #16545
        DISALLOW_NEGATION = 0x20, 
        DISALLOW_ELISION = 0x40,  

        DEBUG_ONLY = 0x100,
        /* Some options would cause cross-contamination if values for
         * mainnet were used while running on regtest/testnet (or vice-versa).
         * Setting them as NETWORK_ONLY ensures that sharing a config file
         * between mainnet and regtest/testnet won't cause problems due to these
         * parameters by accident. */
        NETWORK_ONLY = 0x200,
        // This argument's value is sensitive (such as a password).
        SENSITIVE = 0x400,
        COMMAND = 0x800,
    };

protected:
    struct Arg
    {
        std::string m_help_param;
        std::string m_help_text;
        unsigned int m_flags;
    };

    mutable RecursiveMutex cs_args;
    common::Settings m_settings GUARDED_BY(cs_args);
    std::vector<std::string> m_command GUARDED_BY(cs_args);
    std::string m_network GUARDED_BY(cs_args);
    std::set<std::string> m_network_only_args GUARDED_BY(cs_args);
    std::map<OptionsCategory, std::map<std::string, Arg>> m_available_args GUARDED_BY(cs_args);
    std::optional<unsigned int> m_default_flags GUARDED_BY(cs_args){};
    bool m_accept_any_command GUARDED_BY(cs_args){true};
    std::list<SectionInfo> m_config_sections GUARDED_BY(cs_args);
    std::optional<fs::path> m_config_path GUARDED_BY(cs_args);
    mutable fs::path m_cached_blocks_path GUARDED_BY(cs_args);
    mutable fs::path m_cached_datadir_path GUARDED_BY(cs_args);
    mutable fs::path m_cached_network_datadir_path GUARDED_BY(cs_args);

    [[nodiscard]] bool ReadConfigStream(std::istream& stream, const std::string& filepath, std::string& error, bool ignore_invalid_keys = false);

    bool UseDefaultSection(const std::string& arg) const EXCLUSIVE_LOCKS_REQUIRED(cs_args);

 public:
    common::SettingsValue GetSetting(const std::string& arg) const;

    std::vector<common::SettingsValue> GetSettingsList(const std::string& arg) const;

    ArgsManager();
    ~ArgsManager();

    void SelectConfigNetwork(const std::string& network);

    [[nodiscard]] bool ParseParameters(int argc, const char* const argv[], std::string& error);

    fs::path GetConfigFilePath() const;
    void SetConfigFilePath(fs::path);
    [[nodiscard]] bool ReadConfigFiles(std::string& error, bool ignore_invalid_keys = false);

    std::set<std::string> GetUnsuitableSectionOnlyArgs() const;

    std::list<SectionInfo> GetUnrecognizedSections() const;

    struct Command {
        std::string command;
        std::vector<std::string> args;
    };
    std::optional<const Command> GetCommand() const;

    fs::path GetBlocksDirPath() const;

    fs::path GetDataDirBase() const { return GetDataDir(false); }

    fs::path GetDataDirNet() const { return GetDataDir(true); }

    void ClearPathCache();

    std::vector<std::string> GetArgs(const std::string& strArg) const;

    bool IsArgSet(const std::string& strArg) const;

    bool IsArgNegated(const std::string& strArg) const;

    std::string GetArg(const std::string& strArg, const std::string& strDefault) const;
    std::optional<std::string> GetArg(const std::string& strArg) const;

    fs::path GetPathArg(std::string arg, const fs::path& default_value = {}) const;

    template <std::integral Int>
    Int GetArg(const std::string& strArg, Int nDefault) const;

    template <std::integral Int>
    std::optional<Int> GetArg(const std::string& strArg) const;

    int64_t GetIntArg(const std::string& strArg, int64_t nDefault) const { return GetArg<int64_t>(strArg, nDefault); }
    std::optional<int64_t> GetIntArg(const std::string& strArg) const { return GetArg<int64_t>(strArg); }

    bool GetBoolArg(const std::string& strArg, bool fDefault) const;
    std::optional<bool> GetBoolArg(const std::string& strArg) const;

    bool SoftSetArg(const std::string& strArg, const std::string& strValue);

    bool SoftSetBoolArg(const std::string& strArg, bool fValue);

    // Forces an arg setting. Called by SoftSetArg() if the arg hasn't already
    // been set. Also called directly in testing.
    void ForceSetArg(const std::string& strArg, const std::string& strValue);

    ChainType GetChainType() const;

    std::string GetChainTypeString() const;

    void AddArg(const std::string& name, const std::string& help, unsigned int flags, const OptionsCategory& cat);

    void AddCommand(const std::string& cmd, const std::string& help);

    void AddHiddenArgs(const std::vector<std::string>& args);

    void ClearArgs();

    void CheckMultipleCLIArgs() const;

    std::string GetHelpMessage() const;

    std::optional<unsigned int> GetArgFlags(const std::string& name) const;

    void SetDefaultFlags(std::optional<unsigned int>);

    bool GetSettingsPath(fs::path* filepath = nullptr, bool temp = false, bool backup = false) const;

    bool ReadSettingsFile(std::vector<std::string>* errors = nullptr);

    bool WriteSettingsFile(std::vector<std::string>* errors = nullptr, bool backup = false) const;

    common::SettingsValue GetPersistentSetting(const std::string& name) const;

    template <typename Fn>
    void LockSettings(Fn&& fn)
    {
        LOCK(cs_args);
        fn(m_settings);
    }

    void LogArgs() const;

private:
    fs::path GetDataDir(bool net_specific) const;

    std::variant<ChainType, std::string> GetChainArg() const;

    // Helper function for LogArgs().
    void logArgsPrefix(
        const std::string& prefix,
        const std::string& section,
        const std::map<std::string, std::vector<common::SettingsValue>>& args) const;
};

extern ArgsManager gArgs;

bool HelpRequested(const ArgsManager& args);

void SetupHelpOptions(ArgsManager& args);

extern const std::vector<std::string> TEST_OPTIONS_DOC;

bool HasTestOption(const ArgsManager& args, const std::string& test_option);

std::string HelpMessageGroup(const std::string& message);

std::string HelpMessageOpt(const std::string& option, const std::string& message);

#endif // BITCOIN_COMMON_ARGS_H