args.h

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// Copyright (c) 2023 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 <compat.h>
#include <sync.h>
#include <util/chaintype.h>
#include <util/fs.h>
#include <util/settings.h>
 
#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 GetConfigFile(const ArgsManager &args,
                       const fs::path &configuration_file_path);
 
[[nodiscard]] bool ParseKeyValue(std::string &key,
                                 std::optional<std::string> &val);
 
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,
    AVALANCHE,
    CHRONIK,
 
    // Always the last option to avoid printing these in the help
    HIDDEN,
};
 
struct KeyInfo {
    std::string name;
    std::string section;
    bool negated{false};
};
 
KeyInfo InterpretKey(std::string key);
 
std::optional<util::SettingsValue>
InterpretValue(const KeyInfo &key, const std::optional<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 util::SettingsValue &, const std::string &);
std::optional<std::string> SettingToString(const util::SettingsValue &);
 
int64_t SettingToInt(const util::SettingsValue &, int64_t);
std::optional<int64_t> SettingToInt(const util::SettingsValue &);
 
bool SettingToBool(const util::SettingsValue &, bool);
std::optional<bool> SettingToBool(const util::SettingsValue &);
 
class ArgsManager {
public:
    enum Flags : uint32_t {
        ALLOW_ANY = 0x01,
        // ALLOW_BOOL = 0x02,
        // ALLOW_INT = 0x04,
        // ALLOW_STRING = 0x08,
        // ALLOW_LIST = 0x10,
        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,
    };
 
protected:
    struct Arg {
        std::string m_help_param;
        std::string m_help_text;
        unsigned int m_flags;
    };
 
    mutable RecursiveMutex cs_args;
    util::Settings m_settings 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::list<SectionInfo> m_config_sections 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:
    util::SettingsValue GetSetting(const std::string &arg) const;
 
    std::vector<util::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;
 
    [[nodiscard]] bool ReadConfigFiles(std::string &error,
                                       bool ignore_invalid_keys = false);
 
    std::set<std::string> GetUnsuitableSectionOnlyArgs() const;
 
    std::list<SectionInfo> GetUnrecognizedSections() 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;
 
    int64_t GetIntArg(const std::string &strArg, int64_t nDefault) const;
    std::optional<int64_t> GetIntArg(const std::string &strArg) const;
 
    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);
 
    // Forces a multi arg setting, used only in testing
    void ForceSetMultiArg(const std::string &strArg,
                          const std::vector<std::string> &values);
 
    ChainType GetChainType() const;
 
    std::string GetChainTypeString() const;
 
    void AddArg(const std::string &name, const std::string &help,
                unsigned int flags, const OptionsCategory &cat);
 
    void ClearForcedArg(const std::string &strArg);
 
    void AddHiddenArgs(const std::vector<std::string> &args);
 
    void ClearArgs() {
        LOCK(cs_args);
        m_available_args.clear();
        m_network_only_args.clear();
    }
 
    std::string GetHelpMessage() const;
 
    std::optional<unsigned int> GetArgFlags(const std::string &name) const;
 
    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;
 
    util::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<util::SettingsValue>>
                      &args) const;
};
 
extern ArgsManager gArgs;
 
bool HelpRequested(const ArgsManager &args);
 
void SetupHelpOptions(ArgsManager &args);
 
std::string HelpMessageGroup(const std::string &message);
 
std::string HelpMessageOpt(const std::string &option,
                           const std::string &message);
 
namespace common {
#ifdef WIN32
class WinCmdLineArgs {
public:
    WinCmdLineArgs();
    ~WinCmdLineArgs();
    std::pair<int, char **> get();
 
private:
    int argc;
    char **argv;
    std::vector<std::string> args;
};
#endif
} // namespace common
 
#endif // BITCOIN_COMMON_ARGS_H