src/util.h

   1 // Copyright (c) 2009-2010 Satoshi Nakamoto
   2 // Copyright (c) 2009-2016 The Bitcoin Core developers
   3 // Distributed under the MIT software license, see the accompanying
   4 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
   5
   6 /**
   7  * Server/client environment: argument handling, config file parsing,
   8  * logging, thread wrappers, startup time
   9  */
  10 #ifndef BITCOIN_UTIL_H
  11 #define BITCOIN_UTIL_H
  12
  13 #if defined(HAVE_CONFIG_H)
  14 #include "config/bitcoin-config.h"
  15 #endif
  16
  17 #include "compat.h"
  18 #include "fs.h"
  19 #include "sync.h"
  20 #include "tinyformat.h"
  21 #include "utiltime.h"
  22
  23 #include <atomic>
  24 #include <exception>
  25 #include <map>
  26 #include <stdint.h>
  27 #include <string>
  28 #include <vector>
  29
  30 #include <boost/signals2/signal.hpp>
  31
  32 // Application startup time (used for uptime calculation)
  33 int64_t GetStartupTime();
  34
  35 static const bool DEFAULT_LOGTIMEMICROS = false;
  36 static const bool DEFAULT_LOGIPS        = false;
  37 static const bool DEFAULT_LOGTIMESTAMPS = true;
  38
  39 /** Signals for translation. */
  40 class CTranslationInterface
  41 {
  42 public:
  43     /** Translate a message to the native language of the user. */
  44     boost::signals2::signal<std::string (const char* psz)> Translate;
  45 };
  46
  47 extern bool fPrintToConsole;
  48 extern bool fPrintToDebugLog;
  49
  50 extern bool fLogTimestamps;
  51 extern bool fLogTimeMicros;
  52 extern bool fLogIPs;
  53 extern std::atomic<bool> fReopenDebugLog;
  54 extern CTranslationInterface translationInterface;
  55
  56 extern const char * const BITCOIN_CONF_FILENAME;
  57 extern const char * const BITCOIN_PID_FILENAME;
  58
  59 extern std::atomic<uint32_t> logCategories;
  60
  61 /**
  62  * Translation function: Call Translate signal on UI interface, which returns a boost::optional result.
  63  * If no translation slot is registered, nothing is returned, and simply return the input.
  64  */
  65 inline std::string _(const char* psz)
  66 {
  67     boost::optional<std::string> rv = translationInterface.Translate(psz);
  68     return rv ? (*rv) : psz;
  69 }
  70
  71 void SetupEnvironment();
  72 bool SetupNetworking();
  73
  74 struct CLogCategoryActive
  75 {
  76     std::string category;
  77     bool active;
  78 };
  79
  80 namespace BCLog {
  81     enum LogFlags : uint32_t {
  82         NONE        = 0,
  83         NET         = (1 <<  0),
  84         TOR         = (1 <<  1),
  85         MEMPOOL     = (1 <<  2),
  86         HTTP        = (1 <<  3),
  87         BENCH       = (1 <<  4),
  88         ZMQ         = (1 <<  5),
  89         DB          = (1 <<  6),
  90         RPC         = (1 <<  7),
  91         ESTIMATEFEE = (1 <<  8),
  92         ADDRMAN     = (1 <<  9),
  93         SELECTCOINS = (1 << 10),
  94         REINDEX     = (1 << 11),
  95         CMPCTBLOCK  = (1 << 12),
  96         RAND        = (1 << 13),
  97         PRUNE       = (1 << 14),
  98         PROXY       = (1 << 15),
  99         MEMPOOLREJ  = (1 << 16),
 100         LIBEVENT    = (1 << 17),
 101         COINDB      = (1 << 18),
 102         QT          = (1 << 19),
 103         LEVELDB     = (1 << 20),
 104         ALL         = ~(uint32_t)0,
 105     };
 106 }
 107 /** Return true if log accepts specified category */
 108 static inline bool LogAcceptCategory(uint32_t category)
 109 {
 110     return (logCategories.load(std::memory_order_relaxed) & category) != 0;
 111 }
 112
 113 /** Returns a string with the log categories. */
 114 std::string ListLogCategories();
 115
 116 /** Returns a vector of the active log categories. */
 117 std::vector<CLogCategoryActive> ListActiveLogCategories();
 118
 119 /** Return true if str parses as a log category and set the flags in f */
 120 bool GetLogCategory(uint32_t *f, const std::string *str);
 121
 122 /** Send a string to the log output */
 123 int LogPrintStr(const std::string &str);
 124
 125 /** Get format string from VA_ARGS for error reporting */
 126 template<typename... Args> std::string FormatStringFromLogArgs(const char *fmt, const Args&... args) { return fmt; }
 127
 128 static inline void MarkUsed() {}
 129 template<typename T, typename... Args> static inline void MarkUsed(const T& t, const Args&... args)
 130 {
 131     (void)t;
 132     MarkUsed(args...);
 133 }
 134
 135 #ifdef USE_COVERAGE
 136 #define LogPrintf(...) do { MarkUsed(__VA_ARGS__); } while(0)
 137 #define LogPrint(category, ...) do { MarkUsed(__VA_ARGS__); } while(0)
 138 #else
 139 #define LogPrintf(...) do { \
 140     std::string _log_msg_; /* Unlikely name to avoid shadowing variables */ \
 141     try { \
 142         _log_msg_ = tfm::format(__VA_ARGS__); \
 143     } catch (tinyformat::format_error &fmterr) { \
 144         /* Original format string will have newline so don't add one here */ \
 145         _log_msg_ = "Error \"" + std::string(fmterr.what()) + "\" while formatting log message: " + FormatStringFromLogArgs(__VA_ARGS__); \
 146     } \
 147     LogPrintStr(_log_msg_); \
 148 } while(0)
 149
 150 #define LogPrint(category, ...) do { \
 151     if (LogAcceptCategory((category))) { \
 152         LogPrintf(__VA_ARGS__); \
 153     } \
 154 } while(0)
 155 #endif
 156
 157 template<typename... Args>
 158 bool error(const char* fmt, const Args&... args)
 159 {
 160     LogPrintStr("ERROR: " + tfm::format(fmt, args...) + "\n");
 161     return false;
 162 }
 163
 164 void PrintExceptionContinue(const std::exception *pex, const char* pszThread);
 165 void FileCommit(FILE *file);
 166 bool TruncateFile(FILE *file, unsigned int length);
 167 int RaiseFileDescriptorLimit(int nMinFD);
 168 void AllocateFileRange(FILE *file, unsigned int offset, unsigned int length);
 169 bool RenameOver(fs::path src, fs::path dest);
 170 bool TryCreateDirectories(const fs::path& p);
 171 fs::path GetDefaultDataDir();
 172 const fs::path &GetDataDir(bool fNetSpecific = true);
 173 void ClearDatadirCache();
 174 fs::path GetConfigFile(const std::string& confPath);
 175 #ifndef WIN32
 176 fs::path GetPidFile();
 177 void CreatePidFile(const fs::path &path, pid_t pid);
 178 #endif
 179 #ifdef WIN32
 180 fs::path GetSpecialFolderPath(int nFolder, bool fCreate = true);
 181 #endif
 182 void OpenDebugLog();
 183 void ShrinkDebugFile();
 184 void runCommand(const std::string& strCommand);
 185
 186 inline bool IsSwitchChar(char c)
 187 {
 188 #ifdef WIN32
 189     return c == '-' || c == '/';
 190 #else
 191     return c == '-';
 192 #endif
 193 }
 194
 195 class ArgsManager
 196 {
 197 protected:
 198     mutable CCriticalSection cs_args;
 199     std::map<std::string, std::string> mapArgs;
 200     std::map<std::string, std::vector<std::string>> mapMultiArgs;
 201 public:
 202     void ParseParameters(int argc, const char*const argv[]);
 203     void ReadConfigFile(const std::string& confPath);
 204
 205     /**
 206      * Return a vector of strings of the given argument
 207      *
 208      * @param strArg Argument to get (e.g. "-foo")
 209      * @return command-line arguments
 210      */
 211     std::vector<std::string> GetArgs(const std::string& strArg) const;
 212
 213     /**
 214      * Return true if the given argument has been manually set
 215      *
 216      * @param strArg Argument to get (e.g. "-foo")
 217      * @return true if the argument has been set
 218      */
 219     bool IsArgSet(const std::string& strArg) const;
 220
 221     /**
 222      * Return string argument or default value
 223      *
 224      * @param strArg Argument to get (e.g. "-foo")
 225      * @param strDefault (e.g. "1")
 226      * @return command-line argument or default value
 227      */
 228     std::string GetArg(const std::string& strArg, const std::string& strDefault) const;
 229
 230     /**
 231      * Return integer argument or default value
 232      *
 233      * @param strArg Argument to get (e.g. "-foo")
 234      * @param nDefault (e.g. 1)
 235      * @return command-line argument (0 if invalid number) or default value
 236      */
 237     int64_t GetArg(const std::string& strArg, int64_t nDefault) const;
 238
 239     /**
 240      * Return boolean argument or default value
 241      *
 242      * @param strArg Argument to get (e.g. "-foo")
 243      * @param fDefault (true or false)
 244      * @return command-line argument or default value
 245      */
 246     bool GetBoolArg(const std::string& strArg, bool fDefault) const;
 247
 248     /**
 249      * Set an argument if it doesn't already have a value
 250      *
 251      * @param strArg Argument to set (e.g. "-foo")
 252      * @param strValue Value (e.g. "1")
 253      * @return true if argument gets set, false if it already had a value
 254      */
 255     bool SoftSetArg(const std::string& strArg, const std::string& strValue);
 256
 257     /**
 258      * Set a boolean argument if it doesn't already have a value
 259      *
 260      * @param strArg Argument to set (e.g. "-foo")
 261      * @param fValue Value (e.g. false)
 262      * @return true if argument gets set, false if it already had a value
 263      */
 264     bool SoftSetBoolArg(const std::string& strArg, bool fValue);
 265
 266     // Forces an arg setting. Called by SoftSetArg() if the arg hasn't already
 267     // been set. Also called directly in testing.
 268     void ForceSetArg(const std::string& strArg, const std::string& strValue);
 269 };
 270
 271 extern ArgsManager gArgs;
 272
 273 /**
 274  * Format a string to be used as group of options in help messages
 275  *
 276  * @param message Group name (e.g. "RPC server options:")
 277  * @return the formatted string
 278  */
 279 std::string HelpMessageGroup(const std::string& message);
 280
 281 /**
 282  * Format a string to be used as option description in help messages
 283  *
 284  * @param option Option message (e.g. "-rpcuser=<user>")
 285  * @param message Option description (e.g. "Username for JSON-RPC connections")
 286  * @return the formatted string
 287  */
 288 std::string HelpMessageOpt(const std::string& option, const std::string& message);
 289
 290 /**
 291  * Return the number of physical cores available on the current system.
 292  * @note This does not count virtual cores, such as those provided by HyperThreading
 293  * when boost is newer than 1.56.
 294  */
 295 int GetNumCores();
 296
 297 void RenameThread(const char* name);
 298
 299 /**
 300  * .. and a wrapper that just calls func once
 301  */
 302 template <typename Callable> void TraceThread(const char* name,  Callable func)
 303 {
 304     std::string s = strprintf("bitcoin-%s", name);
 305     RenameThread(s.c_str());
 306     try
 307     {
 308         LogPrintf("%s thread start\n", name);
 309         func();
 310         LogPrintf("%s thread exit\n", name);
 311     }
 312     catch (const boost::thread_interrupted&)
 313     {
 314         LogPrintf("%s thread interrupt\n", name);
 315         throw;
 316     }
 317     catch (const std::exception& e) {
 318         PrintExceptionContinue(&e, name);
 319         throw;
 320     }
 321     catch (...) {
 322         PrintExceptionContinue(nullptr, name);
 323         throw;
 324     }
 325 }
 326
 327 std::string CopyrightHolders(const std::string& strPrefix);
 328
 329 #endif // BITCOIN_UTIL_H