ceph/src/include/uuid.h

   1 #ifndef _CEPH_UUID_H
   2 #define _CEPH_UUID_H
   3
   4 /*
   5  * Thin C++ wrapper around libuuid.
   6  */
   7
   8 #include "encoding.h"
   9 #include <ostream>
  10
  11 #include <boost/uuid/uuid.hpp>
  12 #include <boost/uuid/uuid_generators.hpp>
  13 #include <boost/uuid/uuid_io.hpp>
  14 #include <boost/random/random_device.hpp>
  15
  16 struct uuid_d {
  17   boost::uuids::uuid uuid;
  18
  19   uuid_d() {
  20     boost::uuids::nil_generator gen;
  21     uuid = gen();
  22   }
  23
  24   bool is_zero() const {
  25     return uuid.is_nil();
  26   }
  27
  28   void generate_random() {
  29     boost::random::random_device rng("/dev/urandom");
  30     boost::uuids::basic_random_generator<boost::random::random_device> gen(&rng);
  31     uuid = gen();
  32   }
  33
  34   bool parse(const char *s) {
  35     try {
  36       boost::uuids::string_generator gen;
  37       uuid = gen(s);
  38       return true;
  39     } catch (std::runtime_error& e) {
  40       return false;
  41     }
  42   }
  43   void print(char *s) const {
  44     memcpy(s, boost::uuids::to_string(uuid).c_str(), 37);
  45   }
  46
  47  std::string to_string() const {
  48     return boost::uuids::to_string(uuid);
  49   }
  50
  51   char *bytes() const {
  52     return (char*)uuid.data;
  53   }
  54
  55   void encode(bufferlist& bl) const {
  56     ::encode_raw(uuid, bl);
  57   }
  58
  59   void decode(bufferlist::iterator& p) const {
  60     ::decode_raw(uuid, p);
  61   }
  62 };
  63 WRITE_CLASS_ENCODER(uuid_d)
  64
  65 inline std::ostream& operator<<(std::ostream& out, const uuid_d& u) {
  66   char b[37];
  67   u.print(b);
  68   return out << b;
  69 }
  70
  71 inline bool operator==(const uuid_d& l, const uuid_d& r) {
  72   return l.uuid == r.uuid;
  73 }
  74 inline bool operator!=(const uuid_d& l, const uuid_d& r) {
  75   return l.uuid != r.uuid;
  76 }
  77 inline bool operator<(const uuid_d& l, const uuid_d& r) {
  78   return l.to_string() < r.to_string();
  79 }
  80
  81
  82 #endif