ceph/src/common/hobject_fmt.h

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3 #pragma once
   4
   5 /**
   6  * \file fmtlib formatters for some hobject.h classes
   7  */
   8 #include <fmt/format.h>
   9
  10 #include "common/hobject.h"
  11 #include "include/types_fmt.h"
  12 #include "msg/msg_fmt.h"
  13
  14 // \todo reimplement
  15 static inline void append_out_escaped(const std::string& in, std::string* out)
  16 {
  17   for (auto i = in.cbegin(); i != in.cend(); ++i) {
  18     if (*i == '%' || *i == ':' || *i == '/' || *i < 32 || *i >= 127) {
  19       char buf[4];
  20       snprintf(buf, sizeof(buf), "%%%02x", (int)(unsigned char)*i);
  21       out->append(buf);
  22     } else {
  23       out->push_back(*i);
  24     }
  25   }
  26 }
  27
  28 template <> struct fmt::formatter<hobject_t> {
  29
  30   constexpr auto parse(format_parse_context& ctx) { return ctx.begin(); }
  31
  32   template <typename FormatContext> auto format(const hobject_t& ho, FormatContext& ctx)
  33   {
  34     if (ho == hobject_t{}) {
  35       return fmt::format_to(ctx.out(), "MIN");
  36     }
  37
  38     if (ho.is_max()) {
  39       return fmt::format_to(ctx.out(), "MAX");
  40     }
  41
  42     std::string v;
  43     append_out_escaped(ho.nspace, &v);
  44     v.push_back(':');
  45     append_out_escaped(ho.get_key(), &v);
  46     v.push_back(':');
  47     append_out_escaped(ho.oid.name, &v);
  48
  49     return fmt::format_to(ctx.out(), "{}:{:08x}:{}:{}", static_cast<uint64_t>(ho.pool),
  50                           ho.get_bitwise_key_u32(), v, ho.snap);
  51   }
  52 };