tracing-cloudchamber 0.1.0

Extend tracing with an ffi via cxx to emit events and create spans in C++
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148


#include "lib.h"
#include "rust/cxx.h"
#include "tracing-cloudchamber/src/lib.rs.h"
#include <atomic>
#include <cassert>
#include <iomanip>
#include <iostream>

namespace cloudchamber {

Interest Callsite::register_site() const {
  uint8_t expected = callsite::UNREGISTERED;
  if (registration.compare_exchange_strong(expected, callsite::REGISTERING,
                                           std::memory_order_acq_rel,
                                           std::memory_order_acquire)) {
    registration.store(callsite::REGISTERED, std::memory_order_release);
  } else {
    auto val = registration.load(std::memory_order_acquire);
    if (val != callsite::REGISTERED) {
      assert(val == callsite::REGISTERING);
      return {::cloudchamber::detail::InterestKind::SOMERTIMES};
    }
  }
  switch (interest.load(std::memory_order_relaxed)) {
  case callsite::INTEREST_NEVER:
    return {::cloudchamber::detail::InterestKind::NEVER};
  case callsite::INTEREST_ALWAYS:
    return {::cloudchamber::detail::InterestKind::ALWAYS};
  default:
    return {::cloudchamber::detail::InterestKind::SOMERTIMES};
  }
}

void Callsite::store_interest(const cloudchamber::Interest &intrst) const {
  uint8_t val;
  switch (intrst.value) {
  case ::cloudchamber::detail::InterestKind::ALWAYS:
    val = cloudchamber::callsite::INTEREST_ALWAYS;
    break;
  case ::cloudchamber::detail::InterestKind::NEVER:
    val = cloudchamber::callsite::INTEREST_NEVER;
    break;
  case ::cloudchamber::detail::InterestKind::SOMERTIMES:
  default:
    val = cloudchamber::callsite::INTEREST_SOMETIMES;
  }
  std::cout << "storing interest " << val << std::endl;
  interest.store(val, std::memory_order_seq_cst);
}

rust::Box<RustMetadata> const &Callsite::get_meta() const {
  if (!rust_meta.has_value()) {
    rust_meta.emplace(::cloudchamber::new_rust_metadata(*meta));
  }
  return rust_meta.value();
}

bool Callsite::is_enabled() const {
  return default_enabled_for_meta(get_interest(), get_meta());
}

Interest Callsite::get_interest() const {
  switch (interest.load(std::memory_order_relaxed)) {
  case ::cloudchamber::callsite::INTEREST_NEVER:
    return {::cloudchamber::detail::InterestKind::NEVER};
  case ::cloudchamber::callsite::INTEREST_ALWAYS:
    return {::cloudchamber::detail::InterestKind::ALWAYS};
  default:
    return register_site();
  }
}
void Callsite::set_metadata_ptr(const ::cloudchamber::Metadata *ptr) const {
  meta = ptr;
}

std::uint8_t const &FieldValue::get_u8() const noexcept {
  return rcast<std::uint8_t>();
}
std::uint16_t const &FieldValue::get_u16() const noexcept {
  return rcast<std::uint16_t>();
}
std::uint32_t const &FieldValue::get_u32() const noexcept {
  return rcast<std::uint32_t>();
}
std::uint64_t const &FieldValue::get_u64() const noexcept {
  return rcast<std::uint64_t>();
}
std::int8_t const &FieldValue::get_i8() const noexcept {
  return rcast<std::int8_t>();
}
std::int16_t const &FieldValue::get_i16() const noexcept {
  return rcast<std::int16_t>();
}
std::int32_t const &FieldValue::get_i32() const noexcept {
  return rcast<std::int32_t>();
}
std::int64_t const &FieldValue::get_i64() const noexcept {
  return rcast<std::int64_t>();
}
float const &FieldValue::get_f32() const noexcept { return rcast<float>(); }
double const &FieldValue::get_f64() const noexcept { return rcast<double>(); }
bool const &FieldValue::get_bool() const noexcept { return rcast<bool>(); }
rust::String const &FieldValue::get_string() const noexcept {
  _string = ::rust::String::lossy(cast<std::string>());
  return _string;
}
rust::String const &FieldValue::get_str() const noexcept {
  _string = rust::String::lossy(cast<std::string_view>().data());
  return _string;
}

rust::Box<DisplayValue> const &FieldValue::get_debug() const {
  if (debug_formater != nullptr) {
    _display.emplace(::cloudchamber::string_to_display_value(debug_formater()));
    return _display.value();
  } else {
    throw std::runtime_error("No debug formatter stored for this type.");
  }
}

ScopeLambda::ScopeLambda(std::function<void()> f) : f(f) {}

void ScopeLambda::call() const { f(); }

namespace util {

template <> std::string toString(std::string const &s) {
  std::ostringstream out;
  out << std::quoted(s);
  return out.str();
}

template <> std::string toString(std::string_view const &s) {
  std::ostringstream out;
  out << std::quoted(s);
  return out.str();
}

std::string toString(const char *s) {
  std::ostringstream out;
  out << std::quoted(s);
  return out.str();
}

} // namespace util

} // namespace cloudchamber