includes/opentelemetry/trace/span.h

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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
 
#pragma once
 
#include <cstdint>
 
#include "opentelemetry/common/attribute_value.h"
#include "opentelemetry/common/key_value_iterable_view.h"
#include "opentelemetry/nostd/span.h"
#include "opentelemetry/nostd/string_view.h"
#include "opentelemetry/nostd/type_traits.h"
#include "opentelemetry/trace/span_context.h"
#include "opentelemetry/trace/span_context_kv_iterable.h"
#include "opentelemetry/trace/span_context_kv_iterable_view.h"
#include "opentelemetry/trace/span_metadata.h"
 
#include "opentelemetry/version.h"
 
OPENTELEMETRY_BEGIN_NAMESPACE
namespace trace
{
 
class Tracer;
 
class Span
{
public:
  // Note that Spans should be created using the Tracer class. Please refer to
  // tracer.h for documentation.
  Span() = default;
 
  // The Span destructor End()s the Span, if it hasn't been ended already.
  virtual ~Span() = default;
 
  // Not copiable or movable.
  Span(const Span &)            = delete;
  Span(Span &&)                 = delete;
  Span &operator=(const Span &) = delete;
  Span &operator=(Span &&)      = delete;
 
  virtual void SetAttribute(nostd::string_view key,
                            const common::AttributeValue &value) noexcept = 0;
 
  // Adds an event to the Span.
  virtual void AddEvent(nostd::string_view name) noexcept = 0;
 
  // Adds an event to the Span, with a custom timestamp.
  virtual void AddEvent(nostd::string_view name, common::SystemTimestamp timestamp) noexcept = 0;
 
  // Adds an event to the Span, with a custom timestamp, and attributes.
  virtual void AddEvent(nostd::string_view name,
                        common::SystemTimestamp timestamp,
                        const common::KeyValueIterable &attributes) noexcept = 0;
 
  virtual void AddEvent(nostd::string_view name,
                        const common::KeyValueIterable &attributes) noexcept
  {
    this->AddEvent(name, std::chrono::system_clock::now(), attributes);
  }
 
  template <class T,
            nostd::enable_if_t<common::detail::is_key_value_iterable<T>::value> * = nullptr>
  void AddEvent(nostd::string_view name,
                common::SystemTimestamp timestamp,
                const T &attributes) noexcept
  {
    this->AddEvent(name, timestamp, common::KeyValueIterableView<T>{attributes});
  }
 
  template <class T,
            nostd::enable_if_t<common::detail::is_key_value_iterable<T>::value> * = nullptr>
  void AddEvent(nostd::string_view name, const T &attributes) noexcept
  {
    this->AddEvent(name, common::KeyValueIterableView<T>{attributes});
  }
 
  void AddEvent(nostd::string_view name,
                common::SystemTimestamp timestamp,
                std::initializer_list<std::pair<nostd::string_view, common::AttributeValue>>
                    attributes) noexcept
  {
    this->AddEvent(name, timestamp,
                   nostd::span<const std::pair<nostd::string_view, common::AttributeValue>>{
                       attributes.begin(), attributes.end()});
  }
 
  void AddEvent(nostd::string_view name,
                std::initializer_list<std::pair<nostd::string_view, common::AttributeValue>>
                    attributes) noexcept
  {
    this->AddEvent(name, std::chrono::system_clock::now(),
                   nostd::span<const std::pair<nostd::string_view, common::AttributeValue>>{
                       attributes.begin(), attributes.end()});
  }
 
#if OPENTELEMETRY_ABI_VERSION_NO >= 2
 
  virtual void AddLink(const SpanContext &target,
                       const common::KeyValueIterable &attrs) noexcept = 0;
 
  virtual void AddLinks(const SpanContextKeyValueIterable &links) noexcept = 0;
 
  template <class U,
            nostd::enable_if_t<common::detail::is_key_value_iterable<U>::value> * = nullptr>
  void AddLink(const SpanContext &target, const U &attrs)
  {
    common::KeyValueIterableView<U> view(attrs);
    this->AddLink(target, view);
  }
 
  void AddLink(const SpanContext &target,
               std::initializer_list<std::pair<nostd::string_view, common::AttributeValue>> attrs)
  {
    /* Build a container from std::initializer_list. */
    nostd::span<const std::pair<nostd::string_view, common::AttributeValue>> container{
        attrs.begin(), attrs.end()};
 
    /* Build a view on the container. */
    common::KeyValueIterableView<
        nostd::span<const std::pair<nostd::string_view, common::AttributeValue>>>
        view(container);
 
    return this->AddLink(target, view);
  }
 
  template <class U, nostd::enable_if_t<detail::is_span_context_kv_iterable<U>::value> * = nullptr>
  void AddLinks(const U &links)
  {
    SpanContextKeyValueIterableView<U> view(links);
    this->AddLinks(view);
  }
 
  void AddLinks(
      std::initializer_list<
          std::pair<SpanContext,
                    std::initializer_list<std::pair<nostd::string_view, common::AttributeValue>>>>
          links)
  {
    /* Build a container from std::initializer_list. */
    nostd::span<const std::pair<
        SpanContext, std::initializer_list<std::pair<nostd::string_view, common::AttributeValue>>>>
        container{links.begin(), links.end()};
 
    /* Build a view on the container. */
    SpanContextKeyValueIterableView<nostd::span<const std::pair<
        SpanContext, std::initializer_list<std::pair<nostd::string_view, common::AttributeValue>>>>>
        view(container);
 
    return this->AddLinks(view);
  }
 
#endif /* OPENTELEMETRY_ABI_VERSION_NO */
 
  // Sets the status of the span. The default status is Unset. Only the value of
  // the last call will be
  // recorded, and implementations are free to ignore previous calls.
  virtual void SetStatus(StatusCode code, nostd::string_view description = "") noexcept = 0;
 
  // Updates the name of the Span. If used, this will override the name provided
  // during creation.
  virtual void UpdateName(nostd::string_view name) noexcept = 0;
 
  virtual void End(const trace::EndSpanOptions &options = {}) noexcept = 0;
 
  virtual trace::SpanContext GetContext() const noexcept = 0;
 
  // Returns true if this Span is recording tracing events (e.g. SetAttribute,
  // AddEvent).
  virtual bool IsRecording() const noexcept = 0;
};
 
}  // namespace trace
OPENTELEMETRY_END_NAMESPACE