Set attributes on span start

Author: Johannes Tax

api/include/opentelemetry/trace/span.h

@@ -37,12 +37,13 @@ struct StartSpanOptions
   core::SystemTimestamp start_system_time;
   core::SteadyTimestamp start_steady_time;
 
+  // Optionally set attributes at Span creation.
+  nostd::span<std::pair<nostd::string_view, common::AttributeValue>> attributes;
+
   // TODO:
   // Span(Context?) parent;
   // SpanContext remote_parent;
   // Links
-  // Attributes
-  nostd::span<std::pair<nostd::string_view, common::AttributeValue>> attributes;
   SpanKind kind = SpanKind::kInternal;
 };
 /**

examples/plugin/plugin/tracer.cc

@@ -2,9 +2,10 @@
 
 #include <iostream>
 
-namespace nostd = opentelemetry::nostd;
-namespace core  = opentelemetry::core;
-namespace trace = opentelemetry::trace;
+namespace nostd  = opentelemetry::nostd;
+namespace common = opentelemetry::common;
+namespace core   = opentelemetry::core;
+namespace trace  = opentelemetry::trace;
 
 namespace
 {
@@ -22,6 +23,10 @@ class Span final : public trace::Span
   ~Span() { std::cout << "~Span\n"; }
 
   // opentelemetry::trace::Span
+  void SetAttribute(nostd::string_view /*name*/,
+                    common::AttributeValue && /*value*/) noexcept override
+  {}
+
   void AddEvent(nostd::string_view /*name*/) noexcept override {}
 
   void AddEvent(nostd::string_view /*name*/, core::SystemTimestamp /*timestamp*/) noexcept override

sdk/include/opentelemetry/sdk/trace/span_data.h

@@ -72,9 +72,9 @@ class SpanData final : public Recordable
    * Get the attributes for this span
    * @return the attributes for this span
    */
-  const std::unordered_map<std::string, common::AttributeValue>& GetAttributes() const noexcept
+  const std::unordered_map<std::string, common::AttributeValue> &GetAttributes() const noexcept
   {
-      return attributes_;
+    return attributes_;
   }
 
   void SetIds(opentelemetry::trace::TraceId trace_id,

sdk/src/trace/span.cc

@@ -55,9 +55,10 @@ Span::Span(std::shared_ptr<Tracer> &&tracer,
   processor_->OnStart(*recordable_);
   recordable_->SetName(name);
 
-  for (auto& attr : options.attributes) {
-      auto value = attr.second;
-      recordable_->SetAttribute(attr.first, std::move(value));
+  for (auto &attr : options.attributes)
+  {
+    auto value = attr.second;
+    recordable_->SetAttribute(attr.first, std::move(value));
   }
 
   recordable_->SetStartTime(NowOr(options.start_system_time));

sdk/test/trace/span_data_test.cc

@@ -1,5 +1,5 @@
-#include "opentelemetry/nostd/variant.h"
 #include "opentelemetry/sdk/trace/span_data.h"
+#include "opentelemetry/nostd/variant.h"
 #include "opentelemetry/trace/span_id.h"
 #include "opentelemetry/trace/trace_id.h"
 

sdk/test/trace/tracer_test.cc

@@ -7,6 +7,8 @@
 using namespace opentelemetry::sdk::trace;
 using opentelemetry::core::SteadyTimestamp;
 using opentelemetry::core::SystemTimestamp;
+namespace nostd  = opentelemetry::nostd;
+namespace common = opentelemetry::common;
 
 /**
  * A mock exporter that switches a flag once a valid recordable was received.
@@ -23,8 +25,7 @@ class MockSpanExporter final : public SpanExporter
     return std::unique_ptr<Recordable>(new SpanData);
   }
 
-  ExportResult Export(
-      const opentelemetry::nostd::span<std::unique_ptr<Recordable>> &recordables) noexcept override
+  ExportResult Export(const nostd::span<std::unique_ptr<Recordable>> &recordables) noexcept override
   {
     for (auto &recordable : recordables)
     {
@@ -120,11 +121,8 @@ TEST(Tracer, StartSpanWithOptionsAttributes)
   auto tracer = initTracer(spans_received);
 
   opentelemetry::trace::StartSpanOptions start;
-  std::pair<opentelemetry::nostd::string_view, opentelemetry::common::AttributeValue> attributes[] = { 
-      {"attr1", 314159},
-      {"attr2", false}, 
-      {"attr3", "hi"} 
-  };
+  std::pair<nostd::string_view, common::AttributeValue> attributes[] = {
+      {"attr1", 314159}, {"attr2", false}, {"attr3", "string"}};
   start.attributes = attributes;
 
   tracer->StartSpan("span 1", start)->End();
@@ -133,7 +131,7 @@ TEST(Tracer, StartSpanWithOptionsAttributes)
 
   auto &span_data = spans_received->at(0);
   ASSERT_EQ(3, span_data->GetAttributes().size());
-  ASSERT_EQ(314159, opentelemetry::nostd::get<int>(span_data->GetAttributes().at("attr1")));
-  ASSERT_EQ(false, opentelemetry::nostd::get<bool>(span_data->GetAttributes().at("attr2")));
-  ASSERT_EQ("hi", opentelemetry::nostd::get<opentelemetry::nostd::string_view>(span_data->GetAttributes().at("attr3")));
+  ASSERT_EQ(314159, nostd::get<int>(span_data->GetAttributes().at("attr1")));
+  ASSERT_EQ(false, nostd::get<bool>(span_data->GetAttributes().at("attr2")));
+  ASSERT_EQ("string", nostd::get<nostd::string_view>(span_data->GetAttributes().at("attr3")));
 }