Merge main into async changes

.github/.codecov.yaml

@@ -33,3 +33,10 @@ comment:
 # to coverage report file paths.
 fixes:
   - "/home/runner/::"
+
+ignore:
+  - "docs/**/*"
+  - "docker/**/*"
+  - "examples/**/*"
+  - "**/test/**/*"
+  - "**.md"

.github/workflows/codeql-analysis.yml

@@ -23,10 +23,10 @@ jobs:
         sudo ./ci/setup_cmake.sh
         sudo ./ci/setup_ci_environment.sh
     - name: Initialize CodeQL
-      uses: github/codeql-action/init@v1
+      uses: github/codeql-action/init@v2
       with:
        languages: cpp
     - name: Autobuild
-      uses: github/codeql-action/autobuild@v1
+      uses: github/codeql-action/autobuild@v2
     - name: Perform CodeQL Analysis
-      uses: github/codeql-action/analyze@v1
+      uses: github/codeql-action/analyze@v2

.github/workflows/dependencies_image.yml

@@ -14,14 +14,14 @@ jobs:
       uses: actions/checkout@v2
     -
       name: Set up QEMU
-      uses: docker/setup-qemu-action@v1
+      uses: docker/setup-qemu-action@v2
     -
       name: Set up Docker Buildx
       id: buildx
-      uses: docker/setup-buildx-action@v1
+      uses: docker/setup-buildx-action@v2
     -
       name: Build Image
-      uses: docker/build-push-action@v2
+      uses: docker/build-push-action@v3
       with:
         builder: ${{ steps.buildx.outputs.name }}
         context: ci/

CMakeLists.txt

@@ -275,7 +275,10 @@ if(WITH_PROMETHEUS)
   if(NOT prometheus-cpp_FOUND)
     message("Trying to use local prometheus-cpp from submodule")
     if(EXISTS ${PROJECT_SOURCE_DIR}/third_party/prometheus-cpp/.git)
+      set(SAVED_ENABLE_TESTING ${ENABLE_TESTING})
+      set(ENABLE_TESTING OFF)
       add_subdirectory(third_party/prometheus-cpp)
+      set(ENABLE_TESTING ${SAVED_ENABLE_TESTING})
     else()
       message(
         FATAL_ERROR
@@ -362,7 +365,7 @@ if(BUILD_TESTING)
         ${CMAKE_BINARY_DIR}/lib/libgmock.a)
   elseif(WIN32)
     # Make sure we are always bootsrapped with vcpkg on Windows
-    find_package(GTest)
+    find_package(GTest REQUIRED)
     if(NOT (GTEST_FOUND OR GTest_FOUND))
       install_windows_deps()
       find_package(GTest REQUIRED)

api/include/opentelemetry/baggage/baggage.h

@@ -25,11 +25,12 @@ class Baggage
   static constexpr char kMembersSeparator   = ',';
   static constexpr char kMetadataSeparator  = ';';
 
-  Baggage() : kv_properties_(new opentelemetry::common::KeyValueProperties()) {}
-  Baggage(size_t size) : kv_properties_(new opentelemetry::common::KeyValueProperties(size)){};
+  Baggage() noexcept : kv_properties_(new opentelemetry::common::KeyValueProperties()) {}
+  Baggage(size_t size) noexcept
+      : kv_properties_(new opentelemetry::common::KeyValueProperties(size)){};
 
   template <class T>
-  Baggage(const T &keys_and_values)
+  Baggage(const T &keys_and_values) noexcept
       : kv_properties_(new opentelemetry::common::KeyValueProperties(keys_and_values))
   {}
 
@@ -42,15 +43,16 @@ class Baggage
   /* Get value for key in the baggage
      @returns true if key is found, false otherwise
   */
-  bool GetValue(nostd::string_view key, std::string &value) const
+  bool GetValue(nostd::string_view key, std::string &value) const noexcept
   {
     return kv_properties_->GetValue(key, value);
   }
 
   /* Returns shared_ptr of new baggage object which contains new key-value pair. If key or value is
      invalid, copy of current baggage is returned
   */
-  nostd::shared_ptr<Baggage> Set(const nostd::string_view &key, const nostd::string_view &value)
+  nostd::shared_ptr<Baggage> Set(const nostd::string_view &key,
+                                 const nostd::string_view &value) noexcept
   {
 
     nostd::shared_ptr<Baggage> baggage(new Baggage(kv_properties_->Size() + 1));
@@ -89,7 +91,7 @@ class Baggage
   // if key does not exist, copy of current baggage is returned.
   // Validity of key is not checked as invalid keys should never be populated in baggage in the
   // first place.
-  nostd::shared_ptr<Baggage> Delete(nostd::string_view key)
+  nostd::shared_ptr<Baggage> Delete(nostd::string_view key) noexcept
   {
     // keeping size of baggage same as key might not be found in it
     nostd::shared_ptr<Baggage> baggage(new Baggage(kv_properties_->Size()));
@@ -103,7 +105,7 @@ class Baggage
   }
 
   // Returns shared_ptr of baggage after extracting key-value pairs from header
-  static nostd::shared_ptr<Baggage> FromHeader(nostd::string_view header)
+  static nostd::shared_ptr<Baggage> FromHeader(nostd::string_view header) noexcept
   {
     if (header.size() > kMaxSize)
     {
@@ -158,7 +160,7 @@ class Baggage
   }
 
   // Creates string from baggage object.
-  std::string ToHeader() const
+  std::string ToHeader() const noexcept
   {
     std::string header_s;
     bool first = true;
@@ -249,7 +251,9 @@ class Baggage
     };
 
     auto from_hex = [](char c) -> char {
-      return std::isdigit(c) ? c - '0' : std::toupper(c) - 'A' + 10;
+      // c - '0' produces integer type which could trigger error/warning when casting to char,
+      // but the cast is safe here.
+      return static_cast<char>(std::isdigit(c) ? c - '0' : std::toupper(c) - 'A' + 10);
     };
 
     std::string ret;

api/include/opentelemetry/baggage/baggage_context.h

@@ -16,7 +16,7 @@ namespace baggage
 static const std::string kBaggageHeader = "baggage";
 
 inline nostd::shared_ptr<opentelemetry::baggage::Baggage> GetBaggage(
-    const opentelemetry::context::Context &context)
+    const opentelemetry::context::Context &context) noexcept
 {
   context::ContextValue context_value = context.GetValue(kBaggageHeader);
   if (nostd::holds_alternative<nostd::shared_ptr<opentelemetry::baggage::Baggage>>(context_value))
@@ -28,8 +28,9 @@ inline nostd::shared_ptr<opentelemetry::baggage::Baggage> GetBaggage(
   return empty_baggage;
 }
 
-inline context::Context SetBaggage(opentelemetry::context::Context &context,
-                                   nostd::shared_ptr<opentelemetry::baggage::Baggage> baggage)
+inline context::Context SetBaggage(
+    opentelemetry::context::Context &context,
+    nostd::shared_ptr<opentelemetry::baggage::Baggage> baggage) noexcept
 {
   return context.SetValue(kBaggageHeader, baggage);
 }

api/include/opentelemetry/baggage/propagation/baggage_propagator.h

@@ -21,15 +21,27 @@ class BaggagePropagator : public opentelemetry::context::propagation::TextMapPro
               const opentelemetry::context::Context &context) noexcept override
   {
     auto baggage = opentelemetry::baggage::GetBaggage(context);
-    carrier.Set(kBaggageHeader, baggage->ToHeader());
+    auto header  = baggage->ToHeader();
+    if (header.size())
+    {
+      carrier.Set(kBaggageHeader, header);
+    }
   }
 
   context::Context Extract(const opentelemetry::context::propagation::TextMapCarrier &carrier,
                            opentelemetry::context::Context &context) noexcept override
   {
     nostd::string_view baggage_str = carrier.Get(opentelemetry::baggage::kBaggageHeader);
     auto baggage                   = opentelemetry::baggage::Baggage::FromHeader(baggage_str);
-    return opentelemetry::baggage::SetBaggage(context, baggage);
+
+    if (baggage->ToHeader().size())
+    {
+      return opentelemetry::baggage::SetBaggage(context, baggage);
+    }
+    else
+    {
+      return context;
+    }
   }
 
   bool Fields(nostd::function_ref<bool(nostd::string_view)> callback) const noexcept override

api/include/opentelemetry/common/kv_properties.h

@@ -33,7 +33,7 @@ class KeyValueStringTokenizer
 public:
   KeyValueStringTokenizer(
       nostd::string_view str,
-      const KeyValueStringTokenizerOptions &opts = KeyValueStringTokenizerOptions())
+      const KeyValueStringTokenizerOptions &opts = KeyValueStringTokenizerOptions()) noexcept
       : str_(str), opts_(opts), index_(0)
   {}
 
@@ -48,7 +48,7 @@ class KeyValueStringTokenizer
   // @param key : key in kv pair
   // @param key : value in kv pair
   // @returns true if next kv pair was found, false otherwise.
-  bool next(bool &valid_kv, nostd::string_view &key, nostd::string_view &value)
+  bool next(bool &valid_kv, nostd::string_view &key, nostd::string_view &value) noexcept
   {
     valid_kv = true;
     while (index_ < str_.size())
@@ -170,13 +170,13 @@ class KeyValueProperties
     }
 
     // Gets the key associated with this entry.
-    nostd::string_view GetKey() const { return key_.get(); }
+    nostd::string_view GetKey() const noexcept { return key_.get(); }
 
     // Gets the value associated with this entry.
-    nostd::string_view GetValue() const { return value_.get(); }
+    nostd::string_view GetValue() const noexcept { return value_.get(); }
 
     // Sets the value for this entry. This overrides the previous value.
-    void SetValue(nostd::string_view value) { value_ = CopyStringToPointer(value); }
+    void SetValue(nostd::string_view value) noexcept { value_ = CopyStringToPointer(value); }
 
   private:
     // Store key and value as raw char pointers to avoid using std::string.
@@ -206,15 +206,15 @@ class KeyValueProperties
 public:
   // Create Key-value list of given size
   // @param size : Size of list.
-  KeyValueProperties(size_t size)
+  KeyValueProperties(size_t size) noexcept
       : num_entries_(0), max_num_entries_(size), entries_(new Entry[size])
   {}
 
   // Create Empty Key-Value list
-  KeyValueProperties() : num_entries_(0), max_num_entries_(0), entries_(nullptr) {}
+  KeyValueProperties() noexcept : num_entries_(0), max_num_entries_(0), entries_(nullptr) {}
 
   template <class T, class = typename std::enable_if<detail::is_key_value_iterable<T>::value>::type>
-  KeyValueProperties(const T &keys_and_values)
+  KeyValueProperties(const T &keys_and_values) noexcept
       : num_entries_(0),
         max_num_entries_(keys_and_values.size()),
         entries_(new Entry[max_num_entries_])
@@ -227,7 +227,7 @@ class KeyValueProperties
   }
 
   // Adds new kv pair into kv properties
-  void AddEntry(nostd::string_view key, nostd::string_view value)
+  void AddEntry(nostd::string_view key, nostd::string_view value) noexcept
   {
     if (num_entries_ < max_num_entries_)
     {
@@ -238,7 +238,7 @@ class KeyValueProperties
 
   // Returns all kv pair entries
   bool GetAllEntries(
-      nostd::function_ref<bool(nostd::string_view, nostd::string_view)> callback) const
+      nostd::function_ref<bool(nostd::string_view, nostd::string_view)> callback) const noexcept
   {
     for (size_t i = 0; i < num_entries_; i++)
     {
@@ -252,7 +252,7 @@ class KeyValueProperties
   }
 
   // Return value for key if exists, return false otherwise
-  bool GetValue(nostd::string_view key, std::string &value) const
+  bool GetValue(nostd::string_view key, std::string &value) const noexcept
   {
     for (size_t i = 0; i < num_entries_; i++)
     {

api/include/opentelemetry/common/string_util.h

@@ -26,7 +26,7 @@ namespace common
 class StringUtil
 {
 public:
-  static nostd::string_view Trim(nostd::string_view str, size_t left, size_t right)
+  static nostd::string_view Trim(nostd::string_view str, size_t left, size_t right) noexcept
   {
     while (str[static_cast<std::size_t>(left)] == ' ' && left <= right)
     {
@@ -39,7 +39,7 @@ class StringUtil
     return str.substr(left, 1 + right - left);
   }
 
-  static nostd::string_view Trim(nostd::string_view str)
+  static nostd::string_view Trim(nostd::string_view str) noexcept
   {
     if (str.empty())
     {

api/include/opentelemetry/context/context.h

@@ -24,14 +24,14 @@ class Context
   // Creates a context object from a map of keys and identifiers, this will
   // hold a shared_ptr to the head of the DataList linked list
   template <class T>
-  Context(const T &keys_and_values)
+  Context(const T &keys_and_values) noexcept
   {
     head_ = nostd::shared_ptr<DataList>{new DataList(keys_and_values)};
   }
 
   // Creates a context object from a key and value, this will
   // hold a shared_ptr to the head of the DataList linked list
-  Context(nostd::string_view key, ContextValue value)
+  Context(nostd::string_view key, ContextValue value) noexcept
   {
     head_ = nostd::shared_ptr<DataList>{new DataList(key, value)};
   }

api/include/opentelemetry/context/propagation/composite_propagator.h

@@ -1,6 +1,8 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
+#pragma once
+
 #include <initializer_list>
 #include <memory>
 #include <vector>

api/include/opentelemetry/context/runtime_context.h

@@ -173,7 +173,7 @@ class RuntimeContext
   }
 };
 
-inline Token::~Token()
+inline Token::~Token() noexcept
 {
   context::RuntimeContext::Detach(*this);
 }

api/include/opentelemetry/trace/context.h

@@ -12,7 +12,7 @@ namespace trace
 {
 
 // Get Span from explicit context
-inline nostd::shared_ptr<Span> GetSpan(const opentelemetry::context::Context &context)
+inline nostd::shared_ptr<Span> GetSpan(const opentelemetry::context::Context &context) noexcept
 {
   context::ContextValue span = context.GetValue(kSpanKey);
   if (nostd::holds_alternative<nostd::shared_ptr<Span>>(span))
@@ -24,7 +24,7 @@ inline nostd::shared_ptr<Span> GetSpan(const opentelemetry::context::Context &co
 
 // Set Span into explicit context
 inline context::Context SetSpan(opentelemetry::context::Context &context,
-                                nostd::shared_ptr<Span> span)
+                                nostd::shared_ptr<Span> span) noexcept
 {
   return context.SetValue(kSpanKey, span);
 }

api/include/opentelemetry/trace/default_span.h

@@ -50,13 +50,13 @@ class DefaultSpan : public Span
 
   void End(const EndSpanOptions & /* options */ = {}) noexcept {}
 
-  nostd::string_view ToString() { return "DefaultSpan"; }
+  nostd::string_view ToString() const noexcept { return "DefaultSpan"; }
 
-  DefaultSpan(SpanContext span_context) : span_context_(span_context) {}
+  DefaultSpan(SpanContext span_context) noexcept : span_context_(span_context) {}
 
   // movable and copiable
-  DefaultSpan(DefaultSpan &&spn) : span_context_(spn.GetContext()) {}
-  DefaultSpan(const DefaultSpan &spn) : span_context_(spn.GetContext()) {}
+  DefaultSpan(DefaultSpan &&spn) noexcept : span_context_(spn.GetContext()) {}
+  DefaultSpan(const DefaultSpan &spn) noexcept : span_context_(spn.GetContext()) {}
 
 private:
   SpanContext span_context_;

api/include/opentelemetry/trace/noop.h

@@ -100,14 +100,15 @@ class NoopTracer final : public Tracer, public std::enable_shared_from_this<Noop
 class NoopTracerProvider final : public opentelemetry::trace::TracerProvider
 {
 public:
-  NoopTracerProvider()
+  NoopTracerProvider() noexcept
       : tracer_{nostd::shared_ptr<opentelemetry::trace::NoopTracer>(
             new opentelemetry::trace::NoopTracer)}
   {}
 
-  nostd::shared_ptr<opentelemetry::trace::Tracer> GetTracer(nostd::string_view library_name,
-                                                            nostd::string_view library_version,
-                                                            nostd::string_view schema_url) override
+  nostd::shared_ptr<opentelemetry::trace::Tracer> GetTracer(
+      nostd::string_view library_name,
+      nostd::string_view library_version,
+      nostd::string_view schema_url) noexcept override
   {
     return tracer_;
   }

api/include/opentelemetry/trace/propagation/http_trace_context.h

@@ -100,7 +100,11 @@ class HttpTraceContext : public opentelemetry::context::propagation::TextMapProp
         nostd::span<char, 2>{&trace_parent[kTraceIdSize + kSpanIdSize + 5], 2});
 
     carrier.Set(kTraceParent, nostd::string_view(trace_parent, sizeof(trace_parent)));
-    carrier.Set(kTraceState, span_context.trace_state()->ToHeader());
+    const auto trace_state = span_context.trace_state()->ToHeader();
+    if (!trace_state.empty())
+    {
+      carrier.Set(kTraceState, trace_state);
+    }
   }
 
   static SpanContext ExtractContextFromTraceHeaders(nostd::string_view trace_parent,

api/include/opentelemetry/trace/span_context.h

@@ -26,7 +26,7 @@ class SpanContext final
    * sampled
    * @param is_remote true if this context was propagated from a remote parent.
    */
-  SpanContext(bool sampled_flag, bool is_remote)
+  SpanContext(bool sampled_flag, bool is_remote) noexcept
       : trace_id_(),
         span_id_(),
         trace_flags_(opentelemetry::trace::TraceFlags((uint8_t)sampled_flag)),