Support running in situations where Gem.loaded_specs is not available

lib/datadog/profiling/collectors/info.rb

@@ -2,6 +2,7 @@
 
 require "set"
 require "time"
+require "libdatadog"
 
 module Datadog
   module Profiling
@@ -62,11 +63,19 @@ def collect_application_info(settings)
         def collect_profiler_info(settings)
           unless @profiler_info
             lib_datadog_gem = ::Gem.loaded_specs["libdatadog"]
+
+            libdatadog_version =
+              if lib_datadog_gem
+                "#{lib_datadog_gem.version}-#{lib_datadog_gem.platform}"
+              else
+                # In some cases, Gem.loaded_specs may not be available, as in
+                # https://github.com/DataDog/dd-trace-rb/pull/1506; let's use the version directly
+                "#{Libdatadog::VERSION}-(unknown)"
+              end
+
             @profiler_info = {
-              # TODO: If profiling is extracted and its version diverges from the datadog gem, this is inaccurate.
-              #       Update if this ever occurs.
               version: Datadog::Core::Environment::Identity.gem_datadog_version,
-              libdatadog: "#{lib_datadog_gem.version}-#{lib_datadog_gem.platform}",
+              libdatadog: libdatadog_version,
               settings: collect_settings_recursively(settings.profiling),
             }.freeze
           end

spec/datadog/profiling/collectors/info_spec.rb

@@ -88,6 +88,23 @@
         )
       end
     end
+
+    describe "libdatadog version reporting" do
+      it "reports the libdatadog version, including platform" do
+        libdatadog_gem = Gem.loaded_specs["libdatadog"]
+
+        expect(info.dig(:profiler, :libdatadog)).to eq("#{libdatadog_gem.version}-#{libdatadog_gem.platform}")
+      end
+
+      context "when libdatadog is not available in loaded_specs" do
+        it "reports the libdatadog version, with an unknown platform" do
+          expect(Gem.loaded_specs).to receive(:[]).with("libdatadog").and_return(nil)
+          allow(Gem.loaded_specs).to receive(:[]).and_call_original
+
+          expect(info.dig(:profiler, :libdatadog)).to eq("#{Libdatadog::VERSION}-(unknown)")
+        end
+      end
+    end
   end
 end
 

vendor/rbs/libdatadog/0/libdatadog.rbs

@@ -2,4 +2,6 @@ module Libdatadog
   def self.path_to_crashtracking_receiver_binary: () -> ::String?
   def self.ld_library_path: () -> ::String?
   def self.pkgconfig_folder: () -> ::String?
+
+  VERSION: ::String
 end