Add get_trace_context and apply in scope

sentry-ruby/lib/sentry/propagation_context.rb

@@ -10,5 +10,15 @@ def initialize
       @parent_span_id = nil
       @dynamic_sampling_context = nil
     end
+
+    # Returns the trace context that can be used to embed in an Event.
+    # @return [Hash]
+    def get_trace_context
+      {
+        trace_id: @trace_id,
+        span_id: @span_id,
+        parent_span_id: @parent_span_id
+      }
+    end
   end
 end

sentry-ruby/lib/sentry/scope.rb

@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 
 require "sentry/breadcrumb_buffer"
+require "sentry/propagation_context"
 require "etc"
 
 module Sentry
@@ -20,7 +21,8 @@ class Scope
       :event_processors,
       :rack_env,
       :span,
-      :session
+      :session,
+      :propagation_context
     ]
 
     attr_reader(*ATTRIBUTES)
@@ -50,7 +52,9 @@ def apply_to_event(event, hint = nil)
       event.transaction_info = { source: transaction_source } if transaction_source
 
       if span
-        event.contexts[:trace] = span.get_trace_context
+        event.contexts[:trace] ||= span.get_trace_context
+      else
+        event.contexts[:trace] ||= propagation_context.get_trace_context
       end
 
       event.fingerprint = fingerprint
@@ -95,6 +99,7 @@ def dup
       copy.fingerprint = fingerprint.deep_dup
       copy.span = span.deep_dup
       copy.session = session.deep_dup
+      copy.propagation_context = propagation_context.deep_dup
       copy
     end
 
@@ -111,6 +116,7 @@ def update_from_scope(scope)
       self.transaction_sources = scope.transaction_sources
       self.fingerprint = scope.fingerprint
       self.span = scope.span
+      self.propagation_context = scope.propagation_context
     end
 
     # Updates the scope's data from the given options.