process: simplify the setup of async hooks trace events

- Remove `trace_category_state` from `Environment` - since this is
  only accessed in the bootstrap process and later in the
  trace category update handler, we could just pass the initial
  values into JS land via the trace_events binding, and pass
  the dynamic values directly to the handler later, instead of
  accessing them out-of-band via the AliasedBuffer.
- Instead of creating the hooks directly in
  `trace_events_async_hooks.js`, export the hook factory and
  create the hooks in trace category state toggle.

PR-URL: https://github.com/nodejs/node/pull/26062
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

1 files changed, 10 insertions, 3 deletions

diff --git a/src/node_trace_events.cc b/src/node_trace_events.cc
index 6a0d4f037a7..5e30df41c4f 100644
--- a/src/node_trace_events.cc
+++ b/src/node_trace_events.cc
@@ -1,6 +1,7 @@
 #include "base_object-inl.h"
 #include "env.h"
 #include "node.h"
+#include "node_internals.h"
 #include "node_v8_platform-inl.h"
 #include "tracing/agent.h"
 
@@ -10,6 +11,7 @@
 namespace node {
 
 using v8::Array;
+using v8::Boolean;
 using v8::Context;
 using v8::Function;
 using v8::FunctionCallbackInfo;
@@ -148,9 +150,14 @@ void NodeCategorySet::Initialize(Local<Object> target,
   target->Set(context, trace,
               binding->Get(context, trace).ToLocalChecked()).FromJust();
 
-  target->Set(context,
-              FIXED_ONE_BYTE_STRING(env->isolate(), "traceCategoryState"),
-              env->trace_category_state().GetJSArray()).FromJust();
+  // Initial value of async hook trace events
+  bool async_hooks_enabled = (*(TRACE_EVENT_API_GET_CATEGORY_GROUP_ENABLED(
+                                 TRACING_CATEGORY_NODE1(async_hooks)))) != 0;
+  target
+      ->Set(context,
+            FIXED_ONE_BYTE_STRING(env->isolate(), "asyncHooksEnabledInitial"),
+            Boolean::New(env->isolate(), async_hooks_enabled))
+      .FromJust();
 }
 
 }  // namespace node