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src: add C++ support for diagnostics channels · nodejs/node@46ee1ed · GitHub

/ node Public

Commit 46ee1ed

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RafaelGSS
authored and
aduh95
committed
src: add C++ support for diagnostics channels
Add a C++ API for diagnostics channels that allows native code to check for subscribers and publish messages without unnecessary JS boundary crossings. Uses a shared AliasedUint32Array buffer between C++ and JS to track subscriber counts per channel, enabling a fast inline check (HasSubscribers) that reads the buffer directly. PR-URL: #61869 Reviewed-By: Stephen Belanger <admin@stephenbelanger.com>
1 parent 33a364c commit 46ee1ed

11 files changed

Lines changed: 697 additions & 1 deletion

‎lib/diagnostics_channel.js‎

Lines changed: 15 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -31,6 +31,9 @@ const {
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const { triggerUncaughtException } = internalBinding('errors');
3333

34+
const dc_binding = internalBinding('diagnostics_channel');
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const { subscribers: subscriberCounts } = dc_binding;
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const { WeakReference } = require('internal/util');
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// Can't delete when weakref count reaches 0 as it could increment again.
@@ -108,6 +111,7 @@ class ActiveChannel {
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this._subscribers = ArrayPrototypeSlice(this._subscribers);
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ArrayPrototypePush(this._subscribers, subscription);
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channels.incRef(this.name);
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if (this._index !== undefined) subscriberCounts[this._index]++;
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}
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unsubscribe(subscription) {
@@ -120,14 +124,18 @@ class ActiveChannel {
120124
ArrayPrototypePushApply(this._subscribers, after);
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channels.decRef(this.name);
127+
if (this._index !== undefined) subscriberCounts[this._index]--;
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maybeMarkInactive(this);
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return true;
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}
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128133
bindStore(store, transform) {
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const replacing = this._stores.has(store);
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if (!replacing) channels.incRef(this.name);
135+
if (!replacing) {
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channels.incRef(this.name);
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if (this._index !== undefined) subscriberCounts[this._index]++;
138+
}
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this._stores.set(store, transform);
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}
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@@ -139,6 +147,7 @@ class ActiveChannel {
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this._stores.delete(store);
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channels.decRef(this.name);
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if (this._index !== undefined) subscriberCounts[this._index]--;
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maybeMarkInactive(this);
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return true;
@@ -183,6 +192,9 @@ class Channel {
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this._subscribers = undefined;
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this._stores = undefined;
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this.name = name;
195+
if (typeof name === 'string') {
196+
this._index = dc_binding.getOrCreateChannelIndex(name);
197+
}
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channels.set(name, this);
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}
@@ -434,6 +446,8 @@ function tracingChannel(nameOrChannels) {
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return new TracingChannel(nameOrChannels);
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}
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449+
dc_binding.linkNativeChannel((name) => channel(name));
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module.exports = {
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channel,
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hasSubscribers,

‎lib/internal/process/pre_execution.js‎

Lines changed: 10 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -124,6 +124,8 @@ function prepareExecution(options) {
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// Process initial diagnostic reporting configuration, if present.
125125
initializeReport();
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127+
setupDiagnosticsChannel();
128+
127129
// Load permission system API
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initializePermission();
129131

@@ -604,6 +606,14 @@ function initializeClusterIPC() {
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}
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}
606608

609+
function setupDiagnosticsChannel() {
610+
// Re-link native channels after snapshot deserialization since
611+
// JS references are cleared during serialization.
612+
const dc = require('diagnostics_channel');
613+
const dc_binding = internalBinding('diagnostics_channel');
614+
dc_binding.linkNativeChannel((name) => dc.channel(name));
615+
}
616+
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function initializePermission() {
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const permission = getOptionValue('--permission');
609619
if (permission) {

‎node.gyp‎

Lines changed: 2 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -133,6 +133,7 @@
133133
'src/node_main_instance.cc',
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'src/node_messaging.cc',
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'src/node_metadata.cc',
136+
'src/node_diagnostics_channel.cc',
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'src/node_modules.cc',
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'src/node_options.cc',
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'src/node_os.cc',
@@ -270,6 +271,7 @@
270271
'src/node_messaging.h',
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'src/node_metadata.h',
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'src/node_mutex.h',
274+
'src/node_diagnostics_channel.h',
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'src/node_modules.h',
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'src/node_object_wrap.h',
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'src/node_options.h',

‎src/base_object_types.h‎

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -10,6 +10,7 @@ namespace node {
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// what the class passes to SET_BINDING_ID(), the second argument should match
1111
// the C++ class name.
1212
#define SERIALIZABLE_BINDING_TYPES(V) \
13+
V(diagnostics_channel_binding_data, diagnostics_channel::BindingData) \
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V(encoding_binding_data, encoding_binding::BindingData) \
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V(fs_binding_data, fs::BindingData) \
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V(mksnapshot_binding_data, mksnapshot::BindingData) \

‎src/node_binding.cc‎

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -48,6 +48,7 @@
4848
V(constants) \
4949
V(contextify) \
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V(credentials) \
51+
V(diagnostics_channel) \
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V(encoding_binding) \
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V(errors) \
5354
V(fs) \

‎src/node_binding.h‎

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -49,6 +49,7 @@ static_assert(static_cast<int>(NM_F_LINKED) ==
4949
V(blob) \
5050
V(builtins) \
5151
V(contextify) \
52+
V(diagnostics_channel) \
5253
V(encoding_binding) \
5354
V(fs) \
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V(fs_dir) \

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