http2: remove support for priority signaling

Signed-off-by: Matteo Collina <hello@matteocollina.com>
Co-authored-by: Antoine du Hamel <duhamelantoine1995@gmail.com>
Refs: https://datatracker.ietf.org/doc/html/rfc9113#section-5.3.1

Author: mcollina

doc/api/deprecations.md

@@ -3945,15 +3945,17 @@ an internal nodejs implementation rather than a public facing API, use `node:str
 
 <!-- YAML
 changes:
+  - version: REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/58293
+    description: End-of-Life.
   - version: REPLACEME
     pr-url: https://github.com/nodejs/node/pull/58313
     description: Documentation-only deprecation.
 -->
 
-Type: Documentation-only
+Type: End-of-Life
 
-The support for priority signaling has been deprecated in the [RFC 9113][], and
-will be removed in future versions of Node.js.
+The support for priority signaling has been removed following its deprecation in the [RFC 9113][].
 
 [DEP0142]: #dep0142-repl_builtinlibs
 [NIST SP 800-38D]: https://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication800-38d.pdf

doc/api/http2.md

@@ -1072,6 +1072,10 @@ The `'origin'` event is only emitted when using a secure TLS connection.
 <!-- YAML
 added: v8.4.0
 changes:
+  - version: REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/58293
+    description: The `weight` option is now ignored, setting it will trigger a
+                 runtime warning.
   - version: REPLACEME
     pr-url: https://github.com/nodejs/node/pull/58313
     description: Following the deprecation of priority signaling as of RFC 1993,
@@ -1090,10 +1094,6 @@ changes:
     **Default:** `false`.
   * `parent` {number} Specifies the numeric identifier of a stream the newly
     created stream is dependent on.
-  * `weight` {number} Specifies the relative dependency of a stream in relation
-    to other streams with the same `parent`. The value is a number between `1`
-    and `256` (inclusive). This has been **deprecated** in [RFC 9113][], and
-    support for it will be removed in future versions of Node.js.
   * `waitForTrailers` {boolean} When `true`, the `Http2Stream` will emit the
     `'wantTrailers'` event after the final `DATA` frame has been sent.
   * `signal` {AbortSignal} An AbortSignal that may be used to abort an ongoing
@@ -1464,25 +1464,17 @@ numeric stream identifier.
 <!-- YAML
 added: v8.4.0
 deprecated: REPLACEME
+changes:
+  - version: REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/58293
+    description: This method no longer sets the priority of the stream. Using it
+                 now triggers a runtime warning.
 -->
 
 > Stability: 0 - Deprecated: support for priority signaling has been deprecated
 > in the [RFC 9113][] and is no longer supported in Node.js.
 
-* `options` {Object}
-  * `exclusive` {boolean} When `true` and `parent` identifies a parent Stream,
-    this stream is made the sole direct dependency of the parent, with
-    all other existing dependents made a dependent of this stream. **Default:**
-    `false`.
-  * `parent` {number} Specifies the numeric identifier of a stream this stream
-    is dependent on.
-  * `weight` {number} Specifies the relative dependency of a stream in relation
-    to other streams with the same `parent`. The value is a number between `1`
-    and `256` (inclusive).
-  * `silent` {boolean} When `true`, changes the priority locally without
-    sending a `PRIORITY` frame to the connected peer.
-
-Updates the priority for this `Http2Stream` instance.
+Empty method, only there to maintain some backward compatibility.
 
 #### `http2stream.rstCode`
 
@@ -1579,6 +1571,10 @@ req.setTimeout(5000, () => req.close(NGHTTP2_CANCEL));
 <!-- YAML
 added: v8.4.0
 changes:
+  - version: REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/58293
+    description: The `state.weight` property is now always set to 16 and
+                 `sumDependencyWeight` is always set to 0.
   - version: REPLACEME
     pr-url: https://github.com/nodejs/node/pull/58313
     description: Following the deprecation of priority signaling as of RFC 1993,
@@ -1596,13 +1592,8 @@ Provides miscellaneous information about the current state of the
   * `localClose` {number} `1` if this `Http2Stream` has been closed locally.
   * `remoteClose` {number} `1` if this `Http2Stream` has been closed
     remotely.
-  * `sumDependencyWeight` {number} The sum weight of all `Http2Stream`
-    instances that depend on this `Http2Stream` as specified using
-    `PRIORITY` frames. This has been **deprecated** in [RFC 9113][], and
-    support for it will be removed in future versions of Node.js.
-  * `weight` {number} The priority weight of this `Http2Stream`. This has been
-    **deprecated** in [RFC 9113][], and support for it will be removed in future
-    versions of Node.js.
+  * `sumDependencyWeight` {number} Legacy property, always set to `0`.
+  * `weight` {number} Legacy property, always set to `16`.
 
 A current state of this `Http2Stream`.
 

lib/internal/http2/core.js

@@ -30,6 +30,8 @@ const {
   customInspectSymbol: kInspect,
   kEmptyObject,
   promisify,
+  deprecate,
+  deprecateProperty,
 } = require('internal/util');
 
 assertCrypto();
@@ -746,6 +748,11 @@ function onGoawayData(code, lastStreamID, buf) {
   }
 }
 
+// TODO(aduh95): remove this in future semver-major
+const deprecateWeight = deprecateProperty('weight',
+                                          'Priority signaling has been deprecated as of RFC 1993.',
+                                          'DEP0194');
+
 // When a ClientHttp2Session is first created, the socket may not yet be
 // connected. If request() is called during this time, the actual request
 // will be deferred until the socket is ready to go.
@@ -774,12 +781,14 @@ function requestOnConnect(headersList, headersParam, options) {
   if (options.waitForTrailers)
     streamOptions |= STREAM_OPTION_GET_TRAILERS;
 
+  deprecateWeight(options);
+
   // `ret` will be either the reserved stream ID (if positive)
   // or an error code (if negative)
   const ret = session[kHandle].request(headersList,
                                        streamOptions,
                                        options.parent | 0,
-                                       options.weight | 0,
+                                       NGHTTP2_DEFAULT_WEIGHT,
                                        !!options.exclusive);
 
   // In an error condition, one of three possible response codes will be
@@ -824,11 +833,7 @@ function requestOnConnect(headersList, headersParam, options) {
 //
 // Also sets the default priority options if they are not set.
 const setAndValidatePriorityOptions = hideStackFrames((options) => {
-  if (options.weight === undefined) {
-    options.weight = NGHTTP2_DEFAULT_WEIGHT;
-  } else {
-    validateNumber.withoutStackTrace(options.weight, 'options.weight');
-  }
+  deprecateWeight(options);
 
   if (options.parent === undefined) {
     options.parent = 0;
@@ -884,25 +889,6 @@ function submitSettings(settings, callback) {
   }
 }
 
-// Submits a PRIORITY frame to be sent to the remote peer
-// Note: If the silent option is true, the change will be made
-// locally with no PRIORITY frame sent.
-function submitPriority(options) {
-  if (this.destroyed)
-    return;
-  this[kUpdateTimer]();
-
-  // If the parent is the id, do nothing because a
-  // stream cannot be made to depend on itself.
-  if (options.parent === this[kID])
-    return;
-
-  this[kHandle].priority(options.parent | 0,
-                         options.weight | 0,
-                         !!options.exclusive,
-                         !!options.silent);
-}
-
 // Submit a GOAWAY frame to be sent to the remote peer.
 // If the lastStreamID is set to <= 0, then the lastProcStreamID will
 // be used. The opaqueData must either be a typed array or undefined
@@ -2312,25 +2298,6 @@ class Http2Stream extends Duplex {
     }
   }
 
-  priority(options) {
-    if (this.destroyed)
-      throw new ERR_HTTP2_INVALID_STREAM();
-
-    assertIsObject(options, 'options');
-    options = { ...options };
-    setAndValidatePriorityOptions(options);
-
-    const priorityFn = submitPriority.bind(this, options);
-
-    // If the handle has not yet been assigned, queue up the priority
-    // frame to be sent as soon as the ready event is emitted.
-    if (this.pending) {
-      this.once('ready', priorityFn);
-      return;
-    }
-    priorityFn();
-  }
-
   sendTrailers(headers) {
     if (this.destroyed || this.closed)
       throw new ERR_HTTP2_INVALID_STREAM();
@@ -2496,6 +2463,12 @@ class Http2Stream extends Duplex {
   }
 }
 
+// TODO(aduh95): remove this in future semver-major
+Http2Stream.prototype.priority = deprecate(function priority(options) {
+  if (this.destroyed)
+    throw new ERR_HTTP2_INVALID_STREAM();
+}, 'http2Stream.priority is longer supported after priority signalling was deprecated in RFC 1993', 'DEP0194');
+
 function callTimeout(self, session) {
   // If the session is destroyed, this should never actually be invoked,
   // but just in case...

lib/internal/util.js

@@ -135,6 +135,17 @@ function isPendingDeprecation() {
     !getOptionValue('--no-deprecation');
 }
 
+function deprecateProperty(key, msg, code, isPendingDeprecation) {
+  const emitDeprecationWarning = getDeprecationWarningEmitter(
+    code, msg, undefined, false, isPendingDeprecation,
+  );
+  return (options) => {
+    if (key in options) {
+      emitDeprecationWarning();
+    }
+  };
+}
+
 // Internal deprecator for pending --pending-deprecation. This can be invoked
 // at snapshot building time as the warning permission is only queried at
 // run time.
@@ -947,6 +958,7 @@ module.exports = {
   defineReplaceableLazyAttribute,
   deprecate,
   deprecateInstantiation,
+  deprecateProperty,
   emitExperimentalWarning,
   encodingsMap,
   exposeInterface,

test/parallel/test-http2-client-priority-before-connect.js

@@ -5,6 +5,11 @@ if (!common.hasCrypto)
   common.skip('missing crypto');
 const h2 = require('http2');
 
+common.expectWarning(
+  'DeprecationWarning',
+  'http2Stream.priority is longer supported after priority signalling was deprecated in RFC 1993',
+  'DEP0194');
+
 const server = h2.createServer();
 
 // We use the lower-level API here

test/parallel/test-http2-client-request-options-errors.js

@@ -11,7 +11,6 @@ const http2 = require('http2');
 
 const optionsToTest = {
   endStream: 'boolean',
-  weight: 'number',
   parent: 'number',
   exclusive: 'boolean',
   silent: 'boolean'

test/parallel/test-http2-client-set-priority.js

@@ -6,10 +6,16 @@ if (!common.hasCrypto)
 const assert = require('assert');
 const http2 = require('http2');
 
+common.expectWarning(
+  'DeprecationWarning',
+  'Priority signaling has been deprecated as of RFC 1993.',
+  'DEP0194');
+
 const checkWeight = (actual, expect) => {
   const server = http2.createServer();
   server.on('stream', common.mustCall((stream, headers, flags) => {
-    assert.strictEqual(stream.state.weight, expect);
+    assert.strictEqual(stream.state.sumDependencyWeight, 0);
+    assert.strictEqual(stream.state.weight, 16);
     stream.respond();
     stream.end('test');
   }));

test/parallel/test-http2-priority-cycle-.js

@@ -7,6 +7,11 @@ const assert = require('assert');
 const http2 = require('http2');
 const Countdown = require('../common/countdown');
 
+common.expectWarning(
+  'DeprecationWarning',
+  'http2Stream.priority is longer supported after priority signalling was deprecated in RFC 1993',
+  'DEP0194');
+
 const server = http2.createServer();
 const largeBuffer = Buffer.alloc(1e4);
 

test/parallel/test-http2-priority-event.js

@@ -3,21 +3,18 @@
 const common = require('../common');
 if (!common.hasCrypto)
   common.skip('missing crypto');
-const assert = require('assert');
 const h2 = require('http2');
 
+common.expectWarning(
+  'DeprecationWarning',
+  'http2Stream.priority is longer supported after priority signalling was deprecated in RFC 1993',
+  'DEP0194');
+
 const server = h2.createServer();
 
 // We use the lower-level API here
 server.on('stream', common.mustCall(onStream));
 
-function onPriority(stream, parent, weight, exclusive) {
-  assert.strictEqual(stream, 1);
-  assert.strictEqual(parent, 0);
-  assert.strictEqual(weight, 1);
-  assert.strictEqual(exclusive, false);
-}
-
 function onStream(stream, headers, flags) {
   stream.priority({
     parent: 0,
@@ -33,7 +30,7 @@ function onStream(stream, headers, flags) {
 
 server.listen(0);
 
-server.on('priority', common.mustCall(onPriority));
+server.on('priority', common.mustNotCall());
 
 server.on('listening', common.mustCall(() => {
 
@@ -48,7 +45,9 @@ server.on('listening', common.mustCall(() => {
     });
   });
 
-  req.on('priority', common.mustCall(onPriority));
+  // The priority event is not supported anymore by nghttp2
+  // since 1.65.0.
+  req.on('priority', common.mustNotCall());
 
   req.on('response', common.mustCall());
   req.resume();

test/parallel/test-http2-server-stream-session-destroy.js

@@ -6,6 +6,11 @@ if (!common.hasCrypto)
 const assert = require('assert');
 const h2 = require('http2');
 
+common.expectWarning(
+  'DeprecationWarning',
+  'http2Stream.priority is longer supported after priority signalling was deprecated in RFC 1993',
+  'DEP0194');
+
 const server = h2.createServer();
 
 server.on('stream', common.mustCall((stream) => {