feat: add message byte batching

package.json

@@ -174,6 +174,7 @@
     "@libp2p/interface": "^0.1.0",
     "@libp2p/logger": "^3.0.0",
     "abortable-iterator": "^5.0.1",
+    "it-batched-bytes": "^2.0.3",
     "it-foreach": "^2.0.3",
     "it-pipe": "^3.0.1",
     "it-pushable": "^3.2.0",

src/config.ts

@@ -52,6 +52,18 @@ export interface Config {
    * This ensures that a single stream doesn't hog a connection.
    */
   maxMessageSize: number
+
+  /**
+   * Each byte array written into a multiplexed stream is converted to one or
+   * more messages which are sent as byte arrays to the remote node. Sending
+   * lots of small messages can be expensive - use this setting to batch up
+   * the serialized bytes of all messages sent during the current tick up to
+   * this limit to send in one go similar to Nagle's algorithm. N.b. you
+   * should benchmark your application carefully when using this setting as it
+   * may cause the opposite of the desired effect. Omit this setting to send
+   * all messages as they become available. (default: 1)
+   */
+  minSendBytes: number
 }
 
 export const defaultConfig: Config = {
@@ -62,7 +74,8 @@ export const defaultConfig: Config = {
   maxOutboundStreams: 1_000,
   initialStreamWindowSize: INITIAL_STREAM_WINDOW,
   maxStreamWindowSize: MAX_STREAM_WINDOW,
-  maxMessageSize: 64 * 1024
+  maxMessageSize: 64 * 1024,
+  minSendBytes: 1
 }
 
 export function verifyConfig (config: Config): void {
@@ -87,4 +100,7 @@ export function verifyConfig (config: Config): void {
   if (config.maxMessageSize < 1024) {
     throw new CodeError('MaxMessageSize must be greater than a kilobyte', ERR_INVALID_CONFIG)
   }
+  if (config.minSendBytes <= 0) {
+    throw new CodeError('MinSendBytes must be greater than 0', ERR_INVALID_CONFIG)
+  }
 }

src/muxer.ts

@@ -1,8 +1,9 @@
 import { CodeError } from '@libp2p/interface/errors'
 import { logger, type Logger } from '@libp2p/logger'
 import { abortableSource } from 'abortable-iterator'
+import batchedBytes from 'it-batched-bytes'
 import { pipe } from 'it-pipe'
-import { pushable, type Pushable } from 'it-pushable'
+import { pushableV, type PushableV } from 'it-pushable'
 import { type Config, defaultConfig, verifyConfig } from './config.js'
 import { ERR_BOTH_CLIENTS, ERR_INVALID_FRAME, ERR_MAX_OUTBOUND_STREAMS_EXCEEDED, ERR_MUXER_LOCAL_CLOSED, ERR_MUXER_REMOTE_CLOSED, ERR_NOT_MATCHING_PING, ERR_STREAM_ALREADY_EXISTS, ERR_UNREQUESTED_PING, PROTOCOL_ERRORS } from './constants.js'
 import { Decoder } from './decode.js'
@@ -43,12 +44,13 @@ export interface CloseOptions extends AbortOptions {
 
 export class YamuxMuxer implements StreamMuxer {
   protocol = YAMUX_PROTOCOL_ID
-  source: Pushable<Uint8Array>
+  source: AsyncGenerator<Uint8Array>
   sink: Sink<Source<Uint8ArrayList | Uint8Array>, Promise<void>>
 
   private readonly config: Config
   private readonly log?: Logger
 
+  private readonly _source: PushableV<Uint8Array>
   /** Used to close the muxer from either the sink or source */
   private readonly closeController: AbortController
 
@@ -80,7 +82,7 @@ export class YamuxMuxer implements StreamMuxer {
 
   constructor (init: YamuxMuxerInit) {
     this.client = init.direction === 'outbound'
-    this.config = { ...defaultConfig, ...init }
+    const config = this.config = { ...defaultConfig, ...init }
     this.log = this.config.log
     verifyConfig(this.config)
 
@@ -91,7 +93,7 @@ export class YamuxMuxer implements StreamMuxer {
 
     this._streams = new Map()
 
-    this.source = pushable({
+    this._source = pushableV({
       onEnd: (): void => {
         this.log?.trace('muxer source ended')
 
@@ -100,6 +102,16 @@ export class YamuxMuxer implements StreamMuxer {
         })
       }
     })
+    this.source = pipe(
+      this._source,
+      async function * (source) {
+        yield * batchedBytes(source, {
+          size: config.minSendBytes,
+          serialize: (bufs, list) => { list.appendAll(bufs) }
+
+        })
+      }
+    )
 
     this.sink = async (source: Source<Uint8ArrayList | Uint8Array>): Promise<void> => {
       source = abortableSource(
@@ -322,7 +334,7 @@ export class YamuxMuxer implements StreamMuxer {
     this.closeController.abort()
 
     // stop the source
-    this.source.end()
+    this._source.end()
   }
 
   /** Create a new stream */
@@ -538,10 +550,10 @@ export class YamuxMuxer implements StreamMuxer {
       if (data === undefined) {
         throw new CodeError('invalid frame', ERR_INVALID_FRAME)
       }
-      this.source.push(encodeHeader(header))
-      this.source.push(data)
+      this._source.push(encodeHeader(header))
+      this._source.push(data)
     } else {
-      this.source.push(encodeHeader(header))
+      this._source.push(encodeHeader(header))
     }
   }