1 files changed, 104 insertions, 0 deletions
diff --git a/node_modules/undici/lib/web/websocket/sender.js b/node_modules/undici/lib/web/websocket/sender.js
new file mode 100644
index 0000000..1b1468d
--- /dev/null
+++ b/node_modules/undici/lib/web/websocket/sender.js
@@ -0,0 +1,104 @@
+'use strict'
+
+const { WebsocketFrameSend } = require('./frame')
+const { opcodes, sendHints } = require('./constants')
+const FixedQueue = require('../../dispatcher/fixed-queue')
+
+/** @type {typeof Uint8Array} */
+const FastBuffer = Buffer[Symbol.species]
+
+/**
+ * @typedef {object} SendQueueNode
+ * @property {Promise<void> | null} promise
+ * @property {((...args: any[]) => any)} callback
+ * @property {Buffer | null} frame
+ */
+
+class SendQueue {
+  /**
+   * @type {FixedQueue}
+   */
+  #queue = new FixedQueue()
+
+  /**
+   * @type {boolean}
+   */
+  #running = false
+
+  /** @type {import('node:net').Socket} */
+  #socket
+
+  constructor (socket) {
+    this.#socket = socket
+  }
+
+  add (item, cb, hint) {
+    if (hint !== sendHints.blob) {
+      const frame = createFrame(item, hint)
+      if (!this.#running) {
+        // fast-path
+        this.#socket.write(frame, cb)
+      } else {
+        /** @type {SendQueueNode} */
+        const node = {
+          promise: null,
+          callback: cb,
+          frame
+        }
+        this.#queue.push(node)
+      }
+      return
+    }
+
+    /** @type {SendQueueNode} */
+    const node = {
+      promise: item.arrayBuffer().then((ab) => {
+        node.promise = null
+        node.frame = createFrame(ab, hint)
+      }),
+      callback: cb,
+      frame: null
+    }
+
+    this.#queue.push(node)
+
+    if (!this.#running) {
+      this.#run()
+    }
+  }
+
+  async #run () {
+    this.#running = true
+    const queue = this.#queue
+    while (!queue.isEmpty()) {
+      const node = queue.shift()
+      // wait pending promise
+      if (node.promise !== null) {
+        await node.promise
+      }
+      // write
+      this.#socket.write(node.frame, node.callback)
+      // cleanup
+      node.callback = node.frame = null
+    }
+    this.#running = false
+  }
+}
+
+function createFrame (data, hint) {
+  return new WebsocketFrameSend(toBuffer(data, hint)).createFrame(hint === sendHints.string ? opcodes.TEXT : opcodes.BINARY)
+}
+
+function toBuffer (data, hint) {
+  switch (hint) {
+    case sendHints.string:
+      return Buffer.from(data)
+    case sendHints.arrayBuffer:
+    case sendHints.blob:
+      return new FastBuffer(data)
+    case sendHints.typedArray:
+      return new FastBuffer(data.buffer, data.byteOffset, data.byteLength)
+  }
+}
+
+module.exports = { SendQueue }