Function formatWSFrame

test/common/inspector-helper.js:92–120

(message)

}

function formatWSFrame(message) {
  const messageBuf = Buffer.from(JSON.stringify(message));

  const wsHeaderBuf = Buffer.allocUnsafe(16);
  wsHeaderBuf.writeUInt8(0x81, 0);
  let byte2 = 0x80;
  const bodyLen = messageBuf.length;

  let maskOffset = 2;
  if (bodyLen < 126) {
    byte2 = 0x80 + bodyLen;
  } else if (bodyLen < 65536) {
    byte2 = 0xFE;
    wsHeaderBuf.writeUInt16BE(bodyLen, 2);
    maskOffset = 4;
  } else {
    byte2 = 0xFF;
    wsHeaderBuf.writeUInt32BE(bodyLen, 2);
    wsHeaderBuf.writeUInt32BE(0, 6);
    maskOffset = 10;
  }
  wsHeaderBuf.writeUInt8(byte2, 1);
  wsHeaderBuf.writeUInt32BE(0x01020408, maskOffset);

  for (let i = 0; i < messageBuf.length; i++)
    messageBuf[i] = messageBuf[i] ^ (1 << (i % 4));

  return Buffer.concat([wsHeaderBuf.slice(0, maskOffset + 4), messageBuf]);
}

class InspectorSession {
  constructor(socket, instance) {