node-eventstore-client/src/systemData/tcpCommand.js

const TcpCommand = Object.freeze({
  HeartbeatRequestCommand: 0x01,
  HeartbeatResponseCommand: 0x02,

  Ping: 0x03,
  Pong: 0x04,

  PrepareAck: 0x05,
  CommitAck: 0x06,

  SlaveAssignment: 0x07,
  CloneAssignment: 0x08,

  SubscribeReplica: 0x10,
  ReplicaLogPositionAck: 0x11,
  CreateChunk: 0x12,
  RawChunkBulk: 0x13,
  DataChunkBulk: 0x14,
  ReplicaSubscriptionRetry: 0x15,
  ReplicaSubscribed: 0x16,

  // CLIENT COMMANDS
  //        CreateStream: 0x80,
  //        CreateStreamCompleted: 0x81,

  WriteEvents: 0x82,
  WriteEventsCompleted: 0x83,

  TransactionStart: 0x84,
  TransactionStartCompleted: 0x85,
  TransactionWrite: 0x86,
  TransactionWriteCompleted: 0x87,
  TransactionCommit: 0x88,
  TransactionCommitCompleted: 0x89,

  DeleteStream: 0x8A,
  DeleteStreamCompleted: 0x8B,

  ReadEvent: 0xB0,
  ReadEventCompleted: 0xB1,
  ReadStreamEventsForward: 0xB2,
  ReadStreamEventsForwardCompleted: 0xB3,
  ReadStreamEventsBackward: 0xB4,
  ReadStreamEventsBackwardCompleted: 0xB5,
  ReadAllEventsForward: 0xB6,
  ReadAllEventsForwardCompleted: 0xB7,
  ReadAllEventsBackward: 0xB8,
  ReadAllEventsBackwardCompleted: 0xB9,

  SubscribeToStream: 0xC0,
  SubscriptionConfirmation: 0xC1,
  StreamEventAppeared: 0xC2,
  UnsubscribeFromStream: 0xC3,
  SubscriptionDropped: 0xC4,
  ConnectToPersistentSubscription: 0xC5,
  PersistentSubscriptionConfirmation: 0xC6,
  PersistentSubscriptionStreamEventAppeared: 0xC7,
  CreatePersistentSubscription: 0xC8,
  CreatePersistentSubscriptionCompleted: 0xC9,
  DeletePersistentSubscription: 0xCA,
  DeletePersistentSubscriptionCompleted: 0xCB,
  PersistentSubscriptionAckEvents: 0xCC,
  PersistentSubscriptionNakEvents: 0xCD,
  UpdatePersistentSubscription: 0xCE,
  UpdatePersistentSubscriptionCompleted: 0xCF,

  ScavengeDatabase: 0xD0,
  ScavengeDatabaseCompleted: 0xD1,

  BadRequest: 0xF0,
  NotHandled: 0xF1,
  Authenticate: 0xF2,
  Authenticated: 0xF3,
  NotAuthenticated: 0xF4,
  IdentifyClient: 0xF5,
  ClientIdentified: 0xF6,

  getName: function(v) {
    return _reverseLookup[v];
  }
});

var _reverseLookup = {};
for(var n in TcpCommand) {
  if (n === 'getName') continue;
  var v = TcpCommand[n];
  _reverseLookup[v] = n;
}

module.exports = TcpCommand;