node-pg-copy-streams/message-formats.js

/**
 * The COPY feature uses the following protocol codes.
 * The codes for the most recent protocol version are documented on
 * https://www.postgresql.org/docs/current/static/protocol-message-formats.html
 * 
 * The protocol flow itself is described on
 * https://www.postgresql.org/docs/current/static/protocol-flow.html
 */
module.exports = {
  ErrorResponse:        0x45, // E
  CopyInResponse:       0x47, // G
  CopyOutResponse:      0x48, // H
  CopyBothResponse:     0x57, // W
  CopyDone:             0x63, // c
  CopyData:             0x64, // d
  CopyFail:             0x66, // f

  // It is possible for NoticeResponse and ParameterStatus messages to be interspersed between CopyData messages;
  // frontends must handle these cases, and should be prepared for other asynchronous message types as well
  // (see Section 50.2.6).
  // Otherwise, any message type other than CopyData or CopyDone may be treated as terminating copy-out mode.
  NotificationResponse: 0x41, // A
  NoticeResponse:       0x4E, // N
  ParameterStatus:      0x53  // S
}