Implement CMD_RESET_CONNECTION

Author: testn

lib/commands/command.js

@@ -20,6 +20,12 @@ class Command extends EventEmitter {
  return 'unknown name';
  }
 
+ /**
+ * 
+ * @param {*} packet 
+ * @param {*} connection 
+ * @returns 
+ */
  execute(packet, connection) {
  if (!this.next) {
  this.next = this.start;

lib/commands/index.js

@@ -11,6 +11,7 @@ const RegisterSlave = require('./register_slave.js');
 const BinlogDump = require('./binlog_dump.js');
 const ChangeUser = require('./change_user.js');
 const Quit = require('./quit.js');
+const ResetConnection = require('./reset_connection.js');
 
 module.exports = {
  ClientHandshake,
@@ -23,5 +24,6 @@ module.exports = {
  RegisterSlave,
  BinlogDump,
  ChangeUser,
- Quit
+ Quit,
+ ResetConnection
 };

lib/commands/reset_connection.js

@@ -0,0 +1,26 @@
+'use strict';
+
+const Command = require('./command');
+const Packets = require('../packets/index.js');
+
+class ResetConnection extends Command {
+ constructor(callback) {
+ super();
+ this.onResult = callback;
+ }
+
+ start(packet, connection) {
+ const req = new Packets.ResetConnection();
+ connection.writePacket(req.toPacket());
+ return ResetConnection.prototype.resetConnectionResponse;
+ }
+
+ resetConnectionResponse() {
+ if (this.onResult) {
+ process.nextTick(this.onResult.bind(this));
+ }
+ return null;
+ }
+}
+
+module.exports = ResetConnection;

lib/connection.js

@@ -707,6 +707,10 @@ class Connection extends EventEmitter {
  return this.addCommand(new Commands.Ping(cb));
  }
 
+ reset(cb) {
+ return this.addCommand(new Commands.ResetConnection(cb));
+ }
+
  _registerSlave(opts, cb) {
  return this.addCommand(new Commands.RegisterSlave(opts, cb));
  }

lib/constants/commands.js

@@ -32,5 +32,6 @@ module.exports = {
  STMT_FETCH: 0x1c,
  DAEMON: 0x1d, // deprecated
  BINLOG_DUMP_GTID: 0x1e,
+ RESET_CONNECTION: 0x1f, // introduced in 5.7.3
  UNKNOWN: 0xff // bad!
 };

lib/packets/index.js

@@ -25,6 +25,7 @@ const RegisterSlave = require('./register_slave');
 const ResultSetHeader = require('./resultset_header');
 const SSLRequest = require('./ssl_request');
 const TextRow = require('./text_row');
+const ResetConnection = require('./reset_connection');
 
 const ctorMap = {
  AuthSwitchRequest,
@@ -44,7 +45,8 @@ const ctorMap = {
  RegisterSlave,
  ResultSetHeader,
  SSLRequest,
- TextRow
+ TextRow,
+ ResetConnection
 };
 Object.entries(ctorMap).forEach(([name, ctor]) => {
  module.exports[name] = ctor;

lib/packets/reset_connection.js

@@ -0,0 +1,18 @@
+'use strict';
+
+const Packet = require('../packets/packet');
+const CommandCodes = require('../constants/commands');
+
+class ResetConnection {
+ constructor() {
+ }
+
+ toPacket() {
+ const packet = new Packet(0, Buffer.allocUnsafe(5), 0, 5);
+ packet.offset = 4;
+ packet.writeInt8(CommandCodes.RESET_CONNECTION);
+ return packet;
+ }
+}
+
+module.exports = ResetConnection;

promise.js

@@ -166,6 +166,15 @@ class PromiseConnection extends EventEmitter {
  });
  }
 
+ reset() {
+ const c = this.connection;
+ const localErr = new Error();
+ return new this.Promise((resolve, reject) => {
+ const done = makeDoneCb(resolve, reject, localErr);
+ c.reset(done);
+ });
+ }
+
  connect() {
  const c = this.connection;
  const localErr = new Error();