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'use strict';
const EventEmitter = require('events').EventEmitter;
const Timers = require('timers');
class Command extends EventEmitter {
constructor() {
super();
this.next = null;
}
// slow. debug only
stateName() {
const state = this.next;
for (const i in this) {
if (this[i] === state && i !== 'next') {
return i;
}
}
return 'unknown name';
}
execute(packet, connection) {
if (!this.next) {
this.next = this.start;
connection._resetSequenceId();
}
if (packet && packet.isError()) {
const err = packet.asError(connection.clientEncoding);
err.sql = this.sql || this.query;
if (this.queryTimeout) {
Timers.clearTimeout(this.queryTimeout);
this.queryTimeout = null;
}
if (this.onResult) {
this.onResult(err);
this.emit('end');
} else {
this.emit('error', err);
this.emit('end');
}
return true;
}
// TODO: don't return anything from execute, it's ugly and error-prone. Listen for 'end' event in connection
this.next = this.next(packet, connection);
if (this.next) {
return false;
}
this.emit('end');
return true;
}
}
module.exports = Command;