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Protocol.js
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Protocol.js
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var Parser = require('./Parser');
var Sequences = require('./sequences');
var Packets = require('./packets');
var Auth = require('./Auth');
var Stream = require('stream').Stream;
var Util = require('util');
module.exports = Protocol;
Util.inherits(Protocol, Stream);
function Protocol(options) {
Stream.call(this);
options = options || {};
this.readable = true;
this.writable = true;
this._parser = new Parser({packetParser: this._parsePacket.bind(this)});
this._config = null;
this._callback = null;
this._queue = [];
}
Protocol.prototype.write = function(buffer) {
// @TODO Try..catch and handle errors
this._parser.write(buffer);
return true;
};
Protocol.prototype.handshake = function(config, cb) {
this._enqueue(new Sequences.Handshake(config, cb));
};
Protocol.prototype.query = function(options, cb) {
this._enqueue(new Sequences.Query(options, cb));
};
Protocol.prototype.end = function(cb) {
this._enqueue(new Sequences.End(cb));
};
Protocol.prototype._enqueue = function(sequence) {
this._queue.push(sequence);
if (this._queue.length === 1) {
this._executeSequence(sequence);
}
};
Protocol.prototype._parsePacket = function(header) {
try {
var sequence = this._queue[0];
var Packet = this._determinePacket(sequence);
var packet = new Packet();
sequence.trackAndVerifyPacketNumber(header.number);
// Special case: Faster dispatch, and parsing done inside sequence
if (Packet === Packets.RowDataPacket) {
sequence.RowDataPacket(packet, this._parser);
return;
}
packet.parse(this._parser);
sequence[Packet.name](packet);
} catch (err) {
err.code = 'PARSE_ERROR';
this.fatalError(err);
}
};
Protocol.prototype._determinePacket = function(sequence) {
var firstByte = this._parser.peak();
if (sequence.determinePacket) {
var Packet = sequence.determinePacket(firstByte);
if (Packet) {
return Packet;
}
}
switch (firstByte) {
case 0x00: return Packets.OkPacket;
case 0xfe: return Packets.EofPacket;
case 0xff: return Packets.ErrorPacket;
}
};
Protocol.prototype._executeSequence = function(sequence) {
var self = this;
sequence
.on('error', function(err) {
self._handleSequenceError(sequence, err);
})
.on('data', function(buffer) {
self.emit('data', buffer);
})
.on('end', function() {
self._dequeue();
});
sequence.start();
};
Protocol.prototype._dequeue = function() {
this._queue.shift();
var sequence = this._queue[0];
if (sequence) {
this._executeSequence(sequence);
}
};
Protocol.prototype._handleSequenceError = function(sequence, err) {
var bubbleUp = (sequence.hasCallback())
? false
: err.fatal && !this._hasPendingCallbacks();
if (bubbleUp) {
this.emit('error', err);
}
if (err.fatal) {
this.fatalError(err);
}
};
Protocol.prototype._hasPendingCallbacks = function() {
return this._queue.some(function(sequence) {
return sequence.hasCallback();
});
};
Protocol.prototype.fatalError = function(err) {
err.fatal = true;
var pendingSequences = this._queue;
this._queue = [];
pendingSequences.forEach(function(sequence) {
sequence.invokeCallback(err);
});
};
Protocol.prototype.destroy = function(err) {
};