476 lines
11 KiB
JavaScript
476 lines
11 KiB
JavaScript
var net = require('net');
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var crypto = require('crypto');
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var EventEmitter = require('events').EventEmitter;
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var util = require('util');
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var utils = require(__dirname + '/utils');
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var Writer = require(__dirname + '/writer');
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var Connection = function(config) {
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EventEmitter.call(this);
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config = config || {};
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this.stream = config.stream || new net.Stream();
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this.lastBuffer = false;
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this.lastOffset = 0;
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this.buffer = null;
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this.offset = null;
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this.encoding = 'utf8';
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this.parsedStatements = {};
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this.writer = new Writer();
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};
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util.inherits(Connection, EventEmitter);
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var p = Connection.prototype;
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p.connect = function(port, host) {
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if(this.stream.readyState === 'closed'){
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this.stream.connect(port, host);
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}
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else if(this.stream.readyState == 'open') {
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this.emit('connect');
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}
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var self = this;
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this.stream.on('connect', function() {
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self.emit('connect');
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});
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this.stream.on('data', function(buffer) {
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self.setBuffer(buffer);
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var msg;
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while(msg = self.parseMessage()) {
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self.emit('message', msg);
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self.emit(msg.name, msg);
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}
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});
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this.stream.on('error', function(error) {
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self.emit('error', error);
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});
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};
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p.startup = function(config) {
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var bodyBuffer = this.writer
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.addInt16(3)
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.addInt16(0)
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.addCString('user')
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.addCString(config.user)
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.addCString('database')
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.addCString(config.database)
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.addCString('').flush();
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//this message is sent without a code
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var length = bodyBuffer.length + 4;
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var buffer = new Writer()
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.addInt32(length)
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.add(bodyBuffer)
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.join();
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this.stream.write(buffer);
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};
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p.cancel = function(processID, secretKey) {
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var bodyBuffer = this.writer
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.addInt16(1234)
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.addInt16(5678)
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.addInt32(processID)
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.addInt32(secretKey)
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.addCString('').flush();
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var length = bodyBuffer.length + 4;
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var buffer = new Writer()
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.addInt32(length)
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.add(bodyBuffer)
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.join();
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this.stream.write(buffer);
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};
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p.password = function(password) {
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//0x70 = 'p'
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this._send(0x70, this.writer.addCString(password));
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};
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p._send = function(code, more) {
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if(more === true) {
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this.writer.addHeader(code);
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} else {
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return this.stream.write(this.writer.flush(code));
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}
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}
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p.query = function(text) {
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//0x51 = Q
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this.stream.write(this.writer.addCString(text).flush(0x51));
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};
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//send parse message
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//"more" === true to buffer the message until flush() is called
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p.parse = function(query, more) {
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//expect something like this:
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// { name: 'queryName',
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// text: 'select * from blah',
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// types: ['int8', 'bool'] }
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//normalize missing query names to allow for null
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query.name = query.name || '';
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//normalize null type array
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query.types = query.types || [];
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var len = query.types.length;
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var buffer = this.writer
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.addCString(query.name) //name of query
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.addCString(query.text) //actual query text
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.addInt16(len);
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for(var i = 0; i < len; i++) {
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buffer.addInt32(query.types[i]);
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}
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var code = 0x50;
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this._send(code, more);
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};
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//send bind message
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//"more" === true to buffer the message until flush() is called
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p.bind = function(config, more) {
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//normalize config
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config = config || {};
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config.portal = config.portal || '';
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config.statement = config.statement || '';
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var values = config.values || [];
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var len = values.length;
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var buffer = this.writer
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.addCString(config.portal)
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.addCString(config.statement)
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.addInt16(0) //always use default text format
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.addInt16(len); //number of parameters
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for(var i = 0; i < len; i++) {
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var val = values[i];
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if(val === null || typeof val === "undefined") {
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buffer.addInt32(-1);
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} else {
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val = val.toString();
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buffer.addInt32(Buffer.byteLength(val));
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buffer.addString(val);
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}
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}
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buffer.addInt16(0); //no format codes, use text
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//0x42 = 'B'
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this._send(0x42, more);
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};
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//send execute message
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//"more" === true to buffer the message until flush() is called
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p.execute = function(config, more) {
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config = config || {};
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config.portal = config.portal || '';
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config.rows = config.rows || '';
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var buffer = this.writer
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.addCString(config.portal)
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.addInt32(config.rows);
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//0x45 = 'E'
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this._send(0x45, more);
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};
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var emptyBuffer = Buffer(0);
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p.flush = function() {
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//0x48 = 'H'
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this.writer.add(emptyBuffer)
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this._send(0x48);
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}
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p.sync = function() {
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//clear out any pending data in the writer
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this.writer.flush(0)
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this.writer.add(emptyBuffer);
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this._send(0x53);
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};
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p.end = function() {
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//0x58 = 'X'
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this.writer.add(emptyBuffer);
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this._send(0x58);
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};
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p.describe = function(msg, more) {
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this.writer.addCString(msg.type + (msg.name || ''));
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this._send(0x44, more);
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};
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//parsing methods
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p.setBuffer = function(buffer) {
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if(this.lastBuffer) { //we have unfinished biznaz
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//need to combine last two buffers
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var remaining = this.lastBuffer.length - this.lastOffset;
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var combinedBuffer = new Buffer(buffer.length + remaining);
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this.lastBuffer.copy(combinedBuffer, 0, this.lastOffset);
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buffer.copy(combinedBuffer, remaining, 0);
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buffer = combinedBuffer;
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}
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this.buffer = buffer;
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this.offset = 0;
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};
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p.parseMessage = function() {
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var remaining = this.buffer.length - (this.offset);
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if(remaining < 5) {
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//cannot read id + length without at least 5 bytes
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//just abort the read now
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this.lastBuffer = this.buffer;
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this.lastOffset = this.offset;
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return false;
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}
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//read message id code
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var id = this.buffer[this.offset++];
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//read message length
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var length = this.parseInt32();
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if(remaining <= length) {
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this.lastBuffer = this.buffer;
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//rewind the last 5 bytes we read
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this.lastOffset = this.offset-5;
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return false;
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}
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var msg = {
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length: length
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};
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switch(id)
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{
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case 0x52: //R
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msg.name = 'authenticationOk';
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return this.parseR(msg);
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case 0x53: //S
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msg.name = 'parameterStatus';
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return this.parseS(msg);
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case 0x4b: //K
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msg.name = 'backendKeyData';
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return this.parseK(msg);
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case 0x43: //C
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msg.name = 'commandComplete';
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return this.parseC(msg);
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case 0x5a: //Z
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msg.name = 'readyForQuery';
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return this.parseZ(msg);
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case 0x54: //T
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msg.name = 'rowDescription';
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return this.parseT(msg);
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case 0x44: //D
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msg.name = 'dataRow';
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return this.parseD(msg);
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case 0x45: //E
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msg.name = 'error';
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return this.parseE(msg);
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case 0x4e: //N
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msg.name = 'notice';
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return this.parseN(msg);
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case 0x31: //1
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msg.name = 'parseComplete';
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return msg;
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case 0x32: //2
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msg.name = 'bindComplete';
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return msg;
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case 0x41: //A
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msg.name = 'notification';
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return this.parseA(msg);
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case 0x6e: //n
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msg.name = 'noData';
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return msg;
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case 0x49: //I
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msg.name = 'emptyQuery';
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return msg;
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case 0x73: //s
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msg.name = 'portalSuspended';
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return msg;
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default:
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throw new Error("Unrecognized message code " + id);
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}
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};
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p.parseR = function(msg) {
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var code = 0;
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if(msg.length === 8) {
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code = this.parseInt32();
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if(code === 3) {
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msg.name = 'authenticationCleartextPassword';
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}
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return msg;
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}
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if(msg.length === 12) {
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code = this.parseInt32();
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if(code === 5) { //md5 required
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msg.name = 'authenticationMD5Password';
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msg.salt = new Buffer(4);
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this.buffer.copy(msg.salt, 0, this.offset, this.offset + 4);
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this.offset += 4;
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return msg;
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}
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}
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throw new Error("Unknown authenticatinOk message type" + util.inspect(msg));
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};
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p.parseS = function(msg) {
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msg.parameterName = this.parseCString();
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msg.parameterValue = this.parseCString();
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return msg;
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};
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p.parseK = function(msg) {
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msg.processID = this.parseInt32();
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msg.secretKey = this.parseInt32();
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return msg;
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};
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p.parseC = function(msg) {
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msg.text = this.parseCString();
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return msg;
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};
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p.parseZ = function(msg) {
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msg.status = this.readChar();
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return msg;
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};
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p.parseT = function(msg) {
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msg.fieldCount = this.parseInt16();
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var fields = [];
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for(var i = 0; i < msg.fieldCount; i++){
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fields[i] = this.parseField();
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}
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msg.fields = fields;
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return msg;
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};
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p.parseField = function() {
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var field = {
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name: this.parseCString(),
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tableID: this.parseInt32(),
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columnID: this.parseInt16(),
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dataTypeID: this.parseInt32(),
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dataTypeSize: this.parseInt16(),
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dataTypeModifier: this.parseInt32(),
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format: this.parseInt16() === 0 ? 'text' : 'binary'
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};
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return field;
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};
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p.parseD = function(msg) {
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var fieldCount = this.parseInt16();
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var fields = [];
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for(var i = 0; i < fieldCount; i++) {
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var length = this.parseInt32();
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fields[i] = (length === -1 ? null : this.readString(length))
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};
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msg.fieldCount = fieldCount;
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msg.fields = fields;
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return msg;
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};
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//parses error
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p.parseE = function(input) {
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var fields = {};
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var msg, item;
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var fieldType = this.readString(1);
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while(fieldType != '\0') {
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fields[fieldType] = this.parseCString();
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fieldType = this.readString(1);
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}
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if (input.name === 'error') {
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// the msg is an Error instance
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msg = new Error(fields.M);
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for (item in input) {
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// copy input properties to the error
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if (input.hasOwnProperty(item)) {
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msg[item] = input[item];
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}
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}
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} else {
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// the msg is an object literal
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msg = input;
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msg.message = fields.M;
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}
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msg.severity = fields.S;
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msg.code = fields.C;
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msg.detail = fields.D;
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msg.hint = fields.H;
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msg.position = fields.P;
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msg.internalPosition = fields.p;
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msg.internalQuery = fields.q;
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msg.where = fields.W;
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msg.file = fields.F;
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msg.line = fields.L;
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msg.routine = fields.R;
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return msg;
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};
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//same thing, different name
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p.parseN = p.parseE;
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p.parseA = function(msg) {
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msg.processId = this.parseInt32();
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msg.channel = this.parseCString();
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msg.payload = this.parseCString();
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return msg;
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};
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p.readChar = function() {
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return Buffer([this.buffer[this.offset++]]).toString(this.encoding);
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};
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p.parseInt32 = function() {
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var value = this.peekInt32();
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this.offset += 4;
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return value;
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};
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p.peekInt32 = function(offset) {
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offset = offset || this.offset;
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var buffer = this.buffer;
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return ((buffer[offset++] << 24) +
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(buffer[offset++] << 16) +
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(buffer[offset++] << 8) +
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buffer[offset++]);
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};
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p.parseInt16 = function() {
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return ((this.buffer[this.offset++] << 8) +
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(this.buffer[this.offset++] << 0));
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};
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p.readString = function(length) {
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return this.buffer.toString(this.encoding, this.offset, (this.offset += length));
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};
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p.parseCString = function() {
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var start = this.offset;
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while(this.buffer[this.offset++]) { };
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return this.buffer.toString(this.encoding, start, this.offset - 1);
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};
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//end parsing methods
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module.exports = Connection;
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