95 lines
2.5 KiB
JavaScript
95 lines
2.5 KiB
JavaScript
var EventEmitter = require('events').EventEmitter;
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var net = require('net');
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var Query = require(__dirname+'/query');
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var Parser = require(__dirname+'/parser');
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var Client = function(config) {
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EventEmitter.call(this);
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config = config || {};
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this.user = config.user;
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this.database = config.database;
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this.port = config.port || 5432;
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this.host = config.host;
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this.queryQueue = [];
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this.stream = config.stream || new net.Stream();
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this.queryQueue = [];
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};
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sys.inherits(Client, EventEmitter);
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Client.prototype.connect = function() {
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if(this.stream.readyState == 'closed'){
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this.stream.connect(this.port, this.host);
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}
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var self = this;
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this.stream.on('connect', function() {
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var data = ['user',self.user,'database', self.database, '\0'].join('\0');
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var dataBuffer = Buffer(data);
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var fullBuffer = Buffer(8 + dataBuffer.length);
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fullBuffer[0] = fullBuffer.length >>> 24;
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fullBuffer[1] = fullBuffer.length >>> 16;
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fullBuffer[2] = fullBuffer.length >>> 8;
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fullBuffer[3] = fullBuffer.length >>> 0;
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fullBuffer[4] = 0;
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fullBuffer[5] = 3;
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fullBuffer[6] = 0;
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fullBuffer[7] = 0;
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fullBuffer.write(data,8);
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self.stream.write(fullBuffer);
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});
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this.stream.on('data', function(data) {
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var parser = new Parser(data);
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var msg = parser.parseMessage();
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while(msg) {
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self.emit('message', msg);
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self.emit(msg.name, msg);
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msg = parser.parseMessage();
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}
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});
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this.on('ReadyForQuery', function() {
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self.readyForQuery = true;
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self.pulseQueryQueue();
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});
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};
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Client.prototype.disconnect = function() {
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var terminationBuffer = new Buffer([58,0,0,0,4]);
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this.stream.write(terminationBuffer);
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};
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Client.prototype.query = function(text) {
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var query = new Query();
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query.client = this;
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query.text = text;
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this.queryQueue.push(query);
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this.pulseQueryQueue();
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return query;
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};
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Client.prototype.pulseQueryQueue = function() {
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if(!this.readyForQuery) {
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return;
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};
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var query = this.queryQueue.shift();
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if(query) {
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var self = this;
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this.readyForQuery = false;
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this.stream.write(query.toBuffer());
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var rowHandler = function(msg) {
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query.emit('row',msg.fields)
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};
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var endHandler;
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endHandler = function(msg) {
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query.emit('end');
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self.removeListener('CommandComplete', endHandler);
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self.removeListener('DataRow', rowHandler);
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};
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this.on('DataRow', rowHandler);
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this.on('CommandComplete', endHandler);
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}
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};
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module.exports = Client;
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