moved items to their own file

This commit is contained in:
brianc 2010-10-10 22:37:30 -05:00
parent f7529a235a
commit 5c6f95b427
4 changed files with 280 additions and 271 deletions

94
lib/client.js Normal file
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@ -0,0 +1,94 @@
var EventEmitter = require('events').EventEmitter;
var net = require('net');
var Query = require(__dirname+'/query');
var Parser = require(__dirname+'/parser');
var Client = function(config) {
EventEmitter.call(this);
config = config || {};
this.user = config.user;
this.database = config.database;
this.port = config.port || 5432;
this.host = config.host;
this.queryQueue = [];
this.stream = config.stream || new net.Stream();
this.queryQueue = [];
};
sys.inherits(Client, EventEmitter);
Client.prototype.connect = function() {
if(this.stream.readyState == 'closed'){
this.stream.connect(this.port, this.host);
}
var self = this;
this.stream.on('connect', function() {
var data = ['user',self.user,'database', self.database, '\0'].join('\0');
var dataBuffer = Buffer(data);
var fullBuffer = Buffer(8 + dataBuffer.length);
fullBuffer[0] = fullBuffer.length >>> 24;
fullBuffer[1] = fullBuffer.length >>> 16;
fullBuffer[2] = fullBuffer.length >>> 8;
fullBuffer[3] = fullBuffer.length >>> 0;
fullBuffer[4] = 0;
fullBuffer[5] = 3;
fullBuffer[6] = 0;
fullBuffer[7] = 0;
fullBuffer.write(data,8);
self.stream.write(fullBuffer);
});
this.stream.on('data', function(data) {
var parser = new Parser(data);
var msg = parser.parseMessage();
while(msg) {
self.emit('message', msg);
self.emit(msg.name, msg);
msg = parser.parseMessage();
}
});
this.on('ReadyForQuery', function() {
self.readyForQuery = true;
self.pulseQueryQueue();
});
};
Client.prototype.disconnect = function() {
var terminationBuffer = new Buffer([58,0,0,0,4]);
this.stream.write(terminationBuffer);
};
Client.prototype.query = function(text) {
var query = new Query();
query.client = this;
query.text = text;
this.queryQueue.push(query);
this.pulseQueryQueue();
return query;
};
Client.prototype.pulseQueryQueue = function() {
if(!this.readyForQuery) {
return;
};
var query = this.queryQueue.shift();
if(query) {
var self = this;
this.readyForQuery = false;
this.stream.write(query.toBuffer());
var rowHandler = function(msg) {
query.emit('row',msg.fields)
};
var endHandler;
endHandler = function(msg) {
query.emit('end');
self.removeListener('CommandComplete', endHandler);
self.removeListener('DataRow', rowHandler);
};
this.on('DataRow', rowHandler);
this.on('CommandComplete', endHandler);
}
};
module.exports = Client;

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@ -2,276 +2,6 @@ var EventEmitter = require('events').EventEmitter;
var sys = require('sys');
var net = require('net');
var Client = function(config) {
EventEmitter.call(this);
config = config || {};
this.user = config.user;
this.database = config.database;
this.port = config.port || 5432;
this.host = config.host;
this.queryQueue = [];
this.stream = config.stream || new net.Stream();
this.queryQueue = [];
};
sys.inherits(Client, EventEmitter);
Client.prototype.connect = function() {
if(this.stream.readyState == 'closed'){
this.stream.connect(this.port, this.host);
}
var self = this;
this.stream.on('connect', function() {
var data = ['user',self.user,'database', self.database, '\0'].join('\0');
var dataBuffer = Buffer(data);
var fullBuffer = Buffer(8 + dataBuffer.length);
fullBuffer[0] = fullBuffer.length >>> 24;
fullBuffer[1] = fullBuffer.length >>> 16;
fullBuffer[2] = fullBuffer.length >>> 8;
fullBuffer[3] = fullBuffer.length >>> 0;
fullBuffer[4] = 0;
fullBuffer[5] = 3;
fullBuffer[6] = 0;
fullBuffer[7] = 0;
fullBuffer.write(data,8);
self.stream.write(fullBuffer);
});
this.stream.on('data', function(data) {
var parser = new Parser(data);
var msg = parser.parseMessage();
while(msg) {
self.emit('message', msg);
self.emit(msg.name, msg);
msg = parser.parseMessage();
}
});
this.on('ReadyForQuery', function() {
self.readyForQuery = true;
self.pulseQueryQueue();
});
};
Client.prototype.disconnect = function() {
var terminationBuffer = new Buffer([58,0,0,0,4]);
this.stream.write(terminationBuffer);
};
Client.prototype.query = function(text) {
var query = new Query();
query.client = this;
query.text = text;
this.queryQueue.push(query);
this.pulseQueryQueue();
return query;
};
Client.prototype.pulseQueryQueue = function() {
if(!this.readyForQuery) {
return;
};
var query = this.queryQueue.shift();
if(query) {
var self = this;
this.readyForQuery = false;
this.stream.write(query.toBuffer());
var rowHandler = function(msg) {
query.emit('row',msg.fields)
};
var endHandler;
endHandler = function(msg) {
query.emit('end');
self.removeListener('CommandComplete', endHandler);
self.removeListener('DataRow', rowHandler);
};
this.on('DataRow', rowHandler);
this.on('CommandComplete', endHandler);
}
};
var Query = function() {
EventEmitter.call(this);
};
sys.inherits(Query, EventEmitter);
Query.prototype.toBuffer = function() {
var textBuffer = new Buffer(this.text+'\0','utf8');
var len = textBuffer.length + 4;
var fullBuffer = new Buffer(len + 1);
fullBuffer[0] = 0x51;
fullBuffer[1] = len >>> 24;
fullBuffer[2] = len >>> 16;
fullBuffer[3] = len >>> 8;
fullBuffer[4] = len >>> 0;
textBuffer.copy(fullBuffer,5,0);
return fullBuffer;
};
var Parser = function(buffer) {
this.offset = 0;
this.buffer = buffer;
};
var p = Parser.prototype;
p.parseMessage = function() {
if(this.buffer.length == this.offset) {
return false;
}
var messageID = this.buffer[this.offset];
return this["parse"+messageID]();
};
//parse 'R' message
p.parse82 = function() {
var type = this.buffer[this.offset++];
var length = this.parseLength();
if(length == 8) {
this.offset += 4;
return {
name: 'AuthenticationOk',
id: 'R',
length: length
}
}
throw new Error("Unknown AuthenticatinOk message type");
};
//parse 'S' message
p.parse83 = function(buffer) {
var msg = this.parseStart('ParameterStatus');
msg.parameterName = this.parseCString();
msg.parameterValue = this.parseCString();
return msg;
};
//parse 'K' message
p.parse75 = function() {
var msg = this.parseStart('BackendKeyData');
msg.processID = this.readInt32();
msg.secretKey = this.readInt32();
return msg;
};
//parse 'C' message
p.parse67 = function() {
var msg = this.parseStart('CommandComplete');
msg.text = this.parseCString();
return msg;
};
//parses common start of message packets
p.parseStart = function(name) {
return {
name: name,
id: this.readChar(),
length: this.readInt32()
}
};
p.readChar = function() {
return Buffer([this.buffer[this.offset++]]).toString('utf8');
};
//parse 'Z' message
p.parse90 = function() {
var msg = this.parseStart('ReadyForQuery');
msg.status = this.readChar();
return msg;
};
//parse 'T' message
p.parse84 = function() {
var msg = this.parseStart('RowDescription');
msg.fieldCount = this.readInt16();
var fields = [];
for(var i = 0; i < msg.fieldCount; i++){
fields[i] = this.parseField();
}
msg.fields = fields;
return msg;
};
p.parseField = function() {
var row = {
name: this.parseCString(),
tableID: this.readInt32(),
columnID: this.readInt16(),
dataType: this.readInt32(),
dataTypeSize: this.readInt16(),
dataTypeModifier: this.readInt32(),
format: this.readInt16() == 0 ? 'text' : 'binary'
};
return row;
};
//parse 'D' message
p.parse68 = function() {
var msg = this.parseStart('DataRow');
var fieldCount = this.readInt16();
var fields = [];
for(var i = 0; i < fieldCount; i++) {
fields[i] = this.readString(this.readInt32());
};
msg.fieldCount = fieldCount;
msg.fields = fields;
return msg;
};
//parse 'E' message
p.parse69 = function() {
var msg = this.parseStart('Error');
var fields = {};
var fieldType = this.readString(1);
while(fieldType != '\0') {
fields[fieldType] = this.parseCString();
fieldType = this.readString(1);
}
msg.severity = fields.S;
msg.code = fields.C;
msg.message = fields.M;
msg.detail = fields.D;
msg.hint = fields.H;
msg.position = fields.P;
msg.internalPosition = fields.p;
msg.internalQuery = fields.q;
msg.where = fields.W;
msg.file = fields.F;
msg.line = fields.L;
msg.routine = fields.R;
return msg;
};
p.readInt32 = function() {
var buffer = this.buffer;
return ((buffer[this.offset++] << 24) +
(buffer[this.offset++] << 16) +
(buffer[this.offset++] << 8) +
buffer[this.offset++]);
};
p.readInt16 = function() {
return ((this.buffer[this.offset++] << 8) + (this.buffer[this.offset++] << 0));
};
p.parseLength = function() {
return this.readInt32();
};
p.readString = function(length) {
return this.buffer.toString('utf8', this.offset, (this.offset += length));
};
p.parseCString = function() {
var start = this.offset;
while(this.buffer[this.offset++]) { };
return this.buffer.toString('utf8',start, this.offset - 1);
};
module.exports = {
Client: Client,
Parser: Parser
Client: require(__dirname+'/client')
};

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lib/parser.js Normal file
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var Parser = function(buffer) {
this.offset = 0;
this.buffer = buffer;
};
var p = Parser.prototype;
p.parseMessage = function() {
if(this.buffer.length == this.offset) {
return false;
}
var messageID = this.buffer[this.offset];
return this["parse"+messageID]();
};
//parse 'R' message
p.parse82 = function() {
var type = this.buffer[this.offset++];
var length = this.parseLength();
if(length == 8) {
this.offset += 4;
return {
name: 'AuthenticationOk',
id: 'R',
length: length
}
}
throw new Error("Unknown AuthenticatinOk message type");
};
//parse 'S' message
p.parse83 = function(buffer) {
var msg = this.parseStart('ParameterStatus');
msg.parameterName = this.parseCString();
msg.parameterValue = this.parseCString();
return msg;
};
//parse 'K' message
p.parse75 = function() {
var msg = this.parseStart('BackendKeyData');
msg.processID = this.readInt32();
msg.secretKey = this.readInt32();
return msg;
};
//parse 'C' message
p.parse67 = function() {
var msg = this.parseStart('CommandComplete');
msg.text = this.parseCString();
return msg;
};
//parses common start of message packets
p.parseStart = function(name) {
return {
name: name,
id: this.readChar(),
length: this.readInt32()
}
};
p.readChar = function() {
return Buffer([this.buffer[this.offset++]]).toString('utf8');
};
//parse 'Z' message
p.parse90 = function() {
var msg = this.parseStart('ReadyForQuery');
msg.status = this.readChar();
return msg;
};
//parse 'T' message
p.parse84 = function() {
var msg = this.parseStart('RowDescription');
msg.fieldCount = this.readInt16();
var fields = [];
for(var i = 0; i < msg.fieldCount; i++){
fields[i] = this.parseField();
}
msg.fields = fields;
return msg;
};
p.parseField = function() {
var row = {
name: this.parseCString(),
tableID: this.readInt32(),
columnID: this.readInt16(),
dataType: this.readInt32(),
dataTypeSize: this.readInt16(),
dataTypeModifier: this.readInt32(),
format: this.readInt16() == 0 ? 'text' : 'binary'
};
return row;
};
//parse 'D' message
p.parse68 = function() {
var msg = this.parseStart('DataRow');
var fieldCount = this.readInt16();
var fields = [];
for(var i = 0; i < fieldCount; i++) {
fields[i] = this.readString(this.readInt32());
};
msg.fieldCount = fieldCount;
msg.fields = fields;
return msg;
};
//parse 'E' message
p.parse69 = function() {
var msg = this.parseStart('Error');
var fields = {};
var fieldType = this.readString(1);
while(fieldType != '\0') {
fields[fieldType] = this.parseCString();
fieldType = this.readString(1);
}
msg.severity = fields.S;
msg.code = fields.C;
msg.message = fields.M;
msg.detail = fields.D;
msg.hint = fields.H;
msg.position = fields.P;
msg.internalPosition = fields.p;
msg.internalQuery = fields.q;
msg.where = fields.W;
msg.file = fields.F;
msg.line = fields.L;
msg.routine = fields.R;
return msg;
};
p.readInt32 = function() {
var buffer = this.buffer;
return ((buffer[this.offset++] << 24) +
(buffer[this.offset++] << 16) +
(buffer[this.offset++] << 8) +
buffer[this.offset++]);
};
p.readInt16 = function() {
return ((this.buffer[this.offset++] << 8) + (this.buffer[this.offset++] << 0));
};
p.parseLength = function() {
return this.readInt32();
};
p.readString = function(length) {
return this.buffer.toString('utf8', this.offset, (this.offset += length));
};
p.parseCString = function() {
var start = this.offset;
while(this.buffer[this.offset++]) { };
return this.buffer.toString('utf8',start, this.offset - 1);
};
module.exports = Parser;

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lib/query.js Normal file
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var EventEmitter = require('events').EventEmitter;
var Query = function() {
EventEmitter.call(this);
};
sys.inherits(Query, EventEmitter);
Query.prototype.toBuffer = function() {
var textBuffer = new Buffer(this.text+'\0','utf8');
var len = textBuffer.length + 4;
var fullBuffer = new Buffer(len + 1);
fullBuffer[0] = 0x51;
fullBuffer[1] = len >>> 24;
fullBuffer[2] = len >>> 16;
fullBuffer[3] = len >>> 8;
fullBuffer[4] = len >>> 0;
textBuffer.copy(fullBuffer,5,0);
return fullBuffer;
};
module.exports = Query;