combined parser and client

This commit is contained in:
brianc 2010-10-20 00:21:13 -05:00
parent 3fe6661819
commit 7d627f8d15
2 changed files with 181 additions and 185 deletions

View File

@ -37,14 +37,14 @@ p.connect = function() {
dataBuffer.copy(fullBuffer, 4, 0);
self.send(null, fullBuffer);
});
var parser = new Parser();
this.stream.on('data', function(buffer) {
parser.setBuffer(buffer);
var msg = parser.parseMessage();
self.setBuffer(buffer);
var msg = self.parseMessage();
while(msg) {
self.emit('message', msg);
self.emit(msg.name, msg);
msg = parser.parseMessage();
msg = self.parseMessage();
}
});
@ -115,4 +115,181 @@ p.pulseQueryQueue = function() {
}
};
//parsing methods
p.setBuffer = function(buffer) {
if(this.lastBuffer) { //we have unfinished biznaz
//need to combine last two buffers
var remaining = this.lastBuffer.length - this.lastOffset;
var combinedBuffer = new Buffer(buffer.length + remaining);
this.lastBuffer.copy(combinedBuffer, 0, this.lastOffset);
buffer.copy(combinedBuffer, remaining, 0);
buffer = combinedBuffer;
}
this.buffer = buffer;
this.offset = 0;
};
var messageNames = {
R: 'authenticationOk',
S: 'parameterStatus',
K: 'backendKeyData',
C: 'commandComplete',
Z: 'readyForQuery',
T: 'rowDescription',
D: 'dataRow',
E: 'error'
};
p.parseMessage = function() {
var remaining = this.buffer.length - this.offset - 1;
if(remaining < 5) {
//cannot read id + length without at least 5 bytes
//just abort the read now
this.lastBuffer = this.buffer;
this.lastOffset = this.offset;
return;
}
var id = this.readChar();
var message = {
id: id,
name: messageNames[id],
length: this.parseInt32()
};
if(remaining < message.length) {
this.lastBuffer = this.buffer;
//rewind the last 5 bytes we read
this.lastOffset = this.offset-5;
return false;
}
return this["parse"+message.id](message);
};
p.parseR = function(msg) {
var code = 0;
if(msg.length == 8) {
code = this.parseInt32();
if(code == 3) {
msg.name = 'authenticationCleartextPassword';
}
return msg;
}
throw new Error("Unknown authenticatinOk message type" + sys.inspect(msg));
};
p.parseS = function(msg) {
msg.parameterName = this.parseCString();
msg.parameterValue = this.parseCString();
return msg;
};
p.parseK = function(msg) {
msg.processID = this.parseInt32();
msg.secretKey = this.parseInt32();
return msg;
};
p.parseC = function(msg) {
msg.text = this.parseCString();
return msg;
};
p.parseZ = function(msg) {
msg.status = this.readChar();
return msg;
};
p.parseT = function(msg) {
msg.fieldCount = this.parseInt16();
var fields = [];
for(var i = 0; i < msg.fieldCount; i++){
fields[i] = this.parseField();
}
msg.fields = fields;
return msg;
};
p.parseField = function() {
var field = {
name: this.parseCString(),
tableID: this.parseInt32(),
columnID: this.parseInt16(),
dataTypeID: this.parseInt32(),
dataTypeSize: this.parseInt16(),
dataTypeModifier: this.parseInt32(),
format: this.parseInt16() == 0 ? 'text' : 'binary'
};
return field;
};
p.parseD = function(msg) {
var fieldCount = this.parseInt16();
var fields = [];
for(var i = 0; i < fieldCount; i++) {
var length = this.parseInt32();
fields[i] = (length == -1 ? null : this.readString(length))
};
msg.fieldCount = fieldCount;
msg.fields = fields;
return msg;
};
p.parseE = function(msg) {
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.readChar = function() {
return Buffer([this.buffer[this.offset++]]).toString('utf8');
};
p.parseInt32 = function() {
var value = this.peekInt32();
this.offset += 4;
return value;
};
p.peekInt32 = function(offset) {
offset = offset || this.offset;
var buffer = this.buffer;
return ((buffer[offset++] << 24) +
(buffer[offset++] << 16) +
(buffer[offset++] << 8) +
buffer[offset++]);
};
p.parseInt16 = function() {
return ((this.buffer[this.offset++] << 8) +
(this.buffer[this.offset++] << 0));
};
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);
};
//end parsing methods
module.exports = Client;

View File

@ -1,181 +0,0 @@
var Parser = function() { };
var p = Parser.prototype;
p.setBuffer = function(buffer) {
if(this.lastBuffer) { //we have unfinished biznaz
//need to combine last two buffers
var remaining = this.lastBuffer.length - this.lastOffset;
var combinedBuffer = new Buffer(buffer.length + remaining);
this.lastBuffer.copy(combinedBuffer, 0, this.lastOffset);
buffer.copy(combinedBuffer, remaining, 0);
buffer = combinedBuffer;
}
this.buffer = buffer;
this.offset = 0;
};
var messageNames = {
R: 'authenticationOk',
S: 'parameterStatus',
K: 'backendKeyData',
C: 'commandComplete',
Z: 'readyForQuery',
T: 'rowDescription',
D: 'dataRow',
E: 'error'
};
p.parseMessage = function() {
var remaining = this.buffer.length - this.offset - 1;
if(remaining < 5) {
//cannot read id + length without at least 5 bytes
//just abort the read now
this.lastBuffer = this.buffer;
this.lastOffset = this.offset;
return;
}
var id = this.readChar();
var message = {
id: id,
name: messageNames[id],
length: this.parseInt32()
};
if(remaining < message.length) {
this.lastBuffer = this.buffer;
//rewind the last 5 bytes we read
this.lastOffset = this.offset-5;
return false;
}
return this["parse"+message.id](message);
};
p.parseR = function(msg) {
var code = 0;
if(msg.length == 8) {
code = this.parseInt32();
if(code == 3) {
msg.name = 'authenticationCleartextPassword';
}
return msg;
}
throw new Error("Unknown authenticatinOk message type" + sys.inspect(msg));
};
p.parseS = function(msg) {
msg.parameterName = this.parseCString();
msg.parameterValue = this.parseCString();
return msg;
};
p.parseK = function(msg) {
msg.processID = this.parseInt32();
msg.secretKey = this.parseInt32();
return msg;
};
p.parseC = function(msg) {
msg.text = this.parseCString();
return msg;
};
p.parseZ = function(msg) {
msg.status = this.readChar();
return msg;
};
p.parseT = function(msg) {
msg.fieldCount = this.parseInt16();
var fields = [];
for(var i = 0; i < msg.fieldCount; i++){
fields[i] = this.parseField();
}
msg.fields = fields;
return msg;
};
p.parseField = function() {
var field = {
name: this.parseCString(),
tableID: this.parseInt32(),
columnID: this.parseInt16(),
dataTypeID: this.parseInt32(),
dataTypeSize: this.parseInt16(),
dataTypeModifier: this.parseInt32(),
format: this.parseInt16() == 0 ? 'text' : 'binary'
};
return field;
};
p.parseD = function(msg) {
var fieldCount = this.parseInt16();
var fields = [];
for(var i = 0; i < fieldCount; i++) {
var length = this.parseInt32();
fields[i] = (length == -1 ? null : this.readString(length))
};
msg.fieldCount = fieldCount;
msg.fields = fields;
return msg;
};
p.parseE = function(msg) {
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.readChar = function() {
return Buffer([this.buffer[this.offset++]]).toString('utf8');
};
p.parseInt32 = function() {
var value = this.peekInt32();
this.offset += 4;
return value;
};
p.peekInt32 = function(offset) {
offset = offset || this.offset;
var buffer = this.buffer;
return ((buffer[offset++] << 24) +
(buffer[offset++] << 16) +
(buffer[offset++] << 8) +
buffer[offset++]);
};
p.parseInt16 = function() {
return ((this.buffer[this.offset++] << 8) +
(this.buffer[this.offset++] << 0));
};
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;