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connection.js
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connection.js
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var utils = require('./connection_utils'),
inherits = require('util').inherits,
net = require('net'),
debug = require('util').debug,
inspect = require('util').inspect,
EventEmitter = require('events').EventEmitter,
inherits = require('util').inherits,
binaryutils = require('../bson/binary_utils'),
tls = require('tls');
var Connection = exports.Connection = function(id, socketOptions) {
// Set up event emitter
EventEmitter.call(this);
// Store all socket options
this.socketOptions = socketOptions ? socketOptions : {host:'localhost', port:27017};
// Id for the connection
this.id = id;
// State of the connection
this.connected = false;
//
// Connection parsing state
//
this.maxBsonSize = socketOptions.maxBsonSize ? socketOptions.maxBsonSize : Connection.DEFAULT_MAX_BSON_SIZE;
// Contains the current message bytes
this.buffer = null;
// Contains the current message size
this.sizeOfMessage = 0;
// Contains the readIndex for the messaage
this.bytesRead = 0;
// Contains spill over bytes from additional messages
this.stubBuffer = 0;
// Just keeps list of events we allow
this.eventHandlers = {error:[], parseError:[], poolReady:[], message:[], close:[], timeout:[], end:[]};
// Just keeps list of events we allow
resetHandlers(this, false);
}
// Set max bson size
Connection.DEFAULT_MAX_BSON_SIZE = 4 * 1024 * 1024 * 4 * 3;
// Inherit event emitter so we can emit stuff wohoo
// inherits(Connection, SimpleEmitter);
inherits(Connection, EventEmitter);
Connection.prototype.start = function() {
// If we have a normal connection
if(this.socketOptions.ssl) {
// Create a new stream
this.connection = new net.Stream();
// Set options on the socket
this.connection.setTimeout(this.socketOptions.timeout);
this.connection.setNoDelay(this.socketOptions.noDelay);
// Set keep alive if defined
if(this.socketOptions.keepAlive > 0) {
this.connection.setKeepAlive(true, this.socketOptions.keepAlive);
} else {
this.connection.setKeepAlive(false);
}
// Set up pair for tls with server, accept self-signed certificates as well
this.pair = tls.createSecurePair(false);
// Set up encrypted streams
this.pair.encrypted.pipe(this.connection);
this.connection.pipe(this.pair.encrypted);
// Setup clearText stream
this.writeSteam = this.pair.cleartext;
// Add all handlers to the socket to manage it
this.pair.on("secure", connectHandler(this));
this.pair.cleartext.on("data", createDataHandler(this));
// Add handlers
this.connection.on("error", errorHandler(this));
// Add all handlers to the socket to manage it
this.connection.on("end", endHandler(this));
this.connection.on("timeout", timeoutHandler(this));
this.connection.on("drain", drainHandler(this));
this.writeSteam.on("close", closeHandler(this));
// Start socket
this.connection.connect(this.socketOptions.port, this.socketOptions.host);
} else {
// Create a new stream
this.connection = new net.Stream();
// // Create new connection instance
this.connection = new net.Socket();
// Set options on the socket
this.connection.setTimeout(this.socketOptions.timeout);
this.connection.setNoDelay(this.socketOptions.noDelay);
// Set keep alive if defined
if(this.socketOptions.keepAlive > 0) {
this.connection.setKeepAlive(true, this.socketOptions.keepAlive);
} else {
this.connection.setKeepAlive(false);
}
// Set up write stream
this.writeSteam = this.connection;
// Add handlers
this.connection.on("error", errorHandler(this));
// Add all handlers to the socket to manage it
this.connection.on("connect", connectHandler(this));
// this.connection.on("end", endHandler(this));
this.connection.on("data", createDataHandler(this));
this.connection.on("timeout", timeoutHandler(this));
this.connection.on("drain", drainHandler(this));
this.connection.on("close", closeHandler(this));
// Start socket
this.connection.connect(this.socketOptions.port, this.socketOptions.host);
}
}
// Check if the sockets are live
Connection.prototype.isConnected = function() {
return this.connected && !this.connection.destroyed && this.connection.writable && this.connection.readable;
}
// Write the data out to the socket
Connection.prototype.write = function(command, callback) {
try {
// If we have a list off commands to be executed on the same socket
if(Array.isArray(command)) {
for(var i = 0; i < command.length; i++) {
var binaryCommand = command[i].toBinary()
if(this.logger != null && this.logger.doDebug) this.logger.debug("writing command to mongodb", binaryCommand);
var r = this.writeSteam.write(binaryCommand);
}
} else {
var binaryCommand = command.toBinary()
if(this.logger != null && this.logger.doDebug) this.logger.debug("writing command to mongodb", binaryCommand);
var r = this.writeSteam.write(binaryCommand);
}
} catch (err) {
if(typeof callback === 'function') callback(err);
}
}
// Force the closure of the connection
Connection.prototype.close = function() {
// clear out all the listeners
resetHandlers(this, true);
// Add a dummy error listener to catch any weird last moment errors (and ignore them)
this.connection.on("error", function() {})
// destroy connection
this.connection.destroy();
}
// Reset all handlers
var resetHandlers = function(self, clearListeners) {
self.eventHandlers = {error:[], connect:[], close:[], end:[], timeout:[], parseError:[], message:[]};
// If we want to clear all the listeners
if(clearListeners && self.connection != null) {
var keys = Object.keys(self.eventHandlers);
// Remove all listeners
for(var i = 0; i < keys.length; i++) {
self.connection.removeAllListeners(keys[i]);
}
}
}
//
// Handlers
//
// Connect handler
var connectHandler = function(self) {
return function() {
// Set connected
self.connected = true;
// Emit the connect event with no error
self.emit("connect", null, self);
}
}
var createDataHandler = exports.Connection.createDataHandler = function(self) {
// We need to handle the parsing of the data
// and emit the messages when there is a complete one
return function(data) {
// console.log("----------------------------------------------------------- DATA :: " + data.length)
// console.dir(data.toString('hex'))
// Parse until we are done with the data
while(data.length > 0) {
// If we still have bytes to read on the current message
if(self.bytesRead > 0 && self.sizeOfMessage > 0) {
// Calculate the amount of remaining bytes
var remainingBytesToRead = self.sizeOfMessage - self.bytesRead;
// Check if the current chunk contains the rest of the message
if(remainingBytesToRead > data.length) {
// Copy the new data into the exiting buffer (should have been allocated when we know the message size)
data.copy(self.buffer, self.bytesRead);
// Adjust the number of bytes read so it point to the correct index in the buffer
self.bytesRead = self.bytesRead + data.length;
// Reset state of buffer
data = new Buffer(0);
} else {
// Copy the missing part of the data into our current buffer
data.copy(self.buffer, self.bytesRead, 0, remainingBytesToRead);
// Slice the overflow into a new buffer that we will then re-parse
data = data.slice(remainingBytesToRead);
// Emit current complete message
try {
self.emit("message", self.buffer, self);
} catch(err) {
var errorObject = {err:"socketHandler", trace:err, bin:buffer, parseState:{
sizeOfMessage:self.sizeOfMessage,
bytesRead:self.bytesRead,
stubBuffer:self.stubBuffer}};
if(self.logger != null && self.logger.doError) self.logger.error("parseError", errorObject);
// We got a parse Error fire it off then keep going
self.emit("parseError", errorObject, self);
}
// Reset state of buffer
self.buffer = null;
self.sizeOfMessage = 0;
self.bytesRead = 0;
self.stubBuffer = null;
}
} else {
// Stub buffer is kept in case we don't get enough bytes to determine the
// size of the message (< 4 bytes)
if(self.stubBuffer != null && self.stubBuffer.length > 0) {
// If we have enough bytes to determine the message size let's do it
if(self.stubBuffer.length + data.length > 4) {
// Prepad the data
var newData = new Buffer(self.stubBuffer.length + data.length);
self.stubBuffer.copy(newData, 0);
data.copy(newData, self.stubBuffer.length);
// Reassign for parsing
data = newData;
// Reset state of buffer
self.buffer = null;
self.sizeOfMessage = 0;
self.bytesRead = 0;
self.stubBuffer = null;
} else {
// Add the the bytes to the stub buffer
var newStubBuffer = new Buffer(self.stubBuffer.length + data.length);
// Copy existing stub buffer
self.stubBuffer.copy(newStubBuffer, 0);
// Copy missing part of the data
data.copy(newStubBuffer, self.stubBuffer.length);
// Exit parsing loop
data = new Buffer(0);
}
} else {
if(data.length > 4) {
// Retrieve the message size
var sizeOfMessage = binaryutils.decodeUInt32(data, 0);
// console.log("=================================================== parse sizeOfMessage")
// console.dir(sizeOfMessage)
// If we have a negative sizeOfMessage emit error and return
if(sizeOfMessage < 0 || sizeOfMessage > self.maxBsonSize) {
var errorObject = {err:"socketHandler", trace:'', bin:self.buffer, parseState:{
sizeOfMessage:sizeOfMessage,
bytesRead:self.bytesRead,
stubBuffer:self.stubBuffer}};
if(self.logger != null && self.logger.doError) self.logger.error("parseError", errorObject);
// We got a parse Error fire it off then keep going
self.emit("parseError", errorObject, self);
return;
}
// console.log("--------------------------------------------------------------------")
// console.dir(sizeOfMessage)
// console.dir(self.maxBsonSize)
// console.dir(data.length)
// Ensure that the size of message is larger than 0 and less than the max allowed
if(sizeOfMessage > 4 && sizeOfMessage < self.maxBsonSize && sizeOfMessage > data.length) {
self.buffer = new Buffer(sizeOfMessage);
// Copy all the data into the buffer
data.copy(self.buffer, 0);
// Update bytes read
self.bytesRead = data.length;
// Update sizeOfMessage
self.sizeOfMessage = sizeOfMessage;
// Ensure stub buffer is null
self.stubBuffer = null;
// Exit parsing loop
data = new Buffer(0);
} else if(sizeOfMessage > 4 && sizeOfMessage < self.maxBsonSize && sizeOfMessage == data.length) {
try {
self.emit("message", data, self);
// Reset state of buffer
self.buffer = null;
self.sizeOfMessage = 0;
self.bytesRead = 0;
self.stubBuffer = null;
// Exit parsing loop
data = new Buffer(0);
} catch (err) {
var errorObject = {err:"socketHandler", trace:err, bin:self.buffer, parseState:{
sizeOfMessage:self.sizeOfMessage,
bytesRead:self.bytesRead,
stubBuffer:self.stubBuffer}};
if(self.logger != null && self.logger.doError) self.logger.error("parseError", errorObject);
// We got a parse Error fire it off then keep going
self.emit("parseError", errorObject, self);
}
} else if(sizeOfMessage <= 4 || sizeOfMessage > self.maxBsonSize) {
var errorObject = {err:"socketHandler", trace:null, bin:data, parseState:{
sizeOfMessage:sizeOfMessage,
bytesRead:0,
buffer:null,
stubBuffer:null}};
if(self.logger != null && self.logger.doError) self.logger.error("parseError", errorObject);
// We got a parse Error fire it off then keep going
self.emit("parseError", errorObject, self);
// Clear out the state of the parser
self.buffer = null;
self.sizeOfMessage = 0;
self.bytesRead = 0;
self.stubBuffer = null;
// Exit parsing loop
data = new Buffer(0);
} else {
try {
self.emit("message", data.slice(0, sizeOfMessage), self);
// Reset state of buffer
self.buffer = null;
self.sizeOfMessage = 0;
self.bytesRead = 0;
self.stubBuffer = null;
// Copy rest of message
data = data.slice(sizeOfMessage);
} catch (err) {
var errorObject = {err:"socketHandler", trace:err, bin:self.buffer, parseState:{
sizeOfMessage:sizeOfMessage,
bytesRead:self.bytesRead,
stubBuffer:self.stubBuffer}};
if(self.logger != null && self.logger.doError) self.logger.error("parseError", errorObject);
// We got a parse Error fire it off then keep going
self.emit("parseError", errorObject, self);
}
}
} else {
// Create a buffer that contains the space for the non-complete message
self.stubBuffer = new Buffer(data.length)
// Copy the data to the stub buffer
data.copy(self.stubBuffer, 0);
// Exit parsing loop
data = new Buffer(0);
}
}
}
}
}
}
var endHandler = function(self) {
return function() {
// Set connected to false
self.connected = false;
// Emit end event
self.emit("end", {err: 'connection received Fin packet from [' + self.socketOptions.host + ':' + self.socketOptions.port + ']'}, self);
// Reset handlers
resetHandlers(self, true);
}
}
var timeoutHandler = function(self) {
return function() {
self.emit("timeout", {err: 'connection to [' + self.socketOptions.host + ':' + self.socketOptions.port + '] timed out'}, self);
// Reset handlers
resetHandlers(self, true);
}
}
var drainHandler = function(self) {
return function() {
}
}
var errorHandler = function(self) {
return function(err) {
// Set connected to false
self.connected = false;
// Emit error
self.emit("error", {err: 'failed to connect to [' + self.socketOptions.host + ':' + self.socketOptions.port + ']'}, self);
// Reset handlers
resetHandlers(self, true);
}
}
var closeHandler = function(self) {
return function(hadError) {
// If we have an error during the connection phase
if(hadError && !self.connected) {
// Set disconnected
self.connected = false;
// Emit error
self.emit("error", {err: 'failed to connect to [' + self.socketOptions.host + ':' + self.socketOptions.port + ']'}, self);
} else {
// Set disconnected
self.connected = false;
// Emit close
self.emit("close", {err: 'connection closed to [' + self.socketOptions.host + ':' + self.socketOptions.port + ']'}, self);
}
// Reset handlers
resetHandlers(self, true);
}
}
// Some basic defaults
Connection.DEFAULT_PORT = 27017;