merged

6 files changed, 2526 insertions, 0 deletions

diff --git a/node_modules/mongodb-core/lib/connection/command_result.js b/node_modules/mongodb-core/lib/connection/command_result.js
new file mode 100644
index 0000000..eb7b27a
--- /dev/null
+++ b/node_modules/mongodb-core/lib/connection/command_result.js
@@ -0,0 +1,38 @@
+"use strict";
+
+var setProperty = require('../connection/utils').setProperty
+  , getProperty = require('../connection/utils').getProperty
+  , getSingleProperty = require('../connection/utils').getSingleProperty;
+
+/**
+ * Creates a new CommandResult instance
+ * @class
+ * @param {object} result CommandResult object
+ * @param {Connection} connection A connection instance associated with this result
+ * @return {CommandResult} A cursor instance
+ */
+var CommandResult = function(result, connection, message) {
+  this.result = result;
+  this.connection = connection;
+  this.message = message;
+}
+
+/**
+ * Convert CommandResult to JSON
+ * @method
+ * @return {object}
+ */
+CommandResult.prototype.toJSON = function() {
+  return this.result;
+}
+
+/**
+ * Convert CommandResult to String representation
+ * @method
+ * @return {string}
+ */
+CommandResult.prototype.toString = function() {
+  return JSON.stringify(this.toJSON());
+}
+
+module.exports = CommandResult;
diff --git a/node_modules/mongodb-core/lib/connection/commands.js b/node_modules/mongodb-core/lib/connection/commands.js
new file mode 100644
index 0000000..dba0d1e
--- /dev/null
+++ b/node_modules/mongodb-core/lib/connection/commands.js
@@ -0,0 +1,539 @@
+"use strict";
+
+var f = require('util').format
+  , Long = require('bson').Long
+  , setProperty = require('./utils').setProperty
+  , getProperty = require('./utils').getProperty
+  , getSingleProperty = require('./utils').getSingleProperty;
+
+// Incrementing request id
+var _requestId = 0;
+
+// Wire command operation ids
+var OP_QUERY = 2004;
+var OP_GETMORE = 2005;
+var OP_KILL_CURSORS = 2007;
+
+// Query flags
+var OPTS_NONE = 0;
+var OPTS_TAILABLE_CURSOR = 2;
+var OPTS_SLAVE = 4;
+var OPTS_OPLOG_REPLAY = 8;
+var OPTS_NO_CURSOR_TIMEOUT = 16;
+var OPTS_AWAIT_DATA = 32;
+var OPTS_EXHAUST = 64;
+var OPTS_PARTIAL = 128;
+
+// Response flags
+var CURSOR_NOT_FOUND = 0;
+var QUERY_FAILURE = 2;
+var SHARD_CONFIG_STALE = 4;
+var AWAIT_CAPABLE = 8;
+
+/**************************************************************
+ * QUERY
+ **************************************************************/
+var Query = function(bson, ns, query, options) {
+  var self = this;
+  // Basic options needed to be passed in
+  if(ns == null) throw new Error("ns must be specified for query");
+  if(query == null) throw new Error("query must be specified for query");
+
+  // Validate that we are not passing 0x00 in the colletion name
+  if(!!~ns.indexOf("\x00")) {
+    throw new Error("namespace cannot contain a null character");
+  }
+
+  // Basic options
+  this.bson = bson;
+  this.ns = ns;
+  this.query = query;
+
+  // Ensure empty options
+  this.options = options || {};
+
+  // Additional options
+  this.numberToSkip = options.numberToSkip || 0;
+  this.numberToReturn = options.numberToReturn || 0;
+  this.returnFieldSelector = options.returnFieldSelector || null;
+  this.requestId = _requestId++;
+
+  // Serialization option
+  this.serializeFunctions = typeof options.serializeFunctions == 'boolean' ? options.serializeFunctions : false;
+  this.ignoreUndefined = typeof options.ignoreUndefined == 'boolean' ? options.ignoreUndefined : false;
+  this.maxBsonSize = options.maxBsonSize || 1024 * 1024 * 16;
+  this.checkKeys = typeof options.checkKeys == 'boolean' ? options.checkKeys : true;
+  this.batchSize = self.numberToReturn;
+
+  // Flags
+  this.tailable = false;
+  this.slaveOk = typeof options.slaveOk == 'boolean'? options.slaveOk : false;
+  this.oplogReplay = false;
+  this.noCursorTimeout = false;
+  this.awaitData = false;
+  this.exhaust = false;
+  this.partial = false;
+}
+
+//
+// Assign a new request Id
+Query.prototype.incRequestId = function() {
+  this.requestId = _requestId++;
+}
+
+//
+// Assign a new request Id
+Query.nextRequestId = function() {
+  return _requestId + 1;
+}
+
+//
+// Uses a single allocated buffer for the process, avoiding multiple memory allocations
+Query.prototype.toBin = function() {
+  var self = this;
+  var buffers = [];
+  var projection = null;
+
+  // Set up the flags
+  var flags = 0;
+  if(this.tailable) {
+    flags |= OPTS_TAILABLE_CURSOR;
+  }
+
+  if(this.slaveOk) {
+    flags |= OPTS_SLAVE;
+  }
+
+  if(this.oplogReplay) {
+    flags |= OPTS_OPLOG_REPLAY;
+  }
+
+  if(this.noCursorTimeout) {
+    flags |= OPTS_NO_CURSOR_TIMEOUT;
+  }
+
+  if(this.awaitData) {
+    flags |= OPTS_AWAIT_DATA;
+  }
+
+  if(this.exhaust) {
+    flags |= OPTS_EXHAUST;
+  }
+
+  if(this.partial) {
+    flags |= OPTS_PARTIAL;
+  }
+
+  // If batchSize is different to self.numberToReturn
+  if(self.batchSize != self.numberToReturn) self.numberToReturn = self.batchSize;
+
+  // Allocate write protocol header buffer
+  var header = new Buffer(
+    4 * 4 // Header
+    + 4   // Flags
+    + Buffer.byteLength(self.ns) + 1 // namespace
+    + 4 // numberToSkip
+    + 4 // numberToReturn
+  );
+
+  // Add header to buffers
+  buffers.push(header);
+
+  // Serialize the query
+  var query = self.bson.serialize(this.query
+    , this.checkKeys
+    , true
+    , this.serializeFunctions
+    , 0, this.ignoreUndefined);
+
+  // Add query document
+  buffers.push(query);
+
+  if(self.returnFieldSelector && Object.keys(self.returnFieldSelector).length > 0) {
+    // Serialize the projection document
+    projection = self.bson.serialize(this.returnFieldSelector, this.checkKeys, true, this.serializeFunctions, this.ignoreUndefined);
+    // Add projection document
+    buffers.push(projection);
+  }
+
+  // Total message size
+  var totalLength = header.length + query.length + (projection ? projection.length : 0);
+
+  // Set up the index
+  var index = 4;
+
+  // Write total document length
+  header[3] = (totalLength >> 24) & 0xff;
+  header[2] = (totalLength >> 16) & 0xff;
+  header[1] = (totalLength >> 8) & 0xff;
+  header[0] = (totalLength) & 0xff;
+
+  // Write header information requestId
+  header[index + 3] = (this.requestId >> 24) & 0xff;
+  header[index + 2] = (this.requestId >> 16) & 0xff;
+  header[index + 1] = (this.requestId >> 8) & 0xff;
+  header[index] = (this.requestId) & 0xff;
+  index = index + 4;
+
+  // Write header information responseTo
+  header[index + 3] = (0 >> 24) & 0xff;
+  header[index + 2] = (0 >> 16) & 0xff;
+  header[index + 1] = (0 >> 8) & 0xff;
+  header[index] = (0) & 0xff;
+  index = index + 4;
+
+  // Write header information OP_QUERY
+  header[index + 3] = (OP_QUERY >> 24) & 0xff;
+  header[index + 2] = (OP_QUERY >> 16) & 0xff;
+  header[index + 1] = (OP_QUERY >> 8) & 0xff;
+  header[index] = (OP_QUERY) & 0xff;
+  index = index + 4;
+
+  // Write header information flags
+  header[index + 3] = (flags >> 24) & 0xff;
+  header[index + 2] = (flags >> 16) & 0xff;
+  header[index + 1] = (flags >> 8) & 0xff;
+  header[index] = (flags) & 0xff;
+  index = index + 4;
+
+  // Write collection name
+  index = index + header.write(this.ns, index, 'utf8') + 1;
+  header[index - 1] = 0;
+
+  // Write header information flags numberToSkip
+  header[index + 3] = (this.numberToSkip >> 24) & 0xff;
+  header[index + 2] = (this.numberToSkip >> 16) & 0xff;
+  header[index + 1] = (this.numberToSkip >> 8) & 0xff;
+  header[index] = (this.numberToSkip) & 0xff;
+  index = index + 4;
+
+  // Write header information flags numberToReturn
+  header[index + 3] = (this.numberToReturn >> 24) & 0xff;
+  header[index + 2] = (this.numberToReturn >> 16) & 0xff;
+  header[index + 1] = (this.numberToReturn >> 8) & 0xff;
+  header[index] = (this.numberToReturn) & 0xff;
+  index = index + 4;
+
+  // Return the buffers
+  return buffers;
+}
+
+Query.getRequestId = function() {
+  return ++_requestId;
+}
+
+/**************************************************************
+ * GETMORE
+ **************************************************************/
+var GetMore = function(bson, ns, cursorId, opts) {
+  opts = opts || {};
+  this.numberToReturn = opts.numberToReturn || 0;
+  this.requestId = _requestId++;
+  this.bson = bson;
+  this.ns = ns;
+  this.cursorId = cursorId;
+}
+
+//
+// Uses a single allocated buffer for the process, avoiding multiple memory allocations
+GetMore.prototype.toBin = function() {
+  var length = 4 + Buffer.byteLength(this.ns) + 1 + 4 + 8 + (4 * 4);
+  // Create command buffer
+  var index = 0;
+  // Allocate buffer
+  var _buffer = new Buffer(length);
+
+  // Write header information
+  // index = write32bit(index, _buffer, length);
+  _buffer[index + 3] = (length >> 24) & 0xff;
+  _buffer[index + 2] = (length >> 16) & 0xff;
+  _buffer[index + 1] = (length >> 8) & 0xff;
+  _buffer[index] = (length) & 0xff;
+  index = index + 4;
+
+  // index = write32bit(index, _buffer, requestId);
+  _buffer[index + 3] = (this.requestId >> 24) & 0xff;
+  _buffer[index + 2] = (this.requestId >> 16) & 0xff;
+  _buffer[index + 1] = (this.requestId >> 8) & 0xff;
+  _buffer[index] = (this.requestId) & 0xff;
+  index = index + 4;
+
+  // index = write32bit(index, _buffer, 0);
+  _buffer[index + 3] = (0 >> 24) & 0xff;
+  _buffer[index + 2] = (0 >> 16) & 0xff;
+  _buffer[index + 1] = (0 >> 8) & 0xff;
+  _buffer[index] = (0) & 0xff;
+  index = index + 4;
+
+  // index = write32bit(index, _buffer, OP_GETMORE);
+  _buffer[index + 3] = (OP_GETMORE >> 24) & 0xff;
+  _buffer[index + 2] = (OP_GETMORE >> 16) & 0xff;
+  _buffer[index + 1] = (OP_GETMORE >> 8) & 0xff;
+  _buffer[index] = (OP_GETMORE) & 0xff;
+  index = index + 4;
+
+  // index = write32bit(index, _buffer, 0);
+  _buffer[index + 3] = (0 >> 24) & 0xff;
+  _buffer[index + 2] = (0 >> 16) & 0xff;
+  _buffer[index + 1] = (0 >> 8) & 0xff;
+  _buffer[index] = (0) & 0xff;
+  index = index + 4;
+
+  // Write collection name
+  index = index + _buffer.write(this.ns, index, 'utf8') + 1;
+  _buffer[index - 1] = 0;
+
+  // Write batch size
+  // index = write32bit(index, _buffer, numberToReturn);
+  _buffer[index + 3] = (this.numberToReturn >> 24) & 0xff;
+  _buffer[index + 2] = (this.numberToReturn >> 16) & 0xff;
+  _buffer[index + 1] = (this.numberToReturn >> 8) & 0xff;
+  _buffer[index] = (this.numberToReturn) & 0xff;
+  index = index + 4;
+
+  // Write cursor id
+  // index = write32bit(index, _buffer, cursorId.getLowBits());
+  _buffer[index + 3] = (this.cursorId.getLowBits() >> 24) & 0xff;
+  _buffer[index + 2] = (this.cursorId.getLowBits() >> 16) & 0xff;
+  _buffer[index + 1] = (this.cursorId.getLowBits() >> 8) & 0xff;
+  _buffer[index] = (this.cursorId.getLowBits()) & 0xff;
+  index = index + 4;
+
+  // index = write32bit(index, _buffer, cursorId.getHighBits());
+  _buffer[index + 3] = (this.cursorId.getHighBits() >> 24) & 0xff;
+  _buffer[index + 2] = (this.cursorId.getHighBits() >> 16) & 0xff;
+  _buffer[index + 1] = (this.cursorId.getHighBits() >> 8) & 0xff;
+  _buffer[index] = (this.cursorId.getHighBits()) & 0xff;
+  index = index + 4;
+
+  // Return buffer
+  return _buffer;
+}
+
+/**************************************************************
+ * KILLCURSOR
+ **************************************************************/
+var KillCursor = function(bson, cursorIds) {
+  this.requestId = _requestId++;
+  this.cursorIds = cursorIds;
+}
+
+//
+// Uses a single allocated buffer for the process, avoiding multiple memory allocations
+KillCursor.prototype.toBin = function() {
+  var length = 4 + 4 + (4 * 4) + (this.cursorIds.length * 8);
+
+  // Create command buffer
+  var index = 0;
+  var _buffer = new Buffer(length);
+
+  // Write header information
+  // index = write32bit(index, _buffer, length);
+  _buffer[index + 3] = (length >> 24) & 0xff;
+  _buffer[index + 2] = (length >> 16) & 0xff;
+  _buffer[index + 1] = (length >> 8) & 0xff;
+  _buffer[index] = (length) & 0xff;
+  index = index + 4;
+
+  // index = write32bit(index, _buffer, requestId);
+  _buffer[index + 3] = (this.requestId >> 24) & 0xff;
+  _buffer[index + 2] = (this.requestId >> 16) & 0xff;
+  _buffer[index + 1] = (this.requestId >> 8) & 0xff;
+  _buffer[index] = (this.requestId) & 0xff;
+  index = index + 4;
+
+  // index = write32bit(index, _buffer, 0);
+  _buffer[index + 3] = (0 >> 24) & 0xff;
+  _buffer[index + 2] = (0 >> 16) & 0xff;
+  _buffer[index + 1] = (0 >> 8) & 0xff;
+  _buffer[index] = (0) & 0xff;
+  index = index + 4;
+
+  // index = write32bit(index, _buffer, OP_KILL_CURSORS);
+  _buffer[index + 3] = (OP_KILL_CURSORS >> 24) & 0xff;
+  _buffer[index + 2] = (OP_KILL_CURSORS >> 16) & 0xff;
+  _buffer[index + 1] = (OP_KILL_CURSORS >> 8) & 0xff;
+  _buffer[index] = (OP_KILL_CURSORS) & 0xff;
+  index = index + 4;
+
+  // index = write32bit(index, _buffer, 0);
+  _buffer[index + 3] = (0 >> 24) & 0xff;
+  _buffer[index + 2] = (0 >> 16) & 0xff;
+  _buffer[index + 1] = (0 >> 8) & 0xff;
+  _buffer[index] = (0) & 0xff;
+  index = index + 4;
+
+  // Write batch size
+  // index = write32bit(index, _buffer, this.cursorIds.length);
+  _buffer[index + 3] = (this.cursorIds.length >> 24) & 0xff;
+  _buffer[index + 2] = (this.cursorIds.length >> 16) & 0xff;
+  _buffer[index + 1] = (this.cursorIds.length >> 8) & 0xff;
+  _buffer[index] = (this.cursorIds.length) & 0xff;
+  index = index + 4;
+
+  // Write all the cursor ids into the array
+  for(var i = 0; i < this.cursorIds.length; i++) {
+    // Write cursor id
+    // index = write32bit(index, _buffer, cursorIds[i].getLowBits());
+    _buffer[index + 3] = (this.cursorIds[i].getLowBits() >> 24) & 0xff;
+    _buffer[index + 2] = (this.cursorIds[i].getLowBits() >> 16) & 0xff;
+    _buffer[index + 1] = (this.cursorIds[i].getLowBits() >> 8) & 0xff;
+    _buffer[index] = (this.cursorIds[i].getLowBits()) & 0xff;
+    index = index + 4;
+
+    // index = write32bit(index, _buffer, cursorIds[i].getHighBits());
+    _buffer[index + 3] = (this.cursorIds[i].getHighBits() >> 24) & 0xff;
+    _buffer[index + 2] = (this.cursorIds[i].getHighBits() >> 16) & 0xff;
+    _buffer[index + 1] = (this.cursorIds[i].getHighBits() >> 8) & 0xff;
+    _buffer[index] = (this.cursorIds[i].getHighBits()) & 0xff;
+    index = index + 4;
+  }
+
+  // Return buffer
+  return _buffer;
+}
+
+var Response = function(bson, data, opts) {
+  opts = opts || {promoteLongs: true};
+  this.parsed = false;
+
+  //
+  // Parse Header
+  //
+  this.index = 0;
+  this.raw = data;
+  this.data = data;
+  this.bson = bson;
+  this.opts = opts;
+
+  // Read the message length
+  this.length = data[this.index] | data[this.index + 1] << 8 | data[this.index + 2] << 16 | data[this.index + 3] << 24;
+  this.index = this.index + 4;
+
+  // Fetch the request id for this reply
+  this.requestId = data[this.index] | data[this.index + 1] << 8 | data[this.index + 2] << 16 | data[this.index + 3] << 24;
+  this.index = this.index + 4;
+
+  // Fetch the id of the request that triggered the response
+  this.responseTo = data[this.index] | data[this.index + 1] << 8 | data[this.index + 2] << 16 | data[this.index + 3] << 24;
+  this.index = this.index + 4;
+
+  // Skip op-code field
+  this.index = this.index + 4;
+
+  // Unpack flags
+  this.responseFlags = data[this.index] | data[this.index + 1] << 8 | data[this.index + 2] << 16 | data[this.index + 3] << 24;
+  this.index = this.index + 4;
+
+  // Unpack the cursor
+  var lowBits = data[this.index] | data[this.index + 1] << 8 | data[this.index + 2] << 16 | data[this.index + 3] << 24;
+  this.index = this.index + 4;
+  var highBits = data[this.index] | data[this.index + 1] << 8 | data[this.index + 2] << 16 | data[this.index + 3] << 24;
+  this.index = this.index + 4;
+  // Create long object
+  this.cursorId = new Long(lowBits, highBits);
+
+  // Unpack the starting from
+  this.startingFrom = data[this.index] | data[this.index + 1] << 8 | data[this.index + 2] << 16 | data[this.index + 3] << 24;
+  this.index = this.index + 4;
+
+  // Unpack the number of objects returned
+  this.numberReturned = data[this.index] | data[this.index + 1] << 8 | data[this.index + 2] << 16 | data[this.index + 3] << 24;
+  this.index = this.index + 4;
+
+  // Preallocate document array
+  this.documents = new Array(this.numberReturned);
+
+  // Flag values
+  this.cursorNotFound = (this.responseFlags & CURSOR_NOT_FOUND) != 0;
+  this.queryFailure = (this.responseFlags & QUERY_FAILURE) != 0;
+  this.shardConfigStale = (this.responseFlags & SHARD_CONFIG_STALE) != 0;
+  this.awaitCapable = (this.responseFlags & AWAIT_CAPABLE) != 0;
+  this.promoteLongs = typeof opts.promoteLongs == 'boolean' ? opts.promoteLongs : true;
+}
+
+Response.prototype.isParsed = function() {
+  return this.parsed;
+}
+
+// Validation buffers
+var firstBatch = new Buffer('firstBatch', 'utf8');
+var nextBatch = new Buffer('nextBatch', 'utf8');
+var cursorId = new Buffer('id', 'utf8').toString('hex');
+
+var documentBuffers = {
+  firstBatch: firstBatch.toString('hex'),
+  nextBatch: nextBatch.toString('hex')
+};
+
+Response.prototype.parse = function(options) {
+  // Don't parse again if not needed
+  if(this.parsed) return;
+  options = options || {};
+
+  // Allow the return of raw documents instead of parsing
+  var raw = options.raw || false;
+  var documentsReturnedIn = options.documentsReturnedIn || null;
+
+  //
+  // Single document and documentsReturnedIn set
+  //
+  if(this.numberReturned == 1 && documentsReturnedIn != null && raw) {
+    // Calculate the bson size
+    var bsonSize = this.data[this.index] | this.data[this.index + 1] << 8 | this.data[this.index + 2] << 16 | this.data[this.index + 3] << 24;
+    // Slice out the buffer containing the command result document
+    var document = this.data.slice(this.index, this.index + bsonSize);
+    // Set up field we wish to keep as raw
+    var fieldsAsRaw = {}
+    fieldsAsRaw[documentsReturnedIn] = true;
+    // Set up the options
+    var _options = {promoteLongs: this.opts.promoteLongs, fieldsAsRaw: fieldsAsRaw};
+
+    // Deserialize but keep the array of documents in non-parsed form
+    var doc = this.bson.deserialize(document, _options);
+
+    // Get the documents
+    this.documents = doc.cursor[documentsReturnedIn];
+    this.numberReturned = this.documents.length;
+    // Ensure we have a Long valie cursor id
+    this.cursorId = typeof doc.cursor.id == 'number'
+      ? Long.fromNumber(doc.cursor.id)
+      : doc.cursor.id;
+
+    // Adjust the index
+    this.index = this.index + bsonSize;
+
+    // Set as parsed
+    this.parsed = true
+    return;
+  }
+
+  //
+  // Parse Body
+  //
+  for(var i = 0; i < this.numberReturned; i++) {
+    var bsonSize = this.data[this.index] | this.data[this.index + 1] << 8 | this.data[this.index + 2] << 16 | this.data[this.index + 3] << 24;
+    // Parse options
+    var _options = {promoteLongs: this.opts.promoteLongs};
+
+    // If we have raw results specified slice the return document
+    if(raw) {
+      this.documents[i] = this.data.slice(this.index, this.index + bsonSize);
+    } else {
+      this.documents[i] = this.bson.deserialize(this.data.slice(this.index, this.index + bsonSize), _options);
+    }
+
+    // Adjust the index
+    this.index = this.index + bsonSize;
+  }
+
+  // Set parsed
+  this.parsed = true;
+}
+
+module.exports = {
+    Query: Query
+  , GetMore: GetMore
+  , Response: Response
+  , KillCursor: KillCursor
+}
diff --git a/node_modules/mongodb-core/lib/connection/connection.js b/node_modules/mongodb-core/lib/connection/connection.js
new file mode 100644
index 0000000..b44c4e0
--- /dev/null
+++ b/node_modules/mongodb-core/lib/connection/connection.js
@@ -0,0 +1,531 @@
+"use strict";
+
+var inherits = require('util').inherits
+  , EventEmitter = require('events').EventEmitter
+  , net = require('net')
+  , tls = require('tls')
+  , f = require('util').format
+  , debugOptions = require('./utils').debugOptions
+  , Response = require('./commands').Response
+  , MongoError = require('../error')
+  , Logger = require('./logger');
+
+var _id = 0;
+var debugFields = ['host', 'port', 'size', 'keepAlive', 'keepAliveInitialDelay', 'noDelay'
+  , 'connectionTimeout', 'socketTimeout', 'singleBufferSerializtion', 'ssl', 'ca', 'cert'
+  , 'rejectUnauthorized', 'promoteLongs', 'checkServerIdentity'];
+var connectionAccounting = false;
+var connections = {};
+
+/**
+ * Creates a new Connection instance
+ * @class
+ * @param {string} options.host The server host
+ * @param {number} options.port The server port
+ * @param {boolean} [options.keepAlive=true] TCP Connection keep alive enabled
+ * @param {number} [options.keepAliveInitialDelay=0] Initial delay before TCP keep alive enabled
+ * @param {boolean} [options.noDelay=true] TCP Connection no delay
+ * @param {number} [options.connectionTimeout=0] TCP Connection timeout setting
+ * @param {number} [options.socketTimeout=0] TCP Socket timeout setting
+ * @param {boolean} [options.singleBufferSerializtion=true] Serialize into single buffer, trade of peak memory for serialization speed
+ * @param {boolean} [options.ssl=false] Use SSL for connection
+ * @param {boolean|function} [options.checkServerIdentity=true] Ensure we check server identify during SSL, set to false to disable checking. Only works for Node 0.12.x or higher. You can pass in a boolean or your own checkServerIdentity override function.
+ * @param {Buffer} [options.ca] SSL Certificate store binary buffer
+ * @param {Buffer} [options.cert] SSL Certificate binary buffer
+ * @param {Buffer} [options.key] SSL Key file binary buffer
+ * @param {string} [options.passphrase] SSL Certificate pass phrase
+ * @param {boolean} [options.rejectUnauthorized=true] Reject unauthorized server certificates
+ * @param {boolean} [options.promoteLongs=true] Convert Long values from the db into Numbers if they fit into 53 bits
+ * @fires Connection#connect
+ * @fires Connection#close
+ * @fires Connection#error
+ * @fires Connection#timeout
+ * @fires Connection#parseError
+ * @return {Connection} A cursor instance
+ */
+var Connection = function(messageHandler, options) {
+  // Add event listener
+  EventEmitter.call(this);
+  // Set empty if no options passed
+  this.options = options || {};
+  // Identification information
+  this.id = _id++;
+  // Logger instance
+  this.logger = Logger('Connection', options);
+  // No bson parser passed in
+  if(!options.bson) throw new Error("must pass in valid bson parser");
+  // Get bson parser
+  this.bson = options.bson;
+  // Grouping tag used for debugging purposes
+  this.tag = options.tag;
+  // Message handler
+  this.messageHandler = messageHandler;
+
+  // Max BSON message size
+  this.maxBsonMessageSize = options.maxBsonMessageSize || (1024 * 1024 * 16 * 4);
+  // Debug information
+  if(this.logger.isDebug()) this.logger.debug(f('creating connection %s with options [%s]', this.id, JSON.stringify(debugOptions(debugFields, options))));
+
+  // Default options
+  this.port = options.port || 27017;
+  this.host = options.host || 'localhost';
+  this.keepAlive = typeof options.keepAlive == 'boolean' ? options.keepAlive : true;
+  this.keepAliveInitialDelay = options.keepAliveInitialDelay || 0;
+  this.noDelay = typeof options.noDelay == 'boolean' ? options.noDelay : true;
+  this.connectionTimeout = options.connectionTimeout || 0;
+  this.socketTimeout = options.socketTimeout || 0;
+
+  // If connection was destroyed
+  this.destroyed = false;
+
+  // Check if we have a domain socket
+  this.domainSocket = this.host.indexOf('\/') != -1;
+
+  // Serialize commands using function
+  this.singleBufferSerializtion = typeof options.singleBufferSerializtion == 'boolean' ? options.singleBufferSerializtion : true;
+  this.serializationFunction = this.singleBufferSerializtion ? 'toBinUnified' : 'toBin';
+
+  // SSL options
+  this.ca = options.ca || null;
+  this.cert = options.cert || null;
+  this.key = options.key || null;
+  this.passphrase = options.passphrase || null;
+  this.ssl = typeof options.ssl == 'boolean' ? options.ssl : false;
+  this.rejectUnauthorized = typeof options.rejectUnauthorized == 'boolean' ? options.rejectUnauthorized : true;
+  this.checkServerIdentity = typeof options.checkServerIdentity == 'boolean'
+    || typeof options.checkServerIdentity == 'function' ? options.checkServerIdentity : true;
+
+  // If ssl not enabled
+  if(!this.ssl) this.rejectUnauthorized = false;
+
+  // Response options
+  this.responseOptions = {
+    promoteLongs: typeof options.promoteLongs == 'boolean' ?  options.promoteLongs : true
+  }
+
+  // Flushing
+  this.flushing = false;
+  this.queue = [];
+
+  // Internal state
+  this.connection = null;
+  this.writeStream = null;
+}
+
+inherits(Connection, EventEmitter);
+
+Connection.prototype.setSocketTimeout = function(value) {
+  if(this.connection) {
+    this.connection.setTimeout(value);
+  }
+}
+
+Connection.prototype.resetSocketTimeout = function(value) {
+  if(this.connection) {
+    this.connection.setTimeout(this.socketTimeout);;
+  }
+}
+
+Connection.enableConnectionAccounting = function() {
+  connectionAccounting = true;
+  connections = {};
+}
+
+Connection.disableConnectionAccounting = function() {
+  connectionAccounting = false;
+}
+
+Connection.connections = function() {
+  return connections;
+}
+
+//
+// Connection handlers
+var errorHandler = function(self) {
+  return function(err) {
+    if(connectionAccounting) delete connections[self.id];
+    // Debug information
+    if(self.logger.isDebug()) self.logger.debug(f('connection %s for [%s:%s] errored out with [%s]', self.id, self.host, self.port, JSON.stringify(err)));
+    // Emit the error
+    if(self.listeners('error').length > 0) self.emit("error", MongoError.create(err), self);
+  }
+}
+
+var timeoutHandler = function(self) {
+  return function(err) {
+    if(connectionAccounting) delete connections[self.id];
+    // Debug information
+    if(self.logger.isDebug()) self.logger.debug(f('connection %s for [%s:%s] timed out', self.id, self.host, self.port));
+    // Emit timeout error
+    self.emit("timeout"
+      , MongoError.create(f("connection %s to %s:%s timed out", self.id, self.host, self.port))
+      , self);
+  }
+}
+
+var closeHandler = function(self) {
+  return function(hadError) {
+    if(connectionAccounting) delete connections[self.id];
+    // Debug information
+    if(self.logger.isDebug()) self.logger.debug(f('connection %s with for [%s:%s] closed', self.id, self.host, self.port));
+
+    // Emit close event
+    if(!hadError) {
+      self.emit("close"
+        , MongoError.create(f("connection %s to %s:%s closed", self.id, self.host, self.port))
+        , self);
+    }
+  }
+}
+
+var dataHandler = function(self) {
+  return function(data) {
+    // 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 {
+            var emitBuffer = self.buffer;
+            // Reset state of buffer
+            self.buffer = null;
+            self.sizeOfMessage = 0;
+            self.bytesRead = 0;
+            self.stubBuffer = null;
+            // Emit the buffer
+            self.messageHandler(new Response(self.bson, emitBuffer, self.responseOptions), self);
+          } catch(err) {
+            var errorObject = {err:"socketHandler", trace:err, bin:self.buffer, parseState:{
+              sizeOfMessage:self.sizeOfMessage,
+              bytesRead:self.bytesRead,
+              stubBuffer:self.stubBuffer}};
+            // We got a parse Error fire it off then keep going
+            self.emit("parseError", errorObject, self);
+          }
+        }
+      } 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 = data.readUInt32LE(0);
+            var sizeOfMessage = data[0] | data[1] << 8 | data[2] << 16 | data[3] << 24;
+            // If we have a negative sizeOfMessage emit error and return
+            if(sizeOfMessage < 0 || sizeOfMessage > self.maxBsonMessageSize) {
+              var errorObject = {err:"socketHandler", trace:'', bin:self.buffer, parseState:{
+                sizeOfMessage: sizeOfMessage,
+                bytesRead: self.bytesRead,
+                stubBuffer: self.stubBuffer}};
+              // We got a parse Error fire it off then keep going
+              self.emit("parseError", errorObject, self);
+              return;
+            }
+
+            // Ensure that the size of message is larger than 0 and less than the max allowed
+            if(sizeOfMessage > 4 && sizeOfMessage < self.maxBsonMessageSize && 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.maxBsonMessageSize && sizeOfMessage == data.length) {
+              try {
+                var emitBuffer = data;
+                // Reset state of buffer
+                self.buffer = null;
+                self.sizeOfMessage = 0;
+                self.bytesRead = 0;
+                self.stubBuffer = null;
+                // Exit parsing loop
+                data = new Buffer(0);
+                // Emit the message
+                self.messageHandler(new Response(self.bson, emitBuffer, self.responseOptions), self);
+              } catch (err) {
+                self.emit("parseError", err, self);
+              }
+            } else if(sizeOfMessage <= 4 || sizeOfMessage > self.maxBsonMessageSize) {
+              var errorObject = {err:"socketHandler", trace:null, bin:data, parseState:{
+                sizeOfMessage:sizeOfMessage,
+                bytesRead:0,
+                buffer:null,
+                stubBuffer:null}};
+              // 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 {
+              var emitBuffer = data.slice(0, sizeOfMessage);
+              // Reset state of buffer
+              self.buffer = null;
+              self.sizeOfMessage = 0;
+              self.bytesRead = 0;
+              self.stubBuffer = null;
+              // Copy rest of message
+              data = data.slice(sizeOfMessage);
+              // Emit the message
+              self.messageHandler(new Response(self.bson, emitBuffer, self.responseOptions), 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);
+          }
+        }
+      }
+    }
+  }
+}
+
+/**
+ * Connect
+ * @method
+ */
+Connection.prototype.connect = function(_options) {
+  var self = this;
+  _options = _options || {};
+  // Set the connections
+  if(connectionAccounting) connections[this.id] = this;
+  // Check if we are overriding the promoteLongs
+  if(typeof _options.promoteLongs == 'boolean') {
+    self.responseOptions.promoteLongs = _options.promoteLongs;
+  }
+
+  // Create new connection instance
+  self.connection = self.domainSocket
+    ? net.createConnection(self.host)
+    : net.createConnection(self.port, self.host);
+
+  // Set the options for the connection
+  self.connection.setKeepAlive(self.keepAlive, self.keepAliveInitialDelay);
+  self.connection.setTimeout(self.connectionTimeout);
+  self.connection.setNoDelay(self.noDelay);
+
+  // If we have ssl enabled
+  if(self.ssl) {
+    var sslOptions = {
+        socket: self.connection
+      , rejectUnauthorized: self.rejectUnauthorized
+    }
+
+    if(self.ca) sslOptions.ca = self.ca;
+    if(self.cert) sslOptions.cert = self.cert;
+    if(self.key) sslOptions.key = self.key;
+    if(self.passphrase) sslOptions.passphrase = self.passphrase;
+
+    // Override checkServerIdentity behavior
+    if(self.checkServerIdentity == false) {
+      // Skip the identiy check by retuning undefined as per node documents
+      // https://nodejs.org/api/tls.html#tls_tls_connect_options_callback
+      sslOptions.checkServerIdentity = function(servername, cert) {
+        return undefined;
+      }
+    } else if(typeof self.checkServerIdentity == 'function') {
+      sslOptions.checkServerIdentity = self.checkServerIdentity;
+    }
+
+    // Attempt SSL connection
+    self.connection = tls.connect(self.port, self.host, sslOptions, function() {
+      // Error on auth or skip
+      if(self.connection.authorizationError && self.rejectUnauthorized) {
+        return self.emit("error", self.connection.authorizationError, self, {ssl:true});
+      }
+
+      // Set socket timeout instead of connection timeout
+      self.connection.setTimeout(self.socketTimeout);
+      // We are done emit connect
+      self.emit('connect', self);
+    });
+    self.connection.setTimeout(self.connectionTimeout);
+  } else {
+    self.connection.on('connect', function() {
+      // Set socket timeout instead of connection timeout
+      self.connection.setTimeout(self.socketTimeout);
+      // Emit connect event
+      self.emit('connect', self);
+    });
+  }
+
+  // Add handlers for events
+  self.connection.once('error', errorHandler(self));
+  self.connection.once('timeout', timeoutHandler(self));
+  self.connection.once('close', closeHandler(self));
+  self.connection.on('data', dataHandler(self));
+}
+
+/**
+ * Unref this connection
+ * @method
+ * @return {boolean}
+ */
+Connection.prototype.unref = function() {
+  if (this.connection) this.connection.unref();
+  else {
+    var self = this;
+    this.once('connect', function() {
+      self.connection.unref();
+    });
+  }
+}
+
+/**
+ * Destroy connection
+ * @method
+ */
+Connection.prototype.destroy = function() {
+  // Set the connections
+  if(connectionAccounting) delete connections[this.id];
+  if(this.connection) {
+    this.connection.end();
+    this.connection.destroy();
+  }
+
+  this.destroyed = true;
+}
+
+/**
+ * Write to connection
+ * @method
+ * @param {Command} command Command to write out need to implement toBin and toBinUnified
+ */
+Connection.prototype.write = function(buffer) {
+  // Debug Log
+  if(this.logger.isDebug()) {
+    if(!Array.isArray(buffer)) {
+      this.logger.debug(f('writing buffer [%s] to %s:%s', buffer.toString('hex'), this.host, this.port));
+    } else {
+      for(var i = 0; i < buffer.length; i++)
+        this.logger.debug(f('writing buffer [%s] to %s:%s', buffer[i].toString('hex'), this.host, this.port));
+    }
+  }
+
+  // Write out the command
+  if(!Array.isArray(buffer)) return this.connection.write(buffer, 'binary');
+  // Iterate over all buffers and write them in order to the socket
+  for(var i = 0; i < buffer.length; i++) this.connection.write(buffer[i], 'binary');
+}
+
+/**
+ * Return id of connection as a string
+ * @method
+ * @return {string}
+ */
+Connection.prototype.toString = function() {
+  return "" + this.id;
+}
+
+/**
+ * Return json object of connection
+ * @method
+ * @return {object}
+ */
+Connection.prototype.toJSON = function() {
+  return {id: this.id, host: this.host, port: this.port};
+}
+
+/**
+ * Is the connection connected
+ * @method
+ * @return {boolean}
+ */
+Connection.prototype.isConnected = function() {
+  if(this.destroyed) return false;
+  return !this.connection.destroyed && this.connection.writable;
+}
+
+/**
+ * A server connect event, used to verify that the connection is up and running
+ *
+ * @event Connection#connect
+ * @type {Connection}
+ */
+
+/**
+ * The server connection closed, all pool connections closed
+ *
+ * @event Connection#close
+ * @type {Connection}
+ */
+
+/**
+ * The server connection caused an error, all pool connections closed
+ *
+ * @event Connection#error
+ * @type {Connection}
+ */
+
+/**
+ * The server connection timed out, all pool connections closed
+ *
+ * @event Connection#timeout
+ * @type {Connection}
+ */
+
+/**
+ * The driver experienced an invalid message, all pool connections closed
+ *
+ * @event Connection#parseError
+ * @type {Connection}
+ */
+
+module.exports = Connection;
diff --git a/node_modules/mongodb-core/lib/connection/logger.js b/node_modules/mongodb-core/lib/connection/logger.js
new file mode 100644
index 0000000..cba8954
--- /dev/null
+++ b/node_modules/mongodb-core/lib/connection/logger.js
@@ -0,0 +1,229 @@
+"use strict";
+
+var f = require('util').format
+  , MongoError = require('../error');
+
+// Filters for classes
+var classFilters = {};
+var filteredClasses = {};
+var level = null;
+// Save the process id
+var pid = process.pid;
+// current logger
+var currentLogger = null;
+
+/**
+ * Creates a new Logger instance
+ * @class
+ * @param {string} className The Class name associated with the logging instance
+ * @param {object} [options=null] Optional settings.
+ * @param {Function} [options.logger=null] Custom logger function;
+ * @param {string} [options.loggerLevel=error] Override default global log level.
+ * @return {Logger} a Logger instance.
+ */
+var Logger = function(className, options) {
+  if(!(this instanceof Logger)) return new Logger(className, options);
+  options = options || {};
+
+  // Current reference
+  var self = this;
+  this.className = className;
+
+  // Current logger
+  if(options.logger) {
+    currentLogger = options.logger;
+  } else if(currentLogger == null) {
+    currentLogger = console.log;
+  }
+
+  // Set level of logging, default is error
+  if(options.loggerLevel) {
+    level = options.loggerLevel || 'error';
+  }
+
+  // Add all class names
+  if(filteredClasses[this.className] == null) classFilters[this.className] =  true;
+}
+
+/**
+ * Log a message at the debug level
+ * @method
+ * @param {string} message The message to log
+ * @param {object} object additional meta data to log
+ * @return {null}
+ */
+Logger.prototype.debug = function(message, object) {
+  if(this.isDebug()
+    && ((Object.keys(filteredClasses).length > 0 && filteredClasses[this.className])
+      || (Object.keys(filteredClasses).length == 0 && classFilters[this.className]))) {
+    var dateTime = new Date().getTime();
+    var msg = f("[%s-%s:%s] %s %s", 'DEBUG', this.className, pid, dateTime, message);
+    var state = {
+      type: 'debug', message: message, className: this.className, pid: pid, date: dateTime
+    };
+    if(object) state.meta = object;
+    currentLogger(msg, state);
+  }
+}
+
+/**
+ * Log a message at the warn level
+ * @method
+ * @param {string} message The message to log
+ * @param {object} object additional meta data to log
+ * @return {null}
+ */
+Logger.prototype.warn = function(message, object) {
+  if(this.isWarn()
+    && ((Object.keys(filteredClasses).length > 0 && filteredClasses[this.className])
+      || (Object.keys(filteredClasses).length == 0 && classFilters[this.className]))) {
+    var dateTime = new Date().getTime();
+    var msg = f("[%s-%s:%s] %s %s", 'WARN', this.className, pid, dateTime, message);
+    var state = {
+      type: 'warn', message: message, className: this.className, pid: pid, date: dateTime
+    };
+    if(object) state.meta = object;
+    currentLogger(msg, state);
+  }
+},
+
+/**
+ * Log a message at the info level
+ * @method
+ * @param {string} message The message to log
+ * @param {object} object additional meta data to log
+ * @return {null}
+ */
+Logger.prototype.info = function(message, object) {
+  if(this.isInfo()
+    && ((Object.keys(filteredClasses).length > 0 && filteredClasses[this.className])
+      || (Object.keys(filteredClasses).length == 0 && classFilters[this.className]))) {
+    var dateTime = new Date().getTime();
+    var msg = f("[%s-%s:%s] %s %s", 'INFO', this.className, pid, dateTime, message);
+    var state = {
+      type: 'info', message: message, className: this.className, pid: pid, date: dateTime
+    };
+    if(object) state.meta = object;
+    currentLogger(msg, state);
+  }
+},
+
+/**
+ * Log a message at the error level
+ * @method
+ * @param {string} message The message to log
+ * @param {object} object additional meta data to log
+ * @return {null}
+ */
+Logger.prototype.error = function(message, object) {
+  if(this.isError()
+    && ((Object.keys(filteredClasses).length > 0 && filteredClasses[this.className])
+      || (Object.keys(filteredClasses).length == 0 && classFilters[this.className]))) {
+    var dateTime = new Date().getTime();
+    var msg = f("[%s-%s:%s] %s %s", 'ERROR', this.className, pid, dateTime, message);
+    var state = {
+      type: 'error', message: message, className: this.className, pid: pid, date: dateTime
+    };
+    if(object) state.meta = object;
+    currentLogger(msg, state);
+  }
+},
+
+/**
+ * Is the logger set at info level
+ * @method
+ * @return {boolean}
+ */
+Logger.prototype.isInfo = function() {
+  return level == 'info' || level == 'debug';
+},
+
+/**
+ * Is the logger set at error level
+ * @method
+ * @return {boolean}
+ */
+Logger.prototype.isError = function() {
+  return level == 'error' || level == 'info' || level == 'debug';
+},
+
+/**
+ * Is the logger set at error level
+ * @method
+ * @return {boolean}
+ */
+Logger.prototype.isWarn = function() {
+  return level == 'error' || level == 'warn' || level == 'info' || level == 'debug';
+},
+
+/**
+ * Is the logger set at debug level
+ * @method
+ * @return {boolean}
+ */
+Logger.prototype.isDebug = function() {
+  return level == 'debug';
+}
+
+/**
+ * Resets the logger to default settings, error and no filtered classes
+ * @method
+ * @return {null}
+ */
+Logger.reset = function() {
+  level = 'error';
+  filteredClasses = {};
+}
+
+/**
+ * Get the current logger function
+ * @method
+ * @return {function}
+ */
+Logger.currentLogger = function() {
+  return currentLogger;
+}
+
+/**
+ * Set the current logger function
+ * @method
+ * @param {function} logger Logger function.
+ * @return {null}
+ */
+Logger.setCurrentLogger = function(logger) {
+  if(typeof logger != 'function') throw new MongoError("current logger must be a function");
+  currentLogger = logger;
+}
+
+/**
+ * Set what classes to log.
+ * @method
+ * @param {string} type The type of filter (currently only class)
+ * @param {string[]} values The filters to apply
+ * @return {null}
+ */
+Logger.filter = function(type, values) {
+  if(type == 'class' && Array.isArray(values)) {
+    filteredClasses = {};
+
+    values.forEach(function(x) {
+      filteredClasses[x] = true;
+    });
+  }
+}
+
+/**
+ * Set the current log level
+ * @method
+ * @param {string} level Set current log level (debug, info, error)
+ * @return {null}
+ */
+Logger.setLevel = function(_level) {
+  if(_level != 'info' && _level != 'error' && _level != 'debug' && _level != 'warn') {
+    throw new Error(f("%s is an illegal logging level", _level));
+  }
+
+  level = _level;
+}
+
+module.exports = Logger;
diff --git a/node_modules/mongodb-core/lib/connection/pool.js b/node_modules/mongodb-core/lib/connection/pool.js
new file mode 100644
index 0000000..4f1c83b
--- /dev/null
+++ b/node_modules/mongodb-core/lib/connection/pool.js
@@ -0,0 +1,1122 @@
+"use strict";
+
+var inherits = require('util').inherits,
+  EventEmitter = require('events').EventEmitter,
+  Connection = require('./connection'),
+  MongoError = require('../error'),
+  Logger = require('./logger'),
+  f = require('util').format,
+  Query = require('./commands').Query,
+  CommandResult = require('./command_result'),
+  assign = require('../topologies/shared').assign;
+
+var MongoCR = require('../auth/mongocr')
+  , X509 = require('../auth/x509')
+  , Plain = require('../auth/plain')
+  , GSSAPI = require('../auth/gssapi')
+  , SSPI = require('../auth/sspi')
+  , ScramSHA1 = require('../auth/scram');
+
+var DISCONNECTED = 'disconnected';
+var CONNECTING = 'connecting';
+var CONNECTED = 'connected';
+var DESTROYING = 'destroying';
+var DESTROYED = 'destroyed';
+
+var _id = 0;
+
+/**
+ * Creates a new Pool instance
+ * @class
+ * @param {string} options.host The server host
+ * @param {number} options.port The server port
+ * @param {number} [options.size=1] Max server connection pool size
+ * @param {boolean} [options.reconnect=true] Server will attempt to reconnect on loss of connection
+ * @param {number} [options.reconnectTries=30] Server attempt to reconnect #times
+ * @param {number} [options.reconnectInterval=1000] Server will wait # milliseconds between retries
+ * @param {boolean} [options.keepAlive=true] TCP Connection keep alive enabled
+ * @param {number} [options.keepAliveInitialDelay=0] Initial delay before TCP keep alive enabled
+ * @param {boolean} [options.noDelay=true] TCP Connection no delay
+ * @param {number} [options.connectionTimeout=0] TCP Connection timeout setting
+ * @param {number} [options.socketTimeout=0] TCP Socket timeout setting
+ * @param {number} [options.monitoringSocketTimeout=30000] TCP Socket timeout setting for replicaset monitoring socket
+ * @param {boolean} [options.ssl=false] Use SSL for connection
+ * @param {boolean|function} [options.checkServerIdentity=true] Ensure we check server identify during SSL, set to false to disable checking. Only works for Node 0.12.x or higher. You can pass in a boolean or your own checkServerIdentity override function.
+ * @param {Buffer} [options.ca] SSL Certificate store binary buffer
+ * @param {Buffer} [options.cert] SSL Certificate binary buffer
+ * @param {Buffer} [options.key] SSL Key file binary buffer
+ * @param {string} [options.passPhrase] SSL Certificate pass phrase
+ * @param {boolean} [options.rejectUnauthorized=false] Reject unauthorized server certificates
+ * @param {boolean} [options.promoteLongs=true] Convert Long values from the db into Numbers if they fit into 53 bits
+ * @fires Pool#connect
+ * @fires Pool#close
+ * @fires Pool#error
+ * @fires Pool#timeout
+ * @fires Pool#parseError
+ * @return {Pool} A cursor instance
+ */
+var Pool = function(options) {
+  var self = this;
+  // Add event listener
+  EventEmitter.call(this);
+  // Add the options
+  this.options = assign({
+    // Host and port settings
+    host: 'localhost',
+    port: 27017,
+    // Pool default max size
+    size: 5,
+    // socket settings
+    connectionTimeout: 30000,
+    socketTimeout: 30000,
+    keepAlive: true,
+    keepAliveInitialDelay: 0,
+    noDelay: true,
+    // SSL Settings
+    ssl: false, checkServerIdentity: false,
+    ca: null, cert: null, key: null, passPhrase: null,
+    rejectUnauthorized: false,
+    promoteLongs: true,
+    // Reconnection options
+    reconnect: true,
+    reconnectInterval: 1000,
+    reconnectTries: 30
+  }, options);
+
+  // Identification information
+  this.id = _id++;
+  // Current reconnect retries
+  this.retriesLeft = this.options.reconnectTries;
+  this.reconnectId = null;
+  // No bson parser passed in
+  if(!options.bson || (options.bson
+    && (typeof options.bson.serialize != 'function' || typeof options.bson.deserialize != 'function'))) throw new Error("must pass in valid bson parser");
+  // Logger instance
+  this.logger = Logger('Pool', options);
+  // Pool state
+  this.state = DISCONNECTED;
+  // Connections
+  this.availableConnections = [];
+  this.inUseConnections = [];
+  this.connectingConnections = [];
+  // Currently executing
+  this.executing = false;
+  // Operation work queue
+  this.queue = [];
+
+  // All the authProviders
+  this.authProviders = options.authProviders || {
+      'mongocr': new MongoCR(options.bson), 'x509': new X509(options.bson)
+    , 'plain': new Plain(options.bson), 'gssapi': new GSSAPI(options.bson)
+    , 'sspi': new SSPI(options.bson), 'scram-sha-1': new ScramSHA1(options.bson)
+  }
+
+  // Are we currently authenticating
+  this.authenticating = false;
+  this.loggingout = false;
+  this.nonAuthenticatedConnections = [];
+  this.authenticatingTimestamp = null;
+  // Number of consecutive timeouts caught
+  this.numberOfConsecutiveTimeouts = 0;
+}
+
+inherits(Pool, EventEmitter);
+
+Object.defineProperty(Pool.prototype, 'size', {
+  enumerable:true,
+  get: function() { return this.options.size; }
+});
+
+Object.defineProperty(Pool.prototype, 'connectionTimeout', {
+  enumerable:true,
+  get: function() { return this.options.connectionTimeout; }
+});
+
+Object.defineProperty(Pool.prototype, 'socketTimeout', {
+  enumerable:true,
+  get: function() { return this.options.socketTimeout; }
+});
+
+function stateTransition(self, newState) {
+  var legalTransitions = {
+    'disconnected': [CONNECTING, DESTROYING, DISCONNECTED],
+    'connecting': [CONNECTING, DESTROYING, CONNECTED, DISCONNECTED],
+    'connected': [CONNECTED, DISCONNECTED, DESTROYING],
+    'destroying': [DESTROYING, DESTROYED],
+    'destroyed': [DESTROYED]
+  }
+
+  // Get current state
+  var legalStates = legalTransitions[self.state];
+  if(legalStates && legalStates.indexOf(newState) != -1) {
+    self.state = newState;
+  } else {
+    self.logger.error(f('Pool with id [%s] failed attempted illegal state transition from [%s] to [%s] only following state allowed [%s]'
+      , self.id, self.state, newState, legalStates));
+  }
+}
+
+function authenticate(pool, auth, connection, cb) {
+  if(auth[0] === undefined) return cb(null);
+  // We need to authenticate the server
+  var mechanism = auth[0];
+  var db = auth[1];
+  // Validate if the mechanism exists
+  if(!pool.authProviders[mechanism]) {
+    throw new MongoError(f('authMechanism %s not supported', mechanism));
+  }
+
+  // Get the provider
+  var provider = pool.authProviders[mechanism];
+
+  // Authenticate using the provided mechanism
+  provider.auth.apply(provider, [write(pool), [connection], db].concat(auth.slice(2)).concat([cb]));
+}
+
+// The write function used by the authentication mechanism (bypasses external)
+function write(self) {
+  return function(connection, buffer, callback) {
+    // Ensure we stop auth if pool was destroyed
+    if(self.state == DESTROYED || self.state == DESTROYING) {
+      return callback(new MongoError('pool destroyed'));
+    }
+    // Set the connection workItem callback
+    connection.workItem = {cb: callback, command: true};
+    // Write the buffer out to the connection
+    connection.write(buffer);
+  };
+}
+
+
+function reauthenticate(pool, connection, cb) {
+  // Authenticate
+  function authenticateAgainstProvider(pool, connection, providers, cb) {
+    // Finished re-authenticating against providers
+    if(providers.length == 0) return cb();
+    // Get the provider name
+    var provider = pool.authProviders[providers.pop()];
+
+    // Auth provider
+    provider.reauthenticate(write(pool), [connection], function(err, r) {
+      // We got an error return immediately
+      if(err) return cb(err);
+      // Continue authenticating the connection
+      authenticateAgainstProvider(pool, connection, providers, cb);
+    });
+  }
+
+  // Start re-authenticating process
+  authenticateAgainstProvider(pool, connection, Object.keys(pool.authProviders), cb);
+}
+
+function connectionFailureHandler(self, event) {
+  return function(err) {
+    removeConnection(self, this);
+
+    // Flush out the callback if there is one
+    if(this.workItem && this.workItem.cb) {
+      var workItem = this.workItem;
+      this.workItem = null;
+      workItem.cb(err);
+    }
+
+    // Did we catch a timeout, increment the numberOfConsecutiveTimeouts
+    if(event == 'timeout') {
+      self.numberOfConsecutiveTimeouts = self.numberOfConsecutiveTimeouts + 1;
+
+      // Have we timed out more than reconnectTries in a row ?
+      // Force close the pool as we are trying to connect to tcp sink hole
+      if(self.numberOfConsecutiveTimeouts > self.options.reconnectTries) {
+        self.numberOfConsecutiveTimeouts = 0;
+        // Destroy all connections and pool
+        self.destroy(true);
+        // Emit close event
+        return self.emit('close', self);
+      }
+    }
+
+    // No more socket available propegate the event
+    if(self.socketCount() == 0) {
+      if(self.state != DESTROYED && self.state != DESTROYING) {
+        stateTransition(self, DISCONNECTED);
+      }
+
+      // Do not emit error events, they are always close events
+      // do not trigger the low level error handler in node
+      event = event == 'error' ? 'close' : event;
+      self.emit(event, err);
+    }
+
+    // Start reconnection attempts
+    if(!self.reconnectId && self.options.reconnect) {
+      self.reconnectId = setTimeout(attemptReconnect(self), self.options.reconnectInterval);
+    }
+  };
+}
+
+function attemptReconnect(self) {
+  return function() {
+    self.emit('attemptReconnect', self);
+    if(self.state == DESTROYED || self.state == DESTROYING) return;
+
+    // We are connected do not try again
+    if(self.isConnected()) {
+      self.reconnectId = null;
+      return;
+    }
+
+    // If we have failure schedule a retry
+    function _connectionFailureHandler(self, event) {
+      return function() {
+        self.retriesLeft = self.retriesLeft - 1;
+        // How many retries are left
+        if(self.retriesLeft == 0) {
+          // Destroy the instance
+          self.destroy();
+          // Emit close event
+          self.emit('reconnectFailed'
+            , new MongoError(f('failed to reconnect after %s attempts with interval %s ms', self.options.reconnectTries, self.options.reconnectInterval)));
+        } else {
+          self.reconnectId = setTimeout(attemptReconnect(self), self.options.reconnectInterval);
+        }
+      }
+    }
+
+    // Got a connect handler
+    function _connectHandler(self) {
+      return function() {
+        // Assign
+        var connection = this;
+
+        // Pool destroyed stop the connection
+        if(self.state == DESTROYED || self.state == DESTROYING) {
+          return connection.destroy();
+        }
+
+        // Clear out all handlers
+        handlers.forEach(function(event) {
+          connection.removeAllListeners(event);
+        });
+
+        // Reset reconnect id
+        self.reconnectId = null;
+
+        // Apply pool connection handlers
+        connection.on('error', connectionFailureHandler(self, 'error'));
+        connection.on('close', connectionFailureHandler(self, 'close'));
+        connection.on('timeout', connectionFailureHandler(self, 'timeout'));
+        connection.on('parseError', connectionFailureHandler(self, 'parseError'));
+
+        // Apply any auth to the connection
+        reauthenticate(self, this, function(err) {
+          // Reset retries
+          self.retriesLeft = self.options.reconnectTries;
+          // Push to available connections
+          self.availableConnections.push(connection);
+          // Emit reconnect event
+          self.emit('reconnect', self);
+          // Trigger execute to start everything up again
+          _execute(self)();
+        });
+      }
+    }
+
+    // Create a connection
+    var connection = new Connection(messageHandler(self), self.options);
+    // Add handlers
+    connection.on('close', _connectionFailureHandler(self, 'close'));
+    connection.on('error', _connectionFailureHandler(self, 'error'));
+    connection.on('timeout', _connectionFailureHandler(self, 'timeout'));
+    connection.on('parseError', _connectionFailureHandler(self, 'parseError'));
+    // On connection
+    connection.on('connect', _connectHandler(self));
+    // Attempt connection
+    connection.connect();
+  }
+}
+
+function moveConnectionBetween(connection, from, to) {
+  var index = from.indexOf(connection);
+  // Move the connection from connecting to available
+  if(index != -1) {
+    from.splice(index, 1);
+    to.push(connection);
+  }
+}
+
+function messageHandler(self) {
+  return function(message, connection) {
+    // Get the callback
+    var workItem = connection.workItem;
+    // Reset timeout counter
+    self.numberOfConsecutiveTimeouts = 0;
+
+    // Reset the connection timeout if we modified it for
+    // this operation
+    if(workItem.socketTimeout) {
+      connection.resetSocketTimeout();
+    }
+
+    // Log if debug enabled
+    if(self.logger.isDebug()) {
+      self.logger.debug(f('message [%s] received from %s:%s'
+        , message.raw.toString('hex'), self.options.host, self.options.port));
+    }
+
+    // Authenticate any straggler connections
+    function authenticateStragglers(self, connection, callback) {
+      // Get any non authenticated connections
+      var connections = self.nonAuthenticatedConnections.slice(0);
+      var nonAuthenticatedConnections = self.nonAuthenticatedConnections;
+      self.nonAuthenticatedConnections = [];
+
+      // Establish if the connection need to be authenticated
+      // Add to authentication list if
+      // 1. we were in an authentication process when the operation was executed
+      // 2. our current authentication timestamp is from the workItem one, meaning an auth has happened
+      if(connection.workItem.authenticating == true
+        || (typeof connection.workItem.authenticatingTimestamp == 'number'
+            && connection.workItem.authenticatingTimestamp != self.authenticatingTimestamp)) {
+        // Add connection to the list
+        connections.push(connection);
+      }
+
+      // Clear out workItem
+      connection.workItem = null;
+
+      // No connections need to be re-authenticated
+      if(connections.length == 0) {
+        // Release the connection back to the pool
+        moveConnectionBetween(connection, self.inUseConnections, self.availableConnections);
+        // Finish
+        return callback();
+      }
+
+      // Apply re-authentication to all connections before releasing back to pool
+      var connectionCount = connections.length;
+      // Authenticate all connections
+      for(var i = 0; i < connectionCount; i++) {
+        reauthenticate(self, connections[i], function(err) {
+          connectionCount = connectionCount - 1;
+
+          if(connectionCount == 0) {
+            // Put non authenticated connections in available connections
+            self.availableConnections = self.availableConnections.concat(nonAuthenticatedConnections);
+            // Release the connection back to the pool
+            moveConnectionBetween(connection, self.inUseConnections, self.availableConnections);
+            // Return
+            callback();
+          }
+        });
+      }
+    }
+
+    authenticateStragglers(self, connection, function(err) {
+      // Keep executing, ensure current message handler does not stop execution
+      process.nextTick(function() {
+        _execute(self)();
+      });
+
+      // Time to dispatch the message if we have a callback
+      if(!workItem.immediateRelease) {
+        try {
+          // Parse the message according to the provided options
+          message.parse(workItem);
+        } catch(err) {
+          return workItem.cb(MongoError.create(err));
+        }
+
+        // Establish if we have an error
+        if(workItem.command && message.documents[0] && (message.documents[0].ok == 0 || message.documents[0]['$err']
+        || message.documents[0]['errmsg'] || message.documents[0]['code'])) {
+          return workItem.cb(MongoError.create(message.documents[0]));
+        }
+
+        // Return the documents
+        workItem.cb(null, new CommandResult(message.documents[0], connection, message));
+      }
+    });
+  }
+}
+
+/**
+ * Return the total socket count in the pool.
+ * @method
+ * @return {Number} The number of socket available.
+ */
+Pool.prototype.socketCount = function() {
+  return this.availableConnections.length
+    + this.inUseConnections.length
+    + this.connectingConnections.length;
+}
+
+/**
+ * Return all pool connections
+ * @method
+ * @return {Connectio[]} The pool connections
+ */
+Pool.prototype.allConnections = function() {
+  return this.availableConnections
+    .concat(this.inUseConnections)
+    .concat(this.connectingConnections);
+}
+
+/**
+ * Get a pool connection (round-robin)
+ * @method
+ * @return {Connection}
+ */
+Pool.prototype.get = function() {
+  return this.allConnections()[0];
+}
+
+/**
+ * Is the pool connected
+ * @method
+ * @return {boolean}
+ */
+Pool.prototype.isConnected = function() {
+  // We are in a destroyed state
+  if(this.state == DESTROYED || this.state == DESTROYING) {
+    return false;
+  }
+
+  // Get connections
+  var connections = this.availableConnections
+    .concat(this.inUseConnections)
+    .concat(this.connectingConnections);
+  for(var i = 0; i < connections.length; i++) {
+    if(connections[i].isConnected()) return true;
+  }
+
+  // Might be authenticating, but we are still connected
+  if(connections.length == 0 && this.authenticating) {
+    return true
+  }
+
+  // Not connected
+  return false;
+}
+
+/**
+ * Was the pool destroyed
+ * @method
+ * @return {boolean}
+ */
+Pool.prototype.isDestroyed = function() {
+  return this.state == DESTROYED || this.state == DESTROYING;
+}
+
+/**
+ * Is the pool in a disconnected state
+ * @method
+ * @return {boolean}
+ */
+Pool.prototype.isDisconnected = function() {
+  return this.state == DISCONNECTED;
+}
+
+/**
+ * Connect pool
+ * @method
+ */
+Pool.prototype.connect = function(auth) {
+  if(this.state != DISCONNECTED) throw new MongoError('connection in unlawful state ' + this.state);
+  var self = this;
+  // Transition to connecting state
+  stateTransition(this, CONNECTING);
+  // Create an array of the arguments
+  var args = Array.prototype.slice.call(arguments, 0);
+  // Create a connection
+  var connection = new Connection(messageHandler(self), this.options);
+  // Add to list of connections
+  this.connectingConnections.push(connection);
+  // Add listeners to the connection
+  connection.once('connect', function(connection) {
+    if(self.state == DESTROYED || self.state == DESTROYING) return self.destroy();
+
+    // Apply any store credentials
+    reauthenticate(self, connection, function(err) {
+      if(self.state == DESTROYED || self.state == DESTROYING) return self.destroy();
+
+      // We have an error emit it
+      if(err) {
+        // Destroy the pool
+        self.destroy();
+        // Emit the error
+        return self.emit('error', err);
+      }
+
+      // Authenticate
+      authenticate(self, args, connection, function(err) {
+        if(self.state == DESTROYED || self.state == DESTROYING) return self.destroy();
+
+        // We have an error emit it
+        if(err) {
+          // Destroy the pool
+          self.destroy();
+          // Emit the error
+          return self.emit('error', err);
+        }
+        // Set connected mode
+        stateTransition(self, CONNECTED);
+
+        // Move the active connection
+        moveConnectionBetween(connection, self.connectingConnections, self.availableConnections);
+
+        // Emit the connect event
+        self.emit('connect', self);
+      });
+    });
+  });
+
+  // Add error handlers
+  connection.once('error', connectionFailureHandler(this, 'error'));
+  connection.once('close', connectionFailureHandler(this, 'close'));
+  connection.once('timeout', connectionFailureHandler(this, 'timeout'));
+  connection.once('parseError', connectionFailureHandler(this, 'parseError'));
+
+  try {
+    connection.connect();
+  } catch(err) {
+    // SSL or something threw on connect
+    self.emit('error', err);
+  }
+}
+
+/**
+ * Authenticate using a specified mechanism
+ * @method
+ * @param {string} mechanism The Auth mechanism we are invoking
+ * @param {string} db The db we are invoking the mechanism against
+ * @param {...object} param Parameters for the specific mechanism
+ * @param {authResultCallback} callback A callback function
+ */
+Pool.prototype.auth = function(mechanism, db) {
+  var self = this;
+  var args = Array.prototype.slice.call(arguments, 0);
+  var callback = args.pop();
+  // If we are not connected don't allow additonal authentications to happen
+  // if(this.state != CONNECTED) throw new MongoError('connection in unlawful state ' + this.state);
+
+  // If we don't have the mechanism fail
+  if(self.authProviders[mechanism] == null && mechanism != 'default') {
+    throw new MongoError(f("auth provider %s does not exist", mechanism));
+  }
+
+  // Signal that we are authenticating a new set of credentials
+  this.authenticating = true;
+  this.authenticatingTimestamp = new Date().getTime();
+
+  // Authenticate all live connections
+  function authenticateLiveConnections(self, args, cb) {
+    // Get the current viable connections
+    var connections = self.availableConnections;
+    // Allow nothing else to use the connections while we authenticate them
+    self.availableConnections = [];
+
+    var connectionsCount = connections.length;
+    var error = null;
+    // No connections available, return
+    if(connectionsCount == 0) return callback(null);
+    // Authenticate the connections
+    for(var i = 0; i < connections.length; i++) {
+      authenticate(self, args, connections[i], function(err) {
+        connectionsCount = connectionsCount - 1;
+
+        // Store the error
+        if(err) error = err;
+
+        // Processed all connections
+        if(connectionsCount == 0) {
+          // Auth finished
+          self.authenticating = false;
+          // Add the connections back to available connections
+          self.availableConnections = self.availableConnections.concat(connections);
+          // We had an error, return it
+          if(error) {
+            // Log the error
+            if(self.logger.isError()) {
+              self.logger.error(f('[%s] failed to authenticate against server %s:%s'
+                , self.id, self.options.host, self.options.port));
+            }
+
+            return cb(error);
+          }
+          cb(null);
+        }
+      });
+    }
+  }
+
+  // Wait for a logout in process to happen
+  function waitForLogout(self, cb) {
+    if(!self.loggingout) return cb();
+    setTimeout(function() {
+      waitForLogout(self, cb);
+    }, 1)
+  }
+
+  // Wait for loggout to finish
+  waitForLogout(self, function() {
+    // Authenticate all live connections
+    authenticateLiveConnections(self, args, function(err) {
+      // Credentials correctly stored in auth provider if successful
+      // Any new connections will now reauthenticate correctly
+      self.authenticating = false;
+      // Return after authentication connections
+      callback(err);
+    });
+  });
+}
+
+/**
+ * Logout all users against a database
+ * @method
+ * @param {string} dbName The database name
+ * @param {authResultCallback} callback A callback function
+ */
+Pool.prototype.logout = function(dbName, callback) {
+  var self = this;
+  if(typeof dbName != 'string') throw new MongoError('logout method requires a db name as first argument');
+  if(typeof callback != 'function') throw new MongoError('logout method requires a callback');
+
+  // Indicate logout in process
+  this.loggingout = true;
+
+  // Get all relevant connections
+  var connections = self.availableConnections.concat(self.inUseConnections);
+  var count = connections.length;
+  // Store any error
+  var error = null;
+
+  // Send logout command over all the connections
+  for(var i = 0; i < connections.length; i++) {
+    var query = new Query(this.options.bson
+      , f('%s.$cmd', dbName)
+      , {logout:1}, {numberToSkip: 0, numberToReturn: 1});
+    write(self)(connections[i], query.toBin(), function(err, r) {
+      count = count - 1;
+      if(err) error = err;
+
+      if(count == 0) {
+        self.loggingout = false;
+        callback(error);
+      };
+    });
+  }
+}
+
+/**
+ * Unref the pool
+ * @method
+ */
+Pool.prototype.unref = function() {
+  // Get all the known connections
+  var connections = this.availableConnections
+    .concat(this.inUseConnections)
+    .concat(this.connectingConnections);
+  connections.forEach(function(c) {
+    c.unref();
+  });
+}
+
+// Events
+var events = ['error', 'close', 'timeout', 'parseError', 'connect'];
+
+// Destroy the connections
+function destroy(self, connections) {
+  // Destroy all connections
+  connections.forEach(function(c) {
+    // Remove all listeners
+    for(var i = 0; i < events.length; i++) {
+      c.removeAllListeners(events[i]);
+    }
+    // Destroy connection
+    c.destroy();
+  });
+
+  // Zero out all connections
+  self.inUseConnections = [];
+  self.availableConnections = [];
+  self.nonAuthenticatedConnections = [];
+  self.connectingConnections = [];
+
+  // Set state to destroyed
+  stateTransition(self, DESTROYED);
+}
+
+/**
+ * Destroy pool
+ * @method
+ */
+Pool.prototype.destroy = function(force) {
+  var self = this;
+  // Do not try again if the pool is already dead
+  if(this.state == DESTROYED || self.state == DESTROYING) return;
+  // Set state to destroyed
+  stateTransition(this, DESTROYING);
+
+  // Are we force closing
+  if(force) {
+    // Get all the known connections
+    var connections = self.availableConnections
+      .concat(self.inUseConnections)
+      .concat(self.nonAuthenticatedConnections)
+      .concat(self.connectingConnections);
+    return destroy(self, connections);
+  }
+
+  // Wait for the operations to drain before we close the pool
+  function checkStatus() {
+    if(self.queue.length == 0) {
+      // Get all the known connections
+      var connections = self.availableConnections
+        .concat(self.inUseConnections)
+        .concat(self.nonAuthenticatedConnections)
+        .concat(self.connectingConnections);
+
+      // Check if we have any in flight operations
+      for(var i = 0; i < connections.length; i++) {
+        // There is an operation still in flight, reschedule a
+        // check waiting for it to drain
+        if(connections[i].workItem) {
+          return setTimeout(checkStatus, 1);
+        }
+      }
+
+      destroy(self, connections);
+    } else {
+      setTimeout(checkStatus, 1);
+    }
+  }
+
+  // Initiate drain of operations
+  checkStatus();
+}
+
+/**
+ * Write a message to MongoDB
+ * @method
+ * @return {Connection}
+ */
+Pool.prototype.write = function(buffer, options, cb) {
+  // Ensure we have a callback
+  if(typeof options == 'function') {
+    cb = options;
+  }
+
+  // Always have options
+  options = options || {};
+
+  // Pool was destroyed error out
+  if(this.state == DESTROYED || this.state == DESTROYING) {
+    // Callback with an error
+    if(cb) cb(new MongoError('pool destroyed'));
+    return;
+  }
+
+  // Do we have an operation
+  var operation = {
+    buffer:buffer, cb: cb, raw: false, promoteLongs: true
+  };
+
+  // Set the options for the parsing
+  operation.promoteLongs = typeof options.promoteLongs == 'boolean' ? options.promoteLongs : true;
+  operation.raw = typeof options.raw == 'boolean' ? options.raw : false;
+  operation.immediateRelease = typeof options.immediateRelease == 'boolean' ? options.immediateRelease : false;
+  operation.documentsReturnedIn = options.documentsReturnedIn;
+  operation.command = typeof options.command == 'boolean' ? options.command : false;
+  // Optional per operation socketTimeout
+  operation.socketTimeout = options.socketTimeout;
+  operation.monitoring = options.monitoring;
+  // // debug
+  // operation.cmd = options.cmd;
+
+  // We need to have a callback function unless the message returns no response
+  if(!(typeof cb == 'function') && !options.noResponse) {
+    throw new MongoError('write method must provide a callback');
+  }
+
+  // If we have a monitoring operation schedule as the very first operation
+  // Otherwise add to back of queue
+  if(options.monitoring) {
+    this.queue.unshift(operation);
+  } else {
+    this.queue.push(operation);
+  }
+
+  // Attempt to execute the operation
+  _execute(this)();
+}
+
+// Remove connection method
+function remove(connection, connections) {
+  for(var i = 0; i < connections.length; i++) {
+    if(connections[i] === connection) {
+      connections.splice(i, 1);
+      return true;
+    }
+  }
+}
+
+function removeConnection(self, connection) {
+  if(remove(connection, self.availableConnections)) return;
+  if(remove(connection, self.inUseConnections)) return;
+  if(remove(connection, self.connectingConnections)) return;
+  if(remove(connection, self.nonAuthenticatedConnections)) return;
+}
+
+// All event handlers
+var handlers = ["close", "message", "error", "timeout", "parseError", "connect"];
+
+function _createConnection(self) {
+  var connection = new Connection(messageHandler(self), self.options);
+
+  // Push the connection
+  self.connectingConnections.push(connection);
+
+  // Handle any errors
+  var tempErrorHandler = function(_connection) {
+    return function(err) {
+      // Destroy the connection
+      _connection.destroy();
+      // Remove the connection from the connectingConnections list
+      removeConnection(self, _connection);
+      // Start reconnection attempts
+      if(!self.reconnectId && self.options.reconnect) {
+        self.reconnectId = setTimeout(attemptReconnect(self), self.options.reconnectInterval);
+      }
+    }
+  }
+
+  // Handle successful connection
+  var tempConnectHandler = function(_connection) {
+    return function() {
+      // Destroyed state return
+      if(self.state == DESTROYED || self.state == DESTROYING) {
+        // Remove the connection from the list
+        removeConnection(self, _connection);
+        return _connection.destroy();
+      }
+
+      // Destroy all event emitters
+      handlers.forEach(function(e) {
+        _connection.removeAllListeners(e);
+      });
+
+      // Add the final handlers
+      _connection.once('close', connectionFailureHandler(self, 'close'));
+      _connection.once('error', connectionFailureHandler(self, 'error'));
+      _connection.once('timeout', connectionFailureHandler(self, 'timeout'));
+      _connection.once('parseError', connectionFailureHandler(self, 'parseError'));
+
+      // Signal
+      reauthenticate(self, _connection, function(err) {
+        if(self.state == DESTROYED || self.state == DESTROYING) {
+          return _connection.destroy();
+        }
+        // Remove the connection from the connectingConnections list
+        removeConnection(self, _connection);
+
+        // Handle error
+        if(err) {
+          return _connection.destroy();
+        }
+
+        // If we are authenticating at the moment
+        // Do not automatially put in available connections
+        // As we need to apply the credentials first
+        if(self.authenticating) {
+          self.nonAuthenticatedConnections.push(_connection);
+        } else {
+          // Push to available
+          self.availableConnections.push(_connection);
+          // Execute any work waiting
+          _execute(self)();
+        }
+      });
+    }
+  }
+
+  // Add all handlers
+  connection.once('close', tempErrorHandler(connection));
+  connection.once('error', tempErrorHandler(connection));
+  connection.once('timeout', tempErrorHandler(connection));
+  connection.once('parseError', tempErrorHandler(connection));
+  connection.once('connect', tempConnectHandler(connection));
+
+  // Start connection
+  connection.connect();
+}
+
+function flushMonitoringOperations(queue) {
+  for(var i = 0; i < queue.length; i++) {
+    if(queue[i].monitoring) {
+      var workItem = queue[i];
+      queue.splice(i, 1);
+      workItem.cb(new MongoError('no connection available for monitoring'));
+    }
+  }
+}
+
+function _execute(self) {
+  return function() {
+    if(self.state == DESTROYED) return;
+    // Already executing, skip
+    if(self.executing) return;
+    // Set pool as executing
+    self.executing = true;
+
+    // Wait for auth to clear before continuing
+    function waitForAuth(cb) {
+      if(!self.authenticating) return cb();
+      // Wait for a milisecond and try again
+      setTimeout(function() {
+        waitForAuth(cb);
+      }, 1);
+    }
+
+    // Block on any auth in process
+    waitForAuth(function() {
+      // As long as we have available connections
+      while(true) {
+        // Total availble connections
+        var totalConnections = self.availableConnections.length
+          + self.connectingConnections.length
+          + self.inUseConnections.length;
+
+        // Have we not reached the max connection size yet
+        if(self.availableConnections.length == 0
+          && self.connectingConnections.length == 0
+          && totalConnections < self.options.size
+          && self.queue.length > 0) {
+          // // Flush any monitoring operations
+          // flushMonitoringOperations(self.queue);
+          // Create a new connection
+          _createConnection(self);
+          // Attempt to execute again
+          self.executing = false;
+          return;
+        }
+
+        // No available connections available, flush any monitoring ops
+        if(self.availableConnections.length == 0) {
+          // Flush any monitoring operations
+          flushMonitoringOperations(self.queue);
+          break;
+        }
+
+        // No queue break
+        if(self.queue.length == 0) {
+          break;
+        }
+
+        // Get a connection
+        var connection = self.availableConnections.pop();
+        if(connection.isConnected()) {
+          // Get the next work item
+          var workItem = self.queue.shift();
+
+          // Get actual binary commands
+          var buffer = workItem.buffer;
+
+          // Add connection to workers in flight
+          self.inUseConnections.push(connection);
+
+          // Set current status of authentication process
+          workItem.authenticating = self.authenticating;
+          workItem.authenticatingTimestamp = self.authenticatingTimestamp;
+
+          // Add current associated callback to the connection
+          connection.workItem = workItem
+
+          // We have a custom socketTimeout
+          if(!workItem.immediateRelease && typeof workItem.socketTimeout == 'number') {
+            connection.setSocketTimeout(workItem.socketTimeout);
+          }
+
+          // Put operation on the wire
+          if(Array.isArray(buffer)) {
+            for(var i = 0; i < buffer.length; i++) {
+              connection.write(buffer[i])
+            }
+          } else {
+            connection.write(buffer);
+          }
+
+          // Fire and forgot message, release the socket
+          if(workItem.immediateRelease && !self.authenticating) {
+            self.inUseConnections.pop();
+            self.availableConnections.push(connection);
+          } else if(workItem.immediateRelease && self.authenticating) {
+            self.inUseConnections.pop();
+            self.nonAuthenticatedConnections.push(connection);
+          }
+        } else {
+          flushMonitoringOperations(self.queue);
+        }
+      }
+    });
+
+    self.executing = false;
+  }
+}
+
+/**
+ * A server connect event, used to verify that the connection is up and running
+ *
+ * @event Pool#connect
+ * @type {Pool}
+ */
+
+/**
+ * A server reconnect event, used to verify that pool reconnected.
+ *
+ * @event Pool#reconnect
+ * @type {Pool}
+ */
+
+/**
+ * The server connection closed, all pool connections closed
+ *
+ * @event Pool#close
+ * @type {Pool}
+ */
+
+/**
+ * The server connection caused an error, all pool connections closed
+ *
+ * @event Pool#error
+ * @type {Pool}
+ */
+
+/**
+ * The server connection timed out, all pool connections closed
+ *
+ * @event Pool#timeout
+ * @type {Pool}
+ */
+
+/**
+ * The driver experienced an invalid message, all pool connections closed
+ *
+ * @event Pool#parseError
+ * @type {Pool}
+ */
+
+/**
+ * The driver attempted to reconnect
+ *
+ * @event Pool#attemptReconnect
+ * @type {Pool}
+ */
+
+/**
+ * The driver exhausted all reconnect attempts
+ *
+ * @event Pool#reconnectFailed
+ * @type {Pool}
+ */
+
+module.exports = Pool;
diff --git a/node_modules/mongodb-core/lib/connection/utils.js b/node_modules/mongodb-core/lib/connection/utils.js
new file mode 100644
index 0000000..019ef19
--- /dev/null
+++ b/node_modules/mongodb-core/lib/connection/utils.js
@@ -0,0 +1,67 @@
+"use strict";
+
+// Set property function
+var setProperty = function(obj, prop, flag, values) {
+  Object.defineProperty(obj, prop.name, {
+      enumerable:true,
+      set: function(value) {
+        if(typeof value != 'boolean') throw new Error(f("%s required a boolean", prop.name));
+        // Flip the bit to 1
+        if(value == true) values.flags |= flag;
+        // Flip the bit to 0 if it's set, otherwise ignore
+        if(value == false && (values.flags & flag) == flag) values.flags ^= flag;
+        prop.value = value;
+      }
+    , get: function() { return prop.value; }
+  });
+}
+
+// Set property function
+var getProperty = function(obj, propName, fieldName, values, func) {
+  Object.defineProperty(obj, propName, {
+    enumerable:true,
+    get: function() {
+      // Not parsed yet, parse it
+      if(values[fieldName] == null && obj.isParsed && !obj.isParsed()) {
+        obj.parse();
+      }
+
+      // Do we have a post processing function
+      if(typeof func == 'function') return func(values[fieldName]);
+      // Return raw value
+      return values[fieldName];
+    }
+  });
+}
+
+// Set simple property
+var getSingleProperty = function(obj, name, value) {
+  Object.defineProperty(obj, name, {
+    enumerable:true,
+    get: function() {
+      return value
+    }
+  });
+}
+
+// Shallow copy
+var copy = function(fObj, tObj) {
+  tObj = tObj || {};
+  for(var name in fObj) tObj[name] = fObj[name];
+  return tObj;
+}
+
+var debugOptions = function(debugFields, options) {
+  var finaloptions = {};
+  debugFields.forEach(function(n) {
+    finaloptions[n] = options[n];
+  });
+
+  return finaloptions;
+}
+
+exports.setProperty = setProperty;
+exports.getProperty = getProperty;
+exports.getSingleProperty = getSingleProperty;
+exports.copy = copy;
+exports.debugOptions = debugOptions;