var BaseCommand = require('./base_command').BaseCommand,
inherits = require('util').inherits;
/**
Update Document Command
**/
var UpdateCommand = exports.UpdateCommand = function(db, collectionName, spec, document, options) {
BaseCommand.call(this);
var object = spec;
if(Buffer.isBuffer(object)) {
var object_size = object[0] | object[1] << 8 | object[2] << 16 | object[3] << 24;
if(object_size != object.length) {
var error = new Error("update spec raw message size does not match message header size [" + object.length + "] != [" + object_size + "]");
error.name = 'MongoError';
throw error;
}
}
var object = document;
if(Buffer.isBuffer(object)) {
var object_size = object[0] | object[1] << 8 | object[2] << 16 | object[3] << 24;
if(object_size != object.length) {
var error = new Error("update document raw message size does not match message header size [" + object.length + "] != [" + object_size + "]");
error.name = 'MongoError';
throw error;
}
}
this.collectionName = collectionName;
this.spec = spec;
this.document = document;
this.db = db;
this.serializeFunctions = false;
// Generate correct flags
var db_upsert = 0;
var db_multi_update = 0;
db_upsert = options != null && options['upsert'] != null ? (options['upsert'] == true ? 1 : 0) : db_upsert;
db_multi_update = options != null && options['multi'] != null ? (options['multi'] == true ? 1 : 0) : db_multi_update;
// Flags
this.flags = parseInt(db_multi_update.toString() + db_upsert.toString(), 2);
// Let us defined on a command basis if we want functions to be serialized or not
if(options['serializeFunctions'] != null && options['serializeFunctions']) {
this.serializeFunctions = true;
}
};
inherits(UpdateCommand, BaseCommand);
UpdateCommand.OP_UPDATE = 2001;
/*
struct {
MsgHeader header; // standard message header
int32 ZERO; // 0 - reserved for future use
cstring fullCollectionName; // "dbname.collectionname"
int32 flags; // bit vector. see below
BSON spec; // the query to select the document
BSON document; // the document data to update with or insert
}
*/
UpdateCommand.prototype.toBinary = function() {
// Calculate total length of the document
var totalLengthOfCommand = 4 + Buffer.byteLength(this.collectionName) + 1 + 4 + this.db.bson.calculateObjectSize(this.spec, false, true) +
this.db.bson.calculateObjectSize(this.document, this.serializeFunctions, true) + (4 * 4);
// Let's build the single pass buffer command
var _index = 0;
var _command = new Buffer(totalLengthOfCommand);
// Write the header information to the buffer
_command[_index + 3] = (totalLengthOfCommand >> 24) & 0xff;
_command[_index + 2] = (totalLengthOfCommand >> 16) & 0xff;
_command[_index + 1] = (totalLengthOfCommand >> 8) & 0xff;
_command[_index] = totalLengthOfCommand & 0xff;
// Adjust index
_index = _index + 4;
// Write the request ID
_command[_index + 3] = (this.requestId >> 24) & 0xff;
_command[_index + 2] = (this.requestId >> 16) & 0xff;
_command[_index + 1] = (this.requestId >> 8) & 0xff;
_command[_index] = this.requestId & 0xff;
// Adjust index
_index = _index + 4;
// Write zero
_command[_index++] = 0;
_command[_index++] = 0;
_command[_index++] = 0;
_command[_index++] = 0;
// Write the op_code for the command
_command[_index + 3] = (UpdateCommand.OP_UPDATE >> 24) & 0xff;
_command[_index + 2] = (UpdateCommand.OP_UPDATE >> 16) & 0xff;
_command[_index + 1] = (UpdateCommand.OP_UPDATE >> 8) & 0xff;
_command[_index] = UpdateCommand.OP_UPDATE & 0xff;
// Adjust index
_index = _index + 4;
// Write zero
_command[_index++] = 0;
_command[_index++] = 0;
_command[_index++] = 0;
_command[_index++] = 0;
// Write the collection name to the command
_index = _index + _command.write(this.collectionName, _index, 'utf8') + 1;
_command[_index - 1] = 0;
// Write the update flags
_command[_index + 3] = (this.flags >> 24) & 0xff;
_command[_index + 2] = (this.flags >> 16) & 0xff;
_command[_index + 1] = (this.flags >> 8) & 0xff;
_command[_index] = this.flags & 0xff;
// Adjust index
_index = _index + 4;
// Document binary length
var documentLength = 0
var object = this.spec;
// Serialize the selector
// If we are passing a raw buffer, do minimal validation
if(Buffer.isBuffer(object)) {
var object_size = object[0] | object[1] << 8 | object[2] << 16 | object[3] << 24;
if(object_size != object.length) throw new Error("raw message size does not match message header size [" + object.length + "] != [" + object_size + "]");
documentLength = object.length;
// Copy the data into the current buffer
object.copy(_command, _index);
} else {
documentLength = this.db.bson.serializeWithBufferAndIndex(object, this.checkKeys, _command, _index, false) - _index + 1;
}
// Write the length to the document
_command[_index + 3] = (documentLength >> 24) & 0xff;
_command[_index + 2] = (documentLength >> 16) & 0xff;
_command[_index + 1] = (documentLength >> 8) & 0xff;
_command[_index] = documentLength & 0xff;
// Update index in buffer
_index = _index + documentLength;
// Add terminating 0 for the object
_command[_index - 1] = 0;
// Document binary length
var documentLength = 0
var object = this.document;
// Serialize the document
// If we are passing a raw buffer, do minimal validation
if(Buffer.isBuffer(object)) {
var object_size = object[0] | object[1] << 8 | object[2] << 16 | object[3] << 24;
if(object_size != object.length) throw new Error("raw message size does not match message header size [" + object.length + "] != [" + object_size + "]");
documentLength = object.length;
// Copy the data into the current buffer
object.copy(_command, _index);
} else {
documentLength = this.db.bson.serializeWithBufferAndIndex(object, this.checkKeys, _command, _index, this.serializeFunctions) - _index + 1;
}
// Write the length to the document
_command[_index + 3] = (documentLength >> 24) & 0xff;
_command[_index + 2] = (documentLength >> 16) & 0xff;
_command[_index + 1] = (documentLength >> 8) & 0xff;
_command[_index] = documentLength & 0xff;
// Update index in buffer
_index = _index + documentLength;
// Add terminating 0 for the object
_command[_index - 1] = 0;
return _command;
};
// Constants
UpdateCommand.DB_UPSERT = 0;
UpdateCommand.DB_MULTI_UPDATE = 1;