diff options
Diffstat (limited to 'node_modules/mongodb/lib/mongodb/commands/delete_command.js')
| -rw-r--r-- | node_modules/mongodb/lib/mongodb/commands/delete_command.js | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/node_modules/mongodb/lib/mongodb/commands/delete_command.js b/node_modules/mongodb/lib/mongodb/commands/delete_command.js new file mode 100644 index 0000000..1adad07 --- /dev/null +++ b/node_modules/mongodb/lib/mongodb/commands/delete_command.js @@ -0,0 +1,111 @@ +var BaseCommand = require('./base_command').BaseCommand, + inherits = require('util').inherits; + +/** + Insert Document Command +**/ +var DeleteCommand = exports.DeleteCommand = function(db, collectionName, selector) { + BaseCommand.call(this); + + // Validate correctness off the selector + var object = selector; + 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("delete raw message size does not match message header size [" + object.length + "] != [" + object_size + "]"); + error.name = 'MongoError'; + throw error; + } + } + + this.collectionName = collectionName; + this.selector = selector; + this.db = db; +}; + +inherits(DeleteCommand, BaseCommand); + +DeleteCommand.OP_DELETE = 2006; + +/* +struct { + MsgHeader header; // standard message header + int32 ZERO; // 0 - reserved for future use + cstring fullCollectionName; // "dbname.collectionname" + int32 ZERO; // 0 - reserved for future use + mongo.BSON selector; // query object. See below for details. +} +*/ +DeleteCommand.prototype.toBinary = function() { + // Calculate total length of the document + var totalLengthOfCommand = 4 + Buffer.byteLength(this.collectionName) + 1 + 4 + this.db.bson.calculateObjectSize(this.selector, false, 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] = (DeleteCommand.OP_DELETE >> 24) & 0xff; + _command[_index + 2] = (DeleteCommand.OP_DELETE >> 16) & 0xff; + _command[_index + 1] = (DeleteCommand.OP_DELETE >> 8) & 0xff; + _command[_index] = DeleteCommand.OP_DELETE & 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 zero + _command[_index++] = 0; + _command[_index++] = 0; + _command[_index++] = 0; + _command[_index++] = 0; + + // Document binary length + var documentLength = 0 + + // Serialize the selector + // If we are passing a raw buffer, do minimal validation + if(Buffer.isBuffer(this.selector)) { + documentLength = this.selector.length; + // Copy the data into the current buffer + this.selector.copy(_command, _index); + } else { + documentLength = this.db.bson.serializeWithBufferAndIndex(this.selector, this.checkKeys, _command, _index) - _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; +};
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