3 files changed, 0 insertions, 1330 deletions
diff --git a/node_modules/mongodb/lib/gridfs-stream/download.js b/node_modules/mongodb/lib/gridfs-stream/download.js
deleted file mode 100644
index 0aab5dc..0000000
--- a/node_modules/mongodb/lib/gridfs-stream/download.js
+++ /dev/null
@@ -1,433 +0,0 @@
-'use strict';
-
-var stream = require('stream'),
-  util = require('util');
-
-module.exports = GridFSBucketReadStream;
-
-/**
- * A readable stream that enables you to read buffers from GridFS.
- *
- * Do not instantiate this class directly. Use `openDownloadStream()` instead.
- *
- * @class
- * @extends external:Readable
- * @param {Collection} chunks Handle for chunks collection
- * @param {Collection} files Handle for files collection
- * @param {Object} readPreference The read preference to use
- * @param {Object} filter The query to use to find the file document
- * @param {Object} [options] Optional settings.
- * @param {Number} [options.sort] Optional sort for the file find query
- * @param {Number} [options.skip] Optional skip for the file find query
- * @param {Number} [options.start] Optional 0-based offset in bytes to start streaming from
- * @param {Number} [options.end] Optional 0-based offset in bytes to stop streaming before
- * @fires GridFSBucketReadStream#error
- * @fires GridFSBucketReadStream#file
- */
-function GridFSBucketReadStream(chunks, files, readPreference, filter, options) {
-  this.s = {
-    bytesRead: 0,
-    chunks: chunks,
-    cursor: null,
-    expected: 0,
-    files: files,
-    filter: filter,
-    init: false,
-    expectedEnd: 0,
-    file: null,
-    options: options,
-    readPreference: readPreference
-  };
-
-  stream.Readable.call(this);
-}
-
-util.inherits(GridFSBucketReadStream, stream.Readable);
-
-/**
- * An error occurred
- *
- * @event GridFSBucketReadStream#error
- * @type {Error}
- */
-
-/**
- * Fires when the stream loaded the file document corresponding to the
- * provided id.
- *
- * @event GridFSBucketReadStream#file
- * @type {object}
- */
-
-/**
- * Emitted when a chunk of data is available to be consumed.
- *
- * @event GridFSBucketReadStream#data
- * @type {object}
- */
-
-/**
- * Fired when the stream is exhausted (no more data events).
- *
- * @event GridFSBucketReadStream#end
- * @type {object}
- */
-
-/**
- * Fired when the stream is exhausted and the underlying cursor is killed
- *
- * @event GridFSBucketReadStream#close
- * @type {object}
- */
-
-/**
- * Reads from the cursor and pushes to the stream.
- * Private Impl, do not call directly
- * @ignore
- * @method
- */
-
-GridFSBucketReadStream.prototype._read = function() {
-  var _this = this;
-  if (this.destroyed) {
-    return;
-  }
-
-  waitForFile(_this, function() {
-    doRead(_this);
-  });
-};
-
-/**
- * Sets the 0-based offset in bytes to start streaming from. Throws
- * an error if this stream has entered flowing mode
- * (e.g. if you've already called `on('data')`)
- * @method
- * @param {Number} start Offset in bytes to start reading at
- * @return {GridFSBucketReadStream} Reference to Self
- */
-
-GridFSBucketReadStream.prototype.start = function(start) {
-  throwIfInitialized(this);
-  this.s.options.start = start;
-  return this;
-};
-
-/**
- * Sets the 0-based offset in bytes to start streaming from. Throws
- * an error if this stream has entered flowing mode
- * (e.g. if you've already called `on('data')`)
- * @method
- * @param {Number} end Offset in bytes to stop reading at
- * @return {GridFSBucketReadStream} Reference to self
- */
-
-GridFSBucketReadStream.prototype.end = function(end) {
-  throwIfInitialized(this);
-  this.s.options.end = end;
-  return this;
-};
-
-/**
- * Marks this stream as aborted (will never push another `data` event)
- * and kills the underlying cursor. Will emit the 'end' event, and then
- * the 'close' event once the cursor is successfully killed.
- *
- * @method
- * @param {GridFSBucket~errorCallback} [callback] called when the cursor is successfully closed or an error occurred.
- * @fires GridFSBucketWriteStream#close
- * @fires GridFSBucketWriteStream#end
- */
-
-GridFSBucketReadStream.prototype.abort = function(callback) {
-  var _this = this;
-  this.push(null);
-  this.destroyed = true;
-  if (this.s.cursor) {
-    this.s.cursor.close(function(error) {
-      _this.emit('close');
-      callback && callback(error);
-    });
-  } else {
-    if (!this.s.init) {
-      // If not initialized, fire close event because we will never
-      // get a cursor
-      _this.emit('close');
-    }
-    callback && callback();
-  }
-};
-
-/**
- * @ignore
- */
-
-function throwIfInitialized(self) {
-  if (self.s.init) {
-    throw new Error('You cannot change options after the stream has entered' + 'flowing mode!');
-  }
-}
-
-/**
- * @ignore
- */
-
-function doRead(_this) {
-  if (_this.destroyed) {
-    return;
-  }
-
-  _this.s.cursor.next(function(error, doc) {
-    if (_this.destroyed) {
-      return;
-    }
-    if (error) {
-      return __handleError(_this, error);
-    }
-    if (!doc) {
-      _this.push(null);
-
-      process.nextTick(() => {
-        _this.s.cursor.close(function(error) {
-          if (error) {
-            __handleError(_this, error);
-            return;
-          }
-
-          _this.emit('close');
-        });
-      });
-
-      return;
-    }
-
-    var bytesRemaining = _this.s.file.length - _this.s.bytesRead;
-    var expectedN = _this.s.expected++;
-    var expectedLength = Math.min(_this.s.file.chunkSize, bytesRemaining);
-
-    if (doc.n > expectedN) {
-      var errmsg = 'ChunkIsMissing: Got unexpected n: ' + doc.n + ', expected: ' + expectedN;
-      return __handleError(_this, new Error(errmsg));
-    }
-
-    if (doc.n < expectedN) {
-      errmsg = 'ExtraChunk: Got unexpected n: ' + doc.n + ', expected: ' + expectedN;
-      return __handleError(_this, new Error(errmsg));
-    }
-
-    var buf = Buffer.isBuffer(doc.data) ? doc.data : doc.data.buffer;
-
-    if (buf.length !== expectedLength) {
-      if (bytesRemaining <= 0) {
-        errmsg = 'ExtraChunk: Got unexpected n: ' + doc.n;
-        return __handleError(_this, new Error(errmsg));
-      }
-
-      errmsg =
-        'ChunkIsWrongSize: Got unexpected length: ' + buf.length + ', expected: ' + expectedLength;
-      return __handleError(_this, new Error(errmsg));
-    }
-
-    _this.s.bytesRead += buf.length;
-
-    if (buf.length === 0) {
-      return _this.push(null);
-    }
-
-    var sliceStart = null;
-    var sliceEnd = null;
-
-    if (_this.s.bytesToSkip != null) {
-      sliceStart = _this.s.bytesToSkip;
-      _this.s.bytesToSkip = 0;
-    }
-
-    const atEndOfStream = expectedN === _this.s.expectedEnd - 1;
-    const bytesLeftToRead = _this.s.options.end - _this.s.bytesToSkip;
-    if (atEndOfStream && _this.s.bytesToTrim != null) {
-      sliceEnd = _this.s.file.chunkSize - _this.s.bytesToTrim;
-    } else if (_this.s.options.end && bytesLeftToRead < doc.data.length()) {
-      sliceEnd = bytesLeftToRead;
-    }
-
-    if (sliceStart != null || sliceEnd != null) {
-      buf = buf.slice(sliceStart || 0, sliceEnd || buf.length);
-    }
-
-    _this.push(buf);
-  });
-}
-
-/**
- * @ignore
- */
-
-function init(self) {
-  var findOneOptions = {};
-  if (self.s.readPreference) {
-    findOneOptions.readPreference = self.s.readPreference;
-  }
-  if (self.s.options && self.s.options.sort) {
-    findOneOptions.sort = self.s.options.sort;
-  }
-  if (self.s.options && self.s.options.skip) {
-    findOneOptions.skip = self.s.options.skip;
-  }
-
-  self.s.files.findOne(self.s.filter, findOneOptions, function(error, doc) {
-    if (error) {
-      return __handleError(self, error);
-    }
-
-    if (!doc) {
-      var identifier = self.s.filter._id ? self.s.filter._id.toString() : self.s.filter.filename;
-      var errmsg = 'FileNotFound: file ' + identifier + ' was not found';
-      var err = new Error(errmsg);
-      err.code = 'ENOENT';
-      return __handleError(self, err);
-    }
-
-    // If document is empty, kill the stream immediately and don't
-    // execute any reads
-    if (doc.length <= 0) {
-      self.push(null);
-      return;
-    }
-
-    if (self.destroyed) {
-      // If user destroys the stream before we have a cursor, wait
-      // until the query is done to say we're 'closed' because we can't
-      // cancel a query.
-      self.emit('close');
-      return;
-    }
-
-    try {
-      self.s.bytesToSkip = handleStartOption(self, doc, self.s.options);
-    } catch (error) {
-      return __handleError(self, error);
-    }
-
-    var filter = { files_id: doc._id };
-
-    // Currently (MongoDB 3.4.4) skip function does not support the index,
-    // it needs to retrieve all the documents first and then skip them. (CS-25811)
-    // As work around we use $gte on the "n" field.
-    if (self.s.options && self.s.options.start != null) {
-      var skip = Math.floor(self.s.options.start / doc.chunkSize);
-      if (skip > 0) {
-        filter['n'] = { $gte: skip };
-      }
-    }
-    self.s.cursor = self.s.chunks.find(filter).sort({ n: 1 });
-
-    if (self.s.readPreference) {
-      self.s.cursor.setReadPreference(self.s.readPreference);
-    }
-
-    self.s.expectedEnd = Math.ceil(doc.length / doc.chunkSize);
-    self.s.file = doc;
-
-    try {
-      self.s.bytesToTrim = handleEndOption(self, doc, self.s.cursor, self.s.options);
-    } catch (error) {
-      return __handleError(self, error);
-    }
-
-    self.emit('file', doc);
-  });
-}
-
-/**
- * @ignore
- */
-
-function waitForFile(_this, callback) {
-  if (_this.s.file) {
-    return callback();
-  }
-
-  if (!_this.s.init) {
-    init(_this);
-    _this.s.init = true;
-  }
-
-  _this.once('file', function() {
-    callback();
-  });
-}
-
-/**
- * @ignore
- */
-
-function handleStartOption(stream, doc, options) {
-  if (options && options.start != null) {
-    if (options.start > doc.length) {
-      throw new Error(
-        'Stream start (' +
-          options.start +
-          ') must not be ' +
-          'more than the length of the file (' +
-          doc.length +
-          ')'
-      );
-    }
-    if (options.start < 0) {
-      throw new Error('Stream start (' + options.start + ') must not be ' + 'negative');
-    }
-    if (options.end != null && options.end < options.start) {
-      throw new Error(
-        'Stream start (' +
-          options.start +
-          ') must not be ' +
-          'greater than stream end (' +
-          options.end +
-          ')'
-      );
-    }
-
-    stream.s.bytesRead = Math.floor(options.start / doc.chunkSize) * doc.chunkSize;
-    stream.s.expected = Math.floor(options.start / doc.chunkSize);
-
-    return options.start - stream.s.bytesRead;
-  }
-}
-
-/**
- * @ignore
- */
-
-function handleEndOption(stream, doc, cursor, options) {
-  if (options && options.end != null) {
-    if (options.end > doc.length) {
-      throw new Error(
-        'Stream end (' +
-          options.end +
-          ') must not be ' +
-          'more than the length of the file (' +
-          doc.length +
-          ')'
-      );
-    }
-    if (options.start < 0) {
-      throw new Error('Stream end (' + options.end + ') must not be ' + 'negative');
-    }
-
-    var start = options.start != null ? Math.floor(options.start / doc.chunkSize) : 0;
-
-    cursor.limit(Math.ceil(options.end / doc.chunkSize) - start);
-
-    stream.s.expectedEnd = Math.ceil(options.end / doc.chunkSize);
-
-    return Math.ceil(options.end / doc.chunkSize) * doc.chunkSize - options.end;
-  }
-}
-
-/**
- * @ignore
- */
-
-function __handleError(_this, error) {
-  _this.emit('error', error);
-}
diff --git a/node_modules/mongodb/lib/gridfs-stream/index.js b/node_modules/mongodb/lib/gridfs-stream/index.js
deleted file mode 100644
index 6509839..0000000
--- a/node_modules/mongodb/lib/gridfs-stream/index.js
+++ /dev/null
@@ -1,359 +0,0 @@
-'use strict';
-
-var Emitter = require('events').EventEmitter;
-var GridFSBucketReadStream = require('./download');
-var GridFSBucketWriteStream = require('./upload');
-var shallowClone = require('../utils').shallowClone;
-var toError = require('../utils').toError;
-var util = require('util');
-var executeLegacyOperation = require('../utils').executeLegacyOperation;
-
-var DEFAULT_GRIDFS_BUCKET_OPTIONS = {
-  bucketName: 'fs',
-  chunkSizeBytes: 255 * 1024
-};
-
-module.exports = GridFSBucket;
-
-/**
- * Constructor for a streaming GridFS interface
- * @class
- * @extends external:EventEmitter
- * @param {Db} db A db handle
- * @param {object} [options] Optional settings.
- * @param {string} [options.bucketName="fs"] The 'files' and 'chunks' collections will be prefixed with the bucket name followed by a dot.
- * @param {number} [options.chunkSizeBytes=255 * 1024] Number of bytes stored in each chunk. Defaults to 255KB
- * @param {object} [options.writeConcern] Optional write concern to be passed to write operations, for instance `{ w: 1 }`
- * @param {object} [options.readPreference] Optional read preference to be passed to read operations
- * @fires GridFSBucketWriteStream#index
- */
-
-function GridFSBucket(db, options) {
-  Emitter.apply(this);
-  this.setMaxListeners(0);
-
-  if (options && typeof options === 'object') {
-    options = shallowClone(options);
-    var keys = Object.keys(DEFAULT_GRIDFS_BUCKET_OPTIONS);
-    for (var i = 0; i < keys.length; ++i) {
-      if (!options[keys[i]]) {
-        options[keys[i]] = DEFAULT_GRIDFS_BUCKET_OPTIONS[keys[i]];
-      }
-    }
-  } else {
-    options = DEFAULT_GRIDFS_BUCKET_OPTIONS;
-  }
-
-  this.s = {
-    db: db,
-    options: options,
-    _chunksCollection: db.collection(options.bucketName + '.chunks'),
-    _filesCollection: db.collection(options.bucketName + '.files'),
-    checkedIndexes: false,
-    calledOpenUploadStream: false,
-    promiseLibrary: db.s.promiseLibrary || Promise
-  };
-}
-
-util.inherits(GridFSBucket, Emitter);
-
-/**
- * When the first call to openUploadStream is made, the upload stream will
- * check to see if it needs to create the proper indexes on the chunks and
- * files collections. This event is fired either when 1) it determines that
- * no index creation is necessary, 2) when it successfully creates the
- * necessary indexes.
- *
- * @event GridFSBucket#index
- * @type {Error}
- */
-
-/**
- * Returns a writable stream (GridFSBucketWriteStream) for writing
- * buffers to GridFS. The stream's 'id' property contains the resulting
- * file's id.
- * @method
- * @param {string} filename The value of the 'filename' key in the files doc
- * @param {object} [options] Optional settings.
- * @param {number} [options.chunkSizeBytes] Optional overwrite this bucket's chunkSizeBytes for this file
- * @param {object} [options.metadata] Optional object to store in the file document's `metadata` field
- * @param {string} [options.contentType] Optional string to store in the file document's `contentType` field
- * @param {array} [options.aliases] Optional array of strings to store in the file document's `aliases` field
- * @param {boolean} [options.disableMD5=false] If true, disables adding an md5 field to file data
- * @return {GridFSBucketWriteStream}
- */
-
-GridFSBucket.prototype.openUploadStream = function(filename, options) {
-  if (options) {
-    options = shallowClone(options);
-  } else {
-    options = {};
-  }
-  if (!options.chunkSizeBytes) {
-    options.chunkSizeBytes = this.s.options.chunkSizeBytes;
-  }
-  return new GridFSBucketWriteStream(this, filename, options);
-};
-
-/**
- * Returns a writable stream (GridFSBucketWriteStream) for writing
- * buffers to GridFS for a custom file id. The stream's 'id' property contains the resulting
- * file's id.
- * @method
- * @param {string|number|object} id A custom id used to identify the file
- * @param {string} filename The value of the 'filename' key in the files doc
- * @param {object} [options] Optional settings.
- * @param {number} [options.chunkSizeBytes] Optional overwrite this bucket's chunkSizeBytes for this file
- * @param {object} [options.metadata] Optional object to store in the file document's `metadata` field
- * @param {string} [options.contentType] Optional string to store in the file document's `contentType` field
- * @param {array} [options.aliases] Optional array of strings to store in the file document's `aliases` field
- * @param {boolean} [options.disableMD5=false] If true, disables adding an md5 field to file data
- * @return {GridFSBucketWriteStream}
- */
-
-GridFSBucket.prototype.openUploadStreamWithId = function(id, filename, options) {
-  if (options) {
-    options = shallowClone(options);
-  } else {
-    options = {};
-  }
-
-  if (!options.chunkSizeBytes) {
-    options.chunkSizeBytes = this.s.options.chunkSizeBytes;
-  }
-
-  options.id = id;
-
-  return new GridFSBucketWriteStream(this, filename, options);
-};
-
-/**
- * Returns a readable stream (GridFSBucketReadStream) for streaming file
- * data from GridFS.
- * @method
- * @param {ObjectId} id The id of the file doc
- * @param {Object} [options] Optional settings.
- * @param {Number} [options.start] Optional 0-based offset in bytes to start streaming from
- * @param {Number} [options.end] Optional 0-based offset in bytes to stop streaming before
- * @return {GridFSBucketReadStream}
- */
-
-GridFSBucket.prototype.openDownloadStream = function(id, options) {
-  var filter = { _id: id };
-  options = {
-    start: options && options.start,
-    end: options && options.end
-  };
-
-  return new GridFSBucketReadStream(
-    this.s._chunksCollection,
-    this.s._filesCollection,
-    this.s.options.readPreference,
-    filter,
-    options
-  );
-};
-
-/**
- * Deletes a file with the given id
- * @method
- * @param {ObjectId} id The id of the file doc
- * @param {GridFSBucket~errorCallback} [callback]
- */
-
-GridFSBucket.prototype.delete = function(id, callback) {
-  return executeLegacyOperation(this.s.db.s.topology, _delete, [this, id, callback], {
-    skipSessions: true
-  });
-};
-
-/**
- * @ignore
- */
-
-function _delete(_this, id, callback) {
-  _this.s._filesCollection.deleteOne({ _id: id }, function(error, res) {
-    if (error) {
-      return callback(error);
-    }
-
-    _this.s._chunksCollection.deleteMany({ files_id: id }, function(error) {
-      if (error) {
-        return callback(error);
-      }
-
-      // Delete orphaned chunks before returning FileNotFound
-      if (!res.result.n) {
-        var errmsg = 'FileNotFound: no file with id ' + id + ' found';
-        return callback(new Error(errmsg));
-      }
-
-      callback();
-    });
-  });
-}
-
-/**
- * Convenience wrapper around find on the files collection
- * @method
- * @param {Object} filter
- * @param {Object} [options] Optional settings for cursor
- * @param {number} [options.batchSize=1000] The number of documents to return per batch. See {@link https://docs.mongodb.com/manual/reference/command/find|find command documentation}.
- * @param {number} [options.limit] Optional limit for cursor
- * @param {number} [options.maxTimeMS] Optional maxTimeMS for cursor
- * @param {boolean} [options.noCursorTimeout] Optionally set cursor's `noCursorTimeout` flag
- * @param {number} [options.skip] Optional skip for cursor
- * @param {object} [options.sort] Optional sort for cursor
- * @return {Cursor}
- */
-
-GridFSBucket.prototype.find = function(filter, options) {
-  filter = filter || {};
-  options = options || {};
-
-  var cursor = this.s._filesCollection.find(filter);
-
-  if (options.batchSize != null) {
-    cursor.batchSize(options.batchSize);
-  }
-  if (options.limit != null) {
-    cursor.limit(options.limit);
-  }
-  if (options.maxTimeMS != null) {
-    cursor.maxTimeMS(options.maxTimeMS);
-  }
-  if (options.noCursorTimeout != null) {
-    cursor.addCursorFlag('noCursorTimeout', options.noCursorTimeout);
-  }
-  if (options.skip != null) {
-    cursor.skip(options.skip);
-  }
-  if (options.sort != null) {
-    cursor.sort(options.sort);
-  }
-
-  return cursor;
-};
-
-/**
- * Returns a readable stream (GridFSBucketReadStream) for streaming the
- * file with the given name from GridFS. If there are multiple files with
- * the same name, this will stream the most recent file with the given name
- * (as determined by the `uploadDate` field). You can set the `revision`
- * option to change this behavior.
- * @method
- * @param {String} filename The name of the file to stream
- * @param {Object} [options] Optional settings
- * @param {number} [options.revision=-1] The revision number relative to the oldest file with the given filename. 0 gets you the oldest file, 1 gets you the 2nd oldest, -1 gets you the newest.
- * @param {Number} [options.start] Optional 0-based offset in bytes to start streaming from
- * @param {Number} [options.end] Optional 0-based offset in bytes to stop streaming before
- * @return {GridFSBucketReadStream}
- */
-
-GridFSBucket.prototype.openDownloadStreamByName = function(filename, options) {
-  var sort = { uploadDate: -1 };
-  var skip = null;
-  if (options && options.revision != null) {
-    if (options.revision >= 0) {
-      sort = { uploadDate: 1 };
-      skip = options.revision;
-    } else {
-      skip = -options.revision - 1;
-    }
-  }
-
-  var filter = { filename: filename };
-  options = {
-    sort: sort,
-    skip: skip,
-    start: options && options.start,
-    end: options && options.end
-  };
-  return new GridFSBucketReadStream(
-    this.s._chunksCollection,
-    this.s._filesCollection,
-    this.s.options.readPreference,
-    filter,
-    options
-  );
-};
-
-/**
- * Renames the file with the given _id to the given string
- * @method
- * @param {ObjectId} id the id of the file to rename
- * @param {String} filename new name for the file
- * @param {GridFSBucket~errorCallback} [callback]
- */
-
-GridFSBucket.prototype.rename = function(id, filename, callback) {
-  return executeLegacyOperation(this.s.db.s.topology, _rename, [this, id, filename, callback], {
-    skipSessions: true
-  });
-};
-
-/**
- * @ignore
- */
-
-function _rename(_this, id, filename, callback) {
-  var filter = { _id: id };
-  var update = { $set: { filename: filename } };
-  _this.s._filesCollection.updateOne(filter, update, function(error, res) {
-    if (error) {
-      return callback(error);
-    }
-    if (!res.result.n) {
-      return callback(toError('File with id ' + id + ' not found'));
-    }
-    callback();
-  });
-}
-
-/**
- * Removes this bucket's files collection, followed by its chunks collection.
- * @method
- * @param {GridFSBucket~errorCallback} [callback]
- */
-
-GridFSBucket.prototype.drop = function(callback) {
-  return executeLegacyOperation(this.s.db.s.topology, _drop, [this, callback], {
-    skipSessions: true
-  });
-};
-
-/**
- * Return the db logger
- * @method
- * @return {Logger} return the db logger
- * @ignore
- */
-GridFSBucket.prototype.getLogger = function() {
-  return this.s.db.s.logger;
-};
-
-/**
- * @ignore
- */
-
-function _drop(_this, callback) {
-  _this.s._filesCollection.drop(function(error) {
-    if (error) {
-      return callback(error);
-    }
-    _this.s._chunksCollection.drop(function(error) {
-      if (error) {
-        return callback(error);
-      }
-
-      return callback();
-    });
-  });
-}
-
-/**
- * Callback format for all GridFSBucket methods that can accept a callback.
- * @callback GridFSBucket~errorCallback
- * @param {MongoError|undefined} error If present, an error instance representing any errors that occurred
- * @param {*} result If present, a returned result for the method
- */
diff --git a/node_modules/mongodb/lib/gridfs-stream/upload.js b/node_modules/mongodb/lib/gridfs-stream/upload.js
deleted file mode 100644
index 578949a..0000000
--- a/node_modules/mongodb/lib/gridfs-stream/upload.js
+++ /dev/null
@@ -1,538 +0,0 @@
-'use strict';
-
-var core = require('../core');
-var crypto = require('crypto');
-var stream = require('stream');
-var util = require('util');
-var Buffer = require('safe-buffer').Buffer;
-
-var ERROR_NAMESPACE_NOT_FOUND = 26;
-
-module.exports = GridFSBucketWriteStream;
-
-/**
- * A writable stream that enables you to write buffers to GridFS.
- *
- * Do not instantiate this class directly. Use `openUploadStream()` instead.
- *
- * @class
- * @extends external:Writable
- * @param {GridFSBucket} bucket Handle for this stream's corresponding bucket
- * @param {string} filename The value of the 'filename' key in the files doc
- * @param {object} [options] Optional settings.
- * @param {string|number|object} [options.id] Custom file id for the GridFS file.
- * @param {number} [options.chunkSizeBytes] The chunk size to use, in bytes
- * @param {number} [options.w] The write concern
- * @param {number} [options.wtimeout] The write concern timeout
- * @param {number} [options.j] The journal write concern
- * @param {boolean} [options.disableMD5=false] If true, disables adding an md5 field to file data
- * @fires GridFSBucketWriteStream#error
- * @fires GridFSBucketWriteStream#finish
- */
-
-function GridFSBucketWriteStream(bucket, filename, options) {
-  options = options || {};
-  this.bucket = bucket;
-  this.chunks = bucket.s._chunksCollection;
-  this.filename = filename;
-  this.files = bucket.s._filesCollection;
-  this.options = options;
-  // Signals the write is all done
-  this.done = false;
-
-  this.id = options.id ? options.id : core.BSON.ObjectId();
-  this.chunkSizeBytes = this.options.chunkSizeBytes;
-  this.bufToStore = Buffer.alloc(this.chunkSizeBytes);
-  this.length = 0;
-  this.md5 = !options.disableMD5 && crypto.createHash('md5');
-  this.n = 0;
-  this.pos = 0;
-  this.state = {
-    streamEnd: false,
-    outstandingRequests: 0,
-    errored: false,
-    aborted: false,
-    promiseLibrary: this.bucket.s.promiseLibrary
-  };
-
-  if (!this.bucket.s.calledOpenUploadStream) {
-    this.bucket.s.calledOpenUploadStream = true;
-
-    var _this = this;
-    checkIndexes(this, function() {
-      _this.bucket.s.checkedIndexes = true;
-      _this.bucket.emit('index');
-    });
-  }
-}
-
-util.inherits(GridFSBucketWriteStream, stream.Writable);
-
-/**
- * An error occurred
- *
- * @event GridFSBucketWriteStream#error
- * @type {Error}
- */
-
-/**
- * `end()` was called and the write stream successfully wrote the file
- * metadata and all the chunks to MongoDB.
- *
- * @event GridFSBucketWriteStream#finish
- * @type {object}
- */
-
-/**
- * Write a buffer to the stream.
- *
- * @method
- * @param {Buffer} chunk Buffer to write
- * @param {String} encoding Optional encoding for the buffer
- * @param {GridFSBucket~errorCallback} callback Function to call when the chunk was added to the buffer, or if the entire chunk was persisted to MongoDB if this chunk caused a flush.
- * @return {Boolean} False if this write required flushing a chunk to MongoDB. True otherwise.
- */
-
-GridFSBucketWriteStream.prototype.write = function(chunk, encoding, callback) {
-  var _this = this;
-  return waitForIndexes(this, function() {
-    return doWrite(_this, chunk, encoding, callback);
-  });
-};
-
-/**
- * Places this write stream into an aborted state (all future writes fail)
- * and deletes all chunks that have already been written.
- *
- * @method
- * @param {GridFSBucket~errorCallback} callback called when chunks are successfully removed or error occurred
- * @return {Promise} if no callback specified
- */
-
-GridFSBucketWriteStream.prototype.abort = function(callback) {
-  if (this.state.streamEnd) {
-    var error = new Error('Cannot abort a stream that has already completed');
-    if (typeof callback === 'function') {
-      return callback(error);
-    }
-    return this.state.promiseLibrary.reject(error);
-  }
-  if (this.state.aborted) {
-    error = new Error('Cannot call abort() on a stream twice');
-    if (typeof callback === 'function') {
-      return callback(error);
-    }
-    return this.state.promiseLibrary.reject(error);
-  }
-  this.state.aborted = true;
-  this.chunks.deleteMany({ files_id: this.id }, function(error) {
-    if (typeof callback === 'function') callback(error);
-  });
-};
-
-/**
- * Tells the stream that no more data will be coming in. The stream will
- * persist the remaining data to MongoDB, write the files document, and
- * then emit a 'finish' event.
- *
- * @method
- * @param {Buffer} chunk Buffer to write
- * @param {String} encoding Optional encoding for the buffer
- * @param {GridFSBucket~errorCallback} callback Function to call when all files and chunks have been persisted to MongoDB
- */
-
-GridFSBucketWriteStream.prototype.end = function(chunk, encoding, callback) {
-  var _this = this;
-  if (typeof chunk === 'function') {
-    (callback = chunk), (chunk = null), (encoding = null);
-  } else if (typeof encoding === 'function') {
-    (callback = encoding), (encoding = null);
-  }
-
-  if (checkAborted(this, callback)) {
-    return;
-  }
-  this.state.streamEnd = true;
-
-  if (callback) {
-    this.once('finish', function(result) {
-      callback(null, result);
-    });
-  }
-
-  if (!chunk) {
-    waitForIndexes(this, function() {
-      writeRemnant(_this);
-    });
-    return;
-  }
-
-  this.write(chunk, encoding, function() {
-    writeRemnant(_this);
-  });
-};
-
-/**
- * @ignore
- */
-
-function __handleError(_this, error, callback) {
-  if (_this.state.errored) {
-    return;
-  }
-  _this.state.errored = true;
-  if (callback) {
-    return callback(error);
-  }
-  _this.emit('error', error);
-}
-
-/**
- * @ignore
- */
-
-function createChunkDoc(filesId, n, data) {
-  return {
-    _id: core.BSON.ObjectId(),
-    files_id: filesId,
-    n: n,
-    data: data
-  };
-}
-
-/**
- * @ignore
- */
-
-function checkChunksIndex(_this, callback) {
-  _this.chunks.listIndexes().toArray(function(error, indexes) {
-    if (error) {
-      // Collection doesn't exist so create index
-      if (error.code === ERROR_NAMESPACE_NOT_FOUND) {
-        var index = { files_id: 1, n: 1 };
-        _this.chunks.createIndex(index, { background: false, unique: true }, function(error) {
-          if (error) {
-            return callback(error);
-          }
-
-          callback();
-        });
-        return;
-      }
-      return callback(error);
-    }
-
-    var hasChunksIndex = false;
-    indexes.forEach(function(index) {
-      if (index.key) {
-        var keys = Object.keys(index.key);
-        if (keys.length === 2 && index.key.files_id === 1 && index.key.n === 1) {
-          hasChunksIndex = true;
-        }
-      }
-    });
-
-    if (hasChunksIndex) {
-      callback();
-    } else {
-      index = { files_id: 1, n: 1 };
-      var indexOptions = getWriteOptions(_this);
-
-      indexOptions.background = false;
-      indexOptions.unique = true;
-
-      _this.chunks.createIndex(index, indexOptions, function(error) {
-        if (error) {
-          return callback(error);
-        }
-
-        callback();
-      });
-    }
-  });
-}
-
-/**
- * @ignore
- */
-
-function checkDone(_this, callback) {
-  if (_this.done) return true;
-  if (_this.state.streamEnd && _this.state.outstandingRequests === 0 && !_this.state.errored) {
-    // Set done so we dont' trigger duplicate createFilesDoc
-    _this.done = true;
-    // Create a new files doc
-    var filesDoc = createFilesDoc(
-      _this.id,
-      _this.length,
-      _this.chunkSizeBytes,
-      _this.md5 && _this.md5.digest('hex'),
-      _this.filename,
-      _this.options.contentType,
-      _this.options.aliases,
-      _this.options.metadata
-    );
-
-    if (checkAborted(_this, callback)) {
-      return false;
-    }
-
-    _this.files.insertOne(filesDoc, getWriteOptions(_this), function(error) {
-      if (error) {
-        return __handleError(_this, error, callback);
-      }
-      _this.emit('finish', filesDoc);
-    });
-
-    return true;
-  }
-
-  return false;
-}
-
-/**
- * @ignore
- */
-
-function checkIndexes(_this, callback) {
-  _this.files.findOne({}, { _id: 1 }, function(error, doc) {
-    if (error) {
-      return callback(error);
-    }
-    if (doc) {
-      return callback();
-    }
-
-    _this.files.listIndexes().toArray(function(error, indexes) {
-      if (error) {
-        // Collection doesn't exist so create index
-        if (error.code === ERROR_NAMESPACE_NOT_FOUND) {
-          var index = { filename: 1, uploadDate: 1 };
-          _this.files.createIndex(index, { background: false }, function(error) {
-            if (error) {
-              return callback(error);
-            }
-
-            checkChunksIndex(_this, callback);
-          });
-          return;
-        }
-        return callback(error);
-      }
-
-      var hasFileIndex = false;
-      indexes.forEach(function(index) {
-        var keys = Object.keys(index.key);
-        if (keys.length === 2 && index.key.filename === 1 && index.key.uploadDate === 1) {
-          hasFileIndex = true;
-        }
-      });
-
-      if (hasFileIndex) {
-        checkChunksIndex(_this, callback);
-      } else {
-        index = { filename: 1, uploadDate: 1 };
-
-        var indexOptions = getWriteOptions(_this);
-
-        indexOptions.background = false;
-
-        _this.files.createIndex(index, indexOptions, function(error) {
-          if (error) {
-            return callback(error);
-          }
-
-          checkChunksIndex(_this, callback);
-        });
-      }
-    });
-  });
-}
-
-/**
- * @ignore
- */
-
-function createFilesDoc(_id, length, chunkSize, md5, filename, contentType, aliases, metadata) {
-  var ret = {
-    _id: _id,
-    length: length,
-    chunkSize: chunkSize,
-    uploadDate: new Date(),
-    filename: filename
-  };
-
-  if (md5) {
-    ret.md5 = md5;
-  }
-
-  if (contentType) {
-    ret.contentType = contentType;
-  }
-
-  if (aliases) {
-    ret.aliases = aliases;
-  }
-
-  if (metadata) {
-    ret.metadata = metadata;
-  }
-
-  return ret;
-}
-
-/**
- * @ignore
- */
-
-function doWrite(_this, chunk, encoding, callback) {
-  if (checkAborted(_this, callback)) {
-    return false;
-  }
-
-  var inputBuf = Buffer.isBuffer(chunk) ? chunk : Buffer.from(chunk, encoding);
-
-  _this.length += inputBuf.length;
-
-  // Input is small enough to fit in our buffer
-  if (_this.pos + inputBuf.length < _this.chunkSizeBytes) {
-    inputBuf.copy(_this.bufToStore, _this.pos);
-    _this.pos += inputBuf.length;
-
-    callback && callback();
-
-    // Note that we reverse the typical semantics of write's return value
-    // to be compatible with node's `.pipe()` function.
-    // True means client can keep writing.
-    return true;
-  }
-
-  // Otherwise, buffer is too big for current chunk, so we need to flush
-  // to MongoDB.
-  var inputBufRemaining = inputBuf.length;
-  var spaceRemaining = _this.chunkSizeBytes - _this.pos;
-  var numToCopy = Math.min(spaceRemaining, inputBuf.length);
-  var outstandingRequests = 0;
-  while (inputBufRemaining > 0) {
-    var inputBufPos = inputBuf.length - inputBufRemaining;
-    inputBuf.copy(_this.bufToStore, _this.pos, inputBufPos, inputBufPos + numToCopy);
-    _this.pos += numToCopy;
-    spaceRemaining -= numToCopy;
-    if (spaceRemaining === 0) {
-      if (_this.md5) {
-        _this.md5.update(_this.bufToStore);
-      }
-      var doc = createChunkDoc(_this.id, _this.n, Buffer.from(_this.bufToStore));
-      ++_this.state.outstandingRequests;
-      ++outstandingRequests;
-
-      if (checkAborted(_this, callback)) {
-        return false;
-      }
-
-      _this.chunks.insertOne(doc, getWriteOptions(_this), function(error) {
-        if (error) {
-          return __handleError(_this, error);
-        }
-        --_this.state.outstandingRequests;
-        --outstandingRequests;
-
-        if (!outstandingRequests) {
-          _this.emit('drain', doc);
-          callback && callback();
-          checkDone(_this);
-        }
-      });
-
-      spaceRemaining = _this.chunkSizeBytes;
-      _this.pos = 0;
-      ++_this.n;
-    }
-    inputBufRemaining -= numToCopy;
-    numToCopy = Math.min(spaceRemaining, inputBufRemaining);
-  }
-
-  // Note that we reverse the typical semantics of write's return value
-  // to be compatible with node's `.pipe()` function.
-  // False means the client should wait for the 'drain' event.
-  return false;
-}
-
-/**
- * @ignore
- */
-
-function getWriteOptions(_this) {
-  var obj = {};
-  if (_this.options.writeConcern) {
-    obj.w = _this.options.writeConcern.w;
-    obj.wtimeout = _this.options.writeConcern.wtimeout;
-    obj.j = _this.options.writeConcern.j;
-  }
-  return obj;
-}
-
-/**
- * @ignore
- */
-
-function waitForIndexes(_this, callback) {
-  if (_this.bucket.s.checkedIndexes) {
-    return callback(false);
-  }
-
-  _this.bucket.once('index', function() {
-    callback(true);
-  });
-
-  return true;
-}
-
-/**
- * @ignore
- */
-
-function writeRemnant(_this, callback) {
-  // Buffer is empty, so don't bother to insert
-  if (_this.pos === 0) {
-    return checkDone(_this, callback);
-  }
-
-  ++_this.state.outstandingRequests;
-
-  // Create a new buffer to make sure the buffer isn't bigger than it needs
-  // to be.
-  var remnant = Buffer.alloc(_this.pos);
-  _this.bufToStore.copy(remnant, 0, 0, _this.pos);
-  if (_this.md5) {
-    _this.md5.update(remnant);
-  }
-  var doc = createChunkDoc(_this.id, _this.n, remnant);
-
-  // If the stream was aborted, do not write remnant
-  if (checkAborted(_this, callback)) {
-    return false;
-  }
-
-  _this.chunks.insertOne(doc, getWriteOptions(_this), function(error) {
-    if (error) {
-      return __handleError(_this, error);
-    }
-    --_this.state.outstandingRequests;
-    checkDone(_this);
-  });
-}
-
-/**
- * @ignore
- */
-
-function checkAborted(_this, callback) {
-  if (_this.state.aborted) {
-    if (typeof callback === 'function') {
-      callback(new Error('this stream has been aborted'));
-    }
-    return true;
-  }
-  return false;
-}