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// Copyright (C) MongoDB, Inc. 2017-present. // // Licensed under the Apache License, Version 2.0 (the "License"); you may // not use this file except in compliance with the License. You may obtain // a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 // Package gridfs provides a MongoDB GridFS API. See https://www.mongodb.com/docs/manual/core/gridfs/ for more // information about GridFS and its use cases. // // # Buckets // // The main type defined in this package is Bucket. A Bucket wraps a mongo.Database instance and operates on two // collections in the database. The first is the files collection, which contains one metadata document per file stored // in the bucket. This collection is named "<bucket name>.files". The second is the chunks collection, which contains // chunks of files. This collection is named "<bucket name>.chunks". // // # Uploading a File // // Files can be uploaded in two ways: // // 1. OpenUploadStream/OpenUploadStreamWithID - These methods return an UploadStream instance. UploadStream // implements the io.Writer interface and the Write() method can be used to upload a file to the database. // // 2. UploadFromStream/UploadFromStreamWithID - These methods take an io.Reader, which represents the file to // upload. They internally create a new UploadStream and close it once the operation is complete. // // # Downloading a File // // Similar to uploads, files can be downloaded in two ways: // // 1. OpenDownloadStream/OpenDownloadStreamByName - These methods return a DownloadStream instance. DownloadStream // implements the io.Reader interface. A file can be read either using the Read() method or any standard library // methods that reads from an io.Reader such as io.Copy. // // 2. DownloadToStream/DownloadToStreamByName - These methods take an io.Writer, which represents the download // destination. They internally create a new DownloadStream and close it once the operation is complete. package gridfs