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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_test
import (
"bytes"
"context"
"fmt"
"io"
"log"
"time"
"go.mongodb.org/mongo-driver/bson"
"go.mongodb.org/mongo-driver/bson/primitive"
"go.mongodb.org/mongo-driver/mongo/gridfs"
"go.mongodb.org/mongo-driver/mongo/options"
)
func ExampleBucket_OpenUploadStream() {
var fileContent []byte
var bucket *gridfs.Bucket
// Specify the Metadata option to include a "metadata" field in the files
// collection document.
uploadOpts := options.GridFSUpload().
SetMetadata(bson.D{{"metadata tag", "tag"}})
uploadStream, err := bucket.OpenUploadStream("filename", uploadOpts)
if err != nil {
log.Panic(err)
}
defer func() {
if err = uploadStream.Close(); err != nil {
log.Panic(err)
}
}()
// Use SetWriteDeadline to force a timeout if the upload does not succeed in
// 2 seconds.
err = uploadStream.SetWriteDeadline(time.Now().Add(2 * time.Second))
if err != nil {
log.Panic(err)
}
if _, err = uploadStream.Write(fileContent); err != nil {
log.Panic(err)
}
}
func ExampleBucket_UploadFromStream() {
var fileContent []byte
var bucket *gridfs.Bucket
// Specify the Metadata option to include a "metadata" field in the files
// collection document.
uploadOpts := options.GridFSUpload().
SetMetadata(bson.D{{"metadata tag", "tag"}})
fileID, err := bucket.UploadFromStream(
"filename",
bytes.NewBuffer(fileContent),
uploadOpts)
if err != nil {
log.Panic(err)
}
fmt.Printf("new file created with ID %s", fileID)
}
func ExampleBucket_OpenDownloadStream() {
var bucket *gridfs.Bucket
var fileID primitive.ObjectID
downloadStream, err := bucket.OpenDownloadStream(fileID)
if err != nil {
log.Panic(err)
}
defer func() {
if err := downloadStream.Close(); err != nil {
log.Panic(err)
}
}()
// Use SetReadDeadline to force a timeout if the download does not succeed
// in 2 seconds.
err = downloadStream.SetReadDeadline(time.Now().Add(2 * time.Second))
if err != nil {
log.Panic(err)
}
fileBuffer := bytes.NewBuffer(nil)
if _, err := io.Copy(fileBuffer, downloadStream); err != nil {
log.Panic(err)
}
}
func ExampleBucket_DownloadToStream() {
var bucket *gridfs.Bucket
var fileID primitive.ObjectID
fileBuffer := bytes.NewBuffer(nil)
if _, err := bucket.DownloadToStream(fileID, fileBuffer); err != nil {
log.Panic(err)
}
}
func ExampleBucket_Delete() {
var bucket *gridfs.Bucket
var fileID primitive.ObjectID
if err := bucket.Delete(fileID); err != nil {
log.Panic(err)
}
}
func ExampleBucket_Find() {
var bucket *gridfs.Bucket
// Specify a filter to find all files with a length greater than 1000 bytes.
filter := bson.D{
{"length", bson.D{{"$gt", 1000}}},
}
cursor, err := bucket.Find(filter)
if err != nil {
log.Panic(err)
}
defer func() {
if err := cursor.Close(context.TODO()); err != nil {
log.Panic(err)
}
}()
type gridfsFile struct {
Name string `bson:"filename"`
Length int64 `bson:"length"`
}
var foundFiles []gridfsFile
if err = cursor.All(context.TODO(), &foundFiles); err != nil {
log.Panic(err)
}
for _, file := range foundFiles {
fmt.Printf("filename: %s, length: %d\n", file.Name, file.Length)
}
}
func ExampleBucket_Rename() {
var bucket *gridfs.Bucket
var fileID primitive.ObjectID
if err := bucket.Rename(fileID, "new file name"); err != nil {
log.Panic(err)
}
}
func ExampleBucket_Drop() {
var bucket *gridfs.Bucket
if err := bucket.Drop(); err != nil {
log.Panic(err)
}
}
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