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gridfs.go
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/
gridfs.go
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// Package mongos
// author gmfan
// date 2023/3/2
package mongos
import (
"bytes"
"github.com/tkgfan/got/core/errs"
"go.mongodb.org/mongo-driver/bson/primitive"
"go.mongodb.org/mongo-driver/mongo/gridfs"
"go.mongodb.org/mongo-driver/mongo/options"
"time"
)
func Bucket(table string) (bucket *gridfs.Bucket, err error) {
if table == "" {
bucket, err = gridfs.NewBucket(DB())
} else {
bucketOptions := options.GridFSBucket().SetName(table)
bucket, err = gridfs.NewBucket(DB(), bucketOptions)
}
if err != nil {
err = errs.Wrapf(err, "创建 Bucket 失败,参数:%+v", table)
}
return
}
// UploadFile 上传文件,上传成功返回 fid
func UploadFile(table string, data []byte) (fid string, err error) {
// 获取 bucket
bucket, err := Bucket(table)
if err != nil {
return
}
// 上传文件
id, err := bucket.UploadFromStream(time.Now().String(), bytes.NewBuffer(data))
if err != nil {
return fid, errs.Wrapf(err, table)
}
return id.Hex(), nil
}
// DownloadFile 下载文件
func DownloadFile(table, fid string) (data []byte, err error) {
bucket, err := Bucket(table)
if err != nil {
return
}
id, _ := primitive.ObjectIDFromHex(fid)
buffer := bytes.NewBuffer(make([]byte, 5<<20))
_, err = bucket.DownloadToStream(id, buffer)
if err != nil {
return nil, errs.Wrapf(err, "下载文件失败 fid=%s", fid)
}
return buffer.Bytes(), nil
}