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How to store multiple files using GridFs in golang

Vishal answered on June 19, 2023 Popularity 1/10 Helpfulness 1/10

answer How to store multiple files using GridFs in golang

How to store multiple files using GridFs in golang

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package main

import (
	"context"
	"fmt"
	"io"
	"log"
	"mime/multipart"
	"net/http"
	"os"

	"go.mongodb.org/mongo-driver/mongo"
	"go.mongodb.org/mongo-driver/mongo/options"
	"go.mongodb.org/mongo-driver/mongo/gridfs"
)

// MongoDB connection details
const (
	uri        = "mongodb://localhost:27017"
	dbName     = "fileStorageDB"
	collection = "fs"
)

// UploadFiles uploads multiple files to GridFS
func UploadFiles(w http.ResponseWriter, r *http.Request) {
	// Parse the multipart form data
	err := r.ParseMultipartForm(32 << 20) // 32 MB maximum file size
	if err != nil {
		http.Error(w, "Failed to parse form data", http.StatusBadRequest)
		return
	}

	// Connect to MongoDB
	client, err := mongo.Connect(context.Background(), options.Client().ApplyURI(uri))
	if err != nil {
		log.Fatal(err)
	}
	db := client.Database(dbName)

	// Create a new GridFSBucket
	bucket, err := gridfs.NewBucket(
		db,
	)
	if err != nil {
		log.Fatal(err)
	}

	// Iterate over each file in the form data
	for _, fileHeaders := range r.MultipartForm.File {
		for _, fileHeader := range fileHeaders {
			// Open the uploaded file
			file, err := fileHeader.Open()
			if err != nil {
				log.Println("Failed to open file:", err)
				continue
			}
			defer file.Close()

			// Create a new GridFS upload stream
				uploadStream, err := bucket.OpenUploadStream(fileHeader.Filename)
				if err != nil {
					log.Println("Failed to create upload stream:", err)
					continue
				}
				defer uploadStream.Close()

				// Copy the file data to the GridFS upload stream
				_, err = io.Copy(uploadStream, file)
				if err != nil {
					log.Println("Failed to upload file:", err)
					continue
				}

				log.Println("File uploaded:", fileHeader.Filename)
			}
		}
	}

	fmt.Fprintf(w, "Files uploaded successfully!")
}

// DownloadFile downloads a file from GridFS
func DownloadFile(w http.ResponseWriter, r *http.Request) {
	// Get the filename from the request path
	filename := r.URL.Query().Get("filename")

	// Connect to MongoDB
	client, err := mongo.Connect(context.Background(), options.Client().ApplyURI(uri))
	if err != nil {
		log.Fatal(err)
	}
	db := client.Database(dbName)

	// Create a new GridFSBucket
	bucket, err := gridfs.NewBucket(
		db,
	)
	if err != nil {
		log.Fatal(err)
	}

	// Open a GridFS download stream for the file
	downloadStream, err := bucket.OpenDownloadStreamByName(filename)
	if err != nil {
		log.Fatal(err)
	}
	defer downloadStream.Close()

	// Set the appropriate content type for the response
	w.Header().Set("Content-Type", "application/octet-stream")

	// Copy the file data to the response writer
	_, err = io.Copy(w, downloadStream)
	if err != nil {
		log.Fatal(err)
	}
}

func main() {
	// Set up HTTP routes
	http.HandleFunc("/upload", UploadFiles)
	http.HandleFunc("/download", DownloadFile)

	// Start the server
	log.Println("Server started on port 8080")
	log.Fatal(http.ListenAndServe(":8080", nil))
}

Popularity 1/10 Helpfulness 1/10 Language go

Source: Grepper

Tags: go store

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Contributed on Jun 19 2023

Vishal

0 Answers Avg Quality 2/10

How to store multiple files using GridFs in golang

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