How to deal with concurrent file upload problems in Go language?

With the development of the Internet, file uploading has become more and more common in daily development. In the process of file upload, handling the concurrent upload of multiple files has become a key consideration. This article will introduce how to use Go language to handle concurrent file upload issues and provide specific code examples.

1. Upload files to the server
Before starting concurrent file upload, you first need to understand how to upload a file to the server. For file upload using Go language, you can use the net/http package in the standard library. The following is a simple sample code:

package main

import (
    "log"
    "net/http"
    "os"
)

func uploadHandler(w http.ResponseWriter, r *http.Request) {
    // 解析文件
    err := r.ParseMultipartForm(32 << 20)
    if err != nil {
        log.Println(err)
        return
    }

    // 獲取文件句柄
    file, handler, err := r.FormFile("file")
    if err != nil {
        log.Println(err)
        return
    }
    defer file.Close()

    // 創(chuàng)建文件
    dst, err := os.Create(handler.Filename)
    if err != nil {
        log.Println(err)
        return
    }
    defer dst.Close()

    // 復(fù)制文件數(shù)據(jù)到服務(wù)器
    _, err = io.Copy(dst, file)
    if err != nil {
        log.Println(err)
        return
    }

    // 成功上傳
    log.Println("文件上傳成功")
}

func main() {
    http.HandleFunc("/upload", uploadHandler)
    log.Fatal(http.ListenAndServe(":8080", nil))
}

The above code defines an upload processing function uploadHandler, which is connected to the path / through http.HandleFunc upload binding to handle upload requests. In the function, first parse the uploaded form through ParseMultipartForm, and then obtain the file handle through FormFile. Next, create the file through os.Create and copy the file data to the server through io.Copy. Finally, print a message indicating successful upload.

2. Concurrent file upload
After understanding the basic process of file upload, we will introduce how to handle the concurrent upload of multiple files. Concurrent uploading using Go language can be achieved using the combination of goroutine and channel.

package main

import (
    "log"
    "net/http"
    "os"
    "io"
)

func uploadHandler(w http.ResponseWriter, r *http.Request) {
    err := r.ParseMultipartForm(32 << 20)
    if err != nil {
        log.Println(err)
        return
    }

    // 獲取文件句柄
    fileHeaders := r.MultipartForm.File["files"]

    // 創(chuàng)建一個(gè)用于接收上傳完成信號(hào)的通道
    doneCh := make(chan bool)

    for _, fileHeader := range fileHeaders {
        go func(fileHeader *multipart.FileHeader) {
            // 打開文件
            file, err := fileHeader.Open()
            if err != nil {
                log.Println(err)
                doneCh <- true
                return
            }
            defer file.Close()

            // 創(chuàng)建文件
            dst, err := os.Create(fileHeader.Filename)
            if err != nil {
                log.Println(err)
                doneCh <- true
                return
            }
            defer dst.Close()

            // 復(fù)制文件數(shù)據(jù)到服務(wù)器
            _, err = io.Copy(dst, file)
            if err != nil {
                log.Println(err)
                doneCh <- true
                return
            }

            doneCh <- true
        }(fileHeader)
    }

    // 等待所有文件上傳完成
    for i := 0; i < len(fileHeaders); i++ {
        <-doneCh
    }

    log.Println("文件上傳完成")
}

func main() {
    http.HandleFunc("/upload", uploadHandler)
    log.Fatal(http.ListenAndServe(":8080", nil))
}

The above code uses a goroutine to process each uploaded file to achieve concurrent uploading. Use a channel doneCh to receive the upload completion signal, and wait for all files to be uploaded through . Finally, print the prompt message that the upload is completed.

Summary
This article introduces how to use Go language to handle concurrent file upload issues and provides corresponding code examples. By understanding the concepts of concurrency and channels in the Go language, you can handle concurrent file uploads more flexibly and improve system performance and efficiency. I hope this article will help readers further master the concurrent programming and file operations of Go language.

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