Go implements the basic process of multi-coroutine file upload through goroutine

Article text

Multi-coroutine file upload refers to using multi-threaded or multi-coroutine technology to upload one or more files at the same time to improve upload efficiency and speed. By chunking files, each block is uploaded by a separate coroutine, the total upload time can be effectively reduced. Go language implements multi-coroutine file upload through goroutine.

The basic process of uploading multi-coroutine file

File chunking: Divide large files into multiple small chunks so that multiple coroutines can process different chunks at the same time.
Upload blocks: Each coroutine is responsible for uploading one or more blocks.
Merge blocks: After receiving all blocks on the server side, merge them into the original file.
Error handling and retry mechanisms: Ensure the reliability of uploads, handle failed uploads and try again.

Sample code

Here is a sample code for a simplified multi-coroutine file upload:

package main

import (
	"bytes"
	"fmt"
	"io"
	"math"
	"mime/multipart"
	"net/http"
	"os"
	"sync"
)

// Define the size of each block (for example 5MB)const chunkSize = 5 * 1024 * 1024

// Functions for uploading blocksfunc uploadChunk(url string, filename string, filePart []byte, partNumber int, wg *, errChan chan error) {
	defer ()

	body := new()
	writer := (body)
	part, err := ("file", ("%%d", filename, partNumber))
	if err != nil {
		errChan &lt;- err
		return
	}

	(filePart)
	()

	req, err := ("POST", url, body)
	if err != nil {
		errChan &lt;- err
		return
	}

	("Content-Type", ())
	client := &amp;{}
	resp, err := (req)
	if err != nil {
		errChan &lt;- err
		return
	}
	defer ()

	if  !=  {
		errChan &lt;- ("failed to upload part %d, status: %s", partNumber, )
	}
}

func main() {
	filePath := "path/to/large/file"
	url := "/upload"

	file, err := (filePath)
	if err != nil {
		("Error opening file:", err)
		return
	}
	defer ()

	fileInfo, err := ()
	if err != nil {
		("Error getting file info:", err)
		return
	}

	numParts := int((float64(()) / float64(chunkSize)))
	var wg 
	errChan := make(chan error, numParts)

	for i := 0; i &lt; numParts; i++ {
		partSize := chunkSize
		if i == numParts-1 {
			partSize = int(()) - (i * chunkSize)
		}
		filePart := make([]byte, partSize)
		(filePart)

		(1)
		go uploadChunk(url, (), filePart, i+1, &amp;wg, errChan)
	}

	()
	close(errChan)

	if len(errChan) &gt; 0 {
		for err := range errChan {
			("Error:", err)
		}
	} else {
		("File uploaded successfully")
	}
}

Detailed analysis

1 File chunking:

const chunkSize = 5 * 1024 * 1024

Here the size of each block is 5MB.

2 Upload block function:

func uploadChunk(url string, filename string, filePart []byte, partNumber int, wg *, errChan chan error)

The function that uploads blocks uses goroutine to handle the upload of each block.wgUsed to wait for all goroutines to complete,errChanUsed for error delivery.

3 File reading and chunking:

numParts := int((float64(()) / float64(chunkSize)))

for i := 0; i < numParts; i++ {
   partSize := chunkSize
   if i == numParts-1 {
	   partSize = int(()) - (i * chunkSize)
   }
   filePart := make([]byte, partSize)
   (filePart)

   (1)
   go uploadChunk(url, (), filePart, i+1, &wg, errChan)
}

Calculate the number of files in chunks, read the files one by one, and start goroutine for uploading.

4.Waiting and Error Handling:

()
close(errChan)

if len(errChan) > 0 {
   for err := range errChan {
	   ("Error:", err)
   }
} else {
   ("File uploaded successfully")
}

Wait for all upload goroutines to complete and check for errors.

Summarize

Multi-coroutine file upload improves upload efficiency and speed by chunking and parallel uploading of files. The above sample code shows how to implement basic multi-coroutine file uploads in Go language, including file chunking, uploading and error handling. More details need to be considered in practical applications, such as breakpoint continuous transmission, retry mechanism and progress monitoring.

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