Implementing high-performance file upload and download system based on Go language

introduction

In web application development, file upload and download is a very common requirement. This article will introduce how to use Go language to implement a safe and efficient local file storage system, including file upload and deletion functions, and comes with a complete error handling mechanism.

Core features

• Safe file naming mechanism
• Concurrent control
• Complete error handling
• File path verification
• Automatically create storage directories

Code implementation

1. File upload implementation

First, let's see how to upload files using this system:

func main() {
    // Create an upload instance    local := &{}
    
    // Suppose we get the file from the HTTP request    var file *
    
    // Upload file    filepath, filename, err := (file)
    if err != nil {
        ("File upload failed:", err)
    }
    
    ("File upload successfully!\nPath: %s\nFile name: %s\n", filepath, filename)
}

2. File deletion implementation

Deleting files is also simple and straightforward:

func main() {
    local := &{}
    
    // Delete the specified file    err := ("example_20240315123456.jpg")
    if err != nil {
        ("File deletion failed:", err)
    }
    
    ("File deletion succeeded!")
}

System highlight analysis

1. Safe file naming mechanism

The system uses MD5 to encrypt the original file name and generate a unique file name in combination with the timestamp to effectively prevent file name conflicts:

name = utils.MD5V([]byte(name))
filename := name + "_" + ().Format("20060102150405") + ext

2. Concurrent control

Use mutex locks to ensure concurrency security in file deletion operations:

var mu 

// Add lock when deleting files()
defer ()

3. Safety check

The system implements multiple security check mechanisms:

• • File path verification
• • Illegal character checking
• • Storage path out-of-bounds detection

if (key, "..") || (key, `/:*?"<>|`) {
    return ("Illegal key")
}

Use scenarios

• 1. Web application file upload
• • Upload account avatar
  • Document Management System
  • Image storage service
• 2. Temporary file management
• • Log file storage
  • Cache file management
  • Data backup
• 3. Resource Management System
• • Upload educational resources
  • Media File Management
  • Document version control

Performance optimization suggestions

• 1. File buffering
• • For large file uploads, consider using buffered read and write
  • Implement breakpoint continuous transmission function
• 2. Storage Optimization
• • Implement file fragmented storage
  • Add file compression function
  • Implement file type verification
• 3. Concurrent optimization
• • Implement upload progress monitoring
  • Add concurrent upload restrictions
  • Implement upload queue

Summarize

Although this file upload system is simple, it contains the core elements of file operation: security, concurrency control and error handling. Through reasonable design and implementation, we can build a reliable file storage system. In practical applications, functions can be expanded and optimized according to specific needs.

Next optimization direction

• Add a whitelist of file types
• Implement file size limit
• Add file storage capacity management
• Implement file metadata storage
• Add file access control

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