How to implement oss in golang

In recent years, with the continuous development of cloud computing technology, more and more business systems choose to store data in the cloud to better meet the needs of massive data storage and processing. Alibaba Cloud's OSS (Object Storage Service) is a leading object storage service that provides high availability, high reliability, and high scalability. This article will introduce how to use Golang to implement OSS related functions.

OSS Overview

OSS is a cloud-based object storage service that specifically provides Internet application developers with high scalability, high availability, high reliability and low-cost mass storage services. . OSS provides RESTful API and SDK to facilitate developers to quickly get started and integrate. It also has multiple language development SDKs, such as Java, Python, PHP, C#, Node.js, etc.

The main usage scenarios of OSS are:

• Image, audio and video storage
• Big data storage and static file storage
• Data backup and Disaster Recovery

Golang SDK Introduction

Golang is a fast, safe, and efficient open source programming language that can easily build network services and Web applications. Because Golang has efficient, concise, intuitive and powerful functions, it has become more and more widely used in the Internet field. For Alibaba Cloud services, we can use the golang SDK officially provided by Alibaba Cloud to quickly implement the functions of Alibaba Cloud OSS.

Installation of golang sdk

go get github.com/aliyun/aliyun-oss-go-sdk/oss

Golang SDK usage

First, we need to initialize the oss client. You can directly use AccessKeyId and AccessKeySecret to create the client object.

import "github.com/aliyun/aliyun-oss-go-sdk/oss"

func InitOssClient() (client *oss.Client, err error) {
    endpoint := "<yourEndpoint>"
    accessKeyId := "<yourAccessKeyId>"
    accessKeySecret := "<yourAccessKeySecret>"
    client, err = oss.New(endpoint, accessKeyId, accessKeySecret)
    if err != nil {
        return
    }
    return
}

Then, we need to specify the bucket to use.

func InitBucket() (bucket *oss.Bucket, err error) {
    client, err := InitOssClient()
    if err != nil {
        return
    }
    bucketName := "<yourBucketName>"
    bucket, err = client.Bucket(bucketName)
    if err != nil {
        return 
    }
    return 
}

Next, we can use the API provided by oss sdk to upload and download files. Below is a code example for uploading and downloading files.

Upload file code

func UploadFile(filename, contenttype string, bytes []byte) {
    bucket, err := InitBucket()
    if err != nil {
        fmt.Println("InitBucket failed:", err)
        return 
    }
    objectKey := "<yourObjectName>"
    err = bucket.PutObject(objectKey, bytes, oss.ContentType(contenttype))
    if err != nil {
        fmt.Println("PutObject failed:", err)
        return 
    }
    fmt.Printf("PutObject %s to Bucket %s successed", filename, bucket.BucketName)
}

Download file code

func DownLoadFile(filename string) {
    bucket, err := InitBucket()
    if err != nil {
        fmt.Println("InitBucket failed:", err)
        return 
    }
    objectKey := "<yourObjectName>"
    //判断文件是否存在
    if exist, err := bucket.IsObjectExist(objectKey); err == nil {
        if exist {
            //下载objectKey到本地
            err = bucket.GetObjectToFile(objectKey, filename)
            if err != nil {
                fmt.Println("GetObjectToFile failed:", err)
                return 
            }
            fmt.Println("GetObjectToFile successed")
            return 
        }
        fmt.Println("ObjectKey not found")
        return 
    }
    fmt.Println("GetObjectToFile failed:", err)
}

Conclusion

Using Golang language to perform OSS related operations can quickly and easily implement object storage Various services, such as uploading, downloading, deleting and other operations. At the same time, Golang itself has efficient, concise, intuitive and powerful functions. It is perfectly integrated with OSS, which greatly improves development efficiency and is welcomed by more and more developers.

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