Golang 调用 aws-sdk 操作 S3对象存储

前言

因为业务问题，要写一个S3对象存储管理代码，由于一直写Go，所以这次采用了Go，Go嘛，快，自带多线程，这种好处就不用多说了吧。

基础的功能

1. 查看S3中包含的bucket
2. bucket中的文件/文件夹
3. bucket的删除
4. bucket的创建
5. bucket的文件上传
6. bucket的文件下载
7. bucket的文件删除

aws-sdk 的安装

玩Golang你还能不会那啥？对吧，那啥？那飞机！那飞机场，安上~

go get github.com/aws/aws-sdk-go

aws-sdk-go 的基础使用

构建基础的S3连接

访问S3的时候，咱们需要access_key，secret_key，对象存储访问IP这三个参数，我们首先要创建一个aws的config，说白了，我们需要定义aws的配置，这样它才知道要怎么访问，去哪里访问等问题。
构建一个S3连接代码如下

package main
import (
    "fmt"
    "os"
    "github.com/aws/aws-sdk-go/aws"
    "github.com/aws/aws-sdk-go/aws/credentials"
    _ "github.com/aws/aws-sdk-go/service/s3/s3manager"
    "github.com/aws/aws-sdk-go/aws/session"
    "github.com/aws/aws-sdk-go/service/s3"
)
func main() {

    access_key := "xxxxxxxxxxxxx"
    secret_key := "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
    end_point := "http://xx.xx.xx.xx:7480" //endpoint设置，不要动
    
    sess, err := session.NewSession(&aws.Config{
        Credentials:      credentials.NewStaticCredentials(access_key, secret_key, ""),
        Endpoint:         aws.String(end_point),
        Region:           aws.String("us-east-1"),
        DisableSSL:       aws.Bool(true),
        S3ForcePathStyle: aws.Bool(false), //virtual-host style方式，不要修改
    })
}

这时候需要你自己去定义一下access_key，secret_key，end_point这三个参数
接下来所有的代码，都是以这个连接模板，为核心，后面我就用同上代替配置，请注意！
所有的代码都传到GIT上了，到时候会给出地址，不懂得copy下来吧！

查看S3中包含的bucket

查看所有的bucket

package main
import (
    导入包同上
)

func exitErrorf(msg string, args ...interface{}) {
    fmt.Fprintf(os.Stderr, msg+"
", args...)
    os.Exit(1)
}

func main() {

    配置同上

    svc := s3.New(sess)
    result, err := svc.ListBuckets(nil)
    if err != nil {
        exitErrorf("Unable to list buckets, %v", err)
    }
    
    fmt.Println("Buckets:")
    
    for _, b := range result.Buckets {
        fmt.Printf("* %s created on %s
",
            aws.StringValue(b.Name), aws.TimeValue(b.CreationDate))
    }

    for _, b := range result.Buckets {
        fmt.Printf("%s
", aws.StringValue(b.Name))
    }
    
}

列出bucket中的文件/文件夹

查看某个bucket中包含的文件/文件夹

package main
import (
    "github.com/aws/aws-sdk-go/aws"
    "github.com/aws/aws-sdk-go/aws/session"
    "github.com/aws/aws-sdk-go/aws/credentials"
    "github.com/aws/aws-sdk-go/service/s3"
    "fmt"
    "os"
)

func exitErrorf(msg string, args ...interface{}) {
    fmt.Fprintf(os.Stderr, msg+"
", args...)
    os.Exit(1)
}

func main() {

    配置同上

    // bucket后跟，go run ....go bucketname
    bucket := os.Args[1]
    fmt.Printf(bucket)
    fmt.Printf("
")

    svc := s3.New(sess)

    params := &s3.ListObjectsInput{
        Bucket:             aws.String(bucket), 
    }
    resp, err := svc.ListObjects(params)

    if err != nil {
        exitErrorf("Unable to list items in bucket %q, %v", bucket, err)
    }
    
    for _, item := range resp.Contents {
        fmt.Println("Name:         ", *item.Key)
        fmt.Println("Last modified:", *item.LastModified)
        fmt.Println("Size:         ", *item.Size)
        fmt.Println("Storage class:", *item.StorageClass)
        fmt.Println("")
    }
    
}

bucket的创建

创建bucket

package main

import (
    导包同上
)


func exitErrorf(msg string, args ...interface{}) {
    fmt.Fprintf(os.Stderr, msg+"
", args...)
    os.Exit(1)
}

func main() {

    配置同上

    bucket := os.Args[1]

    if len(os.Args) != 2 {
        exitErrorf("Bucket name required
Usage: %s bucket_name",
            os.Args[0])
    }
    

    // Create S3 service client
    svc := s3.New(sess)

    params := &s3.CreateBucketInput{
        Bucket: aws.String(bucket),
 }

    _, err = svc.CreateBucket(params)

    if err != nil {
        exitErrorf("Unable to create bucket %q, %v", bucket, err)
    }
    
    // Wait until bucket is created before finishing
    fmt.Printf("Waiting for bucket %q to be created...
", bucket)
    
    err = svc.WaitUntilBucketExists(&s3.HeadBucketInput{
        Bucket: aws.String(bucket),
    })

    if err != nil {
        exitErrorf("Error occurred while waiting for bucket to be created, %v", bucket)
    }
    
    fmt.Printf("Bucket %q successfully created
", bucket)
}

bucket的文件上传

往某个固定的bucket里传文件

package main

import (
    "github.com/aws/aws-sdk-go/aws"
    "github.com/aws/aws-sdk-go/aws/session"
    "github.com/aws/aws-sdk-go/aws/credentials"
    "github.com/aws/aws-sdk-go/service/s3/s3manager"
    "fmt"
    "os"
)


func exitErrorf(msg string, args ...interface{}) {
    fmt.Fprintf(os.Stderr, msg+"
", args...)
    os.Exit(1)
}

func main() {

    配置同上

    if len(os.Args) != 3 {
        exitErrorf("bucket and file name required
Usage: %s bucket_name filename",
            os.Args[0])
    }
    
    bucket := os.Args[1]
    filename := os.Args[2]
    
    file, err := os.Open(filename)
    if err != nil {
        exitErrorf("Unable to open file %q, %v", err)
    }
    
    defer file.Close()

    uploader := s3manager.NewUploader(sess)

    _, err = uploader.Upload(&s3manager.UploadInput{
        Bucket: aws.String(bucket),
        Key: aws.String(filename),
        Body: file,
    })
    if err != nil {
        // Print the error and exit.
        exitErrorf("Unable to upload %q to %q, %v", filename, bucket, err)
    }
    
    fmt.Printf("Successfully uploaded %q to %q
", filename, bucket)
}

bucket的文件下载

下载某个bucket中的某个文件

package main

import (
    "github.com/aws/aws-sdk-go/aws"
    "github.com/aws/aws-sdk-go/aws/session"
    "github.com/aws/aws-sdk-go/aws/credentials"
    "github.com/aws/aws-sdk-go/service/s3"
    "github.com/aws/aws-sdk-go/service/s3/s3manager"

    "fmt"
    "os"
)


func exitErrorf(msg string, args ...interface{}) {
    fmt.Fprintf(os.Stderr, msg+"
", args...)
    os.Exit(1)
}

func main() {

    配置同上

    if len(os.Args) != 3 {
        exitErrorf("Bucket and item names required
Usage: %s bucket_name item_name",
            os.Args[0])
    }
    
    bucket := os.Args[1]
    item := os.Args[2]

    file, err := os.Create(item)
    if err != nil {
        exitErrorf("Unable to open file %q, %v", err)
    }

    defer file.Close()
    
    downloader := s3manager.NewDownloader(sess)

    numBytes, err := downloader.Download(file,
    &s3.GetObjectInput{
        Bucket: aws.String(bucket),
        Key:    aws.String(item),
    })
if err != nil {
    exitErrorf("Unable to download item %q, %v", item, err)
}

fmt.Println("Downloaded", file.Name(), numBytes, "bytes")
}   

bucket的文件删除

删除某个bucket里面的某个文件

package main

import (
    "github.com/aws/aws-sdk-go/aws"
    "github.com/aws/aws-sdk-go/aws/session"
    "github.com/aws/aws-sdk-go/aws/credentials"
    "github.com/aws/aws-sdk-go/service/s3"
    "fmt"
    "os"
)


func exitErrorf(msg string, args ...interface{}) {
    fmt.Fprintf(os.Stderr, msg+"
", args...)
    os.Exit(1)
}

func main() {

    配置同上

    if len(os.Args) != 3 {
        exitErrorf("Bucket and object name required
Usage: %s bucket_name object_name",
            os.Args[0])
    }
    
    bucket := os.Args[1]
    obj := os.Args[2]
    
    svc := s3.New(sess)

    _, err = svc.DeleteObject(&s3.DeleteObjectInput{Bucket: aws.String(bucket), Key: aws.String(obj)})
    if err != nil {
        exitErrorf("Unable to delete object %q from bucket %q, %v", obj, bucket, err)
    }

    err = svc.WaitUntilObjectNotExists(&s3.HeadObjectInput{
        Bucket: aws.String(bucket),
        Key:    aws.String(obj),
    })

    fmt.Printf("Object %q successfully deleted
", obj)
}

代码所在地

https://github.com/Alexanderklau/Go_poject/tree/master/Go-Storage