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client.go
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client.go
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package s3
import (
cfenv "github.com/cloudfoundry-community/go-cfenv"
"github.com/minio/minio-go/v6"
"github.com/swisscom/backman/config"
"github.com/swisscom/backman/log"
)
// Client is used interact with S3 storage
type Client struct {
Client *minio.Client
BucketName string
}
func New(app *cfenv.App) *Client {
// setup minio/s3 client
var s3Service cfenv.Service
if len(config.Get().S3.ServiceName) > 0 {
// determine s3 service via provided service name
s, err := app.Services.WithName(config.Get().S3.ServiceName)
if err != nil {
log.Fatalf("could not get s3 service [%s] from VCAP environment: %v", config.Get().S3.ServiceName, err)
}
s3Service = *s
} else {
// determine s3 service via provided service label
s3Services, err := app.Services.WithLabel(config.Get().S3.ServiceLabel)
if err != nil {
log.Fatalf("could not get s3 service from VCAP environment: %v", err)
}
if len(s3Services) != 1 {
log.Fatalf("there must be exactly one defined S3 service, but found %d instead", len(s3Services))
}
s3Service = s3Services[0]
}
bucketName := config.Get().S3.BucketName
if len(bucketName) == 0 { // fallback to service binding's name
bucketName = s3Service.Name
}
if len(bucketName) == 0 {
log.Fatalln("bucket name for S3 storage is not configured properly")
}
endpoint, _ := s3Service.CredentialString("accessHost")
accessKeyID, _ := s3Service.CredentialString("accessKey")
secretAccessKey, _ := s3Service.CredentialString("sharedSecret")
useSSL := !config.Get().S3.DisableSSL
minioClient, err := minio.NewV4(endpoint, accessKeyID, secretAccessKey, useSSL)
if err != nil {
log.Fatalf("%v", err)
}
// check if bucket exists and is accessible and if not create it, or fail
exists, errBucketExists := minioClient.BucketExists(bucketName)
if errBucketExists == nil && exists {
log.Infof("S3 bucket [%s] found", bucketName)
} else {
if err := minioClient.MakeBucket(bucketName, ""); err != nil {
log.Fatalf("S3 bucket [%s] could not be created: %v", bucketName, err)
exists, errBucketExists := minioClient.BucketExists(bucketName)
if errBucketExists != nil || exists {
log.Fatalf("S3 bucket [%s] is not accessible: %v", bucketName, err)
}
} else {
log.Infof("new S3 bucket [%s] was successfully created", bucketName)
}
}
return &Client{
Client: minioClient,
BucketName: bucketName,
}
}