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storeuploader.go
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storeuploader.go
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/*
Copyright 2020 The Kubermatic Kubernetes Platform contributors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package storeuploader
import (
"errors"
"fmt"
"os"
"path"
"sort"
"time"
"github.com/minio/minio-go"
"go.uber.org/zap"
)
// prefix separator separates the prefix
// from the file name. This is required to not have
// the storeuploader manage all files when prefix
// is an empty string
const prefixSeparator = "storeuploader"
// StoreUploader is the configuration
// for the StoreUploader
type StoreUploader struct {
// client is a pointer to an initialized client
client *minio.Client
logger *zap.SugaredLogger
}
// New returns a new instance of the StoreUploader
func New(endpoint string, secure bool, accessKeyID, secretAccessKey string, logger *zap.SugaredLogger) (*StoreUploader, error) {
client, err := minio.New(endpoint, accessKeyID, secretAccessKey, secure)
if err != nil {
return nil, err
}
client.SetAppInfo("kubermatic-store-uploader", "v0.1")
return &StoreUploader{
client: client,
logger: logger,
}, nil
}
// Store uploads the given file to S3
func (u *StoreUploader) Store(file, bucket, prefix string, createBucket bool) error {
if len(prefix) == 0 {
return errors.New("prefix cannot be empty")
}
if _, err := os.Stat(file); os.IsNotExist(err) {
return fmt.Errorf("%s not found", file)
}
logger := u.logger.With("bucket", bucket)
if createBucket {
logger.Debug("Check if bucket exists")
exists, err := u.client.BucketExists(bucket)
if err != nil {
return err
}
if !exists {
logger.Infow("Creating bucket")
if err := u.client.MakeBucket(bucket, ""); err != nil {
return err
}
}
}
objectName := fmt.Sprintf("%s-%s-%s-%s", prefix, prefixSeparator, time.Now().Format("2006-01-02T15:04:05"), path.Base(file))
logger.Infow("Uploading file", "src", file, "dst", objectName)
_, err := u.client.FPutObject(bucket, objectName, file, minio.PutObjectOptions{})
return err
}
// DeleteOldBackups deletes revisions of all files of the given prefix which are older than max-revisions
func (u *StoreUploader) DeleteOldBackups(bucket, prefix string, revisionsToKeep int) error {
if len(prefix) == 0 {
return errors.New("prefix cannot be empty")
}
doneCh := make(chan struct{})
defer close(doneCh)
logger := u.logger.With("bucket", bucket, "prefix", prefix, "keep", revisionsToKeep)
logger.Debugw("Listing existing objects")
var existingObjects []minio.ObjectInfo
for object := range u.client.ListObjects(bucket, fmt.Sprintf("%s-%s", prefix, prefixSeparator), true, doneCh) {
if object.Err != nil {
return object.Err
}
existingObjects = append(existingObjects, object)
}
logger.Debugw("Done listing bucket", "objects", len(existingObjects))
for _, object := range u.getObjectsToDelete(existingObjects, revisionsToKeep) {
logger.Infow("Removing object", "object", object.Key)
if err := u.client.RemoveObject(bucket, object.Key); err != nil {
return err
}
}
return nil
}
// DeleteAll deletes all revisions of all files matching the given prefix
func (u *StoreUploader) DeleteAll(bucket, prefix string) error {
if len(prefix) == 0 {
return errors.New("prefix cannot be empty")
}
doneCh := make(chan struct{})
defer close(doneCh)
logger := u.logger.With("bucket", bucket, "prefix", prefix)
logger.Debugw("Listing existing objects")
var existingObjects []minio.ObjectInfo
for object := range u.client.ListObjects(bucket, fmt.Sprintf("%s-%s", prefix, prefixSeparator), true, doneCh) {
if object.Err != nil {
return object.Err
}
existingObjects = append(existingObjects, object)
}
logger.Debugw("Done listing bucket", "objects", len(existingObjects))
for _, object := range existingObjects {
logger.Infow("Removing object", "object", object.Key)
if err := u.client.RemoveObject(bucket, object.Key); err != nil {
return err
}
}
return nil
}
func (u *StoreUploader) getObjectsToDelete(objects []minio.ObjectInfo, revisionsToKeep int) []minio.ObjectInfo {
if len(objects) <= revisionsToKeep {
return nil
}
sort.Slice(objects, func(i, j int) bool {
return objects[i].LastModified.Before(objects[j].LastModified)
})
numRevisionsToDelete := len(objects) - revisionsToKeep
var objectsToDelete []minio.ObjectInfo
for idx, object := range objects {
if idx >= numRevisionsToDelete {
return objectsToDelete
}
objectsToDelete = append(objectsToDelete, object)
}
return objectsToDelete
}