/
backup.go
150 lines (141 loc) · 4.01 KB
/
backup.go
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package s3
import (
"bytes"
"fmt"
"regexp"
"strings"
"time"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/credentials"
"github.com/aws/aws-sdk-go/aws/session"
sthree "github.com/aws/aws-sdk-go/service/s3"
store2 "github.com/micro/micro/v3/service/events/store"
"github.com/micro/micro/v3/service/logger"
"github.com/micro/micro/v3/service/store"
)
type backupImpl struct {
client *sthree.S3
opts Options
}
func NewBackup(opts ...Option) store2.Backup {
// parse the options
options := Options{Secure: true}
for _, o := range opts {
o(&options)
}
sess := session.Must(session.NewSession(&aws.Config{
Endpoint: &options.Endpoint,
Region: &options.Region,
Credentials: credentials.NewStaticCredentials(options.AccessKeyID, options.SecretAccessKey, ""),
}))
client := sthree.New(sess)
return &backupImpl{client: client, opts: options}
}
func (i *backupImpl) Snapshot(st store.Store) error {
// find latest S3 backup file
out, err := i.client.ListObjects(&sthree.ListObjectsInput{
Bucket: aws.String(i.opts.Bucket),
Prefix: aws.String("micro/eventsBackup/"),
})
if err != nil {
logger.Errorf("Error retrieving objects from bucket %s", err)
return err
}
latest := time.Now().Add(-12 * time.Hour).Format("2006010215") // default to now
// list operations results are returned in utf8 binary order
for _, obj := range out.Contents {
parts := strings.Split(*obj.Key, "/")
objName := parts[len(parts)-1]
if match, _ := regexp.MatchString("^[0-9]{10}", objName); !match {
continue
}
latest = objName
}
// Work out what the next backup period should be, backup
t, err := time.Parse("2006010215", latest[:10])
if err != nil {
ferr := fmt.Errorf("error parsing time %s", err)
logger.Error(ferr.Error())
return ferr
}
// loop until all the eligible backup periods are completed
rollBackNum := 0
dateLoop:
for {
t = t.Add(1 * time.Hour)
if time.Since(t) < 1*time.Hour {
// our work is done here
logger.Info("No more backups to be completed right now")
break dateLoop
}
next := t.Format("2006010215")
logger.Infof("Performing backup for %s", next)
// read all the entries
uploadNum := 0
offset := 0
limit := 100
buf := &bytes.Buffer{}
for {
recs, err := st.Read("/"+next, store.ReadSuffix(), store.ReadLimit(uint(limit)), store.ReadOffset(uint(offset)))
if err == store.ErrNotFound || len(recs) == 0 {
logger.Errorf("No records found")
break
} else if err != nil {
logger.Errorf("Error reading recs %s", err)
return err
}
logger.Infof("Processing %d records", len(recs))
// process
for _, rec := range recs {
// 1 record per line
buf.Write(rec.Value)
buf.WriteString("\n")
if buf.Len() >= 50000000 { // 50MB to help constrain the process size
uploadNum++
if err := i.uploadToS3(fmt.Sprintf("%s-%d", next, uploadNum), buf); err != nil {
rollBackNum = uploadNum
break dateLoop
}
}
}
offset += limit
}
// write anything leftover to file and upload
uploadNum++
if err := i.uploadToS3(fmt.Sprintf("%s-%d", next, uploadNum), buf); err != nil {
rollBackNum = uploadNum
break dateLoop
}
}
if rollBackNum > 0 {
// rollback this date so we can retry later
d := t.Format("2006010215")
for num := 1; num <= rollBackNum; num++ {
if _, err := i.client.DeleteObject(&sthree.DeleteObjectInput{
Bucket: aws.String(i.opts.Bucket),
Key: aws.String(fmt.Sprintf("micro/eventsBackup/%s-%s", d, num)),
}); err != nil {
logger.Errorf("Error during rollback %s", err)
}
}
}
logger.Infof("Backup complete")
return nil
}
func (i *backupImpl) uploadToS3(key string, buf *bytes.Buffer) error {
if buf.Len() == 0 {
return nil
}
_, err := i.client.PutObject(&sthree.PutObjectInput{
Bucket: aws.String(i.opts.Bucket),
Body: bytes.NewReader(buf.Bytes()),
Key: aws.String(fmt.Sprintf("micro/eventsBackup/%s", key)),
ACL: aws.String("private"),
})
if err != nil {
logger.Errorf("Error uploading %s", err)
return err
}
buf.Reset()
return nil
}