/
backup.go
86 lines (74 loc) · 1.71 KB
/
backup.go
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package etcd
import (
"bytes"
"compress/zlib"
"context"
"crypto/tls"
"crypto/x509"
"io"
"io/ioutil"
"time"
"go.etcd.io/etcd/client/v3"
"go.f110.dev/xerrors"
"go.f110.dev/mono/go/logger"
)
type Backup struct {
data io.ReadCloser
time time.Time
compressed *bytes.Buffer
}
func NewBackup(ctx context.Context, endpoints []string, caCert *x509.Certificate, cert tls.Certificate) (*Backup, error) {
systemPool, err := x509.SystemCertPool()
if err != nil {
return nil, xerrors.WithStack(err)
}
if caCert != nil {
systemPool.AddCert(caCert)
}
var certs []tls.Certificate
if cert.Certificate != nil {
certs = append(certs, cert)
}
cfg := clientv3.Config{
Endpoints: endpoints,
TLS: &tls.Config{
Certificates: certs,
RootCAs: systemPool,
},
}
etcdClient, err := clientv3.New(cfg)
if err != nil {
return nil, xerrors.WithStack(err)
}
data, err := etcdClient.Snapshot(ctx)
if err != nil {
return nil, xerrors.WithStack(err)
}
logger.Log.Info("Succeeded snapshot")
return &Backup{data: data, time: time.Now()}, nil
}
func (b *Backup) Compressed() (io.Reader, error) {
if b.data == nil && b.compressed != nil {
return b.compressed, nil
} else if b.data == nil {
return nil, xerrors.New("internal: failed compress data?. Probably bug.")
}
writeBuffer := new(bytes.Buffer)
w := zlib.NewWriter(writeBuffer)
buf, err := ioutil.ReadAll(b.data)
if err != nil {
return nil, xerrors.WithStack(err)
}
b.data.Close()
b.data = nil
if n, err := w.Write(buf); err != nil {
return nil, xerrors.WithStack(err)
} else if n != len(buf) {
return nil, io.ErrShortWrite
}
b.compressed = writeBuffer
return writeBuffer, nil
}
func (b *Backup) Time() time.Time {
return b.time
}