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snapshot.go
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snapshot.go
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package storage
import (
"context"
"encoding/json"
"strconv"
"github.com/cybozu-go/neco"
clientv3 "go.etcd.io/etcd/client/v3"
)
// Snapshot is the up-to-date snapshot of etcd database.
type Snapshot struct {
Revision int64
Request *neco.UpdateRequest
Statuses map[int]*neco.UpdateStatus
Latest string
Servers []int
}
// NewSnapshot takes the up-to-date snapshot.
func (s Storage) NewSnapshot(ctx context.Context) (*Snapshot, error) {
snap := &Snapshot{}
resp, err := s.etcd.Get(ctx, KeyCurrent)
if err != nil {
return nil, err
}
rev := resp.Header.Revision
snap.Revision = rev
if resp.Count > 0 {
req := new(neco.UpdateRequest)
err = json.Unmarshal(resp.Kvs[0].Value, req)
if err != nil {
return nil, err
}
snap.Request = req
}
resp, err = s.etcd.Get(ctx, KeyBootserversPrefix,
clientv3.WithPrefix(),
clientv3.WithRev(rev),
clientv3.WithKeysOnly())
if err != nil {
return nil, err
}
var lrns []int
if resp.Count > 0 {
lrns = make([]int, resp.Count)
for i, kv := range resp.Kvs {
lrn, err := strconv.Atoi(string(kv.Key[len(KeyBootserversPrefix):]))
if err != nil {
return nil, err
}
lrns[i] = lrn
}
snap.Servers = lrns
}
resp, err = s.etcd.Get(ctx, KeyNecoRelease, clientv3.WithRev(rev))
if err != nil {
return nil, err
}
if resp.Count > 0 {
snap.Latest = string(resp.Kvs[0].Value)
}
statuses, err := s.getStatusesAt(ctx, rev)
if err != nil {
return nil, err
}
snap.Statuses = statuses
return snap, nil
}