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storage.go
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storage.go
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package storage
import (
"context"
"encoding/json"
"strconv"
"github.com/cybozu-go/neco"
clientv3 "go.etcd.io/etcd/client/v3"
"go.etcd.io/etcd/client/v3/clientv3util"
)
// Storage is storage client
type Storage struct {
etcd *clientv3.Client
}
// NewStorage returns Storage that stores data in etcd.
func NewStorage(etcd *clientv3.Client) Storage {
return Storage{etcd}
}
// RecordContainerTag records installed container image tag
func (s Storage) RecordContainerTag(ctx context.Context, lrn int, name string) error {
img, err := neco.CurrentArtifacts.FindContainerImage(name)
if err != nil {
return err
}
key := keyContainer(lrn, name)
_, err = s.etcd.Put(ctx, key, img.Tag)
return err
}
// GetContainerTag returns installed container image tag
func (s Storage) GetContainerTag(ctx context.Context, lrn int, name string) (string, error) {
key := keyContainer(lrn, name)
resp, err := s.etcd.Get(ctx, key)
if err != nil {
return "", err
}
if resp.Count == 0 {
return "", ErrNotFound
}
return string(resp.Kvs[0].Value), nil
}
// RecordDebVersion records installed debian package version
func (s Storage) RecordDebVersion(ctx context.Context, lrn int, name string) error {
deb, err := neco.CurrentArtifacts.FindDebianPackage(name)
if err != nil {
return err
}
key := keyDeb(lrn, name)
_, err = s.etcd.Put(ctx, key, deb.Release)
return err
}
// GetDebVersion returns installed debian package version
func (s Storage) GetDebVersion(ctx context.Context, lrn int, name string) (string, error) {
key := keyDeb(lrn, name)
resp, err := s.etcd.Get(ctx, key)
if err != nil {
return "", err
}
if resp.Count == 0 {
return "", ErrNotFound
}
return string(resp.Kvs[0].Value), nil
}
// PutRequest stores UpdateRequest to storage
// leaderKey is the current leader key.
// If the caller has lost the leadership, this returns ErrNoLeader.
func (s Storage) PutRequest(ctx context.Context, req neco.UpdateRequest, leaderKey string) error {
data, err := json.Marshal(req)
if err != nil {
return err
}
resp, err := s.etcd.Txn(ctx).
If(clientv3util.KeyExists(leaderKey)).
Then(clientv3.OpPut(KeyCurrent, string(data))).
Commit()
if err != nil {
return err
}
if !resp.Succeeded {
return ErrNoLeader
}
return nil
}
// PutReconfigureRequest stores UpdateRequest to storage and
// delete worker statuses in a single transaction.
// leaderKey is the current leader key.
// If the caller has lost the leadership, this returns ErrNoLeader.
func (s Storage) PutReconfigureRequest(ctx context.Context, req neco.UpdateRequest, leaderKey string) error {
data, err := json.Marshal(req)
if err != nil {
return err
}
resp, err := s.etcd.Txn(ctx).
If(clientv3util.KeyExists(leaderKey)).
Then(
clientv3.OpPut(KeyCurrent, string(data)),
clientv3.OpDelete(KeyWorkerStatusPrefix, clientv3.WithPrefix()),
).
Commit()
if err != nil {
return err
}
if !resp.Succeeded {
return ErrNoLeader
}
return nil
}
// GetRequestWithRev returns UpdateRequest from storage with ModRevision and Revision.
// If there is no request, this returns ErrNotFound
func (s Storage) GetRequestWithRev(ctx context.Context) (req *neco.UpdateRequest, modRev int64, rev int64, err error) {
resp, err := s.etcd.Get(ctx, KeyCurrent)
if err != nil {
return nil, 0, 0, err
}
if resp.Count == 0 {
return nil, 0, resp.Header.Revision, ErrNotFound
}
req = new(neco.UpdateRequest)
err = json.Unmarshal(resp.Kvs[0].Value, req)
if err != nil {
return nil, 0, 0, err
}
return req, resp.Kvs[0].ModRevision, resp.Header.Revision, nil
}
// GetRequest returns UpdateRequest from storage
// If there is no request, this returns ErrNotFound
func (s Storage) GetRequest(ctx context.Context) (*neco.UpdateRequest, error) {
req, _, _, err := s.GetRequestWithRev(ctx)
return req, err
}
// PutStatus stores UpdateStatus of a bootserver to storage
func (s Storage) PutStatus(ctx context.Context, lrn int, st neco.UpdateStatus) error {
data, err := json.Marshal(st)
if err != nil {
return err
}
_, err = s.etcd.Put(ctx, keyStatus(lrn), string(data))
return err
}
// GetStatus returns UpdateStatus of a bootserver from storage
// If not found, this returns ErrNotFound.
func (s Storage) GetStatus(ctx context.Context, lrn int) (*neco.UpdateStatus, error) {
resp, err := s.etcd.Get(ctx, keyStatus(lrn))
if err != nil {
return nil, err
}
if resp.Count == 0 {
return nil, ErrNotFound
}
st := new(neco.UpdateStatus)
err = json.Unmarshal(resp.Kvs[0].Value, st)
if err != nil {
return nil, err
}
return st, nil
}
func (s Storage) getStatusesAt(ctx context.Context, rev int64) (map[int]*neco.UpdateStatus, error) {
resp, err := s.etcd.Get(ctx, KeyWorkerStatusPrefix,
clientv3.WithPrefix(),
clientv3.WithRev(rev))
if err != nil {
return nil, err
}
if resp.Count == 0 {
return nil, nil
}
stMap := make(map[int]*neco.UpdateStatus)
for _, kv := range resp.Kvs {
lrn, err := strconv.Atoi(string(kv.Key[len(KeyWorkerStatusPrefix):]))
if err != nil {
return nil, err
}
u := new(neco.UpdateStatus)
err = json.Unmarshal(kv.Value, u)
if err != nil {
return nil, err
}
stMap[lrn] = u
}
return stMap, nil
}
// GetStatuses returns UpdateStatus of existing boot servers.
func (s Storage) GetStatuses(ctx context.Context) (map[int]*neco.UpdateStatus, error) {
return s.getStatusesAt(ctx, 0)
}
// ClearStatusAndContents removes KeyStatusPrefix/* and KeyContentsPrefix/* from storage.
//
// It first checks that "stop" field in KeyCurrent is true. If not,
// ErrNotStopped will be returned.
//
// Then it removes status keys in a single transaction.
func (s Storage) ClearStatusAndContents(ctx context.Context) error {
RETRY:
req, modRev, _, err := s.GetRequestWithRev(ctx)
if err != nil {
return err
}
if !req.Stop {
return ErrNotStopped
}
resp, err := s.etcd.Txn(ctx).
If(clientv3.Compare(clientv3.ModRevision(KeyCurrent), "=", modRev)).
Then(
clientv3.OpDelete(KeyStatusPrefix, clientv3.WithPrefix()),
clientv3.OpDelete(KeyContentsPrefix, clientv3.WithPrefix()),
).
Commit()
if err != nil {
return err
}
if !resp.Succeeded {
goto RETRY
}
return nil
}