/
renew_cred.go
80 lines (70 loc) · 2.2 KB
/
renew_cred.go
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// Copyright 2021 PairMesh, Inc.
//
// 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 driver
import (
"context"
"encoding/base64"
"time"
"go.uber.org/zap"
)
type credential struct {
address string
// The raw bytes representation of credential
RawBytes []byte
// The BASE64 representation of credential
Base64 string
// The renew credential time
RenewedAt time.Time
// The lease of credential
Lease time.Duration
}
func (d *NodeDriver) renewCredential(ctx context.Context) {
defer d.wg.Done()
nextRenewTime := func() <-chan time.Time {
// Next retry renew time
expirationAt := d.credential.RenewedAt.Add(d.credential.Lease)
if expirationAt.Before(time.Now()) {
zap.L().Fatal("The credential is invalid due to expiration")
}
return time.After(time.Until(expirationAt) / 2)
}
renewCredTimer := nextRenewTime()
for {
select {
case <-ctx.Done():
zap.L().Info("Heartbeat and renew goroutine stopped")
return
case <-renewCredTimer:
res, err := d.apiClient.RenewCredential(d.credential.Base64)
if err != nil {
zap.L().Error("Renew the credential failed", zap.Error(err))
renewCredTimer = nextRenewTime()
continue
}
// Parse the credential
credential, err := base64.RawStdEncoding.DecodeString(res.Credential)
if err != nil {
zap.L().Error("Decode base64 credential failed", zap.Error(err), zap.String("credential", res.Credential))
renewCredTimer = nextRenewTime()
continue
}
d.credential.RawBytes = credential
d.credential.Base64 = res.Credential
d.credential.Lease = time.Duration(res.CredentialLease) * time.Second
d.credential.RenewedAt = time.Now()
d.rm.SetCredential(credential)
renewCredTimer = nextRenewTime()
}
}
}