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utils.go
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utils.go
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// Copyright 2021 FabEdge Team
//
// 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 agent
import (
"context"
"fmt"
"math"
"time"
"github.com/avast/retry-go"
sysctlutil "github.com/fabedge/fabedge/third_party/sysctl"
)
var sysctl = sysctlutil.New()
// retryForever retry fn until it succeed
func retryForever(ctx context.Context, retryableFunc retry.RetryableFunc, onRetryFunc retry.OnRetryFunc) {
_ = retry.Do(
retryableFunc,
retry.Context(ctx),
retry.Attempts(math.MaxUint32),
retry.Delay(5*time.Second),
retry.DelayType(retry.FixedDelay),
retry.LastErrorOnly(true),
retry.OnRetry(onRetryFunc),
)
}
// ensureSysctl sets a kernel sysctl to a given numeric value.
func ensureSysctl(name string, newVal int) error {
if oldVal, _ := sysctl.GetSysctl(name); oldVal != newVal {
if err := sysctl.SetSysctl(name, newVal); err != nil {
return fmt.Errorf("can't set sysctl %s to %d: %v", name, newVal, err)
}
}
return nil
}