/* Copyright 2015 The Kubernetes Authors. 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 kubelet import ( "errors" "fmt" "sync" "time" utilerrors "k8s.io/apimachinery/pkg/util/errors" ) type runtimeState struct { sync.RWMutex lastBaseRuntimeSync time.Time baseRuntimeSyncThreshold time.Duration networkError error storageError error cidr string healthChecks []*healthCheck } // A health check function should be efficient and not rely on external // components (e.g., container runtime). type healthCheckFnType func() (bool, error) type healthCheck struct { name string fn healthCheckFnType } func (s *runtimeState) addHealthCheck(name string, f healthCheckFnType) { s.Lock() defer s.Unlock() s.healthChecks = append(s.healthChecks, &healthCheck{name: name, fn: f}) } func (s *runtimeState) setRuntimeSync(t time.Time) { s.Lock() defer s.Unlock() s.lastBaseRuntimeSync = t } func (s *runtimeState) setNetworkState(err error) { s.Lock() defer s.Unlock() s.networkError = err } func (s *runtimeState) setStorageState(err error) { s.Lock() defer s.Unlock() s.storageError = err } func (s *runtimeState) setPodCIDR(cidr string) { s.Lock() defer s.Unlock() s.cidr = cidr } func (s *runtimeState) podCIDR() string { s.RLock() defer s.RUnlock() return s.cidr } func (s *runtimeState) runtimeErrors() error { s.RLock() defer s.RUnlock() errs := []error{} if s.lastBaseRuntimeSync.IsZero() { errs = append(errs, errors.New("container runtime status check may not have completed yet")) } else if !s.lastBaseRuntimeSync.Add(s.baseRuntimeSyncThreshold).After(time.Now()) { errs = append(errs, errors.New("container runtime is down")) } for _, hc := range s.healthChecks { if ok, err := hc.fn(); !ok { errs = append(errs, fmt.Errorf("%s is not healthy: %v", hc.name, err)) } } return utilerrors.NewAggregate(errs) } func (s *runtimeState) networkErrors() error { s.RLock() defer s.RUnlock() errs := []error{} if s.networkError != nil { errs = append(errs, s.networkError) } return utilerrors.NewAggregate(errs) } func (s *runtimeState) storageErrors() error { s.RLock() defer s.RUnlock() errs := []error{} if s.storageError != nil { errs = append(errs, s.storageError) } return utilerrors.NewAggregate(errs) } func newRuntimeState( runtimeSyncThreshold time.Duration, ) *runtimeState { return &runtimeState{ lastBaseRuntimeSync: time.Time{}, baseRuntimeSyncThreshold: runtimeSyncThreshold, networkError: ErrNetworkUnknown, } }