Refactoring kubelet to separate object creation from object logical initialization.

pkg/kubelet/runtime.go

@@ -0,0 +1,74 @@
+/*
+Copyright 2015 The Kubernetes Authors All rights reserved.
+
+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 (
+	"sync"
+	"time"
+)
+
+type runtimeState struct {
+	sync.Mutex
+	lastBaseRuntimeSync      time.Time
+	baseRuntimeSyncThreshold time.Duration
+	networkError             error
+	initError                error
+}
+
+func (s *runtimeState) setRuntimeSync(t time.Time) {
+	s.Lock()
+	defer s.Unlock()
+	s.lastBaseRuntimeSync = t
+}
+
+func (s *runtimeState) setNetworkError(err error) {
+	if err == nil {
+		return
+	}
+	s.Lock()
+	defer s.Unlock()
+	s.networkError = err
+}
+
+func (s *runtimeState) setInitError(err error) {
+	s.Lock()
+	defer s.Unlock()
+	s.initError = err
+}
+
+func (s *runtimeState) errors() []string {
+	s.Lock()
+	defer s.Unlock()
+	var ret []string
+	if s.initError != nil {
+		ret = append(ret, s.initError.Error())
+	}
+	if s.networkError != nil {
+		ret = append(ret, s.networkError.Error())
+	}
+	if !s.lastBaseRuntimeSync.Add(s.baseRuntimeSyncThreshold).After(time.Now()) {
+		ret = append(ret, "container runtime is down")
+	}
+	return ret
+}
+
+func newRuntimeState(runtimeSyncThreshold time.Duration) *runtimeState {
+	return &runtimeState{
+		lastBaseRuntimeSync:      time.Time{},
+		baseRuntimeSyncThreshold: runtimeSyncThreshold,
+	}
+}