Add first version of node-problem-detector

pkg/types/types.go

@@ -0,0 +1,78 @@
+/*
+Copyright 2016 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 types
+
+import (
+	"time"
+)
+
+// The following types are used internally in problem detector. In the future this could be the
+// interface between node problem detector and other problem daemons.
+// We added these types because:
+// 1) The kubernetes api packages are too heavy.
+// 2) We want to make the interface independent with kubernetes api change.
+
+// Severity is the severity of the problem event. Now we only have 2 severity levels: Info and Warn,
+// which are corresponding to the current kubernetes event types. We may want to add more severity
+// levels in the future.
+type Severity string
+
+const (
+	// Info is translated to a normal event.
+	Info Severity = "info"
+	// Warn is translated to a warning event.
+	Warn Severity = "warn"
+)
+
+// Condition is the node condition used internally by problem detector.
+type Condition struct {
+	// Type is the condition type. It should describe the condition of node in problem. For example
+	// KernelDeadlock, OutOfResource etc.
+	Type string `json:"type"`
+	// Status indicates whether the node is in the condition or not.
+	Status bool `json:"status"`
+	// Transition is the time when the node transits to this condition.
+	Transition time.Time `json:"transition"`
+	// Reason is a short reason of why node goes into this condition.
+	Reason string `json:"reason"`
+	// Message is a human readable message of why node goes into this condition.
+	Message string `json:"message"`
+}
+
+// Event is the event used internally by node problem detector.
+type Event struct {
+	// Severity is the severity level of the event.
+	Severity Severity `json:"severity"`
+	// Timestamp is the time when the event is generated.
+	Timestamp time.Time `json:"timestamp"`
+	// Reason is a short reason of why the event is generated.
+	Reason string `json:"reason"`
+	// Message is a human readable message of why the event is generated.
+	Message string `json:"message"`
+}
+
+// Status is the status other problem daemons should report to node problem detector.
+type Status struct {
+	// Source is the name of the problem daemon.
+	Source string `json:"source"`
+	// Event is the temporary node problem event. If the status is only a condition update,
+	// this field could be nil.
+	Event *Event `json:"event"`
+	// Condition is the permanent node condition. The problem daemon should always report the
+	// newest node condition in this field.
+	Condition Condition `json:"condition"`
+}