-
Notifications
You must be signed in to change notification settings - Fork 6
/
eventrouter.go
executable file
·209 lines (177 loc) · 5.37 KB
/
eventrouter.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
// Copyright 2019 VMware, Inc. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
package events
import (
"reflect"
"strings"
"sync/atomic"
"time"
"github.com/wavefronthq/observability-for-kubernetes/collector/internal/configuration"
"github.com/wavefronthq/observability-for-kubernetes/collector/internal/events"
"github.com/wavefronthq/observability-for-kubernetes/collector/internal/leadership"
"github.com/wavefronthq/observability-for-kubernetes/collector/internal/util"
"github.com/wavefronthq/observability-for-kubernetes/collector/plugins/sinks"
"github.com/wavefronthq/wavefront-sdk-go/event"
gometrics "github.com/rcrowley/go-metrics"
log "github.com/sirupsen/logrus"
v1 "k8s.io/api/core/v1"
"k8s.io/client-go/informers"
"k8s.io/client-go/kubernetes"
corelisters "k8s.io/client-go/listers/core/v1"
"k8s.io/client-go/tools/cache"
)
var Log = log.WithField("system", "events")
var leadershipName = "eventRouter"
var filteredEvents = gometrics.GetOrRegisterCounter("events.filtered", gometrics.DefaultRegistry)
var receivedEvents = gometrics.GetOrRegisterCounter("events.received", gometrics.DefaultRegistry)
var sentEvents = gometrics.GetOrRegisterCounter("events.sent", gometrics.DefaultRegistry)
type EventRouter struct {
kubeClient kubernetes.Interface
eLister corelisters.EventLister
eListerSynced cache.InformerSynced
sink sinks.Sink
sharedInformers informers.SharedInformerFactory
stop chan struct{}
scrapeCluster bool
leadershipManager *leadership.Manager
filters eventFilter
clusterName string
clusterUUID string
workloadCache util.WorkloadCache
informerSynced atomic.Bool
annotator *EventAnnotator
}
func NewEventRouter(clientset kubernetes.Interface, cfg configuration.EventsConfig, sink sinks.Sink, scrapeCluster bool, workloadCache util.WorkloadCache) *EventRouter {
sharedInformers := informers.NewSharedInformerFactory(clientset, time.Minute)
eventsInformer := sharedInformers.Core().V1().Events()
er := &EventRouter{
kubeClient: clientset,
sink: sink,
scrapeCluster: scrapeCluster,
sharedInformers: sharedInformers,
filters: newEventFilter(cfg.Filters),
clusterName: cfg.ClusterName,
clusterUUID: cfg.ClusterUUID,
workloadCache: workloadCache,
annotator: NewEventAnnotator(workloadCache, cfg.ClusterName, cfg.ClusterUUID),
}
eventsInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: func(obj interface{}) {
er.addEvent(obj, !er.informerSynced.Load())
},
UpdateFunc: func(oldObj, newObj interface{}) {
if reflect.DeepEqual(oldObj, newObj) {
return
}
er.addEvent(newObj, false)
},
})
er.eLister = eventsInformer.Lister()
er.eListerSynced = eventsInformer.Informer().HasSynced
er.leadershipManager = leadership.NewManager(er, leadershipName, clientset)
return er
}
func (er *EventRouter) Start() {
if er.scrapeCluster {
er.leadershipManager.Start()
}
}
func (er *EventRouter) Resume() {
er.stop = make(chan struct{})
Log.Infof("Starting EventRouter")
go func() { er.sharedInformers.Start(er.stop) }()
// here is where we kick the caches into gear
if !cache.WaitForCacheSync(er.stop, er.eListerSynced) {
log.Error("timed out waiting for caches to sync")
return
}
er.informerSynced.Store(true)
<-er.stop
Log.Infof("Shutting down EventRouter")
}
func (er *EventRouter) Pause() {
if er.stop != nil {
close(er.stop)
}
}
func (er *EventRouter) Stop() {
if er.scrapeCluster {
er.leadershipManager.Stop()
}
er.Pause()
}
// addEvent is called when an event is created, or during the initial list
func (er *EventRouter) addEvent(obj interface{}, isInInitialList bool) {
if isInInitialList {
return
}
e, ok := obj.(*v1.Event)
if !ok {
return // prevent unlikely panic
}
e = e.DeepCopy()
er.annotator.annotate(e)
ns := e.InvolvedObject.Namespace
if len(ns) == 0 {
ns = "default"
}
var component string
if len(e.Source.Component) > 0 {
component = e.Source.Component
} else {
component = e.ReportingController
}
tags := map[string]string{
"namespace_name": ns,
"kind": e.InvolvedObject.Kind,
"reason": e.Reason,
"component": component,
"type": e.Type,
"important": e.Annotations["important"],
}
resourceName := e.InvolvedObject.Name
if resourceName != "" {
if strings.ToLower(e.InvolvedObject.Kind) == "pod" {
tags["pod_name"] = resourceName
} else {
tags["resource_name"] = resourceName
}
}
receivedEvents.Inc(1)
if !er.filters.matches(tags) {
if log.IsLevelEnabled(log.TraceLevel) {
Log.WithField("event", e.Message).Trace("Dropping event")
}
filteredEvents.Inc(1)
return
}
delete(e.Annotations, "important")
delete(tags, "important")
sentEvents.Inc(1)
var lastTimestamp time.Time
if e.LastTimestamp.IsZero() {
lastTimestamp = e.EventTime.Time
} else {
lastTimestamp = e.LastTimestamp.Time
}
er.sink.ExportEvent(newEvent(
e.Message,
lastTimestamp,
e.Source.Host,
tags,
*e,
))
}
func newEvent(message string, ts time.Time, host string, tags map[string]string, coreV1Event v1.Event, options ...event.Option) *events.Event {
// convert tags to annotations
for k, v := range tags {
options = append(options, event.Annotate(k, v))
}
return &events.Event{
Message: message,
Ts: ts,
Host: host,
Options: options,
Event: coreV1Event,
}
}