-
Notifications
You must be signed in to change notification settings - Fork 0
/
controller.go
186 lines (164 loc) · 6.36 KB
/
controller.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
package flinkapplication
import (
"context"
"github.com/lyft/flytestdlib/promutils"
"github.com/lyft/flytestdlib/promutils/labeled"
"github.com/lyft/flinkk8soperator/pkg/apis/app/v1beta1"
"github.com/lyft/flinkk8soperator/pkg/controller/config"
"sigs.k8s.io/controller-runtime/pkg/controller"
"time"
"github.com/lyft/flinkk8soperator/pkg/controller/k8"
"github.com/lyft/flytestdlib/contextutils"
"github.com/lyft/flytestdlib/logger"
v1 "k8s.io/api/apps/v1"
coreV1 "k8s.io/api/core/v1"
metaV1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/types"
"sigs.k8s.io/controller-runtime/pkg/cache"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/event"
"sigs.k8s.io/controller-runtime/pkg/handler"
"sigs.k8s.io/controller-runtime/pkg/manager"
"sigs.k8s.io/controller-runtime/pkg/predicate"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
"sigs.k8s.io/controller-runtime/pkg/source"
)
// ReconcileFlinkApplication reconciles a FlinkApplication resource
type ReconcileFlinkApplication struct {
client client.Client
cache cache.Cache
metrics *reconcilerMetrics
flinkStateMachine FlinkHandlerInterface
}
type reconcilerMetrics struct {
scope promutils.Scope
cacheHit labeled.Counter
cacheMiss labeled.Counter
reconcileError labeled.Counter
}
func newReconcilerMetrics(scope promutils.Scope) *reconcilerMetrics {
reconcilerScope := scope.NewSubScope("reconciler")
return &reconcilerMetrics{
scope: reconcilerScope,
cacheHit: labeled.NewCounter("cache_hit", "Flink application resource fetched from cache", reconcilerScope),
cacheMiss: labeled.NewCounter("cache_miss", "Flink application resource missing from cache", reconcilerScope),
reconcileError: labeled.NewCounter("reconcile_error", "Reconcile for application failed", reconcilerScope),
}
}
func (r *ReconcileFlinkApplication) getResource(ctx context.Context, key types.NamespacedName, obj runtime.Object) error {
err := r.cache.Get(ctx, key, obj)
if err != nil && k8.IsK8sObjectDoesNotExist(err) {
r.metrics.cacheMiss.Inc(ctx)
return r.client.Get(ctx, key, obj)
}
if err == nil {
r.metrics.cacheHit.Inc(ctx)
}
return err
}
// For failures, we do not want to retry immediately, as we want the underlying resource to recover.
// At the same time, we want to retry faster than the regular success interval.
func (r *ReconcileFlinkApplication) getFailureRetryInterval() time.Duration {
return config.GetConfig().ResyncPeriod.Duration / 2
}
func (r *ReconcileFlinkApplication) getReconcileResultForError(err error) reconcile.Result {
if err == nil {
return reconcile.Result{}
}
return reconcile.Result{
RequeueAfter: r.getFailureRetryInterval(),
}
}
func (r *ReconcileFlinkApplication) Reconcile(request reconcile.Request) (reconcile.Result, error) {
ctx := context.Background()
ctx = contextutils.WithNamespace(ctx, request.Namespace)
ctx = contextutils.WithAppName(ctx, request.Name)
typeMeta := metaV1.TypeMeta{
Kind: v1beta1.FlinkApplicationKind,
APIVersion: v1beta1.SchemeGroupVersion.String(),
}
// Fetch the FlinkApplication instance
instance := &v1beta1.FlinkApplication{
TypeMeta: typeMeta,
}
err := r.getResource(ctx, request.NamespacedName, instance)
if err != nil {
if k8.IsK8sObjectDoesNotExist(err) {
// Request object not found, could have been deleted after reconcile request.
// Return and don't requeue
return reconcile.Result{}, nil
}
// Error reading the object - we will check again in next loop
return r.getReconcileResultForError(err), nil
}
// We are seeing instances where getResource is removing TypeMeta
instance.TypeMeta = typeMeta
ctx = contextutils.WithPhase(ctx, string(instance.Status.Phase))
err = r.flinkStateMachine.Handle(ctx, instance)
if err != nil {
r.metrics.reconcileError.Inc(ctx)
logger.Warnf(ctx, "Failed to reconcile resource %v: %v", request.NamespacedName, err)
}
return r.getReconcileResultForError(err), err
}
// Add creates a new FlinkApplication Controller and adds it to the Manager. The Manager will set fields on the Controller
// and Start it when the Manager is Started.
func Add(ctx context.Context, mgr manager.Manager, cfg config.RuntimeConfig) error {
k8sCluster := k8.NewK8Cluster(mgr, cfg)
eventRecorder := mgr.GetEventRecorderFor(config.AppName)
flinkStateMachine := NewFlinkStateMachine(k8sCluster, eventRecorder, cfg)
metrics := newReconcilerMetrics(cfg.MetricsScope)
reconciler := ReconcileFlinkApplication{
client: mgr.GetClient(),
cache: mgr.GetCache(),
metrics: metrics,
flinkStateMachine: flinkStateMachine,
}
c, err := controller.New(config.AppName, mgr, controller.Options{
MaxConcurrentReconciles: config.GetConfig().Workers,
Reconciler: &reconciler,
})
if err != nil {
return err
}
if err = c.Watch(&source.Kind{Type: &v1beta1.FlinkApplication{}}, &handler.EnqueueRequestForObject{}); err != nil {
return err
}
// Watch deployments and services for the application
if err := c.Watch(&source.Kind{Type: &v1.Deployment{}}, &handler.Funcs{}, getPredicateFuncs()); err != nil {
return err
}
if err := c.Watch(&source.Kind{Type: &coreV1.Service{}}, &handler.Funcs{}, getPredicateFuncs()); err != nil {
return err
}
return nil
}
func isOwnedByFlinkApplication(ownerReferences []metaV1.OwnerReference) bool {
for _, ownerReference := range ownerReferences {
if ownerReference.APIVersion == v1beta1.SchemeGroupVersion.String() &&
ownerReference.Kind == v1beta1.FlinkApplicationKind {
return true
}
}
return false
}
// Predicate filters events before enqueuing the keys.
// We are only interested in kubernetes objects that are owned by the FlinkApplication
// This filters all the objects not owned by the flinkApplication, and ensures only subset reaches event handlers
func getPredicateFuncs() predicate.Funcs {
return predicate.Funcs{
CreateFunc: func(e event.CreateEvent) bool {
return isOwnedByFlinkApplication(e.Meta.GetOwnerReferences())
},
UpdateFunc: func(e event.UpdateEvent) bool {
return isOwnedByFlinkApplication(e.MetaNew.GetOwnerReferences())
},
DeleteFunc: func(e event.DeleteEvent) bool {
return isOwnedByFlinkApplication(e.Meta.GetOwnerReferences())
},
GenericFunc: func(e event.GenericEvent) bool {
return isOwnedByFlinkApplication(e.Meta.GetOwnerReferences())
},
}
}