/
reconciler.go
127 lines (115 loc) · 3.03 KB
/
reconciler.go
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//
// Copyright (C) 2019-2020 Vdaas.org Vald team ( kpango, rinx, kmrmt )
//
// 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
//
// https://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 k8s provides kubernetes control functionality
package k8s
import (
"context"
"reflect"
"github.com/vdaas/vald/internal/errgroup"
"github.com/vdaas/vald/internal/errors"
"github.com/vdaas/vald/internal/safety"
"k8s.io/apimachinery/pkg/runtime"
"sigs.k8s.io/controller-runtime/pkg/builder"
"sigs.k8s.io/controller-runtime/pkg/client/config"
"sigs.k8s.io/controller-runtime/pkg/handler"
"sigs.k8s.io/controller-runtime/pkg/manager"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
"sigs.k8s.io/controller-runtime/pkg/source"
)
type Controller interface {
Start(ctx context.Context) (<-chan error, error)
}
type ResourceController interface {
GetName() string
NewReconciler(ctx context.Context, mgr manager.Manager) reconcile.Reconciler
For() runtime.Object
Owns() runtime.Object
Watches() (*source.Kind, handler.EventHandler)
}
type controller struct {
eg errgroup.Group
name string
merticsAddr string
leaderElection bool
mgr manager.Manager
rcs []ResourceController
}
func New(opts ...Option) (cl Controller, err error) {
c := new(controller)
for _, opt := range append(defaultOpts, opts...) {
if err := opt(c); err != nil {
return nil, errors.ErrOptionFailed(err, reflect.ValueOf(opt))
}
}
if c.mgr == nil {
cfg, err := config.GetConfig()
if err != nil {
return nil, err
}
if cfg == nil {
return nil, errors.ErrInvalidReconcilerConfig
}
c.mgr, err = manager.New(
cfg,
manager.Options{
Scheme: runtime.NewScheme(),
LeaderElection: c.leaderElection,
MetricsBindAddress: c.merticsAddr,
},
)
if err != nil {
return nil, err
}
}
return c, nil
}
func (c *controller) Start(ctx context.Context) (<-chan error, error) {
var err error
for _, rc := range c.rcs {
if rc != nil {
bc := builder.ControllerManagedBy(c.mgr).Named(rc.GetName())
f := rc.For()
if f != nil {
bc = bc.For(f)
}
o := rc.Owns()
if o != nil {
bc = bc.Owns(o)
}
src, h := rc.Watches()
if src != nil {
if h == nil {
h = &handler.EnqueueRequestForObject{}
}
bc = bc.Watches(src, h)
}
_, err = bc.Build(rc.NewReconciler(ctx, c.mgr))
if err != nil {
return nil, err
}
}
}
ech := make(chan error, 1)
c.eg.Go(safety.RecoverFunc(func() error {
defer close(ech)
err := c.mgr.Start(ctx.Done())
if err != nil {
ech <- err
}
return nil
}))
return ech, nil
}