lazyloader_test.go

/*
Copyright 2021 The AlaudaDevops Authors.

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 controllers

import (
	"context"
	"errors"
	"testing"
	"time"

	. "github.com/onsi/gomega"
	"go.uber.org/zap"
	"sigs.k8s.io/controller-runtime/pkg/manager"
)

type mockChecker struct {
	name string
	err  error
}

func (m *mockChecker) Name() string {
	return m.name
}

func (m *mockChecker) CheckSetup(ctx context.Context, mgr manager.Manager, logger *zap.SugaredLogger) error {
	return m.err
}

func (m *mockChecker) Setup(ctx context.Context, mgr manager.Manager, logger *zap.SugaredLogger) error {
	return m.err
}

func (m *mockChecker) DependentCrdInstalled(ctx context.Context, logger *zap.SugaredLogger) (bool, error) {
	return true, nil
}

func TestControllerLazyLoader(t *testing.T) {
	g := NewGomegaWithT(t)
	ctx := context.Background()
	// cancel, _ := context.WithCancel(ctx)
	interval := 100 * time.Millisecond
	logger, _ := zap.NewProduction()
	sugar := logger.Sugar()

	// create a new lazy loader
	loader := NewLazyLoader(ctx, interval).(*controllerLazyLoader)

	// add a mock checker that will always fail
	checker1 := &mockChecker{name: "checker1", err: errors.New("failed to setup")}
	err := loader.LazyLoad(ctx, nil, sugar, checker1)
	g.Expect(err).To(BeNil())

	// add a mock checker that will always succeed
	checker2 := &mockChecker{name: "checker2", err: nil}
	err = loader.LazyLoad(ctx, nil, sugar, checker2)
	g.Expect(err).To(BeNil())

	// start the lazy loader
	done := make(chan struct{})
	go func() {
		err := loader.Start(ctx)
		g.Expect(err).To(BeNil())
		close(done)
	}()

	// wait for the first check to complete
	time.Sleep(2 * interval)

	g.Expect(len(loader.pending)).To(Equal(1))
	g.Expect(len(loader.done)).To(Equal(1))

	// wait for the second check to complete
	time.Sleep(2 * interval)

	g.Expect(len(loader.pending)).To(Equal(1))
	g.Expect(len(loader.done)).To(Equal(1))

	go func() {
		time.Sleep(10 * interval)
		<-ctx.Done()
	}()

}