Introduce BucketProvider interface

controllers/bucket_controller_fetch_test.go

@@ -0,0 +1,322 @@
+/*
+Copyright 2022 The Flux 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"
+	"fmt"
+	"os"
+	"path/filepath"
+	"testing"
+	"time"
+
+	"gotest.tools/assert"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+
+	sourcev1 "github.com/fluxcd/source-controller/api/v1beta2"
+)
+
+type mockBucketObject struct {
+	etag string
+	data string
+}
+
+type mockBucketClient struct {
+	bucketName string
+	objects    map[string]mockBucketObject
+}
+
+var mockNotFound = fmt.Errorf("not found")
+
+func (m mockBucketClient) BucketExists(_ context.Context, name string) (bool, error) {
+	return name == m.bucketName, nil
+}
+
+func (m mockBucketClient) FGetObject(_ context.Context, bucket, obj, path string) (string, error) {
+	if bucket != m.bucketName {
+		return "", fmt.Errorf("bucket does not exist")
+	}
+	// tiny bit of protocol, for convenience: if asked for an object "error", then return an error.
+	if obj == "error" {
+		return "", fmt.Errorf("I was asked to report an error")
+	}
+	object, ok := m.objects[obj]
+	if !ok {
+		return "", mockNotFound
+	}
+	if err := os.WriteFile(path, []byte(object.data), os.FileMode(0660)); err != nil {
+		return "", err
+	}
+	return object.etag, nil
+}
+
+func (m mockBucketClient) ObjectIsNotFound(e error) bool {
+	return e == mockNotFound
+}
+
+func (m mockBucketClient) VisitObjects(_ context.Context, _ string, f func(key, etag string) error) error {
+	for key, obj := range m.objects {
+		if err := f(key, obj.etag); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (m mockBucketClient) Close(_ context.Context) {
+	return
+}
+
+func (m *mockBucketClient) addObject(key string, object mockBucketObject) {
+	if m.objects == nil {
+		m.objects = make(map[string]mockBucketObject)
+	}
+	m.objects[key] = object
+}
+
+func (m *mockBucketClient) objectsToEtagIndex() *etagIndex {
+	i := newEtagIndex()
+	for k, v := range m.objects {
+		i.Add(k, v.etag)
+	}
+	return i
+}
+
+func Test_fetchEtagIndex(t *testing.T) {
+	bucketName := "all-my-config"
+
+	bucket := sourcev1.Bucket{
+		Spec: sourcev1.BucketSpec{
+			BucketName: bucketName,
+			Timeout:    &metav1.Duration{Duration: 1 * time.Hour},
+		},
+	}
+
+	t.Run("fetches etag index", func(t *testing.T) {
+		tmp, err := os.MkdirTemp("", "test-bucket")
+		if err != nil {
+			t.Fatal(err)
+		}
+		defer os.RemoveAll(tmp)
+
+		client := mockBucketClient{bucketName: bucketName}
+		client.addObject("foo.yaml", mockBucketObject{data: "foo.yaml", etag: "etag1"})
+		client.addObject("bar.yaml", mockBucketObject{data: "bar.yaml", etag: "etag2"})
+		client.addObject("baz.yaml", mockBucketObject{data: "baz.yaml", etag: "etag3"})
+
+		index := newEtagIndex()
+		err = fetchEtagIndex(context.TODO(), client, bucket.DeepCopy(), index, tmp)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		assert.Equal(t, index.Len(), 3)
+	})
+
+	t.Run("an error while bucket does not exist", func(t *testing.T) {
+		tmp, err := os.MkdirTemp("", "test-bucket")
+		if err != nil {
+			t.Fatal(err)
+		}
+		defer os.RemoveAll(tmp)
+
+		client := mockBucketClient{bucketName: "other-bucket-name"}
+
+		index := newEtagIndex()
+		err = fetchEtagIndex(context.TODO(), client, bucket.DeepCopy(), index, tmp)
+		assert.ErrorContains(t, err, "not found")
+	})
+
+	t.Run("filters with .sourceignore rules", func(t *testing.T) {
+		tmp, err := os.MkdirTemp("", "test-bucket")
+		if err != nil {
+			t.Fatal(err)
+		}
+		defer os.RemoveAll(tmp)
+
+		client := mockBucketClient{bucketName: bucketName}
+		client.addObject(".sourceignore", mockBucketObject{etag: "sourceignore1", data: `*.txt`})
+		client.addObject("foo.yaml", mockBucketObject{etag: "etag1", data: "foo.yaml"})
+		client.addObject("foo.txt", mockBucketObject{etag: "etag2", data: "foo.txt"})
+
+		index := newEtagIndex()
+		err = fetchEtagIndex(context.TODO(), client, bucket.DeepCopy(), index, tmp)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		if _, err := os.Stat(filepath.Join(tmp, ".sourceignore")); err != nil {
+			t.Error(err)
+		}
+
+		if ok := index.Has("foo.txt"); ok {
+			t.Error(fmt.Errorf("expected 'foo.txt' index item to not exist"))
+		}
+		assert.Equal(t, index.Len(), 1)
+	})
+
+	t.Run("filters with ignore rules from object", func(t *testing.T) {
+		tmp, err := os.MkdirTemp("", "test-bucket")
+		if err != nil {
+			t.Fatal(err)
+		}
+		defer os.RemoveAll(tmp)
+
+		client := mockBucketClient{bucketName: bucketName}
+		client.addObject(".sourceignore", mockBucketObject{etag: "sourceignore1", data: `*.txt`})
+		client.addObject("foo.txt", mockBucketObject{etag: "etag1", data: "foo.txt"})
+
+		ignore := "!*.txt"
+		bucket := bucket.DeepCopy()
+		bucket.Spec.Ignore = &ignore
+
+		index := newEtagIndex()
+		err = fetchEtagIndex(context.TODO(), client, bucket.DeepCopy(), index, tmp)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		if _, err := os.Stat(filepath.Join(tmp, ".sourceignore")); err != nil {
+			t.Error(err)
+		}
+
+		assert.Equal(t, index.Len(), 1)
+		if ok := index.Has("foo.txt"); !ok {
+			t.Error(fmt.Errorf("expected 'foo.txt' index item to exist"))
+		}
+	})
+}
+
+func Test_fetchFiles(t *testing.T) {
+	bucketName := "all-my-config"
+
+	bucket := sourcev1.Bucket{
+		Spec: sourcev1.BucketSpec{
+			BucketName: bucketName,
+			Timeout:    &metav1.Duration{Duration: 1 * time.Hour},
+		},
+	}
+
+	t.Run("fetches files", func(t *testing.T) {
+		tmp, err := os.MkdirTemp("", "test-bucket")
+		if err != nil {
+			t.Fatal(err)
+		}
+		defer os.RemoveAll(tmp)
+
+		client := mockBucketClient{bucketName: bucketName}
+		client.addObject("foo.yaml", mockBucketObject{data: "foo.yaml", etag: "etag1"})
+		client.addObject("bar.yaml", mockBucketObject{data: "bar.yaml", etag: "etag2"})
+		client.addObject("baz.yaml", mockBucketObject{data: "baz.yaml", etag: "etag3"})
+
+		index := client.objectsToEtagIndex()
+
+		err = fetchIndexFiles(context.TODO(), client, bucket.DeepCopy(), index, tmp)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		for path := range index.Index() {
+			p := filepath.Join(tmp, path)
+			_, err := os.Stat(p)
+			if err != nil {
+				t.Error(err)
+			}
+		}
+	})
+
+	t.Run("an error while fetching returns an error for the whole procedure", func(t *testing.T) {
+		tmp, err := os.MkdirTemp("", "test-bucket")
+		if err != nil {
+			t.Fatal(err)
+		}
+		defer os.RemoveAll(tmp)
+
+		client := mockBucketClient{bucketName: bucketName, objects: map[string]mockBucketObject{}}
+		client.objects["error"] = mockBucketObject{}
+
+		err = fetchIndexFiles(context.TODO(), client, bucket.DeepCopy(), client.objectsToEtagIndex(), tmp)
+		if err == nil {
+			t.Fatal("expected error but got nil")
+		}
+	})
+
+	t.Run("a changed etag updates the index", func(t *testing.T) {
+		tmp, err := os.MkdirTemp("", "test-bucket")
+		if err != nil {
+			t.Fatal(err)
+		}
+		defer os.RemoveAll(tmp)
+
+		client := mockBucketClient{bucketName: bucketName}
+		client.addObject("foo.yaml", mockBucketObject{data: "foo.yaml", etag: "etag2"})
+
+		index := newEtagIndex()
+		index.Add("foo.yaml", "etag1")
+		err = fetchIndexFiles(context.TODO(), client, bucket.DeepCopy(), index, tmp)
+		if err != nil {
+			t.Fatal(err)
+		}
+		f := index.Get("foo.yaml")
+		assert.Equal(t, f, "etag2")
+	})
+
+	t.Run("a disappeared index entry is removed from the index", func(t *testing.T) {
+		tmp, err := os.MkdirTemp("", "test-bucket")
+		if err != nil {
+			t.Fatal(err)
+		}
+		defer os.RemoveAll(tmp)
+
+		client := mockBucketClient{bucketName: bucketName}
+		client.addObject("foo.yaml", mockBucketObject{data: "foo.yaml", etag: "etag1"})
+
+		index := newEtagIndex()
+		index.Add("foo.yaml", "etag1")
+		// Does not exist on server
+		index.Add("bar.yaml", "etag2")
+
+		err = fetchIndexFiles(context.TODO(), client, bucket.DeepCopy(), index, tmp)
+		if err != nil {
+			t.Fatal(err)
+		}
+		f := index.Get("foo.yaml")
+		assert.Equal(t, f, "etag1")
+		assert.Check(t, !index.Has("bar.yaml"))
+	})
+
+	t.Run("can fetch more than maxConcurrentFetches", func(t *testing.T) {
+		// this will fail if, for example, the semaphore is not used correctly and blocks
+		tmp, err := os.MkdirTemp("", "test-bucket")
+		if err != nil {
+			t.Fatal(err)
+		}
+		defer os.RemoveAll(tmp)
+
+		client := mockBucketClient{bucketName: bucketName}
+		for i := 0; i < 2*maxConcurrentBucketFetches; i++ {
+			f := fmt.Sprintf("file-%d", i)
+			client.addObject(f, mockBucketObject{etag: f, data: f})
+		}
+		index := client.objectsToEtagIndex()
+
+		err = fetchIndexFiles(context.TODO(), client, bucket.DeepCopy(), index, tmp)
+		if err != nil {
+			t.Fatal(err)
+		}
+	})
+}