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Introduce artifact max size limit of 50MiB
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Add a controller flag named "--artifact-max-size=<bytes>" with the default value of 50MiB.
To disable the limit, the value can be set to "--artifact-max-size=-1".
The flag enforces a max size limit for the artifact contents produced by source-controller,
to avoid out-of-memory crashes of consumers such as kustomize-controller.

Signed-off-by: Stefan Prodan <stefan.prodan@gmail.com>
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@stefanprodan
stefanprodan committed Oct 11, 2022
1 parent 34f127b commit af969cf
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Showing 6 changed files with 120 additions and 19 deletions.
6 changes: 3 additions & 3 deletions controllers/helmchart_controller_test.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -421,7 +421,7 @@ func TestHelmChartReconciler_reconcileSource(t *testing.T) {

tmpDir := t.TempDir()

storage, err := NewStorage(tmpDir, "example.com", retentionTTL, retentionRecords)
storage, err := NewStorage(tmpDir, "example.com", retentionTTL, retentionRecords, 0)
g.Expect(err).ToNot(HaveOccurred())

gitArtifact := &sourcev1.Artifact{
Expand Down Expand Up @@ -901,7 +901,7 @@ func TestHelmChartReconciler_buildFromOCIHelmRepository(t *testing.T) {
metadata, err := loadTestChartToOCI(chartData, chartPath, testRegistryServer)
g.Expect(err).NotTo(HaveOccurred())

storage, err := NewStorage(tmpDir, "example.com", retentionTTL, retentionRecords)
storage, err := NewStorage(tmpDir, "example.com", retentionTTL, retentionRecords, 0)
g.Expect(err).ToNot(HaveOccurred())

cachedArtifact := &sourcev1.Artifact{
Expand Down Expand Up @@ -1118,7 +1118,7 @@ func TestHelmChartReconciler_buildFromTarballArtifact(t *testing.T) {

tmpDir := t.TempDir()

storage, err := NewStorage(tmpDir, "example.com", retentionTTL, retentionRecords)
storage, err := NewStorage(tmpDir, "example.com", retentionTTL, retentionRecords, 0)
g.Expect(err).ToNot(HaveOccurred())

chartsArtifact := &sourcev1.Artifact{
Expand Down
12 changes: 11 additions & 1 deletion controllers/storage.go
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Original file line number Diff line number Diff line change
Expand Up @@ -61,10 +61,14 @@ type Storage struct {
// ArtifactRetentionRecords is the maximum number of artifacts to be kept in
// storage after a garbage collection.
ArtifactRetentionRecords int `json:"artifactRetentionRecords"`

// ArtifactMaxSize sets the max size in bytes for an artifact contents.
// Setting the value to zero or a negative value, disables the limit.
ArtifactMaxSize int64 `json:"artifactMaxSize"`
}

// NewStorage creates the storage helper for a given path and hostname.
func NewStorage(basePath string, hostname string, artifactRetentionTTL time.Duration, artifactRetentionRecords int) (*Storage, error) {
func NewStorage(basePath string, hostname string, artifactRetentionTTL time.Duration, artifactRetentionRecords int, artifactMaxSize int64) (*Storage, error) {
if f, err := os.Stat(basePath); os.IsNotExist(err) || !f.IsDir() {
return nil, fmt.Errorf("invalid dir path: %s", basePath)
}
Expand All @@ -73,6 +77,7 @@ func NewStorage(basePath string, hostname string, artifactRetentionTTL time.Dura
Hostname: hostname,
ArtifactRetentionTTL: artifactRetentionTTL,
ArtifactRetentionRecords: artifactRetentionRecords,
ArtifactMaxSize: artifactMaxSize,
}, nil
}

Expand Down Expand Up @@ -432,6 +437,11 @@ func (s *Storage) Archive(artifact *sourcev1.Artifact, dir string, filter Archiv
return err
}

if s.ArtifactMaxSize > 0 && sz.written > s.ArtifactMaxSize {
return fmt.Errorf("artifact size %d exceeds the max limit of %d bytes, use .sourceignore to exclude files from the artifact",
sz.written, s.ArtifactMaxSize)
}

if err := os.Chmod(tmpName, 0o600); err != nil {
return err
}
Expand Down
107 changes: 97 additions & 10 deletions controllers/storage_test.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -38,7 +38,7 @@ import (
func TestStorageConstructor(t *testing.T) {
dir := t.TempDir()

if _, err := NewStorage("/nonexistent", "hostname", time.Minute, 2); err == nil {
if _, err := NewStorage("/nonexistent", "hostname", time.Minute, 2, 0); err == nil {
t.Fatal("nonexistent path was allowable in storage constructor")
}

Expand All @@ -48,13 +48,13 @@ func TestStorageConstructor(t *testing.T) {
}
f.Close()

if _, err := NewStorage(f.Name(), "hostname", time.Minute, 2); err == nil {
if _, err := NewStorage(f.Name(), "hostname", time.Minute, 2, 0); err == nil {
os.Remove(f.Name())
t.Fatal("file path was accepted as basedir")
}
os.Remove(f.Name())

if _, err := NewStorage(dir, "hostname", time.Minute, 2); err != nil {
if _, err := NewStorage(dir, "hostname", time.Minute, 2, 0); err != nil {
t.Fatalf("Valid path did not successfully return: %v", err)
}
}
Expand Down Expand Up @@ -103,7 +103,7 @@ func walkTar(tarFile string, match string, dir bool) (int64, bool, error) {
func TestStorage_Archive(t *testing.T) {
dir := t.TempDir()

storage, err := NewStorage(dir, "hostname", time.Minute, 2)
storage, err := NewStorage(dir, "hostname", time.Minute, 2, 0)
if err != nil {
t.Fatalf("error while bootstrapping storage: %v", err)
}
Expand Down Expand Up @@ -263,7 +263,7 @@ func TestStorageRemoveAllButCurrent(t *testing.T) {
t.Run("bad directory in archive", func(t *testing.T) {
dir := t.TempDir()

s, err := NewStorage(dir, "hostname", time.Minute, 2)
s, err := NewStorage(dir, "hostname", time.Minute, 2, 0)
if err != nil {
t.Fatalf("Valid path did not successfully return: %v", err)
}
Expand All @@ -277,7 +277,7 @@ func TestStorageRemoveAllButCurrent(t *testing.T) {
g := NewWithT(t)
dir := t.TempDir()

s, err := NewStorage(dir, "hostname", time.Minute, 2)
s, err := NewStorage(dir, "hostname", time.Minute, 2, 0)
g.Expect(err).ToNot(HaveOccurred(), "failed to create new storage")

artifact := sourcev1.Artifact{
Expand Down Expand Up @@ -338,7 +338,7 @@ func TestStorageRemoveAll(t *testing.T) {
g := NewWithT(t)
dir := t.TempDir()

s, err := NewStorage(dir, "hostname", time.Minute, 2)
s, err := NewStorage(dir, "hostname", time.Minute, 2, 0)
g.Expect(err).ToNot(HaveOccurred(), "failed to create new storage")

artifact := sourcev1.Artifact{
Expand All @@ -364,7 +364,7 @@ func TestStorageCopyFromPath(t *testing.T) {

dir := t.TempDir()

storage, err := NewStorage(dir, "hostname", time.Minute, 2)
storage, err := NewStorage(dir, "hostname", time.Minute, 2, 0)
if err != nil {
t.Fatalf("error while bootstrapping storage: %v", err)
}
Expand Down Expand Up @@ -542,7 +542,7 @@ func TestStorage_getGarbageFiles(t *testing.T) {
g := NewWithT(t)
dir := t.TempDir()

s, err := NewStorage(dir, "hostname", tt.ttl, tt.maxItemsToBeRetained)
s, err := NewStorage(dir, "hostname", tt.ttl, tt.maxItemsToBeRetained, 0)
g.Expect(err).ToNot(HaveOccurred(), "failed to create new storage")

artifact := sourcev1.Artifact{
Expand Down Expand Up @@ -616,7 +616,7 @@ func TestStorage_GarbageCollect(t *testing.T) {
g := NewWithT(t)
dir := t.TempDir()

s, err := NewStorage(dir, "hostname", time.Second*2, 2)
s, err := NewStorage(dir, "hostname", time.Second*2, 2, 0)
g.Expect(err).ToNot(HaveOccurred(), "failed to create new storage")

artifact := sourcev1.Artifact{
Expand Down Expand Up @@ -658,3 +658,90 @@ func TestStorage_GarbageCollect(t *testing.T) {
})
}
}

func TestStorage_MaxSize(t *testing.T) {
createFiles := func(files map[string][]byte) (dir string, err error) {
dir = t.TempDir()
for name, b := range files {
absPath := filepath.Join(dir, name)
if err = os.MkdirAll(filepath.Dir(absPath), 0o750); err != nil {
return
}
f, err := os.Create(absPath)
if err != nil {
return "", fmt.Errorf("could not create file %q: %w", absPath, err)
}
if n, err := f.Write(b); err != nil {
f.Close()
return "", fmt.Errorf("could not write %d bytes to file %q: %w", n, f.Name(), err)
}
f.Close()
}
return
}

tests := []struct {
name string
files map[string][]byte
maxSize int64
wantErrMatch string
}{
{
name: "creates artifact without size limit",
files: map[string][]byte{
"test.txt": []byte(`contents`),
"test.yaml": []byte(`a: b`),
},
maxSize: -1,
wantErrMatch: "",
},
{
name: "fails to create artifact due to size limit",
files: map[string][]byte{
"test.txt": []byte(`contents`),
"test.yaml": []byte(`a: b`),
},
maxSize: 200,
wantErrMatch: "exceeds the max limit",
},
{
name: "creates artifact in the size limit range",
files: map[string][]byte{
"test.txt": []byte(`contents`),
"test.yaml": []byte(`a: b`),
},
maxSize: 300,
},
}

for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
g := NewWithT(t)

dir, err := createFiles(tt.files)
if err != nil {
t.Error(err)
return
}
defer os.RemoveAll(dir)

artifact := sourcev1.Artifact{
Path: filepath.Join(randStringRunes(10), randStringRunes(10), randStringRunes(10)+".tar.gz"),
}

s, err := NewStorage(dir, "hostname", time.Second*2, 2, tt.maxSize)
g.Expect(err).ToNot(HaveOccurred(), "failed to create new storage")

if err := s.MkdirAll(artifact); err != nil {
t.Fatalf("artifact directory creation failed: %v", err)
}

err = s.Archive(&artifact, dir, SourceIgnoreFilter(nil, nil))
if tt.wantErrMatch == "" {
g.Expect(err).ToNot(HaveOccurred())
} else {
g.Expect(err.Error()).To(ContainSubstring(tt.wantErrMatch))
}
})
}
}
2 changes: 1 addition & 1 deletion controllers/suite_test.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -354,7 +354,7 @@ func initTestTLS() {
}

func newTestStorage(s *testserver.HTTPServer) (*Storage, error) {
storage, err := NewStorage(s.Root(), s.URL(), retentionTTL, retentionRecords)
storage, err := NewStorage(s.Root(), s.URL(), retentionTTL, retentionRecords, 0)
if err != nil {
return nil, err
}
Expand Down
10 changes: 7 additions & 3 deletions main.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -54,6 +54,7 @@ import (
)

const controllerName = "source-controller"
const artifactMaxSizeDefault int64 = 50 << 20

var (
scheme = runtime.NewScheme()
Expand Down Expand Up @@ -101,6 +102,7 @@ func main() {
helmCachePurgeInterval string
artifactRetentionTTL time.Duration
artifactRetentionRecords int
artifactMaxSize int64
)

flag.StringVar(&metricsAddr, "metrics-addr", envOrDefault("METRICS_ADDR", ":8080"),
Expand Down Expand Up @@ -139,6 +141,8 @@ func main() {
"The duration of time that artifacts will be kept in storage before being garbage collected.")
flag.IntVar(&artifactRetentionRecords, "artifact-retention-records", 2,
"The maximum number of artifacts to be kept in storage after a garbage collection.")
flag.Int64Var(&artifactMaxSize, "artifact-max-size", artifactMaxSizeDefault,
"The max allowed size in bytes of an artifact contents produced from sources. The limit can be disabled by setting the value to zero or a negative value.")

clientOptions.BindFlags(flag.CommandLine)
logOptions.BindFlags(flag.CommandLine)
Expand Down Expand Up @@ -202,7 +206,7 @@ func main() {
if storageAdvAddr == "" {
storageAdvAddr = determineAdvStorageAddr(storageAddr, setupLog)
}
storage := mustInitStorage(storagePath, storageAdvAddr, artifactRetentionTTL, artifactRetentionRecords, setupLog)
storage := mustInitStorage(storagePath, storageAdvAddr, artifactRetentionTTL, artifactRetentionRecords, artifactMaxSize, setupLog)

if err = managed.InitManagedTransport(); err != nil {
// Log the error, but don't exit so as to not block reconcilers that are healthy.
Expand Down Expand Up @@ -350,14 +354,14 @@ func startFileServer(path string, address string, l logr.Logger) {
}
}

func mustInitStorage(path string, storageAdvAddr string, artifactRetentionTTL time.Duration, artifactRetentionRecords int, l logr.Logger) *controllers.Storage {
func mustInitStorage(path string, storageAdvAddr string, artifactRetentionTTL time.Duration, artifactRetentionRecords int, artifactMaxSize int64, l logr.Logger) *controllers.Storage {
if path == "" {
p, _ := os.Getwd()
path = filepath.Join(p, "bin")
os.MkdirAll(path, 0o700)
}

storage, err := controllers.NewStorage(path, storageAdvAddr, artifactRetentionTTL, artifactRetentionRecords)
storage, err := controllers.NewStorage(path, storageAdvAddr, artifactRetentionTTL, artifactRetentionRecords, artifactMaxSize)
if err != nil {
l.Error(err, "unable to initialise storage")
os.Exit(1)
Expand Down
2 changes: 1 addition & 1 deletion tests/fuzz/gitrepository_fuzzer.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -174,7 +174,7 @@ func startEnvServer(setupReconcilers func(manager.Manager)) *envtest.Environment
panic(err)
}
defer os.RemoveAll(tmpStoragePath)
storage, err = controllers.NewStorage(tmpStoragePath, "localhost:5050", time.Minute*1, 2)
storage, err = controllers.NewStorage(tmpStoragePath, "localhost:5050", time.Minute*1, 2, 0)
if err != nil {
panic(err)
}
Expand Down

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