diff --git a/gcs-fake-service-account.json b/gcs-fake-service-account.json new file mode 100644 index 0000000..95ca5ab --- /dev/null +++ b/gcs-fake-service-account.json @@ -0,0 +1,9 @@ +{ + "type": "service_account", + "private_key_id": "abc", + "private_key": "-----BEGIN PRIVATE KEY-----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\nNtBLSfcqPULqD+h7br9lEJio\n-----END PRIVATE KEY-----\n", + "client_email": "123-abc@developer.gserviceaccount.com", + "client_id": "123-abc.apps.googleusercontent.com", + "auth_uri": "https://accounts.google.com/o/oauth2/auth", + "token_uri": "http://localhost:8080/token" +} diff --git a/gcs.go b/gcs.go new file mode 100644 index 0000000..a978735 --- /dev/null +++ b/gcs.go @@ -0,0 +1,113 @@ +// Copyright © 2021 Vasily Ovchinnikov . +// +// The code in this file is derived from afero fork github.com/Zatte/afero by Mikael Rapp +// licensed under Apache License 2.0. +// +// 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 afero + +import ( + "context" + "os" + "time" + + "cloud.google.com/go/storage" + "github.com/googleapis/google-cloud-go-testing/storage/stiface" + "github.com/spf13/afero/gcsfs" + "google.golang.org/api/option" +) + +type GcsFs struct { + source *gcsfs.GcsFs +} + +// Creates a GCS file system, automatically instantiating and decorating the storage client. +// You can provide additional options to be passed to the client creation, as per +// cloud.google.com/go/storage documentation +func NewGcsFS(ctx context.Context, bucketName string, opts ...option.ClientOption) (Fs, error) { + client, err := storage.NewClient(ctx, opts...) + if err != nil { + return nil, err + } + + return NewGcsFSFromClient(ctx, client, bucketName) +} + +// The same as NewGcsFS, but the files system will use the provided folder separator. +func NewGcsFSWithSeparator(ctx context.Context, bucketName, folderSeparator string, opts ...option.ClientOption) (Fs, error) { + client, err := storage.NewClient(ctx, opts...) + if err != nil { + return nil, err + } + + return NewGcsFSFromClientWithSeparator(ctx, client, bucketName, folderSeparator) +} + +// Creates a GCS file system from a given storage client +func NewGcsFSFromClient(ctx context.Context, client *storage.Client, bucketName string) (Fs, error) { + c := stiface.AdaptClient(client) + + bucket := c.Bucket(bucketName) + + return &GcsFs{gcsfs.NewGcsFs(ctx, bucket)}, nil +} + +// Same as NewGcsFSFromClient, but the file system will use the provided folder separator. +func NewGcsFSFromClientWithSeparator(ctx context.Context, client *storage.Client, bucketName, folderSeparator string) (Fs, error) { + c := stiface.AdaptClient(client) + + bucket := c.Bucket(bucketName) + + return &GcsFs{gcsfs.NewGcsFsWithSeparator(ctx, bucket, folderSeparator)}, nil +} + +// Wraps gcs.GcsFs and convert some return types to afero interfaces. +func (fs *GcsFs) Name() string { + return fs.source.Name() +} +func (fs *GcsFs) Create(name string) (File, error) { + return fs.source.Create(name) +} +func (fs *GcsFs) Mkdir(name string, perm os.FileMode) error { + return fs.source.Mkdir(name, perm) +} +func (fs *GcsFs) MkdirAll(path string, perm os.FileMode) error { + return fs.source.MkdirAll(path, perm) +} +func (fs *GcsFs) Open(name string) (File, error) { + return fs.source.Open(name) +} +func (fs *GcsFs) OpenFile(name string, flag int, perm os.FileMode) (File, error) { + return fs.source.OpenFile(name, flag, perm) +} +func (fs *GcsFs) Remove(name string) error { + return fs.source.Remove(name) +} +func (fs *GcsFs) RemoveAll(path string) error { + return fs.source.RemoveAll(path) +} +func (fs *GcsFs) Rename(oldname, newname string) error { + return fs.source.Rename(oldname, newname) +} +func (fs *GcsFs) Stat(name string) (os.FileInfo, error) { + return fs.source.Stat(name) +} +func (fs *GcsFs) Chmod(name string, mode os.FileMode) error { + return fs.source.Chmod(name, mode) +} +func (fs *GcsFs) Chtimes(name string, atime time.Time, mtime time.Time) error { + return fs.source.Chtimes(name, atime, mtime) +} +func (fs *GcsFs) Chown(name string, uid, gid int) error { + return fs.source.Chown(name, uid, gid) +} diff --git a/gcs_mocks.go b/gcs_mocks.go new file mode 100644 index 0000000..2d6928e --- /dev/null +++ b/gcs_mocks.go @@ -0,0 +1,255 @@ +// Copyright © 2021 Vasily Ovchinnikov . +// +// A set of stiface-based mocks, replicating the GCS behavior, to make the tests not require any +// internet connection or real buckets. +// It is **not** a comprehensive set of mocks to test anything and everything GCS-related, rather +// a very tailored one for the current implementation - thus the tests, written with the use of +// these mocks are more of regression ones. +// If any GCS behavior changes and breaks the implementation, then it should first be adjusted by +// switching over to a real bucket - and then the mocks have to be adjusted to match the +// implementation. + +package afero + +import ( + "context" + "io" + "os" + "strings" + + "github.com/spf13/afero/gcsfs" + + "cloud.google.com/go/storage" + "github.com/googleapis/google-cloud-go-testing/storage/stiface" + "google.golang.org/api/iterator" +) + +// sets filesystem separators to the one, expected (and hard-coded) in the tests +func normSeparators(s string) string { + return strings.Replace(s, "\\", "/", -1) +} + +type clientMock struct { + stiface.Client + fs Fs +} + +func newClientMock() *clientMock { + return &clientMock{fs: NewMemMapFs()} +} + +func (m *clientMock) Bucket(name string) stiface.BucketHandle { + return &bucketMock{bucketName: name, fs: m.fs} +} + +type bucketMock struct { + stiface.BucketHandle + + bucketName string + + fs Fs +} + +func (m *bucketMock) Object(name string) stiface.ObjectHandle { + return &objectMock{name: name, fs: m.fs} +} + +func (m *bucketMock) Objects(_ context.Context, q *storage.Query) (it stiface.ObjectIterator) { + return &objectItMock{name: q.Prefix, fs: m.fs} +} + +type objectMock struct { + stiface.ObjectHandle + + name string + fs Fs +} + +func (o *objectMock) NewWriter(_ context.Context) stiface.Writer { + return &writerMock{name: o.name, fs: o.fs} +} + +func (o *objectMock) NewRangeReader(_ context.Context, offset, length int64) (stiface.Reader, error) { + if o.name == "" { + return nil, gcsfs.ErrEmptyObjectName + } + + file, err := o.fs.Open(o.name) + if err != nil { + return nil, err + } + + if offset > 0 { + _, err = file.Seek(offset, io.SeekStart) + if err != nil { + return nil, err + } + } + + res := &readerMock{file: file} + if length > -1 { + res.buf = make([]byte, length) + _, err = file.Read(res.buf) + if err != nil { + return nil, err + } + } + + return res, nil +} + +func (o *objectMock) Delete(_ context.Context) error { + if o.name == "" { + return gcsfs.ErrEmptyObjectName + } + return o.fs.Remove(o.name) +} + +func (o *objectMock) Attrs(_ context.Context) (*storage.ObjectAttrs, error) { + if o.name == "" { + return nil, gcsfs.ErrEmptyObjectName + } + + info, err := o.fs.Stat(o.name) + if err != nil { + pathError, ok := err.(*os.PathError) + if ok { + if pathError.Err == os.ErrNotExist { + return nil, storage.ErrObjectNotExist + } + } + + return nil, err + } + + res := &storage.ObjectAttrs{Name: normSeparators(o.name), Size: info.Size(), Updated: info.ModTime()} + + if info.IsDir() { + // we have to mock it here, because of FileInfo logic + return nil, gcsfs.ErrObjectDoesNotExist + } + + return res, nil +} + +type writerMock struct { + stiface.Writer + + name string + fs Fs + + file File +} + +func (w *writerMock) Write(p []byte) (n int, err error) { + if w.file == nil { + w.file, err = w.fs.Create(w.name) + if err != nil { + return 0, err + } + } + + return w.file.Write(p) +} + +func (w *writerMock) Close() error { + if w.file == nil { + var err error + if strings.HasSuffix(w.name, "/") { + err = w.fs.Mkdir(w.name, 0755) + if err != nil { + return err + } + } else { + _, err = w.Write([]byte{}) + if err != nil { + return err + } + } + } + if w.file != nil { + return w.file.Close() + } + return nil +} + +type readerMock struct { + stiface.Reader + + file File + + buf []byte +} + +func (r *readerMock) Remain() int64 { + return 0 +} + +func (r *readerMock) Read(p []byte) (int, error) { + if r.buf != nil { + copy(p, r.buf) + return len(r.buf), nil + } + return r.file.Read(p) +} + +type objectItMock struct { + stiface.ObjectIterator + + name string + fs Fs + + dir File + infos []*storage.ObjectAttrs +} + +func (it *objectItMock) Next() (*storage.ObjectAttrs, error) { + var err error + if it.dir == nil { + it.dir, err = it.fs.Open(it.name) + if err != nil { + return nil, err + } + + var isDir bool + isDir, err = IsDir(it.fs, it.name) + if err != nil { + return nil, err + } + + it.infos = []*storage.ObjectAttrs{} + + if !isDir { + var info os.FileInfo + info, err = it.dir.Stat() + if err != nil { + return nil, err + } + it.infos = append(it.infos, &storage.ObjectAttrs{Name: normSeparators(info.Name()), Size: info.Size(), Updated: info.ModTime()}) + } else { + var fInfos []os.FileInfo + fInfos, err = it.dir.Readdir(0) + if err != nil { + return nil, err + } + if it.name != "" { + it.infos = append(it.infos, &storage.ObjectAttrs{ + Prefix: normSeparators(it.name) + "/", + }) + } + + for _, info := range fInfos { + it.infos = append(it.infos, &storage.ObjectAttrs{Name: normSeparators(info.Name()), Size: info.Size(), Updated: info.ModTime()}) + } + } + } + + if len(it.infos) == 0 { + return nil, iterator.Done + } + + res := it.infos[0] + it.infos = it.infos[1:] + + return res, err +} diff --git a/gcs_test.go b/gcs_test.go new file mode 100644 index 0000000..3b701e1 --- /dev/null +++ b/gcs_test.go @@ -0,0 +1,626 @@ +// Copyright © 2021 Vasily Ovchinnikov . +// +// Most of the tests are "derived" from the Afero's own tarfs implementation. +// Write-oriented tests and/or checks have been added on top of that + +package afero + +import ( + "context" + "errors" + "fmt" + "io" + "os" + "path/filepath" + "reflect" + "strings" + "syscall" + "testing" + + "github.com/spf13/afero/gcsfs" + + "cloud.google.com/go/storage" + "github.com/googleapis/google-cloud-go-testing/storage/stiface" +) + +const ( + testBytes = 8 + dirSize = 42 +) + +var files = []struct { + name string + exists bool + isdir bool + size int64 + content string + offset int64 + contentAtOffset string +}{ + {"", true, true, dirSize, "", 0, ""}, // this is NOT a valid path for GCS, so we do some magic here + {"sub", true, true, dirSize, "", 0, ""}, + {"sub/testDir2", true, true, dirSize, "", 0, ""}, + {"sub/testDir2/testFile", true, false, 8 * 1024, "c", 4 * 1024, "d"}, + {"testFile", true, false, 12 * 1024, "a", 7 * 1024, "b"}, + {"testDir1/testFile", true, false, 3 * 512, "b", 512, "c"}, + + {"nonExisting", false, false, dirSize, "", 0, ""}, +} + +var dirs = []struct { + name string + children []string +}{ + {"", []string{"sub", "testDir1", "testFile"}}, + {"sub", []string{"testDir2"}}, + {"sub/testDir2", []string{"testFile"}}, + {"testDir1", []string{"testFile"}}, +} + +var gcsAfs *Afero + +func TestMain(m *testing.M) { + ctx := context.Background() + var err error + + // Check if GOOGLE_APPLICATION_CREDENTIALS are present. If not, then a fake service account + // would be used: https://github.com/google/oauth2l/blob/master/integration/fixtures/fake-service-account.json + if os.Getenv("GOOGLE_APPLICATION_CREDENTIALS") == "" { + var fakeCredentialsAbsPath string + fakeCredentialsAbsPath, err = filepath.Abs("gcs-fake-service-account.json") + if err != nil { + fmt.Print(err) + os.Exit(1) + } + + err = os.Setenv("GOOGLE_APPLICATION_CREDENTIALS", fakeCredentialsAbsPath) + if err != nil { + fmt.Print(err) + os.Exit(1) + } + + // reset it after the run + defer func() { + err = os.Remove("GOOGLE_APPLICATION_CREDENTIALS") + if err != nil { + // it's worth printing it out explicitly, since it might have implications further down the road + fmt.Print("failed to clear fake GOOGLE_APPLICATION_CREDENTIALS", err) + } + }() + } + + var c *storage.Client + c, err = storage.NewClient(ctx) + if err != nil { + fmt.Print(err) + os.Exit(1) + } + client := stiface.AdaptClient(c) + + // This block is mocking the client for the sake of isolated testing + mockClient := newClientMock() + mockClient.Client = client + + bucket := mockClient.Bucket("a-test-bucket") + + // If you want to run the test suite on a LIVE bucket, comment the previous + // block and uncomment the line below and put your bucket name there. + // Keep in mind, that GCS will likely rate limit you, so it would be impossible + // to run the entire suite at once, only test by test. + //bucket := client.Bucket("a-test-bucket") + + gcsAfs = &Afero{Fs: &GcsFs{gcsfs.NewGcsFs(ctx, bucket)}} + + // defer here to assure our Env cleanup happens, if the mock was used + defer os.Exit(m.Run()) +} + +func createFiles(t *testing.T) { + t.Helper() + var err error + + // the files have to be created first + for _, f := range files { + if !f.isdir && f.exists { + var freshFile File + freshFile, err = gcsAfs.Create(f.name) + if err != nil { + t.Fatalf("failed to create a file \"%s\": %s", f.name, err) + } + + var written int + var totalWritten int64 + for totalWritten < f.size { + if totalWritten < f.offset { + writeBuf := []byte(strings.Repeat(f.content, int(f.offset))) + written, err = freshFile.WriteAt(writeBuf, totalWritten) + } else { + writeBuf := []byte(strings.Repeat(f.contentAtOffset, int(f.size-f.offset))) + written, err = freshFile.WriteAt(writeBuf, totalWritten) + } + if err != nil { + t.Fatalf("failed to write a file \"%s\": %s", f.name, err) + } + + totalWritten += int64(written) + } + + err = freshFile.Close() + if err != nil { + t.Fatalf("failed to close a file \"%s\": %s", f.name, err) + } + } + } +} + +func removeFiles(t *testing.T) { + t.Helper() + var err error + + // the files have to be created first + for _, f := range files { + if !f.isdir && f.exists { + err = gcsAfs.Remove(f.name) + if err != nil && err == syscall.ENOENT { + t.Errorf("failed to remove file \"%s\": %s", f.name, err) + } + } + } +} + +func TestFsOpen(t *testing.T) { + createFiles(t) + defer removeFiles(t) + + for _, f := range files { + file, err := gcsAfs.Open(f.name) + if (err == nil) != f.exists { + t.Errorf("%v exists = %v, but got err = %v", f.name, f.exists, err) + } + + if !f.exists { + continue + } + if err != nil { + t.Fatalf("%v: %v", f.name, err) + } + + if file.Name() != filepath.FromSlash(f.name) { + t.Errorf("Name(), got %v, expected %v", file.Name(), filepath.FromSlash(f.name)) + } + + s, err := file.Stat() + if err != nil { + t.Fatalf("stat %v: got error '%v'", file.Name(), err) + } + + if isdir := s.IsDir(); isdir != f.isdir { + t.Errorf("%v directory, got: %v, expected: %v", file.Name(), isdir, f.isdir) + } + + if size := s.Size(); size != f.size { + t.Errorf("%v size, got: %v, expected: %v", file.Name(), size, f.size) + } + } +} + +func TestRead(t *testing.T) { + createFiles(t) + defer removeFiles(t) + + for _, f := range files { + if !f.exists { + continue + } + + file, err := gcsAfs.Open(f.name) + if err != nil { + t.Fatalf("opening %v: %v", f.name, err) + } + + buf := make([]byte, 8) + n, err := file.Read(buf) + if err != nil { + if f.isdir && (err != syscall.EISDIR) { + t.Errorf("%v got error %v, expected EISDIR", f.name, err) + } else if !f.isdir { + t.Errorf("%v: %v", f.name, err) + } + } else if n != 8 { + t.Errorf("%v: got %d read bytes, expected 8", f.name, n) + } else if string(buf) != strings.Repeat(f.content, testBytes) { + t.Errorf("%v: got <%s>, expected <%s>", f.name, f.content, string(buf)) + } + + } +} + +func TestGcsReadAt(t *testing.T) { + createFiles(t) + defer removeFiles(t) + + for _, f := range files { + if !f.exists { + continue + } + + file, err := gcsAfs.Open(f.name) + if err != nil { + t.Fatalf("opening %v: %v", f.name, err) + } + + buf := make([]byte, testBytes) + n, err := file.ReadAt(buf, f.offset-testBytes/2) + if err != nil { + if f.isdir && (err != syscall.EISDIR) { + t.Errorf("%v got error %v, expected EISDIR", f.name, err) + } else if !f.isdir { + t.Errorf("%v: %v", f.name, err) + } + } else if n != 8 { + t.Errorf("%v: got %d read bytes, expected 8", f.name, n) + } else if string(buf) != strings.Repeat(f.content, testBytes/2)+strings.Repeat(f.contentAtOffset, testBytes/2) { + t.Errorf("%v: got <%s>, expected <%s>", f.name, f.contentAtOffset, string(buf)) + } + + } +} + +func TestGcsSeek(t *testing.T) { + createFiles(t) + defer removeFiles(t) + + for _, f := range files { + if !f.exists { + continue + } + + file, err := gcsAfs.Open(f.name) + if err != nil { + t.Fatalf("opening %v: %v", f.name, err) + } + + var tests = []struct { + offIn int64 + whence int + offOut int64 + }{ + {0, io.SeekStart, 0}, + {10, io.SeekStart, 10}, + {1, io.SeekCurrent, 11}, + {10, io.SeekCurrent, 21}, + {0, io.SeekEnd, f.size}, + {-1, io.SeekEnd, f.size - 1}, + } + + for _, s := range tests { + n, err := file.Seek(s.offIn, s.whence) + if err != nil { + if f.isdir && err == syscall.EISDIR { + continue + } + + t.Errorf("%v: %v", f.name, err) + } + + if n != s.offOut { + t.Errorf("%v: (off: %v, whence: %v): got %v, expected %v", f.name, s.offIn, s.whence, n, s.offOut) + } + } + + } +} + +func TestName(t *testing.T) { + createFiles(t) + defer removeFiles(t) + + for _, f := range files { + if !f.exists { + continue + } + + file, err := gcsAfs.Open(f.name) + if err != nil { + t.Fatalf("opening %v: %v", f.name, err) + } + + n := file.Name() + if n != filepath.FromSlash(f.name) { + t.Errorf("got: %v, expected: %v", n, filepath.FromSlash(f.name)) + } + + } +} + +func TestClose(t *testing.T) { + createFiles(t) + defer removeFiles(t) + + for _, f := range files { + if !f.exists { + continue + } + + file, err := gcsAfs.Open(f.name) + if err != nil { + t.Fatalf("opening %v: %v", f.name, err) + } + + err = file.Close() + if err != nil { + t.Errorf("%v: %v", f.name, err) + } + + err = file.Close() + if err == nil { + t.Errorf("%v: closing twice should return an error", f.name) + } + + buf := make([]byte, 8) + n, err := file.Read(buf) + if n != 0 || err == nil { + t.Errorf("%v: could read from a closed file", f.name) + } + + n, err = file.ReadAt(buf, 256) + if n != 0 || err == nil { + t.Errorf("%v: could readAt from a closed file", f.name) + } + + off, err := file.Seek(0, io.SeekStart) + if off != 0 || err == nil { + t.Errorf("%v: could seek from a closed file", f.name) + } + } +} + +func TestGcsOpenFile(t *testing.T) { + createFiles(t) + defer removeFiles(t) + + for _, f := range files { + file, err := gcsAfs.OpenFile(f.name, os.O_RDONLY, 0400) + if !f.exists { + if !errors.Is(err, syscall.ENOENT) { + t.Errorf("%v: got %v, expected%v", f.name, err, syscall.ENOENT) + } + + continue + } + + if err != nil { + t.Fatalf("%v: %v", f.name, err) + } + + err = file.Close() + if err != nil { + t.Fatalf("failed to close a file \"%s\": %s", f.name, err) + } + + file, err = gcsAfs.OpenFile(f.name, os.O_CREATE, 0600) + if !errors.Is(err, syscall.EPERM) { + t.Errorf("%v: open for write: got %v, expected %v", f.name, err, syscall.EPERM) + } + + } +} + +func TestFsStat(t *testing.T) { + createFiles(t) + defer removeFiles(t) + + for _, f := range files { + fi, err := gcsAfs.Stat(f.name) + if !f.exists { + if !errors.Is(err, syscall.ENOENT) { + t.Errorf("%v: got %v, expected%v", f.name, err, syscall.ENOENT) + } + + continue + } + + if err != nil { + t.Fatalf("stat %v: got error '%v'", f.name, err) + } + + if isdir := fi.IsDir(); isdir != f.isdir { + t.Errorf("%v directory, got: %v, expected: %v", f.name, isdir, f.isdir) + } + + if size := fi.Size(); size != f.size { + t.Errorf("%v size, got: %v, expected: %v", f.name, size, f.size) + } + } +} + +func TestGcsReaddir(t *testing.T) { + createFiles(t) + defer removeFiles(t) + + for _, d := range dirs { + dir, err := gcsAfs.Open(d.name) + if err != nil { + t.Fatal(err) + } + + fi, err := dir.Readdir(0) + if err != nil { + t.Fatal(err) + } + var names []string + for _, f := range fi { + names = append(names, f.Name()) + } + + if !reflect.DeepEqual(names, d.children) { + t.Errorf("%v: children, got '%v', expected '%v'", d.name, names, d.children) + } + + fi, err = dir.Readdir(1) + if err != nil { + t.Fatal(err) + } + + names = []string{} + for _, f := range fi { + names = append(names, f.Name()) + } + + if !reflect.DeepEqual(names, d.children[0:1]) { + t.Errorf("%v: children, got '%v', expected '%v'", d.name, names, d.children[0:1]) + } + } + + dir, err := gcsAfs.Open("testFile") + if err != nil { + t.Fatal(err) + } + + _, err = dir.Readdir(-1) + if err != syscall.ENOTDIR { + t.Fatal("Expected error") + } +} + +func TestGcsReaddirnames(t *testing.T) { + createFiles(t) + defer removeFiles(t) + + for _, d := range dirs { + dir, err := gcsAfs.Open(d.name) + if err != nil { + t.Fatal(err) + } + + names, err := dir.Readdirnames(0) + if err != nil { + t.Fatal(err) + } + + if !reflect.DeepEqual(names, d.children) { + t.Errorf("%v: children, got '%v', expected '%v'", d.name, names, d.children) + } + + names, err = dir.Readdirnames(1) + if err != nil { + t.Fatal(err) + } + + if !reflect.DeepEqual(names, d.children[0:1]) { + t.Errorf("%v: children, got '%v', expected '%v'", d.name, names, d.children[0:1]) + } + } + + dir, err := gcsAfs.Open("testFile") + if err != nil { + t.Fatal(err) + } + + _, err = dir.Readdir(-1) + if err != syscall.ENOTDIR { + t.Fatal("Expected error") + } +} + +func TestGcsGlob(t *testing.T) { + createFiles(t) + defer removeFiles(t) + + for _, s := range []struct { + glob string + entries []string + }{ + {filepath.FromSlash("/*"), []string{filepath.FromSlash("/sub"), filepath.FromSlash("/testDir1"), filepath.FromSlash("/testFile")}}, + {filepath.FromSlash("*"), []string{filepath.FromSlash("sub"), filepath.FromSlash("testDir1"), filepath.FromSlash("testFile")}}, + {filepath.FromSlash("/sub/*"), []string{filepath.FromSlash("/sub/testDir2")}}, + {filepath.FromSlash("/sub/testDir2/*"), []string{filepath.FromSlash("/sub/testDir2/testFile")}}, + {filepath.FromSlash("/testDir1/*"), []string{filepath.FromSlash("/testDir1/testFile")}}, + {filepath.FromSlash("sub/*"), []string{filepath.FromSlash("sub/testDir2")}}, + {filepath.FromSlash("sub/testDir2/*"), []string{filepath.FromSlash("sub/testDir2/testFile")}}, + {filepath.FromSlash("testDir1/*"), []string{filepath.FromSlash("testDir1/testFile")}}, + } { + entries, err := Glob(gcsAfs.Fs, s.glob) + if err != nil { + t.Error(err) + } + if reflect.DeepEqual(entries, s.entries) { + t.Logf("glob: %s: glob ok", s.glob) + } else { + t.Errorf("glob: %s: got %#v, expected %#v", s.glob, entries, s.entries) + } + } +} + +func TestMkdir(t *testing.T) { + dirName := "/a-test-dir" + var err error + + err = gcsAfs.Mkdir(dirName, 0755) + if err != nil { + t.Fatal("failed to create a folder with error", err) + } + + info, err := gcsAfs.Stat(dirName) + if err != nil { + t.Fatal("failed to get info", err) + } + if !info.IsDir() { + t.Fatalf("%s: not a dir", dirName) + } + if !info.Mode().IsDir() { + t.Errorf("%s: mode is not directory", dirName) + } + + if info.Mode() != os.ModeDir|0755 { + t.Errorf("%s: wrong permissions, expected drwxr-xr-x, got %s", dirName, info.Mode()) + } + + err = gcsAfs.Remove(dirName) + if err != nil { + t.Fatalf("could not delete the folder %s after the test with error: %s", dirName, err) + } +} + +func TestMkdirAll(t *testing.T) { + err := gcsAfs.MkdirAll("/a/b/c", 0755) + if err != nil { + t.Fatal(err) + } + + info, err := gcsAfs.Stat("/a") + if err != nil { + t.Fatal(err) + } + if !info.Mode().IsDir() { + t.Error("/a: mode is not directory") + } + if info.Mode() != os.ModeDir|0755 { + t.Errorf("/a: wrong permissions, expected drwxr-xr-x, got %s", info.Mode()) + } + info, err = gcsAfs.Stat("/a/b") + if err != nil { + t.Fatal(err) + } + if !info.Mode().IsDir() { + t.Error("/a/b: mode is not directory") + } + if info.Mode() != os.ModeDir|0755 { + t.Errorf("/a/b: wrong permissions, expected drwxr-xr-x, got %s", info.Mode()) + } + info, err = gcsAfs.Stat("/a/b/c") + if err != nil { + t.Fatal(err) + } + if !info.Mode().IsDir() { + t.Error("/a/b/c: mode is not directory") + } + if info.Mode() != os.ModeDir|0755 { + t.Errorf("/a/b/c: wrong permissions, expected drwxr-xr-x, got %s", info.Mode()) + } + + err = gcsAfs.RemoveAll("/a") + if err != nil { + t.Fatalf("failed to remove the folder /a with error: %s", err) + } +} diff --git a/gcsfs/errors.go b/gcsfs/errors.go new file mode 100644 index 0000000..7468ad5 --- /dev/null +++ b/gcsfs/errors.go @@ -0,0 +1,30 @@ +// Copyright © 2021 Vasily Ovchinnikov . +// +// The code in this file is derived from afero fork github.com/Zatte/afero by Mikael Rapp +// licensed under Apache License 2.0. +// +// 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 gcsfs + +import ( + "errors" + "syscall" +) + +var ( + ErrFileClosed = errors.New("file is closed") + ErrOutOfRange = errors.New("out of range") + ErrObjectDoesNotExist = errors.New("storage: object doesn't exist") + ErrEmptyObjectName = errors.New("storage: object name is empty") + ErrFileNotFound = syscall.ENOENT +) diff --git a/gcsfs/file.go b/gcsfs/file.go new file mode 100644 index 0000000..33364a4 --- /dev/null +++ b/gcsfs/file.go @@ -0,0 +1,305 @@ +// Copyright © 2021 Vasily Ovchinnikov . +// +// The code in this file is derived from afero fork github.com/Zatte/afero by Mikael Rapp +// licensed under Apache License 2.0. +// +// 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 gcsfs + +import ( + "context" + "fmt" + "io" + "log" + "os" + "path/filepath" + "sort" + "syscall" + + "github.com/googleapis/google-cloud-go-testing/storage/stiface" + + "cloud.google.com/go/storage" + + "google.golang.org/api/iterator" +) + +// GcsFs is the Afero version adapted for GCS +type GcsFile struct { + openFlags int + fhOffset int64 //File handle specific offset + closed bool + ReadDirIt stiface.ObjectIterator + resource *gcsFileResource +} + +func NewGcsFile( + ctx context.Context, + fs *GcsFs, + obj stiface.ObjectHandle, + openFlags int, + // Unused: there is no use to the file mode in GCloud just yet - but we keep it here, just in case we need it + fileMode os.FileMode, + name string, +) *GcsFile { + return &GcsFile{ + openFlags: openFlags, + fhOffset: 0, + closed: false, + ReadDirIt: nil, + resource: &gcsFileResource{ + ctx: ctx, + fs: fs, + + obj: obj, + name: name, + fileMode: fileMode, + + currentGcsSize: 0, + + offset: 0, + reader: nil, + writer: nil, + }, + } +} + +func NewGcsFileFromOldFH( + openFlags int, + fileMode os.FileMode, + oldFile *gcsFileResource, +) *GcsFile { + res := &GcsFile{ + openFlags: openFlags, + fhOffset: 0, + closed: false, + ReadDirIt: nil, + + resource: oldFile, + } + res.resource.fileMode = fileMode + + return res +} + +func (o *GcsFile) Close() error { + if o.closed { + // the afero spec expects the call to Close on a closed file to return an error + return ErrFileClosed + } + o.closed = true + return o.resource.Close() +} + +func (o *GcsFile) Seek(newOffset int64, whence int) (int64, error) { + if o.closed { + return 0, ErrFileClosed + } + + //Since this is an expensive operation; let's make sure we need it + if (whence == 0 && newOffset == o.fhOffset) || (whence == 1 && newOffset == 0) { + return o.fhOffset, nil + } + log.Printf("WARNING: Seek beavhior triggered, highly inefficent. Offset before seek is at %d\n", o.fhOffset) + + //Fore the reader/writers to be reopened (at correct offset) + err := o.Sync() + if err != nil { + return 0, err + } + stat, err := o.Stat() + if err != nil { + return 0, nil + } + + switch whence { + case 0: + o.fhOffset = newOffset + case 1: + o.fhOffset += newOffset + case 2: + o.fhOffset = stat.Size() + newOffset + } + return o.fhOffset, nil +} + +func (o *GcsFile) Read(p []byte) (n int, err error) { + return o.ReadAt(p, o.fhOffset) +} + +func (o *GcsFile) ReadAt(p []byte, off int64) (n int, err error) { + if o.closed { + return 0, ErrFileClosed + } + + read, err := o.resource.ReadAt(p, off) + o.fhOffset += int64(read) + return read, err +} + +func (o *GcsFile) Write(p []byte) (n int, err error) { + return o.WriteAt(p, o.fhOffset) +} + +func (o *GcsFile) WriteAt(b []byte, off int64) (n int, err error) { + if o.closed { + return 0, ErrFileClosed + } + + if o.openFlags&os.O_RDONLY != 0 { + return 0, fmt.Errorf("file is opend as read only") + } + + _, err = o.resource.obj.Attrs(o.resource.ctx) + if err != nil { + if err == storage.ErrObjectNotExist { + if o.openFlags&os.O_CREATE == 0 { + return 0, ErrFileNotFound + } + } else { + return 0, fmt.Errorf("error getting file attributes: %v", err) + } + } + + written, err := o.resource.WriteAt(b, off) + o.fhOffset += int64(written) + return written, err +} + +func (o *GcsFile) Name() string { + return filepath.FromSlash(o.resource.name) +} + +func (o *GcsFile) readdirImpl(count int) ([]*FileInfo, error) { + err := o.Sync() + if err != nil { + return nil, err + } + + var ownInfo os.FileInfo + ownInfo, err = o.Stat() + if err != nil { + return nil, err + } + + if !ownInfo.IsDir() { + return nil, syscall.ENOTDIR + } + + path := o.resource.fs.ensureTrailingSeparator(o.Name()) + if o.ReadDirIt == nil { + //log.Printf("Querying path : %s\n", path) + o.ReadDirIt = o.resource.fs.bucket.Objects( + o.resource.ctx, &storage.Query{Delimiter: o.resource.fs.separator, Prefix: path, Versions: false}) + } + var res []*FileInfo + for { + object, err := o.ReadDirIt.Next() + if err == iterator.Done { + // reset the iterator + o.ReadDirIt = nil + + if len(res) > 0 || count <= 0 { + return res, nil + } + + return res, io.EOF + } + if err != nil { + return res, err + } + + tmp := newFileInfoFromAttrs(object, o.resource.fileMode) + + if tmp.Name() == "" { + // neither object.Name, not object.Prefix were present - so let's skip this unknown thing + continue + } + + if object.Name == "" && object.Prefix == "" { + continue + } + + if tmp.Name() == ownInfo.Name() { + // Hmmm + continue + } + + res = append(res, tmp) + + // This would interrupt the iteration, once we reach the count. + // But it would then have files coming before folders - that's not what we want to have exactly, + // since it makes the results unpredictable. Hence, we iterate all the objects and then do + // the cut-off in a higher level method + //if count > 0 && len(res) >= count { + // break + //} + } + //return res, nil +} + +func (o *GcsFile) Readdir(count int) ([]os.FileInfo, error) { + fi, err := o.readdirImpl(count) + if len(fi) > 0 { + sort.Sort(ByName(fi)) + } + + if count > 0 { + fi = fi[:count] + } + + var res []os.FileInfo + for _, f := range fi { + res = append(res, f) + } + return res, err +} + +func (o *GcsFile) Readdirnames(n int) ([]string, error) { + fi, err := o.Readdir(n) + if err != nil && err != io.EOF { + return nil, err + } + names := make([]string, len(fi)) + + for i, f := range fi { + names[i] = f.Name() + } + return names, err +} + +func (o *GcsFile) Stat() (os.FileInfo, error) { + err := o.Sync() + if err != nil { + return nil, err + } + + return newFileInfo(o.Name(), o.resource.fs, o.resource.fileMode) +} + +func (o *GcsFile) Sync() error { + return o.resource.maybeCloseIo() +} + +func (o *GcsFile) Truncate(wantedSize int64) error { + if o.closed { + return ErrFileClosed + } + if o.openFlags == os.O_RDONLY { + return fmt.Errorf("file was opened as read only") + } + return o.resource.Truncate(wantedSize) +} + +func (o *GcsFile) WriteString(s string) (ret int, err error) { + return o.Write([]byte(s)) +} diff --git a/gcsfs/file_info.go b/gcsfs/file_info.go new file mode 100644 index 0000000..b14a5f6 --- /dev/null +++ b/gcsfs/file_info.go @@ -0,0 +1,137 @@ +// Copyright © 2021 Vasily Ovchinnikov . +// +// The code in this file is derived from afero fork github.com/Zatte/afero by Mikael Rapp +// licensed under Apache License 2.0. +// +// 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 gcsfs + +import ( + "os" + "path/filepath" + "strings" + "time" + + "cloud.google.com/go/storage" +) + +const ( + folderSize = 42 +) + +type FileInfo struct { + name string + size int64 + updated time.Time + isDir bool + fileMode os.FileMode +} + +func newFileInfo(name string, fs *GcsFs, fileMode os.FileMode) (*FileInfo, error) { + res := &FileInfo{ + name: name, + size: folderSize, + updated: time.Time{}, + isDir: false, + fileMode: fileMode, + } + + obj := fs.getObj(name) + + objAttrs, err := obj.Attrs(fs.ctx) + if err != nil { + if err.Error() == ErrEmptyObjectName.Error() { + // It's a root folder here, we return right away + res.name = fs.ensureTrailingSeparator(res.name) + res.isDir = true + return res, nil + } else if err.Error() == ErrObjectDoesNotExist.Error() { + // Folders do not actually "exist" in GCloud, so we have to check, if something exists with + // such a prefix + it := fs.bucket.Objects( + fs.ctx, &storage.Query{Delimiter: fs.separator, Prefix: name, Versions: false}) + if _, err = it.Next(); err == nil { + res.name = fs.ensureTrailingSeparator(res.name) + res.isDir = true + return res, nil + } + + return nil, ErrFileNotFound + } + return nil, err + } + + res.size = objAttrs.Size + res.updated = objAttrs.Updated + + return res, nil +} + +func newFileInfoFromAttrs(objAttrs *storage.ObjectAttrs, fileMode os.FileMode) *FileInfo { + res := &FileInfo{ + name: objAttrs.Name, + size: objAttrs.Size, + updated: objAttrs.Updated, + isDir: false, + fileMode: fileMode, + } + + if res.name == "" { + if objAttrs.Prefix != "" { + // It's a virtual folder! It does not have a name, but prefix - this is how GCS API + // deals with them at the moment + res.name = objAttrs.Prefix + res.size = folderSize + res.isDir = true + } + } + + return res +} + +func (fi *FileInfo) Name() string { + return filepath.Base(fi.name) +} + +func (fi *FileInfo) Size() int64 { + return fi.size +} +func (fi *FileInfo) Mode() os.FileMode { + if fi.IsDir() { + return os.ModeDir | fi.fileMode + } + return fi.fileMode +} + +func (fi *FileInfo) ModTime() time.Time { + return fi.updated +} + +func (fi *FileInfo) IsDir() bool { + return fi.isDir +} + +func (fi *FileInfo) Sys() interface{} { + return nil +} + +type ByName []*FileInfo + +func (a ByName) Len() int { return len(a) } +func (a ByName) Swap(i, j int) { + a[i].name, a[j].name = a[j].name, a[i].name + a[i].size, a[j].size = a[j].size, a[i].size + a[i].updated, a[j].updated = a[j].updated, a[i].updated + a[i].isDir, a[j].isDir = a[j].isDir, a[i].isDir +} +func (a ByName) Less(i, j int) bool { return strings.Compare(a[i].Name(), a[j].Name()) == -1 } diff --git a/gcsfs/file_resource.go b/gcsfs/file_resource.go new file mode 100644 index 0000000..b25d0e8 --- /dev/null +++ b/gcsfs/file_resource.go @@ -0,0 +1,271 @@ +// Copyright © 2021 Vasily Ovchinnikov . +// +// The code in this file is derived from afero fork github.com/Zatte/afero by Mikael Rapp +// licensed under Apache License 2.0. +// +// 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 gcsfs + +import ( + "bytes" + "context" + "fmt" + "io" + "os" + "syscall" + + "github.com/googleapis/google-cloud-go-testing/storage/stiface" +) + +const ( + maxWriteSize = 10000 +) + +// gcsFileResource represents a singleton version of each GCS object; +// Google cloud storage allows users to open multiple writers(!) to the same +// underlying resource, once the write is closed the written stream is commented. We are doing +// some magic where we read and and write to the same file which requires synchronization +// of the underlying resource. + +type gcsFileResource struct { + ctx context.Context + + fs *GcsFs + + obj stiface.ObjectHandle + name string + fileMode os.FileMode + + currentGcsSize int64 + offset int64 + reader io.ReadCloser + writer io.WriteCloser + + closed bool +} + +func (o *gcsFileResource) Close() error { + o.closed = true + // TODO rawGcsObjectsMap ? + return o.maybeCloseIo() +} + +func (o *gcsFileResource) maybeCloseIo() error { + if err := o.maybeCloseReader(); err != nil { + return fmt.Errorf("error closing reader: %v", err) + } + if err := o.maybeCloseWriter(); err != nil { + return fmt.Errorf("error closing writer: %v", err) + } + + return nil +} + +func (o *gcsFileResource) maybeCloseReader() error { + if o.reader == nil { + return nil + } + if err := o.reader.Close(); err != nil { + return err + } + o.reader = nil + return nil +} + +func (o *gcsFileResource) maybeCloseWriter() error { + if o.writer == nil { + return nil + } + + // In cases of partial writes (e.g. to the middle of a file stream), we need to + // append any remaining data from the original file before we close the reader (and + // commit the results.) + // For small writes it can be more efficient + // to keep the original reader but that is for another iteration + if o.currentGcsSize > o.offset { + currentFile, err := o.obj.NewRangeReader(o.ctx, o.offset, -1) + if err != nil { + return fmt.Errorf( + "couldn't simulate a partial write; the closing (and thus"+ + " the whole file write) is NOT commited to GCS. %v", err) + } + if currentFile != nil && currentFile.Remain() > 0 { + if _, err := io.Copy(o.writer, currentFile); err != nil { + return fmt.Errorf("error writing: %v", err) + } + } + } + + if err := o.writer.Close(); err != nil { + return err + } + o.writer = nil + return nil +} + +func (o *gcsFileResource) ReadAt(p []byte, off int64) (n int, err error) { + if cap(p) == 0 { + return 0, nil + } + + // Assume that if the reader is open; it is at the correct offset + // a good performance assumption that we must ensure holds + if off == o.offset && o.reader != nil { + n, err = o.reader.Read(p) + o.offset += int64(n) + return n, err + } + + // we have to check, whether it's a folder; the folder must not have an open readers, or writers though, + // so this check should not be invoked excessively and cause too much of a performance drop + if o.reader == nil && o.writer == nil { + var info *FileInfo + info, err = newFileInfo(o.name, o.fs, o.fileMode) + if err != nil { + return 0, err + } + + if info.IsDir() { + // trying to read a directory must return this + return 0, syscall.EISDIR + } + } + + // If any writers have written anything; commit it first so we can read it back. + if err = o.maybeCloseIo(); err != nil { + return 0, err + } + + //Then read at the correct offset. + r, err := o.obj.NewRangeReader(o.ctx, off, -1) + if err != nil { + return 0, err + } + o.reader = r + o.offset = off + + read, err := o.reader.Read(p) + o.offset += int64(read) + return read, err +} + +func (o *gcsFileResource) WriteAt(b []byte, off int64) (n int, err error) { + //If the writer is opened and at the correct offset we're good! + if off == o.offset && o.writer != nil { + n, err = o.writer.Write(b) + o.offset += int64(n) + return n, err + } + + // Ensure readers must be re-opened and that if a writer is active at another + // offset it is first committed before we do a "seek" below + if err = o.maybeCloseIo(); err != nil { + return 0, err + } + + w := o.obj.NewWriter(o.ctx) + // TRIGGER WARNING: This can seem like a hack but it works thanks + // to GCS strong consistency. We will open and write to the same file; First when the + // writer is closed will the content get committed to GCS. + // The general idea is this: + // Objectv1[:offset] -> Objectv2 + // newData1 -> Objectv2 + // Objectv1[offset+len(newData1):] -> Objectv2 + // Objectv2.Close + // + // It will however require a download and upload of the original file but it + // can't be avoided if we should support seek-write-operations on GCS. + objAttrs, err := o.obj.Attrs(o.ctx) + if err != nil { + if off > 0 { + return 0, err // WriteAt to a non existing file + } + + o.currentGcsSize = 0 + } else { + o.currentGcsSize = objAttrs.Size + } + + if off > o.currentGcsSize { + return 0, ErrOutOfRange + } + + if off > 0 { + var r stiface.Reader + r, err = o.obj.NewReader(o.ctx) + if err != nil { + return 0, err + } + if _, err = io.CopyN(w, r, off); err != nil { + return 0, err + } + if err = r.Close(); err != nil { + return 0, err + } + } + + o.writer = w + o.offset = off + + written, err := o.writer.Write(b) + + o.offset += int64(written) + return written, err +} + +func min(x, y int) int { + if x < y { + return x + } + return y +} + +func (o *gcsFileResource) Truncate(wantedSize int64) error { + if wantedSize < 0 { + return ErrOutOfRange + } + + if err := o.maybeCloseIo(); err != nil { + return err + } + + r, err := o.obj.NewRangeReader(o.ctx, 0, wantedSize) + if err != nil { + return err + } + + w := o.obj.NewWriter(o.ctx) + written, err := io.Copy(w, r) + if err != nil { + return err + } + + for written < wantedSize { + //Bulk up padding writes + paddingBytes := bytes.Repeat([]byte(" "), min(maxWriteSize, int(wantedSize-written))) + + n := 0 + if n, err = w.Write(paddingBytes); err != nil { + return err + } + + written += int64(n) + } + if err = r.Close(); err != nil { + return fmt.Errorf("error closing reader: %v", err) + } + if err = w.Close(); err != nil { + return fmt.Errorf("error closing writer: %v", err) + } + return nil +} diff --git a/gcsfs/fs.go b/gcsfs/fs.go new file mode 100644 index 0000000..79bfa3b --- /dev/null +++ b/gcsfs/fs.go @@ -0,0 +1,344 @@ +// Copyright © 2021 Vasily Ovchinnikov . +// +// The code in this file is derived from afero fork github.com/Zatte/afero by Mikael Rapp +// licensed under Apache License 2.0. +// +// 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 gcsfs + +import ( + "context" + "errors" + "log" + "os" + "path/filepath" + "strings" + "syscall" + "time" + + "github.com/googleapis/google-cloud-go-testing/storage/stiface" +) + +const ( + defaultFileMode = 0755 +) + +// GcsFs is a Fs implementation that uses functions provided by google cloud storage +type GcsFs struct { + ctx context.Context + bucket stiface.BucketHandle + separator string + rawGcsObjects map[string]*GcsFile + + autoRemoveEmptyFolders bool //trigger for creating "virtual folders" (not required by GCSs) +} + +func NewGcsFs(ctx context.Context, bucket stiface.BucketHandle) *GcsFs { + return NewGcsFsWithSeparator(ctx, bucket, "/") +} + +func NewGcsFsWithSeparator(ctx context.Context, bucket stiface.BucketHandle, folderSep string) *GcsFs { + return &GcsFs{ + ctx: ctx, + bucket: bucket, + separator: folderSep, + rawGcsObjects: make(map[string]*GcsFile), + + autoRemoveEmptyFolders: true, + } +} + +// normSeparators will normalize all "\\" and "/" to the provided separator +func (fs *GcsFs) normSeparators(s string) string { + return strings.Replace(strings.Replace(s, "\\", fs.separator, -1), "/", fs.separator, -1) +} + +func (fs *GcsFs) ensureTrailingSeparator(s string) string { + if len(s) > 0 && !strings.HasSuffix(s, fs.separator) { + return s + fs.separator + } + return s +} + +func (fs *GcsFs) ensureNoLeadingSeparators(s string) string { + // GCS does REALLY not like the names, that begin with a separator + if len(s) > 0 && strings.HasPrefix(s, fs.separator) { + log.Printf( + "WARNING: the provided path \"%s\" starts with a separator \"%s\", which is not supported by "+ + "GCloud. The separator will be automatically trimmed", + s, + fs.separator, + ) + return s[len(fs.separator):] + } + return s +} + +func correctTheDot(s string) string { + // So, Afero's Glob likes to give "." as a name - that to list the "empty" dir name. + // GCS _really_ dislikes the dot and gives no entries for it - so we should rather replace the dot + // with an empty string + if s == "." { + return "" + } + return s +} + +func (fs *GcsFs) getObj(name string) stiface.ObjectHandle { + return fs.bucket.Object(name) +} + +func (fs *GcsFs) Name() string { return "GcsFs" } + +func (fs *GcsFs) Create(name string) (*GcsFile, error) { + name = fs.ensureNoLeadingSeparators(fs.normSeparators(correctTheDot(name))) + + if !fs.autoRemoveEmptyFolders { + baseDir := filepath.Base(name) + if stat, err := fs.Stat(baseDir); err != nil || !stat.IsDir() { + err = fs.MkdirAll(baseDir, 0) + if err != nil { + return nil, err + } + } + } + + obj := fs.getObj(name) + w := obj.NewWriter(fs.ctx) + var err error + err = w.Close() + if err != nil { + return nil, err + } + file := NewGcsFile(fs.ctx, fs, obj, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0, name) + + fs.rawGcsObjects[name] = file + return file, nil +} + +func (fs *GcsFs) Mkdir(name string, _ os.FileMode) error { + name = fs.ensureTrailingSeparator(fs.ensureNoLeadingSeparators(fs.normSeparators(correctTheDot(name)))) + + obj := fs.getObj(name) + w := obj.NewWriter(fs.ctx) + return w.Close() +} + +func (fs *GcsFs) MkdirAll(path string, perm os.FileMode) error { + path = fs.ensureTrailingSeparator(fs.ensureNoLeadingSeparators(fs.normSeparators(correctTheDot(path)))) + + root := "" + folders := strings.Split(path, fs.separator) + for i, f := range folders { + if f == "" && i != 0 { + continue // it's the last item - it should be empty + } + //Don't force a delimiter prefix + if root != "" { + root = root + fs.separator + f + } else { + root = f + } + + if err := fs.Mkdir(root, perm); err != nil { + return err + } + } + return nil +} + +func (fs *GcsFs) Open(name string) (*GcsFile, error) { + return fs.OpenFile(name, os.O_RDONLY, 0) +} + +func (fs *GcsFs) OpenFile(name string, flag int, fileMode os.FileMode) (*GcsFile, error) { + var file *GcsFile + var err error + + name = fs.ensureNoLeadingSeparators(fs.normSeparators(correctTheDot(name))) + + obj, found := fs.rawGcsObjects[name] + if found { + file = NewGcsFileFromOldFH(flag, fileMode, obj.resource) + } else { + file = NewGcsFile(fs.ctx, fs, fs.getObj(name), flag, fileMode, name) + } + + if flag == os.O_RDONLY { + _, err = file.Stat() + if err != nil { + return nil, err + } + } + + if flag&os.O_TRUNC != 0 { + err = file.resource.obj.Delete(fs.ctx) + if err != nil { + return nil, err + } + return fs.Create(name) + } + + if flag&os.O_APPEND != 0 { + _, err = file.Seek(0, 2) + if err != nil { + return nil, err + } + } + + if flag&os.O_CREATE != 0 { + _, err = file.Stat() + if err == nil { // the file actually exists + return nil, syscall.EPERM + } + + _, err = file.WriteString("") + if err != nil { + return nil, err + } + } + return file, nil +} + +func (fs *GcsFs) Remove(name string) error { + name = fs.ensureNoLeadingSeparators(fs.normSeparators(correctTheDot(name))) + + obj := fs.getObj(name) + info, err := fs.Stat(name) + if err != nil { + return err + } + delete(fs.rawGcsObjects, name) + + if info.IsDir() { + // it's a folder, we ha to check its contents - it cannot be removed, if not empty + var dir *GcsFile + dir, err = fs.Open(name) + if err != nil { + return err + } + var infos []os.FileInfo + infos, err = dir.Readdir(0) + if len(infos) > 0 { + return syscall.ENOTEMPTY + } + + // it's an empty folder, we can continue + name = fs.ensureTrailingSeparator(name) + obj = fs.getObj(name) + + return obj.Delete(fs.ctx) + } + return obj.Delete(fs.ctx) +} + +func (fs *GcsFs) RemoveAll(path string) error { + path = fs.ensureNoLeadingSeparators(fs.normSeparators(correctTheDot(path))) + + pathInfo, err := fs.Stat(path) + if err != nil { + return err + } + if !pathInfo.IsDir() { + return fs.Remove(path) + } + + var dir *GcsFile + dir, err = fs.Open(path) + if err != nil { + return err + } + + var infos []os.FileInfo + infos, err = dir.Readdir(0) + for _, info := range infos { + err = fs.RemoveAll(path + fs.separator + info.Name()) + if err != nil { + return err + } + } + + return fs.Remove(path) + + //it := fs.bucket.Objects(fs.ctx, &storage.Query{Delimiter: fs.separator, Prefix: path, Versions: false}) + //for { + // objAttrs, err := it.Next() + // if err == iterator.Done { + // break + // } + // if err != nil { + // return err + // } + // + // name := objAttrs.Name + // if name == "" { + // name = objAttrs.Prefix + // } + // + // if name == path { + // // somehow happens + // continue + // } + // if objAttrs.Name == "" && objAttrs.Prefix != "" { + // // it's a folder, let's try to remove it normally first + // err = fs.Remove(path + fs.separator + objAttrs.Name) + // if err != nil { + // if err == syscall.ENOTEMPTY { + // err = fs.RemoveAll(path + fs.separator + objAttrs.Name) + // } + // } + // if err != nil { + // return err + // } + // + // } else { + // err = fs.Remove(objAttrs.Name) + // if err != nil { + // return err + // } + // } + //} + //return nil +} + +func (fs *GcsFs) Rename(oldName, newName string) error { + oldName = fs.ensureNoLeadingSeparators(fs.normSeparators(correctTheDot(oldName))) + newName = fs.ensureNoLeadingSeparators(fs.normSeparators(correctTheDot(newName))) + + src := fs.bucket.Object(oldName) + dst := fs.bucket.Object(newName) + + if _, err := dst.CopierFrom(src).Run(fs.ctx); err != nil { + return err + } + delete(fs.rawGcsObjects, oldName) + return src.Delete(fs.ctx) +} + +func (fs *GcsFs) Stat(name string) (os.FileInfo, error) { + name = fs.ensureNoLeadingSeparators(fs.normSeparators(correctTheDot(name))) + + return newFileInfo(name, fs, defaultFileMode) +} + +func (fs *GcsFs) Chmod(_ string, _ os.FileMode) error { + return errors.New("method Chmod is not implemented in GCS") +} + +func (fs *GcsFs) Chtimes(_ string, _, _ time.Time) error { + return errors.New("method Chtimes is not implemented. Create, Delete, Updated times are read only fields in GCS and set implicitly") +} + +func (fs *GcsFs) Chown(_ string, _, _ int) error { + return errors.New("method Chown is not implemented for GCS") +} diff --git a/go.mod b/go.mod index abe4fe1..8c17b67 100644 --- a/go.mod +++ b/go.mod @@ -1,9 +1,13 @@ module github.com/spf13/afero require ( + cloud.google.com/go/storage v1.14.0 + github.com/googleapis/google-cloud-go-testing v0.0.0-20200911160855-bcd43fbb19e8 github.com/pkg/sftp v1.10.1 - golang.org/x/crypto v0.0.0-20190820162420-60c769a6c586 - golang.org/x/text v0.3.3 + github.com/stretchr/testify v1.5.1 + golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9 + golang.org/x/text v0.3.4 + google.golang.org/api v0.40.0 ) go 1.13 diff --git a/go.sum b/go.sum index 89d9bfb..d7a8389 100644 --- a/go.sum +++ b/go.sum @@ -1,29 +1,459 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU= +cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU= +cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY= +cloud.google.com/go v0.44.3/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY= +cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc= +cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0= +cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To= +cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4= +cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M= +cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc= +cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKVk= +cloud.google.com/go 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