Initial QSfera import

Server/pkg/x/io/fsx/fallback.go

@@ -0,0 +1,37 @@
+package fsx
+
+import (
+	"github.com/spf13/afero"
+)
+
+var (
+	// assert interfaces implemented
+	_ afero.Fs = (*FallbackFS)(nil)
+	_ FS       = (*FallbackFS)(nil)
+)
+
+// FallbackFS is a filesystem that layers a primary filesystem on top of a secondary filesystem.
+type FallbackFS struct {
+	FS
+	primary   *BaseFS
+	secondary *BaseFS
+}
+
+// Primary returns the primary filesystem.
+func (d *FallbackFS) Primary() *BaseFS {
+	return d.primary
+}
+
+// Secondary returns the secondary filesystem.
+func (d *FallbackFS) Secondary() *BaseFS {
+	return d.secondary
+}
+
+// NewFallbackFS returns a new FallbackFS instance.
+func NewFallbackFS(primary, secondary FS) *FallbackFS {
+	return &FallbackFS{
+		FS:        FromAfero(afero.NewCopyOnWriteFs(secondary, primary)),
+		primary:   &BaseFS{Fs: primary},
+		secondary: &BaseFS{Fs: secondary},
+	}
+}

Server/pkg/x/io/fsx/fallback_test.go

@@ -0,0 +1,83 @@
+package fsx_test
+
+import (
+	"io"
+	"testing"
+
+	"github.com/onsi/gomega"
+	"github.com/spf13/afero"
+
+	"github.com/qsfera/server/pkg/x/io/fsx"
+)
+
+func TestLayeredFS(t *testing.T) {
+	g := gomega.NewWithT(t)
+
+	read := func(fs fsx.FS, name string) (string, error) {
+		f, err := fs.Open(name)
+		if err != nil {
+			return "", err
+		}
+
+		b, err := io.ReadAll(f)
+		if err != nil {
+			return "", err
+		}
+
+		return string(b), nil
+	}
+
+	mustRead := func(fs fsx.FS, name string) string {
+		s, err := read(fs, name)
+		g.Expect(err).ToNot(gomega.HaveOccurred())
+
+		return s
+	}
+
+	create := func(fs fsx.FS, name, content string) {
+		err := afero.WriteFile(fs, name, []byte(content), 0644)
+		g.Expect(err).ToNot(gomega.HaveOccurred())
+	}
+
+	primary := fsx.NewMemMapFs()
+	create(primary, "both.txt", "primary")
+	g.Expect(mustRead(primary, "both.txt")).To(gomega.Equal("primary"))
+	create(primary, "primary.txt", "primary")
+	g.Expect(mustRead(primary, "primary.txt")).To(gomega.Equal("primary"))
+
+	secondary := fsx.NewMemMapFs()
+	create(secondary, "both.txt", "secondary")
+	g.Expect(mustRead(secondary, "both.txt")).To(gomega.Equal("secondary"))
+	create(secondary, "secondary.txt", "secondary")
+	g.Expect(mustRead(secondary, "secondary.txt")).To(gomega.Equal("secondary"))
+
+	fs := fsx.NewFallbackFS(primary, fsx.NewReadOnlyFs(secondary))
+	g.Expect(mustRead(fs, "both.txt")).To(gomega.Equal("primary"))
+	g.Expect(mustRead(fs, "primary.txt")).To(gomega.Equal("primary"))
+	g.Expect(mustRead(fs, "secondary.txt")).To(gomega.Equal("secondary"))
+
+	create(fs, "fallback-fs.txt", "fallback-fs")
+	g.Expect(mustRead(fs, "fallback-fs.txt")).To(gomega.Equal("fallback-fs"))
+	g.Expect(mustRead(primary, "fallback-fs.txt")).To(gomega.Equal("fallback-fs"))
+	g.Expect(mustRead(fs.Primary(), "fallback-fs.txt")).To(gomega.Equal("fallback-fs"))
+	_, err := read(secondary, "fallback-fs.txt")
+	g.Expect(err).To(gomega.HaveOccurred())
+	_, err = read(fs.Secondary(), "fallback-fs.txt")
+	g.Expect(err).To(gomega.HaveOccurred())
+}
+
+func TestLayeredFS_Primary(t *testing.T) {
+	g := gomega.NewWithT(t)
+	primary := fsx.NewMemMapFs()
+	fs := fsx.NewFallbackFS(primary, fsx.NewMemMapFs())
+
+	g.Expect(primary).To(gomega.BeIdenticalTo(fs.Primary().Fs))
+}
+
+func TestLayeredFS_Secondary(t *testing.T) {
+	g := gomega.NewWithT(t)
+	secondary := fsx.NewMemMapFs()
+	fs := fsx.NewFallbackFS(fsx.NewMemMapFs(), secondary)
+
+	g.Expect(secondary).To(gomega.BeIdenticalTo(fs.Secondary().Fs))
+}

Server/pkg/x/io/fsx/fsx.go

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+package fsx
+
+import (
+	"io/fs"
+
+	"github.com/spf13/afero"
+)
+
+var (
+	// assert interfaces implemented
+	_ afero.Fs = (*BaseFS)(nil)
+	_ FS       = (*BaseFS)(nil)
+)
+
+// FS is our default interface for filesystems.
+type FS interface {
+	afero.Fs
+	IOFS() fs.FS
+}
+
+// BaseFS is our default implementation of the FS interface.
+type BaseFS struct {
+	afero.Fs
+}
+
+// IOFS returns the filesystem as an io/fs.FS.
+func (b *BaseFS) IOFS() fs.FS {
+	return afero.NewIOFS(b)
+}
+
+// FromAfero returns a new BaseFS instance from an afero.Fs.
+func FromAfero(fSys afero.Fs) *BaseFS {
+	return &BaseFS{Fs: fSys}
+}
+
+// FromIOFS returns a new BaseFS instance from an io/fs.FS.
+func FromIOFS(fSys fs.FS) *BaseFS {
+	return FromAfero(&afero.FromIOFS{FS: fSys})
+}
+
+// NewBasePathFs returns a new BaseFS which wraps the given filesystem with a base path.
+func NewBasePathFs(fSys FS, basePath string) *BaseFS {
+	return FromAfero(afero.NewBasePathFs(fSys, basePath))
+}
+
+// NewOsFs returns a new BaseFS which wraps the OS filesystem.
+func NewOsFs() *BaseFS {
+	return FromAfero(afero.NewOsFs())
+}
+
+// NewReadOnlyFs returns a new BaseFS which wraps the given filesystem with a read-only filesystem.
+func NewReadOnlyFs(FfSys FS) *BaseFS {
+	return FromAfero(afero.NewReadOnlyFs(FfSys))
+}
+
+// NewMemMapFs returns a new BaseFS which wraps the memory filesystem.
+func NewMemMapFs() *BaseFS {
+	return FromAfero(afero.NewMemMapFs())
+}

Server/pkg/x/io/fsx/fsx_test.go

@@ -0,0 +1,76 @@
+package fsx_test
+
+import (
+	"os"
+	"reflect"
+	"testing"
+
+	"github.com/onsi/gomega"
+
+	"github.com/qsfera/server/pkg/x/io/fsx"
+)
+
+func TestBase(t *testing.T) {
+	g := gomega.NewWithT(t)
+	wrapped := fsx.NewMemMapFs()
+	fs := fsx.BaseFS{Fs: wrapped.Fs}
+
+	g.Expect(wrapped.Fs).Should(gomega.BeIdenticalTo(fs.Fs))
+}
+
+func TestBase_IOFS(t *testing.T) {
+	g := gomega.NewWithT(t)
+	fs := fsx.BaseFS{Fs: fsx.NewMemMapFs()}
+	g.Expect(reflect.TypeOf(fs.IOFS()).Name()).Should(gomega.Equal("IOFS"))
+}
+
+func TestFromIOFS(t *testing.T) {
+	g := gomega.NewWithT(t)
+	fs := fsx.FromIOFS(os.DirFS("."))
+
+	g.Expect(reflect.TypeOf(fs.Fs).String()).Should(gomega.Equal("*afero.FromIOFS"))
+}
+
+func TestNewOsFs(t *testing.T) {
+	g := gomega.NewWithT(t)
+	fs := fsx.NewOsFs()
+
+	g.Expect(reflect.TypeOf(fs.Fs).String()).Should(gomega.Equal("*afero.OsFs"))
+}
+
+func TestNewBasePathFs(t *testing.T) {
+	g := gomega.NewWithT(t)
+	base := fsx.NewMemMapFs()
+
+	err := base.MkdirAll("first/foo/bar", 0755)
+	g.Expect(err).ToNot(gomega.HaveOccurred())
+
+	err = base.MkdirAll("second/foo/baz", 0755)
+	g.Expect(err).ToNot(gomega.HaveOccurred())
+
+	fs := fsx.NewBasePathFs(base, "first")
+
+	info, err := fs.Stat("/foo/bar")
+	g.Expect(err).ToNot(gomega.HaveOccurred())
+	g.Expect(info.IsDir()).To(gomega.BeTrue())
+
+	info, err = fs.Stat("/foo/baz")
+	g.Expect(err).To(gomega.HaveOccurred())
+	g.Expect(info).To(gomega.BeNil())
+
+	info, err = fs.Stat("../second/foo/baz")
+	g.Expect(err).To(gomega.HaveOccurred())
+	g.Expect(info).To(gomega.BeNil())
+}
+
+func TestNewReadOnlyFs(t *testing.T) {
+	g := gomega.NewWithT(t)
+	base := fsx.NewMemMapFs()
+
+	err := base.MkdirAll("first/foo/bar", 0755)
+	g.Expect(err).ToNot(gomega.HaveOccurred())
+
+	fs := fsx.NewReadOnlyFs(base)
+	err = fs.MkdirAll("first/foo/bay", 0755)
+	g.Expect(err).To(gomega.HaveOccurred())
+}