diff --git a/.mockery.yaml b/.mockery.yaml new file mode 100644 index 0000000..ed1e168 --- /dev/null +++ b/.mockery.yaml @@ -0,0 +1,4 @@ +quiet: False +all: True +inpackage: True +testonly: True diff --git a/errors.go b/errors.go index 92b87c7..8c78b6a 100644 --- a/errors.go +++ b/errors.go @@ -1,7 +1,15 @@ package pathlib -import "github.com/pkg/errors" +import "fmt" var ( - ErrDoesNotImplement = errors.Errorf("doesn't implement required interface") + // ErrDoesNotImplement indicates that the afero filesystem doesn't + // implement the required interface. + ErrDoesNotImplement = fmt.Errorf("doesn't implement required interface") + // ErrInfoIsNil indicates that a nil os.FileInfo object was provided + ErrInfoIsNil = fmt.Errorf("provided os.Info object was nil") + // ErrInvalidAlgorithm specifies that an unknown algorithm was given for Walk + ErrInvalidAlgorithm = fmt.Errorf("invalid algorithm specified") + // ErrStopWalk indicates to the Walk function that the walk should be aborted + ErrStopWalk = fmt.Errorf("stop filesystem walk") ) diff --git a/file.go b/file.go index 82e43e1..b951f31 100644 --- a/file.go +++ b/file.go @@ -1,6 +1,6 @@ package pathlib -import "github.com/spf13/afero" +import "github.com/LandonTClipp/afero" // File represents a file in the filesystem. It inherits the afero.File interface // but might also include additional functionality. diff --git a/go.mod b/go.mod index e4a353e..b2c4fcc 100644 --- a/go.mod +++ b/go.mod @@ -3,7 +3,9 @@ module github.com/chigopher/pathlib go 1.14 require ( + github.com/LandonTClipp/afero v1.3.6-0.20200907052150-97f9d166c7a3 github.com/pkg/errors v0.9.1 - github.com/spf13/afero v1.3.2 + github.com/rs/zerolog v1.18.0 github.com/stretchr/testify v1.6.1 + github.com/vektra/mockery/v2 v2.1.0 // indirect ) diff --git a/go.sum b/go.sum index 2f6a04e..3afa849 100644 --- a/go.sum +++ b/go.sum @@ -1,6 +1,143 @@ +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 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DO NOT EDIT. + +package pathlib + +import ( + os "os" + + mock "github.com/stretchr/testify/mock" +) + +// MockWalkFunc is an autogenerated mock type for the WalkFunc type +type MockWalkFunc struct { + mock.Mock +} + +// Execute provides a mock function with given fields: path, info, err +func (_m *MockWalkFunc) Execute(path *Path, info os.FileInfo, err error) error { + ret := _m.Called(path, info, err) + + var r0 error + if rf, ok := ret.Get(0).(func(*Path, os.FileInfo, error) error); ok { + r0 = rf(path, info, err) + } else { + r0 = ret.Error(0) + } + + return r0 +} diff --git a/mock_namer_test.go b/mock_namer_test.go new file mode 100644 index 0000000..d0890cd --- /dev/null +++ b/mock_namer_test.go @@ -0,0 +1,24 @@ +// Code generated by mockery v0.0.0-dev. DO NOT EDIT. + +package pathlib + +import mock "github.com/stretchr/testify/mock" + +// mockNamer is an autogenerated mock type for the namer type +type mockNamer struct { + mock.Mock +} + +// Name provides a mock function with given fields: +func (_m *mockNamer) Name() string { + ret := _m.Called() + + var r0 string + if rf, ok := ret.Get(0).(func() string); ok { + r0 = rf() + } else { + r0 = ret.Get(0).(string) + } + + return r0 +} diff --git a/path.go b/path.go index e4f8734..5ae5b18 100644 --- a/path.go +++ b/path.go @@ -8,7 +8,7 @@ import ( "time" "github.com/pkg/errors" - "github.com/spf13/afero" + "github.com/LandonTClipp/afero" ) // Path is an object that represents a path @@ -221,11 +221,6 @@ func (p *Path) SafeWriteReader(r io.Reader) error { return afero.SafeWriteReader(p.Fs(), p.Path(), r) } -// Walk walks path, using the given filepath.WalkFunc to handle each -func (p *Path) Walk(walkFn filepath.WalkFunc) error { - return afero.Walk(p.Fs(), p.Path(), walkFn) -} - // WriteFile writes the given data to the path (if possible). If the file exists, // the file is truncated. If the file is a directory, or the path doesn't exist, // an error is returned. diff --git a/path_test.go b/path_test.go index f929f4d..1d3a376 100644 --- a/path_test.go +++ b/path_test.go @@ -12,7 +12,7 @@ import ( "testing" "time" - "github.com/spf13/afero" + "github.com/LandonTClipp/afero" "github.com/stretchr/testify/assert" "github.com/stretchr/testify/require" "github.com/stretchr/testify/suite" diff --git a/walk.go b/walk.go new file mode 100644 index 0000000..c46a10b --- /dev/null +++ b/walk.go @@ -0,0 +1,217 @@ +package pathlib + +import ( + "errors" + "fmt" + "os" +) + +// WalkOpts is the struct that defines how a walk should be performed +type WalkOpts struct { + // Depth defines how far down a directory we should recurse. A value of -1 means + // infinite depth. 0 means only the direct children of root will be returned, etc. + Depth int + + // WalkAlgorithm specifies the algoritm that the Walk() function should use to + // traverse the directory. + WalkAlgorithm string + + // FollowSymlinks defines whether symlinks should be dereferenced or not. If True, + // the symlink itself will never be returned to WalkFunc, but rather whatever it + // points to. Warning!!! You are exposing yourself to substantial risk by setting this + // to True. Here be dragons! + FollowSymlinks bool + + // Size of the FIFO queue used when doing a breadth-first search + FIFOQueueSize int +} + +// DefaultWalkOpts returns the default WalkOpts struct used when +// walking a directory. +func DefaultWalkOpts() *WalkOpts { + return &WalkOpts{ + Depth: -1, + WalkAlgorithm: AlgorithmBasic(), + FollowSymlinks: false, + FIFOQueueSize: 100, + } +} + +func AlgorithmDepthFirst() string { + return "depth-first" +} + +func AlgorithmBasic() string { + return "basic" +} + +// Walk is an object that handles walking through a directory tree +type Walk struct { + Opts *WalkOpts + root *Path +} + +// NewWalk returns a new Walk struct with default values applied +func NewWalk(root *Path) (*Walk, error) { + return NewWalkWithOpts(root, DefaultWalkOpts()) +} + +// NewWalkWithOpts returns a Walk object with the given WalkOpts applied +func NewWalkWithOpts(root *Path, opts *WalkOpts) (*Walk, error) { + if root == nil { + return nil, fmt.Errorf("root path can't be nil") + } + if opts == nil { + return nil, fmt.Errorf("opts can't be nil") + } + return &Walk{ + Opts: opts, + root: root, + }, nil +} + +func (w *Walk) maxDepthReached(currentDepth int) bool { + if w.Opts.Depth >= 0 && currentDepth > w.Opts.Depth { + return true + } + return false +} + +type dfsObjectInfo struct { + path *Path + info os.FileInfo + err error +} + +func (w *Walk) walkDFS(walkFn WalkFunc, root *Path, currentDepth int) error { + if w.maxDepthReached(currentDepth) { + return nil + } + + var nonDirectories []*dfsObjectInfo + + if err := w.iterateImmediateChildren(root, func(child *Path, info os.FileInfo, encounteredErr error) error { + // Since we are doing depth-first, we have to first recurse through all the directories, + // and save all non-directory objects so we can defer handling at a later time. + if IsDir(info) { + if err := w.walkDFS(walkFn, child, currentDepth+1); err != nil { + return err + } + if err := walkFn(child, info, encounteredErr); err != nil { + return err + } + } else { + nonDirectories = append(nonDirectories, &dfsObjectInfo{ + path: child, + info: info, + err: encounteredErr, + }) + } + return nil + }); err != nil { + return err + } + + // Iterate over all non-directory objects + for _, nonDir := range nonDirectories { + if err := walkFn(nonDir.path, nonDir.info, nonDir.err); err != nil { + return err + } + } + return nil +} + +// iterateImmediateChildren is a function that handles discovering root's immediate children, +// and will run the algorithm function for every child. The algorithm function is essentially +// what differentiates how each walk behaves, and determines what actions to take given a +// certain child. +func (w *Walk) iterateImmediateChildren(root *Path, algorithmFunction WalkFunc) error { + children, err := root.ReadDir() + if err != nil { + return err + } + + var info os.FileInfo + for _, child := range children { + if child.Path() == root.Path() { + continue + } + if w.Opts.FollowSymlinks { + info, err = child.Stat() + isSymlink, err := IsSymlink(info) + if err != nil { + return err + } + if isSymlink { + child, err = child.ResolveAll() + if err != nil { + return err + } + } + + } else { + info, _, err = child.Lstat() + } + + if info == nil { + if err != nil { + return err + } + return ErrInfoIsNil + } + + if algoErr := algorithmFunction(child, info, err); algoErr != nil { + return algoErr + } + } + return nil +} + +func (w *Walk) walkBasic(walkFn WalkFunc, root *Path, currentDepth int) error { + if w.maxDepthReached(currentDepth) { + return nil + } + + err := w.iterateImmediateChildren(root, func(child *Path, info os.FileInfo, encounteredErr error) error { + if IsDir(info) { + if err := w.walkBasic(walkFn, child, currentDepth+1); err != nil { + return err + } + } + + if err := walkFn(child, info, encounteredErr); err != nil { + return err + } + return nil + }) + + return err +} + +// WalkFunc is the function provided to the Walk function for each directory. +type WalkFunc func(path *Path, info os.FileInfo, err error) error + +// Walk walks the directory using the algorithm specified in the configuration. +func (w *Walk) Walk(walkFn WalkFunc) error { + + switch w.Opts.WalkAlgorithm { + case AlgorithmBasic(): + if err := w.walkBasic(walkFn, w.root, 0); err != nil { + if errors.Is(err, ErrStopWalk) { + return nil + } + return err + } + return nil + case AlgorithmDepthFirst(): + if err := w.walkDFS(walkFn, w.root, 0); err != nil { + if errors.Is(err, ErrStopWalk) { + return nil + } + return err + } + return nil + default: + return ErrInvalidAlgorithm + } +} diff --git a/walk_test.go b/walk_test.go new file mode 100644 index 0000000..330ff98 --- /dev/null +++ b/walk_test.go @@ -0,0 +1,206 @@ +package pathlib + +import ( + "fmt" + "reflect" + "testing" + + "github.com/LandonTClipp/afero" + "github.com/stretchr/testify/mock" + "github.com/stretchr/testify/require" + "github.com/stretchr/testify/suite" +) + +// *********************** +// * FILESYSTEM FIXTURES * +// *********************** +// The following functions provide different "scenarios" +// that you might encounter in a filesystem tree. + +func HelloWorld(root *Path) error { + hello := root.Join("hello.txt") + return hello.WriteFile([]byte("hello world"), 0o644) +} + +func OneFile(root *Path, name string, content string) error { + file := root.Join(name) + return file.WriteFile([]byte(content), 0o644) +} + +func NFiles(root *Path, n int) error { + for i := 0; i < n; i++ { + if err := OneFile(root, fmt.Sprintf("file%d.txt", i), fmt.Sprintf("file%d contents", i)); err != nil { + return err + } + } + return nil +} + +// TwoFilesAtRootTwoInSubdir creates two files in the root dir, +// a directory, and creates two files inside that new directory. +func TwoFilesAtRootTwoInSubdir(root *Path) error { + if err := NFiles(root, 2); err != nil { + return err + } + subdir := root.Join("subdir") + if err := subdir.Mkdir(0o777); err != nil { + return err + } + return NFiles(subdir, 2) +} + +// ********* +// * TESTS * +// ********* + +// WalkSuiteAll is a set of tests that should be run +// for all walk algorithms. It asserts the behaviors that +// are identical between all algorithms. +type WalkSuiteAll struct { + suite.Suite + walk *Walk + root *Path + algorithm string + Fs afero.Fs +} + +func (w *WalkSuiteAll) SetupTest() { + var err error + + w.Fs = afero.NewMemMapFs() + w.root = NewPathAfero("/", w.Fs) + w.walk, err = NewWalk(w.root) + require.NoError(w.T(), err) + w.walk.Opts.WalkAlgorithm = w.algorithm +} + +func (w *WalkSuiteAll) TeardownTest() { + +} + +func (w *WalkSuiteAll) TestHello() { + require.NoError(w.T(), HelloWorld(w.root)) + + walkFunc := MockWalkFunc{} + walkFunc.On("Execute", mock.Anything, mock.Anything, nil).Return(nil) + w.NoError(w.walk.Walk(walkFunc.Execute)) + walkFunc.AssertExpectations(w.T()) +} + +func (w *WalkSuiteAll) TestTwoFiles() { + require.NoError(w.T(), NFiles(w.root, 2)) + + walkFunc := MockWalkFunc{} + walkFunc.On("Execute", mock.Anything, mock.Anything, nil).Return(nil) + w.NoError(w.walk.Walk(walkFunc.Execute)) + walkFunc.AssertExpectations(w.T()) + walkFunc.AssertNumberOfCalls(w.T(), "Execute", 2) +} + +func (w *WalkSuiteAll) TestTwoFilesNested() { + require.NoError(w.T(), TwoFilesAtRootTwoInSubdir(w.root)) + + walkFunc := MockWalkFunc{} + walkFunc.On("Execute", mock.Anything, mock.Anything, nil).Return(nil) + w.NoError(w.walk.Walk(walkFunc.Execute)) + walkFunc.AssertExpectations(w.T()) + walkFunc.AssertNumberOfCalls(w.T(), "Execute", 5) +} + +func (w *WalkSuiteAll) TestZeroDepth() { + w.walk.Opts.Depth = 0 + w.walk.Opts.FollowSymlinks = true + require.NoError(w.T(), TwoFilesAtRootTwoInSubdir(w.root)) + + walkFunc := MockWalkFunc{} + walkFunc.On("Execute", mock.Anything, mock.Anything, nil).Return(nil) + w.NoError(w.walk.Walk(walkFunc.Execute)) + walkFunc.AssertExpectations(w.T()) + + // WalkFunc should be called three times because there are two files and + // one subdir. + walkFunc.AssertNumberOfCalls(w.T(), "Execute", 3) +} + +func (w *WalkSuiteAll) TestStopWalk() { + require.NoError(w.T(), TwoFilesAtRootTwoInSubdir(w.root)) + + walkFunc := MockWalkFunc{} + walkFunc.On("Execute", mock.Anything, mock.Anything, nil).Return(ErrStopWalk) + w.NoError(w.walk.Walk(walkFunc.Execute)) + walkFunc.AssertExpectations(w.T()) + walkFunc.AssertNumberOfCalls(w.T(), "Execute", 1) +} + +func (w *WalkSuiteAll) TestWalkFuncErr() { + require.NoError(w.T(), TwoFilesAtRootTwoInSubdir(w.root)) + + wantErr := fmt.Errorf("Aww shoot") + walkFunc := MockWalkFunc{} + walkFunc.On("Execute", mock.Anything, mock.Anything, nil).Return(wantErr) + w.EqualError(w.walk.Walk(walkFunc.Execute), wantErr.Error(), "did not receive the expected err") + walkFunc.AssertExpectations(w.T()) + walkFunc.AssertNumberOfCalls(w.T(), "Execute", 1) +} + +func TestWalkSuite(t *testing.T) { + for _, algorithm := range []string{ + AlgorithmBasic(), + AlgorithmDepthFirst(), + } { + walkSuite := new(WalkSuiteAll) + walkSuite.algorithm = algorithm + suite.Run(t, walkSuite) + } +} + +func TestDefaultWalkOpts(t *testing.T) { + tests := []struct { + name string + want *WalkOpts + }{ + {"assert defaults", &WalkOpts{-1, AlgorithmBasic(), false, 100}}, + } + for _, tt := range tests { + t.Run(tt.name, func(t *testing.T) { + if got := DefaultWalkOpts(); !reflect.DeepEqual(got, tt.want) { + t.Errorf("DefaultWalkOpts() = %v, want %v", got, tt.want) + } + }) + } +} + +func TestWalk_Walk(t *testing.T) { + type fields struct { + Opts *WalkOpts + root *Path + } + type args struct { + walkFn WalkFunc + } + tests := []struct { + name string + fields fields + args args + wantErr bool + }{ + { + name: "Bad algoritm", + fields: fields{ + Opts: &WalkOpts{WalkAlgorithm: "confused wandering"}, + }, + wantErr: true, + }, + } + for _, tt := range tests { + t.Run(tt.name, func(t *testing.T) { + w := &Walk{ + Opts: tt.fields.Opts, + root: tt.fields.root, + } + if err := w.Walk(tt.args.walkFn); (err != nil) != tt.wantErr { + t.Errorf("Walk.Walk() error = %v, wantErr %v", err, tt.wantErr) + } + }) + } +}