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// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package fastwalk_test
import (
"bytes"
"flag"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"reflect"
"runtime"
"sort"
"strings"
"sync"
"testing"
"golang.org/x/tools/internal/fastwalk"
)
func formatFileModes(m map[string]os.FileMode) string {
var keys []string
for k := range m {
keys = append(keys, k)
}
sort.Strings(keys)
var buf bytes.Buffer
for _, k := range keys {
fmt.Fprintf(&buf, "%-20s: %v\n", k, m[k])
}
return buf.String()
}
func testFastWalk(t *testing.T, files map[string]string, callback func(path string, typ os.FileMode) error, want map[string]os.FileMode) {
tempdir, err := ioutil.TempDir("", "test-fast-walk")
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(tempdir)
for path, contents := range files {
file := filepath.Join(tempdir, "/src", path)
if err := os.MkdirAll(filepath.Dir(file), 0755); err != nil {
t.Fatal(err)
}
var err error
if strings.HasPrefix(contents, "LINK:") {
err = os.Symlink(strings.TrimPrefix(contents, "LINK:"), file)
} else {
err = ioutil.WriteFile(file, []byte(contents), 0644)
}
if err != nil {
t.Fatal(err)
}
}
got := map[string]os.FileMode{}
var mu sync.Mutex
if err := fastwalk.Walk(tempdir, func(path string, typ os.FileMode) error {
mu.Lock()
defer mu.Unlock()
if !strings.HasPrefix(path, tempdir) {
t.Fatalf("bogus prefix on %q, expect %q", path, tempdir)
}
key := filepath.ToSlash(strings.TrimPrefix(path, tempdir))
if old, dup := got[key]; dup {
t.Fatalf("callback called twice for key %q: %v -> %v", key, old, typ)
}
got[key] = typ
return callback(path, typ)
}); err != nil {
t.Fatalf("callback returned: %v", err)
}
if !reflect.DeepEqual(got, want) {
t.Errorf("walk mismatch.\n got:\n%v\nwant:\n%v", formatFileModes(got), formatFileModes(want))
}
}
func TestFastWalk_Basic(t *testing.T) {
testFastWalk(t, map[string]string{
"foo/foo.go": "one",
"bar/bar.go": "two",
"skip/skip.go": "skip",
},
func(path string, typ os.FileMode) error {
return nil
},
map[string]os.FileMode{
"": os.ModeDir,
"/src": os.ModeDir,
"/src/bar": os.ModeDir,
"/src/bar/bar.go": 0,
"/src/foo": os.ModeDir,
"/src/foo/foo.go": 0,
"/src/skip": os.ModeDir,
"/src/skip/skip.go": 0,
})
}
func TestFastWalk_LongFileName(t *testing.T) {
longFileName := strings.Repeat("x", 255)
testFastWalk(t, map[string]string{
longFileName: "one",
},
func(path string, typ os.FileMode) error {
return nil
},
map[string]os.FileMode{
"": os.ModeDir,
"/src": os.ModeDir,
"/src/" + longFileName: 0,
},
)
}
func TestFastWalk_Symlink(t *testing.T) {
switch runtime.GOOS {
case "windows", "plan9":
t.Skipf("skipping on %s", runtime.GOOS)
}
testFastWalk(t, map[string]string{
"foo/foo.go": "one",
"bar/bar.go": "LINK:../foo.go",
"symdir": "LINK:foo",
},
func(path string, typ os.FileMode) error {
return nil
},
map[string]os.FileMode{
"": os.ModeDir,
"/src": os.ModeDir,
"/src/bar": os.ModeDir,
"/src/bar/bar.go": os.ModeSymlink,
"/src/foo": os.ModeDir,
"/src/foo/foo.go": 0,
"/src/symdir": os.ModeSymlink,
})
}
func TestFastWalk_SkipDir(t *testing.T) {
testFastWalk(t, map[string]string{
"foo/foo.go": "one",
"bar/bar.go": "two",
"skip/skip.go": "skip",
},
func(path string, typ os.FileMode) error {
if typ == os.ModeDir && strings.HasSuffix(path, "skip") {
return filepath.SkipDir
}
return nil
},
map[string]os.FileMode{
"": os.ModeDir,
"/src": os.ModeDir,
"/src/bar": os.ModeDir,
"/src/bar/bar.go": 0,
"/src/foo": os.ModeDir,
"/src/foo/foo.go": 0,
"/src/skip": os.ModeDir,
})
}
func TestFastWalk_SkipFiles(t *testing.T) {
// Directory iteration order is undefined, so there's no way to know
// which file to expect until the walk happens. Rather than mess
// with the test infrastructure, just mutate want.
var mu sync.Mutex
want := map[string]os.FileMode{
"": os.ModeDir,
"/src": os.ModeDir,
"/src/zzz": os.ModeDir,
"/src/zzz/c.go": 0,
}
testFastWalk(t, map[string]string{
"a_skipfiles.go": "a",
"b_skipfiles.go": "b",
"zzz/c.go": "c",
},
func(path string, typ os.FileMode) error {
if strings.HasSuffix(path, "_skipfiles.go") {
mu.Lock()
defer mu.Unlock()
want["/src/"+filepath.Base(path)] = 0
return fastwalk.SkipFiles
}
return nil
},
want)
if len(want) != 5 {
t.Errorf("saw too many files: wanted 5, got %v (%v)", len(want), want)
}
}
func TestFastWalk_TraverseSymlink(t *testing.T) {
switch runtime.GOOS {
case "windows", "plan9":
t.Skipf("skipping on %s", runtime.GOOS)
}
testFastWalk(t, map[string]string{
"foo/foo.go": "one",
"bar/bar.go": "two",
"skip/skip.go": "skip",
"symdir": "LINK:foo",
},
func(path string, typ os.FileMode) error {
if typ == os.ModeSymlink {
return fastwalk.TraverseLink
}
return nil
},
map[string]os.FileMode{
"": os.ModeDir,
"/src": os.ModeDir,
"/src/bar": os.ModeDir,
"/src/bar/bar.go": 0,
"/src/foo": os.ModeDir,
"/src/foo/foo.go": 0,
"/src/skip": os.ModeDir,
"/src/skip/skip.go": 0,
"/src/symdir": os.ModeSymlink,
"/src/symdir/foo.go": 0,
})
}
var benchDir = flag.String("benchdir", runtime.GOROOT(), "The directory to scan for BenchmarkFastWalk")
func BenchmarkFastWalk(b *testing.B) {
b.ReportAllocs()
for i := 0; i < b.N; i++ {
err := fastwalk.Walk(*benchDir, func(path string, typ os.FileMode) error { return nil })
if err != nil {
b.Fatal(err)
}
}
}
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