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file_test.go
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file_test.go
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package safeio
import (
"errors"
"os"
"path/filepath"
"testing"
"github.com/stretchr/testify/require"
)
func TestOpenFile_ok(t *testing.T) {
tmpDir, err := os.MkdirTemp("", "safeio")
require.NoError(t, err)
defer os.RemoveAll(tmpDir)
name := filepath.Join(tmpDir, "test1.txt")
mode := os.FileMode(0644)
f, err := OpenFile(name, mode)
require.NoError(t, err)
defer f.Close() // to prevent leaks
data := []byte("hello world\n")
n, err := f.Write(data)
require.NoError(t, err)
require.Equal(t, 12, n)
err = f.Commit()
require.NoError(t, err)
err = f.Close()
require.NoError(t, err)
// verify
read, err := os.ReadFile(name)
require.NoError(t, err)
require.Equal(t, data, read)
fi, err := os.Stat(name)
require.NoError(t, err)
require.Equal(t, mode, fi.Mode().Perm())
// this was the only file
list, err := os.ReadDir(tmpDir)
require.NoError(t, err)
require.Equal(t, 1, len(list))
}
func TestOpenFile_elective_abort(t *testing.T) {
tmpDir, err := os.MkdirTemp("", "safeio")
require.NoError(t, err)
defer os.RemoveAll(tmpDir)
name := filepath.Join(tmpDir, "test1.txt")
mode := os.FileMode(0644)
f, err := OpenFile(name, mode)
require.NoError(t, err)
defer f.Close() // to prevent leaks
data := []byte("hello world\n")
n, err := f.Write(data)
require.NoError(t, err)
require.Equal(t, 12, n)
// no commit
err = f.Close()
require.NoError(t, err)
// verify
_, err = os.ReadFile(name)
require.True(t, os.IsNotExist(err))
// no files
list, err := os.ReadDir(tmpDir)
require.NoError(t, err)
require.Equal(t, 0, len(list))
}
var testErrDiskBroke = errors.New("disk broke!")
func TestOpenFile_writeErrorOnCommit_abort(t *testing.T) {
tmpDir, err := os.MkdirTemp("", "safeio")
require.NoError(t, err)
defer os.RemoveAll(tmpDir)
name := filepath.Join(tmpDir, "test1.txt")
mode := os.FileMode(0644)
f, err := OpenFile(name, mode)
require.NoError(t, err)
defer f.Close() // to prevent leaks
data := []byte("hello world\n")
n, err := f.Write(data)
require.NoError(t, err)
require.Equal(t, 12, n)
// simulate disk wonkiness
f.setErr(testErrDiskBroke)
err = f.Commit()
require.Equal(t, testErrDiskBroke, err)
err = f.Close()
require.Equal(t, testErrDiskBroke, err)
// verify
_, err = os.ReadFile(name)
require.True(t, os.IsNotExist(err))
// no files
list, err := os.ReadDir(tmpDir)
require.NoError(t, err)
require.Equal(t, 0, len(list))
}
func TestOpenFile_writeErrorOnWrite_abort(t *testing.T) {
tmpDir, err := os.MkdirTemp("", "safeio")
require.NoError(t, err)
defer os.RemoveAll(tmpDir)
name := filepath.Join(tmpDir, "test1.txt")
mode := os.FileMode(0644)
f, err := OpenFile(name, mode)
require.NoError(t, err)
defer f.Close() // to prevent leaks
data := []byte("hello world\n")
// write half before the error
n, err := f.Write(data[0:6])
require.NoError(t, err)
require.Equal(t, 6, n)
// simulate disk wonkiness
f.setErr(testErrDiskBroke)
// and try to write half after the error
n, err = f.Write(data[6:])
require.Equal(t, testErrDiskBroke, err)
require.Equal(t, 0, n)
err = f.Commit()
require.Equal(t, testErrDiskBroke, err)
err = f.Close()
require.Equal(t, testErrDiskBroke, err)
// verify
_, err = os.ReadFile(name)
require.True(t, os.IsNotExist(err))
// no files
list, err := os.ReadDir(tmpDir)
require.NoError(t, err)
require.Equal(t, 0, len(list))
}