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// Copyright 2022 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package dbfs
import (
"bufio"
"io"
"os"
"testing"
"code.gitea.io/gitea/models/db"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
func changeDefaultFileBlockSize(n int64) (restore func()) {
old := defaultFileBlockSize
defaultFileBlockSize = n
return func() {
defaultFileBlockSize = old
}
}
func TestDbfsBasic(t *testing.T) {
defer changeDefaultFileBlockSize(4)()
// test basic write/read
f, err := OpenFile(db.DefaultContext, "test.txt", os.O_RDWR|os.O_CREATE)
require.NoError(t, err)
n, err := f.Write([]byte("0123456789")) // blocks: 0123 4567 89
require.NoError(t, err)
assert.EqualValues(t, 10, n)
_, err = f.Seek(0, io.SeekStart)
require.NoError(t, err)
buf, err := io.ReadAll(f)
require.NoError(t, err)
assert.EqualValues(t, 10, n)
assert.EqualValues(t, "0123456789", string(buf))
// write some new data
_, err = f.Seek(1, io.SeekStart)
require.NoError(t, err)
_, err = f.Write([]byte("bcdefghi")) // blocks: 0bcd efgh i9
require.NoError(t, err)
// read from offset
buf, err = io.ReadAll(f)
require.NoError(t, err)
assert.EqualValues(t, "9", string(buf))
// read all
_, err = f.Seek(0, io.SeekStart)
require.NoError(t, err)
buf, err = io.ReadAll(f)
require.NoError(t, err)
assert.EqualValues(t, "0bcdefghi9", string(buf))
// write to new size
_, err = f.Seek(-1, io.SeekEnd)
require.NoError(t, err)
_, err = f.Write([]byte("JKLMNOP")) // blocks: 0bcd efgh iJKL MNOP
require.NoError(t, err)
_, err = f.Seek(0, io.SeekStart)
require.NoError(t, err)
buf, err = io.ReadAll(f)
require.NoError(t, err)
assert.EqualValues(t, "0bcdefghiJKLMNOP", string(buf))
// write beyond EOF and fill with zero
_, err = f.Seek(5, io.SeekCurrent)
require.NoError(t, err)
_, err = f.Write([]byte("xyzu")) // blocks: 0bcd efgh iJKL MNOP 0000 0xyz u
require.NoError(t, err)
_, err = f.Seek(0, io.SeekStart)
require.NoError(t, err)
buf, err = io.ReadAll(f)
require.NoError(t, err)
assert.EqualValues(t, "0bcdefghiJKLMNOP\x00\x00\x00\x00\x00xyzu", string(buf))
// write to the block with zeros
_, err = f.Seek(-6, io.SeekCurrent)
require.NoError(t, err)
_, err = f.Write([]byte("ABCD")) // blocks: 0bcd efgh iJKL MNOP 000A BCDz u
require.NoError(t, err)
_, err = f.Seek(0, io.SeekStart)
require.NoError(t, err)
buf, err = io.ReadAll(f)
require.NoError(t, err)
assert.EqualValues(t, "0bcdefghiJKLMNOP\x00\x00\x00ABCDzu", string(buf))
require.NoError(t, f.Close())
// test rename
err = Rename(db.DefaultContext, "test.txt", "test2.txt")
require.NoError(t, err)
_, err = OpenFile(db.DefaultContext, "test.txt", os.O_RDONLY)
require.Error(t, err)
f, err = OpenFile(db.DefaultContext, "test2.txt", os.O_RDONLY)
require.NoError(t, err)
require.NoError(t, f.Close())
// test remove
err = Remove(db.DefaultContext, "test2.txt")
require.NoError(t, err)
_, err = OpenFile(db.DefaultContext, "test2.txt", os.O_RDONLY)
require.Error(t, err)
// test stat
f, err = OpenFile(db.DefaultContext, "test/test.txt", os.O_RDWR|os.O_CREATE)
require.NoError(t, err)
stat, err := f.Stat()
require.NoError(t, err)
assert.EqualValues(t, "test.txt", stat.Name())
assert.EqualValues(t, 0, stat.Size())
_, err = f.Write([]byte("0123456789"))
require.NoError(t, err)
stat, err = f.Stat()
require.NoError(t, err)
assert.EqualValues(t, 10, stat.Size())
}
func TestDbfsReadWrite(t *testing.T) {
defer changeDefaultFileBlockSize(4)()
f1, err := OpenFile(db.DefaultContext, "test.log", os.O_RDWR|os.O_CREATE)
require.NoError(t, err)
defer f1.Close()
f2, err := OpenFile(db.DefaultContext, "test.log", os.O_RDONLY)
require.NoError(t, err)
defer f2.Close()
_, err = f1.Write([]byte("line 1\n"))
require.NoError(t, err)
f2r := bufio.NewReader(f2)
line, err := f2r.ReadString('\n')
require.NoError(t, err)
assert.EqualValues(t, "line 1\n", line)
_, err = f2r.ReadString('\n')
require.ErrorIs(t, err, io.EOF)
_, err = f1.Write([]byte("line 2\n"))
require.NoError(t, err)
line, err = f2r.ReadString('\n')
require.NoError(t, err)
assert.EqualValues(t, "line 2\n", line)
_, err = f2r.ReadString('\n')
require.ErrorIs(t, err, io.EOF)
}
func TestDbfsSeekWrite(t *testing.T) {
defer changeDefaultFileBlockSize(4)()
f, err := OpenFile(db.DefaultContext, "test2.log", os.O_RDWR|os.O_CREATE)
require.NoError(t, err)
defer f.Close()
n, err := f.Write([]byte("111"))
require.NoError(t, err)
_, err = f.Seek(int64(n), io.SeekStart)
require.NoError(t, err)
_, err = f.Write([]byte("222"))
require.NoError(t, err)
_, err = f.Seek(int64(n), io.SeekStart)
require.NoError(t, err)
_, err = f.Write([]byte("333"))
require.NoError(t, err)
fr, err := OpenFile(db.DefaultContext, "test2.log", os.O_RDONLY)
require.NoError(t, err)
defer f.Close()
buf, err := io.ReadAll(fr)
require.NoError(t, err)
assert.EqualValues(t, "111333", string(buf))
}
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