初始提交: Gitea 项目代码
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// Copyright 2022 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package dbfs
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import (
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"bufio"
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"io"
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"os"
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"testing"
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"gitea.dev/modules/test"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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)
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func TestDbfsBasic(t *testing.T) {
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defer test.MockVariableValue(&defaultFileBlockSize, 4)()
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// test basic write/read
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f, err := OpenFile(t.Context(), "test.txt", os.O_RDWR|os.O_CREATE)
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assert.NoError(t, err)
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n, err := f.Write([]byte("0123456789")) // blocks: 0123 4567 89
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assert.NoError(t, err)
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assert.Equal(t, 10, n)
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_, err = f.Seek(0, io.SeekStart)
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assert.NoError(t, err)
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buf, err := io.ReadAll(f)
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assert.NoError(t, err)
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assert.Equal(t, 10, n)
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assert.Equal(t, "0123456789", string(buf))
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// write some new data
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_, err = f.Seek(1, io.SeekStart)
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assert.NoError(t, err)
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_, err = f.Write([]byte("bcdefghi")) // blocks: 0bcd efgh i9
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assert.NoError(t, err)
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// read from offset
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buf, err = io.ReadAll(f)
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assert.NoError(t, err)
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assert.Equal(t, "9", string(buf))
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// read all
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_, err = f.Seek(0, io.SeekStart)
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assert.NoError(t, err)
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buf, err = io.ReadAll(f)
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assert.NoError(t, err)
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assert.Equal(t, "0bcdefghi9", string(buf))
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// write to new size
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_, err = f.Seek(-1, io.SeekEnd)
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assert.NoError(t, err)
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_, err = f.Write([]byte("JKLMNOP")) // blocks: 0bcd efgh iJKL MNOP
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assert.NoError(t, err)
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_, err = f.Seek(0, io.SeekStart)
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assert.NoError(t, err)
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buf, err = io.ReadAll(f)
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assert.NoError(t, err)
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assert.Equal(t, "0bcdefghiJKLMNOP", string(buf))
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// write beyond EOF and fill with zero
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_, err = f.Seek(5, io.SeekCurrent)
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assert.NoError(t, err)
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_, err = f.Write([]byte("xyzu")) // blocks: 0bcd efgh iJKL MNOP 0000 0xyz u
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assert.NoError(t, err)
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_, err = f.Seek(0, io.SeekStart)
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assert.NoError(t, err)
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buf, err = io.ReadAll(f)
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assert.NoError(t, err)
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assert.Equal(t, "0bcdefghiJKLMNOP\x00\x00\x00\x00\x00xyzu", string(buf))
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// write to the block with zeros
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_, err = f.Seek(-6, io.SeekCurrent)
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assert.NoError(t, err)
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_, err = f.Write([]byte("ABCD")) // blocks: 0bcd efgh iJKL MNOP 000A BCDz u
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assert.NoError(t, err)
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_, err = f.Seek(0, io.SeekStart)
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assert.NoError(t, err)
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buf, err = io.ReadAll(f)
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assert.NoError(t, err)
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assert.Equal(t, "0bcdefghiJKLMNOP\x00\x00\x00ABCDzu", string(buf))
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assert.NoError(t, f.Close())
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// test rename
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err = Rename(t.Context(), "test.txt", "test2.txt")
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assert.NoError(t, err)
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_, err = OpenFile(t.Context(), "test.txt", os.O_RDONLY)
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assert.Error(t, err)
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f, err = OpenFile(t.Context(), "test2.txt", os.O_RDONLY)
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assert.NoError(t, err)
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assert.NoError(t, f.Close())
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// test remove
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err = Remove(t.Context(), "test2.txt")
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assert.NoError(t, err)
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_, err = OpenFile(t.Context(), "test2.txt", os.O_RDONLY)
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assert.Error(t, err)
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// test stat
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f, err = OpenFile(t.Context(), "test/test.txt", os.O_RDWR|os.O_CREATE)
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assert.NoError(t, err)
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stat, err := f.Stat()
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assert.NoError(t, err)
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assert.Equal(t, "test.txt", stat.Name())
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assert.EqualValues(t, 0, stat.Size())
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_, err = f.Write([]byte("0123456789"))
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assert.NoError(t, err)
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stat, err = f.Stat()
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assert.NoError(t, err)
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assert.EqualValues(t, 10, stat.Size())
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t.Run("NonExisting", func(t *testing.T) {
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f, err := OpenFile(t.Context(), "non-existing.txt", os.O_RDONLY)
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assert.ErrorIs(t, err, os.ErrNotExist)
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assert.Nil(t, f)
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f, err = OpenFile(t.Context(), "non-existing.txt", os.O_WRONLY)
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assert.ErrorIs(t, err, os.ErrNotExist)
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assert.Nil(t, f)
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f, err = OpenFile(t.Context(), "non-existing.txt", os.O_WRONLY|os.O_APPEND|os.O_TRUNC)
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assert.ErrorIs(t, err, os.ErrNotExist)
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assert.Nil(t, f)
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})
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t.Run("Existing", func(t *testing.T) {
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assertFileContent := func(f File, expected string) {
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_, err := f.Seek(0, io.SeekStart)
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require.NoError(t, err)
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buf, err := io.ReadAll(f)
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require.NoError(t, err)
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assert.Equal(t, expected, string(buf))
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}
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f, err := OpenFile(t.Context(), "existing.txt", os.O_RDWR|os.O_CREATE)
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require.NoError(t, err)
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_, _ = f.Write([]byte("test"))
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assertFileContent(f, "test")
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assert.NoError(t, f.Close())
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f, err = OpenFile(t.Context(), "existing.txt", os.O_RDWR|os.O_CREATE|os.O_APPEND)
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require.NoError(t, err)
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_, _ = f.Write([]byte("\nnew"))
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assertFileContent(f, "test\nnew")
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assert.NoError(t, f.Close())
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f, err = OpenFile(t.Context(), "existing.txt", os.O_RDWR|os.O_TRUNC)
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require.NoError(t, err)
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assertFileContent(f, "")
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assert.NoError(t, f.Close())
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f, err = OpenFile(t.Context(), "existing.txt", os.O_RDWR|os.O_CREATE|os.O_EXCL)
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assert.ErrorIs(t, err, os.ErrExist)
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assert.Nil(t, f)
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})
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}
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func TestDbfsReadWrite(t *testing.T) {
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defer test.MockVariableValue(&defaultFileBlockSize, 4)()
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f1, err := OpenFile(t.Context(), "test.log", os.O_RDWR|os.O_CREATE)
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assert.NoError(t, err)
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defer f1.Close()
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f2, err := OpenFile(t.Context(), "test.log", os.O_RDONLY)
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assert.NoError(t, err)
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defer f2.Close()
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_, err = f1.Write([]byte("line 1\n"))
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assert.NoError(t, err)
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f2r := bufio.NewReader(f2)
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line, err := f2r.ReadString('\n')
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assert.NoError(t, err)
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assert.Equal(t, "line 1\n", line)
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_, err = f2r.ReadString('\n')
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assert.ErrorIs(t, err, io.EOF)
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_, err = f1.Write([]byte("line 2\n"))
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assert.NoError(t, err)
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line, err = f2r.ReadString('\n')
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assert.NoError(t, err)
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assert.Equal(t, "line 2\n", line)
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_, err = f2r.ReadString('\n')
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assert.ErrorIs(t, err, io.EOF)
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}
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func TestDbfsSeekWrite(t *testing.T) {
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defer test.MockVariableValue(&defaultFileBlockSize, 4)()
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// write something
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fw, err := OpenFile(t.Context(), "test2.log", os.O_RDWR|os.O_CREATE)
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require.NoError(t, err)
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defer fw.Close()
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n, err := fw.Write([]byte("111"))
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assert.NoError(t, err)
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_, err = fw.Seek(int64(n), io.SeekStart)
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assert.NoError(t, err)
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_, err = fw.Write([]byte("222"))
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assert.NoError(t, err)
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_, err = fw.Seek(int64(n), io.SeekStart)
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assert.NoError(t, err)
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_, err = fw.Write([]byte("333"))
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assert.NoError(t, err)
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// then read it
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fr, err := OpenFile(t.Context(), "test2.log", os.O_RDONLY)
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require.NoError(t, err)
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defer fr.Close()
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buf, err := io.ReadAll(fr)
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assert.NoError(t, err)
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assert.Equal(t, "111333", string(buf))
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}
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