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log module will be used for replication. (async)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,9 @@ | ||
| package log | ||
|
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| type Config struct { | ||
| Segment struct { | ||
| MaxStoreBytes uint64 | ||
| MaxIndexBytes uint64 | ||
| InitialOffset uint64 | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,93 @@ | ||
| package log | ||
|
|
||
| import ( | ||
| "io" | ||
| "os" | ||
|
|
||
| "github.com/tysonmote/gommap" | ||
| ) | ||
|
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| var ( | ||
| offWidth uint64 = 4 | ||
| posWidth uint64 = 8 | ||
| endWidth = offWidth + posWidth | ||
| ) | ||
|
|
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| type index struct { | ||
| file *os.File | ||
| mmap gommap.MMap | ||
| size uint64 | ||
| } | ||
|
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| func newIndex(f *os.File, c Config) (*index, error) { | ||
| idx := &index{ | ||
| file: f, | ||
| } | ||
| fi, err := os.Stat(f.Name()) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| idx.size = uint64(fi.Size()) | ||
| if err = os.Truncate( | ||
| f.Name(), int64(c.Segment.MaxIndexBytes), | ||
| ); err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| if idx.mmap, err = gommap.Map( | ||
| idx.file.Fd(), | ||
| gommap.PROT_READ|gommap.PROT_WRITE, | ||
| gommap.MAP_SHARED, | ||
| ); err != nil { | ||
| return nil, err | ||
| } | ||
| return idx, nil | ||
| } | ||
|
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| func (i *index) Close() error { | ||
| if err := i.mmap.Sync(gommap.MS_SYNC); err != nil { | ||
| return err | ||
| } | ||
| if err := i.file.Sync(); err != nil { | ||
| return err | ||
| } | ||
| if err := i.file.Truncate(int64(i.size)); err != nil { | ||
| return err | ||
| } | ||
|
|
||
| return i.file.Close() | ||
| } | ||
|
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| func (i *index) Read(in int64) (out uint32, pos uint64, err error) { | ||
| if i.size == 0 { | ||
| return 0, 0, io.EOF | ||
| } | ||
| if in == -1 { | ||
| out = uint32((i.size / endWidth) - 1) | ||
| } else { | ||
| out = uint32(in) | ||
| } | ||
| pos = uint64(out) * endWidth | ||
| if i.size < pos+endWidth { | ||
| return 0, 0, io.EOF | ||
| } | ||
| out = enc.Uint32(i.mmap[pos : pos+offWidth]) | ||
| pos = enc.Uint64(i.mmap[pos+offWidth : pos+endWidth]) | ||
| return out, pos, nil | ||
| } | ||
|
|
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| func (i *index) Write(off uint32, pos uint64) error { | ||
| if uint64(len(i.mmap)) < i.size+endWidth { | ||
| return io.EOF | ||
| } | ||
| enc.PutUint32(i.mmap[i.size:i.size+offWidth], off) | ||
| enc.PutUint64(i.mmap[i.size+offWidth:i.size+endWidth], pos) | ||
|
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| i.size += uint64(endWidth) | ||
| return nil | ||
| } | ||
|
|
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| func (i *index) Name() string { | ||
| return i.file.Name() | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,55 @@ | ||
| package log | ||
|
|
||
| import ( | ||
| "io" | ||
| "io/ioutil" | ||
| "os" | ||
| "testing" | ||
|
|
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| "github.com/stretchr/testify/require" | ||
| ) | ||
|
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| func TestIndex(t *testing.T) { | ||
| f, err := ioutil.TempFile(os.TempDir(), "index_test") | ||
| require.NoError(t, err) | ||
| defer os.Remove(f.Name()) | ||
|
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| c := Config{} | ||
| c.Segment.MaxIndexBytes = 1024 | ||
| idx, err := newIndex(f, c) | ||
| require.NoError(t, err) | ||
| _, _, err = idx.Read(-1) | ||
| require.Error(t, err) | ||
| require.Equal(t, f.Name(), idx.Name()) | ||
|
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| entries := []struct { | ||
| Off uint32 | ||
| Pos uint64 | ||
| }{ | ||
| {Off: 0, Pos: 0}, | ||
| {Off: 1, Pos: 10}, | ||
| } | ||
|
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| for _, want := range entries { | ||
| err = idx.Write(want.Off, want.Pos) | ||
| require.NoError(t, err) | ||
|
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| _, pos, err := idx.Read(int64(want.Off)) | ||
| require.NoError(t, err) | ||
| require.Equal(t, want.Pos, pos) | ||
| } | ||
|
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| // index and scanner should error when reading past existing entries | ||
| _, _, err = idx.Read(int64(len(entries))) | ||
| require.Equal(t, io.EOF, err) | ||
| _ = idx.Close() | ||
|
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| // index should build its state from the existing file | ||
| f, _ = os.OpenFile(f.Name(), os.O_RDWR, 0600) | ||
| idx, err = newIndex(f, c) | ||
| require.NoError(t, err) | ||
| off, pos, err := idx.Read(-1) | ||
| require.NoError(t, err) | ||
| require.Equal(t, uint32(1), off) | ||
| require.Equal(t, entries[1].Pos, pos) | ||
| } |
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