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Merge pull request #65 from tendermint/573-wal-issues-2

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[autofile] Support for the new WAL format
This commit is contained in:
Ethan Buchman 2017-10-25 22:00:36 -04:00 committed by GitHub
commit b30e3ba26d
2 changed files with 196 additions and 27 deletions
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132
autofile/group.go
View File

@ -18,6 +18,13 @@ import (
. "github.com/tendermint/tmlibs/common"
)
const (
groupCheckDuration = 5000 * time.Millisecond
defaultHeadSizeLimit = 10 * 1024 * 1024 // 10MB
defaultTotalSizeLimit = 1 * 1024 * 1024 * 1024 // 1GB
maxFilesToRemove = 4 // needs to be greater than 1
)
/*
You can open a Group to keep restrictions on an AutoFile, like
the maximum size of each chunk, and/or the total amount of bytes
@ -25,33 +32,27 @@ stored in the group.
The first file to be written in the Group.Dir is the head file.
Dir/
- <HeadPath>
Dir/
- <HeadPath>
Once the Head file reaches the size limit, it will be rotated.
Dir/
- <HeadPath>.000 // First rolled file
- <HeadPath> // New head path, starts empty.
// The implicit index is 001.
Dir/
- <HeadPath>.000 // First rolled file
- <HeadPath> // New head path, starts empty.
// The implicit index is 001.
As more files are written, the index numbers grow...
Dir/
- <HeadPath>.000 // First rolled file
- <HeadPath>.001 // Second rolled file
- ...
- <HeadPath> // New head path
Dir/
- <HeadPath>.000 // First rolled file
- <HeadPath>.001 // Second rolled file
- ...
- <HeadPath> // New head path
The Group can also be used to binary-search for some line,
assuming that marker lines are written occasionally.
*/
const groupCheckDuration = 5000 * time.Millisecond
const defaultHeadSizeLimit = 10 * 1024 * 1024 // 10MB
const defaultTotalSizeLimit = 1 * 1024 * 1024 * 1024 // 1GB
const maxFilesToRemove = 4 // needs to be greater than 1
type Group struct {
BaseService
@ -109,37 +110,61 @@ func (g *Group) OnStop() {
g.ticker.Stop()
}
// SetHeadSizeLimit allows you to overwrite default head size limit - 10MB.
func (g *Group) SetHeadSizeLimit(limit int64) {
g.mtx.Lock()
g.headSizeLimit = limit
g.mtx.Unlock()
}
// HeadSizeLimit returns the current head size limit.
func (g *Group) HeadSizeLimit() int64 {
g.mtx.Lock()
defer g.mtx.Unlock()
return g.headSizeLimit
}
// SetTotalSizeLimit allows you to overwrite default total size limit of the
// group - 1GB.
func (g *Group) SetTotalSizeLimit(limit int64) {
g.mtx.Lock()
g.totalSizeLimit = limit
g.mtx.Unlock()
}
// TotalSizeLimit returns total size limit of the group.
func (g *Group) TotalSizeLimit() int64 {
g.mtx.Lock()
defer g.mtx.Unlock()
return g.totalSizeLimit
}
// MaxIndex returns index of the last file in the group.
func (g *Group) MaxIndex() int {
g.mtx.Lock()
defer g.mtx.Unlock()
return g.maxIndex
}
// Auto appends "\n"
// MinIndex returns index of the first file in the group.
func (g *Group) MinIndex() int {
g.mtx.Lock()
defer g.mtx.Unlock()
return g.minIndex
}
// Write writes the contents of p into the current head of the group. It
// returns the number of bytes written. If nn < len(p), it also returns an
// error explaining why the write is short.
// NOTE: Writes are buffered so they don't write synchronously
// TODO: Make it halt if space is unavailable
func (g *Group) Write(p []byte) (nn int, err error) {
g.mtx.Lock()
defer g.mtx.Unlock()
return g.headBuf.Write(p)
}
// WriteLine writes line into the current head of the group. It also appends "\n".
// NOTE: Writes are buffered so they don't write synchronously
// TODO: Make it halt if space is unavailable
func (g *Group) WriteLine(line string) error {
@ -149,6 +174,8 @@ func (g *Group) WriteLine(line string) error {
return err
}
// Flush writes any buffered data to the underlying file and commits the
// current content of the file to stable storage.
func (g *Group) Flush() error {
g.mtx.Lock()
defer g.mtx.Unlock()
@ -223,6 +250,8 @@ func (g *Group) checkTotalSizeLimit() {
}
}
// RotateFile causes group to close the current head and assign it some index.
// Note it does not create a new head.
func (g *Group) RotateFile() {
g.mtx.Lock()
defer g.mtx.Unlock()
@ -241,8 +270,8 @@ func (g *Group) RotateFile() {
g.maxIndex += 1
}
// NOTE: if error, returns no GroupReader.
// CONTRACT: Caller must close the returned GroupReader
// NewReader returns a new group reader.
// CONTRACT: Caller must close the returned GroupReader.
func (g *Group) NewReader(index int) (*GroupReader, error) {
r := newGroupReader(g)
err := r.SetIndex(index)
@ -423,14 +452,15 @@ GROUP_LOOP:
return
}
// GroupInfo holds information about the group.
type GroupInfo struct {
MinIndex int
MaxIndex int
TotalSize int64
HeadSize int64
MinIndex int // index of the first file in the group, including head
MaxIndex int // index of the last file in the group, including head
TotalSize int64 // total size of the group
HeadSize int64 // size of the head
}
// Returns info after scanning all files in g.Head's dir
// Returns info after scanning all files in g.Head's dir.
func (g *Group) ReadGroupInfo() GroupInfo {
g.mtx.Lock()
defer g.mtx.Unlock()
@ -505,6 +535,7 @@ func filePathForIndex(headPath string, index int, maxIndex int) string {
//--------------------------------------------------------------------------------
// GroupReader provides an interface for reading from a Group.
type GroupReader struct {
*Group
mtx sync.Mutex
@ -524,6 +555,7 @@ func newGroupReader(g *Group) *GroupReader {
}
}
// Close closes the GroupReader by closing the cursor file.
func (gr *GroupReader) Close() error {
gr.mtx.Lock()
defer gr.mtx.Unlock()
@ -540,7 +572,48 @@ func (gr *GroupReader) Close() error {
}
}
// Reads a line (without delimiter)
// Read implements io.Reader, reading bytes from the current Reader
// incrementing index until enough bytes are read.
func (gr *GroupReader) Read(p []byte) (n int, err error) {
lenP := len(p)
if lenP == 0 {
return 0, errors.New("given empty slice")
}
gr.mtx.Lock()
defer gr.mtx.Unlock()
// Open file if not open yet
if gr.curReader == nil {
if err = gr.openFile(gr.curIndex); err != nil {
return 0, err
}
}
// Iterate over files until enough bytes are read
var nn int
for {
nn, err = gr.curReader.Read(p[n:])
n += nn
if err == io.EOF {
// Open the next file
if err1 := gr.openFile(gr.curIndex + 1); err1 != nil {
return n, err1
}
if n >= lenP {
return n, nil
} else {
continue
}
} else if err != nil {
return n, err
} else if nn == 0 { // empty file
return n, err
}
}
}
// ReadLine reads a line (without delimiter).
// just return io.EOF if no new lines found.
func (gr *GroupReader) ReadLine() (string, error) {
gr.mtx.Lock()
@ -613,6 +686,9 @@ func (gr *GroupReader) openFile(index int) error {
return nil
}
// PushLine makes the given line the current one, so the next time somebody
// calls ReadLine, this line will be returned.
// panics if called twice without calling ReadLine.
func (gr *GroupReader) PushLine(line string) {
gr.mtx.Lock()
defer gr.mtx.Unlock()
@ -624,13 +700,15 @@ func (gr *GroupReader) PushLine(line string) {
}
}
// Cursor's file index.
// CurIndex returns cursor's file index.
func (gr *GroupReader) CurIndex() int {
gr.mtx.Lock()
defer gr.mtx.Unlock()
return gr.curIndex
}
// SetIndex sets the cursor's file index to index by opening a file at this
// position.
func (gr *GroupReader) SetIndex(index int) error {
gr.mtx.Lock()
defer gr.mtx.Unlock()

91
autofile/group_test.go
View File

@ -1,6 +1,7 @@
package autofile
import (
"bytes"
"errors"
"io"
"io/ioutil"
@ -400,3 +401,93 @@ func TestFindLast4(t *testing.T) {
// Cleanup
destroyTestGroup(t, g)
}
func TestWrite(t *testing.T) {
g := createTestGroup(t, 0)
written := []byte("Medusa")
g.Write(written)
g.Flush()
read := make([]byte, len(written))
gr, err := g.NewReader(0)
if err != nil {
t.Fatalf("Failed to create reader: %v", err)
}
_, err = gr.Read(read)
if err != nil {
t.Fatalf("Failed to read data: %v", err)
}
if !bytes.Equal(written, read) {
t.Errorf("%s, %s should be equal", string(written), string(read))
}
// Cleanup
destroyTestGroup(t, g)
}
func TestGroupReaderRead(t *testing.T) {
g := createTestGroup(t, 0)
professor := []byte("Professor Monster")
g.Write(professor)
g.Flush()
g.RotateFile()
frankenstein := []byte("Frankenstein's Monster")
g.Write(frankenstein)
g.Flush()
totalWrittenLength := len(professor) + len(frankenstein)
read := make([]byte, totalWrittenLength)
gr, err := g.NewReader(0)
if err != nil {
t.Fatalf("Failed to create reader: %v", err)
}
n, err := gr.Read(read)
if err != nil {
t.Fatalf("Failed to read data: %v", err)
}
if n != totalWrittenLength {
t.Errorf("Failed to read enough bytes: wanted %d, but read %d", totalWrittenLength, n)
}
professorPlusFrankenstein := professor
professorPlusFrankenstein = append(professorPlusFrankenstein, frankenstein...)
if !bytes.Equal(read, professorPlusFrankenstein) {
t.Errorf("%s, %s should be equal", string(professorPlusFrankenstein), string(read))
}
// Cleanup
destroyTestGroup(t, g)
}
func TestMinIndex(t *testing.T) {
g := createTestGroup(t, 0)
if g.MinIndex() != 0 {
t.Error("MinIndex should be zero at the beginning")
}
// Cleanup
destroyTestGroup(t, g)
}
func TestMaxIndex(t *testing.T) {
g := createTestGroup(t, 0)
if g.MaxIndex() != 0 {
t.Error("MaxIndex should be zero at the beginning")
}
g.WriteLine("Line 1")
g.Flush()
g.RotateFile()
if g.MaxIndex() != 1 {
t.Error("MaxIndex should point to the last file")
}
// Cleanup
destroyTestGroup(t, g)
}