You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
533 lines
13 KiB
533 lines
13 KiB
package autofile
|
|
|
|
import (
|
|
"bufio"
|
|
"errors"
|
|
"fmt"
|
|
"io"
|
|
"os"
|
|
"path"
|
|
"path/filepath"
|
|
"regexp"
|
|
"strconv"
|
|
"strings"
|
|
"sync"
|
|
"time"
|
|
|
|
cmn "github.com/tendermint/tendermint/libs/common"
|
|
)
|
|
|
|
const (
|
|
defaultGroupCheckDuration = 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
|
|
stored in the group.
|
|
|
|
The first file to be written in the Group.Dir is the head file.
|
|
|
|
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.
|
|
|
|
As more files are written, the index numbers grow...
|
|
|
|
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.
|
|
*/
|
|
type Group struct {
|
|
cmn.BaseService
|
|
|
|
ID string
|
|
Head *AutoFile // The head AutoFile to write to
|
|
headBuf *bufio.Writer
|
|
Dir string // Directory that contains .Head
|
|
ticker *time.Ticker
|
|
mtx sync.Mutex
|
|
headSizeLimit int64
|
|
totalSizeLimit int64
|
|
groupCheckDuration time.Duration
|
|
minIndex int // Includes head
|
|
maxIndex int // Includes head, where Head will move to
|
|
|
|
// close this when the processTicks routine is done.
|
|
// this ensures we can cleanup the dir after calling Stop
|
|
// and the routine won't be trying to access it anymore
|
|
doneProcessTicks chan struct{}
|
|
|
|
// TODO: When we start deleting files, we need to start tracking GroupReaders
|
|
// and their dependencies.
|
|
}
|
|
|
|
// OpenGroup creates a new Group with head at headPath. It returns an error if
|
|
// it fails to open head file.
|
|
func OpenGroup(headPath string, groupOptions ...func(*Group)) (g *Group, err error) {
|
|
dir := path.Dir(headPath)
|
|
head, err := OpenAutoFile(headPath)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
g = &Group{
|
|
ID: "group:" + head.ID,
|
|
Head: head,
|
|
headBuf: bufio.NewWriterSize(head, 4096*10),
|
|
Dir: dir,
|
|
headSizeLimit: defaultHeadSizeLimit,
|
|
totalSizeLimit: defaultTotalSizeLimit,
|
|
groupCheckDuration: defaultGroupCheckDuration,
|
|
minIndex: 0,
|
|
maxIndex: 0,
|
|
doneProcessTicks: make(chan struct{}),
|
|
}
|
|
|
|
for _, option := range groupOptions {
|
|
option(g)
|
|
}
|
|
|
|
g.BaseService = *cmn.NewBaseService(nil, "Group", g)
|
|
|
|
gInfo := g.readGroupInfo()
|
|
g.minIndex = gInfo.MinIndex
|
|
g.maxIndex = gInfo.MaxIndex
|
|
return
|
|
}
|
|
|
|
// GroupCheckDuration allows you to overwrite default groupCheckDuration.
|
|
func GroupCheckDuration(duration time.Duration) func(*Group) {
|
|
return func(g *Group) {
|
|
g.groupCheckDuration = duration
|
|
}
|
|
}
|
|
|
|
// GroupHeadSizeLimit allows you to overwrite default head size limit - 10MB.
|
|
func GroupHeadSizeLimit(limit int64) func(*Group) {
|
|
return func(g *Group) {
|
|
g.headSizeLimit = limit
|
|
}
|
|
}
|
|
|
|
// GroupTotalSizeLimit allows you to overwrite default total size limit of the group - 1GB.
|
|
func GroupTotalSizeLimit(limit int64) func(*Group) {
|
|
return func(g *Group) {
|
|
g.totalSizeLimit = limit
|
|
}
|
|
}
|
|
|
|
// OnStart implements cmn.Service by starting the goroutine that checks file
|
|
// and group limits.
|
|
func (g *Group) OnStart() error {
|
|
g.ticker = time.NewTicker(g.groupCheckDuration)
|
|
go g.processTicks()
|
|
return nil
|
|
}
|
|
|
|
// OnStop implements cmn.Service by stopping the goroutine described above.
|
|
// NOTE: g.Head must be closed separately using Close.
|
|
func (g *Group) OnStop() {
|
|
g.ticker.Stop()
|
|
g.FlushAndSync()
|
|
}
|
|
|
|
// Wait blocks until all internal goroutines are finished. Supposed to be
|
|
// called after Stop.
|
|
func (g *Group) Wait() {
|
|
// wait for processTicks routine to finish
|
|
<-g.doneProcessTicks
|
|
}
|
|
|
|
// Close closes the head file. The group must be stopped by this moment.
|
|
func (g *Group) Close() {
|
|
g.FlushAndSync()
|
|
|
|
g.mtx.Lock()
|
|
_ = g.Head.closeFile()
|
|
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
|
|
}
|
|
|
|
// 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
|
|
}
|
|
|
|
// 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 {
|
|
g.mtx.Lock()
|
|
defer g.mtx.Unlock()
|
|
_, err := g.headBuf.Write([]byte(line + "\n"))
|
|
return err
|
|
}
|
|
|
|
// Buffered returns the size of the currently buffered data.
|
|
func (g *Group) Buffered() int {
|
|
g.mtx.Lock()
|
|
defer g.mtx.Unlock()
|
|
return g.headBuf.Buffered()
|
|
}
|
|
|
|
// FlushAndSync writes any buffered data to the underlying file and commits the
|
|
// current content of the file to stable storage (fsync).
|
|
func (g *Group) FlushAndSync() error {
|
|
g.mtx.Lock()
|
|
defer g.mtx.Unlock()
|
|
err := g.headBuf.Flush()
|
|
if err == nil {
|
|
err = g.Head.Sync()
|
|
}
|
|
return err
|
|
}
|
|
|
|
func (g *Group) processTicks() {
|
|
defer close(g.doneProcessTicks)
|
|
for {
|
|
select {
|
|
case <-g.ticker.C:
|
|
g.checkHeadSizeLimit()
|
|
g.checkTotalSizeLimit()
|
|
case <-g.Quit():
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
// NOTE: this function is called manually in tests.
|
|
func (g *Group) checkHeadSizeLimit() {
|
|
limit := g.HeadSizeLimit()
|
|
if limit == 0 {
|
|
return
|
|
}
|
|
size, err := g.Head.Size()
|
|
if err != nil {
|
|
g.Logger.Error("Group's head may grow without bound", "head", g.Head.Path, "err", err)
|
|
return
|
|
}
|
|
if size >= limit {
|
|
g.RotateFile()
|
|
}
|
|
}
|
|
|
|
func (g *Group) checkTotalSizeLimit() {
|
|
limit := g.TotalSizeLimit()
|
|
if limit == 0 {
|
|
return
|
|
}
|
|
|
|
gInfo := g.readGroupInfo()
|
|
totalSize := gInfo.TotalSize
|
|
for i := 0; i < maxFilesToRemove; i++ {
|
|
index := gInfo.MinIndex + i
|
|
if totalSize < limit {
|
|
return
|
|
}
|
|
if index == gInfo.MaxIndex {
|
|
// Special degenerate case, just do nothing.
|
|
g.Logger.Error("Group's head may grow without bound", "head", g.Head.Path)
|
|
return
|
|
}
|
|
pathToRemove := filePathForIndex(g.Head.Path, index, gInfo.MaxIndex)
|
|
fInfo, err := os.Stat(pathToRemove)
|
|
if err != nil {
|
|
g.Logger.Error("Failed to fetch info for file", "file", pathToRemove)
|
|
continue
|
|
}
|
|
err = os.Remove(pathToRemove)
|
|
if err != nil {
|
|
g.Logger.Error("Failed to remove path", "path", pathToRemove)
|
|
return
|
|
}
|
|
totalSize -= fInfo.Size()
|
|
}
|
|
}
|
|
|
|
// 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()
|
|
|
|
headPath := g.Head.Path
|
|
|
|
if err := g.headBuf.Flush(); err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
if err := g.Head.Sync(); err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
if err := g.Head.closeFile(); err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
indexPath := filePathForIndex(headPath, g.maxIndex, g.maxIndex+1)
|
|
if err := os.Rename(headPath, indexPath); err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
g.maxIndex++
|
|
}
|
|
|
|
// 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)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return r, nil
|
|
}
|
|
|
|
// GroupInfo holds information about the group.
|
|
type GroupInfo struct {
|
|
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.
|
|
func (g *Group) ReadGroupInfo() GroupInfo {
|
|
g.mtx.Lock()
|
|
defer g.mtx.Unlock()
|
|
return g.readGroupInfo()
|
|
}
|
|
|
|
// Index includes the head.
|
|
// CONTRACT: caller should have called g.mtx.Lock
|
|
func (g *Group) readGroupInfo() GroupInfo {
|
|
groupDir := filepath.Dir(g.Head.Path)
|
|
headBase := filepath.Base(g.Head.Path)
|
|
var minIndex, maxIndex int = -1, -1
|
|
var totalSize, headSize int64 = 0, 0
|
|
|
|
dir, err := os.Open(groupDir)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
defer dir.Close()
|
|
fiz, err := dir.Readdir(0)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
// For each file in the directory, filter by pattern
|
|
for _, fileInfo := range fiz {
|
|
if fileInfo.Name() == headBase {
|
|
fileSize := fileInfo.Size()
|
|
totalSize += fileSize
|
|
headSize = fileSize
|
|
continue
|
|
} else if strings.HasPrefix(fileInfo.Name(), headBase) {
|
|
fileSize := fileInfo.Size()
|
|
totalSize += fileSize
|
|
indexedFilePattern := regexp.MustCompile(`^.+\.([0-9]{3,})$`)
|
|
submatch := indexedFilePattern.FindSubmatch([]byte(fileInfo.Name()))
|
|
if len(submatch) != 0 {
|
|
// Matches
|
|
fileIndex, err := strconv.Atoi(string(submatch[1]))
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
if maxIndex < fileIndex {
|
|
maxIndex = fileIndex
|
|
}
|
|
if minIndex == -1 || fileIndex < minIndex {
|
|
minIndex = fileIndex
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Now account for the head.
|
|
if minIndex == -1 {
|
|
// If there were no numbered files,
|
|
// then the head is index 0.
|
|
minIndex, maxIndex = 0, 0
|
|
} else {
|
|
// Otherwise, the head file is 1 greater
|
|
maxIndex++
|
|
}
|
|
return GroupInfo{minIndex, maxIndex, totalSize, headSize}
|
|
}
|
|
|
|
func filePathForIndex(headPath string, index int, maxIndex int) string {
|
|
if index == maxIndex {
|
|
return headPath
|
|
}
|
|
return fmt.Sprintf("%v.%03d", headPath, index)
|
|
}
|
|
|
|
//--------------------------------------------------------------------------------
|
|
|
|
// GroupReader provides an interface for reading from a Group.
|
|
type GroupReader struct {
|
|
*Group
|
|
mtx sync.Mutex
|
|
curIndex int
|
|
curFile *os.File
|
|
curReader *bufio.Reader
|
|
curLine []byte
|
|
}
|
|
|
|
func newGroupReader(g *Group) *GroupReader {
|
|
return &GroupReader{
|
|
Group: g,
|
|
curIndex: 0,
|
|
curFile: nil,
|
|
curReader: nil,
|
|
curLine: nil,
|
|
}
|
|
}
|
|
|
|
// Close closes the GroupReader by closing the cursor file.
|
|
func (gr *GroupReader) Close() error {
|
|
gr.mtx.Lock()
|
|
defer gr.mtx.Unlock()
|
|
|
|
if gr.curReader != nil {
|
|
err := gr.curFile.Close()
|
|
gr.curIndex = 0
|
|
gr.curReader = nil
|
|
gr.curFile = nil
|
|
gr.curLine = nil
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// 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 {
|
|
if n >= lenP {
|
|
return n, nil
|
|
}
|
|
// Open the next file
|
|
if err1 := gr.openFile(gr.curIndex + 1); err1 != nil {
|
|
return n, err1
|
|
}
|
|
} else if err != nil {
|
|
return n, err
|
|
} else if nn == 0 { // empty file
|
|
return n, err
|
|
}
|
|
}
|
|
}
|
|
|
|
// IF index > gr.Group.maxIndex, returns io.EOF
|
|
// CONTRACT: caller should hold gr.mtx
|
|
func (gr *GroupReader) openFile(index int) error {
|
|
// Lock on Group to ensure that head doesn't move in the meanwhile.
|
|
gr.Group.mtx.Lock()
|
|
defer gr.Group.mtx.Unlock()
|
|
|
|
if index > gr.Group.maxIndex {
|
|
return io.EOF
|
|
}
|
|
|
|
curFilePath := filePathForIndex(gr.Head.Path, index, gr.Group.maxIndex)
|
|
curFile, err := os.OpenFile(curFilePath, os.O_RDONLY|os.O_CREATE, autoFilePerms)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
curReader := bufio.NewReader(curFile)
|
|
|
|
// Update gr.cur*
|
|
if gr.curFile != nil {
|
|
gr.curFile.Close() // TODO return error?
|
|
}
|
|
gr.curIndex = index
|
|
gr.curFile = curFile
|
|
gr.curReader = curReader
|
|
gr.curLine = nil
|
|
return nil
|
|
}
|
|
|
|
// 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()
|
|
return gr.openFile(index)
|
|
}
|