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540 lines
13 KiB
540 lines
13 KiB
package autofile
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import (
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"bufio"
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"errors"
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"fmt"
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"io"
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"os"
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"path/filepath"
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"regexp"
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"strconv"
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"strings"
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"sync"
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"time"
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"github.com/tendermint/tendermint/libs/service"
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)
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const (
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defaultGroupCheckDuration = 5000 * time.Millisecond
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defaultHeadSizeLimit = 10 * 1024 * 1024 // 10MB
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defaultTotalSizeLimit = 1 * 1024 * 1024 * 1024 // 1GB
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maxFilesToRemove = 4 // needs to be greater than 1
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)
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/*
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You can open a Group to keep restrictions on an AutoFile, like
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the maximum size of each chunk, and/or the total amount of bytes
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stored in the group.
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The first file to be written in the Group.Dir is the head file.
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Dir/
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- <HeadPath>
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Once the Head file reaches the size limit, it will be rotated.
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Dir/
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- <HeadPath>.000 // First rolled file
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- <HeadPath> // New head path, starts empty.
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// The implicit index is 001.
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As more files are written, the index numbers grow...
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Dir/
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- <HeadPath>.000 // First rolled file
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- <HeadPath>.001 // Second rolled file
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- ...
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- <HeadPath> // New head path
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The Group can also be used to binary-search for some line,
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assuming that marker lines are written occasionally.
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*/
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type Group struct {
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service.BaseService
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ID string
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Head *AutoFile // The head AutoFile to write to
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headBuf *bufio.Writer
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Dir string // Directory that contains .Head
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ticker *time.Ticker
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mtx sync.Mutex
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headSizeLimit int64
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totalSizeLimit int64
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groupCheckDuration time.Duration
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minIndex int // Includes head
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maxIndex int // Includes head, where Head will move to
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// close this when the processTicks routine is done.
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// this ensures we can cleanup the dir after calling Stop
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// and the routine won't be trying to access it anymore
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doneProcessTicks chan struct{}
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// TODO: When we start deleting files, we need to start tracking GroupReaders
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// and their dependencies.
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}
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// OpenGroup creates a new Group with head at headPath. It returns an error if
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// it fails to open head file.
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func OpenGroup(headPath string, groupOptions ...func(*Group)) (*Group, error) {
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dir, err := filepath.Abs(filepath.Dir(headPath))
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if err != nil {
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return nil, err
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}
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head, err := OpenAutoFile(headPath)
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if err != nil {
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return nil, err
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}
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g := &Group{
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ID: "group:" + head.ID,
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Head: head,
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headBuf: bufio.NewWriterSize(head, 4096*10),
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Dir: dir,
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headSizeLimit: defaultHeadSizeLimit,
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totalSizeLimit: defaultTotalSizeLimit,
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groupCheckDuration: defaultGroupCheckDuration,
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minIndex: 0,
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maxIndex: 0,
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doneProcessTicks: make(chan struct{}),
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}
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for _, option := range groupOptions {
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option(g)
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}
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g.BaseService = *service.NewBaseService(nil, "Group", g)
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gInfo := g.readGroupInfo()
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g.minIndex = gInfo.MinIndex
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g.maxIndex = gInfo.MaxIndex
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return g, nil
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}
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// GroupCheckDuration allows you to overwrite default groupCheckDuration.
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func GroupCheckDuration(duration time.Duration) func(*Group) {
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return func(g *Group) {
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g.groupCheckDuration = duration
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}
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}
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// GroupHeadSizeLimit allows you to overwrite default head size limit - 10MB.
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func GroupHeadSizeLimit(limit int64) func(*Group) {
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return func(g *Group) {
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g.headSizeLimit = limit
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}
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}
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// GroupTotalSizeLimit allows you to overwrite default total size limit of the group - 1GB.
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func GroupTotalSizeLimit(limit int64) func(*Group) {
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return func(g *Group) {
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g.totalSizeLimit = limit
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}
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}
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// OnStart implements service.Service by starting the goroutine that checks file
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// and group limits.
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func (g *Group) OnStart() error {
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g.ticker = time.NewTicker(g.groupCheckDuration)
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go g.processTicks()
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return nil
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}
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// OnStop implements service.Service by stopping the goroutine described above.
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// NOTE: g.Head must be closed separately using Close.
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func (g *Group) OnStop() {
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g.ticker.Stop()
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if err := g.FlushAndSync(); err != nil {
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g.Logger.Error("Error flushin to disk", "err", err)
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}
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}
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// Wait blocks until all internal goroutines are finished. Supposed to be
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// called after Stop.
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func (g *Group) Wait() {
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// wait for processTicks routine to finish
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<-g.doneProcessTicks
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}
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// Close closes the head file. The group must be stopped by this moment.
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func (g *Group) Close() {
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if err := g.FlushAndSync(); err != nil {
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g.Logger.Error("Error flushin to disk", "err", err)
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}
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g.mtx.Lock()
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_ = g.Head.closeFile()
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g.mtx.Unlock()
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}
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// HeadSizeLimit returns the current head size limit.
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func (g *Group) HeadSizeLimit() int64 {
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g.mtx.Lock()
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defer g.mtx.Unlock()
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return g.headSizeLimit
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}
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// TotalSizeLimit returns total size limit of the group.
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func (g *Group) TotalSizeLimit() int64 {
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g.mtx.Lock()
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defer g.mtx.Unlock()
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return g.totalSizeLimit
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}
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// MaxIndex returns index of the last file in the group.
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func (g *Group) MaxIndex() int {
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g.mtx.Lock()
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defer g.mtx.Unlock()
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return g.maxIndex
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}
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// MinIndex returns index of the first file in the group.
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func (g *Group) MinIndex() int {
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g.mtx.Lock()
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defer g.mtx.Unlock()
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return g.minIndex
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}
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// Write writes the contents of p into the current head of the group. It
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// returns the number of bytes written. If nn < len(p), it also returns an
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// error explaining why the write is short.
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// NOTE: Writes are buffered so they don't write synchronously
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// TODO: Make it halt if space is unavailable
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func (g *Group) Write(p []byte) (nn int, err error) {
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g.mtx.Lock()
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defer g.mtx.Unlock()
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return g.headBuf.Write(p)
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}
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// WriteLine writes line into the current head of the group. It also appends "\n".
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// NOTE: Writes are buffered so they don't write synchronously
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// TODO: Make it halt if space is unavailable
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func (g *Group) WriteLine(line string) error {
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g.mtx.Lock()
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defer g.mtx.Unlock()
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_, err := g.headBuf.Write([]byte(line + "\n"))
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return err
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}
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// Buffered returns the size of the currently buffered data.
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func (g *Group) Buffered() int {
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g.mtx.Lock()
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defer g.mtx.Unlock()
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return g.headBuf.Buffered()
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}
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// FlushAndSync writes any buffered data to the underlying file and commits the
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// current content of the file to stable storage (fsync).
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func (g *Group) FlushAndSync() error {
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g.mtx.Lock()
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defer g.mtx.Unlock()
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err := g.headBuf.Flush()
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if err == nil {
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err = g.Head.Sync()
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}
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return err
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}
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func (g *Group) processTicks() {
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defer close(g.doneProcessTicks)
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for {
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select {
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case <-g.ticker.C:
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g.checkHeadSizeLimit()
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g.checkTotalSizeLimit()
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case <-g.Quit():
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return
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}
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}
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}
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// NOTE: this function is called manually in tests.
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func (g *Group) checkHeadSizeLimit() {
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limit := g.HeadSizeLimit()
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if limit == 0 {
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return
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}
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size, err := g.Head.Size()
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if err != nil {
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g.Logger.Error("Group's head may grow without bound", "head", g.Head.Path, "err", err)
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return
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}
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if size >= limit {
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g.RotateFile()
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}
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}
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func (g *Group) checkTotalSizeLimit() {
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limit := g.TotalSizeLimit()
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if limit == 0 {
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return
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}
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gInfo := g.readGroupInfo()
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totalSize := gInfo.TotalSize
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for i := 0; i < maxFilesToRemove; i++ {
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index := gInfo.MinIndex + i
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if totalSize < limit {
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return
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}
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if index == gInfo.MaxIndex {
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// Special degenerate case, just do nothing.
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g.Logger.Error("Group's head may grow without bound", "head", g.Head.Path)
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return
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}
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pathToRemove := filePathForIndex(g.Head.Path, index, gInfo.MaxIndex)
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fInfo, err := os.Stat(pathToRemove)
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if err != nil {
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g.Logger.Error("Failed to fetch info for file", "file", pathToRemove)
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continue
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}
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err = os.Remove(pathToRemove)
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if err != nil {
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g.Logger.Error("Failed to remove path", "path", pathToRemove)
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return
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}
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totalSize -= fInfo.Size()
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}
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}
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// RotateFile causes group to close the current head and assign it some index.
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// Note it does not create a new head.
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func (g *Group) RotateFile() {
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g.mtx.Lock()
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defer g.mtx.Unlock()
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headPath := g.Head.Path
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if err := g.headBuf.Flush(); err != nil {
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panic(err)
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}
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if err := g.Head.Sync(); err != nil {
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panic(err)
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}
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if err := g.Head.closeFile(); err != nil {
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panic(err)
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}
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indexPath := filePathForIndex(headPath, g.maxIndex, g.maxIndex+1)
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if err := os.Rename(headPath, indexPath); err != nil {
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panic(err)
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}
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g.maxIndex++
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}
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// NewReader returns a new group reader.
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// CONTRACT: Caller must close the returned GroupReader.
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func (g *Group) NewReader(index int) (*GroupReader, error) {
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r := newGroupReader(g)
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err := r.SetIndex(index)
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if err != nil {
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return nil, err
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}
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return r, nil
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}
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// GroupInfo holds information about the group.
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type GroupInfo struct {
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MinIndex int // index of the first file in the group, including head
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MaxIndex int // index of the last file in the group, including head
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TotalSize int64 // total size of the group
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HeadSize int64 // size of the head
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}
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// Returns info after scanning all files in g.Head's dir.
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func (g *Group) ReadGroupInfo() GroupInfo {
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g.mtx.Lock()
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defer g.mtx.Unlock()
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return g.readGroupInfo()
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}
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// Index includes the head.
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// CONTRACT: caller should have called g.mtx.Lock
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func (g *Group) readGroupInfo() GroupInfo {
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groupDir := filepath.Dir(g.Head.Path)
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headBase := filepath.Base(g.Head.Path)
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var minIndex, maxIndex int = -1, -1
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var totalSize, headSize int64 = 0, 0
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dir, err := os.Open(groupDir)
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if err != nil {
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panic(err)
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}
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defer dir.Close()
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fiz, err := dir.Readdir(0)
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if err != nil {
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panic(err)
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}
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// For each file in the directory, filter by pattern
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for _, fileInfo := range fiz {
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if fileInfo.Name() == headBase {
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fileSize := fileInfo.Size()
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totalSize += fileSize
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headSize = fileSize
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continue
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} else if strings.HasPrefix(fileInfo.Name(), headBase) {
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fileSize := fileInfo.Size()
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totalSize += fileSize
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indexedFilePattern := regexp.MustCompile(`^.+\.([0-9]{3,})$`)
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submatch := indexedFilePattern.FindSubmatch([]byte(fileInfo.Name()))
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if len(submatch) != 0 {
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// Matches
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fileIndex, err := strconv.Atoi(string(submatch[1]))
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if err != nil {
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panic(err)
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}
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if maxIndex < fileIndex {
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maxIndex = fileIndex
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}
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if minIndex == -1 || fileIndex < minIndex {
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minIndex = fileIndex
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}
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}
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}
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}
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// Now account for the head.
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if minIndex == -1 {
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// If there were no numbered files,
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// then the head is index 0.
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minIndex, maxIndex = 0, 0
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} else {
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// Otherwise, the head file is 1 greater
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maxIndex++
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}
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return GroupInfo{minIndex, maxIndex, totalSize, headSize}
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}
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func filePathForIndex(headPath string, index int, maxIndex int) string {
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if index == maxIndex {
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return headPath
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}
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return fmt.Sprintf("%v.%03d", headPath, index)
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}
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//--------------------------------------------------------------------------------
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// GroupReader provides an interface for reading from a Group.
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type GroupReader struct {
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*Group
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mtx sync.Mutex
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curIndex int
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curFile *os.File
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curReader *bufio.Reader
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curLine []byte
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}
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func newGroupReader(g *Group) *GroupReader {
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return &GroupReader{
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Group: g,
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curIndex: 0,
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curFile: nil,
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curReader: nil,
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curLine: nil,
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}
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}
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// Close closes the GroupReader by closing the cursor file.
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func (gr *GroupReader) Close() error {
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gr.mtx.Lock()
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defer gr.mtx.Unlock()
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if gr.curReader != nil {
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err := gr.curFile.Close()
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gr.curIndex = 0
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gr.curReader = nil
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gr.curFile = nil
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gr.curLine = nil
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return err
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}
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return nil
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}
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// Read implements io.Reader, reading bytes from the current Reader
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// incrementing index until enough bytes are read.
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func (gr *GroupReader) Read(p []byte) (n int, err error) {
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lenP := len(p)
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if lenP == 0 {
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return 0, errors.New("given empty slice")
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}
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gr.mtx.Lock()
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defer gr.mtx.Unlock()
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// Open file if not open yet
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if gr.curReader == nil {
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if err = gr.openFile(gr.curIndex); err != nil {
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return 0, err
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}
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}
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// Iterate over files until enough bytes are read
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var nn int
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for {
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nn, err = gr.curReader.Read(p[n:])
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n += nn
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switch {
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case err == io.EOF:
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if n >= lenP {
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return n, nil
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}
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// Open the next file
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if err1 := gr.openFile(gr.curIndex + 1); err1 != nil {
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return n, err1
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}
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case err != nil:
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return n, err
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case nn == 0: // empty file
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return n, err
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}
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}
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}
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// IF index > gr.Group.maxIndex, returns io.EOF
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// CONTRACT: caller should hold gr.mtx
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func (gr *GroupReader) openFile(index int) error {
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// Lock on Group to ensure that head doesn't move in the meanwhile.
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gr.Group.mtx.Lock()
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defer gr.Group.mtx.Unlock()
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if index > gr.Group.maxIndex {
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return io.EOF
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}
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curFilePath := filePathForIndex(gr.Head.Path, index, gr.Group.maxIndex)
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curFile, err := os.OpenFile(curFilePath, os.O_RDONLY|os.O_CREATE, autoFilePerms)
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if err != nil {
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return err
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}
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curReader := bufio.NewReader(curFile)
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// Update gr.cur*
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if gr.curFile != nil {
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gr.curFile.Close() // TODO return error?
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}
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gr.curIndex = index
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gr.curFile = curFile
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gr.curReader = curReader
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gr.curLine = nil
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return nil
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}
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// CurIndex returns cursor's file index.
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func (gr *GroupReader) CurIndex() int {
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gr.mtx.Lock()
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defer gr.mtx.Unlock()
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return gr.curIndex
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}
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// SetIndex sets the cursor's file index to index by opening a file at this
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// position.
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func (gr *GroupReader) SetIndex(index int) error {
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gr.mtx.Lock()
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defer gr.mtx.Unlock()
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return gr.openFile(index)
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}
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