mirror of https://github.com/tidwall/tile38.git
310 lines
8.2 KiB
Go
310 lines
8.2 KiB
Go
package server
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import (
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"math"
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"os"
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"strconv"
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"strings"
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"time"
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"github.com/tidwall/btree"
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"github.com/tidwall/geojson"
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"github.com/tidwall/tile38/core"
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"github.com/tidwall/tile38/internal/collection"
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"github.com/tidwall/tile38/internal/log"
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)
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const maxkeys = 8
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const maxids = 32
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const maxchunk = 4 * 1024 * 1024
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func (server *Server) aofshrink() {
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if server.aof == nil {
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return
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}
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start := time.Now()
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server.mu.Lock()
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if server.shrinking {
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server.mu.Unlock()
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return
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}
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server.shrinking = true
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server.shrinklog = nil
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server.mu.Unlock()
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defer func() {
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server.mu.Lock()
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server.shrinking = false
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server.shrinklog = nil
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server.mu.Unlock()
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log.Infof("aof shrink ended %v", time.Since(start))
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}()
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err := func() error {
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f, err := os.Create(core.AppendFileName + "-shrink")
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if err != nil {
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return err
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}
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defer f.Close()
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var aofbuf []byte
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var values []string
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var keys []string
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var nextkey string
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var keysdone bool
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for {
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if len(keys) == 0 {
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// load more keys
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if keysdone {
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break
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}
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keysdone = true
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func() {
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server.mu.Lock()
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defer server.mu.Unlock()
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server.scanGreaterOrEqual(nextkey, func(key string, col *collection.Collection) bool {
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if len(keys) == maxkeys {
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keysdone = false
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nextkey = key
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return false
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}
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keys = append(keys, key)
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return true
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})
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}()
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continue
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}
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var idsdone bool
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var nextid string
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for {
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if idsdone {
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keys = keys[1:]
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break
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}
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// load more objects
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func() {
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idsdone = true
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server.mu.Lock()
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defer server.mu.Unlock()
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col := server.getCol(keys[0])
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if col == nil {
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return
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}
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var fnames = col.FieldArr() // reload an array of field names to match each object
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var fmap = col.FieldMap() //
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var now = time.Now().UnixNano() // used for expiration
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var count = 0 // the object count
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col.ScanGreaterOrEqual(nextid, false, nil, nil,
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func(id string, obj geojson.Object, fields []float64, ex int64) bool {
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if count == maxids {
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// we reached the max number of ids for one batch
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nextid = id
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idsdone = false
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return false
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}
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// here we fill the values array with a new command
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values = values[:0]
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values = append(values, "set")
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values = append(values, keys[0])
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values = append(values, id)
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if len(fields) > 0 {
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fvs := orderFields(fmap, fnames, fields)
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for _, fv := range fvs {
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if fv.value != 0 {
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values = append(values, "field")
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values = append(values, fv.field)
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values = append(values, strconv.FormatFloat(fv.value, 'f', -1, 64))
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}
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}
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}
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if ex != 0 {
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ttl := math.Floor(float64(ex-now)/float64(time.Second)*10) / 10
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if ttl < 0.1 {
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// always leave a little bit of ttl.
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ttl = 0.1
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}
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values = append(values, "ex")
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values = append(values, strconv.FormatFloat(ttl, 'f', -1, 64))
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}
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if objIsSpatial(obj) {
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values = append(values, "object")
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values = append(values, string(obj.AppendJSON(nil)))
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} else {
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values = append(values, "string")
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values = append(values, obj.String())
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}
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// append the values to the aof buffer
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aofbuf = append(aofbuf, '*')
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aofbuf = append(aofbuf, strconv.FormatInt(int64(len(values)), 10)...)
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aofbuf = append(aofbuf, '\r', '\n')
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for _, value := range values {
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aofbuf = append(aofbuf, '$')
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aofbuf = append(aofbuf, strconv.FormatInt(int64(len(value)), 10)...)
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aofbuf = append(aofbuf, '\r', '\n')
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aofbuf = append(aofbuf, value...)
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aofbuf = append(aofbuf, '\r', '\n')
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}
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// increment the object count
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count++
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return true
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},
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)
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}()
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if len(aofbuf) > maxchunk {
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if _, err := f.Write(aofbuf); err != nil {
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return err
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}
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aofbuf = aofbuf[:0]
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}
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}
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}
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// load hooks
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// first load the names of the hooks
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var hnames []string
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func() {
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server.mu.Lock()
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defer server.mu.Unlock()
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hnames = make([]string, 0, server.hooks.Len())
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server.hooks.Walk(func(v []interface{}) {
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for _, v := range v {
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hnames = append(hnames, v.(*Hook).Name)
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}
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})
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}()
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var hookHint btree.PathHint
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for _, name := range hnames {
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func() {
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server.mu.Lock()
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defer server.mu.Unlock()
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hook, _ := server.hooks.GetHint(&Hook{Name: name}, &hookHint).(*Hook)
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if hook == nil {
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return
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}
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hook.cond.L.Lock()
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defer hook.cond.L.Unlock()
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var values []string
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if hook.channel {
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values = append(values, "setchan", name)
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} else {
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values = append(values, "sethook", name,
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strings.Join(hook.Endpoints, ","))
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}
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for _, meta := range hook.Metas {
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values = append(values, "meta", meta.Name, meta.Value)
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}
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if !hook.expires.IsZero() {
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ex := float64(time.Until(hook.expires)) / float64(time.Second)
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values = append(values, "ex",
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strconv.FormatFloat(ex, 'f', 1, 64))
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}
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values = append(values, hook.Message.Args...)
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// append the values to the aof buffer
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aofbuf = append(aofbuf, '*')
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aofbuf = append(aofbuf, strconv.FormatInt(int64(len(values)), 10)...)
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aofbuf = append(aofbuf, '\r', '\n')
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for _, value := range values {
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aofbuf = append(aofbuf, '$')
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aofbuf = append(aofbuf, strconv.FormatInt(int64(len(value)), 10)...)
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aofbuf = append(aofbuf, '\r', '\n')
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aofbuf = append(aofbuf, value...)
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aofbuf = append(aofbuf, '\r', '\n')
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}
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}()
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}
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if len(aofbuf) > 0 {
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if _, err := f.Write(aofbuf); err != nil {
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return err
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}
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aofbuf = aofbuf[:0]
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}
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if err := f.Sync(); err != nil {
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return err
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}
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// finally grab any new data that may have been written since
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// the aofshrink has started and swap out the files.
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return func() error {
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server.mu.Lock()
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defer server.mu.Unlock()
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// kill all followers connections and close their files. This
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// ensures that there is only one opened AOF at a time which is
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// what Windows requires in order to perform the Rename function
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// below.
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for conn, f := range server.aofconnM {
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conn.Close()
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f.Close()
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}
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// send a broadcast to all sleeping followers
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server.fcond.Broadcast()
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// flush the aof buffer
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server.flushAOF(false)
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aofbuf = aofbuf[:0]
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for _, values := range server.shrinklog {
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// append the values to the aof buffer
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aofbuf = append(aofbuf, '*')
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aofbuf = append(aofbuf, strconv.FormatInt(int64(len(values)), 10)...)
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aofbuf = append(aofbuf, '\r', '\n')
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for _, value := range values {
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aofbuf = append(aofbuf, '$')
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aofbuf = append(aofbuf, strconv.FormatInt(int64(len(value)), 10)...)
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aofbuf = append(aofbuf, '\r', '\n')
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aofbuf = append(aofbuf, value...)
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aofbuf = append(aofbuf, '\r', '\n')
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}
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}
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if _, err := f.Write(aofbuf); err != nil {
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return err
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}
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if err := f.Sync(); err != nil {
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return err
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}
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// we now have a shrunken aof file that is fully in-sync with
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// the current dataset. let's swap out the on disk files and
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// point to the new file.
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// anything below this point is unrecoverable. just log and exit process
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// back up the live aof, just in case of fatal error
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if err := server.aof.Close(); err != nil {
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log.Fatalf("shrink live aof close fatal operation: %v", err)
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}
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if err := f.Close(); err != nil {
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log.Fatalf("shrink new aof close fatal operation: %v", err)
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}
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if err := os.Rename(core.AppendFileName, core.AppendFileName+"-bak"); err != nil {
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log.Fatalf("shrink backup fatal operation: %v", err)
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}
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if err := os.Rename(core.AppendFileName+"-shrink", core.AppendFileName); err != nil {
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log.Fatalf("shrink rename fatal operation: %v", err)
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}
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server.aof, err = os.OpenFile(core.AppendFileName, os.O_CREATE|os.O_RDWR, 0600)
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if err != nil {
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log.Fatalf("shrink openfile fatal operation: %v", err)
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}
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var n int64
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n, err = server.aof.Seek(0, 2)
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if err != nil {
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log.Fatalf("shrink seek end fatal operation: %v", err)
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}
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server.aofsz = int(n)
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os.Remove(core.AppendFileName + "-bak") // ignore error
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return nil
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}()
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}()
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if err != nil {
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log.Errorf("aof shrink failed: %v", err)
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return
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}
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}
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