forked from couchbaselabs/cbgb
/
view_refresh.go
361 lines (338 loc) · 8.79 KB
/
view_refresh.go
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package main
import (
"bytes"
"encoding/base64"
"encoding/json"
"fmt"
"log"
"os"
"path/filepath"
"strings"
"sync/atomic"
"time"
"github.com/couchbaselabs/walrus"
"github.com/steveyen/gkvlite"
)
const (
VIEWS_FILE_SUFFIX = "views"
VINDEX_COLL_SUFFIX = ".v"
)
var viewRefreshPeriodic *periodically
func (v *VBucket) markStale() {
newval := atomic.AddInt64(&v.staleness, 1)
if newval == 1 {
viewRefreshPeriodic.Register(v.available, v.mkViewsRefreshFun())
}
}
func (v *VBucket) mkViewsRefreshFun() func(time.Time) bool {
return func(t time.Time) bool {
return v.periodicViewsRefresh(t)
}
}
func (v *VBucket) periodicViewsRefresh(time.Time) bool {
leftovers, _ := v.viewsRefresh()
return leftovers > 0
}
// Refreshes all views with the changes that happened since the last
// call to viewsRefresh().
func (v *VBucket) viewsRefresh() (int64, error) {
v.viewsLock.Lock()
defer v.viewsLock.Unlock()
d := atomic.LoadInt64(&v.staleness)
err := v.viewsRefresh_unlocked()
if err != nil {
return 0, err
}
return atomic.AddInt64(&v.staleness, -d), nil
}
func (v *VBucket) viewsRefresh_unlocked() error {
ddocs := v.parent.GetDDocs()
if ddocs == nil || len(*ddocs) <= 0 {
return nil
}
viewsStore, err := v.getViewsStore()
if err != nil {
return err
}
backIndex := viewsStore.getPartitionStore(v.vbid)
if backIndex == nil {
return fmt.Errorf("missing back index store, vbid: %v", v.vbid)
}
_, backIndexChanges := backIndex.colls()
// Need mutate() to be sync'ed with any compaction activity.
var backIndexLastChange *gkvlite.Item
backIndexLastChange, err = backIndexChanges.MaxItem(true)
if err != nil {
return err
}
var backIndexLastChangeBytes []byte
var backIndexLastChangeNum uint64
if backIndexLastChange != nil && len(backIndexLastChange.Key) > 0 {
backIndexLastChangeBytes = backIndexLastChange.Key
backIndexLastChangeNum, err = casBytesParse(backIndexLastChangeBytes)
if err != nil {
return err
}
}
errVisit := v.ps.visitChanges(backIndexLastChangeBytes, true,
func(i *item) bool {
if len(i.key) == 0 { // An empty key == metadata change.
return true
}
if i.cas <= backIndexLastChangeNum {
return true
}
err = v.viewsRefreshItem(ddocs, viewsStore, backIndex, i)
if err != nil {
return false
}
return true
})
if errVisit != nil {
return errVisit
}
return err
}
// Refreshes all views w.r.t. a single item/doc.
func (v *VBucket) viewsRefreshItem(ddocs *DDocs,
viewsStore *bucketstore, backIndex *partitionstore, i *item) error {
oldBackIndexItem, err := backIndex.get(i.key)
if err != nil {
return err
}
// TODO: One day do view hashing so view indexes are shared.
viewEmits := map[string]ViewRows{} // Keyed by "ddocId/viewId".
for ddocId, ddoc := range *ddocs {
for viewId, view := range ddoc.Views {
emits, err := v.execViewMapFunction(ddocId, ddoc, viewId, view, i)
if err != nil {
return err
}
viewEmits[ddocId+"/"+viewId] = emits
}
}
j, err := json.Marshal(viewEmits)
if err != nil {
return err
}
newBackIndexItem := &item{
key: i.key,
cas: i.cas,
data: j,
}
// TODO: Track size of backIndex as set() returns deltaItemBytes.
_, errSet := backIndex.setWithCallback(newBackIndexItem, oldBackIndexItem,
func() {
if oldBackIndexItem != nil {
var viewEmitsOld map[string]ViewRows
err = jsonUnmarshal(oldBackIndexItem.data, &viewEmitsOld)
if err != nil {
return
}
err = vindexesClear(viewsStore, i.key, viewEmitsOld)
if err != nil {
return
}
}
err = vindexesSet(viewsStore, i.key, viewEmits)
})
if errSet != nil {
return errSet
}
return err
}
// Executes the map function on an item.
func (v *VBucket) execViewMapFunction(ddocId string, ddoc *DDoc,
viewId string, view *View, i *item) (ViewRows, error) {
pvmf, err := view.GetViewMapFunction()
if err != nil {
return nil, err
}
docId := string(i.key)
docType := "json"
var doc interface{}
err = jsonUnmarshal(i.data, &doc)
if err != nil {
doc = base64.StdEncoding.EncodeToString(i.data)
docType = "base64"
}
odoc, err := OttoFromGo(pvmf.otto, doc)
if err != nil {
return nil, err
}
meta := map[string]interface{}{
"id": docId,
"type": docType,
}
ometa, err := OttoFromGo(pvmf.otto, meta)
if err != nil {
return nil, err
}
_, err = pvmf.mapf.Call(pvmf.mapf, odoc, ometa)
if err != nil {
// error executing map function should simply log it
// and emits no rows for this item
log.Printf("map function err, "+
"ddocId: %v, viewId: %v, docId: %v, err: %s",
ddocId, viewId, docId, err)
return nil, nil
}
emits, logs, errs := pvmf.restart()
if len(errs) > 0 {
for _, err := range errs {
err = fmt.Errorf("map function err, "+
"ddocId: %v, viewId: %v, docId: %v, err: %s",
ddocId, viewId, docId, err)
log.Printf("%v", err)
v.parent.PushErr(err)
}
return nil, errs[0]
}
for _, msg := range logs {
msg = fmt.Sprintf("map function log, "+
"ddocId: %v, viewId: %v, docId: %v, msg: %s",
ddocId, viewId, docId, msg)
log.Printf("%v", msg)
v.parent.PushLog(msg)
}
for _, emit := range emits {
emit.Id = docId
}
return emits, nil
}
func (v *VBucket) getViewsStore() (res *bucketstore, err error) {
v.Apply(func() {
if v.viewsStore == nil {
var vsp string
vsp, err = v.getViewsStorePath()
if err != nil {
return
}
v.viewsStore, err = newBucketStore(v.parent.Name()+"/v", vsp,
*v.parent.GetBucketSettings(),
viewKeyCompareForCollection)
}
res = v.viewsStore
})
return res, err
}
func (v *VBucket) getViewsStorePath() (path string, err error) {
dirForBucket, vfprefix := v.getViewsStorePathPrefix()
vfn := makeStoreFileName(vfprefix, 0, VIEWS_FILE_SUFFIX)
settings := v.parent.GetBucketSettings()
if settings.MemoryOnly < MemoryOnly_LEVEL_PERSIST_NOTHING {
vfn, err = latestStoreFileName(dirForBucket, vfprefix,
VIEWS_FILE_SUFFIX)
if err != nil {
return "", err
}
}
return filepath.Join(dirForBucket, vfn), nil
}
func (v *VBucket) getViewsStorePathPrefix() (dirForBucket, vfprefix string) {
dirForBucket = v.parent.GetBucketDir()
settings := v.parent.GetBucketSettings()
vfprefix = fmt.Sprintf("%s_%d", settings.UUID, v.vbid)
return dirForBucket, vfprefix
}
func (v *VBucket) clearViewsStore() (err error) {
v.Apply(func() {
// TODO: Rethink/recheck lock hierarchy here, to prevent
// deadlock and racing with concurrent flush & compaction.
v.viewsStore.apply(func() {
v.viewsStore.Close()
os.Remove(v.viewsStore.BSF().path)
v.viewsStore = nil
})
dirForBucket, vfprefix := v.getViewsStorePathPrefix()
vfiles, err := filepath.Glob(filepath.Join(dirForBucket,
vfprefix+"-*."+VIEWS_FILE_SUFFIX))
if err == nil {
for _, vfile := range vfiles {
os.Remove(vfile)
}
}
})
return err
}
func viewKeyCompareForCollection(collName string) gkvlite.KeyCompare {
if strings.HasSuffix(collName, VINDEX_COLL_SUFFIX) {
return vindexKeyCompare
}
return bytes.Compare
}
// Used to deletes previous emits from the vindexes.
func vindexesClear(viewsStore *bucketstore, docId []byte,
viewEmits map[string]ViewRows) error {
for vindexName, emits := range viewEmits {
vindex := viewsStore.collWithKeyCompare(vindexName+VINDEX_COLL_SUFFIX,
vindexKeyCompare)
for _, emit := range emits {
vk, err := vindexKey(docId, emit.Key)
if err != nil {
return err
}
_, err = vindex.Delete(vk)
if err != nil {
return err
}
}
}
return nil
}
// Used to incorporate emits into the vindexes.
func vindexesSet(viewsStore *bucketstore, docId []byte,
viewEmits map[string]ViewRows) error {
for vindexName, emits := range viewEmits {
vindex := viewsStore.collWithKeyCompare(vindexName+VINDEX_COLL_SUFFIX,
vindexKeyCompare)
for _, emit := range emits {
j, err := json.Marshal(emit.Value)
if err != nil {
return err
}
vk, err := vindexKey(docId, emit.Key)
if err != nil {
return err
}
err = vindex.Set(vk, j)
if err != nil {
return err
}
}
}
return nil
}
func vindexKeyCompare(a, b []byte) int {
docIdA, emitKeyA, err := vindexKeyParse(a)
if err != nil {
return bytes.Compare(a, b)
}
docIdB, emitKeyB, err := vindexKeyParse(b)
if err != nil {
return bytes.Compare(a, b)
}
c := walrus.CollateJSON(emitKeyA, emitKeyB)
if c == 0 {
return bytes.Compare(docIdA, docIdB)
}
return c
}
// Returns byte array that looks like "emitKey\0docId".
func vindexKey(docId []byte, emitKey interface{}) ([]byte, error) {
emitKeyBytes, err := json.Marshal(emitKey)
if err != nil {
return nil, err
}
return bytes.Join([][]byte{emitKeyBytes, docId}, []byte{0}), nil
}
func vindexKeyParse(k []byte) (docId []byte, emitKey interface{}, err error) {
parts := bytes.Split(k, []byte{0})
if len(parts) != 2 {
return nil, nil, fmt.Errorf("vindexKeyParse failed split: %v", k)
}
if err = jsonUnmarshal(parts[0], &emitKey); err != nil {
return nil, nil, err
}
return parts[1], emitKey, nil
}