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bitmaps.go
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bitmaps.go
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package basalt
import (
"encoding/binary"
"fmt"
"io"
"sync"
"github.com/RoaringBitmap/roaring"
"github.com/smallnest/log"
)
// OP bitmaps operations
type OP byte
const (
BmOpAdd OP = 1
BmOpAddMany = 2
BmOpRemove = 3
BmOpDrop = 4
BmOpClear = 5
)
// Bitmaps contains all bitmaps of namespace.
type Bitmaps struct {
mu sync.RWMutex
bitmaps map[string]*Bitmap
writeCallback func(op OP, value string)
}
// NewBitmaps creates a Bitmaps.
func NewBitmaps() *Bitmaps {
return &Bitmaps{
bitmaps: make(map[string]*Bitmap),
}
}
// Bitmap is the goroutine-safe bitmap.
type Bitmap struct {
mu sync.RWMutex
bitmap *roaring.Bitmap
}
// Add adds a value.
func (bs *Bitmaps) Add(name string, v uint32, callback bool) {
if bs.writeCallback != nil && callback {
bs.writeCallback(BmOpAdd, fmt.Sprintf("%s,%d", name, v))
return
}
bs.mu.Lock()
bm := bs.bitmaps[name]
if bm == nil {
bm = &Bitmap{
bitmap: roaring.NewBitmap(),
}
bs.bitmaps[name] = bm
}
bs.mu.Unlock()
bm.mu.Lock()
bm.bitmap.Add(v)
bm.mu.Unlock()
}
// AddMany adds multiple values.
func (bs *Bitmaps) AddMany(name string, v []uint32, callback bool) {
if bs.writeCallback != nil && callback {
bs.writeCallback(BmOpAddMany, fmt.Sprintf("%s,%d", name, ints2str(v)))
return
}
bs.mu.Lock()
bm := bs.bitmaps[name]
if bm == nil {
bm = &Bitmap{
bitmap: roaring.NewBitmap(),
}
bs.bitmaps[name] = bm
}
bs.mu.Unlock()
bm.mu.Lock()
bm.bitmap.AddMany(v)
bm.mu.Unlock()
}
// Remove removes a value.
func (bs *Bitmaps) Remove(name string, v uint32, callback bool) {
if bs.writeCallback != nil && callback {
bs.writeCallback(BmOpRemove, fmt.Sprintf("%s,%d", name, v))
return
}
bs.mu.Lock()
bm := bs.bitmaps[name]
if bm == nil {
bm = &Bitmap{
bitmap: roaring.NewBitmap(),
}
bs.bitmaps[name] = bm
}
bs.mu.Unlock()
bm.mu.Lock()
bm.bitmap.Remove(v)
bm.mu.Unlock()
}
// RemoveBitmap removes a bitmap.
func (bs *Bitmaps) RemoveBitmap(name string, callback bool) {
if bs.writeCallback != nil && callback {
bs.writeCallback(BmOpDrop, name)
return
}
bs.mu.Lock()
delete(bs.bitmaps, name)
bs.mu.Unlock()
}
// ClearBitmap clear a bitmap.
func (bs *Bitmaps) ClearBitmap(name string, callback bool) {
if bs.writeCallback != nil && callback {
bs.writeCallback(BmOpClear, name)
return
}
bs.mu.RLock()
bm := bs.bitmaps[name]
if bm == nil {
bs.mu.RUnlock()
return
}
bs.mu.RUnlock()
bm.bitmap.Clear()
}
// Exists checks whether a value exists.
func (bs *Bitmaps) Exists(name string, v uint32) bool {
bs.mu.RLock()
bm := bs.bitmaps[name]
if bm == nil {
bs.mu.RUnlock()
return false
}
bs.mu.RUnlock()
bm.mu.RLock()
existed := bm.bitmap.Contains(v)
bm.mu.RUnlock()
return existed
}
// Card returns the number of integers contained in the bitmap.
func (bs *Bitmaps) Card(name string) uint64 {
bs.mu.RLock()
bm := bs.bitmaps[name]
if bm == nil {
bs.mu.RUnlock()
return 0
}
bs.mu.RUnlock()
bm.mu.RLock()
num := bm.bitmap.GetCardinality()
bm.mu.RUnlock()
return num
}
type Stats struct {
Cardinality uint64
Containers uint64
ArrayContainers uint64
ArrayContainerBytes uint64
ArrayContainerValues uint64
BitmapContainers uint64
BitmapContainerBytes uint64
BitmapContainerValues uint64
RunContainers uint64
RunContainerBytes uint64
RunContainerValues uint64
}
// Stats gets the stats of named bitmap.
func (bs *Bitmaps) Stats(name string) Stats {
bs.mu.RLock()
bm := bs.bitmaps[name]
if bm == nil {
bs.mu.RUnlock()
return Stats{}
}
bs.mu.RUnlock()
bm.mu.RLock()
stats := bm.bitmap.Stats()
bm.mu.RUnlock()
return Stats(stats)
}
func (bs *Bitmaps) intersection(names ...string) *roaring.Bitmap {
var bms []*roaring.Bitmap
bs.mu.RLock()
for _, name := range names {
bm := bs.bitmaps[name]
if bm == nil {
bs.mu.RUnlock()
return nil
}
bms = append(bms, bm.bitmap)
}
bs.mu.RUnlock()
return roaring.ParAnd(0, bms...)
}
// Inter computes the intersection (AND) of all provided bitmaps.
func (bs *Bitmaps) Inter(names ...string) []uint32 {
bm := bs.intersection(names...)
if bm == nil {
return nil
}
return bm.ToArray()
}
// InterStore computes the intersection (AND) of all provided bitmaps and save to destination.
func (bs *Bitmaps) InterStore(destination string, names ...string) uint64 {
bm := bs.intersection(names...)
if bm == nil {
return 0
}
bs.mu.Lock()
bs.bitmaps[destination] = &Bitmap{bitmap: bm}
bs.mu.Unlock()
return bm.GetCardinality()
}
func (bs *Bitmaps) union(names ...string) *roaring.Bitmap {
var bms []*roaring.Bitmap
bs.mu.RLock()
for _, name := range names {
bm := bs.bitmaps[name]
if bm != nil {
bms = append(bms, bm.bitmap)
}
}
bs.mu.RUnlock()
return roaring.ParHeapOr(0, bms...)
}
// Union computes the union (OR) of all provided bitmaps.
func (bs *Bitmaps) Union(names ...string) []uint32 {
bm := bs.union(names...)
return bm.ToArray()
}
// UnionStore computes the union (OR) of all provided bitmaps and store to destination.
func (bs *Bitmaps) UnionStore(destination string, names ...string) uint64 {
bm := bs.union(names...)
bs.mu.Lock()
bs.bitmaps[destination] = &Bitmap{bitmap: bm}
bs.mu.Unlock()
return bm.GetCardinality()
}
func (bs *Bitmaps) xor(name1, name2 string) *roaring.Bitmap {
var rbm1, rbm2 *roaring.Bitmap
bs.mu.RLock()
bm1 := bs.bitmaps[name1]
if bm1 == nil {
rbm1 = roaring.NewBitmap()
} else {
rbm1 = bm1.bitmap
}
bm2 := bs.bitmaps[name2]
if bm2 == nil {
rbm2 = roaring.NewBitmap()
} else {
rbm2 = bm2.bitmap
}
bs.mu.RUnlock()
return roaring.Xor(rbm1, rbm2)
}
// Xor computes the symmetric difference between two bitmaps and returns the result
func (bs *Bitmaps) Xor(name1, name2 string) []uint32 {
bm := bs.xor(name1, name2)
return bm.ToArray()
}
// XorStore computes the symmetric difference between two bitmaps and save the result to destination.
func (bs *Bitmaps) XorStore(destination, name1, name2 string) uint64 {
bm := bs.xor(name1, name2)
bs.mu.Lock()
bs.bitmaps[destination] = &Bitmap{bitmap: bm}
bs.mu.Unlock()
return bm.GetCardinality()
}
func (bs *Bitmaps) diff(name1, name2 string) *roaring.Bitmap {
var rbm1, rbm2 *roaring.Bitmap
bs.mu.RLock()
bm1 := bs.bitmaps[name1]
if bm1 == nil {
rbm1 = roaring.NewBitmap()
} else {
rbm1 = bm1.bitmap
}
bm2 := bs.bitmaps[name2]
if bm2 == nil {
rbm2 = roaring.NewBitmap()
} else {
rbm2 = bm2.bitmap
}
bs.mu.RUnlock()
return roaring.AndNot(rbm1, rbm2)
}
// Diff computes the difference between two bitmaps and returns the result.
func (bs *Bitmaps) Diff(name1, name2 string) []uint32 {
bm := bs.diff(name1, name2)
return bm.ToArray()
}
// DiffStore computes the difference between two bitmaps and save the result to destination.
func (bs *Bitmaps) DiffStore(destination, name1, name2 string) uint64 {
bm := bs.diff(name1, name2)
bs.mu.Lock()
bs.bitmaps[destination] = &Bitmap{bitmap: bm}
bs.mu.Unlock()
return bm.GetCardinality()
}
// Save saves bitmaps to the io.Writer.
func (bs *Bitmaps) Save(w io.Writer) error {
var keys []string
bs.mu.RLock()
for k := range bs.bitmaps {
keys = append(keys, k)
}
bs.mu.RUnlock()
for _, k := range keys {
bs.mu.RLock()
bm := bs.bitmaps[k]
bs.mu.RUnlock()
if bm != nil {
if err := bs.saveBitmap(w, k, bm.bitmap); err != nil {
return err
}
}
}
return nil
}
func (bs *Bitmaps) saveBitmap(w io.Writer, name string, bm *roaring.Bitmap) error {
if bm == nil {
return nil
}
err := binary.Write(w, binary.LittleEndian, uint32(len(name)))
if err != nil {
log.Errorf("failed to write len of name %s: %v", name, err)
return err
}
_, err = w.Write([]byte(name))
if err != nil {
log.Errorf("failed to write name %s: %v", name, err)
return err
}
bs.mu.RLock()
pBitmap := bm.Clone()
bs.mu.RUnlock()
_, err = pBitmap.WriteTo(w)
if err != nil {
log.Errorf("failed to write bitmap %s: %v", name, err)
return err
}
return nil
}
// Read restores bitmaps from a io.Reader.
func (bs *Bitmaps) Read(r io.Reader) error {
for {
name, bm, err := readBitmap(r)
if err == io.EOF {
return nil
}
if err != nil {
return err
}
b := &Bitmap{
bitmap: bm,
}
bs.mu.Lock()
bs.bitmaps[name] = b
bs.mu.Unlock()
}
}
func readBitmap(r io.Reader) (name string, bm *roaring.Bitmap, err error) {
var l uint32
err = binary.Read(r, binary.LittleEndian, &l)
if err != nil {
if err == io.EOF {
return "", nil, err
}
log.Errorf("failed to read len of name: %v", err)
return "", nil, err
}
var data = make([]byte, int(l))
_, err = io.ReadFull(r, data)
if err != nil {
log.Errorf("failed to read name: %v", err)
return "", nil, err
}
name = string(data)
bm = roaring.NewBitmap()
_, err = bm.ReadFrom(r)
if err != nil {
log.Errorf("failed to read name %s: %v", name, err)
return "", nil, err
}
return name, bm, nil
}