mirror of https://github.com/tidwall/tile38.git
647 lines
14 KiB
Go
647 lines
14 KiB
Go
package collection
|
|
|
|
import (
|
|
"runtime"
|
|
|
|
"github.com/tidwall/btree"
|
|
"github.com/tidwall/geojson"
|
|
"github.com/tidwall/geojson/geometry"
|
|
"github.com/tidwall/rtree"
|
|
"github.com/tidwall/tile38/internal/deadline"
|
|
"github.com/tidwall/tile38/internal/field"
|
|
"github.com/tidwall/tile38/internal/object"
|
|
)
|
|
|
|
// yieldStep forces the iterator to yield goroutine every 256 steps.
|
|
const yieldStep = 256
|
|
|
|
// Cursor allows for quickly paging through Scan, Within, Intersects, and Nearby
|
|
type Cursor interface {
|
|
Offset() uint64
|
|
Step(count uint64)
|
|
}
|
|
|
|
func byID(a, b *object.Object) bool {
|
|
return a.ID() < b.ID()
|
|
}
|
|
|
|
func byValue(a, b *object.Object) bool {
|
|
value1 := a.String()
|
|
value2 := b.String()
|
|
if value1 < value2 {
|
|
return true
|
|
}
|
|
if value1 > value2 {
|
|
return false
|
|
}
|
|
// the values match so we'll compare IDs, which are always unique.
|
|
return byID(a, b)
|
|
}
|
|
|
|
func byExpires(a, b *object.Object) bool {
|
|
if a.Expires() < b.Expires() {
|
|
return true
|
|
}
|
|
if a.Expires() > b.Expires() {
|
|
return false
|
|
}
|
|
// the values match so we'll compare IDs, which are always unique.
|
|
return byID(a, b)
|
|
}
|
|
|
|
// Collection represents a collection of geojson objects.
|
|
type Collection struct {
|
|
objs btree.Map[string, *object.Object] // sorted by id
|
|
spatial rtree.RTreeGN[float32, *object.Object] // geospatially indexed
|
|
values *btree.BTreeG[*object.Object] // sorted by value+id
|
|
expires *btree.BTreeG[*object.Object] // sorted by ex+id
|
|
weight int
|
|
points int
|
|
objects int // geometry count
|
|
nobjects int // non-geometry count
|
|
}
|
|
|
|
var optsNoLock = btree.Options{NoLocks: true}
|
|
|
|
// New creates an empty collection
|
|
func New() *Collection {
|
|
col := &Collection{
|
|
values: btree.NewBTreeGOptions(byValue, optsNoLock),
|
|
expires: btree.NewBTreeGOptions(byExpires, optsNoLock),
|
|
}
|
|
return col
|
|
}
|
|
|
|
// Count returns the number of objects in collection.
|
|
func (c *Collection) Count() int {
|
|
return c.objects + c.nobjects
|
|
}
|
|
|
|
// StringCount returns the number of string values.
|
|
func (c *Collection) StringCount() int {
|
|
return c.nobjects
|
|
}
|
|
|
|
// PointCount returns the number of points (lat/lon coordinates) in collection.
|
|
func (c *Collection) PointCount() int {
|
|
return c.points
|
|
}
|
|
|
|
// TotalWeight calculates the in-memory cost of the collection in bytes.
|
|
func (c *Collection) TotalWeight() int {
|
|
return c.weight
|
|
}
|
|
|
|
// Bounds returns the bounds of all the items in the collection.
|
|
func (c *Collection) Bounds() (minX, minY, maxX, maxY float64) {
|
|
_, _, left := c.spatial.LeftMost()
|
|
_, _, bottom := c.spatial.BottomMost()
|
|
_, _, right := c.spatial.RightMost()
|
|
_, _, top := c.spatial.TopMost()
|
|
if left == nil {
|
|
return
|
|
}
|
|
return left.Rect().Min.X, bottom.Rect().Min.Y,
|
|
right.Rect().Max.X, top.Rect().Max.Y
|
|
}
|
|
|
|
func (c *Collection) indexDelete(item *object.Object) {
|
|
if !item.Geo().Empty() {
|
|
c.spatial.Delete(rtreeItem(item))
|
|
}
|
|
}
|
|
|
|
func (c *Collection) indexInsert(item *object.Object) {
|
|
if !item.Geo().Empty() {
|
|
c.spatial.Insert(rtreeItem(item))
|
|
}
|
|
}
|
|
|
|
const dRNDTOWARDS = (1.0 - 1.0/8388608.0) /* Round towards zero */
|
|
const dRNDAWAY = (1.0 + 1.0/8388608.0) /* Round away from zero */
|
|
|
|
func rtreeValueDown(d float64) float32 {
|
|
f := float32(d)
|
|
if float64(f) > d {
|
|
if d < 0 {
|
|
f = float32(d * dRNDAWAY)
|
|
} else {
|
|
f = float32(d * dRNDTOWARDS)
|
|
}
|
|
}
|
|
return f
|
|
}
|
|
func rtreeValueUp(d float64) float32 {
|
|
f := float32(d)
|
|
if float64(f) < d {
|
|
if d < 0 {
|
|
f = float32(d * dRNDTOWARDS)
|
|
} else {
|
|
f = float32(d * dRNDAWAY)
|
|
}
|
|
}
|
|
return f
|
|
}
|
|
|
|
func rtreeItem(item *object.Object) (min, max [2]float32, data *object.Object) {
|
|
min, max = rtreeRect(item.Rect())
|
|
return min, max, item
|
|
}
|
|
|
|
func rtreeRect(rect geometry.Rect) (min, max [2]float32) {
|
|
return [2]float32{
|
|
rtreeValueDown(rect.Min.X),
|
|
rtreeValueDown(rect.Min.Y),
|
|
}, [2]float32{
|
|
rtreeValueUp(rect.Max.X),
|
|
rtreeValueUp(rect.Max.Y),
|
|
}
|
|
}
|
|
|
|
// Set adds or replaces an object in the collection and returns the fields
|
|
// array.
|
|
func (c *Collection) Set(obj *object.Object) (prev *object.Object) {
|
|
prev, _ = c.objs.Set(obj.ID(), obj)
|
|
c.setFill(prev, obj)
|
|
return prev
|
|
}
|
|
|
|
// SetMerged works just like Set but it will merge the new object fields and
|
|
// the previous object fields and create a newer object that is then set into
|
|
// the collection. The newer object is returned.
|
|
func (c *Collection) SetMerged(obj *object.Object,
|
|
) (prev, newObj *object.Object) {
|
|
prev, _ = c.objs.Set(obj.ID(), obj)
|
|
if prev != nil {
|
|
// Check if at least one field exists from the previous object and
|
|
// merge the two field lists, then re-set the new object. Otherwise,
|
|
// we stick with the current object.
|
|
// TODO: check if the old object has fields that new object does not
|
|
// and only reset those.
|
|
ofields := prev.Fields()
|
|
var reset bool
|
|
ofields.Scan(func(f field.Field) bool {
|
|
reset = true
|
|
return false
|
|
})
|
|
if reset {
|
|
obj.Fields().Scan(func(f field.Field) bool {
|
|
ofields = ofields.Set(f)
|
|
return true
|
|
})
|
|
obj = object.New(obj.ID(), obj.Geo(), obj.Expires(), ofields)
|
|
c.objs.Set(obj.ID(), obj)
|
|
}
|
|
}
|
|
c.setFill(prev, obj)
|
|
return prev, obj
|
|
}
|
|
|
|
func (c *Collection) setFill(prev, obj *object.Object) {
|
|
if prev != nil {
|
|
if prev.IsSpatial() {
|
|
c.indexDelete(prev)
|
|
c.objects--
|
|
} else {
|
|
c.values.Delete(prev)
|
|
c.nobjects--
|
|
}
|
|
if prev.Expires() != 0 {
|
|
c.expires.Delete(prev)
|
|
}
|
|
c.points -= prev.Geo().NumPoints()
|
|
c.weight -= prev.Weight()
|
|
}
|
|
if obj.IsSpatial() {
|
|
c.indexInsert(obj)
|
|
c.objects++
|
|
} else {
|
|
c.values.Set(obj)
|
|
c.nobjects++
|
|
}
|
|
if obj.Expires() != 0 {
|
|
c.expires.Set(obj)
|
|
}
|
|
c.points += obj.Geo().NumPoints()
|
|
c.weight += obj.Weight()
|
|
}
|
|
|
|
// Delete removes an object and returns it.
|
|
// If the object does not exist then the 'ok' return value will be false.
|
|
func (c *Collection) Delete(id string) (prev *object.Object) {
|
|
prev, _ = c.objs.Delete(id)
|
|
if prev == nil {
|
|
return nil
|
|
}
|
|
if prev.IsSpatial() {
|
|
if !prev.Geo().Empty() {
|
|
c.indexDelete(prev)
|
|
}
|
|
c.objects--
|
|
} else {
|
|
c.values.Delete(prev)
|
|
c.nobjects--
|
|
}
|
|
if prev.Expires() != 0 {
|
|
c.expires.Delete(prev)
|
|
}
|
|
c.points -= prev.Geo().NumPoints()
|
|
c.weight -= prev.Weight()
|
|
return prev
|
|
}
|
|
|
|
// Get returns an object.
|
|
// If the object does not exist then the 'ok' return value will be false.
|
|
func (c *Collection) Get(id string) *object.Object {
|
|
obj, _ := c.objs.Get(id)
|
|
return obj
|
|
}
|
|
|
|
// Scan iterates though the collection ids.
|
|
func (c *Collection) Scan(
|
|
desc bool,
|
|
cursor Cursor,
|
|
deadline *deadline.Deadline,
|
|
iterator func(obj *object.Object) bool,
|
|
) bool {
|
|
var keepon = true
|
|
var count uint64
|
|
var offset uint64
|
|
if cursor != nil {
|
|
offset = cursor.Offset()
|
|
cursor.Step(offset)
|
|
}
|
|
iter := func(_ string, obj *object.Object) bool {
|
|
count++
|
|
if count <= offset {
|
|
return true
|
|
}
|
|
nextStep(count, cursor, deadline)
|
|
keepon = iterator(obj)
|
|
return keepon
|
|
}
|
|
if desc {
|
|
c.objs.Reverse(iter)
|
|
} else {
|
|
c.objs.Scan(iter)
|
|
}
|
|
return keepon
|
|
}
|
|
|
|
// ScanRange iterates though the collection starting with specified id.
|
|
func (c *Collection) ScanRange(
|
|
start, end string,
|
|
desc bool,
|
|
cursor Cursor,
|
|
deadline *deadline.Deadline,
|
|
iterator func(o *object.Object) bool,
|
|
) bool {
|
|
var keepon = true
|
|
var count uint64
|
|
var offset uint64
|
|
if cursor != nil {
|
|
offset = cursor.Offset()
|
|
cursor.Step(offset)
|
|
}
|
|
iter := func(_ string, o *object.Object) bool {
|
|
count++
|
|
if count <= offset {
|
|
return true
|
|
}
|
|
nextStep(count, cursor, deadline)
|
|
if !desc {
|
|
if o.ID() >= end {
|
|
return false
|
|
}
|
|
} else {
|
|
if o.ID() <= end {
|
|
return false
|
|
}
|
|
}
|
|
keepon = iterator(o)
|
|
return keepon
|
|
}
|
|
|
|
if desc {
|
|
c.objs.Descend(start, iter)
|
|
} else {
|
|
c.objs.Ascend(start, iter)
|
|
}
|
|
return keepon
|
|
}
|
|
|
|
// SearchValues iterates though the collection values.
|
|
func (c *Collection) SearchValues(
|
|
desc bool,
|
|
cursor Cursor,
|
|
deadline *deadline.Deadline,
|
|
iterator func(o *object.Object) bool,
|
|
) bool {
|
|
var keepon = true
|
|
var count uint64
|
|
var offset uint64
|
|
if cursor != nil {
|
|
offset = cursor.Offset()
|
|
cursor.Step(offset)
|
|
}
|
|
iter := func(o *object.Object) bool {
|
|
count++
|
|
if count <= offset {
|
|
return true
|
|
}
|
|
nextStep(count, cursor, deadline)
|
|
keepon = iterator(o)
|
|
return keepon
|
|
}
|
|
if desc {
|
|
c.values.Reverse(iter)
|
|
} else {
|
|
c.values.Scan(iter)
|
|
}
|
|
return keepon
|
|
}
|
|
|
|
// SearchValuesRange iterates though the collection values.
|
|
func (c *Collection) SearchValuesRange(start, end string, desc bool,
|
|
cursor Cursor,
|
|
deadline *deadline.Deadline,
|
|
iterator func(o *object.Object) bool,
|
|
) bool {
|
|
var keepon = true
|
|
var count uint64
|
|
var offset uint64
|
|
if cursor != nil {
|
|
offset = cursor.Offset()
|
|
cursor.Step(offset)
|
|
}
|
|
iter := func(o *object.Object) bool {
|
|
count++
|
|
if count <= offset {
|
|
return true
|
|
}
|
|
nextStep(count, cursor, deadline)
|
|
keepon = iterator(o)
|
|
return keepon
|
|
}
|
|
|
|
pstart := object.New("", String(start), 0, field.List{})
|
|
pend := object.New("", String(end), 0, field.List{})
|
|
if desc {
|
|
// descend range
|
|
c.values.Descend(pstart, func(item *object.Object) bool {
|
|
return bGT(c.values, item, pend) && iter(item)
|
|
})
|
|
} else {
|
|
c.values.Ascend(pstart, func(item *object.Object) bool {
|
|
return bLT(c.values, item, pend) && iter(item)
|
|
})
|
|
}
|
|
return keepon
|
|
}
|
|
|
|
func bLT(tr *btree.BTreeG[*object.Object], a, b *object.Object) bool { return tr.Less(a, b) }
|
|
func bGT(tr *btree.BTreeG[*object.Object], a, b *object.Object) bool { return tr.Less(b, a) }
|
|
|
|
// ScanGreaterOrEqual iterates though the collection starting with specified id.
|
|
func (c *Collection) ScanGreaterOrEqual(id string, desc bool,
|
|
cursor Cursor,
|
|
deadline *deadline.Deadline,
|
|
iterator func(o *object.Object) bool,
|
|
) bool {
|
|
var keepon = true
|
|
var count uint64
|
|
var offset uint64
|
|
if cursor != nil {
|
|
offset = cursor.Offset()
|
|
cursor.Step(offset)
|
|
}
|
|
iter := func(_ string, o *object.Object) bool {
|
|
count++
|
|
if count <= offset {
|
|
return true
|
|
}
|
|
nextStep(count, cursor, deadline)
|
|
keepon = iterator(o)
|
|
return keepon
|
|
}
|
|
if desc {
|
|
c.objs.Descend(id, iter)
|
|
} else {
|
|
c.objs.Ascend(id, iter)
|
|
}
|
|
return keepon
|
|
}
|
|
|
|
func (c *Collection) geoSearch(
|
|
rect geometry.Rect,
|
|
iter func(o *object.Object) bool,
|
|
) bool {
|
|
alive := true
|
|
min, max := rtreeRect(rect)
|
|
c.spatial.Search(
|
|
min, max,
|
|
func(_, _ [2]float32, o *object.Object) bool {
|
|
alive = iter(o)
|
|
return alive
|
|
},
|
|
)
|
|
return alive
|
|
}
|
|
|
|
func (c *Collection) geoSparse(
|
|
obj geojson.Object, sparse uint8,
|
|
iter func(o *object.Object) (match, ok bool),
|
|
) bool {
|
|
matches := make(map[string]bool)
|
|
alive := true
|
|
c.geoSparseInner(obj.Rect(), sparse, func(o *object.Object) (match, ok bool) {
|
|
ok = true
|
|
if !matches[o.ID()] {
|
|
match, ok = iter(o)
|
|
if match {
|
|
matches[o.ID()] = true
|
|
}
|
|
}
|
|
return match, ok
|
|
})
|
|
return alive
|
|
}
|
|
func (c *Collection) geoSparseInner(
|
|
rect geometry.Rect, sparse uint8,
|
|
iter func(o *object.Object) (match, ok bool),
|
|
) bool {
|
|
if sparse > 0 {
|
|
w := rect.Max.X - rect.Min.X
|
|
h := rect.Max.Y - rect.Min.Y
|
|
quads := [4]geometry.Rect{
|
|
{
|
|
Min: geometry.Point{X: rect.Min.X, Y: rect.Min.Y + h/2},
|
|
Max: geometry.Point{X: rect.Min.X + w/2, Y: rect.Max.Y},
|
|
},
|
|
{
|
|
Min: geometry.Point{X: rect.Min.X + w/2, Y: rect.Min.Y + h/2},
|
|
Max: geometry.Point{X: rect.Max.X, Y: rect.Max.Y},
|
|
},
|
|
{
|
|
Min: geometry.Point{X: rect.Min.X, Y: rect.Min.Y},
|
|
Max: geometry.Point{X: rect.Min.X + w/2, Y: rect.Min.Y + h/2},
|
|
},
|
|
{
|
|
Min: geometry.Point{X: rect.Min.X + w/2, Y: rect.Min.Y},
|
|
Max: geometry.Point{X: rect.Max.X, Y: rect.Min.Y + h/2},
|
|
},
|
|
}
|
|
for _, quad := range quads {
|
|
if !c.geoSparseInner(quad, sparse-1, iter) {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
alive := true
|
|
c.geoSearch(rect, func(o *object.Object) bool {
|
|
match, ok := iter(o)
|
|
if !ok {
|
|
alive = false
|
|
return false
|
|
}
|
|
return !match
|
|
})
|
|
return alive
|
|
}
|
|
|
|
// Within returns all object that are fully contained within an object or
|
|
// bounding box. Set obj to nil in order to use the bounding box.
|
|
func (c *Collection) Within(
|
|
obj geojson.Object,
|
|
sparse uint8,
|
|
cursor Cursor,
|
|
deadline *deadline.Deadline,
|
|
iter func(o *object.Object) bool,
|
|
) bool {
|
|
var count uint64
|
|
var offset uint64
|
|
if cursor != nil {
|
|
offset = cursor.Offset()
|
|
cursor.Step(offset)
|
|
}
|
|
if sparse > 0 {
|
|
return c.geoSparse(obj, sparse, func(o *object.Object) (match, ok bool) {
|
|
count++
|
|
if count <= offset {
|
|
return false, true
|
|
}
|
|
nextStep(count, cursor, deadline)
|
|
if match = o.Geo().Within(obj); match {
|
|
ok = iter(o)
|
|
}
|
|
return match, ok
|
|
})
|
|
}
|
|
return c.geoSearch(obj.Rect(), func(o *object.Object) bool {
|
|
count++
|
|
if count <= offset {
|
|
return true
|
|
}
|
|
nextStep(count, cursor, deadline)
|
|
if o.Geo().Within(obj) {
|
|
return iter(o)
|
|
}
|
|
return true
|
|
})
|
|
}
|
|
|
|
// Intersects returns all object that are intersect an object or bounding box.
|
|
// Set obj to nil in order to use the bounding box.
|
|
func (c *Collection) Intersects(
|
|
gobj geojson.Object,
|
|
sparse uint8,
|
|
cursor Cursor,
|
|
deadline *deadline.Deadline,
|
|
iter func(o *object.Object) bool,
|
|
) bool {
|
|
var count uint64
|
|
var offset uint64
|
|
if cursor != nil {
|
|
offset = cursor.Offset()
|
|
cursor.Step(offset)
|
|
}
|
|
if sparse > 0 {
|
|
return c.geoSparse(gobj, sparse, func(o *object.Object) (match, ok bool) {
|
|
count++
|
|
if count <= offset {
|
|
return false, true
|
|
}
|
|
nextStep(count, cursor, deadline)
|
|
if match = o.Geo().Intersects(gobj); match {
|
|
ok = iter(o)
|
|
}
|
|
return match, ok
|
|
})
|
|
}
|
|
return c.geoSearch(gobj.Rect(), func(o *object.Object) bool {
|
|
count++
|
|
if count <= offset {
|
|
return true
|
|
}
|
|
nextStep(count, cursor, deadline)
|
|
if o.Geo().Intersects(gobj) {
|
|
return iter(o)
|
|
}
|
|
return true
|
|
},
|
|
)
|
|
}
|
|
|
|
// Nearby returns the nearest neighbors
|
|
func (c *Collection) Nearby(
|
|
target geojson.Object,
|
|
cursor Cursor,
|
|
deadline *deadline.Deadline,
|
|
iter func(o *object.Object, dist float64) bool,
|
|
) bool {
|
|
alive := true
|
|
center := target.Center()
|
|
var count uint64
|
|
var offset uint64
|
|
if cursor != nil {
|
|
offset = cursor.Offset()
|
|
cursor.Step(offset)
|
|
}
|
|
distFn := geodeticDistAlgo([2]float64{center.X, center.Y})
|
|
c.spatial.Nearby(
|
|
func(min, max [2]float32, data *object.Object, item bool) float64 {
|
|
return distFn(
|
|
[2]float64{float64(min[0]), float64(min[1])},
|
|
[2]float64{float64(max[0]), float64(max[1])},
|
|
data, item,
|
|
)
|
|
},
|
|
func(_, _ [2]float32, o *object.Object, dist float64) bool {
|
|
count++
|
|
if count <= offset {
|
|
return true
|
|
}
|
|
nextStep(count, cursor, deadline)
|
|
alive = iter(o, dist)
|
|
return alive
|
|
},
|
|
)
|
|
return alive
|
|
}
|
|
|
|
func nextStep(step uint64, cursor Cursor, deadline *deadline.Deadline) {
|
|
if step&(yieldStep-1) == (yieldStep - 1) {
|
|
runtime.Gosched()
|
|
deadline.Check()
|
|
}
|
|
if cursor != nil {
|
|
cursor.Step(1)
|
|
}
|
|
}
|
|
|
|
// ScanExpires returns a list of all objects that have expired.
|
|
func (c *Collection) ScanExpires(iter func(o *object.Object) bool) {
|
|
c.expires.Scan(iter)
|
|
}
|