6257ddba78
The big change is that the GeoJSON package has been completely rewritten to fix a few of geometry calculation bugs, increase performance, and to better follow the GeoJSON spec RFC 7946. GeoJSON updates - A LineString now requires at least two points. - All json members, even foreign, now persist with the object. - The bbox member persists too but is no longer used for geometry calculations. This is change in behavior. Previously Tile38 would treat the bbox as the object's physical rectangle. - Corrections to geometry intersects and within calculations. Faster spatial queries - The performance of Point-in-polygon and object intersect operations are greatly improved for complex polygons and line strings. It went from O(n) to roughly O(log n). - The same for all collection types with many children, including FeatureCollection, GeometryCollection, MultiPoint, MultiLineString, and MultiPolygon. Codebase changes - The pkg directory has been renamed to internal - The GeoJSON internal package has been moved to a seperate repo at https://github.com/tidwall/geojson. It's now vendored. Please look out for higher memory usage for datasets using complex shapes. A complex shape is one that has 64 or more points. For these shapes it's expected that there will be increase of least 54 bytes per point.
46 lines
948 B
Go
46 lines
948 B
Go
package controller
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import (
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"crypto/md5"
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"crypto/rand"
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"encoding/binary"
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"encoding/hex"
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"io"
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"os"
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"sync/atomic"
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"time"
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)
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func bsonID() string {
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b := make([]byte, 12)
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binary.BigEndian.PutUint32(b, uint32(time.Now().Unix()))
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copy(b[4:], bsonMachine)
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binary.BigEndian.PutUint32(b[8:], atomic.AddUint32(&bsonCounter, 1))
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binary.BigEndian.PutUint16(b[7:], bsonProcess)
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return hex.EncodeToString(b)
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}
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var (
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bsonProcess = uint16(os.Getpid())
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bsonMachine = func() []byte {
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host, err := os.Hostname()
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if err != nil {
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b := make([]byte, 3)
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if _, err := io.ReadFull(rand.Reader, b); err != nil {
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panic("random error: " + err.Error())
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}
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return b
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}
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hw := md5.New()
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hw.Write([]byte(host))
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return hw.Sum(nil)[:3]
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}()
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bsonCounter = func() uint32 {
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b := make([]byte, 4)
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if _, err := io.ReadFull(rand.Reader, b); err != nil {
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panic("random error: " + err.Error())
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}
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return binary.BigEndian.Uint32(b)
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}()
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)
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