forked from absolute8511/ZanRedisDB
/
geo.go
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/
geo.go
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// Derived from the C code implementation of Redis, http://redis.io
// Original copyright states...
package node
import (
"errors"
"fmt"
"sort"
"strconv"
"strings"
"github.com/absolute8511/redcon"
"github.com/youzan/ZanRedisDB/common"
"github.com/youzan/ZanRedisDB/common/geohash"
)
var (
ifGeoHashUnitTest = false
)
type searchType int
const (
RADIUS_COORDS searchType = iota
RADIUS_MEMBER
)
type sortType int
const (
SORT_NONE sortType = iota
SORT_ASC
SORT_DESC
)
/* usage:
GEOADD key lon0 lat0 elem0 lon1 lat1 elem1
*/
func (nd *KVNode) geoaddCommand(cmd redcon.Command) (interface{}, error) {
if len(cmd.Args) < 5 || (len(cmd.Args)-2)%3 != 0 {
err := fmt.Errorf("ERR wrong number arguments for '%v' command", string(cmd.Args[0]))
return nil, err
}
var zaddCmd redcon.Command
zaddCmd.Args = make([][]byte, (len(cmd.Args)-2)/3*2+2)
zaddCmd.Args[0] = []byte("zadd")
zaddCmd.Args[1] = cmd.Args[1]
for i := 0; i < (len(cmd.Args)-2)/3; i++ {
lon, err := strconv.ParseFloat(string(cmd.Args[i*3+2]), 64)
if err != nil {
return nil, errors.New("ERR value is not a valid float")
}
lat, err := strconv.ParseFloat(string(cmd.Args[i*3+3]), 64)
if err != nil {
return nil, errors.New("ERR value is not a valid float")
}
hash, err := geohash.EncodeWGS84(lon, lat)
if err != nil {
return nil, errors.New("Err " + err.Error())
}
zaddCmd.Args[i*2+2] = strconv.AppendUint(zaddCmd.Args[i*2+2], hash, 10)
zaddCmd.Args[i*2+3] = cmd.Args[i*3+4]
}
if ifGeoHashUnitTest {
/* The code used for unit test. */
key, err := common.CutNamesapce(cmd.Args[1])
if err != nil {
return nil, err
}
zaddCmd.Args[1] = key
sm, ok := nd.sm.(*kvStoreSM)
if !ok {
return nil, errors.New("Err not supported state machine")
}
if _, err := sm.localZaddCommand(buildCommand(zaddCmd.Args), -1); err != nil {
return nil, errors.New("Err " + err.Error())
}
} else {
/* The code actually execute. */
return nd.zaddCommand(buildCommand(zaddCmd.Args))
}
return 0, nil
}
/* usage:
GEODIST key elem0 elem1 [unit]
*/
func (nd *KVNode) geodistCommand(conn redcon.Conn, cmd redcon.Command) {
if len(cmd.Args) != 4 && len(cmd.Args) != 5 {
conn.WriteError("ERR wrong number of arguments for 'geodist' command")
return
}
var toMeters float64 = 1.0
var err error
if len(cmd.Args) == 5 {
toMeters, err = extractUnit(cmd.Args[4])
if err != nil {
conn.WriteError(err.Error())
return
}
}
hash0, err := nd.store.ZScore(cmd.Args[1], cmd.Args[2])
if err != nil {
conn.WriteNull()
return
}
hash1, err := nd.store.ZScore(cmd.Args[1], cmd.Args[3])
if err != nil {
conn.WriteNull()
return
}
distance := geohash.DistBetweenGeoHashWGS84(uint64(hash0), uint64(hash1)) / toMeters
conn.WriteBulk([]byte(strconv.FormatFloat(distance, 'g', -1, 64)))
}
/* usage:
GEOHASH key elem0 elem1 ... elemN
*/
func (nd *KVNode) geohashCommand(conn redcon.Conn, cmd redcon.Command) {
conn.WriteArray(len(cmd.Args) - 2)
for _, member := range cmd.Args[2:] {
hash, err := nd.store.ZScore(cmd.Args[1], member)
if err != nil {
//conn.WriteString(err.Error())
conn.WriteNull()
} else {
/* The internal format we use for geocoding is a bit different
* than the standard, since we use as initial latitude range
* -85,85, while the normal geohashing algorithm uses -90,90.
* So we have to decode our position and re-encode using the
* standard ranges in order to output a valid geohash string. */
/* Decode... */
longitude, latitude := geohash.DecodeToLongLatWGS84(uint64(hash))
code, _ := geohash.Encode(
&geohash.Range{Max: 180, Min: -180},
&geohash.Range{Max: 90, Min: -90},
longitude,
latitude,
geohash.WGS84_GEO_STEP)
conn.WriteBulk(geohash.EncodeToBase32(code.Bits))
}
}
}
/* usage:
GEOPOS key elem0 elem1 ... elemN
*/
func (nd *KVNode) geoposCommand(conn redcon.Conn, cmd redcon.Command) {
conn.WriteArray(len(cmd.Args) - 2)
for _, member := range cmd.Args[2:] {
hash, err := nd.store.ZScore(cmd.Args[1], member)
if err != nil {
conn.WriteNull()
} else {
longitude, latitude := geohash.DecodeToLongLatWGS84(uint64(hash))
conn.WriteArray(2)
conn.WriteBulk([]byte(strconv.FormatFloat(longitude, 'g', -1, 64)))
conn.WriteBulk([]byte(strconv.FormatFloat(latitude, 'g', -1, 64)))
}
}
}
/* usage:
GEORADIUS key longitude latitude radius m|km|ft|mi [WITHCOORD] [WITHDIST]
[WITHHASH] [COUNT count] [ASC|DESC] [STORE key] [STOREDIST key]
*/
func (nd *KVNode) geoRadiusCommand(conn redcon.Conn, cmd redcon.Command) {
nd.geoRadiusGeneric(conn, cmd, RADIUS_COORDS)
}
/* usage:
GEORADIUSBYMEMBER key member radius m|km|ft|mi [WITHCOORD] [WITHDIST]
[WITHHASH] [COUNT count] [ASC|DESC] [STORE key] [STOREDIST key]
*/
func (nd *KVNode) geoRadiusByMemberCommand(conn redcon.Conn, cmd redcon.Command) {
nd.geoRadiusGeneric(conn, cmd, RADIUS_MEMBER)
}
func (nd *KVNode) geoRadiusGeneric(conn redcon.Conn, cmd redcon.Command, stype searchType) {
var x, y float64
var err error
if card, err := nd.store.ZCard(cmd.Args[1]); err != nil || card == 0 {
if err != nil {
conn.WriteError(err.Error())
} else {
conn.WriteArray(0)
}
return
}
var baseArgs = 0
switch stype {
case RADIUS_COORDS:
baseArgs = 4
if x, err = strconv.ParseFloat(string(cmd.Args[2]), 64); err != nil {
conn.WriteError("Err value is not a valid float")
return
}
if y, err = strconv.ParseFloat(string(cmd.Args[3]), 64); err != nil {
conn.WriteError("Err value is not a valid float")
return
}
case RADIUS_MEMBER:
baseArgs = 3
hash, err := nd.store.ZScore(cmd.Args[1], cmd.Args[2])
if err != nil {
conn.WriteError(err.Error())
return
}
x, y = geohash.DecodeToLongLatWGS84(uint64(hash))
default:
conn.WriteError("unknown georadius search type")
return
}
radiusMeters, conversion, err := extractDistance(cmd.Args[baseArgs], cmd.Args[baseArgs+1])
if err != nil {
conn.WriteError(err.Error())
return
}
var withdist, withhash, withcoords bool
var sortT sortType
var optLen, count int
/* Parse the radius search opts.*/
opts := cmd.Args[baseArgs+2:]
for i := 0; i < len(opts); i++ {
option := strings.ToLower(string(opts[i]))
switch option {
case "withdist":
withdist = true
optLen++
case "withcoord":
withcoords = true
optLen++
case "withhash":
withhash = true
optLen++
case "asc":
sortT = SORT_ASC
case "desc":
sortT = SORT_DESC
case "count":
if i+1 >= len(opts) {
err = errors.New("ERR syntax error")
} else {
count, err = strconv.Atoi(string(opts[i+1]))
if err != nil {
err = errors.New("ERR value is not an integer or out of range")
} else if count < 0 {
err = errors.New("ERR COUNT must > 0")
} else {
i++
}
}
default:
err = errors.New("ERR syntax error")
}
if err != nil {
conn.WriteError(err.Error())
return
}
}
/* COUNT without ordering does not make much sense, force ASC
* ordering if COUNT was specified but no sorting was requested. */
if count != 0 && sortT == SORT_NONE {
sortT = SORT_ASC
}
radiusArea, err := geohash.GetAreasByRadiusWGS84(x, y, radiusMeters)
if err != nil {
conn.WriteError(err.Error())
return
}
plist, err := nd.geoMembersOfAllNeighbors(cmd.Args[1], radiusArea, x, y, radiusMeters)
if err != nil {
conn.WriteError(err.Error())
return
}
if count == 0 || len(plist) < count {
count = len(plist)
}
/* Sort the returned geoPoints. */
switch sortT {
case SORT_ASC:
slice := geoPointsSlice(plist)
sort.Sort(slice)
case SORT_DESC:
slice := geoPointsSlice(plist)
sort.Sort(sort.Reverse(slice))
default:
}
/* Return results to user. */
conn.WriteArray(count)
for _, point := range plist[:count] {
if optLen > 0 {
conn.WriteArray(optLen + 1)
}
conn.WriteBulk(point.member)
if withdist {
dist := point.dist / conversion
conn.WriteBulk([]byte(strconv.FormatFloat(dist, 'g', -1, 64)))
}
if withhash {
conn.WriteInt64(int64(point.score))
}
if withcoords {
conn.WriteArray(2)
conn.WriteBulk([]byte(strconv.FormatFloat(point.longitude, 'g', -1, 64)))
conn.WriteBulk([]byte(strconv.FormatFloat(point.latitude, 'g', -1, 64)))
}
}
}
func extractUnit(unit []byte) (float64, error) {
switch string(unit) {
case "m":
return 1, nil
case "km":
return 1000, nil
case "ft":
return 0.3048, nil
case "mi":
return 1609.34, nil
default:
return -1, errors.New("Unsupported unit provided. please use m, km, ft, mi")
}
}
func extractDistance(radius []byte, unit []byte) (float64, float64, error) {
distance, err := strconv.ParseFloat(string(radius), 64)
if err != nil {
return -1, -1, errors.New("need numeric radius")
} else if distance < 0 {
return -1, -1, errors.New("radius cannot be negative")
}
toMeters, err := extractUnit(unit)
if err != nil {
return -1, -1, err
}
return distance * toMeters, toMeters, nil
}
func (nd *KVNode) geoMembersOfAllNeighbors(set []byte, geoRadius *geohash.Radius, lon, lat, radius float64) ([]*geoPoints, error) {
neighbors := [9]*geohash.HashBits{
&geoRadius.Hash,
&geoRadius.North,
&geoRadius.South,
&geoRadius.East,
&geoRadius.West,
&geoRadius.NorthEast,
&geoRadius.NorthWest,
&geoRadius.SouthEast,
&geoRadius.SouthWest,
}
var lastProcessed int = 0
plist := make([]*geoPoints, 0, 64)
for i, area := range neighbors {
if area.IsZero() {
continue
}
// When a huge Radius (in the 5000 km range or more) is used,
// adjacent neighbors can be the same, leading to duplicated
// elements. Skip every range which is the same as the one
// processed previously.
if lastProcessed != 0 &&
area.Bits == neighbors[lastProcessed].Bits &&
area.Step == neighbors[lastProcessed].Step {
continue
}
ps, err := nd.membersOfGeoHashBox(set, lon, lat, radius, area)
if err != nil {
return nil, err
} else {
plist = append(plist, ps...)
}
lastProcessed = i
}
return plist, nil
}
type geoPoints struct {
longitude float64
latitude float64
dist float64
score float64
member []byte
}
// Obtain all members between the min/max of this geohash bounding box.
func (nd *KVNode) membersOfGeoHashBox(zset []byte, longitude, latitude, radius float64, hash *geohash.HashBits) ([]*geoPoints, error) {
points := make([]*geoPoints, 0, 32)
min, max := scoresOfGeoHashBox(hash)
vlist, err := nd.store.ZRangeByScoreGeneric(zset, float64(min), float64(max), 0, -1, false)
if err != nil {
return nil, err
}
for _, v := range vlist {
x, y := geohash.DecodeToLongLatWGS84(uint64(v.Score))
dist := geohash.GetDistance(x, y, longitude, latitude)
if radius >= dist {
p := &geoPoints{
longitude: x,
latitude: y,
dist: dist,
score: v.Score,
member: v.Member,
}
points = append(points, p)
}
}
return points, nil
}
/* Compute the sorted set scores min (inclusive), max (exclusive) we should
* query in order to retrieve all the elements inside the specified area
* 'hash'. The two scores are returned by reference in *min and *max. */
func scoresOfGeoHashBox(hash *geohash.HashBits) (min, max uint64) {
min = hash.Bits << (geohash.WGS84_GEO_STEP*2 - hash.Step*2)
bits := hash.Bits + 1
max = bits << (geohash.WGS84_GEO_STEP*2 - hash.Step*2)
return
}
type geoPointsSlice []*geoPoints
func (slice geoPointsSlice) Less(i, j int) bool {
return slice[i].dist < slice[j].dist
}
func (slice geoPointsSlice) Len() int {
return len(slice)
}
func (slice geoPointsSlice) Swap(i, j int) {
slice[i], slice[j] = slice[j], slice[i]
}