mirror of https://github.com/tidwall/tile38.git
430 lines
10 KiB
Go
430 lines
10 KiB
Go
package server
|
|
|
|
import (
|
|
"math"
|
|
"strconv"
|
|
"time"
|
|
|
|
"github.com/tidwall/geojson"
|
|
"github.com/tidwall/geojson/geometry"
|
|
"github.com/tidwall/gjson"
|
|
"github.com/tidwall/tile38/internal/glob"
|
|
)
|
|
|
|
// FenceMatch executes a fence match returns back json messages for fence detection.
|
|
func FenceMatch(hookName string, sw *scanWriter, fence *liveFenceSwitches, metas []FenceMeta, details *commandDetails) []string {
|
|
msgs := fenceMatch(hookName, sw, fence, metas, details)
|
|
if len(fence.accept) == 0 {
|
|
return msgs
|
|
}
|
|
nmsgs := make([]string, 0, len(msgs))
|
|
for _, msg := range msgs {
|
|
if fence.accept[gjson.Get(msg, "command").String()] {
|
|
nmsgs = append(nmsgs, msg)
|
|
}
|
|
}
|
|
return nmsgs
|
|
}
|
|
func appendHookDetails(b []byte, hookName string, metas []FenceMeta) []byte {
|
|
if len(hookName) > 0 {
|
|
b = append(b, `,"hook":`...)
|
|
b = appendJSONString(b, hookName)
|
|
}
|
|
if len(metas) > 0 {
|
|
b = append(b, `,"meta":{`...)
|
|
for i, meta := range metas {
|
|
if i > 0 {
|
|
b = append(b, ',')
|
|
}
|
|
b = appendJSONString(b, meta.Name)
|
|
b = append(b, ':')
|
|
b = appendJSONString(b, meta.Value)
|
|
}
|
|
b = append(b, '}')
|
|
}
|
|
return b
|
|
}
|
|
|
|
func objIsSpatial(obj geojson.Object) bool {
|
|
_, ok := obj.(geojson.Spatial)
|
|
return ok
|
|
}
|
|
|
|
func hookJSONString(hookName string, metas []FenceMeta) string {
|
|
return string(appendHookDetails(nil, hookName, metas))
|
|
}
|
|
func fenceMatch(
|
|
hookName string, sw *scanWriter, fence *liveFenceSwitches,
|
|
metas []FenceMeta, details *commandDetails,
|
|
) []string {
|
|
if details.command == "drop" {
|
|
return []string{
|
|
`{"command":"drop"` + hookJSONString(hookName, metas) +
|
|
`,"time":` + jsonTimeFormat(details.timestamp) + `}`,
|
|
}
|
|
}
|
|
if len(fence.glob) > 0 && !(len(fence.glob) == 1 && fence.glob[0] == '*') {
|
|
match, _ := glob.Match(fence.glob, details.id)
|
|
if !match {
|
|
return nil
|
|
}
|
|
}
|
|
if details.obj == nil || !objIsSpatial(details.obj) {
|
|
return nil
|
|
}
|
|
if details.command == "fset" {
|
|
sw.mu.Lock()
|
|
nofields := sw.nofields
|
|
sw.mu.Unlock()
|
|
if nofields {
|
|
return nil
|
|
}
|
|
}
|
|
if details.command == "del" {
|
|
if fence.roam.on {
|
|
if fence.roam.nearbys != nil {
|
|
delete(fence.roam.nearbys, details.id)
|
|
if len(fence.roam.nearbys) == 0 {
|
|
fence.roam.nearbys = nil
|
|
}
|
|
}
|
|
}
|
|
return []string{
|
|
`{"command":"del"` + hookJSONString(hookName, metas) +
|
|
`,"id":` + jsonString(details.id) +
|
|
`,"time":` + jsonTimeFormat(details.timestamp) + `}`,
|
|
}
|
|
}
|
|
var roamNearbys, roamFaraways []roamMatch
|
|
var detect = "outside"
|
|
if fence != nil {
|
|
if fence.roam.on {
|
|
if details.command == "set" {
|
|
roamNearbys, roamFaraways =
|
|
fenceMatchRoam(sw.c, fence, details.key,
|
|
details.id, details.obj)
|
|
}
|
|
if len(roamNearbys) == 0 && len(roamFaraways) == 0 {
|
|
return nil
|
|
}
|
|
detect = "roam"
|
|
} else {
|
|
// not using roaming
|
|
match1 := fenceMatchObject(fence, details.oldObj)
|
|
match2 := fenceMatchObject(fence, details.obj)
|
|
if match1 && match2 {
|
|
detect = "inside"
|
|
} else if match1 && !match2 {
|
|
detect = "exit"
|
|
} else if !match1 && match2 {
|
|
detect = "enter"
|
|
if details.command == "fset" {
|
|
detect = "inside"
|
|
}
|
|
} else {
|
|
if details.command != "fset" {
|
|
// Maybe the old object and new object create a line that crosses the fence.
|
|
// Must detect for that possibility.
|
|
if details.oldObj != nil {
|
|
ls := geojson.NewLineString(geometry.NewLine(
|
|
[]geometry.Point{
|
|
details.oldObj.Center(),
|
|
details.obj.Center(),
|
|
}, nil))
|
|
temp := false
|
|
if fence.cmd == "within" {
|
|
// because we are testing if the line croses the area we need to use
|
|
// "intersects" instead of "within".
|
|
fence.cmd = "intersects"
|
|
temp = true
|
|
}
|
|
if fenceMatchObject(fence, ls) {
|
|
detect = "cross"
|
|
}
|
|
if temp {
|
|
fence.cmd = "within"
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if details.fmap == nil {
|
|
return nil
|
|
}
|
|
for {
|
|
if fence.detect != nil && !fence.detect[detect] {
|
|
if detect == "enter" {
|
|
detect = "inside"
|
|
continue
|
|
}
|
|
if detect == "exit" {
|
|
detect = "outside"
|
|
continue
|
|
}
|
|
return nil
|
|
}
|
|
break
|
|
}
|
|
sw.mu.Lock()
|
|
var distance float64
|
|
if fence.distance {
|
|
distance = details.obj.Distance(fence.obj)
|
|
}
|
|
sw.fmap = details.fmap
|
|
sw.fullFields = true
|
|
sw.msg.OutputType = JSON
|
|
sw.writeObject(ScanWriterParams{
|
|
id: details.id,
|
|
o: details.obj,
|
|
fields: details.fields,
|
|
noLock: true,
|
|
distance: distance,
|
|
})
|
|
|
|
if sw.wr.Len() == 0 {
|
|
sw.mu.Unlock()
|
|
return nil
|
|
}
|
|
|
|
res := sw.wr.String()
|
|
sw.wr.Reset()
|
|
if len(res) > 0 && res[0] == ',' {
|
|
res = res[1:]
|
|
}
|
|
if sw.output == outputIDs {
|
|
res = `{"id":` + string(res) + `}`
|
|
}
|
|
sw.mu.Unlock()
|
|
|
|
if fence.groups == nil {
|
|
fence.groups = make(map[string]string)
|
|
}
|
|
groupkey := details.key + ":" + details.id
|
|
var group string
|
|
var ok bool
|
|
if detect == "enter" {
|
|
group = bsonID()
|
|
fence.groups[groupkey] = group
|
|
} else if detect == "cross" {
|
|
group = bsonID()
|
|
delete(fence.groups, groupkey)
|
|
} else {
|
|
group, ok = fence.groups[groupkey]
|
|
if !ok {
|
|
group = bsonID()
|
|
fence.groups[groupkey] = group
|
|
}
|
|
}
|
|
var msgs []string
|
|
if fence.detect == nil || fence.detect[detect] {
|
|
if len(res) > 0 && res[0] == '{' {
|
|
msgs = append(msgs, makemsg(details.command, group, detect,
|
|
hookName, metas, details.key, details.timestamp, res[1:]))
|
|
} else {
|
|
msgs = append(msgs, string(res))
|
|
}
|
|
}
|
|
switch detect {
|
|
case "enter":
|
|
if fence.detect == nil || fence.detect["inside"] {
|
|
msgs = append(msgs, makemsg(details.command, group, "inside", hookName, metas, details.key, details.timestamp, res[1:]))
|
|
}
|
|
case "exit", "cross":
|
|
if fence.detect == nil || fence.detect["outside"] {
|
|
msgs = append(msgs, makemsg(details.command, group, "outside", hookName, metas, details.key, details.timestamp, res[1:]))
|
|
}
|
|
case "roam":
|
|
if len(msgs) > 0 {
|
|
var nmsgs []string
|
|
for i := range roamNearbys {
|
|
nmsg := extendRoamMessage(sw, fence,
|
|
"nearby", msgs[0], roamNearbys[i])
|
|
nmsgs = append(nmsgs, string(nmsg))
|
|
}
|
|
for i := range roamFaraways {
|
|
nmsg := extendRoamMessage(sw, fence,
|
|
"faraway", msgs[0], roamFaraways[i])
|
|
nmsgs = append(nmsgs, string(nmsg))
|
|
}
|
|
msgs = nmsgs
|
|
}
|
|
}
|
|
return msgs
|
|
}
|
|
|
|
func extendRoamMessage(
|
|
sw *scanWriter, fence *liveFenceSwitches,
|
|
kind string, baseMsg string, match roamMatch,
|
|
) string {
|
|
// hack off the last '}'
|
|
nmsg := []byte(baseMsg[:len(baseMsg)-1])
|
|
nmsg = append(nmsg, `,"`+kind+`":{"key":`...)
|
|
nmsg = appendJSONString(nmsg, fence.roam.key)
|
|
nmsg = append(nmsg, `,"id":`...)
|
|
nmsg = appendJSONString(nmsg, match.id)
|
|
nmsg = append(nmsg, `,"object":`...)
|
|
nmsg = match.obj.AppendJSON(nmsg)
|
|
nmsg = append(nmsg, `,"meters":`...)
|
|
nmsg = strconv.AppendFloat(nmsg,
|
|
math.Floor(match.meters*1000)/1000, 'f', -1, 64)
|
|
if fence.roam.scan != "" {
|
|
nmsg = append(nmsg, `,"scan":[`...)
|
|
col := sw.c.getCol(fence.roam.key)
|
|
if col != nil {
|
|
obj, _, ok := col.Get(match.id)
|
|
if ok {
|
|
nmsg = append(nmsg, `{"id":`...)
|
|
nmsg = appendJSONString(nmsg, match.id)
|
|
nmsg = append(nmsg, `,"self":true,"object":`...)
|
|
nmsg = obj.AppendJSON(nmsg)
|
|
nmsg = append(nmsg, '}')
|
|
}
|
|
pattern := match.id + fence.roam.scan
|
|
iterator := func(
|
|
oid string, o geojson.Object, fields []float64,
|
|
) bool {
|
|
if oid == match.id {
|
|
return true
|
|
}
|
|
if matched, _ := glob.Match(pattern, oid); matched {
|
|
nmsg = append(nmsg, `,{"id":`...)
|
|
nmsg = appendJSONString(nmsg, oid)
|
|
nmsg = append(nmsg, `,"object":`...)
|
|
nmsg = o.AppendJSON(nmsg)
|
|
nmsg = append(nmsg, '}')
|
|
}
|
|
return true
|
|
}
|
|
g := glob.Parse(pattern, false)
|
|
if g.Limits[0] == "" && g.Limits[1] == "" {
|
|
col.Scan(false, nil, iterator)
|
|
} else {
|
|
col.ScanRange(g.Limits[0], g.Limits[1],
|
|
false, nil, iterator)
|
|
}
|
|
}
|
|
nmsg = append(nmsg, ']')
|
|
}
|
|
|
|
nmsg = append(nmsg, '}')
|
|
|
|
// re-add the last '}'
|
|
nmsg = append(nmsg, '}')
|
|
return string(nmsg)
|
|
}
|
|
|
|
func makemsg(
|
|
command, group, detect, hookName string,
|
|
metas []FenceMeta, key string, t time.Time, tail string,
|
|
) string {
|
|
var buf []byte
|
|
buf = append(append(buf, `{"command":"`...), command...)
|
|
buf = append(append(buf, `","group":"`...), group...)
|
|
buf = append(append(buf, `","detect":"`...), detect...)
|
|
buf = append(buf, '"')
|
|
buf = appendHookDetails(buf, hookName, metas)
|
|
buf = appendJSONString(append(buf, `,"key":`...), key)
|
|
buf = appendJSONTimeFormat(append(buf, `,"time":`...), t)
|
|
buf = append(append(buf, ','), tail...)
|
|
return string(buf)
|
|
}
|
|
|
|
func fenceMatchObject(fence *liveFenceSwitches, obj geojson.Object) bool {
|
|
gobj, _ := obj.(geojson.Object)
|
|
if gobj == nil {
|
|
return false
|
|
}
|
|
if fence.roam.on {
|
|
// we need to check this object against
|
|
return false
|
|
}
|
|
switch fence.cmd {
|
|
case "nearby":
|
|
// nearby is an INTERSECT on a Circle
|
|
return gobj.Intersects(fence.obj)
|
|
case "within":
|
|
return gobj.Within(fence.obj)
|
|
case "intersects":
|
|
return gobj.Intersects(fence.obj)
|
|
}
|
|
return false
|
|
}
|
|
|
|
func fenceMatchRoam(
|
|
c *Server, fence *liveFenceSwitches,
|
|
tkey, tid string, obj geojson.Object,
|
|
) (nearbys, faraways []roamMatch) {
|
|
|
|
col := c.getCol(fence.roam.key)
|
|
if col == nil {
|
|
return
|
|
}
|
|
prevNearbys := fence.roam.nearbys[tid]
|
|
var newNearbys map[string]bool
|
|
|
|
col.Intersects(obj, 0, nil, func(
|
|
id string, obj2 geojson.Object, fields []float64,
|
|
) bool {
|
|
if c.hasExpired(fence.roam.key, id) {
|
|
return true
|
|
}
|
|
var idMatch bool
|
|
if id == tid {
|
|
return true // skip self
|
|
}
|
|
if fence.roam.pattern {
|
|
idMatch, _ = glob.Match(fence.roam.id, id)
|
|
} else {
|
|
idMatch = fence.roam.id == id
|
|
}
|
|
if !idMatch {
|
|
return true
|
|
}
|
|
if newNearbys == nil {
|
|
newNearbys = make(map[string]bool)
|
|
}
|
|
newNearbys[id] = true
|
|
prev := prevNearbys[id]
|
|
if prev {
|
|
delete(prevNearbys, id)
|
|
}
|
|
match := roamMatch{
|
|
id: id,
|
|
obj: obj2,
|
|
meters: obj.Distance(obj2),
|
|
}
|
|
if !prev || !fence.nodwell {
|
|
// brand new "nearby"
|
|
nearbys = append(nearbys, match)
|
|
}
|
|
return true
|
|
})
|
|
for id := range prevNearbys {
|
|
obj2, _, ok := col.Get(id)
|
|
if ok && !c.hasExpired(fence.roam.key, id) {
|
|
faraways = append(faraways, roamMatch{
|
|
id: id,
|
|
obj: obj2,
|
|
meters: obj.Distance(obj2),
|
|
})
|
|
}
|
|
}
|
|
|
|
if len(newNearbys) == 0 {
|
|
if fence.roam.nearbys != nil {
|
|
delete(fence.roam.nearbys, tid)
|
|
if len(fence.roam.nearbys) == 0 {
|
|
fence.roam.nearbys = nil
|
|
}
|
|
}
|
|
} else {
|
|
if fence.roam.nearbys == nil {
|
|
fence.roam.nearbys = make(map[string]map[string]bool)
|
|
}
|
|
fence.roam.nearbys[tid] = newNearbys
|
|
}
|
|
return
|
|
}
|