Merge pull request #652 from tidwall/geofence-where

Allow WHERE for geofence detection

internal/collection/collection.go

@@ -191,8 +191,10 @@ func (c *Collection) Set(
 		oldFieldValues = c.fieldValues.get(oldItem.fieldValuesSlot)
 		newFieldValues = oldFieldValues
 		newItem.fieldValuesSlot = oldItem.fieldValuesSlot
+		if len(oldFieldValues) > 0 {
+			oldFieldValues = append([]float64{}, oldFieldValues...)
+		}
 	}
-
 	if fields == nil {
 		if len(values) > 0 {
 			newFieldValues = values

internal/server/aof.go

@@ -294,6 +294,7 @@ func (s *Server) queueHooks(d *commandDetails) error {
 	for _, hook := range candidates {
 		// Calculate all matching fence messages for all candidates and append
 		// them to the appropriate message slice
+		hook.ScanWriter.loadWheres()
 		msgs := FenceMatch(hook.Name, hook.ScanWriter, hook.Fence, hook.Metas, d)
 		if len(msgs) > 0 {
 			if hook.channel {

internal/server/fence.go

@@ -105,9 +105,18 @@ func fenceMatch(
 			}
 			detect = "roam"
 		} else {
+			var nocross bool
 			// not using roaming
 			match1 := fenceMatchObject(fence, details.oldObj)
+			if match1 {
+				match1, _, _ = sw.testObject(details.id, details.oldObj, details.oldFields)
+				nocross = !match1
+			}
 			match2 := fenceMatchObject(fence, details.obj)
+			if match2 {
+				match2, _, _ = sw.testObject(details.id, details.obj, details.fields)
+				nocross = !match2
+			}
 			if match1 && match2 {
 				detect = "inside"
 			} else if match1 && !match2 {
@@ -121,7 +130,7 @@ func fenceMatch(
 				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 {
+					if !nocross && details.oldObj != nil {
 						ls := geojson.NewLineString(geometry.NewLine(
 							[]geometry.Point{
 								details.oldObj.Center(),
@@ -176,6 +185,7 @@ func fenceMatch(
 		o:          details.obj,
 		fields:     details.fields,
 		noLock:     true,
+		noTest:     true,
 		distance:   distance,
 		distOutput: fence.distance,
 	})

internal/server/scanner.go

@@ -33,6 +33,7 @@ type scanWriter struct {
 	mu             sync.Mutex
 	s              *Server
 	wr             *bytes.Buffer
+	key            string
 	msg            *Message
 	col            *collection.Collection
 	fmap           map[string]int
@@ -58,6 +59,8 @@ type scanWriter struct {
 	values         []resp.Value
 	matchValues    bool
 	respOut        resp.Value
+	orgWheres      []whereT
+	orgWhereins    []whereinT
 }
 
 // ScanWriterParams ...
@@ -68,6 +71,7 @@ type ScanWriterParams struct {
 	distance        float64
 	distOutput      bool // query or fence requested distance output
 	noLock          bool
+	noTest          bool
 	ignoreGlobMatch bool
 	clip            geojson.Object
 	skipTesting     bool
@@ -96,6 +100,7 @@ func (s *Server) newScanWriter(
 	sw := &scanWriter{
 		s:           s,
 		wr:          wr,
+		key:         key,
 		msg:         msg,
 		limit:       limit,
 		cursor:      cursor,
@@ -113,34 +118,48 @@ func (s *Server) newScanWriter(
 			sw.globSingle = true
 		}
 	}
-	sw.col = s.getCol(key)
+	sw.orgWheres = wheres
+	sw.orgWhereins = whereins
+	sw.loadWheres()
+	return sw, nil
+}
+
+func (sw *scanWriter) loadWheres() {
+	sw.fmap = nil
+	sw.farr = nil
+	sw.wheres = nil
+	sw.whereins = nil
+	sw.fvals = nil
+	sw.col = sw.s.getCol(sw.key)
 	if sw.col != nil {
 		sw.fmap = sw.col.FieldMap()
 		sw.farr = sw.col.FieldArr()
 		// This fills index value in wheres/whereins
 		// so we don't have to map string field names for each tested object
 		var ok bool
-		if len(wheres) > 0 {
-			sw.wheres = make([]whereT, len(wheres))
-			for i, where := range wheres {
+		if len(sw.orgWheres) > 0 {
+			sw.wheres = make([]whereT, len(sw.orgWheres))
+			for i, where := range sw.orgWheres {
 				if where.index, ok = sw.fmap[where.field]; !ok {
 					where.index = math.MaxInt32
 				}
 				sw.wheres[i] = where
 			}
 		}
-		if len(whereins) > 0 {
-			sw.whereins = make([]whereinT, len(whereins))
-			for i, wherein := range whereins {
+		if len(sw.orgWhereins) > 0 {
+			sw.whereins = make([]whereinT, len(sw.orgWhereins))
+			for i, wherein := range sw.orgWhereins {
 				if wherein.index, ok = sw.fmap[wherein.field]; !ok {
 					wherein.index = math.MaxInt32
 				}
 				sw.whereins[i] = wherein
 			}
 		}
+		if len(sw.farr) > 0 {
+			sw.fvals = make([]float64, len(sw.farr))
+		}
 	}
-	sw.fvals = make([]float64, len(sw.farr))
-	return sw, nil
+
 }
 
 func (sw *scanWriter) hasFieldsOutput() bool {
@@ -373,9 +392,14 @@ func (sw *scanWriter) writeObject(opts ScanWriterParams) bool {
 		sw.mu.Lock()
 		defer sw.mu.Unlock()
 	}
-	ok, keepGoing, _ := sw.testObject(opts.id, opts.o, opts.fields)
-	if !ok {
-		return keepGoing
+
+	keepGoing := true
+	if !opts.noTest {
+		var ok bool
+		ok, keepGoing, _ = sw.testObject(opts.id, opts.o, opts.fields)
+		if !ok {
+			return keepGoing
+		}
 	}
 	sw.count++
 	if sw.output == outputCount {