wip: MVT output

go.mod

@@ -85,6 +85,7 @@ require (
 	github.com/tidwall/cities v0.1.0 // indirect
 	github.com/tidwall/grect v0.1.4 // indirect
 	github.com/tidwall/lotsa v1.0.2 // indirect
+	github.com/tidwall/mvt v0.1.2 // indirect
 	github.com/tidwall/rtred v0.1.2 // indirect
 	github.com/tidwall/tinyqueue v0.1.1 // indirect
 	github.com/xdg/stringprep v1.0.3 // indirect

go.sum

@@ -348,6 +348,8 @@ github.com/tidwall/lotsa v1.0.2 h1:dNVBH5MErdaQ/xd9s769R31/n2dXavsQ0Yf4TMEHHw8=
 github.com/tidwall/lotsa v1.0.2/go.mod h1:X6NiU+4yHA3fE3Puvpnn1XMDrFZrE9JO2/w+UMuqgR8=
 github.com/tidwall/match v1.1.1 h1:+Ho715JplO36QYgwN9PGYNhgZvoUSc9X2c80KVTi+GA=
 github.com/tidwall/match v1.1.1/go.mod h1:eRSPERbgtNPcGhD8UCthc6PmLEQXEWd3PRB5JTxsfmM=
+github.com/tidwall/mvt v0.1.2 h1:hRNN7ZybDmfksMEF/H61F7v65uBmG9uFDr+xTOu2Opw=
+github.com/tidwall/mvt v0.1.2/go.mod h1:UDWI77bePzGClhFHsrPWM9SyzYr9NMZy/uB7BcHXymQ=
 github.com/tidwall/pretty v1.2.0 h1:RWIZEg2iJ8/g6fDDYzMpobmaoGh5OLl4AXtGUGPcqCs=
 github.com/tidwall/pretty v1.2.0/go.mod h1:ITEVvHYasfjBbM0u2Pg8T2nJnzm8xPwvNhhsoaGGjNU=
 github.com/tidwall/redbench v0.1.0 h1:UZYUMhwMMObQRq5xU4SA3lmlJRztXzqtushDii+AmPo=

internal/server/hooks.go

@@ -145,7 +145,7 @@ func (s *Server) cmdSetHook(msg *Message) (
 	hook.ScanWriter, err = s.newScanWriter(
 		&wr, cmsg, args.key, args.output, args.precision, args.glob, false,
 		args.cursor, args.limit, args.wheres, args.whereins, args.whereevals,
-		args.nofields)
+		args.nofields, args.mvt)
 	if err != nil {
 
 		return NOMessage, d, err

internal/server/live.go

@@ -107,7 +107,8 @@ func (s *Server) goLive(
 	s.mu.RLock()
 	sw, err = s.newScanWriter(
 		&wr, msg, lfs.key, lfs.output, lfs.precision, lfs.glob, false,
-		lfs.cursor, lfs.limit, lfs.wheres, lfs.whereins, lfs.whereevals, lfs.nofields)
+		lfs.cursor, lfs.limit, lfs.wheres, lfs.whereins, lfs.whereevals,
+		lfs.nofields, lfs.mvt)
 	s.mu.RUnlock()
 
 	// everything below if for live SCAN, NEARBY, WITHIN, INTERSECTS

internal/server/scan.go

@@ -48,7 +48,7 @@ func (s *Server) cmdScan(msg *Message) (res resp.Value, err error) {
 	sw, err := s.newScanWriter(
 		wr, msg, args.key, args.output, args.precision, args.glob, false,
 		args.cursor, args.limit, args.wheres, args.whereins, args.whereevals,
-		args.nofields)
+		args.nofields, args.mvt)
 	if err != nil {
 		return NOMessage, err
 	}

internal/server/scanner.go

@@ -2,6 +2,7 @@ package server
 
 import (
 	"bytes"
+	"encoding/base64"
 	"errors"
 	"math"
 	"strconv"
@@ -9,6 +10,7 @@ import (
 
 	"github.com/mmcloughlin/geohash"
 	"github.com/tidwall/geojson"
+	"github.com/tidwall/mvt"
 	"github.com/tidwall/resp"
 	"github.com/tidwall/tile38/internal/clip"
 	"github.com/tidwall/tile38/internal/collection"
@@ -56,7 +58,9 @@ type scanWriter struct {
 	globSingle     bool
 	fullFields     bool
 	values         []resp.Value
+	mvtObjs        []geojson.Object
 	matchValues    bool
+	mvt            bool
 	respOut        resp.Value
 }
 
@@ -77,7 +81,7 @@ func (s *Server) newScanWriter(
 	wr *bytes.Buffer, msg *Message, key string, output outputT,
 	precision uint64, globPattern string, matchValues bool,
 	cursor, limit uint64, wheres []whereT, whereins []whereinT,
-	whereevals []whereevalT, nofields bool,
+	whereevals []whereevalT, nofields, mvt bool,
 ) (
 	*scanWriter, error,
 ) {
@@ -97,6 +101,7 @@ func (s *Server) newScanWriter(
 		s:           s,
 		wr:          wr,
 		msg:         msg,
+		mvt:         mvt,
 		limit:       limit,
 		cursor:      cursor,
 		output:      output,
@@ -155,6 +160,9 @@ func (sw *scanWriter) hasFieldsOutput() bool {
 func (sw *scanWriter) writeHead() {
 	sw.mu.Lock()
 	defer sw.mu.Unlock()
+	if sw.mvt {
+		sw.wr.WriteString(`,"mvt":"`)
+	} else {
 		switch sw.msg.OutputType {
 		case JSON:
 			if len(sw.farr) > 0 && sw.hasFieldsOutput() {
@@ -183,6 +191,27 @@ func (sw *scanWriter) writeHead() {
 			}
 		case RESP:
 		}
+	}
+}
+
+func (sw *scanWriter) compileMVT() []byte {
+	var tile mvt.Tile
+	l := tile.AddLayer("default")
+	l.SetExtent(4096)
+
+	for _, g := range sw.mvtObjs {
+		_ = g
+		f := l.AddFeature(mvt.Polygon)
+		// f.MoveTo(128, 96)
+		// f.LineTo(148, 128)
+		// f.LineTo(108, 128)
+		// f.LineTo(128, 96)
+		f.ClosePath()
+	}
+
+	// println(sw.mvtObjs)
+
+	return tile.Render()
 }
 
 func (sw *scanWriter) writeFoot() {
@@ -192,13 +221,22 @@ func (sw *scanWriter) writeFoot() {
 	if !sw.hitLimit {
 		cursor = 0
 	}
+
+	var mvtTile []byte
+	if sw.mvt {
+		mvtTile = sw.compileMVT()
+	}
 	switch sw.msg.OutputType {
 	case JSON:
+		if sw.mvt {
+			sw.wr.WriteString(base64.RawStdEncoding.EncodeToString(mvtTile))
+			sw.wr.WriteByte('"')
+		} else {
 			switch sw.output {
 			default:
 				sw.wr.WriteByte(']')
 			case outputCount:
-
+			}
 		}
 		sw.wr.WriteString(`,"count":` + strconv.FormatUint(sw.count, 10))
 		sw.wr.WriteString(`,"cursor":` + strconv.FormatUint(cursor, 10))
@@ -206,9 +244,11 @@ func (sw *scanWriter) writeFoot() {
 		if sw.output == outputCount {
 			sw.respOut = resp.IntegerValue(int(sw.count))
 		} else {
-			values := []resp.Value{
+			values := []resp.Value{resp.IntegerValue(int(cursor))}
-				resp.IntegerValue(int(cursor)),
+			if sw.mvt {
-				resp.ArrayValue(sw.values),
+				values = append(values, resp.BytesValue(mvtTile))
+			} else {
+				values = append(values, resp.ArrayValue(sw.values))
 			}
 			sw.respOut = resp.ArrayValue(values)
 		}
@@ -384,6 +424,9 @@ func (sw *scanWriter) writeObject(opts ScanWriterParams) bool {
 	if opts.clip != nil {
 		opts.o = clip.Clip(opts.o, opts.clip, &sw.s.geomIndexOpts)
 	}
+	if sw.mvt {
+		sw.mvtObjs = append(sw.mvtObjs, opts.o)
+	} else {
 		switch sw.msg.OutputType {
 		case JSON:
 			var wr bytes.Buffer
@@ -514,6 +557,7 @@ func (sw *scanWriter) writeObject(opts ScanWriterParams) bool {
 				sw.values = append(sw.values, resp.ArrayValue(vals))
 			}
 		}
+	}
 	sw.numberItems++
 	if sw.numberItems == sw.limit {
 		sw.hitLimit = true

internal/server/search.go

@@ -131,7 +131,7 @@ func parseRectArea(ltyp string, vs []string) (nvs []string, rect *geojson.Rect,
 			Min: geometry.Point{X: minLon, Y: minLat},
 			Max: geometry.Point{X: maxLon, Y: maxLat},
 		})
-	case "tile":
+	case "tile", "mvt":
 		var sx, sy, sz string
 		if vs, sx, ok = tokenval(vs); !ok || sx == "" {
 			err = errInvalidNumberOfArguments
@@ -188,6 +188,7 @@ func (s *Server) cmdSearchArgs(
 		err = errInvalidNumberOfArguments
 		return
 	}
+
 	if lfs.searchScanBaseTokens.output == outputBounds {
 		if cmd == "within" || cmd == "intersects" {
 			if _, err := strconv.ParseFloat(typ, 64); err == nil {
@@ -208,6 +209,7 @@ func (s *Server) cmdSearchArgs(
 		err = errInvalidArgument(typ)
 		return
 	}
+
 	switch ltyp {
 	case "point":
 		var slat, slon, smeters string
@@ -352,11 +354,12 @@ func (s *Server) cmdSearchArgs(
 		if err != nil {
 			return
 		}
-	case "bounds", "hash", "tile", "quadkey":
+	case "bounds", "hash", "tile", "mvt", "quadkey":
 		vs, lfs.obj, err = parseRectArea(ltyp, vs)
 		if err != nil {
 			return
 		}
+		lfs.mvt = ltyp == "mvt"
 	case "get":
 		if lfs.clip {
 			err = errInvalidArgument("cannot clip with get")
@@ -463,6 +466,7 @@ var nearbyTypes = map[string]bool{
 var withinOrIntersectsTypes = map[string]bool{
 	"geo": true, "bounds": true, "hash": true, "tile": true, "quadkey": true,
 	"get": true, "object": true, "circle": true, "point": true, "sector": true,
+	"mvt": true,
 }
 
 func (s *Server) cmdNearby(msg *Message) (res resp.Value, err error) {
@@ -489,7 +493,8 @@ func (s *Server) cmdNearby(msg *Message) (res resp.Value, err error) {
 	}
 	sw, err := s.newScanWriter(
 		wr, msg, sargs.key, sargs.output, sargs.precision, sargs.glob, false,
-		sargs.cursor, sargs.limit, sargs.wheres, sargs.whereins, sargs.whereevals, sargs.nofields)
+		sargs.cursor, sargs.limit, sargs.wheres, sargs.whereins,
+		sargs.whereevals, sargs.nofields, sargs.mvt)
 	if err != nil {
 		return NOMessage, err
 	}
@@ -581,7 +586,8 @@ func (s *Server) cmdWithinOrIntersects(cmd string, msg *Message) (res resp.Value
 	}
 	sw, err := s.newScanWriter(
 		wr, msg, sargs.key, sargs.output, sargs.precision, sargs.glob, false,
-		sargs.cursor, sargs.limit, sargs.wheres, sargs.whereins, sargs.whereevals, sargs.nofields)
+		sargs.cursor, sargs.limit, sargs.wheres, sargs.whereins,
+		sargs.whereevals, sargs.nofields, sargs.mvt)
 	if err != nil {
 		return NOMessage, err
 	}
@@ -665,7 +671,8 @@ func (s *Server) cmdSearch(msg *Message) (res resp.Value, err error) {
 	}
 	sw, err := s.newScanWriter(
 		wr, msg, sargs.key, sargs.output, sargs.precision, sargs.glob, true,
-		sargs.cursor, sargs.limit, sargs.wheres, sargs.whereins, sargs.whereevals, sargs.nofields)
+		sargs.cursor, sargs.limit, sargs.wheres, sargs.whereins,
+		sargs.whereevals, sargs.nofields, sargs.mvt)
 	if err != nil {
 		return NOMessage, err
 	}

internal/server/token.go

@@ -213,6 +213,7 @@ type searchScanBaseTokens struct {
 	clip       bool
 	buffer     float64
 	hasbuffer  bool
+	mvt        bool
 }
 
 func (s *Server) parseSearchScanBaseTokens(