mirror of https://github.com/tidwall/tile38.git
476 lines
11 KiB
Go
476 lines
11 KiB
Go
package server
|
|
|
|
import (
|
|
"bytes"
|
|
"errors"
|
|
"math"
|
|
"strconv"
|
|
|
|
"github.com/mmcloughlin/geohash"
|
|
"github.com/tidwall/btree"
|
|
"github.com/tidwall/geojson"
|
|
"github.com/tidwall/resp"
|
|
"github.com/tidwall/tile38/internal/clip"
|
|
"github.com/tidwall/tile38/internal/collection"
|
|
"github.com/tidwall/tile38/internal/field"
|
|
"github.com/tidwall/tile38/internal/glob"
|
|
"github.com/tidwall/tile38/internal/object"
|
|
)
|
|
|
|
const limitItems = 100
|
|
|
|
type outputT int
|
|
|
|
const (
|
|
outputUnknown outputT = iota
|
|
outputIDs
|
|
outputObjects
|
|
outputCount
|
|
outputPoints
|
|
outputHashes
|
|
outputBounds
|
|
)
|
|
|
|
type scanWriter struct {
|
|
s *Server
|
|
wr *bytes.Buffer
|
|
name string
|
|
msg *Message
|
|
col *collection.Collection
|
|
fkeys btree.Set[string]
|
|
output outputT
|
|
wheres []whereT
|
|
whereins []whereinT
|
|
whereevals []whereevalT
|
|
numberIters uint64
|
|
numberItems uint64
|
|
nofields bool
|
|
cursor uint64
|
|
limit uint64
|
|
hitLimit bool
|
|
once bool
|
|
count uint64
|
|
precision uint64
|
|
globs []string
|
|
globEverything bool
|
|
fullFields bool
|
|
values []resp.Value
|
|
matchValues bool
|
|
respOut resp.Value
|
|
filled []ScanWriterParams
|
|
}
|
|
|
|
type ScanWriterParams struct {
|
|
obj *object.Object
|
|
dist float64
|
|
distOutput bool // query or fence requested distance output
|
|
noTest bool
|
|
ignoreGlobMatch bool
|
|
clip geojson.Object
|
|
skipTesting bool
|
|
}
|
|
|
|
func (s *Server) newScanWriter(
|
|
wr *bytes.Buffer, msg *Message, name string, output outputT,
|
|
precision uint64, globs []string, matchValues bool,
|
|
cursor, limit uint64, wheres []whereT, whereins []whereinT,
|
|
whereevals []whereevalT, nofields bool,
|
|
) (
|
|
*scanWriter, error,
|
|
) {
|
|
switch output {
|
|
default:
|
|
return nil, errors.New("invalid output type")
|
|
case outputIDs, outputObjects, outputCount, outputBounds, outputPoints, outputHashes:
|
|
}
|
|
if limit == 0 {
|
|
if output == outputCount {
|
|
limit = math.MaxUint64
|
|
} else {
|
|
limit = limitItems
|
|
}
|
|
}
|
|
sw := &scanWriter{
|
|
s: s,
|
|
wr: wr,
|
|
name: name,
|
|
msg: msg,
|
|
globs: globs,
|
|
limit: limit,
|
|
cursor: cursor,
|
|
output: output,
|
|
nofields: nofields,
|
|
precision: precision,
|
|
whereevals: whereevals,
|
|
matchValues: matchValues,
|
|
}
|
|
|
|
if len(globs) == 0 || (len(globs) == 1 && globs[0] == "*") {
|
|
sw.globEverything = true
|
|
}
|
|
sw.wheres = wheres
|
|
sw.whereins = whereins
|
|
sw.col, _ = sw.s.cols.Get(sw.name)
|
|
return sw, nil
|
|
}
|
|
|
|
func (sw *scanWriter) hasFieldsOutput() bool {
|
|
switch sw.output {
|
|
default:
|
|
return false
|
|
case outputObjects, outputPoints, outputHashes, outputBounds:
|
|
return !sw.nofields
|
|
}
|
|
}
|
|
|
|
func (sw *scanWriter) writeFoot() {
|
|
switch sw.msg.OutputType {
|
|
case JSON:
|
|
if sw.fkeys.Len() > 0 && sw.hasFieldsOutput() {
|
|
sw.wr.WriteString(`,"fields":[`)
|
|
var i int
|
|
sw.fkeys.Scan(func(name string) bool {
|
|
if i > 0 {
|
|
sw.wr.WriteByte(',')
|
|
}
|
|
sw.wr.WriteString(jsonString(name))
|
|
i++
|
|
return true
|
|
})
|
|
sw.wr.WriteByte(']')
|
|
}
|
|
switch sw.output {
|
|
case outputIDs:
|
|
sw.wr.WriteString(`,"ids":[`)
|
|
case outputObjects:
|
|
sw.wr.WriteString(`,"objects":[`)
|
|
case outputPoints:
|
|
sw.wr.WriteString(`,"points":[`)
|
|
case outputBounds:
|
|
sw.wr.WriteString(`,"bounds":[`)
|
|
case outputHashes:
|
|
sw.wr.WriteString(`,"hashes":[`)
|
|
case outputCount:
|
|
|
|
}
|
|
case RESP:
|
|
}
|
|
|
|
for _, opts := range sw.filled {
|
|
sw.writeFilled(opts)
|
|
}
|
|
|
|
cursor := sw.numberIters
|
|
if !sw.hitLimit {
|
|
cursor = 0
|
|
}
|
|
switch sw.msg.OutputType {
|
|
case JSON:
|
|
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))
|
|
case RESP:
|
|
if sw.output == outputCount {
|
|
sw.respOut = resp.IntegerValue(int(sw.count))
|
|
} else {
|
|
values := []resp.Value{
|
|
resp.IntegerValue(int(cursor)),
|
|
resp.ArrayValue(sw.values),
|
|
}
|
|
sw.respOut = resp.ArrayValue(values)
|
|
}
|
|
}
|
|
}
|
|
|
|
func extractZCoordinate(o geojson.Object) float64 {
|
|
for {
|
|
switch g := o.(type) {
|
|
case *geojson.Point:
|
|
return g.Z()
|
|
case *geojson.Feature:
|
|
o = g.Base()
|
|
default:
|
|
return 0
|
|
}
|
|
}
|
|
}
|
|
|
|
func getFieldValue(o *object.Object, name string) field.Value {
|
|
if name == "z" {
|
|
z := extractZCoordinate(o.Geo())
|
|
return field.ValueOf(strconv.FormatFloat(z, 'f', -1, 64))
|
|
}
|
|
return o.Fields().Get(name).Value()
|
|
}
|
|
|
|
func (sw *scanWriter) fieldMatch(o *object.Object) (bool, error) {
|
|
for _, where := range sw.wheres {
|
|
if !where.match(getFieldValue(o, where.name)) {
|
|
return false, nil
|
|
}
|
|
}
|
|
for _, wherein := range sw.whereins {
|
|
if !wherein.match(getFieldValue(o, wherein.name)) {
|
|
return false, nil
|
|
}
|
|
}
|
|
if len(sw.whereevals) > 0 {
|
|
fieldNames := make(map[string]field.Value)
|
|
if objIsSpatial(o.Geo()) {
|
|
z := extractZCoordinate(o.Geo())
|
|
fieldNames["z"] = field.ValueOf(strconv.FormatFloat(z, 'f', -1, 64))
|
|
}
|
|
o.Fields().Scan(func(f field.Field) bool {
|
|
fieldNames[f.Name()] = f.Value()
|
|
return true
|
|
})
|
|
for _, whereval := range sw.whereevals {
|
|
match, err := whereval.match(fieldNames)
|
|
if err != nil {
|
|
return false, err
|
|
}
|
|
if !match {
|
|
return false, nil
|
|
}
|
|
}
|
|
}
|
|
return true, nil
|
|
}
|
|
|
|
func (sw *scanWriter) globMatch(o *object.Object) (ok, keepGoing bool) {
|
|
if sw.globEverything {
|
|
return true, true
|
|
}
|
|
var val string
|
|
if sw.matchValues {
|
|
val = o.String()
|
|
} else {
|
|
val = o.ID()
|
|
}
|
|
for _, pattern := range sw.globs {
|
|
ok, _ := glob.Match(pattern, val)
|
|
if ok {
|
|
return true, true
|
|
}
|
|
}
|
|
return false, true
|
|
}
|
|
|
|
// Increment cursor
|
|
func (sw *scanWriter) Offset() uint64 {
|
|
return sw.cursor
|
|
}
|
|
|
|
func (sw *scanWriter) Step(n uint64) {
|
|
sw.numberIters += n
|
|
}
|
|
|
|
// ok is whether the object passes the test and should be written
|
|
// keepGoing is whether there could be more objects to test
|
|
func (sw *scanWriter) testObject(o *object.Object,
|
|
) (ok, keepGoing bool, err error) {
|
|
match, kg := sw.globMatch(o)
|
|
if !match {
|
|
return false, kg, nil
|
|
}
|
|
ok, err = sw.fieldMatch(o)
|
|
if err != nil {
|
|
return false, false, err
|
|
}
|
|
return ok, true, nil
|
|
}
|
|
|
|
func (sw *scanWriter) pushObject(opts ScanWriterParams) (keepGoing bool, err error) {
|
|
keepGoing = true
|
|
if !opts.noTest {
|
|
var ok bool
|
|
var err error
|
|
ok, keepGoing, err = sw.testObject(opts.obj)
|
|
if err != nil {
|
|
return false, err
|
|
}
|
|
if !ok {
|
|
return keepGoing, nil
|
|
}
|
|
}
|
|
sw.count++
|
|
if sw.output == outputCount {
|
|
return sw.count < sw.limit, nil
|
|
}
|
|
if opts.clip != nil {
|
|
// create a newly clipped object
|
|
opts.obj = object.New(
|
|
opts.obj.ID(),
|
|
clip.Clip(opts.obj.Geo(), opts.clip, &sw.s.geomIndexOpts),
|
|
0, opts.obj.Expires(),
|
|
opts.obj.Fields(),
|
|
)
|
|
}
|
|
|
|
if !sw.fullFields {
|
|
opts.obj.Fields().Scan(func(f field.Field) bool {
|
|
sw.fkeys.Insert(f.Name())
|
|
return true
|
|
})
|
|
}
|
|
sw.filled = append(sw.filled, opts)
|
|
sw.numberItems++
|
|
if sw.numberItems == sw.limit {
|
|
sw.hitLimit = true
|
|
return false, nil
|
|
}
|
|
return keepGoing, nil
|
|
}
|
|
|
|
func (sw *scanWriter) writeObject(opts ScanWriterParams) {
|
|
n := len(sw.filled)
|
|
sw.pushObject(opts)
|
|
if len(sw.filled) > n {
|
|
sw.writeFilled(sw.filled[len(sw.filled)-1])
|
|
sw.filled = sw.filled[:n]
|
|
}
|
|
}
|
|
|
|
func (sw *scanWriter) writeFilled(opts ScanWriterParams) {
|
|
switch sw.msg.OutputType {
|
|
case JSON:
|
|
var wr bytes.Buffer
|
|
var jsfields string
|
|
if sw.once {
|
|
wr.WriteByte(',')
|
|
} else {
|
|
sw.once = true
|
|
}
|
|
fieldsOutput := sw.hasFieldsOutput()
|
|
if fieldsOutput && sw.fullFields {
|
|
if opts.obj.Fields().Len() > 0 {
|
|
jsfields = `,"fields":{`
|
|
var i int
|
|
opts.obj.Fields().Scan(func(f field.Field) bool {
|
|
if !f.Value().IsZero() {
|
|
if i > 0 {
|
|
jsfields += `,`
|
|
}
|
|
jsfields += jsonString(f.Name()) + ":" + f.Value().JSON()
|
|
i++
|
|
}
|
|
return true
|
|
})
|
|
jsfields += `}`
|
|
}
|
|
} else if fieldsOutput && sw.fkeys.Len() > 0 && !sw.fullFields {
|
|
jsfields = `,"fields":[`
|
|
var i int
|
|
sw.fkeys.Scan(func(name string) bool {
|
|
if i > 0 {
|
|
jsfields += `,`
|
|
}
|
|
f := opts.obj.Fields().Get(name)
|
|
jsfields += f.Value().JSON()
|
|
i++
|
|
return true
|
|
})
|
|
jsfields += `]`
|
|
}
|
|
if sw.output == outputIDs {
|
|
if opts.distOutput || opts.dist > 0 {
|
|
wr.WriteString(`{"id":` + jsonString(opts.obj.ID()) +
|
|
`,"distance":` + strconv.FormatFloat(opts.dist, 'f', -1, 64) + "}")
|
|
} else {
|
|
wr.WriteString(jsonString(opts.obj.ID()))
|
|
}
|
|
} else {
|
|
wr.WriteString(`{"id":` + jsonString(opts.obj.ID()))
|
|
switch sw.output {
|
|
case outputObjects:
|
|
wr.WriteString(`,"object":` + string(opts.obj.Geo().AppendJSON(nil)))
|
|
case outputPoints:
|
|
wr.WriteString(`,"point":` + string(appendJSONSimplePoint(nil, opts.obj.Geo())))
|
|
case outputHashes:
|
|
center := opts.obj.Geo().Center()
|
|
p := geohash.EncodeWithPrecision(center.Y, center.X, uint(sw.precision))
|
|
wr.WriteString(`,"hash":"` + p + `"`)
|
|
case outputBounds:
|
|
wr.WriteString(`,"bounds":` + string(appendJSONSimpleBounds(nil, opts.obj.Geo())))
|
|
}
|
|
wr.WriteString(jsfields)
|
|
if opts.distOutput || opts.dist > 0 {
|
|
wr.WriteString(`,"distance":` + strconv.FormatFloat(opts.dist, 'f', -1, 64))
|
|
}
|
|
|
|
wr.WriteString(`}`)
|
|
}
|
|
sw.wr.Write(wr.Bytes())
|
|
case RESP:
|
|
vals := make([]resp.Value, 1, 3)
|
|
vals[0] = resp.StringValue(opts.obj.ID())
|
|
if sw.output == outputIDs {
|
|
if opts.distOutput || opts.dist > 0 {
|
|
vals = append(vals, resp.FloatValue(opts.dist))
|
|
sw.values = append(sw.values, resp.ArrayValue(vals))
|
|
} else {
|
|
sw.values = append(sw.values, vals[0])
|
|
}
|
|
} else {
|
|
switch sw.output {
|
|
case outputObjects:
|
|
vals = append(vals, resp.StringValue(opts.obj.String()))
|
|
case outputPoints:
|
|
point := opts.obj.Geo().Center()
|
|
z := extractZCoordinate(opts.obj.Geo())
|
|
if z != 0 {
|
|
vals = append(vals, resp.ArrayValue([]resp.Value{
|
|
resp.FloatValue(point.Y),
|
|
resp.FloatValue(point.X),
|
|
resp.FloatValue(z),
|
|
}))
|
|
} else {
|
|
vals = append(vals, resp.ArrayValue([]resp.Value{
|
|
resp.FloatValue(point.Y),
|
|
resp.FloatValue(point.X),
|
|
}))
|
|
}
|
|
case outputHashes:
|
|
center := opts.obj.Geo().Center()
|
|
p := geohash.EncodeWithPrecision(center.Y, center.X, uint(sw.precision))
|
|
vals = append(vals, resp.StringValue(p))
|
|
case outputBounds:
|
|
bbox := opts.obj.Rect()
|
|
vals = append(vals, resp.ArrayValue([]resp.Value{
|
|
resp.ArrayValue([]resp.Value{
|
|
resp.FloatValue(bbox.Min.Y),
|
|
resp.FloatValue(bbox.Min.X),
|
|
}),
|
|
resp.ArrayValue([]resp.Value{
|
|
resp.FloatValue(bbox.Max.Y),
|
|
resp.FloatValue(bbox.Max.X),
|
|
}),
|
|
}))
|
|
}
|
|
if sw.hasFieldsOutput() {
|
|
var fvals []resp.Value
|
|
var i int
|
|
opts.obj.Fields().Scan(func(f field.Field) bool {
|
|
if !f.Value().IsZero() {
|
|
fvals = append(fvals, resp.StringValue(f.Name()), resp.StringValue(f.Value().Data()))
|
|
i++
|
|
}
|
|
return true
|
|
})
|
|
if len(fvals) > 0 {
|
|
vals = append(vals, resp.ArrayValue(fvals))
|
|
}
|
|
}
|
|
if opts.distOutput || opts.dist > 0 {
|
|
vals = append(vals, resp.FloatValue(opts.dist))
|
|
}
|
|
sw.values = append(sw.values, resp.ArrayValue(vals))
|
|
}
|
|
}
|
|
}
|