mirror of https://github.com/tidwall/tile38.git
375 lines
8.0 KiB
Go
375 lines
8.0 KiB
Go
package controller
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import (
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"bytes"
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"errors"
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"strconv"
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"sync"
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"github.com/tidwall/resp"
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"github.com/tidwall/tile38/controller/collection"
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"github.com/tidwall/tile38/controller/server"
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"github.com/tidwall/tile38/geojson"
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)
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const limitItems = 100
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const capLimit = 100000
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type outputT int
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const (
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outputUnknown outputT = iota
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outputIDs
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outputObjects
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outputCount
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outputPoints
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outputHashes
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outputBounds
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)
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type scanWriter struct {
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mu sync.Mutex
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wr *bytes.Buffer
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msg *server.Message
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col *collection.Collection
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fmap map[string]int
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farr []string
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fvals []float64
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output outputT
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wheres []whereT
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numberItems uint64
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nofields bool
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limit uint64
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hitLimit bool
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once bool
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count uint64
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precision uint64
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glob string
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globEverything bool
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globSingle bool
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fullFields bool
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values []resp.Value
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}
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func (c *Controller) newScanWriter(
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wr *bytes.Buffer, msg *server.Message, key string, output outputT, precision uint64, glob string, limit uint64, wheres []whereT, nofields bool,
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) (
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*scanWriter, error,
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) {
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if limit == 0 {
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limit = limitItems
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} else if limit > capLimit {
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limit = capLimit
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}
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switch output {
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default:
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return nil, errors.New("invalid output type")
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case outputIDs, outputObjects, outputCount, outputBounds, outputPoints, outputHashes:
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}
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sw := &scanWriter{
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wr: wr,
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msg: msg,
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output: output,
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wheres: wheres,
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precision: precision,
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nofields: nofields,
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glob: glob,
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limit: limit,
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}
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if glob == "*" || glob == "" {
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sw.globEverything = true
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} else {
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if !globIsGlob(glob) {
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sw.globSingle = true
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}
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}
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sw.col = c.getCol(key)
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if sw.col != nil {
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sw.fmap = sw.col.FieldMap()
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sw.farr = sw.col.FieldArr()
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}
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sw.fvals = make([]float64, len(sw.farr))
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return sw, nil
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}
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func (sw *scanWriter) hasFieldsOutput() bool {
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switch sw.output {
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default:
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return false
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case outputObjects, outputPoints, outputHashes, outputBounds:
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return !sw.nofields
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}
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}
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func (sw *scanWriter) writeHead() {
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sw.mu.Lock()
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defer sw.mu.Unlock()
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switch sw.msg.OutputType {
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case server.JSON:
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if len(sw.farr) > 0 && sw.hasFieldsOutput() {
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sw.wr.WriteString(`,"fields":[`)
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for i, field := range sw.farr {
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if i > 0 {
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sw.wr.WriteByte(',')
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}
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sw.wr.WriteString(jsonString(field))
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}
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sw.wr.WriteByte(']')
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}
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switch sw.output {
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case outputIDs:
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sw.wr.WriteString(`,"ids":[`)
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case outputObjects:
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sw.wr.WriteString(`,"objects":[`)
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case outputPoints:
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sw.wr.WriteString(`,"points":[`)
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case outputBounds:
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sw.wr.WriteString(`,"bounds":[`)
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case outputHashes:
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sw.wr.WriteString(`,"hashes":[`)
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case outputCount:
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}
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case server.RESP:
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}
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}
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func (sw *scanWriter) writeFoot(cursor uint64) {
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sw.mu.Lock()
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defer sw.mu.Unlock()
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if !sw.hitLimit {
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cursor = 0
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}
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switch sw.msg.OutputType {
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case server.JSON:
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switch sw.output {
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default:
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sw.wr.WriteByte(']')
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case outputCount:
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}
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sw.wr.WriteString(`,"count":` + strconv.FormatUint(sw.count, 10))
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sw.wr.WriteString(`,"cursor":` + strconv.FormatUint(cursor, 10))
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case server.RESP:
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sw.wr.Reset()
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values := []resp.Value{
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resp.IntegerValue(int(cursor)),
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resp.ArrayValue(sw.values),
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}
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data, err := resp.ArrayValue(values).MarshalRESP()
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if err != nil {
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panic("Eek this is bad. Marshal resp should not fail.")
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}
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sw.wr.Write(data)
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}
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}
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func (sw *scanWriter) fieldMatch(fields []float64, o geojson.Object) ([]float64, bool) {
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var z float64
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var gotz bool
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if !sw.hasFieldsOutput() || sw.fullFields {
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for _, where := range sw.wheres {
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if where.field == "z" {
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if !gotz {
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z = o.CalculatedPoint().Z
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}
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if !where.match(z) {
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return sw.fvals, false
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}
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continue
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}
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var value float64
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idx, ok := sw.fmap[where.field]
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if ok {
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if len(fields) > idx {
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value = fields[idx]
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}
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}
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if !where.match(value) {
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return sw.fvals, false
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}
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}
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} else {
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for idx := range sw.farr {
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var value float64
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if len(fields) > idx {
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value = fields[idx]
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}
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sw.fvals[idx] = value
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}
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for _, where := range sw.wheres {
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if where.field == "z" {
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if !gotz {
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z = o.CalculatedPoint().Z
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}
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if !where.match(z) {
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return sw.fvals, false
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}
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continue
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}
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var value float64
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idx, ok := sw.fmap[where.field]
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if ok {
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value = sw.fvals[idx]
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}
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if !where.match(value) {
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return sw.fvals, false
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}
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}
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}
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return sw.fvals, true
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}
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func (sw *scanWriter) writeObject(id string, o geojson.Object, fields []float64, noLock bool) bool {
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if !noLock {
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sw.mu.Lock()
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defer sw.mu.Unlock()
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}
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keepGoing := true
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if !sw.globEverything {
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if sw.globSingle {
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if sw.glob != id {
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return true
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}
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keepGoing = false // return current object and stop iterating
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} else {
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ok, _ := globMatch(sw.glob, id)
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if !ok {
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return true
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}
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}
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}
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nfields, ok := sw.fieldMatch(fields, o)
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if !ok {
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return true
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}
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sw.count++
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if sw.output == outputCount {
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return true
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}
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switch sw.msg.OutputType {
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case server.JSON:
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var wr bytes.Buffer
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var jsfields string
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if sw.once {
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wr.WriteByte(',')
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} else {
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sw.once = true
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}
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if sw.hasFieldsOutput() {
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if sw.fullFields {
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if len(sw.fmap) > 0 {
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jsfields = `,"fields":{`
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var i int
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for field, idx := range sw.fmap {
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if len(fields) > idx {
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if fields[idx] != 0 {
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if i > 0 {
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jsfields += `,`
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}
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jsfields += jsonString(field) + ":" + strconv.FormatFloat(fields[idx], 'f', -1, 64)
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i++
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}
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}
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}
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jsfields += `}`
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}
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} else if len(sw.farr) > 0 {
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jsfields = `,"fields":[`
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for i, field := range nfields {
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if i > 0 {
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jsfields += ","
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}
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jsfields += strconv.FormatFloat(field, 'f', -1, 64)
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}
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jsfields += `]`
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}
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}
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if sw.output == outputIDs {
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wr.WriteString(jsonString(id))
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} else {
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wr.WriteString(`{"id":` + jsonString(id))
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switch sw.output {
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case outputObjects:
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wr.WriteString(`,"object":` + o.JSON())
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case outputPoints:
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wr.WriteString(`,"point":` + o.CalculatedPoint().ExternalJSON())
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case outputHashes:
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p, err := o.Geohash(int(sw.precision))
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if err != nil {
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p = ""
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}
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wr.WriteString(`,"hash":"` + p + `"`)
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case outputBounds:
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wr.WriteString(`,"bounds":` + o.CalculatedBBox().ExternalJSON())
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}
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wr.WriteString(jsfields)
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wr.WriteString(`}`)
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}
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sw.wr.Write(wr.Bytes())
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case server.RESP:
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vals := make([]resp.Value, 1, 3)
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vals[0] = resp.StringValue(id)
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if sw.output == outputIDs {
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sw.values = append(sw.values, vals[0])
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} else {
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switch sw.output {
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case outputObjects:
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vals = append(vals, resp.StringValue(o.JSON()))
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case outputPoints:
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point := o.CalculatedPoint()
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if point.Z != 0 {
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vals = append(vals, resp.ArrayValue([]resp.Value{
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resp.FloatValue(point.Y),
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resp.FloatValue(point.X),
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resp.FloatValue(point.Z),
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}))
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} else {
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vals = append(vals, resp.ArrayValue([]resp.Value{
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resp.FloatValue(point.Y),
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resp.FloatValue(point.X),
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}))
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}
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case outputHashes:
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p, err := o.Geohash(int(sw.precision))
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if err != nil {
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p = ""
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}
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vals = append(vals, resp.StringValue(p))
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case outputBounds:
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bbox := o.CalculatedBBox()
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vals = append(vals, resp.ArrayValue([]resp.Value{
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resp.ArrayValue([]resp.Value{
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resp.FloatValue(bbox.Min.Y),
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resp.FloatValue(bbox.Min.X),
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}),
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resp.ArrayValue([]resp.Value{
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resp.FloatValue(bbox.Max.Y),
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resp.FloatValue(bbox.Max.X),
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}),
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}))
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}
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fvs := orderFields(sw.fmap, fields)
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if len(fvs) > 0 {
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fvals := make([]resp.Value, 0, len(fvs)*2)
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for i, fv := range fvs {
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fvals = append(fvals, resp.StringValue(fv.field), resp.StringValue(strconv.FormatFloat(fv.value, 'f', -1, 64)))
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i++
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}
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vals = append(vals, resp.ArrayValue(fvals))
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}
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sw.values = append(sw.values, resp.ArrayValue(vals))
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}
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}
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sw.numberItems++
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if sw.numberItems == sw.limit {
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sw.hitLimit = true
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return false
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}
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return keepGoing
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}
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