mirror of https://github.com/tidwall/tile38.git
832 lines
18 KiB
Go
832 lines
18 KiB
Go
package server
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import (
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"errors"
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"fmt"
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"math"
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"strconv"
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"strings"
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"github.com/yuin/gopher-lua"
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)
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const defaultSearchOutput = outputObjects
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var errInvalidNumberOfArguments = errors.New("invalid number of arguments")
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var errKeyNotFound = errors.New("key not found")
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var errIDNotFound = errors.New("id not found")
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var errIDAlreadyExists = errors.New("id already exists")
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var errPathNotFound = errors.New("path not found")
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var errKeyHasHooksSet = errors.New("key has hooks set")
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func errInvalidArgument(arg string) error {
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return fmt.Errorf("invalid argument '%s'", arg)
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}
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func errDuplicateArgument(arg string) error {
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return fmt.Errorf("duplicate argument '%s'", arg)
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}
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func token(line string) (newLine, token string) {
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for i := 0; i < len(line); i++ {
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if line[i] == ' ' {
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return line[i+1:], line[:i]
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}
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}
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return "", line
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}
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func tokenval(vs []string) (nvs []string, token string, ok bool) {
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if len(vs) > 0 {
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token = vs[0]
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nvs = vs[1:]
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ok = true
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}
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return
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}
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func tokenvalbytes(vs []string) (nvs []string, token []byte, ok bool) {
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if len(vs) > 0 {
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token = []byte(vs[0])
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nvs = vs[1:]
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ok = true
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}
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return
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}
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func tokenlc(line string) (newLine, token string) {
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for i := 0; i < len(line); i++ {
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ch := line[i]
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if ch == ' ' {
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return line[i+1:], line[:i]
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}
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if ch >= 'A' && ch <= 'Z' {
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lc := make([]byte, 0, 16)
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if i > 0 {
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lc = append(lc, []byte(line[:i])...)
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}
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lc = append(lc, ch+32)
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i++
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for ; i < len(line); i++ {
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ch = line[i]
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if ch == ' ' {
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return line[i+1:], string(lc)
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}
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if ch >= 'A' && ch <= 'Z' {
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lc = append(lc, ch+32)
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} else {
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lc = append(lc, ch)
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}
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}
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return "", string(lc)
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}
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}
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return "", line
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}
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func lcb(s1 []byte, s2 string) bool {
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if len(s1) != len(s2) {
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return false
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}
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for i := 0; i < len(s1); i++ {
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ch := s1[i]
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if ch >= 'A' && ch <= 'Z' {
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if ch+32 != s2[i] {
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return false
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}
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} else if ch != s2[i] {
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return false
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}
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}
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return true
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}
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func lc(s1, s2 string) bool {
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if len(s1) != len(s2) {
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return false
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}
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for i := 0; i < len(s1); i++ {
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ch := s1[i]
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if ch >= 'A' && ch <= 'Z' {
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if ch+32 != s2[i] {
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return false
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}
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} else if ch != s2[i] {
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return false
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}
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}
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return true
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}
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type whereT struct {
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field string
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minx bool
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min float64
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maxx bool
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max float64
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}
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func (where whereT) match(value float64) bool {
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if !where.minx {
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if value < where.min {
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return false
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}
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} else {
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if value <= where.min {
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return false
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}
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}
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if !where.maxx {
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if value > where.max {
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return false
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}
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} else {
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if value >= where.max {
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return false
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}
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}
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return true
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}
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func zMinMaxFromWheres(wheres []whereT) (minZ, maxZ float64) {
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for _, w := range wheres {
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if w.field == "z" {
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minZ = w.min
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maxZ = w.max
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return
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}
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}
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minZ = math.Inf(-1)
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maxZ = math.Inf(+1)
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return
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}
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type whereinT struct {
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field string
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valMap map[float64]struct{}
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}
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func (wherein whereinT) match(value float64) bool {
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_, ok := wherein.valMap[value]
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return ok
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}
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type whereevalT struct {
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c *Server
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luaState *lua.LState
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fn *lua.LFunction
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}
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func (whereeval whereevalT) Close() {
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luaSetRawGlobals(
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whereeval.luaState, map[string]lua.LValue{
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"ARGV": lua.LNil,
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})
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whereeval.c.luapool.Put(whereeval.luaState)
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}
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func (whereeval whereevalT) match(fieldsWithNames map[string]float64) bool {
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fieldsTbl := whereeval.luaState.CreateTable(0, len(fieldsWithNames))
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for field, val := range fieldsWithNames {
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fieldsTbl.RawSetString(field, lua.LNumber(val))
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}
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luaSetRawGlobals(
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whereeval.luaState, map[string]lua.LValue{
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"FIELDS": fieldsTbl,
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})
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defer luaSetRawGlobals(
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whereeval.luaState, map[string]lua.LValue{
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"FIELDS": lua.LNil,
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})
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whereeval.luaState.Push(whereeval.fn)
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if err := whereeval.luaState.PCall(0, 1, nil); err != nil {
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panic(err.Error())
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}
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ret := whereeval.luaState.Get(-1)
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whereeval.luaState.Pop(1)
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// Make bool out of returned lua value
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switch ret.Type() {
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case lua.LTNil:
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return false
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case lua.LTBool:
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return ret == lua.LTrue
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case lua.LTNumber:
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return float64(ret.(lua.LNumber)) != 0
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case lua.LTString:
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return ret.String() != ""
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case lua.LTTable:
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tbl := ret.(*lua.LTable)
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if tbl.Len() != 0 {
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return true
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}
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var match bool
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tbl.ForEach(func(lk lua.LValue, lv lua.LValue) { match = true })
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return match
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}
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panic(fmt.Sprintf("Script returned value of type %s", ret.Type()))
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}
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type searchScanBaseTokens struct {
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key string
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cursor uint64
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output outputT
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precision uint64
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lineout string
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fence bool
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distance bool
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nodwell bool
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detect map[string]bool
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accept map[string]bool
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glob string
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wheres []whereT
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whereins []whereinT
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whereevals []whereevalT
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nofields bool
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ulimit bool
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limit uint64
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usparse bool
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sparse uint8
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desc bool
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clip bool
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}
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func (c *Server) parseSearchScanBaseTokens(
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cmd string, t searchScanBaseTokens, vs []string,
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) (
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vsout []string, tout searchScanBaseTokens, err error,
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) {
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var ok bool
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if vs, t.key, ok = tokenval(vs); !ok || t.key == "" {
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err = errInvalidNumberOfArguments
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return
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}
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fromFence := t.fence
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var slimit string
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var ssparse string
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var scursor string
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var asc bool
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for {
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nvs, wtok, ok := tokenval(vs)
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if ok && len(wtok) > 0 {
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switch strings.ToLower(wtok) {
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case "cursor":
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vs = nvs
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if scursor != "" {
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err = errDuplicateArgument(strings.ToUpper(wtok))
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return
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}
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if vs, scursor, ok = tokenval(vs); !ok || scursor == "" {
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err = errInvalidNumberOfArguments
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return
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}
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continue
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case "where":
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vs = nvs
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var field, smin, smax string
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if vs, field, ok = tokenval(vs); !ok || field == "" {
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err = errInvalidNumberOfArguments
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return
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}
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if vs, smin, ok = tokenval(vs); !ok || smin == "" {
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err = errInvalidNumberOfArguments
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return
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}
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if vs, smax, ok = tokenval(vs); !ok || smax == "" {
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err = errInvalidNumberOfArguments
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return
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}
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var minx, maxx bool
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var min, max float64
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if strings.ToLower(smin) == "-inf" {
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min = math.Inf(-1)
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} else {
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if strings.HasPrefix(smin, "(") {
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minx = true
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smin = smin[1:]
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}
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min, err = strconv.ParseFloat(smin, 64)
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if err != nil {
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err = errInvalidArgument(smin)
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return
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}
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}
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if strings.ToLower(smax) == "+inf" {
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max = math.Inf(+1)
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} else {
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if strings.HasPrefix(smax, "(") {
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maxx = true
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smax = smax[1:]
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}
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max, err = strconv.ParseFloat(smax, 64)
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if err != nil {
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err = errInvalidArgument(smax)
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return
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}
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}
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t.wheres = append(t.wheres, whereT{field, minx, min, maxx, max})
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continue
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case "wherein":
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vs = nvs
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var field, nvalsStr, valStr string
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if vs, field, ok = tokenval(vs); !ok || field == "" {
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err = errInvalidNumberOfArguments
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return
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}
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if vs, nvalsStr, ok = tokenval(vs); !ok || nvalsStr == "" {
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err = errInvalidNumberOfArguments
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return
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}
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var i, nvals uint64
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if nvals, err = strconv.ParseUint(nvalsStr, 10, 64); err != nil {
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err = errInvalidArgument(nvalsStr)
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return
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}
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valMap := make(map[float64]struct{})
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var val float64
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var empty struct{}
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for i = 0; i < nvals; i++ {
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if vs, valStr, ok = tokenval(vs); !ok || valStr == "" {
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err = errInvalidNumberOfArguments
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return
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}
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if val, err = strconv.ParseFloat(valStr, 64); err != nil {
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err = errInvalidArgument(valStr)
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return
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}
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valMap[val] = empty
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}
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t.whereins = append(t.whereins, whereinT{field, valMap})
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continue
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case "whereevalsha":
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fallthrough
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case "whereeval":
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scriptIsSha := strings.ToLower(wtok) == "whereevalsha"
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vs = nvs
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var script, nargsStr, arg string
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if vs, script, ok = tokenval(vs); !ok || script == "" {
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err = errInvalidNumberOfArguments
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return
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}
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if vs, nargsStr, ok = tokenval(vs); !ok || nargsStr == "" {
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err = errInvalidNumberOfArguments
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return
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}
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var i, nargs uint64
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if nargs, err = strconv.ParseUint(nargsStr, 10, 64); err != nil {
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err = errInvalidArgument(nargsStr)
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return
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}
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var luaState *lua.LState
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luaState, err = c.luapool.Get()
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if err != nil {
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return
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}
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argsTbl := luaState.CreateTable(len(vs), 0)
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for i = 0; i < nargs; i++ {
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if vs, arg, ok = tokenval(vs); !ok || arg == "" {
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err = errInvalidNumberOfArguments
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return
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}
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argsTbl.Append(lua.LString(arg))
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}
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var shaSum string
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if scriptIsSha {
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shaSum = script
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} else {
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shaSum = Sha1Sum(script)
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}
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luaSetRawGlobals(
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luaState, map[string]lua.LValue{
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"ARGV": argsTbl,
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})
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compiled, ok := c.luascripts.Get(shaSum)
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var fn *lua.LFunction
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if ok {
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fn = &lua.LFunction{
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IsG: false,
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Env: luaState.Env,
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Proto: compiled,
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GFunction: nil,
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Upvalues: make([]*lua.Upvalue, 0),
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}
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} else if scriptIsSha {
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err = errShaNotFound
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return
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} else {
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fn, err = luaState.Load(strings.NewReader(script), "f_"+shaSum)
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if err != nil {
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err = makeSafeErr(err)
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return
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}
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c.luascripts.Put(shaSum, fn.Proto)
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}
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t.whereevals = append(t.whereevals, whereevalT{c, luaState, fn})
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continue
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case "nofields":
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vs = nvs
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if t.nofields {
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err = errDuplicateArgument(strings.ToUpper(wtok))
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return
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}
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t.nofields = true
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continue
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case "limit":
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vs = nvs
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if slimit != "" {
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err = errDuplicateArgument(strings.ToUpper(wtok))
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return
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}
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if vs, slimit, ok = tokenval(vs); !ok || slimit == "" {
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err = errInvalidNumberOfArguments
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return
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}
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continue
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case "sparse":
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vs = nvs
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if ssparse != "" {
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err = errDuplicateArgument(strings.ToUpper(wtok))
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return
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}
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if vs, ssparse, ok = tokenval(vs); !ok || ssparse == "" {
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err = errInvalidNumberOfArguments
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return
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}
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continue
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case "fence":
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vs = nvs
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if t.fence && !fromFence {
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err = errDuplicateArgument(strings.ToUpper(wtok))
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return
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}
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t.fence = true
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continue
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case "commands":
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vs = nvs
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if t.accept != nil {
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err = errDuplicateArgument(strings.ToUpper(wtok))
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return
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}
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t.accept = make(map[string]bool)
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var peek string
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if vs, peek, ok = tokenval(vs); !ok || peek == "" {
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err = errInvalidNumberOfArguments
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return
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}
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for _, s := range strings.Split(peek, ",") {
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part := strings.TrimSpace(strings.ToLower(s))
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if t.accept[part] {
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err = errDuplicateArgument(s)
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return
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}
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t.accept[part] = true
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}
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if len(t.accept) == 0 {
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t.accept = nil
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}
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continue
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case "distance":
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vs = nvs
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if t.distance {
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err = errDuplicateArgument(strings.ToUpper(wtok))
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return
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}
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t.distance = true
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continue
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case "detect":
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vs = nvs
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if t.detect != nil {
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err = errDuplicateArgument(strings.ToUpper(wtok))
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return
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}
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t.detect = make(map[string]bool)
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var peek string
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if vs, peek, ok = tokenval(vs); !ok || peek == "" {
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err = errInvalidNumberOfArguments
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return
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}
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for _, s := range strings.Split(peek, ",") {
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part := strings.TrimSpace(strings.ToLower(s))
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switch part {
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default:
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err = errInvalidArgument(peek)
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return
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case "inside", "outside", "enter", "exit", "cross":
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}
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if t.detect[part] {
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err = errDuplicateArgument(s)
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return
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}
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t.detect[part] = true
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}
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if len(t.detect) == 0 {
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t.detect = map[string]bool{
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"inside": true,
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"outside": true,
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"enter": true,
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"exit": true,
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"cross": true,
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}
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}
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continue
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case "nodwell":
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vs = nvs
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if t.desc || asc {
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err = errDuplicateArgument(strings.ToUpper(wtok))
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return
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}
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t.nodwell = true
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continue
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case "desc":
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vs = nvs
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if t.desc || asc {
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err = errDuplicateArgument(strings.ToUpper(wtok))
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return
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}
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t.desc = true
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continue
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case "asc":
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vs = nvs
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if t.desc || asc {
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err = errDuplicateArgument(strings.ToUpper(wtok))
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return
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}
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asc = true
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continue
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case "match":
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vs = nvs
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if t.glob != "" {
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err = errDuplicateArgument(strings.ToUpper(wtok))
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return
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}
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if vs, t.glob, ok = tokenval(vs); !ok || t.glob == "" {
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err = errInvalidNumberOfArguments
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return
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}
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continue
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case "clip":
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vs = nvs
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if t.clip {
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err = errDuplicateArgument(strings.ToUpper(wtok))
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return
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}
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t.clip = true
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continue
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}
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}
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break
|
|
}
|
|
|
|
// check to make sure that there aren't any conflicts
|
|
if cmd == "scan" || cmd == "search" {
|
|
if ssparse != "" {
|
|
err = errors.New("SPARSE is not allowed for " + strings.ToUpper(cmd))
|
|
return
|
|
}
|
|
if t.fence {
|
|
err = errors.New("FENCE is not allowed for " + strings.ToUpper(cmd))
|
|
return
|
|
}
|
|
} else {
|
|
if t.desc {
|
|
err = errors.New("DESC is not allowed for " + strings.ToUpper(cmd))
|
|
return
|
|
}
|
|
if asc {
|
|
err = errors.New("ASC is not allowed for " + strings.ToUpper(cmd))
|
|
return
|
|
}
|
|
}
|
|
if ssparse != "" && slimit != "" {
|
|
err = errors.New("LIMIT is not allowed when SPARSE is specified")
|
|
return
|
|
}
|
|
if scursor != "" && ssparse != "" {
|
|
err = errors.New("CURSOR is not allowed when SPARSE is specified")
|
|
return
|
|
}
|
|
if scursor != "" && t.fence {
|
|
err = errors.New("CURSOR is not allowed when FENCE is specified")
|
|
return
|
|
}
|
|
if t.detect != nil && !t.fence {
|
|
err = errors.New("DETECT is not allowed when FENCE is not specified")
|
|
return
|
|
}
|
|
|
|
t.output = defaultSearchOutput
|
|
var nvs []string
|
|
var sprecision string
|
|
var which string
|
|
if nvs, which, ok = tokenval(vs); ok && which != "" {
|
|
updline := true
|
|
switch strings.ToLower(which) {
|
|
default:
|
|
if cmd == "scan" {
|
|
err = errInvalidArgument(which)
|
|
return
|
|
}
|
|
updline = false
|
|
case "count":
|
|
t.output = outputCount
|
|
case "objects":
|
|
t.output = outputObjects
|
|
case "points":
|
|
t.output = outputPoints
|
|
case "hashes":
|
|
t.output = outputHashes
|
|
if nvs, sprecision, ok = tokenval(nvs); !ok || sprecision == "" {
|
|
err = errInvalidNumberOfArguments
|
|
return
|
|
}
|
|
case "bounds":
|
|
t.output = outputBounds
|
|
case "ids":
|
|
t.output = outputIDs
|
|
}
|
|
if updline {
|
|
vs = nvs
|
|
}
|
|
}
|
|
if scursor != "" {
|
|
if t.cursor, err = strconv.ParseUint(scursor, 10, 64); err != nil {
|
|
err = errInvalidArgument(scursor)
|
|
return
|
|
}
|
|
}
|
|
if sprecision != "" {
|
|
if t.precision, err = strconv.ParseUint(sprecision, 10, 64); err != nil || t.precision == 0 || t.precision > 64 {
|
|
err = errInvalidArgument(sprecision)
|
|
return
|
|
}
|
|
}
|
|
if slimit != "" {
|
|
t.ulimit = true
|
|
if t.limit, err = strconv.ParseUint(slimit, 10, 64); err != nil || t.limit == 0 {
|
|
err = errInvalidArgument(slimit)
|
|
return
|
|
}
|
|
}
|
|
if ssparse != "" {
|
|
t.usparse = true
|
|
var sparse uint64
|
|
if sparse, err = strconv.ParseUint(ssparse, 10, 8); err != nil || sparse == 0 || sparse > 8 {
|
|
err = errInvalidArgument(ssparse)
|
|
return
|
|
}
|
|
t.sparse = uint8(sparse)
|
|
t.limit = math.MaxUint64
|
|
}
|
|
vsout = vs
|
|
tout = t
|
|
return
|
|
}
|
|
|
|
type parentStack []*areaExpression
|
|
|
|
func (ps *parentStack) isEmpty() bool {
|
|
return len(*ps) == 0
|
|
}
|
|
|
|
func (ps *parentStack) push(e *areaExpression) {
|
|
*ps = append(*ps, e)
|
|
}
|
|
|
|
func (ps *parentStack) pop() (e *areaExpression, empty bool) {
|
|
n := len(*ps)
|
|
if n == 0 {
|
|
return nil, true
|
|
}
|
|
x := (*ps)[n-1]
|
|
*ps = (*ps)[:n-1]
|
|
return x, false
|
|
}
|
|
|
|
func (s *Server) parseAreaExpression(vsin []string, doClip bool) (vsout []string, ae *areaExpression, err error) {
|
|
ps := &parentStack{}
|
|
vsout = vsin[:]
|
|
var negate, needObj bool
|
|
loop:
|
|
for {
|
|
nvs, wtok, ok := tokenval(vsout)
|
|
if !ok || len(wtok) == 0 {
|
|
break
|
|
}
|
|
switch strings.ToLower(wtok) {
|
|
case tokenLParen:
|
|
newExpr := &areaExpression{negate: negate, op: NOOP}
|
|
negate = false
|
|
needObj = false
|
|
if ae != nil {
|
|
ae.children = append(ae.children, newExpr)
|
|
}
|
|
ae = newExpr
|
|
ps.push(ae)
|
|
vsout = nvs
|
|
case tokenRParen:
|
|
if needObj {
|
|
err = errInvalidArgument(tokenRParen)
|
|
return
|
|
}
|
|
if parent, empty := ps.pop(); empty {
|
|
err = errInvalidArgument(tokenRParen)
|
|
return
|
|
} else {
|
|
ae = parent
|
|
}
|
|
vsout = nvs
|
|
case tokenNOT:
|
|
negate = true
|
|
needObj = true
|
|
vsout = nvs
|
|
case tokenAND:
|
|
if needObj {
|
|
err = errInvalidArgument(tokenAND)
|
|
return
|
|
}
|
|
needObj = true
|
|
if ae == nil {
|
|
err = errInvalidArgument(tokenAND)
|
|
return
|
|
} else if ae.obj == nil {
|
|
switch ae.op {
|
|
case OR:
|
|
numChildren := len(ae.children)
|
|
if numChildren < 2 {
|
|
err = errInvalidNumberOfArguments
|
|
return
|
|
} else {
|
|
ae.children = append(
|
|
ae.children[:numChildren-1],
|
|
&areaExpression{
|
|
op: AND,
|
|
children: []*areaExpression{ae.children[numChildren-1]}})
|
|
}
|
|
case NOOP:
|
|
ae.op = AND
|
|
}
|
|
} else {
|
|
ae = &areaExpression{op: AND, children: []*areaExpression{ae}}
|
|
}
|
|
vsout = nvs
|
|
case tokenOR:
|
|
if needObj {
|
|
err = errInvalidArgument(tokenOR)
|
|
return
|
|
}
|
|
needObj = true
|
|
if ae == nil {
|
|
err = errInvalidArgument(tokenOR)
|
|
return
|
|
} else if ae.obj == nil {
|
|
switch ae.op {
|
|
case AND:
|
|
if len(ae.children) < 2 {
|
|
err = errInvalidNumberOfArguments
|
|
return
|
|
} else {
|
|
ae = &areaExpression{op: OR, children: []*areaExpression{ae}}
|
|
}
|
|
case NOOP:
|
|
ae.op = OR
|
|
}
|
|
} else {
|
|
ae = &areaExpression{op: OR, children: []*areaExpression{ae}}
|
|
}
|
|
vsout = nvs
|
|
case "point", "circle", "object", "bounds", "hash", "quadkey", "tile", "get":
|
|
if parsedVs, parsedObj, areaErr := s.parseArea(vsout, doClip); areaErr != nil {
|
|
err = areaErr
|
|
return
|
|
} else {
|
|
newExpr := &areaExpression{negate: negate, obj: parsedObj, op: NOOP}
|
|
negate = false
|
|
needObj = false
|
|
if ae == nil {
|
|
ae = newExpr
|
|
} else {
|
|
ae.children = append(ae.children, newExpr)
|
|
}
|
|
vsout = parsedVs
|
|
}
|
|
default:
|
|
if needObj {
|
|
err = errInvalidArgument(wtok)
|
|
return
|
|
}
|
|
break loop
|
|
}
|
|
}
|
|
if !ps.isEmpty() || needObj || ae == nil || (ae.obj == nil && len(ae.children) == 0) {
|
|
err = errInvalidNumberOfArguments
|
|
}
|
|
return
|
|
}
|