124 lines
1.9 KiB
Go
124 lines
1.9 KiB
Go
package serv
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import (
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"bytes"
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"crypto/sha1"
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"encoding/hex"
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"io"
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"sort"
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"strings"
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"github.com/cespare/xxhash/v2"
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"github.com/dosco/super-graph/jsn"
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)
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func mkkey(h *xxhash.Digest, k1 string, k2 string) uint64 {
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h.WriteString(k1)
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h.WriteString(k2)
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v := h.Sum64()
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h.Reset()
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return v
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}
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func gqlHash(b string, vars []byte, role string) string {
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b = strings.TrimSpace(b)
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h := sha1.New()
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query := "query"
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s, e := 0, 0
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space := []byte{' '}
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starting := true
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var b0, b1 byte
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for {
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if starting && b[e] == 'q' {
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n := 0
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se := e
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for e < len(b) && n < len(query) && b[e] == query[n] {
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n++
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e++
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}
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if n != len(query) {
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io.WriteString(h, strings.ToLower(b[se:e]))
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}
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}
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if ws(b[e]) {
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for e < len(b) && ws(b[e]) {
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e++
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}
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if e < len(b) {
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b1 = b[e]
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}
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if al(b0) && al(b1) {
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h.Write(space)
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}
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} else {
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starting = false
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s = e
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for e < len(b) && ws(b[e]) == false {
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e++
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}
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if e != 0 {
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b0 = b[(e - 1)]
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}
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io.WriteString(h, strings.ToLower(b[s:e]))
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}
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if e >= len(b) {
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break
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}
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}
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if len(role) != 0 {
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io.WriteString(h, role)
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}
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if vars == nil || len(vars) == 0 {
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return hex.EncodeToString(h.Sum(nil))
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}
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fields := jsn.Keys([]byte(vars))
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sort.Slice(fields, func(i, j int) bool {
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return bytes.Compare(fields[i], fields[j]) == -1
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})
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for i := range fields {
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h.Write(fields[i])
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}
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return hex.EncodeToString(h.Sum(nil))
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}
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func ws(b byte) bool {
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return b == ' ' || b == '\n' || b == '\t' || b == ','
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}
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func al(b byte) bool {
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return (b >= 'a' && b <= 'z') || (b >= 'A' && b <= 'Z') || (b >= '0' && b <= '9')
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}
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func isMutation(sql string) bool {
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for i := range sql {
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b := sql[i]
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if b == '{' {
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return false
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}
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if al(b) {
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return (b == 'm' || b == 'M')
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}
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}
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return false
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}
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func findStmt(role string, stmts []stmt) *stmt {
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for i := range stmts {
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if stmts[i].role.Name != role {
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continue
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}
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return &stmts[i]
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}
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return nil
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}
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