ef03b1e3df
Upgrade dependent version: github.com/open-policy-agent/opa v0.18.0 -> v0.45.0 Signed-off-by: hongzhouzi <hongzhouzi@kubesphere.io> Signed-off-by: hongzhouzi <hongzhouzi@kubesphere.io>
100 lines
2.0 KiB
Go
100 lines
2.0 KiB
Go
// Copyright 2020 The OPA Authors. All rights reserved.
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// Use of this source code is governed by an Apache2
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// license that can be found in the LICENSE file.
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package topdown
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import (
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"fmt"
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"math/big"
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"github.com/open-policy-agent/opa/ast"
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"github.com/open-policy-agent/opa/topdown/builtins"
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)
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type randIntCachingKey string
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var one = big.NewInt(1)
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func builtinNumbersRange(bctx BuiltinContext, operands []*ast.Term, iter func(*ast.Term) error) error {
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x, err := builtins.BigIntOperand(operands[0].Value, 1)
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if err != nil {
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return err
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}
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y, err := builtins.BigIntOperand(operands[1].Value, 2)
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if err != nil {
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return err
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}
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result := ast.NewArray()
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cmp := x.Cmp(y)
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haltErr := Halt{
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Err: &Error{
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Code: CancelErr,
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Message: "numbers.range: timed out before generating all numbers in range",
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},
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}
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if cmp <= 0 {
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for i := new(big.Int).Set(x); i.Cmp(y) <= 0; i = i.Add(i, one) {
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if bctx.Cancel != nil && bctx.Cancel.Cancelled() {
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return haltErr
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}
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result = result.Append(ast.NewTerm(builtins.IntToNumber(i)))
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}
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} else {
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for i := new(big.Int).Set(x); i.Cmp(y) >= 0; i = i.Sub(i, one) {
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if bctx.Cancel != nil && bctx.Cancel.Cancelled() {
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return haltErr
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}
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result = result.Append(ast.NewTerm(builtins.IntToNumber(i)))
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}
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}
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return iter(ast.NewTerm(result))
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}
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func builtinRandIntn(bctx BuiltinContext, args []*ast.Term, iter func(*ast.Term) error) error {
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strOp, err := builtins.StringOperand(args[0].Value, 1)
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if err != nil {
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return err
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}
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n, err := builtins.IntOperand(args[1].Value, 2)
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if err != nil {
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return err
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}
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if n == 0 {
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return iter(ast.IntNumberTerm(0))
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}
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if n < 0 {
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n = -n
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}
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var key = randIntCachingKey(fmt.Sprintf("%s-%d", strOp, n))
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if val, ok := bctx.Cache.Get(key); ok {
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return iter(val.(*ast.Term))
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}
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r, err := bctx.Rand()
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if err != nil {
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return err
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}
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result := ast.IntNumberTerm(r.Intn(n))
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bctx.Cache.Put(key, result)
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return iter(result)
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}
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func init() {
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RegisterBuiltinFunc(ast.NumbersRange.Name, builtinNumbersRange)
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RegisterBuiltinFunc(ast.RandIntn.Name, builtinRandIntn)
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}
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