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time.go
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time.go
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// Copyright 2017 The OPA Authors. All rights reserved.
// Use of this source code is governed by an Apache2
// license that can be found in the LICENSE file.
package topdown
import (
"encoding/json"
"strconv"
"time"
"github.com/open-policy-agent/opa/ast"
"github.com/open-policy-agent/opa/topdown/builtins"
)
type nowKeyID string
var nowKey = nowKeyID("time.now_ns")
func builtinTimeParseNanos(a, b ast.Value) (ast.Value, error) {
format, err := builtins.StringOperand(a, 1)
if err != nil {
return nil, err
}
value, err := builtins.StringOperand(b, 2)
if err != nil {
return nil, err
}
result, err := time.Parse(string(format), string(value))
if err != nil {
return nil, err
}
return ast.Number(int64ToJSONNumber(result.UnixNano())), nil
}
func builtinTimeParseRFC3339Nanos(a ast.Value) (ast.Value, error) {
value, err := builtins.StringOperand(a, 1)
if err != nil {
return nil, err
}
result, err := time.Parse(time.RFC3339, string(value))
if err != nil {
return nil, err
}
return ast.Number(int64ToJSONNumber(result.UnixNano())), nil
}
func builtinTimeNowNanos(t *Topdown, expr *ast.Expr, iter Iterator) error {
operands := expr.Terms.([]*ast.Term)
var now ast.Number
exist, ok := t.builtins.Get(nowKey)
if !ok {
curr := time.Now()
now = ast.Number(int64ToJSONNumber(curr.UnixNano()))
t.builtins.Put(nowKey, now)
} else {
now = exist.(ast.Number)
}
return unifyAndContinue(t, iter, now, operands[1].Value)
}
func int64ToJSONNumber(i int64) json.Number {
return json.Number(strconv.FormatInt(i, 10))
}
func init() {
RegisterFunctionalBuiltin1(ast.ParseRFC3339Nanos.Name, builtinTimeParseRFC3339Nanos)
RegisterFunctionalBuiltin2(ast.ParseNanos.Name, builtinTimeParseNanos)
RegisterBuiltinFunc(ast.NowNanos.Name, builtinTimeNowNanos)
}