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eval_bool.go
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/
eval_bool.go
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/*
Copyright 2022 The Numaproj Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package expr
import (
"encoding/json"
"fmt"
"strconv"
"github.com/Masterminds/sprig/v3"
"github.com/antonmedv/expr"
)
var sprigFuncMap = sprig.GenericFuncMap()
const root = "payload"
func EvalBool(expression string, msg []byte) (bool, error) {
msgMap := map[string]interface{}{
root: string(msg),
}
env := getFuncMap(msgMap)
result, err := expr.Eval(expression, env)
if err != nil {
return false, fmt.Errorf("unable to evaluate expression '%s': %s", expression, err)
}
resultBool, ok := result.(bool)
if !ok {
return false, fmt.Errorf("unable to cast expression result '%s' to bool", result)
}
return resultBool, nil
}
func getFuncMap(m map[string]interface{}) map[string]interface{} {
env := Expand(m)
env["sprig"] = sprigFuncMap
env["json"] = _json
env["int"] = _int
env["string"] = _string
return env
}
func _int(v interface{}) int {
switch w := v.(type) {
case []byte:
i, err := strconv.Atoi(string(w))
if err != nil {
panic(fmt.Errorf("cannot convert %q an int", v))
}
return i
case string:
i, err := strconv.Atoi(w)
if err != nil {
panic(fmt.Errorf("cannot convert %q to int", v))
}
return i
case float64:
return int(w)
case int:
return w
default:
panic(fmt.Errorf("cannot convert %q to int", v))
}
}
func _string(v interface{}) string {
switch w := v.(type) {
case nil:
return ""
case []byte:
return string(w)
default:
return fmt.Sprintf("%v", v)
}
}
func _json(v interface{}) map[string]interface{} {
x := make(map[string]interface{})
switch w := v.(type) {
case nil:
return nil
case []byte:
if err := json.Unmarshal(w, &x); err != nil {
panic(fmt.Errorf("cannot convert %q to object: %v", v, err))
}
return x
case string:
if err := json.Unmarshal([]byte(w), &x); err != nil {
panic(fmt.Errorf("cannot convert %q to object: %v", v, err))
}
return x
default:
panic("unknown type")
}
}