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rule_evaluator.go
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rule_evaluator.go
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// Copyright 2024 The Bucketeer 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 evaluation
import (
featureproto "github.com/bucketeer-io/bucketeer/proto/feature"
userproto "github.com/bucketeer-io/bucketeer/proto/user"
)
type ruleEvaluator struct {
clauseEvaluator
}
func (e *ruleEvaluator) Evaluate(
rules []*featureproto.Rule,
user *userproto.User,
segmentUsers []*featureproto.SegmentUser,
) *featureproto.Rule {
for _, rule := range rules {
if e.evaluateRule(rule, user, segmentUsers) {
return rule
}
}
return nil
}
func (e *ruleEvaluator) evaluateRule(
rule *featureproto.Rule,
user *userproto.User,
segmentUsers []*featureproto.SegmentUser,
) bool {
for _, clause := range rule.Clauses {
if !e.evaluateClause(clause, user, segmentUsers) {
return false
}
}
return true
}
func (e *ruleEvaluator) evaluateClause(
clause *featureproto.Clause,
user *userproto.User,
segmentUsers []*featureproto.SegmentUser,
) bool {
var targetAttr string
if clause.Attribute == "id" {
targetAttr = user.Id
} else {
targetAttr = user.Data[clause.Attribute]
}
return e.clauseEvaluator.Evaluate(targetAttr, clause, user.Id, segmentUsers)
}