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filter.go
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/
filter.go
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/*
Copyright 2020 The Knative 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 eventfilter
import (
"context"
cloudevents "github.com/cloudevents/sdk-go/v2"
)
const (
PassFilter FilterResult = "pass"
FailFilter FilterResult = "fail"
NoFilter FilterResult = "no_filter"
)
// FilterResult has the result of the filtering operation.
type FilterResult string
func (x FilterResult) And(y FilterResult) FilterResult {
if x == NoFilter {
return y
}
if y == NoFilter {
return x
}
if x == PassFilter && y == PassFilter {
return PassFilter
}
return FailFilter
}
func (x FilterResult) Or(y FilterResult) FilterResult {
if x == NoFilter {
return y
}
if y == NoFilter {
return x
}
if x == PassFilter || y == PassFilter {
return PassFilter
}
return FailFilter
}
// Filter is an interface representing an event filter of the trigger filter
type Filter interface {
// Filter compute the predicate on the provided event and returns the result of the matching
Filter(ctx context.Context, event cloudevents.Event) FilterResult
}