/
ttl.go
50 lines (44 loc) · 1.77 KB
/
ttl.go
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/*
* Copyright 2019 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 broker
import (
cloudevents "github.com/cloudevents/sdk-go"
cetypes "github.com/cloudevents/sdk-go/pkg/cloudevents/types"
)
const (
// TTLAttribute is the name of the CloudEvents extension attribute used to store the
// Broker's TTL (number of times a single event can reply through a Broker continuously). All
// interactions with the attribute should be done through the GetTTL and SetTTL functions.
TTLAttribute = "knativebrokerttl"
)
// GetTTL finds the TTL in the EventContext using a case insensitive comparison
// for the key. The second return param, is the case preserved key that matched.
// Depending on the encoding/transport, the extension case could be changed.
func GetTTL(ctx cloudevents.EventContext) (int32, error) {
ttl, err := ctx.GetExtension(TTLAttribute)
if err != nil {
return 0, err
}
return cetypes.ToInteger(ttl)
}
// SetTTL sets the TTL into the EventContext. ttl should be a positive integer.
func SetTTL(ctx cloudevents.EventContext, ttl int32) error {
return ctx.SetExtension(TTLAttribute, ttl)
}
// DeleteTTL removes the TTL CE extension attribute
func DeleteTTL(ctx cloudevents.EventContext) error {
return ctx.SetExtension(TTLAttribute, nil)
}