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fab942f486
The controller will retrieve all the endpoints at the beginning of its loop. When changes need to be applied, the provider may need to query the endpoints again. Allow the provider to skip the queries if its data was cached.
53 lines
1.5 KiB
Go
53 lines
1.5 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package provider
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import (
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"context"
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"net"
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"strings"
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"github.com/kubernetes-incubator/external-dns/endpoint"
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"github.com/kubernetes-incubator/external-dns/plan"
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)
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// Provider defines the interface DNS providers should implement.
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type Provider interface {
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Records() ([]*endpoint.Endpoint, error)
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ApplyChanges(ctx context.Context, changes *plan.Changes) error
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}
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type contextKey struct {
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name string
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}
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func (k *contextKey) String() string { return "provider context value " + k.name }
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// RecordsContextKey is a context key. It can be used during ApplyChanges
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// to access previously cached records. The associated value will be of
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// type []*endpoint.Endpoint.
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var RecordsContextKey = &contextKey{"records"}
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// ensureTrailingDot ensures that the hostname receives a trailing dot if it hasn't already.
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func ensureTrailingDot(hostname string) string {
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if net.ParseIP(hostname) != nil {
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return hostname
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}
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return strings.TrimSuffix(hostname, ".") + "."
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}
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