smruthi2187andGitHub
8014c83b02
The router's cache entry for a function might become stale if the pod that had the function specialized gets deleted somehow. In such a case, we'd retry getting a new service for the function from executor and retry forwarding the user request to the newly created service.
83 lines
2.0 KiB
Go
83 lines
2.0 KiB
Go
/*
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Copyright 2016 The Fission 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 router
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import (
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"log"
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"net/url"
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"time"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"github.com/fission/fission/cache"
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)
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type (
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functionServiceMap struct {
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cache *cache.Cache // map[metadataKey]*url.URL
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}
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// metav1.ObjectMeta is not hashable, so we make a hashable copy
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// of the subset of its fields that are identifiable.
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metadataKey struct {
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Name string
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Namespace string
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ResourceVersion string
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}
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)
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func makeFunctionServiceMap(expiry time.Duration) *functionServiceMap {
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return &functionServiceMap{
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cache: cache.MakeCache(expiry, 0),
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}
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}
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func keyFromMetadata(m *metav1.ObjectMeta) *metadataKey {
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return &metadataKey{
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Name: m.Name,
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Namespace: m.Namespace,
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ResourceVersion: m.ResourceVersion,
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}
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}
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func (fmap *functionServiceMap) lookup(f *metav1.ObjectMeta) (*url.URL, error) {
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mk := keyFromMetadata(f)
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item, err := fmap.cache.Get(*mk)
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if err != nil {
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return nil, err
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}
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u := item.(*url.URL)
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return u, nil
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}
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func (fmap *functionServiceMap) assign(f *metav1.ObjectMeta, serviceUrl *url.URL) {
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mk := keyFromMetadata(f)
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err, old := fmap.cache.Set(*mk, serviceUrl)
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if err != nil {
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if *serviceUrl == *(old.(*url.URL)) {
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return
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}
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log.Printf("error caching service url for function with a different value: %v", err)
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// ignore error
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}
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}
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func (fmap *functionServiceMap) remove(f *metav1.ObjectMeta) error {
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mk := keyFromMetadata(f)
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return fmap.cache.Delete(*mk)
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}
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