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source.go
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source.go
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// Copyright 2018 Istio 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 dynamic
import (
"fmt"
"sync"
"time"
"istio.io/istio/galley/pkg/runtime"
"istio.io/istio/galley/pkg/runtime/resource"
"istio.io/istio/galley/pkg/source/kube/dynamic/converter"
"istio.io/istio/galley/pkg/source/kube/log"
sourceSchema "istio.io/istio/galley/pkg/source/kube/schema"
"istio.io/istio/galley/pkg/source/kube/stats"
"istio.io/istio/galley/pkg/source/kube/tombstone"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
k8sRuntime "k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/watch"
"k8s.io/client-go/dynamic"
"k8s.io/client-go/tools/cache"
)
var _ runtime.Source = &source{}
// source is a simplified client interface for listening/getting Kubernetes resources in an unstructured way.
type source struct {
// Lock for changing the running state of the source
stateLock sync.Mutex
cfg *converter.Config
spec sourceSchema.ResourceSpec
resyncPeriod time.Duration
// The dynamic resource interface for accessing custom resources dynamically.
resourceClient dynamic.ResourceInterface
// stopCh is used to quiesce the background activity during shutdown
stopCh chan struct{}
// SharedIndexInformer for watching/caching resources
informer cache.SharedIndexInformer
handler resource.EventHandler
}
// New returns a new instance of a dynamic source for the given schema.
func New(
client dynamic.Interface, resyncPeriod time.Duration, spec sourceSchema.ResourceSpec,
cfg *converter.Config) (runtime.Source, error) {
gv := spec.GroupVersion()
log.Scope.Debugf("Creating a new dynamic resource source for: name='%s', gv:'%v'",
spec.Singular, gv)
resourceClient := client.Resource(gv.WithResource(spec.Plural))
return &source{
spec: spec,
cfg: cfg,
resyncPeriod: resyncPeriod,
resourceClient: resourceClient,
}, nil
}
// Start the source. This will commence listening and dispatching of events.
func (s *source) Start(handler resource.EventHandler) error {
s.stateLock.Lock()
defer s.stateLock.Unlock()
if s.stopCh != nil {
return fmt.Errorf("already synchronizing resources: name='%s', gv='%v'",
s.spec.Singular, s.spec.GroupVersion())
}
if handler == nil {
return fmt.Errorf("invalid event handler")
}
log.Scope.Debugf("Starting source for %s(%v)", s.spec.Singular, s.spec.GroupVersion())
s.stopCh = make(chan struct{})
s.handler = handler
s.informer = cache.NewSharedIndexInformer(
&cache.ListWatch{
ListFunc: func(options metav1.ListOptions) (k8sRuntime.Object, error) {
return s.resourceClient.List(options)
},
WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) {
options.Watch = true
return s.resourceClient.Watch(options)
},
},
&unstructured.Unstructured{},
s.resyncPeriod,
cache.Indexers{})
s.informer.AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: func(obj interface{}) { s.handleEvent(resource.Added, obj) },
UpdateFunc: func(old, new interface{}) {
newRes := new.(*unstructured.Unstructured)
oldRes := old.(*unstructured.Unstructured)
if newRes.GetResourceVersion() == oldRes.GetResourceVersion() {
// Periodic resync will send update events for all known resources.
// Two different versions of the same resource will always have different RVs.
return
}
s.handleEvent(resource.Updated, new)
},
DeleteFunc: func(obj interface{}) { s.handleEvent(resource.Deleted, obj) },
})
// Start CRD shared informer background process.
go s.informer.Run(s.stopCh)
// Send the an event after the cache syncs.
go func() {
_ = cache.WaitForCacheSync(s.stopCh, s.informer.HasSynced)
handler(resource.FullSyncEvent)
}()
return nil
}
// Stop the source. This will stop publishing of events.
func (s *source) Stop() {
s.stateLock.Lock()
defer s.stateLock.Unlock()
if s.stopCh == nil {
log.Scope.Errorf("already stopped")
return
}
close(s.stopCh)
s.stopCh = nil
}
func (s *source) handleEvent(c resource.EventKind, obj interface{}) {
object, ok := obj.(metav1.Object)
if !ok {
if object = tombstone.RecoverResource(obj); object != nil {
// Tombstone recovery failed.
return
}
}
var u *unstructured.Unstructured
if uns, ok := obj.(*unstructured.Unstructured); ok {
u = uns
// https://github.com/kubernetes/kubernetes/pull/63972
// k8s machinery does not always preserve TypeMeta in list operations. Restore it
// using aprior knowledge of the GVK for this source.
u.SetGroupVersionKind(schema.GroupVersionKind{
Group: s.spec.Group,
Version: s.spec.Version,
Kind: s.spec.Kind,
})
}
log.Scope.Debugf("Sending event: [%v] from: %s", c, s.spec.CanonicalResourceName())
key := resource.FullNameFromNamespaceAndName(object.GetNamespace(), object.GetName())
processEvent(s.cfg, s.spec, c, key, object.GetResourceVersion(), u, s.handler)
stats.RecordEventSuccess()
}
// ConvertAndLog is a utility that invokes the converter and logs the success status.
func ConvertAndLog(cfg *converter.Config, spec sourceSchema.ResourceSpec, key resource.FullName,
resourceVersion string, u *unstructured.Unstructured) ([]converter.Entry, error) {
entries, err := spec.Converter(cfg, spec.Target, key, spec.Kind, u)
if err != nil {
log.Scope.Errorf("Unable to convert unstructured to proto: %s/%s: %v", key, resourceVersion, err)
stats.RecordConverterResult(false, spec.Version, spec.Group, spec.Kind)
return nil, err
}
stats.RecordConverterResult(true, spec.Version, spec.Group, spec.Kind)
return entries, nil
}
// processEvent process the incoming message and convert it to event
func processEvent(cfg *converter.Config, spec sourceSchema.ResourceSpec, kind resource.EventKind, key resource.FullName,
resourceVersion string, u *unstructured.Unstructured, handler resource.EventHandler) {
entries, err := ConvertAndLog(cfg, spec, key, resourceVersion, u)
if err != nil {
return
}
if len(entries) == 0 {
log.Scope.Debugf("Did not receive any entries from converter: kind=%v, key=%v, rv=%s",
kind, key, resourceVersion)
return
}
// TODO(nmittler): Will there ever be > 1 entries?
entry := entries[0]
var event resource.Event
switch kind {
case resource.Added, resource.Updated:
event = resource.Event{
Kind: kind,
Entry: resource.Entry{
ID: resource.VersionedKey{
Key: resource.Key{
Collection: spec.Target.Collection,
FullName: entry.Key,
},
Version: resource.Version(resourceVersion),
},
Item: entry.Resource,
Metadata: entry.Metadata,
},
}
case resource.Deleted:
event = resource.Event{
Kind: kind,
Entry: resource.Entry{
ID: resource.VersionedKey{
Key: resource.Key{
Collection: spec.Target.Collection,
FullName: entry.Key,
},
Version: resource.Version(resourceVersion),
},
},
}
}
log.Scope.Debugf("Dispatching source event: %v", event)
handler(event)
}