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queue.go
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/
queue.go
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// Copyright 2017 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 store
import (
"github.com/gogo/protobuf/proto"
"istio.io/istio/pkg/log"
)
// The size of the buffer for the outbound channel for the queue.
const choutBufSize = 10
type eventQueue struct {
closec chan struct{}
chout chan Event
chin <-chan BackendEvent
kinds map[string]proto.Message
}
func newQueue(chin <-chan BackendEvent, kinds map[string]proto.Message) *eventQueue {
eq := &eventQueue{
closec: make(chan struct{}),
chout: make(chan Event, choutBufSize),
chin: chin,
kinds: kinds,
}
go eq.run()
return eq
}
func (q *eventQueue) convertValue(ev BackendEvent) (Event, error) {
pbSpec, err := cloneMessage(ev.Kind, q.kinds)
if err != nil {
return Event{}, err
}
if ev.Value == nil {
return Event{Key: ev.Key, Type: ev.Type}, nil
}
if err = convert(ev.Key, ev.Value.Spec, pbSpec); err != nil {
return Event{}, err
}
return Event{
Key: ev.Key,
Type: ev.Type,
Value: &Resource{
Metadata: ev.Value.Metadata,
Spec: pbSpec,
}}, nil
}
func (q *eventQueue) run() {
loop:
for {
select {
case <-q.closec:
break loop
case ev := <-q.chin:
converted, err := q.convertValue(ev)
if err != nil {
log.Errorf("Failed to convert %s an event: %v", ev.Key, err)
break
}
evs := []Event{converted}
for len(evs) > 0 {
select {
case <-q.closec:
break loop
case ev := <-q.chin:
converted, err = q.convertValue(ev)
if err != nil {
log.Errorf("Failed to convert %s an event: %v", ev.Key, err)
break
}
evs = append(evs, converted)
case q.chout <- evs[0]:
evs = evs[1:]
}
}
}
}
close(q.chout)
}