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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 runtime
import (
"fmt"
"sync"
"github.com/gogo/protobuf/proto"
"istio.io/istio/galley/pkg/runtime/resource"
)
// Source to be implemented by a source configuration provider.
type Source interface {
// Start the source interface, provided the EventHandler. The initial state of the underlying
// config store should be reflected as a series of Added events, followed by a FullSync event.
Start(handler resource.EventHandler) error
// Stop the source interface. Upon return from this method, the channel should not be accumulating any
// more events.
Stop()
}
// InMemorySource is an implementation of source.Interface.
type InMemorySource struct {
stateLock sync.Mutex
items map[resource.Key]resource.Entry
handler resource.EventHandler
versionCtr int64
}
var _ Source = &InMemorySource{}
// NewInMemorySource returns a new instance of InMemorySource.
func NewInMemorySource() *InMemorySource {
return &InMemorySource{
items: make(map[resource.Key]resource.Entry),
versionCtr: 1,
}
}
// Start implements source.Interface.Start
func (s *InMemorySource) Start(handler resource.EventHandler) error {
s.stateLock.Lock()
defer s.stateLock.Unlock()
if s.handler != nil {
return fmt.Errorf("already started")
}
s.handler = handler
// publish current items
for _, item := range s.items {
s.handler(resource.Event{Kind: resource.Added, Entry: resource.Entry{
ID: item.ID,
Metadata: item.Metadata,
Item: item.Item,
}})
}
s.handler(resource.FullSyncEvent)
return nil
}
// Stop implements source.Interface.Stop
func (s *InMemorySource) Stop() {
s.stateLock.Lock()
defer s.stateLock.Unlock()
s.handler = nil
}
// Set the value in the in-memory store.
func (s *InMemorySource) Set(k resource.Key, metadata resource.Metadata, item proto.Message) {
s.stateLock.Lock()
defer s.stateLock.Unlock()
_, found := s.items[k]
v := s.nextVersion()
s.items[k] = resource.Entry{ID: resource.VersionedKey{Key: k, Version: v}, Item: item}
kind := resource.Added
if found {
kind = resource.Updated
}
if s.handler != nil {
s.handler(resource.Event{Kind: kind, Entry: resource.Entry{
ID: resource.VersionedKey{Key: k, Version: v},
Metadata: metadata,
Item: item,
}})
}
}
// Delete a value in the in-memory store.
func (s *InMemorySource) Delete(k resource.Key) {
s.stateLock.Lock()
defer s.stateLock.Unlock()
_, found := s.items[k]
if !found {
return
}
v := s.nextVersion()
delete(s.items, k)
s.handler(resource.Event{
Kind: resource.Deleted,
Entry: resource.Entry{
ID: resource.VersionedKey{
Key: k,
Version: v,
},
},
})
}
// Get a value in the in-memory store.
func (s *InMemorySource) Get(key resource.Key) (resource.Entry, error) {
s.stateLock.Lock()
defer s.stateLock.Unlock()
r := s.items[key]
return r, nil
}
func (s *InMemorySource) nextVersion() resource.Version {
v := s.versionCtr
s.versionCtr++
return resource.Version(fmt.Sprintf("v%d", v))
}