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controller.go
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controller.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 memory
import (
"errors"
"istio.io/istio/pilot/pkg/model"
)
type controller struct {
monitor Monitor
configStore model.ConfigStore
}
// NewController return an implementation of model.ConfigStoreCache
// This is a client-side monitor that dispatches events as the changes are being
// made on the client.
func NewController(cs model.ConfigStore) model.ConfigStoreCache {
out := &controller{
configStore: cs,
monitor: NewMonitor(cs),
}
return out
}
// NewBufferedController return an implementation of model.ConfigStoreCache. This differs from NewController in that it
// allows for specifying the size of the internal event buffer.
func NewBufferedController(cs model.ConfigStore, bufferSize int) model.ConfigStoreCache {
out := &controller{
configStore: cs,
monitor: NewBufferedMonitor(cs, bufferSize),
}
return out
}
func (c *controller) RegisterEventHandler(typ string, f func(model.Config, model.Event)) {
c.monitor.AppendEventHandler(typ, f)
}
// Memory implementation is always synchronized with cache
func (c *controller) HasSynced() bool {
return true
}
func (c *controller) Run(stop <-chan struct{}) {
c.monitor.Run(stop)
}
func (c *controller) ConfigDescriptor() model.ConfigDescriptor {
return c.configStore.ConfigDescriptor()
}
func (c *controller) Get(typ, key, namespace string) *model.Config {
return c.configStore.Get(typ, key, namespace)
}
func (c *controller) Create(config model.Config) (revision string, err error) {
if revision, err = c.configStore.Create(config); err == nil {
c.monitor.ScheduleProcessEvent(ConfigEvent{
config: config,
event: model.EventAdd,
})
}
return
}
func (c *controller) Update(config model.Config) (newRevision string, err error) {
if newRevision, err = c.configStore.Update(config); err == nil {
c.monitor.ScheduleProcessEvent(ConfigEvent{
config: config,
event: model.EventUpdate,
})
}
return
}
func (c *controller) Delete(typ, key, namespace string) (err error) {
if config := c.Get(typ, key, namespace); config != nil {
if err = c.configStore.Delete(typ, key, namespace); err == nil {
c.monitor.ScheduleProcessEvent(ConfigEvent{
config: *config,
event: model.EventDelete,
})
return
}
}
return errors.New("Delete failure: config" + key + "does not exist")
}
func (c *controller) List(typ, namespace string) ([]model.Config, error) {
return c.configStore.List(typ, namespace)
}