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// Copyright 2020 Envoyproxy 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 cache
import (
"context"
"errors"
"github.com/envoyproxy/go-control-plane/pkg/server/stream/v3"
)
// MuxCache multiplexes across several caches using a classification function.
// If there is no matching cache for a classification result, the cache
// responds with an empty closed channel, which effectively terminates the
// stream on the server. It might be preferred to respond with a "nil" channel
// instead which will leave the stream open in case the stream is aggregated by
// making sure there is always a matching cache.
type MuxCache struct {
// Classification functions.
Classify func(*Request) string
ClassifyDelta func(*DeltaRequest) string
// Muxed caches.
Caches map[string]Cache
}
var _ Cache = &MuxCache{}
func (mux *MuxCache) CreateWatch(request *Request, state stream.StreamState, value chan Response) func() {
key := mux.Classify(request)
cache, exists := mux.Caches[key]
if !exists {
value <- nil
return nil
}
return cache.CreateWatch(request, state, value)
}
func (mux *MuxCache) CreateDeltaWatch(request *DeltaRequest, state stream.StreamState, value chan DeltaResponse) func() {
key := mux.ClassifyDelta(request)
cache, exists := mux.Caches[key]
if !exists {
value <- nil
return nil
}
return cache.CreateDeltaWatch(request, state, value)
}
func (mux *MuxCache) Fetch(context.Context, *Request) (Response, error) {
return nil, errors.New("not implemented")
}
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