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grpc_application_cache.go
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grpc_application_cache.go
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// Copyright 2023 Google LLC
//
// 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 xds
import (
"fmt"
"slices"
"sync"
)
// The GRPCApplicationCache key is `<kubecontext>/<namespace>`.
type GRPCApplicationCache struct {
mu sync.RWMutex
cache map[string][]GRPCApplication
}
func NewGRPCApplicationCache() *GRPCApplicationCache {
return &GRPCApplicationCache{
cache: map[string][]GRPCApplication{},
}
}
// Put returns true iff the update changed the cache.
// Use the return value to avoid sending xDS updates to clients when nothing has changed.
func (c *GRPCApplicationCache) Put(kubecontextName string, namespace string, apps []GRPCApplication) bool {
if apps == nil {
apps = []GRPCApplication{}
}
slices.SortFunc(apps, func(a GRPCApplication, b GRPCApplication) int {
return a.Compare(b)
})
c.mu.Lock()
defer c.mu.Unlock()
key := key(kubecontextName, namespace)
oldApps := c.cache[key]
c.cache[key] = apps
return !slices.EqualFunc(oldApps, apps, func(a GRPCApplication, b GRPCApplication) bool {
return a.Equal(b)
})
}
func (c *GRPCApplicationCache) Get(kubecontextName string, namespace string) []GRPCApplication {
c.mu.RLock()
defer c.mu.RUnlock()
return c.cache[key(kubecontextName, namespace)]
}
func (c *GRPCApplicationCache) GetAll() []GRPCApplication {
apps := []GRPCApplication{}
c.mu.RLock()
defer c.mu.RUnlock()
for _, appsForKey := range c.cache {
apps = append(apps, appsForKey...)
}
return apps
}
func key(kubecontextName string, namespace string) string {
return fmt.Sprintf("%s/%s", kubecontextName, namespace)
}