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server_listener_cache.go
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/
server_listener_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 (
"sync"
)
type ServerListenerCache struct {
mu sync.RWMutex
cache map[string]map[EndpointAddress]bool
}
func NewServerListenerCache() *ServerListenerCache {
return &ServerListenerCache{
cache: map[string]map[EndpointAddress]bool{},
}
}
// Add returns true if at least one of the new server listener addresses did not already exist in the cache
// for the provided `nodeHash` cache key.
func (c *ServerListenerCache) Add(nodeHash string, newAddresses []EndpointAddress) bool {
c.mu.Lock()
defer c.mu.Unlock()
addresses, exists := c.cache[nodeHash]
if !exists {
addresses = make(map[EndpointAddress]bool, len(newAddresses))
c.cache[nodeHash] = addresses
}
added := false
for _, address := range newAddresses {
if !addresses[address] {
addresses[address] = true
added = true
}
}
return added
}
func (c *ServerListenerCache) Get(nodeHash string) []EndpointAddress {
c.mu.RLock()
defer c.mu.RUnlock()
addresses := make([]EndpointAddress, len(c.cache[nodeHash]))
i := 0
for address := range c.cache[nodeHash] {
addresses[i] = address
i++
}
return addresses
}