/
availableservers.go
86 lines (70 loc) · 2.34 KB
/
availableservers.go
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package availableservers
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*
*/
import (
"errors"
"fmt"
"sync"
"github.com/apache/trafficcontrol/lib/go-tc"
)
type AvailableServersMap map[tc.DeliveryServiceName]map[tc.CacheGroupName][]tc.CacheName
// AvailableServers provides access to the currently available servers, by Delivery Service and Cache Group. This is safe for access by multiple goroutines.
type AvailableServers struct {
p **AvailableServersMap
m *sync.RWMutex
}
func New() AvailableServers {
mp := &AvailableServersMap{}
return AvailableServers{p: &mp, m: &sync.RWMutex{}}
}
func (a *AvailableServers) Get(ds tc.DeliveryServiceName, cg tc.CacheGroupName) ([]tc.CacheName, error) {
a.m.RLock()
s := *a.p
a.m.RUnlock()
cgs, ok := (*s)[ds]
if !ok {
return nil, errors.New("deliveryservice not found")
}
cs, ok := cgs[cg]
if !ok {
return nil, errors.New("cachegroup not found")
}
return cs, nil
}
func (a *AvailableServers) Set(m AvailableServersMap) {
a.m.Lock()
defer a.m.Unlock()
*a.p = &m
}
// TODO put in _test.go file
func Test() {
a := New()
as := map[tc.DeliveryServiceName]map[tc.CacheGroupName][]tc.CacheName{}
as[tc.DeliveryServiceName("dsOne")] = map[tc.CacheGroupName][]tc.CacheName{}
cs := as[tc.DeliveryServiceName("dsOne")]
cs[tc.CacheGroupName("cgOne")] = []tc.CacheName{"cacheOne", "cacheTwo"}
fmt.Printf("testAvailableServers as %+v\n", as)
a.Set(as)
newCs, err := a.Get(tc.DeliveryServiceName("dsOne"), tc.CacheGroupName("cgOne"))
if err != nil {
fmt.Println("testAvailableServers err ", err.Error())
}
fmt.Println("testAvailableServers caches ", newCs)
}