/
location_resolver.go
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/
location_resolver.go
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/*
Copyright 2018 The Kubernetes 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 endpoints
import (
"encoding/json"
"k8s.io/autoscaler/cluster-autoscaler/cloudprovider/alicloud/alibaba-cloud-sdk-go/sdk/requests"
"sync"
"time"
)
const (
// EndpointCacheExpireTime in seconds
EndpointCacheExpireTime = 3600
)
var lastClearTimePerProduct = struct {
sync.RWMutex
cache map[string]int64
}{cache: make(map[string]int64)}
var endpointCache = struct {
sync.RWMutex
cache map[string]string
}{cache: make(map[string]string)}
// LocationResolver is kind of resolver
type LocationResolver struct{}
// TryResolve return endpoint
func (resolver *LocationResolver) TryResolve(param *ResolveParam) (endpoint string, support bool, err error) {
if len(param.LocationProduct) <= 0 {
support = false
return
}
//get from cache
cacheKey := param.Product + "#" + param.RegionId
if endpointCache.cache != nil && len(endpointCache.cache[cacheKey]) > 0 && !CheckCacheIsExpire(cacheKey) {
endpoint = endpointCache.cache[cacheKey]
support = true
return
}
//get from remote
getEndpointRequest := requests.NewCommonRequest()
getEndpointRequest.Product = "Location"
getEndpointRequest.Version = "2015-06-12"
getEndpointRequest.ApiName = "DescribeEndpoints"
getEndpointRequest.Domain = "location.aliyuncs.com"
getEndpointRequest.Method = "GET"
getEndpointRequest.Scheme = requests.HTTPS
getEndpointRequest.QueryParams["Id"] = param.RegionId
getEndpointRequest.QueryParams["ServiceCode"] = param.LocationProduct
if len(param.LocationEndpointType) > 0 {
getEndpointRequest.QueryParams["Type"] = param.LocationEndpointType
} else {
getEndpointRequest.QueryParams["Type"] = "openAPI"
}
response, err := param.CommonApi(getEndpointRequest)
var getEndpointResponse GetEndpointResponse
if !response.IsSuccess() {
support = false
return
}
json.Unmarshal([]byte(response.GetHttpContentString()), &getEndpointResponse)
if !getEndpointResponse.Success || getEndpointResponse.Endpoints == nil {
support = false
return
}
if len(getEndpointResponse.Endpoints.Endpoint) <= 0 {
support = false
return
}
if len(getEndpointResponse.Endpoints.Endpoint[0].Endpoint) > 0 {
endpoint = getEndpointResponse.Endpoints.Endpoint[0].Endpoint
endpointCache.Lock()
endpointCache.cache[cacheKey] = endpoint
endpointCache.Unlock()
lastClearTimePerProduct.Lock()
lastClearTimePerProduct.cache[cacheKey] = time.Now().Unix()
lastClearTimePerProduct.Unlock()
support = true
return
}
support = false
return
}
// CheckCacheIsExpire valid the cacheKey
func CheckCacheIsExpire(cacheKey string) bool {
lastClearTime := lastClearTimePerProduct.cache[cacheKey]
if lastClearTime <= 0 {
lastClearTime = time.Now().Unix()
lastClearTimePerProduct.Lock()
lastClearTimePerProduct.cache[cacheKey] = lastClearTime
lastClearTimePerProduct.Unlock()
}
now := time.Now().Unix()
elapsedTime := now - lastClearTime
if elapsedTime > EndpointCacheExpireTime {
return true
}
return false
}
// GetEndpointResponse returns Endpoints
type GetEndpointResponse struct {
Endpoints *EndpointsObj
RequestId string
Success bool
}
// EndpointsObj wrapper Endpoint array
type EndpointsObj struct {
Endpoint []EndpointObj
}
// EndpointObj wrapper endpoint
type EndpointObj struct {
Protocols map[string]string
Type string
Namespace string
Id string
ServiceCode string
Endpoint string
}