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/*
==================================================================================
Copyright (c) 2019 AT&T Intellectual Property.
Copyright (c) 2019 Nokia
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 xapp
import (
"encoding/json"
"fmt"
"github.com/go-openapi/loads"
httptransport "github.com/go-openapi/runtime/client"
"github.com/go-openapi/runtime/middleware"
"github.com/go-openapi/strfmt"
"io/ioutil"
"net/http"
"time"
apiclient "gerrit.o-ran-sc.org/r/ric-plt/xapp-frame/pkg/clientapi"
apicommon "gerrit.o-ran-sc.org/r/ric-plt/xapp-frame/pkg/clientapi/common"
apipolicy "gerrit.o-ran-sc.org/r/ric-plt/xapp-frame/pkg/clientapi/policy"
apireport "gerrit.o-ran-sc.org/r/ric-plt/xapp-frame/pkg/clientapi/report"
apimodel "gerrit.o-ran-sc.org/r/ric-plt/xapp-frame/pkg/clientmodel"
"gerrit.o-ran-sc.org/r/ric-plt/xapp-frame/pkg/models"
"gerrit.o-ran-sc.org/r/ric-plt/xapp-frame/pkg/restapi"
"gerrit.o-ran-sc.org/r/ric-plt/xapp-frame/pkg/restapi/operations"
"gerrit.o-ran-sc.org/r/ric-plt/xapp-frame/pkg/restapi/operations/common"
"gerrit.o-ran-sc.org/r/ric-plt/xapp-frame/pkg/restapi/operations/policy"
"gerrit.o-ran-sc.org/r/ric-plt/xapp-frame/pkg/restapi/operations/query"
"gerrit.o-ran-sc.org/r/ric-plt/xapp-frame/pkg/restapi/operations/report"
)
type SubscriptionHandler func(models.SubscriptionType, interface{}) (models.SubscriptionResponse, error)
type SubscriptionQueryHandler func() (models.SubscriptionList, error)
type SubscriptionDeleteHandler func(string) error
type Subscriber struct {
localAddr string
localPort int
remoteHost string
remoteUrl string
remoteProt []string
timeout time.Duration
}
func NewSubscriber(host string, timo int) *Subscriber {
if host == "" {
host = "service-ricplt-submgr-http:8088"
}
if timo == 0 {
timo = 20
}
return &Subscriber{
remoteHost: host,
remoteUrl: "/ric/v1",
remoteProt: []string{"http"},
timeout: time.Duration(timo) * time.Second,
localAddr: "0.0.0.0",
localPort: 8088,
}
}
// Server interface: listen and receive subscription requests
func (r *Subscriber) Listen(add SubscriptionHandler, get SubscriptionQueryHandler, del SubscriptionDeleteHandler) error {
swaggerSpec, err := loads.Embedded(restapi.SwaggerJSON, restapi.FlatSwaggerJSON)
if err != nil {
return err
}
api := operations.NewXappFrameworkAPI(swaggerSpec)
// Subscription: query
api.QueryGetAllSubscriptionsHandler = query.GetAllSubscriptionsHandlerFunc(
func(p query.GetAllSubscriptionsParams) middleware.Responder {
if resp, err := get(); err == nil {
return query.NewGetAllSubscriptionsOK().WithPayload(resp)
}
return query.NewGetAllSubscriptionsInternalServerError()
})
// SubscriptionType: Report
api.ReportSubscribeReportHandler = report.SubscribeReportHandlerFunc(
func(p report.SubscribeReportParams) middleware.Responder {
if resp, err := add(models.SubscriptionTypeReport, p.ReportParams); err == nil {
return report.NewSubscribeReportCreated().WithPayload(resp)
}
return report.NewSubscribeReportInternalServerError()
})
// SubscriptionType: policy
api.PolicySubscribePolicyHandler = policy.SubscribePolicyHandlerFunc(
func(p policy.SubscribePolicyParams) middleware.Responder {
if resp, err := add(models.SubscriptionTypePolicy, p.PolicyParams); err == nil {
return policy.NewSubscribePolicyCreated().WithPayload(resp)
}
return policy.NewSubscribePolicyInternalServerError()
})
// SubscriptionType: delete
api.CommonUnsubscribeHandler = common.UnsubscribeHandlerFunc(
func(p common.UnsubscribeParams) middleware.Responder {
if err := del(p.SubscriptionID); err == nil {
return common.NewUnsubscribeNoContent()
}
return common.NewUnsubscribeInternalServerError()
})
server := restapi.NewServer(api)
defer server.Shutdown()
server.Host = r.localAddr
server.Port = r.localPort
Logger.Info("Serving subscriptions on %s:%d\n", server.Host, server.Port)
if err := server.Serve(); err != nil {
return err
}
return nil
}
// Subscription interface for xApp: REPORT
func (r *Subscriber) SubscribeReport(p *apimodel.ReportParams) (apimodel.SubscriptionResponse, error) {
params := apireport.NewSubscribeReportParamsWithTimeout(r.timeout).WithReportParams(p)
result, err := r.CreateTransport().Report.SubscribeReport(params)
if err != nil {
return apimodel.SubscriptionResponse{}, err
}
return result.Payload, err
}
// Subscription interface for xApp: POLICY
func (r *Subscriber) SubscribePolicy(p *apimodel.PolicyParams) (apimodel.SubscriptionResponse, error) {
params := apipolicy.NewSubscribePolicyParamsWithTimeout(r.timeout).WithPolicyParams(p)
result, err := r.CreateTransport().Policy.SubscribePolicy(params)
if err != nil {
return apimodel.SubscriptionResponse{}, err
}
return result.Payload, err
}
// Subscription interface for xApp: DELETE
func (r *Subscriber) UnSubscribe(subId string) error {
params := apicommon.NewUnsubscribeParamsWithTimeout(r.timeout).WithSubscriptionID(subId)
_, err := r.CreateTransport().Common.Unsubscribe(params)
return err
}
// Subscription interface for xApp: QUERY
func (r *Subscriber) QuerySubscriptions() (models.SubscriptionList, error) {
resp, err := http.Get(fmt.Sprintf("http://%s/%s/subscriptions", r.remoteHost, r.remoteUrl))
if err != nil {
return models.SubscriptionList{}, err
}
defer resp.Body.Close()
contents, err := ioutil.ReadAll(resp.Body)
if err != nil {
return models.SubscriptionList{}, err
}
subscriptions := models.SubscriptionList{}
err = json.Unmarshal([]byte(string(contents)), &subscriptions)
if err != nil {
return models.SubscriptionList{}, err
}
return subscriptions, nil
}
func (r *Subscriber) CreateTransport() *apiclient.RICSubscription {
return apiclient.New(httptransport.New(r.remoteHost, r.remoteUrl, r.remoteProt), strfmt.Default)
}