+/*
+==================================================================================
+ 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.
+==================================================================================
+*/
+/*
+ Mnemonic: httprestful.go
+ Abstract: HTTP Restful API NBI implementation
+ Based on Swagger generated code
+ Date: 25 March 2019
+*/
+
+package nbi
+
+import (
+ "fmt"
+ "os"
+ "time"
+ "net/url"
+ "strconv"
+ "errors"
+ "encoding/json"
+ "routing-manager/pkg/rtmgr"
+ "routing-manager/pkg/rpe"
+ "routing-manager/pkg/sdl"
+ "routing-manager/pkg/models"
+ "routing-manager/pkg/restapi"
+ "routing-manager/pkg/restapi/operations"
+ "github.com/go-openapi/runtime/middleware"
+ "routing-manager/pkg/restapi/operations/handle"
+ loads "github.com/go-openapi/loads"
+)
+
+//var myClient = &http.Client{Timeout: 1 * time.Second}
+
+type HttpRestful struct {
+ NbiEngine
+ LaunchRest LaunchRestHandler
+ RecvXappCallbackData RecvXappCallbackDataHandler
+ ProvideXappHandleHandlerImpl ProvideXappHandleHandlerImpl
+ RetrieveStartupData RetrieveStartupDataHandler
+}
+
+func NewHttpRestful() *HttpRestful {
+ instance := new(HttpRestful)
+ instance.LaunchRest = launchRest
+ instance.RecvXappCallbackData = recvXappCallbackData
+ instance.ProvideXappHandleHandlerImpl = provideXappHandleHandlerImpl
+ instance.RetrieveStartupData = retrieveStartupData
+ return instance
+}
+
+// ToDo: Use Range over channel. Read and return only the latest one.
+func recvXappCallbackData(dataChannel <-chan *models.XappCallbackData) (*[]rtmgr.XApp, error) {
+ var xappData *models.XappCallbackData
+ // Drain the channel as we are only looking for the latest value until
+ // xapp manager sends all xapp data with every request.
+ length := len(dataChannel)
+ //rtmgr.Logger.Info(length)
+ for i := 0; i <= length; i++ {
+ rtmgr.Logger.Info("data received")
+ // If no data received from the REST, it blocks.
+ xappData = <-dataChannel
+ }
+ if nil != xappData {
+ var xapps []rtmgr.XApp
+ err := json.Unmarshal([]byte(xappData.Data), &xapps)
+ return &xapps, err
+ } else {
+ rtmgr.Logger.Info("No data")
+ }
+
+ rtmgr.Logger.Debug("Nothing received on the Http interface")
+ return nil, nil
+
+}
+
+func validateXappCallbackData(callbackData *models.XappCallbackData) error {
+ if len(callbackData.Data) == 0 {
+ return fmt.Errorf("Invalid Data field: \"%s\"", callbackData.Data)
+ }
+ var xapps []rtmgr.XApp
+ err := json.Unmarshal([]byte(callbackData.Data), &xapps)
+ if err != nil {
+ return fmt.Errorf("Unmarshal failed: \"%s\"", err.Error())
+ }
+ return nil
+}
+
+func provideXappHandleHandlerImpl(datach chan<- *models.XappCallbackData, data *models.XappCallbackData) error {
+ if data != nil {
+ rtmgr.Logger.Debug("Received callback data")
+ }
+ err := validateXappCallbackData(data)
+ if err != nil {
+ rtmgr.Logger.Debug("XApp callback data validation failed: "+err.Error())
+ return err
+ } else {
+ datach<-data
+ return nil
+ }
+}
+
+func validateXappSubscriptionData(data *models.XappSubscriptionData) error {
+ var err = fmt.Errorf("XApp instance not found: %v:%v", *data.Address, *data.Port)
+ for _, ep := range rtmgr.Eps {
+ if ep.Ip == *data.Address && ep.Port == *data.Port {
+ err = nil
+ break
+ }
+ }
+ return err
+}
+
+func provideXappSubscriptionHandleImpl(subchan chan<- *models.XappSubscriptionData,
+ data *models.XappSubscriptionData) error {
+ rtmgr.Logger.Debug("Invoked provideXappSubscriptionHandleImpl")
+ err := validateXappSubscriptionData(data)
+ if err != nil {
+ rtmgr.Logger.Error(err.Error())
+ return err
+ }
+ subchan <- data
+ //var val = string(*data.Address + ":" + strconv.Itoa(int(*data.Port)))
+ rtmgr.Logger.Debug("Endpoints: %v", rtmgr.Eps)
+ return nil
+}
+
+func launchRest(nbiif *string, datach chan<- *models.XappCallbackData, subchan chan<- *models.XappSubscriptionData) {
+ swaggerSpec, err := loads.Embedded(restapi.SwaggerJSON, restapi.FlatSwaggerJSON)
+ if err != nil {
+ //log.Fatalln(err)
+ rtmgr.Logger.Error(err.Error())
+ os.Exit(1)
+ }
+ nbiUrl, err := url.Parse(*nbiif)
+ if err != nil {
+ rtmgr.Logger.Error(err.Error())
+ os.Exit(1)
+ }
+ api := operations.NewRoutingManagerAPI(swaggerSpec)
+ server := restapi.NewServer(api)
+ defer server.Shutdown()
+
+ server.Port, err = strconv.Atoi(nbiUrl.Port())
+ if err != nil {
+ rtmgr.Logger.Error("Invalid NBI RestAPI port")
+ os.Exit(1)
+ }
+ server.Host = nbiUrl.Hostname()
+ // set handlers
+ api.HandleProvideXappHandleHandler = handle.ProvideXappHandleHandlerFunc(
+ func(params handle.ProvideXappHandleParams) middleware.Responder {
+ rtmgr.Logger.Info("Data received on Http interface")
+ err := provideXappHandleHandlerImpl(datach, params.XappCallbackData)
+ if err != nil {
+ rtmgr.Logger.Error("Invalid XApp callback data: "+err.Error())
+ return handle.NewProvideXappHandleBadRequest()
+ } else {
+ return handle.NewGetHandlesOK()
+ }
+ })
+ api.HandleProvideXappSubscriptionHandleHandler = handle.ProvideXappSubscriptionHandleHandlerFunc(
+ func(params handle.ProvideXappSubscriptionHandleParams) middleware.Responder {
+ err := provideXappSubscriptionHandleImpl(subchan, params.XappSubscriptionData)
+ if err != nil {
+ return handle.NewProvideXappSubscriptionHandleBadRequest()
+ } else {
+ return handle.NewGetHandlesOK()
+ }
+ })
+ // start to serve API
+ rtmgr.Logger.Info("Starting the HTTP Rest service")
+ if err := server.Serve(); err != nil {
+ rtmgr.Logger.Error(err.Error())
+ }
+}
+
+func httpGetXapps(xmurl string) (*[]rtmgr.XApp, error) {
+ rtmgr.Logger.Info("Invoked httpgetter.fetchXappList: " + xmurl)
+ r, err := myClient.Get(xmurl)
+ if err != nil {
+ return nil, err
+ }
+ defer r.Body.Close()
+
+ if r.StatusCode == 200 {
+ rtmgr.Logger.Debug("http client raw response: %v", r)
+ var xapps []rtmgr.XApp
+ err = json.NewDecoder(r.Body).Decode(&xapps)
+ if err != nil {
+ rtmgr.Logger.Warn("Json decode failed: " + err.Error())
+ }
+ rtmgr.Logger.Info("HTTP GET: OK")
+ rtmgr.Logger.Debug("httpgetter.fetchXappList returns: %v", xapps)
+ return &xapps, err
+ }
+ rtmgr.Logger.Warn("httpgetter got an unexpected http status code: %v", r.StatusCode)
+ return nil, nil
+}
+
+func retrieveStartupData(xmurl string, nbiif string, fileName string, configfile string, sdlEngine sdl.SdlEngine) error {
+ var readErr error
+ var maxRetries = 10
+
+ for i := 1; i <= maxRetries; i++ {
+ time.Sleep(2 * time.Second)
+
+ xappData, err := httpGetXapps(xmurl)
+
+ if xappData != nil && err == nil {
+ pcData, confErr := rtmgr.GetPlatformComponents(configfile)
+ if confErr != nil {
+ rtmgr.Logger.Error(confErr.Error())
+ return confErr
+ }
+
+ rtmgr.Logger.Info("Recieved intial xapp data and platform data, writing into SDL.")
+ // Combine the xapps data and platform data before writing to the SDL
+ ricData := &rtmgr.RicComponents{Xapps: *xappData, Pcs: *pcData}
+
+ writeErr := sdlEngine.WriteAll(fileName, ricData)
+ if writeErr != nil {
+ rtmgr.Logger.Error(writeErr.Error())
+ }
+ // post subscription req to appmgr
+ readErr = PostSubReq(xmurl, nbiif)
+ if readErr == nil {
+ return nil
+ }
+ } else if err == nil {
+ readErr = errors.New("Unexpected HTTP status code")
+ } else {
+ rtmgr.Logger.Warn("cannot get xapp data due to: " + err.Error())
+ readErr = err
+ }
+ }
+ return readErr
+}
+
+func (r *HttpRestful) Initialize(xmurl string, nbiif string, fileName string, configfile string,
+ sdlEngine sdl.SdlEngine, rpeEngine rpe.RpeEngine, triggerSBI chan<- bool) error {
+ err := r.RetrieveStartupData(xmurl, nbiif, fileName, configfile, sdlEngine)
+ if err != nil {
+ rtmgr.Logger.Error("Exiting as nbi failed to get the intial startup data from the xapp manager: " + err.Error())
+ return err
+ }
+
+ datach := make(chan *models.XappCallbackData, 10)
+ subschan := make(chan *models.XappSubscriptionData, 10)
+ rtmgr.Logger.Info("Launching Rest Http service")
+ go func() {
+ r.LaunchRest(&nbiif, datach, subschan)
+ }()
+
+ go func() {
+ for {
+ data, err := r.RecvXappCallbackData(datach)
+ if err != nil {
+ rtmgr.Logger.Error("cannot get data from rest api dute to: " + err.Error())
+ } else if data != nil {
+ sdlEngine.WriteXapps(fileName, data)
+ triggerSBI <- true
+ }
+ }
+ }()
+ go func() {
+ for {
+ data := <-subschan
+ rtmgr.Logger.Debug("received XApp subscription data")
+ addSubscription(&rtmgr.Subs, data)
+ triggerSBI <- true
+ }
+ }()
+
+ return nil
+}
+
+func (r *HttpRestful) Terminate() error {
+ return nil
+}
+
+func addSubscription(subs *rtmgr.SubscriptionList, xappSubData *models.XappSubscriptionData) bool {
+ var b bool = false
+ sub := rtmgr.Subscription{SubID:*xappSubData.SubscriptionID, Fqdn:*xappSubData.Address, Port:*xappSubData.Port,}
+ for _, elem := range *subs {
+ if elem == sub {
+ rtmgr.Logger.Warn("rtmgr.addSubscription: Subscription already present: %v", elem)
+ b = true
+ }
+ }
+ if b == false {
+ *subs = append(*subs, sub)
+ }
+ return b
+}
+
Code Review / ric-plt / rtmgr.git / commitdiff