cmd/vesmgr/subscribexAPPNotifications.go

   1 /*
   2  *  Copyright (c) 2019 AT&T Intellectual Property.
   3  *  Copyright (c) 2018-2019 Nokia.
   4  *
   5  *  Licensed under the Apache License, Version 2.0 (the "License");
   6  *  you may not use this file except in compliance with the License.
   7  *  You may obtain a copy of the License at
   8  *
   9  *     http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  *  Unless required by applicable law or agreed to in writing, software
  12  *  distributed under the License is distributed on an "AS IS" BASIS,
  13  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  *  See the License for the specific language governing permissions and
  15  *  limitations under the License.
  16  */
  17
  18 package main
  19
  20 import (
  21         "bytes"
  22         "encoding/json"
  23         "errors"
  24         "fmt"
  25         "io/ioutil"
  26         "net/http"
  27         "time"
  28 )
  29
  30 // appmgr API
  31 const appmgrSubsPath = "/ric/v1/subscriptions"
  32
  33 var errPostingFailed error = errors.New("Posting subscriptions failed")
  34 var errWrongStatusCode error = errors.New("Wrong subscriptions response StatusCode")
  35
  36 func subscribexAppNotifications(targetUrl string, subscriptions chan subsChannel, timeout time.Duration, subsUrl string) {
  37         requestBody := []byte(fmt.Sprintf(`{"maxRetries": 5, "retryTimer": 5, "eventType":"all", "targetUrl": "%v"}`, targetUrl))
  38         req, err := http.NewRequest("POST", subsUrl, bytes.NewBuffer(requestBody))
  39         if err != nil {
  40                 logger.Error("Setting NewRequest failed: %s", err)
  41                 subscriptions <- subsChannel{false, err}
  42                 return
  43         }
  44         req.Header.Set("Content-Type", "application/json")
  45         client := &http.Client{}
  46         client.Timeout = time.Second * timeout
  47         for {
  48                 err := subscribexAppNotificationsClientDo(req, client)
  49                 if err == nil {
  50                         break
  51                 } else if err != errPostingFailed && err != errWrongStatusCode {
  52                         subscriptions <- subsChannel{false, err}
  53                         return
  54                 }
  55                 time.Sleep(5 * time.Second)
  56         }
  57         subscriptions <- subsChannel{true, nil}
  58 }
  59
  60 func subscribexAppNotificationsClientDo(req *http.Request, client *http.Client) error {
  61         resp, err := client.Do(req)
  62         if err != nil {
  63                 logger.Error("Posting subscriptions failed: %s", err)
  64                 return errPostingFailed
  65         } else {
  66                 defer resp.Body.Close()
  67                 if resp.StatusCode == http.StatusCreated {
  68                         logger.Info("Subscriptions response StatusCode: %d", resp.StatusCode)
  69                         logger.Info("Subscriptions response headers: %s", resp.Header)
  70                         body, err := ioutil.ReadAll(resp.Body)
  71                         if err != nil {
  72                                 logger.Error("Subscriptions response Body read failed: %s", err)
  73                                 return err
  74                         }
  75                         logger.Info("Response Body: %s", body)
  76                         var result map[string]interface{}
  77                         if err := json.Unmarshal([]byte(body), &result); err != nil {
  78                                 logger.Error("json.Unmarshal failed: %s", err)
  79                                 return err
  80                         }
  81                         logger.Info("Subscription id from the response: %s", result["id"].(string))
  82                         vesmgr.appmgrSubsId = result["id"].(string)
  83                         return nil
  84                 } else {
  85                         logger.Error("Wrong subscriptions response StatusCode: %d", resp.StatusCode)
  86                         return errWrongStatusCode
  87                 }
  88         }
  89 }