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 = errors.New("Posting subscriptions failed")
  34 var errWrongStatusCode = errors.New("Wrong subscriptions response StatusCode")
  35
  36 func subscribexAppNotifications(targetURL string, subscriptions chan subscriptionNotification, 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 <- subscriptionNotification{false, err, ""}
  42                 return
  43         }
  44         req.Header.Set("Content-Type", "application/json")
  45         client := &http.Client{}
  46         client.Timeout = time.Second * timeout
  47         var subsID string
  48         for {
  49                 subsID, err = subscribexAppNotificationsClientDo(req, client)
  50                 if err == nil {
  51                         break
  52                 } else if err != errPostingFailed && err != errWrongStatusCode {
  53                         subscriptions <- subscriptionNotification{false, err, ""}
  54                         return
  55                 }
  56                 time.Sleep(5 * time.Second)
  57         }
  58         subscriptions <- subscriptionNotification{true, nil, subsID}
  59 }
  60
  61 func subscribexAppNotificationsClientDo(req *http.Request, client *http.Client) (string, error) {
  62         resp, err := client.Do(req)
  63         if err != nil {
  64                 logger.Error("Posting subscriptions failed: %s", err)
  65                 return "", errPostingFailed
  66         }
  67         defer resp.Body.Close()
  68         if resp.StatusCode == http.StatusCreated {
  69                 logger.Info("Subscriptions response StatusCode: %d", resp.StatusCode)
  70                 logger.Info("Subscriptions response headers: %s", resp.Header)
  71                 body, err := ioutil.ReadAll(resp.Body)
  72                 if err != nil {
  73                         logger.Error("Subscriptions response Body read failed: %s", err)
  74                         return "", err
  75                 }
  76                 logger.Info("Response Body: %s", body)
  77                 var result map[string]interface{}
  78                 if err := json.Unmarshal([]byte(body), &result); err != nil {
  79                         logger.Error("json.Unmarshal failed: %s", err)
  80                         return "", err
  81                 }
  82                 logger.Info("Subscription id from the response: %s", result["id"].(string))
  83                 return result["id"].(string), nil
  84         }
  85         logger.Error("Wrong subscriptions response StatusCode: %d", resp.StatusCode)
  86         return "", errWrongStatusCode
  87 }