cmd/bpa-operator/vendor/github.com/Azure/go-autorest/autorest/azure/rp.go

   1 // Copyright 2017 Microsoft Corporation
   2 //
   3 //  Licensed under the Apache License, Version 2.0 (the "License");
   4 //  you may not use this file except in compliance with the License.
   5 //  You may obtain a copy of the License at
   6 //
   7 //      http://www.apache.org/licenses/LICENSE-2.0
   8 //
   9 //  Unless required by applicable law or agreed to in writing, software
  10 //  distributed under the License is distributed on an "AS IS" BASIS,
  11 //  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 //  See the License for the specific language governing permissions and
  13 //  limitations under the License.
  14
  15 package azure
  16
  17 import (
  18         "errors"
  19         "fmt"
  20         "net/http"
  21         "net/url"
  22         "strings"
  23         "time"
  24
  25         "github.com/Azure/go-autorest/autorest"
  26 )
  27
  28 // DoRetryWithRegistration tries to register the resource provider in case it is unregistered.
  29 // It also handles request retries
  30 func DoRetryWithRegistration(client autorest.Client) autorest.SendDecorator {
  31         return func(s autorest.Sender) autorest.Sender {
  32                 return autorest.SenderFunc(func(r *http.Request) (resp *http.Response, err error) {
  33                         rr := autorest.NewRetriableRequest(r)
  34                         for currentAttempt := 0; currentAttempt < client.RetryAttempts; currentAttempt++ {
  35                                 err = rr.Prepare()
  36                                 if err != nil {
  37                                         return resp, err
  38                                 }
  39
  40                                 resp, err = autorest.SendWithSender(s, rr.Request(),
  41                                         autorest.DoRetryForStatusCodes(client.RetryAttempts, client.RetryDuration, autorest.StatusCodesForRetry...),
  42                                 )
  43                                 if err != nil {
  44                                         return resp, err
  45                                 }
  46
  47                                 if resp.StatusCode != http.StatusConflict || client.SkipResourceProviderRegistration {
  48                                         return resp, err
  49                                 }
  50                                 var re RequestError
  51                                 err = autorest.Respond(
  52                                         resp,
  53                                         autorest.ByUnmarshallingJSON(&re),
  54                                 )
  55                                 if err != nil {
  56                                         return resp, err
  57                                 }
  58                                 err = re
  59
  60                                 if re.ServiceError != nil && re.ServiceError.Code == "MissingSubscriptionRegistration" {
  61                                         regErr := register(client, r, re)
  62                                         if regErr != nil {
  63                                                 return resp, fmt.Errorf("failed auto registering Resource Provider: %s. Original error: %s", regErr, err)
  64                                         }
  65                                 }
  66                         }
  67                         return resp, err
  68                 })
  69         }
  70 }
  71
  72 func getProvider(re RequestError) (string, error) {
  73         if re.ServiceError != nil && len(re.ServiceError.Details) > 0 {
  74                 return re.ServiceError.Details[0]["target"].(string), nil
  75         }
  76         return "", errors.New("provider was not found in the response")
  77 }
  78
  79 func register(client autorest.Client, originalReq *http.Request, re RequestError) error {
  80         subID := getSubscription(originalReq.URL.Path)
  81         if subID == "" {
  82                 return errors.New("missing parameter subscriptionID to register resource provider")
  83         }
  84         providerName, err := getProvider(re)
  85         if err != nil {
  86                 return fmt.Errorf("missing parameter provider to register resource provider: %s", err)
  87         }
  88         newURL := url.URL{
  89                 Scheme: originalReq.URL.Scheme,
  90                 Host:   originalReq.URL.Host,
  91         }
  92
  93         // taken from the resources SDK
  94         // with almost identical code, this sections are easier to mantain
  95         // It is also not a good idea to import the SDK here
  96         // https://github.com/Azure/azure-sdk-for-go/blob/9f366792afa3e0ddaecdc860e793ba9d75e76c27/arm/resources/resources/providers.go#L252
  97         pathParameters := map[string]interface{}{
  98                 "resourceProviderNamespace": autorest.Encode("path", providerName),
  99                 "subscriptionId":            autorest.Encode("path", subID),
 100         }
 101
 102         const APIVersion = "2016-09-01"
 103         queryParameters := map[string]interface{}{
 104                 "api-version": APIVersion,
 105         }
 106
 107         preparer := autorest.CreatePreparer(
 108                 autorest.AsPost(),
 109                 autorest.WithBaseURL(newURL.String()),
 110                 autorest.WithPathParameters("/subscriptions/{subscriptionId}/providers/{resourceProviderNamespace}/register", pathParameters),
 111                 autorest.WithQueryParameters(queryParameters),
 112         )
 113
 114         req, err := preparer.Prepare(&http.Request{})
 115         if err != nil {
 116                 return err
 117         }
 118         req = req.WithContext(originalReq.Context())
 119
 120         resp, err := autorest.SendWithSender(client, req,
 121                 autorest.DoRetryForStatusCodes(client.RetryAttempts, client.RetryDuration, autorest.StatusCodesForRetry...),
 122         )
 123         if err != nil {
 124                 return err
 125         }
 126
 127         type Provider struct {
 128                 RegistrationState *string `json:"registrationState,omitempty"`
 129         }
 130         var provider Provider
 131
 132         err = autorest.Respond(
 133                 resp,
 134                 WithErrorUnlessStatusCode(http.StatusOK),
 135                 autorest.ByUnmarshallingJSON(&provider),
 136                 autorest.ByClosing(),
 137         )
 138         if err != nil {
 139                 return err
 140         }
 141
 142         // poll for registered provisioning state
 143         registrationStartTime := time.Now()
 144         for err == nil && (client.PollingDuration == 0 || (client.PollingDuration != 0 && time.Since(registrationStartTime) < client.PollingDuration)) {
 145                 // taken from the resources SDK
 146                 // https://github.com/Azure/azure-sdk-for-go/blob/9f366792afa3e0ddaecdc860e793ba9d75e76c27/arm/resources/resources/providers.go#L45
 147                 preparer := autorest.CreatePreparer(
 148                         autorest.AsGet(),
 149                         autorest.WithBaseURL(newURL.String()),
 150                         autorest.WithPathParameters("/subscriptions/{subscriptionId}/providers/{resourceProviderNamespace}", pathParameters),
 151                         autorest.WithQueryParameters(queryParameters),
 152                 )
 153                 req, err = preparer.Prepare(&http.Request{})
 154                 if err != nil {
 155                         return err
 156                 }
 157                 req = req.WithContext(originalReq.Context())
 158
 159                 resp, err := autorest.SendWithSender(client, req,
 160                         autorest.DoRetryForStatusCodes(client.RetryAttempts, client.RetryDuration, autorest.StatusCodesForRetry...),
 161                 )
 162                 if err != nil {
 163                         return err
 164                 }
 165
 166                 err = autorest.Respond(
 167                         resp,
 168                         WithErrorUnlessStatusCode(http.StatusOK),
 169                         autorest.ByUnmarshallingJSON(&provider),
 170                         autorest.ByClosing(),
 171                 )
 172                 if err != nil {
 173                         return err
 174                 }
 175
 176                 if provider.RegistrationState != nil &&
 177                         *provider.RegistrationState == "Registered" {
 178                         break
 179                 }
 180
 181                 delayed := autorest.DelayWithRetryAfter(resp, originalReq.Context().Done())
 182                 if !delayed && !autorest.DelayForBackoff(client.PollingDelay, 0, originalReq.Context().Done()) {
 183                         return originalReq.Context().Err()
 184                 }
 185         }
 186         if client.PollingDuration != 0 && !(time.Since(registrationStartTime) < client.PollingDuration) {
 187                 return errors.New("polling for resource provider registration has exceeded the polling duration")
 188         }
 189         return err
 190 }
 191
 192 func getSubscription(path string) string {
 193         parts := strings.Split(path, "/")
 194         for i, v := range parts {
 195                 if v == "subscriptions" && (i+1) < len(parts) {
 196                         return parts[i+1]
 197                 }
 198         }
 199         return ""
 200 }