jsonSender.go

   1 //
   2 // Copyright 2019 AT&T Intellectual Property
   3 // Copyright 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 package sender
  18
  19 import (
  20         "../frontend"
  21         "../rmr"
  22         "fmt"
  23         "github.com/pkg/errors"
  24         "log"
  25         "reflect"
  26         "strconv"
  27         "strings"
  28         "sync/atomic"
  29         "time"
  30         "unicode"
  31 )
  32
  33 var counter uint64
  34
  35 func SendJsonRmrMessage(command frontend.JsonCommand /*the copy is modified locally*/, xAction *[]byte, r *rmr.Service) error {
  36         var payload []byte
  37         _, err := fmt.Sscanf(command.PackedPayload, "%x", &payload)
  38         if err != nil {
  39                 return errors.New(fmt.Sprintf("convert inputPayloadAsStr to payloadAsByte. Error: %v\n", err))
  40         }
  41         command.PackedPayload = string(payload)
  42         command.TransactionId = expandTransactionId(command.TransactionId)
  43         if len(command.TransactionId) == 0 {
  44                 command.TransactionId = string(*xAction)
  45         }
  46         command.PayloadHeader = expandPayloadHeader(command.PayloadHeader, &command)
  47         rmrMsgId, err := rmr.MessageIdToUint(command.RmrMessageType)
  48         if err != nil {
  49                 return errors.New(fmt.Sprintf("invalid rmr message id: %s",command.WaitForRmrMessageType))
  50         }
  51         _, err = r.SendMessage(int(rmrMsgId), append([]byte(command.PayloadHeader), payload...), []byte(command.TransactionId))
  52         return err
  53 }
  54
  55 /*
  56  * transactionId (xAction): The value may have a fixed value or $ or <prefix>$.
  57  * $ is replaced by a value generated at runtime (possibly unique per message sent).
  58  * If the tag does not exist, then the mock shall use the value taken from the incoming message.
  59  */
  60 func expandTransactionId(id string) string {
  61         if len(id) == 1 && id[0] == '$' {
  62                 return fmt.Sprintf("%d", incAndGetCounter())
  63         }
  64         if len(id) > 1 && id[len(id)-1] == '$' {
  65                 return fmt.Sprintf("%s%d", id[:len(id)-1], incAndGetCounter())
  66         }
  67         return id
  68 }
  69
  70 /*
  71  * payloadHeader: A prefix to combine with the payload that will be the message’s payload. The value may include variables of the format $<name> or #<name> where:
  72  *   $<name> expands to the value of <name> if it exists or the empty string if not.
  73  *   #<name> expands to the length of the value of <name> if it exists or omitted if not.
  74  * The intention is to allow the Mock to construct the payload header required by the setup messages (ranIp|ranPort|ranName|payload len|<payload>).
  75  * Example: “payloadHeader”: “$ranIp|$ranPort|$ranName|#packedPayload|”
  76  */
  77
  78 func expandPayloadHeader(header string, command *frontend.JsonCommand) string {
  79         var name strings.Builder
  80         var expandedHeader strings.Builder
  81
  82         r := strings.NewReader(header)
  83         ch, err := r.ReadByte()
  84         for {
  85                 if err != nil {
  86                         break
  87                 }
  88                 switch ch {
  89                 case '$':
  90                         for {
  91                                 ch, err = r.ReadByte()  //on error ch == 0
  92                                 if unicode.IsDigit(rune(ch)) || unicode.IsLetter(rune(ch)) {
  93                                         name.WriteByte(ch)
  94                                 } else {
  95                                         if fieldValue := reflect.Indirect(reflect.ValueOf(command)).FieldByName(name.String()); fieldValue.IsValid() {
  96                                                 switch fieldValue.Kind() {
  97                                                 case reflect.String:
  98                                                         expandedHeader.WriteString(fieldValue.String())
  99                                                 case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
 100                                                         expandedHeader.WriteString(strconv.FormatInt(fieldValue.Int(), 10))
 101                                                 case reflect.Bool:
 102                                                         expandedHeader.WriteString(strconv.FormatBool(fieldValue.Bool()))
 103                                                 case reflect.Float64, reflect.Float32:
 104                                                         expandedHeader.WriteString(fmt.Sprintf("%g", fieldValue.Float()))
 105                                                 default:
 106                                                         log.Fatalf("invalid type for $%s, value must be a string, an int, a bool or a float", name.String())
 107                                                 }
 108                                         }
 109                                         name.Reset()
 110                                         break
 111                                 }
 112                         }
 113                 case '#':
 114                         for {
 115                                 ch, err = r.ReadByte()  //on error ch == 0
 116                                 if unicode.IsDigit(rune(ch)) || unicode.IsLetter(rune(ch)) {
 117                                         name.WriteByte(ch)
 118                                 } else {
 119                                         if fieldValue := reflect.Indirect(reflect.ValueOf(command)).FieldByName(name.String()); fieldValue.IsValid() {
 120                                                 if fieldValue.Kind() == reflect.String {
 121                                                         expandedHeader.WriteString(strconv.FormatInt(int64(len(fieldValue.String())), 10))
 122                                                 } else {
 123                                                         log.Fatalf("invalid type for #%s, value must be a string", name.String())
 124                                                 }
 125                                         }
 126                                         name.Reset()
 127                                         break
 128                                 }
 129                         }
 130                 default:
 131                         if unicode.IsPrint(rune(ch)) {
 132                                 expandedHeader.WriteByte(ch)
 133                         }
 134                         ch, err = r.ReadByte()
 135                 }
 136         }
 137         return expandedHeader.String()
 138 }
 139
 140 func incAndGetCounter() uint64 {
 141         return atomic.AddUint64(&counter, 1)
 142 }
 143
 144 func init() {
 145         counter = uint64(time.Now().Second())
 146 }