vnfs/DAaaS/microservices/GoApps/src/go-hdfs-writer/pkg/handler/handler.go

   1 package handler
   2
   3 import (
   4         "encoding/json"
   5         "fmt"
   6         "github.com/gorilla/mux"
   7         "io/ioutil"
   8         "net/http"
   9         "strings"
  10
  11         pipeline "hdfs-writer/pkg/pipeline"
  12         utils "hdfs-writer/pkg/utils"
  13 )
  14
  15 var slogger = utils.GetLoggerInstance()
  16
  17 // CreateRouter returns a http handler for the registered URLs
  18 func CreateRouter() http.Handler {
  19         router := mux.NewRouter().StrictSlash(true)
  20         slogger.Info("Created router ...")
  21         router.HandleFunc("/v1/writer", createWriter).Methods("POST")
  22         router.HandleFunc("/v1/writer/{writerName}", deleteWriter).Methods("DELETE")
  23         router.HandleFunc("/v1/writers", getAllWriters).Methods("GET")
  24         return router
  25 }
  26
  27 // CreateWriter creates a pipeline
  28 func createWriter(w http.ResponseWriter, r *http.Request) {
  29         if r.Body == nil {
  30                 http.Error(w, "Empty body", http.StatusBadRequest)
  31                 return
  32         }
  33         reqBody, err := ioutil.ReadAll(r.Body)
  34         if err != nil {
  35                 http.Error(w, err.Error(), http.StatusUnprocessableEntity)
  36                 return
  37         }
  38         slogger.Info(string(reqBody))
  39         var results utils.Pipeline
  40         error := json.Unmarshal(reqBody, &results)
  41         if error != nil {
  42                 unableToParse := fmt.Sprintf("Could not unmarshal the JSON in create request :: %s", err.Error())
  43                 fmt.Fprintln(w, unableToParse)
  44                 return
  45         }
  46         if validateKafkaConfig(results.KafkaConfiguration) == false {
  47                 http.Error(w, "Validation failed for kafka config items, check logs ..", http.StatusBadRequest)
  48                 return
  49         }
  50         if validateHdfsConfig(results.HdfsConfiguration) == false {
  51                 http.Error(w, "Validation failed for hdfs config items, check logs ..", http.StatusBadRequest)
  52                 return
  53         }
  54         writerName := pipeline.CreatePipeline(results.KafkaConfiguration, results.HdfsConfiguration)
  55         successMessage := fmt.Sprintf("Created the writer ::%s", writerName)
  56         w.Header().Set("Content-Type", "application/json")
  57         w.WriteHeader(http.StatusCreated)
  58         fmt.Fprintln(w, successMessage)
  59 }
  60
  61 // deleteWriter deletes a given writer pipeline
  62 func deleteWriter(w http.ResponseWriter, r *http.Request) {
  63         vars := mux.Vars(r)
  64         writerName := vars["writerName"]
  65         if _, keyExists := pipeline.ChannelMap[writerName]; keyExists {
  66                 pipeline.DeletePipeline(writerName)
  67                 w.WriteHeader(http.StatusOK)
  68                 deleteMessage := fmt.Sprintf("Deleted writer :: %s", writerName)
  69                 fmt.Fprintln(w, deleteMessage)
  70         } else {
  71                 notFoundMessage := fmt.Sprintf("Could not find writer :: %s", writerName)
  72                 fmt.Fprintln(w, notFoundMessage)
  73
  74         }
  75 }
  76
  77 // validateKafkaConfig validates the kafka config items and returns true if they are valid.
  78 func validateKafkaConfig(k utils.KafkaConfig) bool {
  79         if strings.TrimSpace(k.Broker) == "" {
  80                 fmt.Println("Broker is empty!")
  81                 slogger.Infof("Broker is empty!")
  82                 return false
  83         }
  84         if strings.TrimSpace(k.Group) == "" {
  85                 fmt.Println("Group is empty!")
  86                 slogger.Infof("Group is empty!")
  87                 return false
  88         }
  89         if strings.TrimSpace(k.Topic) == "" {
  90                 fmt.Println("Topic is empty!")
  91                 slogger.Infof("Topic is empty!")
  92                 return false
  93         }
  94         return true
  95 }
  96
  97 // validateHdfsConfig validates the kafka config items and returns true if they are valid.
  98 func validateHdfsConfig(h utils.HdfsConfig) bool {
  99         if strings.TrimSpace(h.HdfsURL) == "" {
 100                 fmt.Println("HdfsURL is empty!")
 101                 return false
 102         }
 103         return true
 104 }
 105
 106 // getAllWriters list down the active writers
 107 func getAllWriters(w http.ResponseWriter, r *http.Request) {
 108         slogger.Info("Listing all the writers  ...")
 109         var listOfWriters []string
 110         for k := range pipeline.ChannelMap {
 111                 listOfWriters = append(listOfWriters, k)
 112         }
 113         w.Header().Set("Content-Type", "application/json")
 114         w.WriteHeader(http.StatusOK)
 115         w.Write([]byte(fmt.Sprintf(`{"Writers" : "%v"}`, listOfWriters)))
 116 }