HDFSWriter microservice working copy

[demo.git] / vnfs / DAaaS / microservices / GoApps / src / go-hdfs-writer / pkg / handler / handler.go

diff --git a/vnfs/DAaaS/microservices/GoApps/src/go-hdfs-writer/pkg/handler/handler.go b/vnfs/DAaaS/microservices/GoApps/src/go-hdfs-writer/pkg/handler/handler.go
new file mode 100644 (file)
index 0000000..65021b4
--- /dev/null
+++ b/vnfs/DAaaS/microservices/GoApps/src/go-hdfs-writer/pkg/handler/handler.go
@@ -0,0 +1,96 @@
+package handler
+
+
+import (
+       "fmt"
+       "net/http"
+       "io/ioutil"
+       "encoding/json"
+       "github.com/gorilla/mux"
+
+       guuid "github.com/google/uuid"
+       pipeline "hdfs-writer/pkg/pipeline"
+       utils "hdfs-writer/pkg/utils"
+)
+
+
+var slogger = utils.GetLoggerInstance()
+// ChannelMap is the global map to store writerNames as key and channels as values.
+var ChannelMap =make(map[string]chan struct{})
+
+
+// This is a sample test request handler
+func testFunc(w http.ResponseWriter, r *http.Request){
+       slogger.Info("Invoking testFunc ...")
+       w.WriteHeader(http.StatusOK)
+       fmt.Fprintln(w,"HTTP Test successful ")
+}
+
+// CreateRouter returns a http handler for the registered URLs
+func CreateRouter() http.Handler{
+       router := mux.NewRouter().StrictSlash(true)
+       slogger.Info("Created router ...")
+       router.HandleFunc("/test", testFunc).Methods("GET")
+       router.HandleFunc("/createWriter", createWriter).Methods("POST")
+       router.HandleFunc("/deleteWriter/{writerName}", deleteWriter).Methods("DELETE")
+       return router
+}
+
+
+// CreateWriter creates a pipeline
+func createWriter(w http.ResponseWriter, r *http.Request){
+       reqBody, _ := ioutil.ReadAll(r.Body)
+       slogger.Info(string(reqBody))
+       var results map[string]interface{}
+       json.Unmarshal(reqBody, &results)
+       if len(results)==0{
+               slogger.Fatalf("Unable to read from the config json file, unable to create configObject map")
+       }
+       writerStr := "writer"
+       writer := results[writerStr].(map[string]interface{})
+       kafkaConfigMapObj := writer["kafkaConfig"].(map[string]interface{})
+       hdfsConfigObj := writer["hdfsConfig"].(map[string]interface{})
+
+       kc := utils.SetKafkaParametersByObjectMap(kafkaConfigMapObj)
+       hc := utils.SetHdfsParametersByObjectMap(hdfsConfigObj)
+
+       //populate the channelMap
+       pipelineChan := make(chan struct{})
+       slogger.Infof("Channel created by post :: %v", pipelineChan)
+       uuid := guuid.New().String()
+       //slogger.Infof("guuid :: %s",uuid)
+       slogger.Infof(":: Storing writerName and channel in ChannelMap :: ")
+       writerName := writerStr+"-"+uuid[len(uuid)-4:]
+       slogger.Infof("::writerName:: %s ",writerName)
+       ChannelMap[writerName] = pipelineChan
+       
+       // envoke the go routine to build pipeline
+       go pipeline.BuildWriterPipeline(kc,hc, writerName, ChannelMap[writerName])
+       successMessage := fmt.Sprintf("Created the writer ::%s", writerName)
+       w.WriteHeader(http.StatusOK)
+       fmt.Fprintln(w,successMessage)
+}
+
+
+// deleteWriter deletes a given writer pipeline
+func deleteWriter(w http.ResponseWriter, r *http.Request){
+       vars := mux.Vars(r)
+       writerName := vars["writerName"]
+       if _, keyExists := ChannelMap[writerName]; keyExists{
+               slogger.Infof("::Writer to be closed:: %s",writerName)
+               toBeClosedChannel := ChannelMap[writerName]
+               close(toBeClosedChannel)
+               // deleting the channel from ChannelMap after closure to 
+               // avoid closing the closed channel
+               delete(ChannelMap, writerName)
+
+               w.WriteHeader(http.StatusOK)
+               deleteMessage := fmt.Sprintf("Deleted writer :: %s",writerName)
+               fmt.Fprintln(w,deleteMessage)
+               
+       }else{
+               notFoundMessage := fmt.Sprintf("Could not find writer :: %s",writerName)
+               fmt.Fprintln(w,notFoundMessage)
+       }
+       
+}
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