Add support to json format for _stats API (#663)

Co-authored-by: peterlimg <54137706+peterlimg@users.noreply.github.com>

Author: shaktals

code/go/0chain.net/blobbercore/handler/handler.go

@@ -293,7 +293,47 @@ func UpdateAttributesHandler(ctx context.Context, r *http.Request) (interface{},
 return response, nil
 }
 
+func writeResponse (w http.ResponseWriter, resp []byte) {
+_, err := w.Write(resp)
+
+if err != nil {
+Logger.Error("Error sending StatsHandler response", zap.Error(err))
+}
+}
+
 func StatsHandler(w http.ResponseWriter, r *http.Request) {
+isJSON := r.Header.Get("Accept") == "application/json"
+
+if isJSON {
+blobberInfo := GetBlobberInfoJson()
+
+ctx := datastore.GetStore().CreateTransaction(r.Context())
+blobberStats, err := stats.StatsJSONHandler(ctx, r)
+
+if err != nil {
+Logger.Error("Error getting blobber JSON stats", zap.Error(err))
+
+w.WriteHeader(http.StatusInternalServerError)
+writeResponse(w, []byte(err.Error()))
+return
+}
+
+blobberInfo.Stats = blobberStats
+
+statsJson, err := json.Marshal(blobberInfo)
+
+if err != nil {
+Logger.Error("Error marshaling JSON stats", zap.Error(err))
+
+w.WriteHeader(http.StatusInternalServerError)
+writeResponse(w, []byte(err.Error()))
+return
+}
+
+writeResponse(w, statsJson)
+
+return
+}
 
 HTMLHeader(w, "Blobber Diagnostics")
 PrintCSS(w)

code/go/0chain.net/blobbercore/handler/handler_common.go

@@ -94,6 +94,27 @@ func HomepageHandler(w http.ResponseWriter, r *http.Request) {
 fmt.Fprintf(w, "</br>")
 }
 
+type BlobberInfo struct {
+ChainId string `json:"chain_id"`
+BlobberId string `json:"blobber_id"`
+BlobberPublicKey string `json:"public_key"`
+BuildTag string `json:"build_tag"`
+Stats interface{} `json:"stats"`
+}
+
+func GetBlobberInfoJson() BlobberInfo {
+mc := chain.GetServerChain()
+
+blobberInfo := BlobberInfo{
+ChainId: mc.ID,
+BlobberId: node.Self.ID,
+BlobberPublicKey: node.Self.PublicKey,
+BuildTag: build.BuildTag,
+}
+
+return blobberInfo
+}
+
 func WithStatusConnection(handler common.StatusCodeResponderF) common.StatusCodeResponderF {
 return func(ctx context.Context, r *http.Request) (resp interface{}, statusCode int, err error) {
 ctx = GetMetaDataStore().CreateTransaction(ctx)