Updated README.md and debug logs

Author: kompotkot

nodes/node_balancer/README.md

@@ -41,6 +41,8 @@ So if with request will be specified tag `local` will be returned node with corr
 
 ## Work with nodebalancer
 
+**IMPORTANT** Do not use flag `-debug` in production.
+
 ### add-access
 
 Add new access for user:
@@ -127,3 +129,16 @@ For Web3 providers `access_id` and `data_source` could be specified in headers
 --header 'x-node-balancer-data-source: <blockchain/database>'
 --header 'x-node-balancer-access-id: <access_id>'
 ```
+
+Same request to fetch specific nodes using tags
+
+```bash
+curl --request POST 'http://127.0.0.1:8544/nb/ethereum/jsonrpc?access_id=<access_id>&data_source=<blockchain/database>&tag=<specific_tag_1>&tag=<specific_tag_2>' \
+    --header 'Content-Type: application/json' \
+    --data-raw '{
+        "jsonrpc":"2.0",
+        "method":"eth_getBlockByNumber",
+        "params":["latest", false],
+        "id":1
+    }'
+```

nodes/node_balancer/cmd/nodebalancer/middleware.go

@@ -105,7 +105,7 @@ func initCacheCleaning() {
 		case <-t.C:
 			removedAccessIds, totalAccessIds := accessIdCache.Cleanup()
 			if stateCLI.enableDebugFlag {
-				log.Printf("Removed %d elements from access id cache", removedAccessIds)
+				log.Printf("[DEBUG] Removed %d elements from access id cache", removedAccessIds)
 			}
 			log.Printf("Elements in access id cache: %d", totalAccessIds)
 		}
@@ -241,7 +241,7 @@ func logMiddleware(next http.Handler) http.Handler {
 
 		if stateCLI.enableDebugFlag {
 			if r.URL.RawQuery != "" {
-				logStr += fmt.Sprintf(" %s", r.URL.RawQuery)
+				logStr += fmt.Sprintf(" [DEBUG] %s", r.URL.RawQuery)
 			}
 			accessID := extractAccessID(r)
 			if accessID != "" {
@@ -269,20 +269,20 @@ func accessMiddleware(next http.Handler) http.Handler {
 		// If access id does not belong to internal crawlers, then check cache or find it in Bugout resources
 		if accessID == NB_CONTROLLER_ACCESS_ID {
 			if stateCLI.enableDebugFlag {
-				log.Printf("Access id belongs to internal crawlers")
+				log.Printf("[DEBUG] Access id belongs to internal crawlers")
 			}
 			currentClientAccess = internalCrawlersAccess
 			currentClientAccess.dataSource = dataSource
 		} else if accessIdCache.FindAccessIdInCache(accessID) != "" {
 			if stateCLI.enableDebugFlag {
-				log.Printf("Access id found in cache")
+				log.Printf("[DEBUG] Access id found in cache")
 			}
 			currentClientAccess = accessIdCache.accessIds[accessID]
 			currentClientAccess.dataSource = dataSource
 			accessIdCache.UpdateAccessIdAtCache(accessID, dataSource)
 		} else {
 			if stateCLI.enableDebugFlag {
-				log.Printf("New access id, looking at Brood resources")
+				log.Printf("[DEBUG] New access id, looking at Brood resources")
 			}
 			resources, err := bugoutClient.Brood.GetResources(
 				NB_CONTROLLER_TOKEN,

nodes/node_balancer/cmd/nodebalancer/routes.go

@@ -114,6 +114,10 @@ func lbJSONRPCHandler(w http.ResponseWriter, r *http.Request, blockchain string,
 		cpool.AddClientNode(currentClientAccess.AccessID, node)
 	}
 
+	if stateCLI.enableDebugFlag {
+		log.Printf("[DEBUG] Used node with endpoint: %s, call counter equals: %d", node.Endpoint, node.CallCounter)
+	}
+
 	switch {
 	case currentClientAccess.dataSource == "blockchain":
 		if currentClientAccess.BlockchainAccess == false {