ignore empty lines if "decode line fail, not a json string"

Author: SwimmingTiger

src/Utils.cc

@@ -228,3 +228,7 @@ string str2lower(const string &str) {
   std::transform(data.begin(), data.end(), data.begin(), ::tolower);
   return data;
 }
+
+bool strEmpty(const string &str) {
+  return str.find_last_not_of(" \t\f\v\n\r") == str.npos;
+}

src/Utils.h

@@ -133,5 +133,6 @@ bool parseConfJson(const string &jsonStr,
 const char *splitNotify(const string &line, int number = 14);
 
 string str2lower(const string &str);
+bool strEmpty(const string &str);
 
 #endif

src/bitcoin/ServerBitcoin.cc

@@ -503,7 +503,9 @@ void UpStratumClientBitcoin::handleStratumMessage(const string &line) {
 
   StratumMessageBitcoin smsg(line);
   if (!smsg.isValid()) {
-    LOG(ERROR) << "decode line fail, not a json string" << std::endl;
+    if (!strEmpty(line)) {
+      LOG(ERROR) << "decode line fail, not a json string: " << line << std::endl;
+    }
     return;
   }
 
@@ -719,7 +721,9 @@ void StratumSessionBitcoin::handleStratumMessage(const string &line) {
 
   StratumMessageBitcoin smsg(line);
   if (!smsg.isValid()) {
-    LOG(ERROR) << "decode line fail, not a json string" << std::endl;
+    if (!strEmpty(line)) {
+      LOG(ERROR) << "decode line fail, not a json string: " << line << std::endl;
+    }
     return;
   }
 

src/eth/ServerEth.cc

@@ -587,7 +587,9 @@ void UpStratumClientEth::handleStratumMessage(const string &line) {
 
   StratumMessageEth smsg(line);
   if (!smsg.isValid()) {
-    LOG(ERROR) << "decode line fail, not a json string" << std::endl;
+    if (!strEmpty(line)) {
+      LOG(ERROR) << "decode line fail, not a json string: " << line << std::endl;
+    }
     return;
   }
 
@@ -792,7 +794,9 @@ void StratumSessionEth::handleStratumMessage(const string &line) {
 
   StratumMessageEth smsg(line);
   if (!smsg.isValid()) {
-    LOG(ERROR) << "decode line fail, not a json string" << std::endl;
+    if (!strEmpty(line)) {
+      LOG(ERROR) << "decode line fail, not a json string: " << line << std::endl;
+    }
     return;
   }