reduce error logging on connection resets (#214)

log "Connection reset" error in INFO level
Fixed: #215

Author: kaisecheng

CHANGELOG.md

@@ -1,3 +1,6 @@
+## 6.3.4
+  - Fix: reduce error logging (to info level) on connection resets [#214](https://github.com/logstash-plugins/logstash-input-tcp/pull/214)
+
 ## 6.3.3
   - bump netty to 4.1.93 [#212](https://github.com/logstash-plugins/logstash-input-tcp/pull/212)
 

src/main/java/org/logstash/tcp/InputLoop.java

@@ -188,6 +188,8 @@ private static final class DecoderAdapter extends ChannelInboundHandlerAdapter {
              */
             private final Logger logger;
 
+            private static final String CONNECTION_RESET_ERROR_MSG = "Connection reset";
+
             /**
              * Ctor.
              * @param decoder {@link Decoder} provided by JRuby.
@@ -221,10 +223,7 @@ public void exceptionCaught(final ChannelHandlerContext ctx, final Throwable cau
 
             private boolean silentException(final Throwable ex) {
                 if (ex instanceof IOException) {
-                    final String message = ex.getMessage();
-                    if ("Connection reset by peer".equals(message)) {
-                        return true;
-                    }
+                    return ex.getMessage() != null && ex.getMessage().contains(CONNECTION_RESET_ERROR_MSG);
                 }
                 return false;
             }

version

@@ -1 +1 @@
-6.3.3
+6.3.4