From b17e96e121bfd424b064d5639b41bc280acbf00c Mon Sep 17 00:00:00 2001
From: catbref <misc-github@talk2dom.com>
Date: Sat, 13 Aug 2022 15:42:24 +0100
Subject: [PATCH] Log count & total size of peer messages sent & received when
 a peer is disconnected. Requires org.qortal.net.Peer logging level set to
 DEBUG

---
 src/main/java/org/qortal/network/Peer.java | 54 ++++++++++++++++++++++
 1 file changed, 54 insertions(+)

diff --git a/src/main/java/org/qortal/network/Peer.java b/src/main/java/org/qortal/network/Peer.java
index f99a94b1..31eb4569 100644
--- a/src/main/java/org/qortal/network/Peer.java
+++ b/src/main/java/org/qortal/network/Peer.java
@@ -27,6 +27,8 @@ import java.nio.channels.SocketChannel;
 import java.security.SecureRandom;
 import java.util.*;
 import java.util.concurrent.*;
+import java.util.concurrent.atomic.LongAccumulator;
+import java.util.concurrent.atomic.LongAdder;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
@@ -153,6 +155,16 @@ public class Peer {
      */
     private CommonBlockData commonBlockData;
 
+    // Message stats
+
+    private static class MessageStats {
+        public final LongAdder count = new LongAdder();
+        public final LongAdder totalBytes = new LongAdder();
+    }
+
+    private final Map<MessageType, MessageStats> receivedMessageStats = new ConcurrentHashMap<>();
+    private final Map<MessageType, MessageStats> sentMessageStats = new ConcurrentHashMap<>();
+
     // Constructors
 
     /**
@@ -542,11 +554,18 @@ public class Peer {
                     // Tidy up buffers:
                     this.byteBuffer.flip();
                     // Read-only, flipped buffer's position will be after end of message, so copy that
+                    long messageByteSize = readOnlyBuffer.position();
                     this.byteBuffer.position(readOnlyBuffer.position());
                     // Copy bytes after read message to front of buffer,
                     // adjusting position accordingly, reset limit to capacity
                     this.byteBuffer.compact();
 
+                    // Record message stats
+                    MessageStats messageStats = this.receivedMessageStats.computeIfAbsent(message.getType(), k -> new MessageStats());
+                    // Ideally these two operations would be atomic, we could pack 'count' in top X bits of the 64-bit long, but meh
+                    messageStats.count.increment();
+                    messageStats.totalBytes.add(messageByteSize);
+
                     // Unsupported message type? Discard with no further processing
                     if (message.getType() == MessageType.UNSUPPORTED)
                         continue;
@@ -609,6 +628,12 @@ public class Peer {
 
                     LOGGER.trace("[{}] Sending {} message with ID {} to peer {}",
                             this.peerConnectionId, this.outputMessageType, this.outputMessageId, this);
+
+                    // Record message stats
+                    MessageStats messageStats = this.sentMessageStats.computeIfAbsent(message.getType(), k -> new MessageStats());
+                    // Ideally these two operations would be atomic, we could pack 'count' in top X bits of the 64-bit long, but meh
+                    messageStats.count.increment();
+                    messageStats.totalBytes.add(this.outputBuffer.limit());
                 } catch (MessageException e) {
                     // Something went wrong converting message to bytes, so discard but allow another round
                     LOGGER.warn("[{}] Failed to send {} message with ID {} to peer {}: {}", this.peerConnectionId,
@@ -799,8 +824,11 @@ public class Peer {
     }
 
     public void shutdown() {
+        boolean logStats = false;
+
         if (!isStopping) {
             LOGGER.debug("[{}] Shutting down peer {}", this.peerConnectionId, this);
+            logStats = true;
         }
         isStopping = true;
 
@@ -812,8 +840,34 @@ public class Peer {
                 LOGGER.debug("[{}] IOException while trying to close peer {}", this.peerConnectionId, this);
             }
         }
+
+        if (logStats) {
+            StringBuilder statsBuilder = new StringBuilder(1024);
+            statsBuilder.append("peer ").append(this).append(" message stats:\n=received=");
+            appendMessageStats(statsBuilder, this.receivedMessageStats);
+            statsBuilder.append("\n=sent=");
+            appendMessageStats(statsBuilder, this.sentMessageStats);
+
+            LOGGER.debug(statsBuilder.toString());
+        }
     }
 
+    private static void appendMessageStats(StringBuilder statsBuilder, Map<MessageType, MessageStats> messageStats) {
+        if (messageStats.isEmpty()) {
+            statsBuilder.append("\n  none");
+            return;
+        }
+
+        messageStats.keySet().stream()
+                .sorted(Comparator.comparing(MessageType::name))
+                .forEach(messageType -> {
+                    MessageStats stats = messageStats.get(messageType);
+
+                    statsBuilder.append("\n  ").append(messageType.name())
+                            .append(": count=").append(stats.count.sum())
+                            .append(", total bytes=").append(stats.totalBytes.sum());
+                });
+    }
 
     // Minimum version