refactor: rename command -> message type in comments in the src/net* files

Co-authored-by: Sebastian Falbesoner <sebastian.falbesoner@gmail.com>

Author: shaavan

src/net.cpp

@@ -651,14 +651,14 @@ bool CNode::ReceiveMsgBytes(Span<const uint8_t> msg_bytes, bool& complete)
             bool reject_message{false};
             CNetMessage msg = m_deserializer->GetMessage(time, reject_message);
             if (reject_message) {
-                // Message deserialization failed.  Drop the message but don't disconnect the peer.
+                // Message deserialization failed. Drop the message but don't disconnect the peer.
                 // store the size of the corrupt message
                 mapRecvBytesPerMsgType.at(NET_MESSAGE_TYPE_OTHER) += msg.m_raw_message_size;
                 continue;
             }
 
-            // Store received bytes per message command
-            // to prevent a memory DOS, only allow valid commands
+            // Store received bytes per message type.
+            // To prevent a memory DOS, only allow known message types.
             auto i = mapRecvBytesPerMsgType.find(msg.m_type);
             if (i == mapRecvBytesPerMsgType.end()) {
                 i = mapRecvBytesPerMsgType.find(NET_MESSAGE_TYPE_OTHER);
@@ -748,7 +748,7 @@ CNetMessage V1TransportDeserializer::GetMessage(const std::chrono::microseconds
     // decompose a single CNetMessage from the TransportDeserializer
     CNetMessage msg(std::move(vRecv));
 
-    // store command string, time, and sizes
+    // store message type string, time, and sizes
     msg.m_type = hdr.GetCommand();
     msg.m_time = time;
     msg.m_message_size = hdr.nMessageSize;
@@ -759,7 +759,7 @@ CNetMessage V1TransportDeserializer::GetMessage(const std::chrono::microseconds
     // We just received a message off the wire, harvest entropy from the time (and the message checksum)
     RandAddEvent(ReadLE32(hash.begin()));
 
-    // Check checksum and header command string
+    // Check checksum and header message type string
     if (memcmp(hash.begin(), hdr.pchChecksum, CMessageHeader::CHECKSUM_SIZE) != 0) {
         LogPrint(BCLog::NET, "Header error: Wrong checksum (%s, %u bytes), expected %s was %s, peer=%d\n",
                  SanitizeString(msg.m_type), msg.m_message_size,

src/net.h

@@ -234,7 +234,7 @@ extern Mutex g_maplocalhost_mutex;
 extern std::map<CNetAddr, LocalServiceInfo> mapLocalHost GUARDED_BY(g_maplocalhost_mutex);
 
 extern const std::string NET_MESSAGE_TYPE_OTHER;
-typedef std::map<std::string, uint64_t> mapMsgTypeSize; //command, total bytes
+using mapMsgTypeSize = std::map</* message type */ std::string, /* total bytes */ uint64_t>;
 
 class CNodeStats
 {
@@ -298,7 +298,7 @@ class CNetMessage {
 
 /** The TransportDeserializer takes care of holding and deserializing the
  * network receive buffer. It can deserialize the network buffer into a
- * transport protocol agnostic CNetMessage (command & payload)
+ * transport protocol agnostic CNetMessage (message type & payload)
  */
 class TransportDeserializer {
 public: