Fix error

Signed-off-by: JCW <a1q123456@users.noreply.github.com>

include/xrpl/beast/utility/Journal.h

@@ -461,9 +461,14 @@ public:
         StringBuffer messageBuffer_;
         detail::SimpleJsonWriter jsonWriter_;
         bool hasMessageParams_ = false;
-        bool messageBufferHandedOut_ = true;
+        std::size_t messageOffset_ = 0;
     public:
 
+        JsonLogContext()
+            : messageBuffer_(rentFromPool())
+            , jsonWriter_(&messageBuffer_.str())
+        {}
+
         StringBuffer
         messageBuffer() { return messageBuffer_; }
 
@@ -493,6 +498,9 @@ public:
             return jsonWriter_;
         }
 
+        void
+        reuseJson();
+
         void
         finish();
 
@@ -739,11 +747,32 @@ public:
         /** Output stream support. */
         /** @{ */
         ScopedStream
-        operator<<(std::ostream& manip(std::ostream&)) const;
+        operator<<(std::ostream& manip(std::ostream&)) const &&
+        {
+            return {*this, manip};
+        }
 
         template <typename T>
         ScopedStream
-        operator<<(T const& t) const;
+        operator<<(T const& t) const &&
+        {
+            return {*this, t};
+        }
+
+        ScopedStream
+        operator<<(std::ostream& manip(std::ostream&)) const &
+        {
+            currentJsonLogContext_.reuseJson();
+            return {*this, manip};
+        }
+
+        template <typename T>
+        ScopedStream
+        operator<<(T const& t) const &
+        {
+            currentJsonLogContext_.reuseJson();
+            return {*this, t};
+        }
         /** @} */
 
     private:
@@ -955,13 +984,6 @@ Journal::ScopedStream::operator<<(T const& t) const
 
 //------------------------------------------------------------------------------
 
-template <typename T>
-Journal::ScopedStream
-Journal::Stream::operator<<(T const& t) const
-{
-    return {*this, t};
-}
-
 namespace detail {
 
 template <class CharT, class Traits = std::char_traits<CharT>>

src/libxrpl/beast/utility/beast_Journal.cpp

@@ -223,19 +223,13 @@ Journal::JsonLogContext::start(
     };
     thread_local ThreadIdStringInitializer const threadId;
 
-    if (!messageBufferHandedOut_)
+    messageOffset_ = 0;
-    {
-        returnStringBuffer(std::move(messageBuffer_));
-        messageBufferHandedOut_ = true;
-    }
-    messageBuffer_ = rentFromPool();
-    messageBufferHandedOut_ = false;
-    messageBuffer_.str().reserve(1024 * 5);
     messageBuffer_.str().clear();
     jsonWriter_ = detail::SimpleJsonWriter{&messageBuffer_.str()};
 
     if (!jsonLogsEnabled_)
     {
+        messageBuffer_.str() = journalAttributes;
         return;
     }
 
@@ -293,12 +287,28 @@ Journal::JsonLogContext::start(
     hasMessageParams_ = false;
 }
 
+void
+Journal::JsonLogContext::reuseJson()
+{
+    messageOffset_ = messageBuffer_.str().size();
+}
 void
 Journal::JsonLogContext::finish()
 {
-    messageBufferHandedOut_ = true;
+    if (messageOffset_ != 0)
-    messageBuffer_ = {};
+    {
-    jsonWriter_ = {};
+        auto buffer = rentFromPool();
+        std::string_view json{messageBuffer_.str()};
+        buffer.str() = json.substr(0, messageOffset_);
+        messageBuffer_ = buffer;
+    }
+    else
+    {
+        messageBuffer_ = rentFromPool();
+    }
+    
+    messageBuffer_.str().reserve(1024 * 5);
+    jsonWriter_ = detail::SimpleJsonWriter{&messageBuffer_.str()};
 }
 
 void
@@ -414,8 +424,8 @@ Journal::ScopedStream::~ScopedStream()
             s = "";
 
         auto messageHandle = formatLog(s);
-        m_sink.write(m_level, messageHandle);
         currentJsonLogContext_.finish();
+        m_sink.write(m_level, messageHandle);
     }
 }