Pass std::string_view by value, fix dangling reference in ServerHandler

Agent-Logs-Url: https://github.com/XRPLF/rippled/sessions/3aef40d0-f51b-484c-a5d3-43dd37d6187f

Co-authored-by: mvadari <8029314+mvadari@users.noreply.github.com>

Author: Copilot

include/xrpl/beast/rfc2616.h

@@ -182,7 +182,7 @@ split_commas(FwdIt first, FwdIt last)
 
 template <class Result = std::vector<std::string>>
 Result
-split_commas(std::string_view const& s)
+split_commas(std::string_view s)
 {
     return split_commas(s.begin(), s.end());
 }

include/xrpl/json/Output.h

@@ -8,12 +8,12 @@ namespace Json {
 
 class Value;
 
-using Output = std::function<void(std::string_view const&)>;
+using Output = std::function<void(std::string_view)>;
 
 inline Output
 stringOutput(std::string& s)
 {
-    return [&](std::string_view const& b) { s.append(b.data(), b.size()); };
+    return [&](std::string_view b) { s.append(b.data(), b.size()); };
 }
 
 /** Writes a minimal representation of a Json value to an Output in O(n) time.

src/libxrpl/json/Writer.cpp

@@ -88,14 +88,14 @@ class Writer::Impl
     }
 
     void
-    output(std::string_view const& bytes)
+    output(std::string_view bytes)
     {
         markStarted();
         output_(bytes);
     }
 
     void
-    stringOutput(std::string_view const& bytes)
+    stringOutput(std::string_view bytes)
     {
         markStarted();
         std::size_t position = 0, writtenUntil = 0;

src/xrpld/overlay/detail/ProtocolVersion.cpp

@@ -56,7 +56,7 @@ to_string(ProtocolVersion const& p)
 }
 
 std::vector<ProtocolVersion>
-parseProtocolVersions(std::string_view const& value)
+parseProtocolVersions(std::string_view value)
 {
     static boost::regex const re(
         "^"                        // start of line
@@ -126,7 +126,7 @@ negotiateProtocolVersion(std::vector<ProtocolVersion> const& versions)
 }
 
 std::optional<ProtocolVersion>
-negotiateProtocolVersion(std::string_view const& versions)
+negotiateProtocolVersion(std::string_view versions)
 {
     auto const them = parseProtocolVersions(versions);
 

src/xrpld/overlay/detail/ProtocolVersion.h

@@ -38,15 +38,15 @@ to_string(ProtocolVersion const& p);
           no duplicates and will be sorted in ascending protocol order.
 */
 std::vector<ProtocolVersion>
-parseProtocolVersions(std::string_view const& s);
+parseProtocolVersions(std::string_view s);
 
 /** Given a list of supported protocol versions, choose the one we prefer. */
 std::optional<ProtocolVersion>
 negotiateProtocolVersion(std::vector<ProtocolVersion> const& versions);
 
 /** Given a list of supported protocol versions, choose the one we prefer. */
 std::optional<ProtocolVersion>
-negotiateProtocolVersion(std::string_view const& versions);
+negotiateProtocolVersion(std::string_view versions);
 
 /** The list of all the protocol versions we support. */
 std::string const&

src/xrpld/rpc/detail/ServerHandler.cpp

@@ -230,7 +230,7 @@ ServerHandler::onHandoff(
 static inline Json::Output
 makeOutput(Session& session)
 {
-    return [&](std::string_view const& b) { session.write(b.data(), b.size()); };
+    return [&](std::string_view b) { session.write(b.data(), b.size()); };
 }
 
 static std::map<std::string, std::string>
@@ -535,7 +535,7 @@ ServerHandler::processSession(
             auto const iter = session->request().find("X-User");
             if (iter != session->request().end())
             {
-                auto const val = iter->value();
+                auto const& val = iter->value();
                 return std::string_view(val.data(), val.size());
             }
             return std::string_view{};