Use WorkerProto::Serialise abstraction for DrvOutput

It's better to consistently use the abstraction, rather than code which
happens to do the same thing.

See also d782c5e for the same sort of
change.

Author: Ericson2314

src/libstore/daemon.cc

@@ -964,7 +964,7 @@ static void performOp(
     case WorkerProto::Op::RegisterDrvOutput: {
         logger->startWork();
         if (GET_PROTOCOL_MINOR(conn.protoVersion) < 31) {
-            auto outputId = DrvOutput::parse(readString(conn.from));
+            auto outputId = WorkerProto::Serialise<DrvOutput>::read(*store, rconn);
             auto outputPath = StorePath(readString(conn.from));
             store->registerDrvOutput(Realisation{{.outPath = outputPath}, outputId});
         } else {
@@ -977,7 +977,7 @@ static void performOp(
 
     case WorkerProto::Op::QueryRealisation: {
         logger->startWork();
-        auto outputId = DrvOutput::parse(readString(conn.from));
+        auto outputId = WorkerProto::Serialise<DrvOutput>::read(*store, rconn);
         auto info = store->queryRealisation(outputId);
         logger->stopWork();
         if (GET_PROTOCOL_MINOR(conn.protoVersion) < 31) {

src/libstore/remote-store.cc

@@ -493,7 +493,7 @@ void RemoteStore::registerDrvOutput(const Realisation & info)
     auto conn(getConnection());
     conn->to << WorkerProto::Op::RegisterDrvOutput;
     if (GET_PROTOCOL_MINOR(conn->protoVersion) < 31) {
-        conn->to << info.id.to_string();
+        WorkerProto::write(*this, *conn, info.id);
         conn->to << std::string(info.outPath.to_string());
     } else {
         WorkerProto::write(*this, *conn, info);
@@ -513,7 +513,7 @@ void RemoteStore::queryRealisationUncached(
         }
 
         conn->to << WorkerProto::Op::QueryRealisation;
-        conn->to << id.to_string();
+        WorkerProto::write(*this, *conn, id);
         conn.processStderr();
 
         auto real = [&]() -> std::shared_ptr<const UnkeyedRealisation> {