chore: update command interface for main_service commands

Clean up command_registry interface as well.

Signed-off-by: Roman Gershman <roman@dragonflydb.io>

Author: romange

src/server/command_registry.cc

@@ -96,10 +96,9 @@ bool CommandId::IsMultiTransactional() const {
   return CO::IsTransKind(name()) || CO::IsEvalKind(name());
 }
 
-uint64_t CommandId::Invoke(CmdArgList args, Transaction* tx, facade::SinkReplyBuilder* builder,
-                           ConnectionContext* cntx) const {
+uint64_t CommandId::Invoke(CmdArgList args, const CommandContext& cmd_cntx) const {
   int64_t before = absl::GetCurrentTimeNanos();
-  handler_(args, tx, builder, cntx);
+  handler_(args, cmd_cntx);
   int64_t after = absl::GetCurrentTimeNanos();
 
   ServerState* ss = ServerState::tlocal();  // Might have migrated thread, read after invocation
@@ -133,21 +132,6 @@ optional<facade::ErrorReply> CommandId::Validate(CmdArgList tail_args) const {
   return nullopt;
 }
 
-CommandId&& CommandId::SetHandler(Handler2 f) && {
-  handler_ = [f = std::move(f)](CmdArgList args, Transaction* tx, facade::SinkReplyBuilder* builder,
-                                ConnectionContext*) { f(args, tx, builder); };
-
-  return std::move(*this);
-}
-
-CommandId&& CommandId::SetHandler(Handler3 f) && {
-  handler_ = [f = std::move(f)](CmdArgList args, Transaction* tx, facade::SinkReplyBuilder* builder,
-                                ConnectionContext* cntx) {
-    f(std::move(args), CommandContext{tx, builder, cntx});
-  };
-  return std::move(*this);
-};
-
 CommandRegistry::CommandRegistry() {
   vector<string> rename_command = GetFlag(FLAGS_rename_command);
 

src/server/command_registry.h

@@ -96,23 +96,13 @@ class CommandId : public facade::CommandId {
     command_stats_ = std::make_unique<CmdCallStats[]>(thread_count);
   }
 
-  using Handler =
-      fu2::function_base<true /*owns*/, true /*copyable*/, fu2::capacity_default,
-                         false /* non-throwing*/, false /* strong exceptions guarantees*/,
-                         void(CmdArgList, Transaction*, facade::SinkReplyBuilder*,
-                              ConnectionContext*) const>;
-  using Handler2 =
-      fu2::function_base<true, true, fu2::capacity_default, false, false,
-                         void(CmdArgList, Transaction*, facade::SinkReplyBuilder*) const>;
-
   using Handler3 = fu2::function_base<true, true, fu2::capacity_default, false, false,
                                       void(CmdArgList, const CommandContext&) const>;
   using ArgValidator = fu2::function_base<true, true, fu2::capacity_default, false, false,
                                           std::optional<facade::ErrorReply>(CmdArgList) const>;
 
   // Returns the invoke time in usec.
-  uint64_t Invoke(CmdArgList args, Transaction*, facade::SinkReplyBuilder*,
-                  ConnectionContext* cntx) const;
+  uint64_t Invoke(CmdArgList args, const CommandContext& cmd_cntx) const;
 
   // Returns error if validation failed, otherwise nullopt
   std::optional<facade::ErrorReply> Validate(CmdArgList tail_args) const;
@@ -135,15 +125,11 @@ class CommandId : public facade::CommandId {
 
   static const char* OptName(CO::CommandOpt fl);
 
-  CommandId&& SetHandler(Handler f) && {
+  CommandId&& SetHandler(Handler3 f) && {
     handler_ = std::move(f);
     return std::move(*this);
   }
 
-  CommandId&& SetHandler(Handler2 f) &&;
-
-  CommandId&& SetHandler(Handler3 f) &&;
-
   CommandId&& SetValidator(ArgValidator f) && {
     validator_ = std::move(f);
     return std::move(*this);
@@ -169,7 +155,7 @@ class CommandId : public facade::CommandId {
  private:
   bool implicit_acl_;
   std::unique_ptr<CmdCallStats[]> command_stats_;
-  Handler handler_;
+  Handler3 handler_;
   ArgValidator validator_;
 };