chore: get rid of MutableSlice (#3952)

* chore: get rid of MutableSlice

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

* chore: comments

---------

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

src/core/core_types.h

@@ -1,13 +0,0 @@
-// Copyright 2022, DragonflyDB authors.  All rights reserved.
-// See LICENSE for licensing terms.
-//
-
-#pragma once
-
-#include <absl/types/span.h>
-
-namespace dfly {
-using MutableSlice = absl::Span<char>;
-using MutSliceSpan = absl::Span<MutableSlice>;
-
-}  // namespace dfly

src/core/interpreter.cc

@@ -244,7 +244,7 @@ optional<int> FetchKey(lua_State* lua, const char* key) {
   return type;
 }
 
-void SetGlobalArrayInternal(lua_State* lua, const char* name, MutSliceSpan args) {
+void SetGlobalArrayInternal(lua_State* lua, const char* name, Interpreter::SliceSpan args) {
   lua_createtable(lua, args.size(), 0);
   for (size_t j = 0; j < args.size(); j++) {
     lua_pushlstring(lua, args[j].data(), args[j].size());
@@ -652,7 +652,7 @@ auto Interpreter::RunFunction(string_view sha, std::string* error) -> RunResult
   return err == 0 ? RUN_OK : RUN_ERR;
 }
 
-void Interpreter::SetGlobalArray(const char* name, MutSliceSpan args) {
+void Interpreter::SetGlobalArray(const char* name, SliceSpan args) {
   SetGlobalArrayInternal(lua_, name, args);
 }
 
@@ -952,7 +952,7 @@ int Interpreter::RedisGenericCommand(bool raise_error, bool async, ObjectExplore
   }
 
   char name_buffer[32];  // backing storage for cmd name
-  absl::FixedArray<absl::Span<char>, 4> args(argc);
+  absl::FixedArray<string_view, 4> args(argc);
 
   // Copy command name to name_buffer and set it as first arg.
   unsigned name_len = lua_rawlen(lua_, 1);
@@ -1004,7 +1004,7 @@ int Interpreter::RedisGenericCommand(bool raise_error, bool async, ObjectExplore
     explorer = &*translator;
   }
 
-  redis_func_(CallArgs{MutSliceSpan{args}, &buffer_, explorer, async, raise_error, &raise_error});
+  redis_func_(CallArgs{SliceSpan{args}, &buffer_, explorer, async, raise_error, &raise_error});
   cmd_depth_--;
 
   // Shrink reusable buffer if it's too big.

src/core/interpreter.h

@@ -4,11 +4,12 @@
 
 #pragma once
 
+#include <absl/types/span.h>
+
 #include <functional>
 #include <optional>
 #include <string_view>
 
-#include "core/core_types.h"
 #include "util/fibers/synchronization.h"
 
 typedef struct lua_State lua_State;
@@ -40,10 +41,12 @@ class ObjectExplorer {
 
 class Interpreter {
  public:
+  using SliceSpan = absl::Span<const std::string_view>;
+
   // Arguments received from redis.call
   struct CallArgs {
     // Full arguments, including cmd name.
-    MutSliceSpan args;
+    SliceSpan args;
 
     // Pointer to backing storage for args (excluding cmd name).
     // Moving can invalidate arg slice pointers. Moved by async to re-use buffer.
@@ -93,7 +96,7 @@ class Interpreter {
     RUN_ERR = 2,
   };
 
-  void SetGlobalArray(const char* name, MutSliceSpan args);
+  void SetGlobalArray(const char* name, SliceSpan args);
 
   // Runs already added function sha returned by a successful call to AddFunction().
   // Returns: true if the call succeeded, otherwise fills error and returns false.

src/core/interpreter_test.cc

@@ -73,6 +73,7 @@ class TestSerializer : public ObjectExplorer {
   }
 };
 
+using SliceSpan = Interpreter::SliceSpan;
 class InterpreterTest : public ::testing::Test {
  protected:
   InterpreterTest() {
@@ -99,12 +100,12 @@ class InterpreterTest : public ::testing::Test {
 };
 
 void InterpreterTest::SetGlobalArray(const char* name, const vector<string_view>& vec) {
-  vector<MutableSlice> slices(vec.size());
+  vector<string_view> slices(vec.size());
   for (size_t i = 0; i < vec.size(); ++i) {
     strings_.emplace_back(new string(vec[i]));
-    slices[i] = MutableSlice{*strings_.back()};
+    slices[i] = string_view{*strings_.back()};
   }
-  intptr_.SetGlobalArray(name, MutSliceSpan{slices});
+  intptr_.SetGlobalArray(name, SliceSpan{slices});
 }
 
 bool InterpreterTest::Execute(string_view script) {
@@ -329,7 +330,7 @@ TEST_F(InterpreterTest, CallArray) {
 
 TEST_F(InterpreterTest, ArgKeys) {
   vector<string> vec_arr{};
-  vector<MutableSlice> slices;
+  vector<string_view> slices;
   SetGlobalArray("ARGV", {"foo", "bar"});
   SetGlobalArray("KEYS", {"key1", "key2"});
   EXPECT_TRUE(Execute("return {ARGV[1], KEYS[1], KEYS[2]}"));

src/core/search/base.h

@@ -14,7 +14,6 @@
 #include <vector>
 
 #include "base/pmr/memory_resource.h"
-#include "core/core_types.h"
 #include "core/string_map.h"
 
 namespace dfly::search {

src/core/small_string.h

@@ -6,8 +6,6 @@
 #include <cstdint>
 #include <string_view>
 
-#include "core/core_types.h"
-
 namespace dfly {
 
 // blob strings of upto ~256B. Small sizes are probably predominant

src/core/uring.h

@@ -1,19 +0,0 @@
-// Copyright 2023, Roman Gershman.  All rights reserved.
-// See LICENSE for licensing terms.
-//
-
-#pragma once
-
-#ifdef __linux__
-#include "util/fibers/uring_file.h"
-#include "util/fibers/uring_proactor.h"
-namespace dfly {
-
-using util::fb2::FiberCall;
-using util::fb2::LinuxFile;
-using util::fb2::OpenLinux;
-using util::fb2::OpenRead;
-
-}  // namespace dfly
-
-#endif

src/facade/dragonfly_connection.cc

@@ -17,7 +17,6 @@
 #include "base/io_buf.h"
 #include "base/logging.h"
 #include "core/heap_size.h"
-#include "core/uring.h"
 #include "facade/conn_context.h"
 #include "facade/dragonfly_listener.h"
 #include "facade/memcache_parser.h"
@@ -30,6 +29,10 @@
 #include "util/tls/tls_socket.h"
 #endif
 
+#ifdef __linux__
+#include "util/fibers/uring_file.h"
+#endif
+
 using namespace std;
 using facade::operator""_MB;
 
@@ -1341,7 +1344,7 @@ bool Connection::ShouldEndDispatchFiber(const MessageHandle& msg) {
 void Connection::SquashPipeline() {
   DCHECK_EQ(dispatch_q_.size(), pending_pipeline_cmd_cnt_);
 
-  vector<CmdArgList> squash_cmds;
+  vector<ArgSlice> squash_cmds;
   squash_cmds.reserve(dispatch_q_.size());
 
   for (auto& msg : dispatch_q_) {

src/facade/dragonfly_connection.h

@@ -91,7 +91,7 @@ class Connection : public util::Connection {
     // The capacity is chosen so that we allocate a fully utilized (256 bytes) block.
     using StorageType = absl::InlinedVector<char, kReqStorageSize, mi_stl_allocator<char>>;
 
-    absl::InlinedVector<MutableSlice, 6> args;
+    absl::InlinedVector<std::string_view, 6> args;
     StorageType storage;
   };
 

src/facade/facade_types.h

@@ -35,16 +35,12 @@ constexpr size_t kSanitizerOverhead = 0u;
 
 enum class Protocol : uint8_t { MEMCACHE = 1, REDIS = 2 };
 
-using MutableSlice = absl::Span<char>;
-using CmdArgList = absl::Span<MutableSlice>;
-using CmdArgVec = std::vector<MutableSlice>;
+using MutableSlice = std::string_view;
+using CmdArgList = absl::Span<const std::string_view>;
+using CmdArgVec = std::vector<std::string_view>;
 using ArgSlice = absl::Span<const std::string_view>;
 using OwnedArgSlice = absl::Span<const std::string>;
 
-inline std::string_view ToSV(MutableSlice slice) {
-  return std::string_view{slice.data(), slice.size()};
-}
-
 inline std::string_view ToSV(std::string_view slice) {
   return slice;
 }
@@ -57,13 +53,8 @@ inline std::string_view ToSV(std::string&& slice) = delete;
 
 constexpr auto kToSV = [](auto&& v) { return ToSV(std::forward<decltype(v)>(v)); };
 
-inline std::string_view ArgS(CmdArgList args, size_t i) {
-  auto arg = args[i];
-  return {arg.data(), arg.size()};
-}
-
-inline auto ArgS(CmdArgList args) {
-  return base::it::Transform(kToSV, base::it::Range{args.begin(), args.end()});
+inline std::string_view ArgS(ArgSlice args, size_t i) {
+  return args[i];
 }
 
 struct ArgRange {
@@ -95,7 +86,7 @@ struct ArgRange {
     return std::visit([idx](const auto& span) { return facade::ToSV(span[idx]); }, span);
   }
 
-  std::variant<CmdArgList, ArgSlice, OwnedArgSlice> span;
+  std::variant<ArgSlice, OwnedArgSlice> span;
 };
 struct ConnectionStats {
   size_t read_buf_capacity = 0;                // total capacity of input buffers
@@ -179,10 +170,6 @@ struct ErrorReply {
   std::optional<OpStatus> status{std::nullopt};
 };
 
-inline MutableSlice ToMSS(absl::Span<uint8_t> span) {
-  return MutableSlice{reinterpret_cast<char*>(span.data()), span.size()};
-}
-
 constexpr inline unsigned long long operator""_MB(unsigned long long x) {
   return 1024L * 1024L * x;
 }

src/facade/ok_main.cc

@@ -21,11 +21,11 @@ namespace {
 
 class OkService : public ServiceInterface {
  public:
-  void DispatchCommand(CmdArgList args, ConnectionContext* cntx) final {
+  void DispatchCommand(ArgSlice args, ConnectionContext* cntx) final {
     cntx->SendOk();
   }
 
-  size_t DispatchManyCommands(absl::Span<CmdArgList> args_lists, ConnectionContext* cntx) final {
+  size_t DispatchManyCommands(absl::Span<ArgSlice> args_lists, ConnectionContext* cntx) final {
     for (auto args : args_lists)
       DispatchCommand(args, cntx);
     return args_lists.size();

src/facade/resp_expr.cc

@@ -13,7 +13,7 @@ void RespExpr::VecToArgList(const Vec& src, CmdArgVec* dest) {
   for (size_t i = 0; i < src.size(); ++i) {
     DCHECK(src[i].type == RespExpr::STRING);
 
-    (*dest)[i] = ToMSS(src[i].GetBuf());
+    (*dest)[i] = ToSV(src[i].GetBuf());
   }
 }
 

src/facade/service_interface.h

@@ -25,11 +25,10 @@ class ServiceInterface {
   virtual ~ServiceInterface() {
   }
 
-  virtual void DispatchCommand(CmdArgList args, ConnectionContext* cntx) = 0;
+  virtual void DispatchCommand(ArgSlice args, ConnectionContext* cntx) = 0;
 
   // Returns number of processed commands
-  virtual size_t DispatchManyCommands(absl::Span<CmdArgList> args_list,
-                                      ConnectionContext* cntx) = 0;
+  virtual size_t DispatchManyCommands(absl::Span<ArgSlice> args_list, ConnectionContext* cntx) = 0;
 
   virtual void DispatchMC(const MemcacheParser::Command& cmd, std::string_view value,
                           ConnectionContext* cntx) = 0;

src/server/acl/validator.cc

@@ -18,7 +18,7 @@ extern "C" {
 namespace dfly::acl {
 
 [[nodiscard]] bool IsUserAllowedToInvokeCommand(const ConnectionContext& cntx, const CommandId& id,
-                                                CmdArgList tail_args) {
+                                                ArgSlice tail_args) {
   if (cntx.skip_acl_validation) {
     return true;
   }

src/server/command_registry.cc

@@ -189,8 +189,8 @@ CommandRegistry::FamiliesVec CommandRegistry::GetFamilies() {
   return std::move(family_of_commands_);
 }
 
-std::pair<const CommandId*, CmdArgList> CommandRegistry::FindExtended(string_view cmd,
-                                                                      CmdArgList tail_args) const {
+std::pair<const CommandId*, ArgSlice> CommandRegistry::FindExtended(string_view cmd,
+                                                                    ArgSlice tail_args) const {
   if (cmd == RenamedOrOriginal("ACL"sv)) {
     if (tail_args.empty()) {
       return {Find(cmd), {}};

src/server/command_registry.h

@@ -203,8 +203,8 @@ class CommandRegistry {
   using FamiliesVec = std::vector<std::vector<std::string>>;
   FamiliesVec GetFamilies();
 
-  std::pair<const CommandId*, facade::CmdArgList> FindExtended(std::string_view cmd,
-                                                               facade::CmdArgList tail_args) const;
+  std::pair<const CommandId*, facade::ArgSlice> FindExtended(std::string_view cmd,
+                                                             facade::ArgSlice tail_args) const;
 
  private:
   absl::flat_hash_map<std::string, CommandId> cmd_map_;

src/server/conn_context.cc

@@ -21,7 +21,7 @@ namespace dfly {
 using namespace std;
 using namespace facade;
 
-StoredCmd::StoredCmd(const CommandId* cid, CmdArgList args, facade::ReplyMode mode)
+StoredCmd::StoredCmd(const CommandId* cid, ArgSlice args, facade::ReplyMode mode)
     : cid_{cid}, buffer_{}, sizes_(args.size()), reply_mode_{mode} {
   size_t total_size = 0;
   for (auto args : args) {
@@ -38,7 +38,7 @@ StoredCmd::StoredCmd(const CommandId* cid, CmdArgList args, facade::ReplyMode mo
   }
 }
 
-StoredCmd::StoredCmd(string&& buffer, const CommandId* cid, CmdArgList args, facade::ReplyMode mode)
+StoredCmd::StoredCmd(string&& buffer, const CommandId* cid, ArgSlice args, facade::ReplyMode mode)
     : cid_{cid}, buffer_{std::move(buffer)}, sizes_(args.size()), reply_mode_{mode} {
   for (unsigned i = 0; i < args.size(); i++) {
     // Assume tightly packed list.
@@ -47,7 +47,7 @@ StoredCmd::StoredCmd(string&& buffer, const CommandId* cid, CmdArgList args, fac
   }
 }
 
-void StoredCmd::Fill(CmdArgList args) {
+void StoredCmd::Fill(absl::Span<std::string_view> args) {
   DCHECK_GE(args.size(), sizes_.size());
 
   unsigned offset = 0;
@@ -162,7 +162,7 @@ vector<unsigned> ChangeSubscriptions(bool pattern, CmdArgList args, bool to_add,
 
   // Gather all the channels we need to subscribe to / remove.
   size_t i = 0;
-  for (string_view channel : ArgS(args)) {
+  for (string_view channel : args) {
     if (to_add && local_store.emplace(channel).second)
       csu.Record(channel);
     else if (!to_add && local_store.erase(channel) > 0)

src/server/conn_context.h

@@ -27,11 +27,10 @@ struct FlowInfo;
 // Used for storing MULTI/EXEC commands.
 class StoredCmd {
  public:
-  StoredCmd(const CommandId* cid, CmdArgList args,
-            facade::ReplyMode mode = facade::ReplyMode::FULL);
+  StoredCmd(const CommandId* cid, ArgSlice args, facade::ReplyMode mode = facade::ReplyMode::FULL);
 
   // Create on top of already filled tightly-packed buffer.
-  StoredCmd(std::string&& buffer, const CommandId* cid, CmdArgList args,
+  StoredCmd(std::string&& buffer, const CommandId* cid, ArgSlice args,
             facade::ReplyMode mode = facade::ReplyMode::FULL);
 
   size_t NumArgs() const;
@@ -40,7 +39,7 @@ class StoredCmd {
 
   // Fill the arg list with stored arguments, it should be at least of size NumArgs().
   // Between filling and invocation, cmd should NOT be moved.
-  void Fill(CmdArgList args);
+  void Fill(absl::Span<std::string_view> args);
 
   void Fill(CmdArgVec* dest) {
     dest->resize(sizes_.size());

src/server/debugcmd.cc

@@ -145,7 +145,7 @@ void DoPopulateBatch(string_view type, string_view prefix, size_t val_size, bool
   local_tx->StartMultiNonAtomic();
   boost::intrusive_ptr<Transaction> stub_tx =
       new Transaction{local_tx.get(), EngineShard::tlocal()->shard_id(), nullopt};
-  absl::InlinedVector<MutableSlice, 5> args_view;
+  absl::InlinedVector<string_view, 5> args_view;
   facade::CapturingReplyBuilder crb;
   ConnectionContext local_cntx{cntx, stub_tx.get(), &crb};
 
@@ -162,7 +162,7 @@ void DoPopulateBatch(string_view type, string_view prefix, size_t val_size, bool
 
     args_view.clear();
     for (auto& arg : args) {
-      args_view.push_back(absl::MakeSpan(arg));
+      args_view.push_back(arg);
     }
     auto args_span = absl::MakeSpan(args_view);
 

src/server/http_api.cc

@@ -219,9 +219,9 @@ void HttpAPI(const http::QueryArgs& args, HttpRequest&& req, Service* service,
   for (size_t i = 0; i < vec.size(); ++i) {
     cmd_args.push_back(vec[i].AsString().c_str());
   }
-  vector<facade::MutableSlice> cmd_slices(cmd_args.size());
+  vector<string_view> cmd_slices(cmd_args.size());
   for (size_t i = 0; i < cmd_args.size(); ++i) {
-    cmd_slices[i] = absl::MakeSpan(cmd_args[i]);
+    cmd_slices[i] = cmd_args[i];
   }
 
   facade::ConnectionContext* context = (facade::ConnectionContext*)http_cntx->user_data();

src/server/journal/executor.cc

@@ -23,13 +23,13 @@ template <typename... Ts> journal::ParsedEntry::CmdData BuildFromParts(Ts... par
   vector<string> raw_parts{absl::StrCat(std::forward<Ts>(parts))...};
 
   auto cmd_str = accumulate(raw_parts.begin(), raw_parts.end(), std::string{});
-  auto buf = make_unique<char[]>(cmd_str.size());
+  auto buf = make_unique<uint8_t[]>(cmd_str.size());
   memcpy(buf.get(), cmd_str.data(), cmd_str.size());
 
-  CmdArgVec slice_parts{};
+  CmdArgVec slice_parts;
   size_t start = 0;
   for (const auto& part : raw_parts) {
-    slice_parts.emplace_back(buf.get() + start, part.size());
+    slice_parts.emplace_back(reinterpret_cast<char*>(buf.get()) + start, part.size());
     start += part.size();
   }
 

src/server/journal/serializer.cc

@@ -140,7 +140,7 @@ template io::Result<uint16_t> JournalReader::ReadUInt<uint16_t>();
 template io::Result<uint32_t> JournalReader::ReadUInt<uint32_t>();
 template io::Result<uint64_t> JournalReader::ReadUInt<uint64_t>();
 
-io::Result<size_t> JournalReader::ReadString(MutableSlice buffer) {
+io::Result<size_t> JournalReader::ReadString(io::MutableBytes buffer) {
   size_t size = 0;
   SET_OR_UNEXPECT(ReadUInt<uint64_t>(), size);
 
@@ -164,17 +164,17 @@ std::error_code JournalReader::ReadCommand(journal::ParsedEntry::CmdData* data)
   SET_OR_RETURN(ReadUInt<uint64_t>(), cmd_size);
 
   // Read all strings consecutively.
-  data->command_buf = make_unique<char[]>(cmd_size);
-  char* ptr = data->command_buf.get();
+  data->command_buf = make_unique<uint8_t[]>(cmd_size);
+  uint8_t* ptr = data->command_buf.get();
   for (auto& span : data->cmd_args) {
     size_t size;
     SET_OR_RETURN(ReadString({ptr, cmd_size}), size);
     DCHECK(size <= cmd_size);
-    span = MutableSlice{ptr, size};
+    span = string_view{reinterpret_cast<char*>(ptr), size};
     ptr += size;
     cmd_size -= size;
   }
-  return std::error_code{};
+  return {};
 }
 
 io::Result<journal::ParsedEntry> JournalReader::ReadEntry() {

src/server/journal/serializer.h

@@ -26,10 +26,6 @@ class JournalWriter {
 
  private:
   void Write(std::string_view sv);  // Write string.
-  void Write(facade::MutableSlice slice) {
-    Write(facade::ToSV(slice));
-  }
-
   void Write(const journal::Entry::Payload& payload);
 
  private:
@@ -58,7 +54,7 @@ struct JournalReader {
   template <typename UT> io::Result<UT> ReadUInt();
 
   // Read and copy to buffer, return size.
-  io::Result<size_t> ReadString(MutableSlice buffer);
+  io::Result<size_t> ReadString(io::MutableBytes buffer);
 
   // Read argument array into string buffer.
   std::error_code ReadCommand(journal::ParsedEntry::CmdData* entry);

src/server/journal/types.h

@@ -39,14 +39,12 @@ struct Entry : public EntryBase {
   // Payload represents a non-owning view into a command executed on the shard.
   struct Payload {
     std::string_view cmd;
-    std::variant<CmdArgList,  // Parts of a full command.
-                 ShardArgs,   // Shard parts.
-                 ArgSlice>
+    std::variant<ShardArgs,  // Shard parts.
+                 ArgSlice>   // Parts of a full command.
         args;
 
     Payload() = default;
-    Payload(std::string_view c, CmdArgList a) : cmd(c), args(a) {
-    }
+
     Payload(std::string_view c, const ShardArgs& a) : cmd(c), args(a) {
     }
     Payload(std::string_view c, ArgSlice a) : cmd(c), args(a) {
@@ -81,7 +79,7 @@ struct Entry : public EntryBase {
 
 struct ParsedEntry : public EntryBase {
   struct CmdData {
-    std::unique_ptr<char[]> command_buf;
+    std::unique_ptr<uint8_t[]> command_buf;
     CmdArgVec cmd_args;  // represents the parsed command.
   };
   CmdData cmd;

src/server/main_service.cc

@@ -1092,7 +1092,7 @@ optional<ErrorReply> CheckKeysDeclared(const ConnectionState::ScriptInfo& eval_i
 
 static optional<ErrorReply> VerifyConnectionAclStatus(const CommandId* cid,
                                                       const ConnectionContext* cntx,
-                                                      string_view error_msg, CmdArgList tail_args) {
+                                                      string_view error_msg, ArgSlice tail_args) {
   // If we are on a squashed context we need to use the owner, because the
   // context we are operating on is a stub and the acl username is not copied
   // See: MultiCommandSquasher::SquashedHopCb
@@ -1238,7 +1238,7 @@ std::optional<ErrorReply> Service::VerifyCommandState(const CommandId* cid, CmdA
   return VerifyConnectionAclStatus(cid, &dfly_cntx, "has no ACL permissions", tail_args);
 }
 
-void Service::DispatchCommand(CmdArgList args, facade::ConnectionContext* cntx) {
+void Service::DispatchCommand(ArgSlice args, facade::ConnectionContext* cntx) {
   absl::Cleanup clear_last_error(
       [cntx]() { std::ignore = cntx->reply_builder()->ConsumeLastError(); });
   DCHECK(!args.empty());
@@ -1246,7 +1246,7 @@ void Service::DispatchCommand(CmdArgList args, facade::ConnectionContext* cntx)
 
   ServerState& etl = *ServerState::tlocal();
 
-  string cmd = absl::AsciiStrToUpper(ArgS(args, 0));
+  string cmd = absl::AsciiStrToUpper(args[0]);
   const auto [cid, args_no_cmd] = registry_.FindExtended(cmd, args.subspan(1));
 
   if (cid == nullptr) {
@@ -1793,7 +1793,7 @@ void Service::Watch(CmdArgList args, ConnectionContext* cntx) {
 
   // Duplicate keys are stored to keep correct count.
   exec_info.watched_existed += keys_existed.load(memory_order_relaxed);
-  for (std::string_view key : ArgS(args)) {
+  for (string_view key : args) {
     exec_info.watched_keys.emplace_back(cntx->db_index(), key);
   }
 
@@ -1840,7 +1840,7 @@ optional<CapturingReplyBuilder::Payload> Service::FlushEvalAsyncCmds(ConnectionC
 
 void Service::CallFromScript(ConnectionContext* cntx, Interpreter::CallArgs& ca) {
   DCHECK(cntx->transaction);
-  DVLOG(2) << "CallFromScript " << ArgS(ca.args, 0);
+  DVLOG(2) << "CallFromScript " << ca.args[0];
 
   InterpreterReplier replier(ca.translator);
   facade::SinkReplyBuilder* orig = cntx->Inject(&replier);
@@ -1850,7 +1850,7 @@ void Service::CallFromScript(ConnectionContext* cntx, Interpreter::CallArgs& ca)
 
   if (ca.async) {
     auto& info = cntx->conn_state.script_info;
-    string cmd = absl::AsciiStrToUpper(ArgS(ca.args, 0));
+    string cmd = absl::AsciiStrToUpper(ca.args[0]);
 
     // Full command verification happens during squashed execution
     if (auto* cid = registry_.Find(cmd); cid != nullptr) {
@@ -1858,7 +1858,7 @@ void Service::CallFromScript(ConnectionContext* cntx, Interpreter::CallArgs& ca)
       info->async_cmds.emplace_back(std::move(*ca.buffer), cid, ca.args.subspan(1), replies);
       info->async_cmds_heap_mem += info->async_cmds.back().UsedMemory();
     } else if (ca.error_abort) {  // If we don't abort on errors, we can ignore it completely
-      findcmd_err = ReportUnknownCmd(ArgS(ca.args, 0));
+      findcmd_err = ReportUnknownCmd(ca.args[0]);
     }
   }
 
@@ -2421,7 +2421,7 @@ void Service::PubsubNumSub(CmdArgList args, ConnectionContext* cntx) {
   auto* rb = static_cast<RedisReplyBuilder*>(cntx->reply_builder());
   rb->StartArray(args.size() * 2);
 
-  for (string_view channel : ArgS(args)) {
+  for (string_view channel : args) {
     rb->SendBulkString(channel);
     rb->SendLong(ServerState::tlocal()->channel_store()->FetchSubscribers(channel).size());
   }

src/server/main_service.h

@@ -37,10 +37,10 @@ class Service : public facade::ServiceInterface {
   void Shutdown();
 
   // Prepare command execution, verify and execute, reply to context
-  void DispatchCommand(CmdArgList args, facade::ConnectionContext* cntx) final;
+  void DispatchCommand(ArgSlice args, facade::ConnectionContext* cntx) final;
 
   // Execute multiple consecutive commands, possibly in parallel by squashing
-  size_t DispatchManyCommands(absl::Span<CmdArgList> args_list,
+  size_t DispatchManyCommands(absl::Span<ArgSlice> args_list,
                               facade::ConnectionContext* cntx) final;
 
   // Check VerifyCommandExecution and invoke command with args
@@ -55,7 +55,7 @@ class Service : public facade::ServiceInterface {
   // Verify command prepares excution in correct state.
   // It's usually called before command execution. Only for multi/exec transactions it's checked
   // when the command is queued for execution, not before the execution itself.
-  std::optional<facade::ErrorReply> VerifyCommandState(const CommandId* cid, CmdArgList tail_args,
+  std::optional<facade::ErrorReply> VerifyCommandState(const CommandId* cid, ArgSlice tail_args,
                                                        const ConnectionContext& cntx);
 
   void DispatchMC(const MemcacheParser::Command& cmd, std::string_view value,

src/server/server_family.cc

@@ -246,7 +246,7 @@ struct CmdArgListFormatter {
 
 string UnknownCmd(string cmd, CmdArgList args) {
   return absl::StrCat("unknown command '", cmd, "' with args beginning with: ",
-                      StrJoin(args.begin(), args.end(), ", ", CmdArgListFormatter()));
+                      absl::StrJoin(args.begin(), args.end(), ", ", CmdArgListFormatter()));
 }
 
 bool IsCloudPath(string_view path) {

src/server/set_family.cc

@@ -43,7 +43,7 @@ using SetType = pair<void*, unsigned>;
 namespace {
 
 // Possible sources of new set entries
-using NewEntries = std::variant<CmdArgList, ArgSlice, absl::flat_hash_set<std::string_view>>;
+using NewEntries = std::variant<ArgSlice, absl::flat_hash_set<std::string_view>>;
 
 auto EntriesRange(const NewEntries& entries) {
   return base::it::Wrap(facade::kToSV, entries);

src/server/stream_family.cc

@@ -2556,12 +2556,19 @@ void StreamFamily::XPending(CmdArgList args, ConnectionContext* cntx) {
 }
 
 void StreamFamily::XRange(CmdArgList args, ConnectionContext* cntx) {
-  XRangeGeneric(std::move(args), false, cntx);
+  string_view key = args[0];
+  string_view start = args[1];
+  string_view end = args[2];
+
+  XRangeGeneric(key, start, end, args.subspan(3), false, cntx);
 }
 
 void StreamFamily::XRevRange(CmdArgList args, ConnectionContext* cntx) {
-  swap(args[1], args[2]);
-  XRangeGeneric(std::move(args), true, cntx);
+  string_view key = args[0];
+  string_view start = args[1];
+  string_view end = args[2];
+
+  XRangeGeneric(key, end, start, args.subspan(3), true, cntx);
 }
 
 std::optional<ReadOpts> ParseReadArgsOrReply(CmdArgList args, bool read_group,
@@ -3048,10 +3055,8 @@ void StreamFamily::XTrim(CmdArgList args, ConnectionContext* cntx) {
   return cntx->SendError(trim_result.status());
 }
 
-void StreamFamily::XRangeGeneric(CmdArgList args, bool is_rev, ConnectionContext* cntx) {
-  string_view key = ArgS(args, 0);
-  string_view start = ArgS(args, 1);
-  string_view end = ArgS(args, 2);
+void StreamFamily::XRangeGeneric(std::string_view key, std::string_view start, std::string_view end,
+                                 CmdArgList args, bool is_rev, ConnectionContext* cntx) {
   RangeOpts range_opts;
   RangeId rs, re;
   if (!ParseRangeId(start, &rs) || !ParseRangeId(end, &re)) {
@@ -3066,13 +3071,13 @@ void StreamFamily::XRangeGeneric(CmdArgList args, bool is_rev, ConnectionContext
     return cntx->SendError("invalid end ID for the interval", kSyntaxErrType);
   }
 
-  if (args.size() > 3) {
-    if (args.size() != 5) {
+  if (args.size() > 0) {
+    if (args.size() != 2) {
       return cntx->SendError(WrongNumArgsError("XRANGE"), kSyntaxErrType);
     }
 
-    string opt = absl::AsciiStrToUpper(ArgS(args, 3));
-    string_view val = ArgS(args, 4);
+    string opt = absl::AsciiStrToUpper(ArgS(args, 0));
+    string_view val = ArgS(args, 1);
 
     if (opt != "COUNT" || !absl::SimpleAtoi(val, &range_opts.count)) {
       return cntx->SendError(kSyntaxErr);

src/server/stream_family.h

@@ -29,7 +29,8 @@ class StreamFamily {
   static void XReadGroup(CmdArgList args, ConnectionContext* cntx);
   static void XSetId(CmdArgList args, ConnectionContext* cntx);
   static void XTrim(CmdArgList args, ConnectionContext* cntx);
-  static void XRangeGeneric(CmdArgList args, bool is_rev, ConnectionContext* cntx);
+  static void XRangeGeneric(std::string_view key, std::string_view start, std::string_view end,
+                            CmdArgList args, bool is_rev, ConnectionContext* cntx);
   static void XAck(CmdArgList args, ConnectionContext* cntx);
   static void XAutoClaim(CmdArgList args, ConnectionContext* cntx);
 };

src/server/transaction.cc

@@ -296,7 +296,7 @@ void Transaction::PrepareMultiFps(CmdArgList keys) {
   auto& tag_fps = multi_->tag_fps;
 
   tag_fps.reserve(keys.size());
-  for (string_view str : ArgS(keys)) {
+  for (string_view str : keys) {
     ShardId sid = Shard(str, shard_set->size());
     tag_fps.emplace(sid, LockTag(str).Fingerprint());
   }
@@ -474,7 +474,7 @@ void Transaction::StartMultiLockedAhead(Namespace* ns, DbIndex dbid, CmdArgList
   if (!skip_scheduling)
     ScheduleInternal();
 
-  full_args_ = {nullptr, 0};  // InitBase set it to temporary keys, now we reset it.
+  full_args_ = {};  // InitBase set it to temporary keys, now we reset it.
 }
 
 void Transaction::StartMultiNonAtomic() {

src/server/tx_base.cc

@@ -75,15 +75,6 @@ void TriggerJournalWriteToSink() {
   journal->RecordEntry(0, journal::Op::NOOP, 0, 0, nullopt, {}, true);
 }
 
-std::ostream& operator<<(std::ostream& os, ArgSlice list) {
-  os << "[";
-  if (!list.empty()) {
-    std::for_each(list.begin(), list.end() - 1, [&os](const auto& val) { os << val << ", "; });
-    os << (*(list.end() - 1));
-  }
-  return os << "]";
-}
-
 LockTag::LockTag(std::string_view key) {
   if (LockTagOptions::instance().enabled)
     str_ = LockTagOptions::instance().Tag(key);

src/server/tx_base.h

@@ -230,6 +230,6 @@ void RecordExpiry(DbIndex dbid, std::string_view key);
 // Must be called from shard thread of journal to sink.
 void TriggerJournalWriteToSink();
 
-std::ostream& operator<<(std::ostream& os, ArgSlice list);
+// std::ostream& operator<<(std::ostream& os, ArgSlice list);
 
 }  // namespace dfly