[call-v3] Move grpc_call_final_info into its own target (grpc#35504)

We probably want to reconsider this types role in the system, but for now removing it would be a large job. Move it to somewhere isolated for now.

Closes grpc#35504

COPYBARA_INTEGRATE_REVIEW=grpc#35504 from ctiller:move-it-stats 9ee755d
PiperOrigin-RevId: 597382258

BUILD

@@ -1530,6 +1530,7 @@ grpc_cc_library(
         "//src/core:arena_promise",
         "//src/core:atomic_utils",
         "//src/core:bitset",
+        "//src/core:call_final_info",
         "//src/core:cancel_callback",
         "//src/core:channel_args",
         "//src/core:channel_args_endpoint_config",

src/core/BUILD

@@ -6624,6 +6624,20 @@ grpc_cc_library(
     ],
 )
 
+grpc_cc_library(
+    name = "call_final_info",
+    srcs = [
+        "lib/transport/call_final_info.cc",
+    ],
+    hdrs = [
+        "lib/transport/call_final_info.h",
+    ],
+    deps = [
+        "//:gpr",
+        "//:grpc_public_hdrs",
+    ],
+)
+
 grpc_cc_library(
     name = "parsed_metadata",
     srcs = [

src/core/lib/channel/channel_stack.h

@@ -72,6 +72,7 @@
 #include "src/core/lib/iomgr/polling_entity.h"
 #include "src/core/lib/promise/arena_promise.h"
 #include "src/core/lib/resource_quota/arena.h"
+#include "src/core/lib/transport/call_final_info.h"
 #include "src/core/lib/transport/transport.h"
 
 struct grpc_channel_element_args {
@@ -90,16 +91,6 @@ struct grpc_call_element_args {
   grpc_core::Arena* arena;
   grpc_core::CallCombiner* call_combiner;
 };
-struct grpc_call_stats {
-  grpc_transport_stream_stats transport_stream_stats;
-  gpr_timespec latency;  // From call creating to enqueing of received status
-};
-/// Information about the call upon completion.
-struct grpc_call_final_info {
-  grpc_call_stats stats;
-  grpc_status_code final_status = GRPC_STATUS_OK;
-  const char* error_string = nullptr;
-};
 
 // Channel filters specify:
 // 1. the amount of memory needed in the channel & call (via the sizeof_XXX

src/core/lib/transport/call_final_info.cc

@@ -0,0 +1,38 @@
+// Copyright 2024 gRPC authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <grpc/support/port_platform.h>
+
+#include "src/core/lib/transport/call_final_info.h"
+
+#include <utility>
+
+static void move64bits(uint64_t* from, uint64_t* to) {
+  *to += *from;
+  *from = 0;
+}
+
+void grpc_transport_move_one_way_stats(grpc_transport_one_way_stats* from,
+                                       grpc_transport_one_way_stats* to) {
+  move64bits(&from->framing_bytes, &to->framing_bytes);
+  move64bits(&from->data_bytes, &to->data_bytes);
+  move64bits(&from->header_bytes, &to->header_bytes);
+}
+
+void grpc_transport_move_stats(grpc_transport_stream_stats* from,
+                               grpc_transport_stream_stats* to) {
+  grpc_transport_move_one_way_stats(&from->incoming, &to->incoming);
+  grpc_transport_move_one_way_stats(&from->outgoing, &to->outgoing);
+  to->latency = std::exchange(from->latency, gpr_inf_future(GPR_TIMESPAN));
+}

src/core/lib/transport/call_final_info.h

@@ -0,0 +1,54 @@
+// Copyright 2024 gRPC authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef GRPC_SRC_CORE_LIB_TRANSPORT_CALL_FINAL_INFO_H
+#define GRPC_SRC_CORE_LIB_TRANSPORT_CALL_FINAL_INFO_H
+
+#include <grpc/support/port_platform.h>
+
+#include <cstdint>
+
+#include <grpc/status.h>
+#include <grpc/support/time.h>
+
+struct grpc_transport_one_way_stats {
+  uint64_t framing_bytes = 0;
+  uint64_t data_bytes = 0;
+  uint64_t header_bytes = 0;
+};
+
+struct grpc_transport_stream_stats {
+  grpc_transport_one_way_stats incoming;
+  grpc_transport_one_way_stats outgoing;
+  gpr_timespec latency = gpr_inf_future(GPR_TIMESPAN);
+};
+
+void grpc_transport_move_one_way_stats(grpc_transport_one_way_stats* from,
+                                       grpc_transport_one_way_stats* to);
+
+void grpc_transport_move_stats(grpc_transport_stream_stats* from,
+                               grpc_transport_stream_stats* to);
+
+struct grpc_call_stats {
+  grpc_transport_stream_stats transport_stream_stats;
+  gpr_timespec latency;  // From call creating to enqueing of received status
+};
+/// Information about the call upon completion.
+struct grpc_call_final_info {
+  grpc_call_stats stats;
+  grpc_status_code final_status = GRPC_STATUS_OK;
+  const char* error_string = nullptr;
+};
+
+#endif  // GRPC_SRC_CORE_LIB_TRANSPORT_CALL_FINAL_INFO_H

src/core/lib/transport/transport.cc

@@ -86,25 +86,6 @@ void grpc_stream_ref_init(grpc_stream_refcount* refcount, int /*initial_refs*/,
                                                              : nullptr);
 }
 
-static void move64bits(uint64_t* from, uint64_t* to) {
-  *to += *from;
-  *from = 0;
-}
-
-void grpc_transport_move_one_way_stats(grpc_transport_one_way_stats* from,
-                                       grpc_transport_one_way_stats* to) {
-  move64bits(&from->framing_bytes, &to->framing_bytes);
-  move64bits(&from->data_bytes, &to->data_bytes);
-  move64bits(&from->header_bytes, &to->header_bytes);
-}
-
-void grpc_transport_move_stats(grpc_transport_stream_stats* from,
-                               grpc_transport_stream_stats* to) {
-  grpc_transport_move_one_way_stats(&from->incoming, &to->incoming);
-  grpc_transport_move_one_way_stats(&from->outgoing, &to->outgoing);
-  to->latency = std::exchange(from->latency, gpr_inf_future(GPR_TIMESPAN));
-}
-
 namespace grpc_core {
 void Transport::SetPollingEntity(grpc_stream* stream,
                                  grpc_polling_entity* pollset_or_pollset_set) {

src/core/lib/transport/transport.h

@@ -61,6 +61,7 @@
 #include "src/core/lib/promise/status_flag.h"
 #include "src/core/lib/resource_quota/arena.h"
 #include "src/core/lib/slice/slice_buffer.h"
+#include "src/core/lib/transport/call_final_info.h"
 #include "src/core/lib/transport/connectivity_state.h"
 #include "src/core/lib/transport/metadata_batch.h"
 #include "src/core/lib/transport/transport_fwd.h"
@@ -679,24 +680,6 @@ inline void grpc_stream_unref(grpc_stream_refcount* refcount) {
 grpc_slice grpc_slice_from_stream_owned_buffer(grpc_stream_refcount* refcount,
                                                void* buffer, size_t length);
 
-struct grpc_transport_one_way_stats {
-  uint64_t framing_bytes = 0;
-  uint64_t data_bytes = 0;
-  uint64_t header_bytes = 0;
-};
-
-struct grpc_transport_stream_stats {
-  grpc_transport_one_way_stats incoming;
-  grpc_transport_one_way_stats outgoing;
-  gpr_timespec latency = gpr_inf_future(GPR_TIMESPAN);
-};
-
-void grpc_transport_move_one_way_stats(grpc_transport_one_way_stats* from,
-                                       grpc_transport_one_way_stats* to);
-
-void grpc_transport_move_stats(grpc_transport_stream_stats* from,
-                               grpc_transport_stream_stats* to);
-
 // This struct (which is present in both grpc_transport_stream_op_batch
 // and grpc_transport_op_batch) is a convenience to allow filters or
 // transports to schedule a closure related to a particular batch without