[PH2][Refactor][is_client] Split functions (#37641)

[PH2][Refactor][is_client] Split two functions for better readability
1. send_initial_metadata_locked - Moved out the tracing part
2. grpc_chttp2_config_default_keepalive_args - Split the client and server path to reduce cyclomatic complexity.

Closes #37641

COPYBARA_INTEGRATE_REVIEW=https://github.com/grpc/grpc/pull/37641 from tanvi-jagtap:remove_is_client_02 bfbc9361db
PiperOrigin-RevId: 678096501

src/core/ext/transport/chttp2/transport/chttp2_transport.cc

@@ -1361,10 +1361,7 @@ static void log_metadata(const grpc_metadata_batch* md_batch, uint32_t id,
   });
 }
 
-static void send_initial_metadata_locked(
-    grpc_transport_stream_op_batch* op, grpc_chttp2_stream* s,
-    grpc_transport_stream_op_batch_payload* op_payload,
-    grpc_chttp2_transport* t, grpc_closure* on_complete) {
+static void trace_annotations(grpc_chttp2_stream* s) {
   if (!grpc_core::IsCallTracerInTransportEnabled()) {
     if (s->call_tracer != nullptr) {
       s->call_tracer->RecordAnnotation(
@@ -1383,6 +1380,13 @@ static void send_initial_metadata_locked(
               .Add(s->flow_control.stats()));
     }
   }
+}
+
+static void send_initial_metadata_locked(
+    grpc_transport_stream_op_batch* op, grpc_chttp2_stream* s,
+    grpc_transport_stream_op_batch_payload* op_payload,
+    grpc_chttp2_transport* t, grpc_closure* on_complete) {
+  trace_annotations(s);
   if (t->is_client && t->channelz_socket != nullptr) {
     t->channelz_socket->RecordStreamStartedFromLocal();
   }
@@ -2915,48 +2919,48 @@ static void next_bdp_ping_timer_expired_locked(
 }
 
 void grpc_chttp2_config_default_keepalive_args(grpc_channel_args* args,
-                                               bool is_client) {
+                                               const bool is_client) {
   grpc_chttp2_config_default_keepalive_args(grpc_core::ChannelArgs::FromC(args),
                                             is_client);
 }
 
-void grpc_chttp2_config_default_keepalive_args(
-    const grpc_core::ChannelArgs& channel_args, bool is_client) {
-  const auto keepalive_time =
+static void grpc_chttp2_config_default_keepalive_args_client(
+    const grpc_core::ChannelArgs& channel_args) {
+  g_default_client_keepalive_time =
       std::max(grpc_core::Duration::Milliseconds(1),
                channel_args.GetDurationFromIntMillis(GRPC_ARG_KEEPALIVE_TIME_MS)
-                   .value_or(is_client ? g_default_client_keepalive_time
-                                       : g_default_server_keepalive_time));
-  if (is_client) {
-    g_default_client_keepalive_time = keepalive_time;
-  } else {
-    g_default_server_keepalive_time = keepalive_time;
-  }
-
-  const auto keepalive_timeout = std::max(
+                   .value_or(g_default_client_keepalive_time));
+  g_default_client_keepalive_timeout = std::max(
       grpc_core::Duration::Zero(),
       channel_args.GetDurationFromIntMillis(GRPC_ARG_KEEPALIVE_TIMEOUT_MS)
-          .value_or(is_client ? g_default_client_keepalive_timeout
-                              : g_default_server_keepalive_timeout));
-  if (is_client) {
-    g_default_client_keepalive_timeout = keepalive_timeout;
-  } else {
-    g_default_server_keepalive_timeout = keepalive_timeout;
-  }
+          .value_or(g_default_client_keepalive_timeout));
+  g_default_client_keepalive_permit_without_calls =
+      channel_args.GetBool(GRPC_ARG_KEEPALIVE_PERMIT_WITHOUT_CALLS)
+          .value_or(g_default_client_keepalive_permit_without_calls);
+}
 
-  const bool keepalive_permit_without_calls =
+static void grpc_chttp2_config_default_keepalive_args_server(
+    const grpc_core::ChannelArgs& channel_args) {
+  g_default_server_keepalive_time =
+      std::max(grpc_core::Duration::Milliseconds(1),
+               channel_args.GetDurationFromIntMillis(GRPC_ARG_KEEPALIVE_TIME_MS)
+                   .value_or(g_default_server_keepalive_time));
+  g_default_server_keepalive_timeout = std::max(
+      grpc_core::Duration::Zero(),
+      channel_args.GetDurationFromIntMillis(GRPC_ARG_KEEPALIVE_TIMEOUT_MS)
+          .value_or(g_default_server_keepalive_timeout));
+  g_default_server_keepalive_permit_without_calls =
       channel_args.GetBool(GRPC_ARG_KEEPALIVE_PERMIT_WITHOUT_CALLS)
-          .value_or(is_client
-                        ? g_default_client_keepalive_permit_without_calls
-                        : g_default_server_keepalive_permit_without_calls);
+          .value_or(g_default_server_keepalive_permit_without_calls);
+}
+
+void grpc_chttp2_config_default_keepalive_args(
+    const grpc_core::ChannelArgs& channel_args, const bool is_client) {
   if (is_client) {
-    g_default_client_keepalive_permit_without_calls =
-        keepalive_permit_without_calls;
+    grpc_chttp2_config_default_keepalive_args_client(channel_args);
   } else {
-    g_default_server_keepalive_permit_without_calls =
-        keepalive_permit_without_calls;
+    grpc_chttp2_config_default_keepalive_args_server(channel_args);
   }
-
   grpc_core::Chttp2PingAbusePolicy::SetDefaults(channel_args);
   grpc_core::Chttp2PingRatePolicy::SetDefaults(channel_args);
 }