[transport] Centralize ref-counting between transports

src/core/ext/transport/chaotic_good/client_transport.h

@@ -85,7 +85,7 @@ class ChaoticGoodClientTransport final : public ClientTransport {
   grpc_endpoint* GetEndpoint() override { return nullptr; }
   void Orphan() override {
     AbortWithError();
-    delete this;
+    Unref();
   }
 
   void StartCall(CallHandler call_handler) override;

src/core/ext/transport/chaotic_good/server_transport.h

@@ -96,7 +96,7 @@ class ChaoticGoodServerTransport final : public ServerTransport {
   void SetPollsetSet(grpc_stream*, grpc_pollset_set*) override {}
   void PerformOp(grpc_transport_op*) override;
   grpc_endpoint* GetEndpoint() override { return nullptr; }
-  void Orphan() override { delete this; }
+  void Orphan() override { Unref(); }
 
   void SetAcceptor(Acceptor* acceptor) override;
   void AbortWithError();

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

@@ -142,8 +142,6 @@ static bool g_default_server_keepalive_permit_without_calls = false;
 
 #define MAX_CLIENT_STREAM_ID 0x7fffffffu
 grpc_core::TraceFlag grpc_keepalive_trace(false, "http_keepalive");
-grpc_core::DebugOnlyTraceFlag grpc_trace_chttp2_refcount(false,
-                                                         "chttp2_refcount");
 
 // forward declarations of various callbacks that we'll build closures around
 static void write_action_begin_locked(
@@ -594,12 +592,7 @@ static void init_keepalive_pings_if_enabled_locked(
 grpc_chttp2_transport::grpc_chttp2_transport(
     const grpc_core::ChannelArgs& channel_args, grpc_endpoint* ep,
     bool is_client)
-    : grpc_core::RefCounted<grpc_chttp2_transport,
-                            grpc_core::NonPolymorphicRefCount>(
-          GRPC_TRACE_FLAG_ENABLED(grpc_trace_chttp2_refcount)
-              ? "chttp2_refcount"
-              : nullptr),
-      ep(ep),
+    : ep(ep),
       peer_string(
           grpc_core::Slice::FromCopiedString(grpc_endpoint_get_peer(ep))),
       memory_owner(channel_args.GetObject<grpc_core::ResourceQuota>()

src/core/ext/transport/chttp2/transport/internal.h

@@ -223,17 +223,19 @@ typedef enum {
   GRPC_CHTTP2_KEEPALIVE_STATE_DISABLED,
 } grpc_chttp2_keepalive_state;
 
-struct grpc_chttp2_transport final
-    : public grpc_core::FilterStackTransport,
-      public grpc_core::RefCounted<grpc_chttp2_transport,
-                                   grpc_core::NonPolymorphicRefCount>,
-      public grpc_core::KeepsGrpcInitialized {
+struct grpc_chttp2_transport final : public grpc_core::FilterStackTransport,
+                                     public grpc_core::KeepsGrpcInitialized {
   grpc_chttp2_transport(const grpc_core::ChannelArgs& channel_args,
                         grpc_endpoint* ep, bool is_client);
   ~grpc_chttp2_transport() override;
 
   void Orphan() override;
 
+  grpc_core::RefCountedPtr<grpc_chttp2_transport> Ref() {
+    return grpc_core::FilterStackTransport::RefAsSubclass<
+        grpc_chttp2_transport>();
+  }
+
   size_t SizeOfStream() const override;
   bool HackyDisableStreamOpBatchCoalescingInConnectedChannel() const override;
   void PerformStreamOp(grpc_stream* gs,

src/core/ext/transport/inproc/inproc_transport.cc

@@ -33,8 +33,9 @@
 namespace grpc_core {
 
 namespace {
-class InprocServerTransport final : public RefCounted<InprocServerTransport>,
-                                    public ServerTransport {
+class InprocClientTransport;
+
+class InprocServerTransport final : public ServerTransport {
  public:
   void SetAcceptor(Acceptor* acceptor) override {
     acceptor_ = acceptor;
@@ -95,6 +96,8 @@ class InprocServerTransport final : public RefCounted<InprocServerTransport>,
     return acceptor_->CreateCall(std::move(md), acceptor_->CreateArena());
   }
 
+  OrphanablePtr<InprocClientTransport> MakeClientTransport();
+
  private:
   enum class ConnectionState : uint8_t { kInitial, kReady, kDisconnected };
 
@@ -109,6 +112,10 @@ class InprocServerTransport final : public RefCounted<InprocServerTransport>,
 
 class InprocClientTransport final : public ClientTransport {
  public:
+  explicit InprocClientTransport(
+      RefCountedPtr<InprocServerTransport> server_transport)
+      : server_transport_(std::move(server_transport)) {}
+
   void StartCall(CallHandler call_handler) override {
     call_handler.SpawnGuarded(
         "pull_initial_metadata",
@@ -125,10 +132,6 @@ class InprocClientTransport final : public ClientTransport {
 
   void Orphan() override { delete this; }
 
-  OrphanablePtr<Transport> GetServerTransport() {
-    return OrphanablePtr<Transport>(server_transport_->Ref().release());
-  }
-
   FilterStackTransport* filter_stack_transport() override { return nullptr; }
   ClientTransport* client_transport() override { return this; }
   ServerTransport* server_transport() override { return nullptr; }
@@ -144,8 +147,7 @@ class InprocClientTransport final : public ClientTransport {
         absl::UnavailableError("Client transport closed"));
   }
 
-  RefCountedPtr<InprocServerTransport> server_transport_ =
-      MakeRefCounted<InprocServerTransport>();
+  const RefCountedPtr<InprocServerTransport> server_transport_;
 };
 
 bool UsePromiseBasedTransport() {
@@ -155,6 +157,12 @@ bool UsePromiseBasedTransport() {
   return true;
 }
 
+OrphanablePtr<InprocClientTransport>
+InprocServerTransport::MakeClientTransport() {
+  return MakeOrphanable<InprocClientTransport>(
+      RefAsSubclass<InprocServerTransport>());
+}
+
 OrphanablePtr<Channel> MakeLameChannel(absl::string_view why,
                                        absl::Status error) {
   gpr_log(GPR_ERROR, "%s: %s", std::string(why).c_str(),
@@ -196,8 +204,8 @@ OrphanablePtr<Channel> MakeInprocChannel(Server* server,
 
 std::pair<OrphanablePtr<Transport>, OrphanablePtr<Transport>>
 MakeInProcessTransportPair() {
-  auto client_transport = MakeOrphanable<InprocClientTransport>();
-  auto server_transport = client_transport->GetServerTransport();
+  auto server_transport = MakeOrphanable<InprocServerTransport>();
+  auto client_transport = server_transport->MakeClientTransport();
   return std::make_pair(std::move(client_transport),
                         std::move(server_transport));
 }

src/core/lib/transport/transport.h

@@ -502,7 +502,7 @@ class FilterStackTransport;
 class ClientTransport;
 class ServerTransport;
 
-class Transport : public Orphanable {
+class Transport : public InternallyRefCounted<Transport> {
  public:
   struct RawPointerChannelArgTag {};
   static absl::string_view ChannelArgName() { return GRPC_ARG_TRANSPORT; }