Make OnCreatingStream return stream_user_data making code more readable

src/brpc/controller.cpp

@@ -733,8 +733,10 @@ void Controller::Call::OnComplete(
     case CONNECTION_TYPE_SHORT:
         if (sending_sock != NULL) {
             // Check the comment in CONNECTION_TYPE_POOLED branch.
-            if (!sending_sock->is_read_progressive() && c->_stream_creator == NULL) {
+            if (!sending_sock->is_read_progressive()) {
+                if (c->_stream_creator == NULL) {
                     sending_sock->SetFailed();
+                }
             } else {
                 sending_sock->OnProgressiveReadCompleted();
             }
@@ -998,6 +1000,7 @@ void Controller::IssueRPC(int64_t start_realtime_us) {
         _remote_side = tmp_sock->remote_side();
     }
     if (_stream_creator) {
+        _current_call.stream_user_data =
                 _stream_creator->OnCreatingStream(&tmp_sock, this);
         if (FailedInline()) {
             return HandleSendFailed();

src/brpc/controller.h

@@ -581,7 +581,7 @@ private:
         // CONNECTION_TYPE_SINGLE. Otherwise, it may be a temporary
         // socket fetched from socket pool
         SocketUniquePtr sending_sock;
-        StreamUserData* stream_user_data;
+        void* stream_user_data;
     };
 
     void HandleStreamConnection(Socket *host_socket);

src/brpc/details/controller_private_accessor.h

@@ -67,9 +67,8 @@ public:
         _cntl->_current_call.sending_sock.reset(ptr.release());
     }
 
-    ControllerPrivateAccessor &set_stream_user_data(StreamUserData* ptr){
-        _cntl->_current_call.stream_user_data = ptr;
-        return *this;
+    void* get_stream_user_data() {
+        return _cntl->_current_call.stream_user_data;
     }
 
     ControllerPrivateAccessor &set_security_mode(bool security_mode) {

src/brpc/policy/http2_rpc_protocol.cpp

@@ -1232,7 +1232,7 @@ static void PackH2Message(butil::IOBuf* out,
     }
 }
 
-H2UnsentRequest* H2UnsentRequest::New(Controller* c, uint64_t correlation_id) {
+H2UnsentRequest* H2UnsentRequest::New(Controller* c) {
     const HttpHeader& h = c->http_request();
     const CommonStrings* const common = get_common_strings();
     const bool need_content_length = (h.method() != HTTP_METHOD_GET);
@@ -1311,7 +1311,6 @@ H2UnsentRequest* H2UnsentRequest::New(Controller* c, uint64_t correlation_id) {
         val->append(encoded_user_info);
     }
     msg->_sctx.reset(new H2StreamContext);
-    msg->_sctx->set_correlation_id(correlation_id);
     return msg;
 }
 
@@ -1331,7 +1330,7 @@ private:
     H2UnsentRequest* _msg;
 };
 
-void H2UnsentRequest::OnDestroy(SocketUniquePtr& sending_sock, Controller* cntl) {
+void H2UnsentRequest::Discard(SocketUniquePtr& sending_sock, Controller* cntl) {
     RemoveRefOnQuit deref_self(this);
     if (sending_sock != NULL && cntl->ErrorCode() != 0) {
         CHECK_EQ(cntl, _cntl);
@@ -1342,6 +1341,7 @@ void H2UnsentRequest::OnDestroy(SocketUniquePtr& sending_sock, Controller* cntl)
             ctx->AddAbandonedStream(_stream_id);
         }
     }
+    RemoveRefManually();
 }
 
 // bvar::Adder<int64_t> g_append_request_time;
@@ -1635,13 +1635,9 @@ void PackH2Request(butil::IOBuf*,
         header->SetHeader("Authorization", auth_data);
     }
 
-    // Serialize http2 request
-    H2UnsentRequest* h2_req = H2UnsentRequest::New(cntl, correlation_id);
-    if (!h2_req) {
-        return cntl->SetFailed(ENOMEM, "Fail to create H2UnsentRequest");
-    }
-    h2_req->AddRefManually();   // add ref for H2UnsentRequest::OnDestroy
-    accessor.set_stream_user_data(h2_req);
+    H2UnsentRequest* h2_req = (H2UnsentRequest*)accessor.get_stream_user_data();
+    h2_req->AddRefManually();   // add ref for AppendAndDestroySelf
+    h2_req->_sctx->set_correlation_id(correlation_id);
     *user_message = h2_req;
     
     if (FLAGS_http_verbose) {
@@ -1651,11 +1647,12 @@ void PackH2Request(butil::IOBuf*,
     }
 }
 
-void H2GlobalStreamCreator::OnCreatingStream(
+void* H2GlobalStreamCreator::OnCreatingStream(
     SocketUniquePtr* inout, Controller* cntl) {
     // Although the critical section looks huge, it should rarely be contended
     // since timeout of RPC is much larger than the delay of sending.
     std::unique_lock<butil::Mutex> mu(_mutex);
+    bool need_create_agent = true;
     do {
         if (!(*inout)->_agent_socket ||
             (*inout)->_agent_socket->Failed()) {
@@ -1669,21 +1666,22 @@ void H2GlobalStreamCreator::OnCreatingStream(
             break;
         }
         (*inout)->_agent_socket->ReAddress(inout);
-        return;
+        need_create_agent = false;
     } while (0);
 
+    if (need_create_agent) {
         SocketId sid;
         SocketOptions opt = (*inout)->_options;
         opt.health_check_interval_s = -1;
         // TODO(zhujiashun): Predictively create socket to improve performance
         if (get_client_side_messenger()->Create(opt, &sid) != 0) {
             cntl->SetFailed(EINVAL, "Fail to create H2 socket");
-        return;
+            return NULL;
         }
         SocketUniquePtr tmp_ptr;
         if (Socket::Address(sid, &tmp_ptr) != 0) {
             cntl->SetFailed(EFAILEDSOCKET, "Fail to address H2 socketId=%" PRIu64, sid);
-        return;
+            return NULL;
         }
         tmp_ptr->ShareStats(inout->get());
         (*inout)->_agent_socket.swap(tmp_ptr);
@@ -1692,16 +1690,25 @@ void H2GlobalStreamCreator::OnCreatingStream(
         if (tmp_ptr) {
             tmp_ptr->ReleaseAdditionalReference();
         }
+    }
+
+    H2UnsentRequest* h2_req = H2UnsentRequest::New(cntl);
+    if (!h2_req) {
+        cntl->SetFailed(ENOMEM, "Fail to create H2UnsentRequest");
+        return NULL;
+    }
+    return (void*)h2_req;
 }
 
 void H2GlobalStreamCreator::OnDestroyingStream(SocketUniquePtr& sending_sock,
                                                Controller* cntl,
                                                int error_code,
                                                bool end_of_rpc,
-                                               StreamUserData* stream_user_data) {
+                                               void* stream_user_data) {
     // [stream_user_data == NULL] means that RPC has failed before it is created.
-    if (stream_user_data) {
-        stream_user_data->OnDestroy(sending_sock, cntl);
+    H2UnsentRequest* h2_req = static_cast<H2UnsentRequest*>(stream_user_data);
+    if (h2_req) {
+        h2_req->Discard(sending_sock, cntl);
     }
 }
 

src/brpc/policy/http2_rpc_protocol.h

@@ -88,9 +88,12 @@ inline Http2Bvars* get_http2_bvars() {
     return butil::get_leaky_singleton<Http2Bvars>();
 }
 
-class H2UnsentRequest : public SocketMessage, public StreamUserData {
+class H2UnsentRequest : public SocketMessage {
+friend void PackH2Request(butil::IOBuf*, SocketMessage**,
+                          uint64_t, const google::protobuf::MethodDescriptor*,
+                          Controller*, const butil::IOBuf&, const Authenticator*);
 public:
-    static H2UnsentRequest* New(Controller* c, uint64_t correlation_id);
+    static H2UnsentRequest* New(Controller* c);
     void Describe(butil::IOBuf*) const;
 
     int AddRefManually()
@@ -107,8 +110,7 @@ public:
     butil::Status AppendAndDestroySelf(butil::IOBuf* out, Socket*);
     size_t EstimatedByteSize();
 
-    // @StreamUserData
-    void OnDestroy(SocketUniquePtr& sending_sock, Controller* cntl);
+    void Discard(SocketUniquePtr& sending_sock, Controller* cntl);
 
 private:
     std::string& push(const std::string& name)
@@ -233,12 +235,12 @@ void PackH2Request(butil::IOBuf* buf,
 
 class H2GlobalStreamCreator : public StreamCreator {
 protected:
-    void OnCreatingStream(SocketUniquePtr* inout, Controller* cntl) override;
+    void* OnCreatingStream(SocketUniquePtr* inout, Controller* cntl) override;
     void OnDestroyingStream(SocketUniquePtr& sending_sock,
                             Controller* cntl,
                             int error_code,
                             bool end_of_rpc,
-                            StreamUserData* stream_user_data) override;
+                            void* stream_user_data) override;
 private:
     butil::Mutex _mutex;
 };

src/brpc/rtmp.cpp

@@ -1678,26 +1678,26 @@ void RtmpClientStream::SignalError() {
     }
 }
 
-void RtmpClientStream::OnCreatingStream(
+void* RtmpClientStream::OnCreatingStream(
     SocketUniquePtr* inout, Controller* cntl) {
     {
         std::unique_lock<butil::Mutex> mu(_state_mutex);
         if (_state == STATE_ERROR || _state == STATE_DESTROYING) {
             cntl->SetFailed(EINVAL, "Fail to replace socket for stream, _state is error or destroying");
-            return;
+            return NULL;
         }
     }
     SocketId esid;
     if (cntl->connection_type() == CONNECTION_TYPE_SHORT) {
         if (_client_impl->CreateSocket((*inout)->remote_side(), &esid) != 0) {
             cntl->SetFailed(EINVAL, "Fail to create RTMP socket");
-            return;
+            return NULL;
         }
     } else {
         if (_client_impl->socket_map().Insert(
                 SocketMapKey((*inout)->remote_side()), &esid) != 0) {
             cntl->SetFailed(EINVAL, "Fail to get the RTMP socket");
-            return;
+            return NULL;
         }
     }
     SocketUniquePtr tmp_ptr;
@@ -1705,12 +1705,13 @@ void RtmpClientStream::OnCreatingStream(
         cntl->SetFailed(EFAILEDSOCKET, "Fail to address RTMP SocketId=%" PRIu64
                         " from SocketMap of RtmpClient=%p",
                         esid, _client_impl.get());
-        return;
+        return NULL;
     }
     RPC_VLOG << "Replace Socket For Stream, RTMP socketId=" << esid
              << ", main socketId=" << (*inout)->id();
     tmp_ptr->ShareStats(inout->get());
     inout->reset(tmp_ptr.release());
+    return NULL;
 }
 
 int RtmpClientStream::RunOnFailed(bthread_id_t id, void* data, int) {
@@ -1749,7 +1750,7 @@ void RtmpClientStream::OnDestroyingStream(SocketUniquePtr& sending_sock,
                                           Controller* cntl,
                                           int /*error_code*/,
                                           bool end_of_rpc,
-                                          StreamUserData* /*stream_data*/) {
+                                          void* /*stream_data*/) {
     if (!end_of_rpc) {
         if (sending_sock) {
             if (_from_socketmap) {

src/brpc/rtmp.h

@@ -821,9 +821,9 @@ friend class RtmpRetryingClientStream;
     int Publish(const butil::StringPiece& name, RtmpPublishType type);
 
     // @StreamCreator
-    void OnCreatingStream(SocketUniquePtr* inout, Controller* cntl) override;
+    void* OnCreatingStream(SocketUniquePtr* inout, Controller* cntl) override;
     void OnDestroyingStream(SocketUniquePtr&, Controller*, int error_code,
-                            bool end_of_rpc, StreamUserData*) override;
+                            bool end_of_rpc, void*) override;
 
     void OnFailedToCreateStream();
     

src/brpc/stream_creator.h

@@ -22,14 +22,6 @@
 namespace brpc {
 class Controller;
 
-// The stream user data on a specific Call
-class StreamUserData {
-public:
-    virtual ~StreamUserData() {}
-
-    virtual void OnDestroy(SocketUniquePtr& sending_sock, Controller* cntl) = 0;
-};
-
 // Abstract creation of "user-level connection" over a RPC-like process.
 // Lifetime of this object should be guaranteed by user during the RPC,
 // generally this object is created before RPC and destroyed after RPC.
@@ -48,7 +40,7 @@ public:
     //    when stream_creator is present.
     //  cntl: contains contexts of the RPC, if there's any error during
     //    replacement, call cntl->SetFailed().
-    virtual void OnCreatingStream(SocketUniquePtr* inout,
+    virtual void* OnCreatingStream(SocketUniquePtr* inout,
                                    Controller* cntl) = 0;
 
     // Called when the stream is about to destroyed.
@@ -64,7 +56,7 @@ public:
                                     Controller* cntl,
                                     int error_code,
                                     bool end_of_rpc,
-                                    StreamUserData* stream_user_data) = 0;
+                                    void* stream_user_data) = 0;
 };
 
 } // namespace brpc