Merge pull request #12 from yang-g/c++api

ServerAsyncResponseWriter and codegen change

include/grpc++/stream.h

@@ -582,17 +582,52 @@ class ClientAsyncReaderWriter final : public ClientAsyncStreamingInterface,
 template <class W>
 class ServerAsyncResponseWriter final {
  public:
-  explicit ServerAsyncResponseWriter(Call* call) : call_(call) {}
+  ServerAsyncResponseWriter(Call* call, ServerContext* ctx)
+      : call_(call), ctx_(ctx) {}
 
-  virtual void Write(const W& msg, void* tag) override {
-    CallOpBuffer buf;
-    buf.Reset(tag);
-    buf.AddSendMessage(msg);
-    call_->PerformOps(&buf);
+  void SendInitialMetadata(void* tag) {
+    GPR_ASSERT(!ctx_->sent_initial_metadata_);
+
+    meta_buf_.Reset(tag);
+    meta_buf_.AddSendInitialMetadata(&ctx_->initial_metadata_);
+    ctx_->sent_initial_metadata_ = true;
+    call_->PerformOps(&meta_buf_);
+  }
+
+  void Finish(const W& msg, const Status& status, void* tag) {
+    finish_buf_.Reset(tag);
+    if (!ctx_->sent_initial_metadata_) {
+      finish_buf_.AddSendInitialMetadata(&ctx_->initial_metadata_);
+      ctx_->sent_initial_metadata_ = true;
+    }
+    // The response is dropped if the status is not OK.
+    if (status.IsOk()) {
+      finish_buf_.AddSendMessage(msg);
+    }
+    bool cancelled = false;
+    finish_buf_.AddServerRecvClose(&cancelled);
+    finish_buf_.AddServerSendStatus(&ctx_->trailing_metadata_, status);
+    call_->PerformOps(&finish_buf_);
+  }
+
+  void FinishWithError(const Status& status, void* tag) {
+    GPR_ASSERT(!status.IsOk());
+    finish_buf_.Reset(tag);
+    if (!ctx_->sent_initial_metadata_) {
+      finish_buf_.AddSendInitialMetadata(&ctx_->initial_metadata_);
+      ctx_->sent_initial_metadata_ = true;
+    }
+    bool cancelled = false;
+    finish_buf_.AddServerRecvClose(&cancelled);
+    finish_buf_.AddServerSendStatus(&ctx_->trailing_metadata_, status);
+    call_->PerformOps(&finish_buf_);
   }
 
  private:
   Call* call_;
+  ServerContext* ctx_;
+  CallOpBuffer meta_buf_;
+  CallOpBuffer finish_buf_;
 };
 
 template <class R>

src/compiler/cpp_generator.cc

@@ -190,7 +190,7 @@ void PrintHeaderClientMethod(google::protobuf::io::Printer *printer,
                    "::grpc::ClientWriter< $Request$>* $Method$("
                    "::grpc::ClientContext* context, $Response$* response);\n");
     printer->Print(*vars,
-                   "::grpc::ClientWriter< $Request$>* $Method$("
+                   "::grpc::ClientAsyncWriter< $Request$>* $Method$("
                    "::grpc::ClientContext* context, $Response$* response, "
                    "::grpc::Status *status, "
                    "::grpc::CompletionQueue *cq, void *tag);\n");
@@ -200,7 +200,7 @@ void PrintHeaderClientMethod(google::protobuf::io::Printer *printer,
         "::grpc::ClientReader< $Response$>* $Method$("
         "::grpc::ClientContext* context, const $Request$* request);\n");
     printer->Print(*vars,
-                   "::grpc::ClientReader< $Response$>* $Method$("
+                   "::grpc::ClientAsyncReader< $Response$>* $Method$("
                    "::grpc::ClientContext* context, const $Request$* request, "
                    "::grpc::CompletionQueue *cq, void *tag);\n");
   } else if (BidiStreaming(method)) {