Initial import.

1 files changed, 108 insertions, 0 deletions

diff --git a/src/cpp/server/server_rpc_handler.cc b/src/cpp/server/server_rpc_handler.cc
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+++ b/src/cpp/server/server_rpc_handler.cc
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+/*
+ *
+ * Copyright 2014, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include "src/cpp/server/server_rpc_handler.h"
+
+#include <grpc/support/log.h>
+#include "src/cpp/server/rpc_service_method.h"
+#include <grpc++/async_server_context.h>
+
+namespace grpc {
+
+ServerRpcHandler::ServerRpcHandler(AsyncServerContext* server_context,
+                                   RpcServiceMethod* method)
+    : server_context_(server_context),
+      method_(method) {
+}
+
+void ServerRpcHandler::StartRpc() {
+  // Start the rpc on this dedicated completion queue.
+  server_context_->Accept(cq_.cq());
+
+  if (method_ == nullptr) {
+    // Method not supported, finish the rpc with error.
+    // TODO(rocking): do we need to call read to consume the request?
+    FinishRpc(Status(StatusCode::UNIMPLEMENTED, "No such method."));
+    return;
+  }
+
+  // Allocate request and response.
+  std::unique_ptr<google::protobuf::Message> request(method_->AllocateRequestProto());
+  std::unique_ptr<google::protobuf::Message> response(method_->AllocateResponseProto());
+
+  // Read request
+  server_context_->StartRead(request.get());
+  auto type = WaitForNextEvent();
+  GPR_ASSERT(type == CompletionQueue::SERVER_READ_OK);
+
+  // Run the application's rpc handler
+  MethodHandler* handler = method_->handler();
+  Status status = handler->RunHandler(
+      MethodHandler::HandlerParameter(request.get(), response.get()));
+
+  if (status.IsOk()) {
+    // Send the response if we get an ok status.
+    server_context_->StartWrite(*response, 0);
+    type = WaitForNextEvent();
+    if (type != CompletionQueue::SERVER_WRITE_OK) {
+      status = Status(StatusCode::INTERNAL, "Error writing response.");
+    }
+  }
+
+  FinishRpc(status);
+}
+
+CompletionQueue::CompletionType ServerRpcHandler::WaitForNextEvent() {
+  void* tag = nullptr;
+  CompletionQueue::CompletionType type = cq_.Next(&tag);
+  if (type != CompletionQueue::QUEUE_CLOSED &&
+      type != CompletionQueue::RPC_END) {
+    GPR_ASSERT(static_cast<AsyncServerContext*>(tag) == server_context_.get());
+  }
+  return type;
+}
+
+void ServerRpcHandler::FinishRpc(const Status& status) {
+  server_context_->StartWriteStatus(status);
+  CompletionQueue::CompletionType type = WaitForNextEvent();
+  // TODO(rocking): do we care about this return type?
+
+  type = WaitForNextEvent();
+  GPR_ASSERT(type == CompletionQueue::RPC_END);
+
+  cq_.Shutdown();
+  type = WaitForNextEvent();
+  GPR_ASSERT(type == CompletionQueue::QUEUE_CLOSED);
+}
+
+}  // namespace grpc