chore: import upstream snapshot with attribution

example/nshead_pb_extension_c++/server.cpp

@@ -0,0 +1,126 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+// A server to receive EchoRequest and send back EchoResponse.
+
+#include <google/protobuf/descriptor.h>
+#include <gflags/gflags.h>
+#include <butil/logging.h>
+#include <brpc/server.h>
+#include <brpc/nshead_pb_service_adaptor.h>
+#include "echo.pb.h"
+
+DEFINE_int32(port, 8010, "TCP Port of this server");
+DEFINE_int32(idle_timeout_s, -1, "Connection will be closed if there is no "
+             "read/write operations during the last `idle_timeout_s'");
+
+// Your implementation of example::EchoService
+namespace example {
+class EchoServiceImpl : public EchoService {
+public:
+    EchoServiceImpl() {}
+    virtual ~EchoServiceImpl() {}
+    virtual void Echo(google::protobuf::RpcController*,
+                      const EchoRequest* request,
+                      EchoResponse* response,
+                      google::protobuf::Closure* done) {
+        // This object helps you to call done->Run() in RAII style. If you need
+        // to process the request asynchronously, pass done_guard.release().
+        brpc::ClosureGuard done_guard(done);
+
+        // Echo response.
+        response->set_message(request->message());
+    }
+};
+}  // namespace example
+
+// Adapt your own nshead-based protocol to use pbrpc interface
+class MyNsheadProtocol : public brpc::NsheadPbServiceAdaptor {
+public:
+    void ParseNsheadMeta(
+        const brpc::Server&, const brpc::NsheadMessage&,
+        brpc::Controller*,
+        brpc::NsheadMeta* out_meta) const {
+        // Always use EchoService::Echo
+        const google::protobuf::ServiceDescriptor* svc =
+                example::EchoService::descriptor();
+        out_meta->set_full_method_name(svc->method(0)->full_name());
+    }
+
+    void ParseRequestFromIOBuf(const brpc::NsheadMeta&,
+                               const brpc::NsheadMessage& raw_req,
+                               brpc::Controller* cntl,
+                               google::protobuf::Message* pb_req) const {
+        // `req' MUST be EchoRequest here since we have only one RPCMethod
+        example::EchoRequest* echo_req =
+                dynamic_cast<example::EchoRequest*>(pb_req);
+        if (!echo_req) {
+            cntl->SetFailed(brpc::EREQUEST, "Fail to parse request");
+            return;
+        }
+        echo_req->set_message(raw_req.body.to_string());
+    }
+
+    void SerializeResponseToIOBuf(
+        const brpc::NsheadMeta&, brpc::Controller* cntl,
+        const google::protobuf::Message* pb_res,
+        brpc::NsheadMessage* raw_res) const {
+        if (cntl->Failed()) {
+            // Can't send failure feedback in this protocol
+            cntl->CloseConnection("Close connection due to previous error");
+            return;
+        }
+        // `res' MUST be EchoResponse here since we have only one RPCMethod
+        const example::EchoResponse* echo_res =
+                dynamic_cast<const example::EchoResponse*>(pb_res);
+        if (!echo_res) {
+            cntl->CloseConnection("Close connection due to bad response");
+            return;
+        }
+        raw_res->body.append(echo_res->message());
+    }
+};
+
+int main(int argc, char* argv[]) {
+    // Parse gflags. We recommend you to use gflags as well.
+    GFLAGS_NAMESPACE::ParseCommandLineFlags(&argc, &argv, true);
+
+    brpc::Server server;
+    example::EchoServiceImpl echo_service_impl;
+
+    // Add the service into server. Notice the second parameter, because the
+    // service is put on stack, we don't want server to delete it, otherwise
+    // use brpc::SERVER_OWNS_SERVICE.
+    if (server.AddService(&echo_service_impl, 
+                          brpc::SERVER_DOESNT_OWN_SERVICE) != 0) {
+        LOG(ERROR) << "Fail to add service";
+        return -1;
+    }
+
+    // Start the server.
+    brpc::ServerOptions options;
+    options.nshead_service = new MyNsheadProtocol;  // the adaptor
+    options.idle_timeout_sec = FLAGS_idle_timeout_s;
+    if (server.Start(FLAGS_port, &options) != 0) {
+        LOG(ERROR) << "Fail to start EchoServer";
+        return -1;
+    }
+
+    // Wait until Ctrl-C is pressed, then Stop() and Join() the server.
+    server.RunUntilAskedToQuit();
+    return 0;
+}