Add support for gRPC to the protobuf.cpp module

This implements support for the gRPC framework: https://www.grpc.io

Change-Id: Ia85461b9618e73827114c137fce8615e5a8139e3
Reviewed-by: Qbs CI Bot <travis-bot@weickelt.de>
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

5 files changed, 254 insertions, 0 deletions

diff --git a/examples/examples.qbs b/examples/examples.qbs
index c6c1f4ac3..abb6d5d9a 100644
--- a/examples/examples.qbs
+++ b/examples/examples.qbs
@@ -58,6 +58,7 @@ Project {
         "code-generator/code-generator.qbs",
         "collidingmice/collidingmice.qbs",
         "compiled-qml/myapp.qbs",
+        "grpc/ping-pong-grpc.qbs",
         "helloworld-complex/hello.qbs",
         "helloworld-minimal/hello.qbs",
         "helloworld-qt/hello.qbs",
diff --git a/examples/grpc/client.cpp b/examples/grpc/client.cpp
new file mode 100644
index 000000000..55bcd866d
--- /dev/null
+++ b/examples/grpc/client.cpp
@@ -0,0 +1,95 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 Ivan Komissarov
+** Contact: abbapoh@gmail.com
+**
+** This file is part of Qbs.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms and
+** conditions see http://www.qt.io/terms-conditions. For further information
+** use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file.  Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, The Qt Company gives you certain additional
+** rights.  These rights are described in The Qt Company LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+****************************************************************************/
+
+#ifdef __GNUC__
+  #pragma GCC diagnostic push
+  #pragma GCC diagnostic ignored "-Wunused-parameter"
+#endif  // __GNUC__
+
+#include <ping-pong-grpc.grpc.pb.h>
+
+#include <grpc/grpc.h>
+#include <grpc++/channel.h>
+#include <grpc++/client_context.h>
+#include <grpc++/create_channel.h>
+
+#ifdef __GNUC__
+  #pragma GCC diagnostic pop
+#endif  // __GNUC__
+
+#include <iostream>
+#include <memory>
+#include <string>
+
+class Client
+{
+public:
+    Client(std::shared_ptr<grpc::Channel> channel)
+        : m_stub(PP::MyApi::NewStub(channel)) {}
+
+    int ping(int count) {
+        PP::Ping request;
+        request.set_count(count);
+        PP::Pong reply;
+        grpc::ClientContext context;
+
+        const auto status = m_stub->pingPong(&context, request, &reply);
+        if (status.ok()) {
+            return reply.count();
+        } else {
+            throw std::runtime_error("invalid status");
+        }
+    }
+
+private:
+    std::unique_ptr<PP::MyApi::Stub> m_stub;
+};
+
+int main(int, char**)
+{
+    Client client(
+            grpc::CreateCustomChannel(
+                    "localhost:50051",
+                    grpc::InsecureChannelCredentials(),
+                    grpc::ChannelArguments()));
+
+    for (int i = 0; i < 1000; ++i) {
+        std::cout << "Sending ping " << i << "... ";
+        int result = client.ping(i);
+        if (result != i) {
+            std::cerr << "Invalid pong " << result << " for ping" << i << std::endl;
+            continue;
+        }
+        std::cout << "got pong " << result << std::endl;
+    }
+
+    return 0;
+}
+
diff --git a/examples/grpc/ping-pong-grpc.proto b/examples/grpc/ping-pong-grpc.proto
new file mode 100644
index 000000000..da6d9490c
--- /dev/null
+++ b/examples/grpc/ping-pong-grpc.proto
@@ -0,0 +1,15 @@
+syntax = "proto3";
+
+package PP;
+
+message Ping {
+    int32 count = 1;
+}
+
+message Pong {
+    int32 count = 1;
+}
+
+service MyApi {
+    rpc pingPong(Ping) returns (Pong) {}
+}
diff --git a/examples/grpc/ping-pong-grpc.qbs b/examples/grpc/ping-pong-grpc.qbs
new file mode 100644
index 000000000..8d8909350
--- /dev/null
+++ b/examples/grpc/ping-pong-grpc.qbs
@@ -0,0 +1,65 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 Ivan Komissarov
+** Contact: abbapoh@gmail.com
+**
+** This file is part of Qbs.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms and
+** conditions see http://www.qt.io/terms-conditions. For further information
+** use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file.  Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, The Qt Company gives you certain additional
+** rights.  These rights are described in The Qt Company LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+****************************************************************************/
+
+import qbs.Utilities
+
+Project {
+    condition: Utilities.versionCompare(qbs.version, "1.14") >= 0
+
+    Application {
+        Depends { name: "cpp" }
+        Depends { name: "protobuf.cpp"; required: false }
+        condition: protobuf.cpp.present
+        protobuf.cpp.useGrpc: true
+        consoleApplication: true
+        cpp.cxxLanguageVersion: "c++17"
+        name: "client"
+        files: "client.cpp"
+        Group {
+            files: "ping-pong-grpc.proto"
+            fileTags: "protobuf.grpc"
+        }
+    }
+
+    Application {
+        Depends { name: "cpp" }
+        Depends { name: "protobuf.cpp"; required: false }
+        condition: protobuf.cpp.present
+        protobuf.cpp.useGrpc: true
+        consoleApplication: true
+        cpp.cxxLanguageVersion: "c++17"
+        name: "server"
+        files: "client.cpp"
+        Group {
+            files: "ping-pong-grpc.proto"
+            fileTags: "protobuf.grpc"
+        }
+    }
+}
diff --git a/examples/grpc/server.cpp b/examples/grpc/server.cpp
new file mode 100644
index 000000000..89d6f0096
--- /dev/null
+++ b/examples/grpc/server.cpp
@@ -0,0 +1,78 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 Ivan Komissarov
+** Contact: abbapoh@gmail.com
+**
+** This file is part of Qbs.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms and
+** conditions see http://www.qt.io/terms-conditions. For further information
+** use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file.  Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, The Qt Company gives you certain additional
+** rights.  These rights are described in The Qt Company LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+****************************************************************************/
+
+#ifdef __GNUC__
+  #pragma GCC diagnostic push
+  #pragma GCC diagnostic ignored "-Wunused-parameter"
+#endif  // __GNUC__
+
+#include <ping-pong-grpc.grpc.pb.h>
+
+#include <grpc/grpc.h>
+#include <grpc++/server.h>
+#include <grpc++/server_builder.h>
+#include <grpc++/server_context.h>
+#include <grpc++/security/server_credentials.h>
+
+#ifdef __GNUC__
+  #pragma GCC diagnostic pop
+#endif  // __GNUC__
+
+#include <iostream>
+#include <memory>
+#include <string>
+
+class Service final : public PP::MyApi::Service
+{
+    grpc::Status pingPong(
+            grpc::ServerContext* context,
+            const PP::Ping* request,
+            PP::Pong* reply) override
+    {
+        (void)context;
+        reply->set_count(request->count());
+        return grpc::Status::OK;
+    }
+};
+
+int main(int, char**)
+{
+    std::string server_address("0.0.0.0:50051");
+    Service service;
+
+    grpc::ServerBuilder builder;
+    builder.AddListeningPort(server_address, grpc::InsecureServerCredentials());
+    builder.RegisterService(&service);
+    std::unique_ptr<grpc::Server> server(builder.BuildAndStart());
+    std::cout << "Server listening on " << server_address << std::endl;
+    server->Wait();
+    return 0;
+}
+