Add grpc server outline

Only handles unary grpcs. Only success implemented this far.

CMakeLists.txt

@@ -242,6 +242,10 @@ set(HAVE_JEMALLOC   ${JEMALLOC_FOUND})
 
 if(ENABLE_ASIO_LIB)
   find_package(Boost 1.54.0 REQUIRED system thread)
+
+  if(ENABLE_GRPC)
+      find_package(Protobuf REQUIRED)
+  endif()
 endif()
 
 # libbpf (for bpf)
@@ -565,6 +569,7 @@ message(STATUS "summary of build options:
       Applications:   ${ENABLE_APP}
       HPACK tools:    ${ENABLE_HPACK_TOOLS}
       Libnghttp2_asio:${ENABLE_ASIO_LIB}
+      gRPC:           ${ENABLE_GRPC}
       Examples:       ${ENABLE_EXAMPLES}
       Python bindings:${ENABLE_PYTHON_BINDINGS}
       Threading:      ${ENABLE_THREADS}

examples/CMakeLists.txt

@@ -36,15 +36,11 @@ if(ENABLE_EXAMPLES)
   )
 
   if(ENABLE_ASIO_LIB)
-    foreach(name asio-sv asio-sv2 asio-cl asio-cl2)
-      add_executable(${name} ${name}.cc $<TARGET_OBJECTS:llhttp>
-        $<TARGET_OBJECTS:url-parser>
-      )
-      target_include_directories(${name} PRIVATE
+      set(cc_includes
           ${OPENSSL_INCLUDE_DIRS}
           ${Boost_INCLUDE_DIRS}
       )
-      target_link_libraries(${name}
+      set(cc_libraries
           nghttp2
           nghttp2_asio
           ${JEMALLOC_LIBRARIES}
@@ -52,6 +48,35 @@ if(ENABLE_EXAMPLES)
           ${Boost_LIBRARIES}
           ${APP_LIBRARIES}
       )
+    foreach(name asio-sv asio-sv2 asio-cl asio-cl2)
+      add_executable(${name} ${name}.cc $<TARGET_OBJECTS:llhttp>
+        $<TARGET_OBJECTS:url-parser>
+      )
+      target_include_directories(${name} PRIVATE ${cc_includes} )
+      target_link_libraries(${name} ${cc_libraries} )
     endforeach()
   endif()
+
+  if(ENABLE_ASIO_LIB AND ENABLE_GRPC)
+      MESSAGE("GENERATING protobuggg!")
+    protobuf_generate_cpp(PROTO_SRCS PROTO_HDRS helloworld.proto)
+    foreach(name grpc-sv)
+      add_executable(${name} ${name}.cc
+          $<TARGET_OBJECTS:llhttp>
+          $<TARGET_OBJECTS:url-parser>
+          ${PROTO_SRCS}
+          ${PROTO_HDRS}
+      )
+      target_include_directories(${name} PRIVATE
+          ${cc_includes}
+          ${Protobuf_INCLUDE_DIRS}
+          ${CMAKE_CURRENT_BINARY_DIR}
+          )
+      target_link_libraries(${name} ${cc_libraries} ${Protobuf_LIBRARIES})
+    endforeach()
+  else()
+      MESSAGE("NOtdsdsda")
+  endif()
+
+
 endif()

examples/grpc-sv.cc

@@ -0,0 +1,52 @@
+/*
+ * nghttp2 - HTTP/2 C Library
+ *
+ * Copyright (c) 2022 Nils Carlson
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <nghttp2/asio_grpc_server.h>
+
+#include "helloworld.pb.h"
+
+using namespace nghttp2::asio_http2::server;
+using namespace nghttp2::asio_grpc::server;
+
+using SayHello_request = grpc_unary_request<helloworld::HelloRequest, helloworld::HelloReply >;
+using SayHello_response = grpc_unary_response<helloworld::HelloReply>;
+using SayHello_handler = grpc_unary_handler<helloworld::HelloRequest, helloworld::HelloReply >;
+
+int main(int , char *[]) {
+  boost::system::error_code ec;
+  http2 server;
+
+  server.handle("/helloworld.Greeter/SayHello", SayHello_handler{[](const SayHello_request &&request, SayHello_response &&response )
+                                        {
+
+                                            auto hello = request.get_message();
+                                            std::cerr << "Got message with name :" << hello.name() << "\n";
+                                            response.getMessage().set_message( "Hello " + hello.name() );
+                                            response.write_response();
+                                        }});
+  if (server.listen_and_serve(ec, "localhost", "3000")) {
+    std::cerr << "error: " << ec.message() << std::endl;
+  }
+}

examples/helloworld.proto

@@ -0,0 +1,38 @@
+// Copyright 2015 gRPC authors.
+//
+// Licensed 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.
+
+syntax = "proto3";
+
+option java_multiple_files = true;
+option java_package = "io.grpc.examples.helloworld";
+option java_outer_classname = "HelloWorldProto";
+option objc_class_prefix = "HLW";
+
+package helloworld;
+
+// The greeting service definition.
+service Greeter {
+  // Sends a greeting
+  rpc SayHello (HelloRequest) returns (HelloReply) {}
+}
+
+// The request message containing the user's name.
+message HelloRequest {
+  string name = 1;
+}
+
+// The response message containing the greetings
+message HelloReply {
+  string message = 1;
+}

src/includes/nghttp2/asio_grpc_server.h

@@ -0,0 +1,227 @@
+/*
+ * nghttp2 - HTTP/2 C Library
+ *
+ * Copyright (c) 2022 Nils Carlson
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#ifndef NGHTTP2_ASIO_GRPC_SERVER_H
+#define NGHTTP2_ASIO_GRPC_SERVER_H
+
+#include <nghttp2/asio_http2_server.h>
+#include <iostream>
+
+namespace nghttp2 {
+
+namespace asio_grpc {
+
+namespace server {
+
+extern "C" {
+struct __attribute__((packed)) grpc_header {
+    uint8_t flags;
+    uint32_t length;
+};
+}
+
+template< typename T, typename U> class grpc_unary_request;
+template< typename U> class grpc_unary_response;
+
+template<typename T, typename U> using on_unary_grpc = std::function< void(const grpc_unary_request< T, U > &&, grpc_unary_response< U > &&) >;
+
+class grpc_unary_request_impl
+{
+
+
+};
+
+template< typename T, typename U> class grpc_unary_request
+{
+public:
+    grpc_unary_request( const on_unary_grpc< T, U> &on_unary_grpc,
+                        const ::nghttp2::asio_http2::server::request &request ) :
+        on_unary_grpc_{ on_unary_grpc },
+        request_{ request }
+    {
+    }
+
+    void receive_message( grpc_unary_request< T, U > &&grpc_unary_request,
+                          grpc_unary_response< U > &&grpc_unary_response )
+    {
+        grpc_header header = { 0, 0 };
+        std::string buffer;
+        bool have_header = false;
+
+        grpc_unary_request.request_.on_data([header, buffer, have_header,
+                                            grpc_unary_request = std::move(grpc_unary_request),
+                                            grpc_unary_response = std::move(grpc_unary_response)] (const uint8_t *data, std::size_t len) mutable
+        {
+            if (len == 0)
+            {
+                return;
+            }
+
+            std::copy_n(data, len, std::back_inserter(buffer));
+
+            if (!have_header && buffer.size() >= sizeof (header))
+            {
+                memcpy(&header, buffer.data(), sizeof (header));
+                header.length = ntohl(header.length);
+                have_header = true;
+            }
+
+            if (have_header && buffer.size() >= (header.length + sizeof (header) ))
+            {
+                auto parsed = grpc_unary_request.get_message().ParseFromArray( buffer.data() + sizeof (header), header.length );
+                if (!parsed)
+                {
+                    // error!
+                }
+                buffer.erase(0, sizeof(header));
+                have_header = false;
+
+                if (parsed)
+                {
+                    grpc_unary_request.on_unary_grpc_( std::move( grpc_unary_request ), std::move( grpc_unary_response ) );
+                }
+
+            }
+        });
+    }
+
+    T &get_message()
+    {
+        return message_;
+    }
+
+    const T &get_message() const
+    {
+        return message_;
+    }
+
+private:
+    T message_;
+    on_unary_grpc< T, U> on_unary_grpc_;
+    const ::nghttp2::asio_http2::server::request &request_;
+};
+
+
+template< typename U> class grpc_unary_response
+{
+public:
+    grpc_unary_response( const ::nghttp2::asio_http2::server::response &response ) :
+        response_{ response }
+    {}
+
+    void write_response( )
+    {
+        ::nghttp2::asio_http2::header_map grpc_response_header;
+        ::nghttp2::asio_http2::header_value grpc_status_value = { "0", 0 };
+        grpc_response_header.insert({ "content-type", {"application/grpc", 0} });
+        response_.write_head(200, grpc_response_header);
+
+        auto encoded = message_.SerializeAsString();
+        if (encoded.empty())
+        {
+            std::cerr << "Encoding gailed\n";
+            // error!
+        }
+
+        std::vector<char> buf;
+        buf.resize(sizeof (grpc_header) + encoded.size() );
+        std::cerr << "buf size: " << buf.size() << "\n";
+
+        grpc_header *header = reinterpret_cast<grpc_header *>(buf.data());
+
+        header->flags = 0;
+        header->length = htonl( encoded.size() );
+
+        std::copy_n(encoded.data(), encoded.size(), buf.data() + sizeof(grpc_header ));
+
+        std::cerr << "message size: " << ntohl(reinterpret_cast<const grpc_header *>(buf.data())->length) << "\n";
+
+        std::size_t count = 0;
+        response_.end([=](uint8_t *data, std::size_t len, uint32_t *data_flags) mutable {
+
+
+            *data_flags |= NGHTTP2_DATA_FLAG_EOF | NGHTTP2_DATA_FLAG_NO_END_STREAM;
+
+            std::cerr << "len " << len << " bytes\n";
+            std::cerr << "count " << count << " bytes\n";
+
+            std::size_t to_copy = std::min(buf.size() - count, len );
+            std::copy_n( buf.data() + count, to_copy, data );
+            std::cerr << "Copied " << to_copy << " bytes\n";
+
+            count += to_copy;
+
+            if (count == buf.size())
+            {
+                ::nghttp2::asio_http2::header_map grpc_response_trailer;
+                grpc_response_trailer.insert({ "grpc-status", {"0", 0} });
+                response_.write_trailer(grpc_response_trailer);
+
+                std::cerr << "Wrote all data!\n";
+            }
+            return to_copy;
+        });
+
+    }
+
+    U &getMessage()
+    {
+        return message_;
+    }
+
+private:
+    U message_;
+    const ::nghttp2::asio_http2::server::response &response_;
+};
+
+
+template<typename T, typename U>
+class grpc_unary_handler
+{
+public:
+
+    grpc_unary_handler(on_unary_grpc<T,U> &&on_request ) :
+        on_request_{on_request}
+    {
+    }
+
+    void operator()( const ::nghttp2::asio_http2::server::request &req, const ::nghttp2::asio_http2::server::response &res ) const
+    {
+        grpc_unary_request<T,U> request{ on_request_, req };
+        grpc_unary_response<U> response{ res };
+
+        request.receive_message(std::move(request), std::move(response));
+    }
+
+private:
+    on_unary_grpc< T, U > on_request_;
+};
+
+} // namespace client
+
+} // namespace asio_grpc
+
+} // namespace nghttp2
+
+#endif // NGHTTP2_ASIO_HTTP2_CLIENT_H