使用Chromium内置的net service 建立一个简单的HTTP Server

      在Chromium 源代码中，提供了建立HTTP Server的代码库。

      在原有的net库中，本来提供了net::HttpServer类来实现一个HttpServer. 但是这个类目前已经被放弃。相关功能移动到了

services/network/cpp/public/server中。

1.       工程的BUILD.gn中，需要加入依赖。因为network下的server需要mojo进行通信，所以要包含mojo依赖库。

    deps = [
         "//base",
         "//net",
         "//services/network/:network_service",
         "//mojo/core/embedder",
         "//mojo/public/cpp/bindings",
         "//mojo/public/cpp/system",
         "//net:extras",
         "//services/network/public/cpp",
         "//services/network/public/cpp:buildflags",
         "//services/network/public/mojom",
         "//services/service_manager/public/cpp",
      ]

     2.  需要一个工作线程来带动

    std::unique_ptr<base::Thread> server_thread_ = std::make_unique<base::Thread>("mgr_thread");

    server_thread_->StartWithOptions({ base::MessageLoop::TYPE_IO, 0 });

    server_thread_->task_runner()->PostTask(FROM_HERE, base::Bind(&run)); 

  3. 需要实现network::HttpServer::Delegate

class Server : public network::server::HttpServer::Delegate{
public:
  void OnConnect(int connection_id) override
    {
        NOTREACHED();
    }
    
    void OnHttpRequest(int connection_id, const network::server::HttpServerRequestInfo& info) override
    {
        NOTREACHED();
    }


    void OnWebSocketRequest(int connection_id, const network::server::HttpServerRequestInfo& info) override
    {
        NOTREACHED();
    }


    void OnWebSocketMessage(int connection_id, std::string data) override
    {
        NOTREACHED();
    }


    void OnClose(int connection_id) override
    {
        NOTREACHED();
    }
}

 4. 启动Server

void run()
{
       mojo::core::Init();
    std::unique_ptr<network::server::HttpServer> server_;

std::unique_ptr<net::URLRequestContext> url_request_context_ = std::make_unique<net::URLRequestContext>();
std::unique_ptr<network::SocketFactory> factory_ = std::make_unique<network::SocketFactory>(nullptr, url_request_context_.get());

        factory_->CreateTCPServerSocket(
            net::IPEndPoint(net::IPAddress::IPv4Localhost(), 10080)
            , 1
            , TRAFFIC_ANNOTATION_FOR_MXSYNC_REST_SVR
            , mojo::MakeRequest(&server_socket_)
            , base::BindOnce([](int32_t, const base::Optional<net::IPEndPoint>&) {})
        );


        server_.reset(new network::server::HttpServer(std::move(server_socket_), this));
}

5. 参考src/services/network/public/cpp/server/http_server_unittest.cc 里面有完整的HttpClient, HttpServer示例。