update README

README.md

@@ -13,7 +13,7 @@ Drogon is a cross-platform framework, It supports Linux, macOS, FreeBSD, OpenBSD
 
 * Use a non-blocking I/O network lib based on epoll (kqueue under macOS/FreeBSD) to provide high-concurrency, high-performance network IO, please visit the [TFB Tests Results](https://www.techempower.com/benchmarks/#section=data-r19&hw=ph&test=composite) for more details;
 * Provide a completely asynchronous programming mode;
-* Support Http1.0/1.1 (server side and client side);
+* Support HTTP/2 (and 1.0/1.1) client and HTTP 1.1/1.0 server
 * Based on template, a simple reflection mechanism is implemented to completely decouple the main program framework, controllers and views.
 * Support cookies and built-in sessions;
 * Support back-end rendering, the controller generates the data to the view to generate the Html page. Views are described by CSP template files, C++ codes are embedded into Html pages through CSP tags. And the drogon command-line tool automatically generates the C++ code files for compilation;

examples/client_example/main.cc

@@ -16,7 +16,7 @@ int main()
 {
     trantor::Logger::setLogLevel(trantor::Logger::kTrace);
     {
-        auto client = HttpClient::newHttpClient("https://clehaxze.tw:8844",
+        auto client = HttpClient::newHttpClient("https://clehaxze.tw",
                                                 nullptr,
                                                 false,
                                                 false);
@@ -48,7 +48,7 @@ int main()
         req->setParameter("wd", "wx");
         req->setParameter("oq", "wx");
 
-        for (int i = 0; i < 1; ++i)
+        for (int i = 0; i < 2; ++i)
         {
             client->sendRequest(
                 req, [](ReqResult result, const HttpResponsePtr &response) {
@@ -76,7 +76,6 @@ int main()
                 });
             LOG_INFO << "send request";
         }
-
-        app().run();
     }
+    app().run();
 }

lib/src/Http2Transport.h

@@ -5,11 +5,93 @@
 // TOOD: Write our own HPACK implementation
 #include "hpack/HPacker.h"
 
+#include <variant>
+
 namespace drogon
 {
 
 namespace internal
 {
+struct ByteStream;
+struct OByteStream;
+
+struct SettingsFrame
+{
+    bool ack = false;
+    std::vector<std::pair<uint16_t, uint32_t>> settings;
+
+    static std::optional<SettingsFrame> parse(ByteStream &payload,
+                                              uint8_t flags);
+    bool serialize(OByteStream &stream, uint8_t &flags) const;
+};
+
+struct WindowUpdateFrame
+{
+    uint32_t windowSizeIncrement = 0;
+
+    static std::optional<WindowUpdateFrame> parse(ByteStream &payload,
+                                                  uint8_t flags);
+    bool serialize(OByteStream &stream, uint8_t &flags) const;
+};
+
+struct HeadersFrame
+{
+    uint8_t padLength = 0;
+    bool exclusive = false;
+    uint32_t streamDependency = 0;
+    uint8_t weight = 0;
+    std::vector<uint8_t> headerBlockFragment;
+    bool endHeaders = false;
+    bool endStream = false;
+
+    static std::optional<HeadersFrame> parse(ByteStream &payload,
+                                             uint8_t flags);
+    bool serialize(OByteStream &stream, uint8_t &flags) const;
+};
+
+struct GoAwayFrame
+{
+    uint32_t lastStreamId = 0;
+    uint32_t errorCode = 0;
+    std::vector<uint8_t> additionalDebugData;
+
+    static std::optional<GoAwayFrame> parse(ByteStream &payload, uint8_t flags);
+    bool serialize(OByteStream &stream, uint8_t &flags) const;
+};
+
+struct DataFrame
+{
+    uint8_t padLength = 0;
+    std::vector<uint8_t> data;
+    bool endStream = false;
+
+    static std::optional<DataFrame> parse(ByteStream &payload, uint8_t flags);
+    bool serialize(OByteStream &stream, uint8_t &flags) const;
+};
+
+struct PingFrame
+{
+    std::array<uint8_t, 8> opaqueData;
+    bool ack = false;
+
+    static std::optional<PingFrame> parse(ByteStream &payload, uint8_t flags);
+    bool serialize(OByteStream &stream, uint8_t &flags) const;
+};
+
+using H2Frame = std::variant<SettingsFrame,
+                             WindowUpdateFrame,
+                             HeadersFrame,
+                             GoAwayFrame,
+                             DataFrame,
+                             PingFrame>;
+
+enum class StreamState
+{
+    ExpectingHeaders,
+    ExpectingContinuation,
+    ExpectingData,
+    Finished,
+};
 
 // Virtual stream that holds properties for the HTTP/2 stream
 // Defaults to stream 0 global properties
@@ -17,11 +99,32 @@ struct H2Stream
 {
     HttpReqCallback callback;
     HttpResponseImplPtr response;
+    HttpRequestPtr request;
     trantor::MsgBuffer body;
+    std::optional<size_t> contentLength;
+    int32_t streamId = 0;
+    StreamState state = StreamState::ExpectingHeaders;
 };
-
 }  // namespace internal
 
+enum class StreamCloseErrorCode
+{
+    NoError = 0x0,
+    ProtocolError = 0x1,
+    InternalError = 0x2,
+    FlowControlError = 0x3,
+    SettingsTimeout = 0x4,
+    StreamClosed = 0x5,
+    FrameSizeError = 0x6,
+    RefusedStream = 0x7,
+    Cancel = 0x8,
+    CompressionError = 0x9,
+    ConnectError = 0xa,
+    EnhanceYourCalm = 0xb,
+    InadequateSecurity = 0xc,
+    Http11Required = 0xd,
+};
+
 class Http2Transport : public HttpTransport
 {
   private:
@@ -42,9 +145,21 @@ class Http2Transport : public HttpTransport
     size_t maxFrameSize = 16384;
     size_t avaliableWindowSize = 0;
 
+    // Configuration settings
+    const size_t windowIncreaseThreshold = 32768;
+    const size_t windowIncreaseSize = 10 * 1024 * 1024;  // 10 MiB
+
     // Set after server settings are received
     bool serverSettingsReceived = false;
-    std::vector<std::pair<HttpRequestPtr, HttpReqCallback>> bufferedRequests;
+    std::queue<std::pair<HttpRequestPtr, HttpReqCallback>> bufferedRequests;
+    size_t avaliableWindow = 10 * 1024 * 1024;  // 10 MiB
+
+    internal::H2Stream &createStream(int32_t streamId);
+    void streamFinished(internal::H2Stream &stream);
+    void streamFinished(int32_t streamId,
+                        ReqResult result,
+                        StreamCloseErrorCode errorCode,
+                        std::string errorMsg = "");
 
     int32_t nextStreamId()
     {
@@ -78,6 +193,10 @@ class Http2Transport : public HttpTransport
         }
     }
 
+    void handleFrameForStream(const internal::H2Frame &frame,
+                              int32_t streamId,
+                              uint8_t flags);
+
   public:
     Http2Transport(trantor::TcpConnectionPtr connPtr,
                    size_t *bytesSent,
@@ -99,10 +218,7 @@ class Http2Transport : public HttpTransport
             "HTTP/2 handleConnectionClose not implemented");
     }
 
-    void onError(ReqResult result) override
-    {
-        throw std::runtime_error("HTTP/2 onError not implemented");
-    }
+    void onError(ReqResult result) override;
 
   protected:
     void onServerSettingsReceived(){};

lib/src/HttpResponseImpl.cc

@@ -109,6 +109,9 @@ const char *HttpResponseImpl::versionString() const
         case Version::kHttp11:
             result = "HTTP/1.1";
             break;
+        case Version::kHttp2:
+            result = "HTTP/2";
+            break;
 
         default:
             break;