Exemple #1
0
        private static void FinishRequest(HTTP2Stream stream, FramesAsStreamView dataStream)
        {
            if (dataStream != null)
            {
                stream.response.AddData(dataStream);

                dataStream.Close();
            }

            bool resendRequest;
            HTTPConnectionStates proposedConnectionStates;
            KeepAliveHeader      keepAliveHeader = null;

            ConnectionHelper.HandleResponse("HTTP2Stream", stream.AssignedRequest, out resendRequest, out proposedConnectionStates, ref keepAliveHeader, stream.Context, stream.AssignedRequest.Context);

            if (resendRequest && !stream.AssignedRequest.IsCancellationRequested)
            {
                RequestEventHelper.EnqueueRequestEvent(new RequestEventInfo(stream.AssignedRequest, RequestEvents.Resend));
            }
            else if (stream.AssignedRequest.State == HTTPRequestStates.Processing && !stream.AssignedRequest.IsCancellationRequested)
            {
                stream.AssignedRequest.State = HTTPRequestStates.Finished;
            }
            else
            {
                if (stream.AssignedRequest.State == HTTPRequestStates.Processing && stream.AssignedRequest.IsCancellationRequested)
                {
                    stream.AssignedRequest.State = stream.AssignedRequest.IsTimedOut ? HTTPRequestStates.TimedOut : HTTPRequestStates.Aborted;
                }
            }
        }
        public void Encode(HTTP2Stream context, HTTPRequest request, Queue <HTTP2FrameHeaderAndPayload> to, UInt32 streamId)
        {
            // Add usage of SETTINGS_MAX_HEADER_LIST_SIZE to be able to create a header and one or more continuation fragments
            // (https://httpwg.org/specs/rfc7540.html#SettingValues)

            using (BufferPoolMemoryStream bufferStream = new BufferPoolMemoryStream())
            {
                WriteHeader(bufferStream, ":method", HTTPRequest.MethodNames[(int)request.MethodType]);
                // add path
                WriteHeader(bufferStream, ":path", request.CurrentUri.PathAndQuery);
                // add authority
                WriteHeader(bufferStream, ":authority", request.CurrentUri.Authority);
                // add scheme
                WriteHeader(bufferStream, ":scheme", "https");

                //bool hasBody = false;

                // add other, regular headers
                request.EnumerateHeaders((header, values) =>
                {
                    if (header.Equals("connection", StringComparison.OrdinalIgnoreCase) ||
                        header.Equals("te", StringComparison.OrdinalIgnoreCase) ||
                        header.Equals("host", StringComparison.OrdinalIgnoreCase))
                    {
                        return;
                    }

                    //if (!hasBody)
                    //    hasBody = header.Equals("content-length", StringComparison.OrdinalIgnoreCase) && int.Parse(values[0]) > 0;

                    // https://httpwg.org/specs/rfc7540.html#HttpSequence
                    // The chunked transfer encoding defined in Section 4.1 of [RFC7230] MUST NOT be used in HTTP/2.
                    if (header.Equals("Transfer-Encoding", StringComparison.OrdinalIgnoreCase))
                    {
                        // error!
                    }

                    for (int i = 0; i < values.Count; ++i)
                    {
                        WriteHeader(bufferStream, header, values[i]);

                        if (HTTPManager.Logger.Level <= Logger.Loglevels.Information)
                        {
                            HTTPManager.Logger.Information("HPACKEncoder", string.Format("[{0}] - Encode - Header({1}/{2}): '{3}': '{4}'", context.Id, i + 1, values.Count, header, values[i]));
                        }
                    }
                }, true);

                byte[] requestBody = request.GetEntityBody();
                CreateHeaderFrames(to,
                                   streamId,
                                   bufferStream.ToArray(true),
                                   (UInt32)bufferStream.Length,
                                   requestBody != null && requestBody.Length > 0 /*hasBody*/);
            }
        }
        private static void FinishRequest(HTTP2Stream stream, FramesAsStreamView dataStream)
        {
            if (dataStream != null)
            {
                try
                {
                    stream.response.AddData(dataStream);
                }
                finally
                {
                    dataStream.Close();
                }
            }

            stream.AssignedRequest.Timing.Add(TimingEventNames.Response_Received);

            bool resendRequest;
            HTTPConnectionStates proposedConnectionStates; // ignored
            KeepAliveHeader      keepAliveHeader = null;   // ignored

            ConnectionHelper.HandleResponse("HTTP2Stream", stream.AssignedRequest, out resendRequest, out proposedConnectionStates, ref keepAliveHeader, stream.Context, stream.AssignedRequest.Context);

            if (resendRequest && !stream.AssignedRequest.IsCancellationRequested)
            {
                RequestEventHelper.EnqueueRequestEvent(new RequestEventInfo(stream.AssignedRequest, RequestEvents.Resend));
            }
            else if (stream.AssignedRequest.State == HTTPRequestStates.Processing && !stream.AssignedRequest.IsCancellationRequested)
            {
                stream.AssignedRequest.State = HTTPRequestStates.Finished;
            }
            else
            {
                // Already set in HTTPRequest's Abort().
                //if (stream.AssignedRequest.State == HTTPRequestStates.Processing && stream.AssignedRequest.IsCancellationRequested)
                //    stream.AssignedRequest.State = stream.AssignedRequest.IsTimedOut ? HTTPRequestStates.TimedOut : HTTPRequestStates.Aborted;
            }
        }
        public void RunHandler()
        {
            HTTPManager.Logger.Information("HTTP2Handler", "Processing thread up and running!");

            Thread.CurrentThread.Name = "HTTP2 Process";

            PlatformSupport.Threading.ThreadedRunner.RunLongLiving(ReadThread);

            try
            {
                bool atLeastOneStreamHasAFrameToSend = true;

                this.HPACKEncoder = new HPACKEncoder(this.settings);

                // https://httpwg.org/specs/rfc7540.html#InitialWindowSize
                // The connection flow-control window is also 65,535 octets.
                this.remoteWindow = this.settings.RemoteSettings[HTTP2Settings.INITIAL_WINDOW_SIZE];

                // we want to pack as many data as we can in one tcp segment, but setting the buffer's size too high
                //  we might keep data too long and send them in bursts instead of in a steady stream.
                // Keeping it too low might result in a full tcp segment and one with very low payload
                // Is it possible that one full tcp segment sized buffer would be the best, or multiple of it.
                // It would keep the network busy without any fragments. The ethernet layer has a maximum of 1500 bytes,
                // but there's two layers of 20 byte headers each, so as a theoretical maximum it's 1500-20-20 bytes.
                // On the other hand, if the buffer is small (1-2), that means that for larger data, we have to do a lot
                // of system calls, in that case a larger buffer might be better. Still, if we are not cpu bound,
                // a well saturated network might serve us better.
                using (WriteOnlyBufferedStream bufferedStream = new WriteOnlyBufferedStream(this.conn.connector.Stream, 1024 * 1024 /*1500 - 20 - 20*/))
                {
                    // The client connection preface starts with a sequence of 24 octets
                    bufferedStream.Write(MAGIC, 0, MAGIC.Length);

                    // This sequence MUST be followed by a SETTINGS frame (Section 6.5), which MAY be empty.
                    // The client sends the client connection preface immediately upon receipt of a
                    // 101 (Switching Protocols) response (indicating a successful upgrade)
                    // or as the first application data octets of a TLS connection

                    // Set streams' initial window size to its maximum.
                    this.settings.InitiatedMySettings[HTTP2Settings.INITIAL_WINDOW_SIZE]    = HTTPManager.HTTP2Settings.InitialStreamWindowSize;
                    this.settings.InitiatedMySettings[HTTP2Settings.MAX_CONCURRENT_STREAMS] = HTTPManager.HTTP2Settings.MaxConcurrentStreams;
                    this.settings.SendChanges(this.outgoingFrames);

                    // The default window size for the whole connection is 65535 bytes,
                    // but we want to set it to the maximum possible value.
                    Int64 diff = HTTPManager.HTTP2Settings.InitialConnectionWindowSize - 65535;
                    if (diff > 0)
                    {
                        this.outgoingFrames.Add(HTTP2FrameHelper.CreateWindowUpdateFrame(0, (UInt32)diff));
                    }

                    this.pingFrequency = HTTPManager.HTTP2Settings.PingFrequency;

                    while (this.isRunning)
                    {
                        if (!atLeastOneStreamHasAFrameToSend)
                        {
                            // buffered stream will call flush automatically if its internal buffer is full.
                            // But we have to make it sure that we flush remaining data before we go to sleep.
                            bufferedStream.Flush();

                            // Wait until we have to send the next ping, OR a new frame is received on the read thread.
                            //   Sent      Now  Sent+frequency
                            //-----|--------|----|------------
                            int wait = (int)((this.lastPingSent + this.pingFrequency) - DateTime.UtcNow).TotalMilliseconds;

                            wait = (int)Math.Min(wait, this.MaxGoAwayWaitTime.TotalMilliseconds);

                            if (wait >= 1)
                            {
                                if (HTTPManager.Logger.Level <= Logger.Loglevels.All)
                                {
                                    HTTPManager.Logger.Information("HTTP2Handler", string.Format("Sleeping for {0:N0}ms", wait));
                                }
                                this.newFrameSignal.WaitOne(wait);
                            }
                        }

                        DateTime now = DateTime.UtcNow;

                        if (now - this.lastPingSent >= this.pingFrequency)
                        {
                            this.lastPingSent = now;

                            var frame = HTTP2FrameHelper.CreatePingFrame(HTTP2PingFlags.None);
                            BufferHelper.SetLong(frame.Payload, 0, now.Ticks);

                            this.outgoingFrames.Add(frame);
                        }

                        // Process received frames
                        HTTP2FrameHeaderAndPayload header;
                        while (this.newFrames.TryDequeue(out header))
                        {
                            if (header.StreamId > 0)
                            {
                                HTTP2Stream http2Stream = FindStreamById(header.StreamId);

                                // Add frame to the stream, so it can process it when its Process function is called
                                if (http2Stream != null)
                                {
                                    http2Stream.AddFrame(header, this.outgoingFrames);
                                }
                                else
                                {
                                    // Error? It's possible that we closed and removed the stream while the server was in the middle of sending frames
                                    //HTTPManager.Logger.Warning("HTTP2Handler", string.Format("No stream found for id: {0}! Can't deliver frame: {1}", header.StreamId, header));
                                }
                            }
                            else
                            {
                                switch (header.Type)
                                {
                                case HTTP2FrameTypes.SETTINGS:
                                    this.settings.Process(header, this.outgoingFrames);
                                    break;

                                case HTTP2FrameTypes.PING:
                                    var pingFrame = HTTP2FrameHelper.ReadPingFrame(header);

                                    // if it wasn't an ack for our ping, we have to send one
                                    if ((pingFrame.Flags & HTTP2PingFlags.ACK) == 0)
                                    {
                                        var frame = HTTP2FrameHelper.CreatePingFrame(HTTP2PingFlags.ACK);
                                        Array.Copy(pingFrame.OpaqueData, 0, frame.Payload, 0, pingFrame.OpaqueDataLength);

                                        this.outgoingFrames.Add(frame);
                                    }
                                    break;

                                case HTTP2FrameTypes.WINDOW_UPDATE:
                                    var windowUpdateFrame = HTTP2FrameHelper.ReadWindowUpdateFrame(header);
                                    this.remoteWindow += windowUpdateFrame.WindowSizeIncrement;
                                    break;

                                case HTTP2FrameTypes.GOAWAY:
                                    // parse the frame, so we can print out detailed information
                                    HTTP2GoAwayFrame goAwayFrame = HTTP2FrameHelper.ReadGoAwayFrame(header);

                                    HTTPManager.Logger.Information("HTTP2Handler", "Received GOAWAY frame: " + goAwayFrame.ToString());

                                    string msg = string.Format("Server closing the connection! Error code: {0} ({1})", goAwayFrame.Error, goAwayFrame.ErrorCode);
                                    for (int i = 0; i < this.clientInitiatedStreams.Count; ++i)
                                    {
                                        this.clientInitiatedStreams[i].Abort(msg);
                                    }

                                    // set the running flag to false, so the thread can exit
                                    this.isRunning = false;

                                    this.conn.State = HTTPConnectionStates.Closed;
                                    break;

                                case HTTP2FrameTypes.ALT_SVC:
                                    //HTTP2AltSVCFrame altSvcFrame = HTTP2FrameHelper.ReadAltSvcFrame(header);

                                    // Implement
                                    //HTTPManager.EnqueuePluginEvent(new PluginEventInfo(PluginEvents.AltSvcHeader, new AltSvcEventInfo(altSvcFrame.Origin, ))
                                    break;
                                }
                            }
                        }

                        UInt32 maxConcurrentStreams = Math.Min(HTTPManager.HTTP2Settings.MaxConcurrentStreams, this.settings.RemoteSettings[HTTP2Settings.MAX_CONCURRENT_STREAMS]);

                        // pre-test stream count to lock only when truly needed.
                        if (this.clientInitiatedStreams.Count < maxConcurrentStreams && this.isRunning)
                        {
                            // grab requests from queue
                            HTTPRequest request;
                            while (this.clientInitiatedStreams.Count < maxConcurrentStreams && this.requestQueue.TryDequeue(out request))
                            {
                                // create a new stream
                                var newStream = new HTTP2Stream((UInt32)Interlocked.Add(ref LastStreamId, 2), this.settings, this.HPACKEncoder);

                                // process the request
                                newStream.Assign(request);

                                this.clientInitiatedStreams.Add(newStream);
                            }
                        }

                        // send any settings changes
                        this.settings.SendChanges(this.outgoingFrames);

                        atLeastOneStreamHasAFrameToSend = false;

                        // process other streams
                        // Room for improvement Streams should be processed by their priority!
                        for (int i = 0; i < this.clientInitiatedStreams.Count; ++i)
                        {
                            var stream = this.clientInitiatedStreams[i];
                            stream.Process(this.outgoingFrames);

                            // remove closed, empty streams (not enough to check the closed flag, a closed stream still can contain frames to send)
                            if (stream.State == HTTP2StreamStates.Closed && !stream.HasFrameToSend)
                            {
                                this.clientInitiatedStreams.RemoveAt(i--);
                                stream.Removed();
                            }

                            atLeastOneStreamHasAFrameToSend |= stream.HasFrameToSend;

                            this.lastInteraction = DateTime.UtcNow;
                        }

                        // If we encounter a data frame that too large for the current remote window, we have to stop
                        // sending all data frames as we could send smaller data frames before the large ones.
                        // Room for improvement: An improvement would be here to stop data frame sending per-stream.
                        bool haltDataSending = false;

                        if (this.ShutdownType == ShutdownTypes.Running && now - this.lastInteraction >= HTTPManager.HTTP2Settings.MaxIdleTime)
                        {
                            this.lastInteraction = DateTime.UtcNow;
                            HTTPManager.Logger.Information("HTTP2Handler", "Reached idle time, sending GoAway frame!");
                            this.outgoingFrames.Add(HTTP2FrameHelper.CreateGoAwayFrame(0, HTTP2ErrorCodes.NO_ERROR));
                            this.goAwaySentAt = DateTime.UtcNow;
                        }

                        // https://httpwg.org/specs/rfc7540.html#GOAWAY
                        // Endpoints SHOULD always send a GOAWAY frame before closing a connection so that the remote peer can know whether a stream has been partially processed or not.
                        if (this.ShutdownType == ShutdownTypes.Gentle)
                        {
                            HTTPManager.Logger.Information("HTTP2Handler", "Connection abort requested, sending GoAway frame!");

                            this.outgoingFrames.Clear();
                            this.outgoingFrames.Add(HTTP2FrameHelper.CreateGoAwayFrame(0, HTTP2ErrorCodes.NO_ERROR));
                            this.goAwaySentAt = DateTime.UtcNow;
                        }

                        if (this.isRunning && now - goAwaySentAt >= this.MaxGoAwayWaitTime)
                        {
                            HTTPManager.Logger.Information("HTTP2Handler", "No GoAway frame received back. Really quitting now!");
                            this.isRunning = false;
                            conn.State     = HTTPConnectionStates.Closed;
                        }

                        uint streamWindowUpdates = 0;

                        // Go through all the collected frames and send them.
                        for (int i = 0; i < this.outgoingFrames.Count; ++i)
                        {
                            var frame = this.outgoingFrames[i];

                            if (HTTPManager.Logger.Level <= Logger.Loglevels.All && frame.Type != HTTP2FrameTypes.DATA /*&& frame.Type != HTTP2FrameTypes.PING*/)
                            {
                                HTTPManager.Logger.Information("HTTP2Handler", "Sending frame: " + frame.ToString());
                            }

                            // post process frames
                            switch (frame.Type)
                            {
                            case HTTP2FrameTypes.DATA:
                                if (haltDataSending)
                                {
                                    continue;
                                }

                                // if the tracked remoteWindow is smaller than the frame's payload, we stop sending
                                // data frames until we receive window-update frames
                                if (frame.PayloadLength > this.remoteWindow)
                                {
                                    haltDataSending = true;
                                    HTTPManager.Logger.Warning("HTTP2Handler", string.Format("Data sending halted for this round. Remote Window: {0:N0}, frame: {1}", this.remoteWindow, frame.ToString()));
                                    continue;
                                }

                                break;

                            case HTTP2FrameTypes.WINDOW_UPDATE:
                                if (frame.StreamId > 0)
                                {
                                    streamWindowUpdates += BufferHelper.ReadUInt31(frame.Payload, 0);
                                }
                                break;
                            }

                            this.outgoingFrames.RemoveAt(i--);

                            using (var buffer = HTTP2FrameHelper.HeaderAsBinary(frame))
                                bufferedStream.Write(buffer.Data, 0, buffer.Length);

                            if (frame.PayloadLength > 0)
                            {
                                bufferedStream.Write(frame.Payload, (int)frame.PayloadOffset, (int)frame.PayloadLength);

                                if (!frame.DontUseMemPool)
                                {
                                    BufferPool.Release(frame.Payload);
                                }
                            }

                            if (frame.Type == HTTP2FrameTypes.DATA)
                            {
                                this.remoteWindow -= frame.PayloadLength;
                            }
                        }

                        if (streamWindowUpdates > 0)
                        {
                            var frame = HTTP2FrameHelper.CreateWindowUpdateFrame(0, streamWindowUpdates);

                            if (HTTPManager.Logger.Level <= Logger.Loglevels.All)
                            {
                                HTTPManager.Logger.Information("HTTP2Handler", "Sending frame: " + frame.ToString());
                            }

                            using (var buffer = HTTP2FrameHelper.HeaderAsBinary(frame))
                                bufferedStream.Write(buffer.Data, 0, buffer.Length);

                            bufferedStream.Write(frame.Payload, (int)frame.PayloadOffset, (int)frame.PayloadLength);
                        }
                    } // while (this.isRunning)

                    bufferedStream.Flush();
                }
            }
            catch (Exception ex)
            {
                // Log out the exception if it's a non-expected one.
                if (this.ShutdownType == ShutdownTypes.Running && this.goAwaySentAt == DateTime.MaxValue)
                {
                    HTTPManager.Logger.Exception("HTTP2Handler", "Sender thread", ex);
                }
            }
            finally
            {
                // First thread closing notifies the ConnectionEventHelper
                if (Interlocked.Increment(ref this.threadExitCount) == 1)
                {
                    ConnectionEventHelper.EnqueueConnectionEvent(new ConnectionEventInfo(this.conn, HTTPConnectionStates.Closed));
                }

                HTTPManager.Logger.Information("HTTP2Handler", "Sender thread closing - cleaning up remaining request...");

                for (int i = 0; i < this.clientInitiatedStreams.Count; ++i)
                {
                    this.clientInitiatedStreams[i].Abort("Connection closed unexpectedly");
                }
                this.clientInitiatedStreams.Clear();

                HTTPRequest request = null;
                while (this.requestQueue.TryDequeue(out request))
                {
                    HTTPManager.Logger.Information("HTTP2Handler", string.Format("Request '{0}' IsCancellationRequested: {1}", request.CurrentUri.ToString(), request.IsCancellationRequested.ToString()));
                    if (request.IsCancellationRequested)
                    {
                        request.Response = null;
                        request.State    = HTTPRequestStates.Aborted;
                    }
                    else
                    {
                        RequestEventHelper.EnqueueRequestEvent(new RequestEventInfo(request, RequestEvents.Resend));
                    }
                }

                HTTPManager.Logger.Information("HTTP2Handler", "Sender thread closing");
            }

            try
            {
                // Works in the new runtime
                if (this.conn.connector.TopmostStream != null)
                {
                    using (this.conn.connector.TopmostStream) { }
                }

                // Works in the old runtime
                if (this.conn.connector.Stream != null)
                {
                    using (this.conn.connector.Stream) { }
                }
            }
            catch
            { }
        }
        public void Decode(HTTP2Stream context, Stream stream, List <KeyValuePair <string, string> > to)
        {
            int headerType = stream.ReadByte();

            while (headerType != -1)
            {
                byte firstDataByte = (byte)headerType;

                // https://http2.github.io/http2-spec/compression.html#indexed.header.representation
                if (BufferHelper.ReadBit(firstDataByte, 0) == 1)
                {
                    var header = ReadIndexedHeader(firstDataByte, stream);

                    if (HTTPManager.Logger.Level <= Logger.Loglevels.Information)
                    {
                        HTTPManager.Logger.Information("HPACKEncoder", string.Format("[{0}] Decode - IndexedHeader: {1}", context.Id, header.ToString()));
                    }

                    to.Add(header);
                }
                else if (BufferHelper.ReadValue(firstDataByte, 0, 1) == 1)
                {
                    // https://http2.github.io/http2-spec/compression.html#literal.header.with.incremental.indexing

                    if (BufferHelper.ReadValue(firstDataByte, 2, 7) == 0)
                    {
                        // Literal Header Field with Incremental Indexing — New Name
                        var header = ReadLiteralHeaderFieldWithIncrementalIndexing_NewName(firstDataByte, stream);

                        if (HTTPManager.Logger.Level <= Logger.Loglevels.Information)
                        {
                            HTTPManager.Logger.Information("HPACKEncoder", string.Format("[{0}] Decode - LiteralHeaderFieldWithIncrementalIndexing_NewName: {1}", context.Id, header.ToString()));
                        }

                        this.responseTable.Add(header);
                        to.Add(header);
                    }
                    else
                    {
                        // Literal Header Field with Incremental Indexing — Indexed Name
                        var header = ReadLiteralHeaderFieldWithIncrementalIndexing_IndexedName(firstDataByte, stream);

                        if (HTTPManager.Logger.Level <= Logger.Loglevels.Information)
                        {
                            HTTPManager.Logger.Information("HPACKEncoder", string.Format("[{0}] Decode - LiteralHeaderFieldWithIncrementalIndexing_IndexedName: {1}", context.Id, header.ToString()));
                        }

                        this.responseTable.Add(header);
                        to.Add(header);
                    }
                }
                else if (BufferHelper.ReadValue(firstDataByte, 0, 3) == 0)
                {
                    // https://http2.github.io/http2-spec/compression.html#literal.header.without.indexing

                    if (BufferHelper.ReadValue(firstDataByte, 4, 7) == 0)
                    {
                        // Literal Header Field without Indexing — New Name
                        var header = ReadLiteralHeaderFieldwithoutIndexing_NewName(firstDataByte, stream);

                        if (HTTPManager.Logger.Level <= Logger.Loglevels.Information)
                        {
                            HTTPManager.Logger.Information("HPACKEncoder", string.Format("[{0}] Decode - LiteralHeaderFieldwithoutIndexing_NewName: {1}", context.Id, header.ToString()));
                        }

                        to.Add(header);
                    }
                    else
                    {
                        // Literal Header Field without Indexing — Indexed Name
                        var header = ReadLiteralHeaderFieldwithoutIndexing_IndexedName(firstDataByte, stream);

                        if (HTTPManager.Logger.Level <= Logger.Loglevels.Information)
                        {
                            HTTPManager.Logger.Information("HPACKEncoder", string.Format("[{0}] Decode - LiteralHeaderFieldwithoutIndexing_IndexedName: {1}", context.Id, header.ToString()));
                        }

                        to.Add(header);
                    }
                }
                else if (BufferHelper.ReadValue(firstDataByte, 0, 3) == 1)
                {
                    // https://http2.github.io/http2-spec/compression.html#literal.header.never.indexed

                    if (BufferHelper.ReadValue(firstDataByte, 4, 7) == 0)
                    {
                        // Literal Header Field Never Indexed — New Name
                        var header = ReadLiteralHeaderFieldNeverIndexed_NewName(firstDataByte, stream);

                        if (HTTPManager.Logger.Level <= Logger.Loglevels.Information)
                        {
                            HTTPManager.Logger.Information("HPACKEncoder", string.Format("[{0}] Decode - LiteralHeaderFieldNeverIndexed_NewName: {1}", context.Id, header.ToString()));
                        }

                        to.Add(header);
                    }
                    else
                    {
                        // Literal Header Field Never Indexed — Indexed Name
                        var header = ReadLiteralHeaderFieldNeverIndexed_IndexedName(firstDataByte, stream);

                        if (HTTPManager.Logger.Level <= Logger.Loglevels.Information)
                        {
                            HTTPManager.Logger.Information("HPACKEncoder", string.Format("[{0}] Decode - LiteralHeaderFieldNeverIndexed_IndexedName: {1}", context.Id, header.ToString()));
                        }

                        to.Add(header);
                    }
                }
                else if (BufferHelper.ReadValue(firstDataByte, 0, 2) == 1)
                {
                    // https://http2.github.io/http2-spec/compression.html#encoding.context.update

                    UInt32 newMaxSize = DecodeInteger(5, firstDataByte, stream);

                    if (HTTPManager.Logger.Level <= Logger.Loglevels.Information)
                    {
                        HTTPManager.Logger.Information("HPACKEncoder", string.Format("[{0}] Decode - Dynamic Table Size Update: {1}", context.Id, newMaxSize));
                    }

                    //this.settingsRegistry[HTTP2Settings.HEADER_TABLE_SIZE] = (UInt16)newMaxSize;
                    this.responseTable.MaxDynamicTableSize = (UInt16)newMaxSize;
                }
                else
                {
                    // ERROR
                }

                headerType = stream.ReadByte();
            }
        }
Exemple #6
0
        public void Encode(HTTP2Stream context, HTTPRequest request, Queue <HTTP2FrameHeaderAndPayload> to, UInt32 streamId)
        {
            // Add usage of SETTINGS_MAX_HEADER_LIST_SIZE to be able to create a header and one or more continuation fragments
            // (https://httpwg.org/specs/rfc7540.html#SettingValues)

            using (BufferPoolMemoryStream bufferStream = new BufferPoolMemoryStream())
            {
                WriteHeader(bufferStream, ":method", HTTPRequest.MethodNames[(int)request.MethodType]);
                // add path
                WriteHeader(bufferStream, ":path", request.CurrentUri.PathAndQuery);
                // add authority
                WriteHeader(bufferStream, ":authority", request.CurrentUri.Authority);
                // add scheme
                WriteHeader(bufferStream, ":scheme", "https");

                //bool hasBody = false;

                // add other, regular headers
                request.EnumerateHeaders((header, values) =>
                {
                    if (header.Equals("connection", StringComparison.OrdinalIgnoreCase) ||
                        header.Equals("te", StringComparison.OrdinalIgnoreCase) ||
                        header.Equals("host", StringComparison.OrdinalIgnoreCase))
                    {
                        return;
                    }

                    //if (!hasBody)
                    //    hasBody = header.Equals("content-length", StringComparison.OrdinalIgnoreCase) && int.Parse(values[0]) > 0;

                    // https://httpwg.org/specs/rfc7540.html#HttpSequence
                    // The chunked transfer encoding defined in Section 4.1 of [RFC7230] MUST NOT be used in HTTP/2.
                    if (header.Equals("Transfer-Encoding", StringComparison.OrdinalIgnoreCase))
                    {
                        // error!
                        return;
                    }

                    // https://httpwg.org/specs/rfc7540.html#HttpHeaders
                    // Just as in HTTP/1.x, header field names are strings of ASCII characters that are compared in a case-insensitive fashion.
                    // However, header field names MUST be converted to lowercase prior to their encoding in HTTP/2.
                    // A request or response containing uppercase header field names MUST be treated as malformed
                    if (header.Any(Char.IsUpper))
                    {
                        header = header.ToLower();
                    }

                    for (int i = 0; i < values.Count; ++i)
                    {
                        WriteHeader(bufferStream, header, values[i]);

                        if (HTTPManager.Logger.Level <= Logger.Loglevels.Information)
                        {
                            HTTPManager.Logger.Information("HPACKEncoder", string.Format("[{0}] - Encode - Header({1}/{2}): '{3}': '{4}'", context.Id, i + 1, values.Count, header, values[i]), this.parent.Context, context.Context, request.Context);
                        }
                    }
                }, true);

                var upStreamInfo = request.GetUpStream();
                CreateHeaderFrames(to,
                                   streamId,
                                   bufferStream.ToArray(true),
                                   (UInt32)bufferStream.Length,
                                   upStreamInfo.Stream != null);
            }
        }