public static async Task WriteContinuation(
this IWriteAndCloseableByteStream stream,
Encoder encoder,
uint streamId,
IEnumerable <HeaderField> headers,
bool endOfHeaders = true)
{
var outBuf = new byte[Settings.Default.MaxFrameSize];
var result = encoder.EncodeInto(new ArraySegment <byte>(outBuf), headers);
// Check if all headers could be encoded
if (result.FieldCount != headers.Count())
{
throw new Exception("Could not encode all headers");
}
byte flags = 0;
if (endOfHeaders)
{
flags |= (byte)ContinuationFrameFlags.EndOfHeaders;
}
var fh = new FrameHeader
{
Type = FrameType.Continuation,
Length = result.UsedBytes,
Flags = flags,
StreamId = streamId,
};
await stream.WriteFrameHeader(fh);
await stream.WriteAsync(
new ArraySegment <byte>(outBuf, 0, result.UsedBytes));
}
public static async Task WriteFrameHeader(
this IWriteAndCloseableByteStream stream,
FrameHeader fh)
{
var headerBytes = new byte[FrameHeader.HeaderSize];
fh.EncodeInto(new ArraySegment <byte>(headerBytes));
await stream.WriteAsync(new ArraySegment <byte>(headerBytes));
}
public static async Task WritePing(
this IWriteAndCloseableByteStream stream, byte[] data, bool isAck)
{
var pingHeader = new FrameHeader
{
Type = FrameType.Ping,
Flags = isAck ? (byte)PingFrameFlags.Ack : (byte)0,
Length = 8,
StreamId = 0,
};
await stream.WriteFrameHeader(pingHeader);
await stream.WriteAsync(new ArraySegment <byte>(data, 0, 8));
}
public static async Task WriteWithTimeout(
this IWriteAndCloseableByteStream stream, ArraySegment <byte> buf)
{
var writeTask = stream.WriteAsync(buf);
var timeoutTask = Task.Delay(WriteTimeout);
var combined = Task.WhenAny(new Task[] { writeTask, timeoutTask });
var done = await combined;
if (done == writeTask)
{
await writeTask;
return;
}
throw new TimeoutException();
}
public static async Task WriteSettings(
this IWriteAndCloseableByteStream stream, Settings settings)
{
var settingsData = new byte[settings.RequiredSize];
var fh = new FrameHeader
{
Type = FrameType.Settings,
Length = settingsData.Length,
Flags = 0,
StreamId = 0,
};
settings.EncodeInto(new ArraySegment <byte>(settingsData));
await stream.WriteFrameHeader(fh);
await stream.WriteAsync(new ArraySegment <byte>(settingsData));
}
public static async Task WritePriority(
this IWriteAndCloseableByteStream stream,
uint streamId, PriorityData prioData)
{
var fh = new FrameHeader
{
Type = FrameType.Priority,
Flags = 0,
Length = PriorityData.Size,
StreamId = streamId,
};
await stream.WriteFrameHeader(fh);
var payload = new byte[PriorityData.Size];
prioData.EncodeInto(new ArraySegment <byte>(payload));
await stream.WriteAsync(new ArraySegment <byte>(payload));
}
public static async Task WriteResetStream(
this IWriteAndCloseableByteStream stream, uint streamId, ErrorCode errc)
{
var fh = new FrameHeader
{
Type = FrameType.ResetStream,
Flags = 0,
Length = ResetFrameData.Size,
StreamId = streamId,
};
var data = new ResetFrameData
{
ErrorCode = errc,
};
var dataBytes = new byte[ResetFrameData.Size];
data.EncodeInto(new ArraySegment <byte>(dataBytes));
await stream.WriteFrameHeader(fh);
await stream.WriteAsync(new ArraySegment <byte>(dataBytes));
}
public static async Task WriteWindowUpdate(
this IWriteAndCloseableByteStream stream, uint streamId, int amount)
{
var windowUpdateHeader = new FrameHeader
{
Type = FrameType.WindowUpdate,
Flags = 0,
Length = WindowUpdateData.Size,
StreamId = streamId,
};
var data = new WindowUpdateData
{
WindowSizeIncrement = amount,
};
var dataBytes = new byte[WindowUpdateData.Size];
data.EncodeInto(new ArraySegment <byte>(dataBytes));
await stream.WriteFrameHeader(windowUpdateHeader);
await stream.WriteAsync(new ArraySegment <byte>(dataBytes));
}
public static async Task WriteGoAway(
this IWriteAndCloseableByteStream stream,
uint lastStreamId,
ErrorCode errc,
byte[] debugData = null)
{
if (debugData == null)
{
debugData = new byte[0];
}
var goAwayData = new GoAwayFrameData
{
Reason = new GoAwayReason
{
LastStreamId = lastStreamId,
ErrorCode = errc,
DebugData = new ArraySegment <byte>(debugData),
},
};
var fh = new FrameHeader
{
Type = FrameType.GoAway,
Flags = 0,
StreamId = 0,
Length = goAwayData.RequiredSize,
};
var dataBytes = new byte[goAwayData.RequiredSize];
goAwayData.EncodeInto(new ArraySegment <byte>(dataBytes));
await stream.WriteFrameHeader(fh);
await stream.WriteAsync(new ArraySegment <byte>(dataBytes));
}
static async Task HandleConnection(
ILoggerProvider logProvider,
ConnectionConfiguration config,
bool useUpgrade,
IReadableByteStream inputStream,
IWriteAndCloseableByteStream outputStream,
int connectionId)
{
var upgradeReadStream = new UpgradeReadStream(inputStream);
ServerUpgradeRequest upgrade = null;
try
{
// Wait for either HTTP/1 upgrade header or HTTP/2 magic header
await upgradeReadStream.WaitForHttpHeader();
var headerBytes = upgradeReadStream.HeaderBytes;
if (MaybeHttpStart(headerBytes))
{
// This seems to be a HTTP/2 request
// No upgrade necessary
// Make the header rereadable by the stream reader consumer,
// so that the library can also read the preface
upgradeReadStream.UnreadHttpHeader();
}
else
{
// This seems to be a HTTP/1 request
// Parse the header and check whether it's an upgrade
var request = Http1Request.ParseFrom(
Encoding.ASCII.GetString(
headerBytes.Array, headerBytes.Offset, headerBytes.Count - 4));
// Assure that the HTTP/2 library does not get passed the HTTP/1 request
upgradeReadStream.ConsumeHttpHeader();
if (request.Protocol != "HTTP/1.1")
{
throw new Exception("Invalid upgrade request");
}
// If the request has some payload we can't process it in this demo
string contentLength;
if (request.Headers.TryGetValue("content-length", out contentLength))
{
await outputStream.WriteAsync(
new ArraySegment <byte>(UpgradeErrorResponse));
await outputStream.CloseAsync();
return;
}
string connectionHeader;
string hostHeader;
string upgradeHeader;
string http2SettingsHeader;
if (!request.Headers.TryGetValue("connection", out connectionHeader) ||
!request.Headers.TryGetValue("host", out hostHeader) ||
!request.Headers.TryGetValue("upgrade", out upgradeHeader) ||
!request.Headers.TryGetValue("http2-settings", out http2SettingsHeader) ||
upgradeHeader != "h2c" ||
http2SettingsHeader.Length == 0)
{
throw new Exception("Invalid upgrade request");
}
var connParts =
connectionHeader
.Split(new char[] { ',' })
.Select(p => p.Trim())
.ToArray();
if (connParts.Length != 2 ||
!connParts.Contains("Upgrade") ||
!connParts.Contains("HTTP2-Settings"))
{
throw new Exception("Invalid upgrade request");
}
var headers = new List <HeaderField>();
headers.Add(new HeaderField {
Name = ":method", Value = request.Method
});
headers.Add(new HeaderField {
Name = ":path", Value = request.Path
});
headers.Add(new HeaderField {
Name = ":scheme", Value = "http"
});
foreach (var kvp in request.Headers)
{
// Skip Connection upgrade related headers
if (kvp.Key == "connection" ||
kvp.Key == "upgrade" ||
kvp.Key == "http2-settings")
{
continue;
}
headers.Add(new HeaderField
{
Name = kvp.Key,
Value = kvp.Value,
});
}
var upgradeBuilder = new ServerUpgradeRequestBuilder();
upgradeBuilder.SetHeaders(headers);
upgradeBuilder.SetHttp2Settings(http2SettingsHeader);
upgrade = upgradeBuilder.Build();
if (!upgrade.IsValid)
{
await outputStream.WriteAsync(
new ArraySegment <byte>(UpgradeErrorResponse));
await outputStream.CloseAsync();
return;
}
// Respond to upgrade
await outputStream.WriteAsync(
new ArraySegment <byte>(UpgradeSuccessResponse));
}
}
catch (Exception e)
{
Console.WriteLine("Error during connection upgrade: {0}", e.Message);
await outputStream.CloseAsync();
return;
}
// Build a HTTP connection on top of the stream abstraction
var http2Con = new Connection(
config, upgradeReadStream, outputStream,
options: new Connection.Options
{
Logger = logProvider.CreateLogger("HTTP2Conn" + connectionId),
ServerUpgradeRequest = upgrade,
});
// Close the connection if we get a GoAway from the client
var remoteGoAwayTask = http2Con.RemoteGoAwayReason;
var closeWhenRemoteGoAway = Task.Run(async() =>
{
await remoteGoAwayTask;
await http2Con.GoAwayAsync(ErrorCode.NoError, true);
});
}
