async Task <Connection> CreateUpgradeConnection(string host, int port)
{
// HTTP/2 settings
var config =
new ConnectionConfigurationBuilder(false)
.UseSettings(Settings.Default)
.UseHuffmanStrategy(HuffmanStrategy.IfSmaller)
.Build();
// Prepare connection upgrade
var upgrade =
new ClientUpgradeRequestBuilder()
.SetHttp2Settings(config.Settings)
.Build();
// Create a TCP connection
logger.LogInformation($"Starting to connect to {host}:{port}");
var tcpClient = new TcpClient();
await tcpClient.ConnectAsync(host, port);
tcpClient.Client.NoDelay = true;
logger.LogInformation("Connected to remote");
// Create HTTP/2 stream abstraction on top of the socket
var wrappedStreams = tcpClient.Client.CreateStreams();
var upgradeReadStream = new UpgradeReadStream(wrappedStreams.ReadableStream);
var needExplicitStreamClose = true;
try
{
// Send a HTTP/1.1 upgrade request with the necessary fields
var upgradeHeader =
"OPTIONS / HTTP/1.1\r\n" +
"Host: " + host + "\r\n" +
"Connection: Upgrade, HTTP2-Settings\r\n" +
"Upgrade: h2c\r\n" +
"HTTP2-Settings: " + upgrade.Base64EncodedSettings + "\r\n\r\n";
logger.LogInformation("Sending upgrade request:\n" + upgradeHeader);
var encodedHeader = Encoding.ASCII.GetBytes(upgradeHeader);
await wrappedStreams.WriteableStream.WriteAsync(
new ArraySegment <byte>(encodedHeader));
// Wait for the upgrade response
await upgradeReadStream.WaitForHttpHeader();
var headerBytes = upgradeReadStream.HeaderBytes;
logger.LogInformation(
"Received HTTP/1.1 response: " +
Encoding.ASCII.GetString(headerBytes.Array, 0, headerBytes.Count));
// Try to parse the upgrade response as HTTP/1 status and check whether
// the upgrade was successful.
var response = Http1Response.ParseFrom(
Encoding.ASCII.GetString(
headerBytes.Array, headerBytes.Offset, headerBytes.Count - 4));
// Mark the HTTP/1.1 bytes as read
upgradeReadStream.ConsumeHttpHeader();
if (response.StatusCode != "101")
{
throw new Exception("Upgrade failed");
}
if (!response.Headers.Any(hf => hf.Key == "connection" && hf.Value == "Upgrade") ||
!response.Headers.Any(hf => hf.Key == "upgrade" && hf.Value == "h2c"))
{
throw new Exception("Upgrade failed");
}
logger.LogInformation("Connection upgrade succesful!");
// If we get here then the connection will be reponsible for closing
// the stream
needExplicitStreamClose = false;
// Build a HTTP connection on top of the stream abstraction
var connLogger = verbose ? logProvider.CreateLogger("HTTP2Conn") : null;
var conn = new Connection(
config, upgradeReadStream, wrappedStreams.WriteableStream,
options: new Connection.Options
{
Logger = connLogger,
ClientUpgradeRequest = upgrade,
});
// Retrieve the response stream for the connection upgrade.
var upgradeStream = await upgrade.UpgradeRequestStream;
// As we made the upgrade via a dummy OPTIONS request we are not
// really interested in the result of the upgrade request
upgradeStream.Cancel();
return(conn);
}
finally
{
if (needExplicitStreamClose)
{
await wrappedStreams.WriteableStream.CloseAsync();
}
}
}
/// <summary>
/// Http2Client
/// </summary>
/// <param name="host"></param>
/// <param name="ip"></param>
/// <param name="scheme"></param>
/// <param name="path"></param>
/// <param name="authority"></param>
/// <param name="useHttp1Upgrade"></param>
/// <param name="size"></param>
/// <param name="timeOut"></param>
public Http2Client(string host, int ip, string scheme, string path, string authority, bool useHttp1Upgrade = false, int size = 1024, int timeOut = 180 * 1000)
{
_path = path;
_authority = authority;
var options = SocketOptionBuilder.Instance.SetSocket(Sockets.Model.SAEASocketType.Tcp)
.UseStream()
.SetIP(host)
.SetPort(ip)
.SetReadBufferSize(size)
.SetWriteBufferSize(size)
.SetTimeOut(timeOut)
.Build();
_clientSocket = SocketFactory.CreateClientSocket(options);
_clientSocket.ConnectAsync().GetAwaiter();
var config = new ConnectionConfigurationBuilder(false)
.UseSettings(Settings.Default)
.UseHuffmanStrategy(HuffmanStrategy.IfSmaller)
.Build();
var wrappedStreams = _clientSocket.Socket.CreateStreams();
if (useHttp1Upgrade)
{
var upgrade = new ClientUpgradeRequestBuilder()
.SetHttp2Settings(config.Settings)
.Build();
var upgradeReadStream = new UpgradeReadStream(wrappedStreams.ReadableStream);
var needExplicitStreamClose = true;
try
{
var upgradeHeader = "OPTIONS / HTTP/1.1\r\n" +
"Host: " + host + "\r\n" +
"Connection: Upgrade, HTTP2-Settings\r\n" +
"Upgrade: h2c\r\n" +
"HTTP2-Settings: " + upgrade.Base64EncodedSettings + "\r\n\r\n";
var encodedHeader = Encoding.ASCII.GetBytes(upgradeHeader);
wrappedStreams.WriteableStream.WriteAsync(new ArraySegment <byte>(encodedHeader)).GetAwaiter();
upgradeReadStream.WaitForHttpHeader().GetAwaiter();
var headerBytes = upgradeReadStream.HeaderBytes;
upgradeReadStream.ConsumeHttpHeader();
var response = Http1Response.ParseFrom(Encoding.ASCII.GetString(headerBytes.Array, headerBytes.Offset, headerBytes.Count - 4));
if (response.StatusCode != "101")
{
throw new Exception("升级失败");
}
if (!response.Headers.Any(hf => hf.Key == "connection" && hf.Value == "Upgrade") ||
!response.Headers.Any(hf => hf.Key == "upgrade" && hf.Value == "h2c"))
{
throw new Exception("升级失败");
}
needExplicitStreamClose = false;
var conn = new Connection(config, upgradeReadStream, wrappedStreams.WriteableStream, options: new Connection.Options
{
ClientUpgradeRequest = upgrade,
});
var upgradeStream = upgrade.UpgradeRequestStream.GetAwaiter().GetResult();
upgradeStream.Cancel();
_conn = conn;
}
finally
{
if (needExplicitStreamClose)
{
wrappedStreams.WriteableStream.CloseAsync();
}
}
}
else
{
_conn = new Connection(config, wrappedStreams.ReadableStream, wrappedStreams.WriteableStream, options: new Connection.Options());
}
}
