public static async Task SendMessageAsync(
this IWebSocketContext context,
OperationMessage message,
CancellationToken cancellationToken)
{
using (Stream messageStream = message.CreateMessageStream())
{
await context.SendMessageAsync(
messageStream,
cancellationToken);
}
}
public static byte[] Serialize(
this OperationMessage message)
{
if (message is KeepConnectionAliveMessage)
{
return(_keepConnectionAliveMessage);
}
if (message is AcceptConnectionMessage)
{
return(_acceptConnectionMessage);
}
return(SerializeInternal(message));
}
private static bool TryDeserializeDataStartMessage(
GraphQLSocketMessage parsedMessage,
out OperationMessage message)
{
if (!parsedMessage.HasPayload)
{
message = null;
return(false);
}
IReadOnlyList <GraphQLRequest> batch =
Utf8GraphQLRequestParser.Parse(parsedMessage.Payload);
message = new DataStartMessage(parsedMessage.Id, batch[0]);
return(true);
}
private async Task HandleMessageAsync(
ISocketConnection connection,
OperationMessage message,
CancellationToken cancellationToken)
{
for (int i = 0; i < _messageHandlers.Length; i++)
{
IMessageHandler handler = _messageHandlers[i];
if (handler.CanHandle(message))
{
await handler.HandleAsync(connection, message, cancellationToken);
// the message is handled and we are done.
return;
}
}
throw new NotSupportedException("The specified message type is not supported.");
}
private static Stream CreateMessageStream(
this OperationMessage message,
bool largeMessage)
{
if (message is DataStartMessage dataStart)
{
string query = QuerySyntaxSerializer.Serialize(
dataStart.Payload.Query);
var payload = new Dictionary <string, object>
{
{ "query", query },
};
if (dataStart.Payload.QueryName != null)
{
payload["namedQuery"] = dataStart.Payload.QueryName;
}
if (dataStart.Payload.OperationName != null)
{
payload["operationName"] = dataStart.Payload.OperationName;
}
if (dataStart.Payload.Variables != null)
{
payload["variables"] = dataStart.Payload.Variables;
}
message = new HelperOperationMessage(
dataStart.Type, dataStart.Id, payload);
}
string json = JsonConvert.SerializeObject(message, _settings);
if (largeMessage)
{
json += new string(' ', 1024 * 16);
}
return(new MemoryStream(Encoding.UTF8.GetBytes(json)));
}
public static async Task SendMessageAsync(
this WebSocket webSocket,
OperationMessage message,
bool largeMessage = false)
{
var buffer = new byte[_maxMessageSize];
await using Stream stream = message.CreateMessageStream(largeMessage);
int read;
do
{
read = stream.Read(buffer, 0, buffer.Length);
var segment = new ArraySegment <byte>(buffer, 0, read);
var isEndOfMessage = stream.Position == stream.Length;
await webSocket.SendAsync(
segment, WebSocketMessageType.Text,
isEndOfMessage, CancellationToken.None);
} while (read == _maxMessageSize);
}
public static async Task SendMessageAsync(
this IWebSocketContext context,
OperationMessage message,
CancellationToken cancellationToken)
{
var buffer = new byte[_maxMessageSize];
using (Stream stream = message.CreateMessageStream())
{
int read = 0;
do
{
read = stream.Read(buffer, 0, buffer.Length);
var segment = new ArraySegment <byte>(buffer, 0, read);
bool isEndOfMessage = stream.Position == stream.Length;
await context.WebSocket.SendAsync(
segment, WebSocketMessageType.Text,
isEndOfMessage, cancellationToken);
} while (read == _maxMessageSize);
}
}
private static Stream CreateMessageStream(this OperationMessage message)
{
string json = JsonConvert.SerializeObject(message, _settings);
return(new MemoryStream(Encoding.UTF8.GetBytes(json)));
}
private static bool TryParseMessage(
ReadOnlySequence <byte> slice,
out OperationMessage message)
{
ReadOnlySpan <byte> messageData;
byte[] buffer = null;
if (slice.IsSingleSegment)
{
messageData = slice.First.Span;
}
else
{
buffer = ArrayPool <byte> .Shared.Rent(1024 * 4);
int buffered = 0;
SequencePosition position = slice.Start;
ReadOnlyMemory <byte> memory;
while (slice.TryGet(ref position, out memory, true))
{
ReadOnlySpan <byte> span = memory.Span;
var bytesRemaining = buffer.Length - buffered;
if (span.Length > bytesRemaining)
{
var next = ArrayPool <byte> .Shared.Rent(
buffer.Length * 2);
Buffer.BlockCopy(buffer, 0, next, 0, buffer.Length);
ArrayPool <byte> .Shared.Return(buffer);
buffer = next;
}
for (int i = 0; i < span.Length; i++)
{
buffer[buffered++] = span[i];
}
}
messageData = buffer;
messageData = messageData.Slice(0, buffered);
}
try
{
if (messageData.Length == 0 ||
(messageData.Length == 1 && messageData[0] == default))
{
message = null;
return(false);
}
GraphQLSocketMessage parsedMessage =
Utf8GraphQLRequestParser.ParseMessage(messageData);
return(TryDeserializeMessage(parsedMessage, out message));
}
catch (SyntaxException)
{
message = null;
return(false);
}
finally
{
if (buffer != null)
{
ArrayPool <byte> .Shared.Return(buffer);
}
}
}
public static Task SendAsync(
this ISocketConnection connection,
OperationMessage message,
CancellationToken cancellationToken) =>
connection.SendAsync(message.Serialize(), cancellationToken);
private static byte[] SerializeInternal(OperationMessage message)
{
return(Encoding.GetBytes(
JsonConvert.SerializeObject(message, JsonSettings)));
}