private Dictionary<string, string> ReadHeaders(ref Utf8JsonReader reader)
{
var headers = new Dictionary<string, string>(StringComparer.Ordinal);
if (reader.TokenType != JsonTokenType.StartObject)
{
throw new InvalidDataException($"Expected '{HeadersPropertyName}' to be of type {JsonTokenType.StartObject}.");
}
while (reader.Read())
{
switch (reader.TokenType)
{
case JsonTokenType.PropertyName:
var propertyName = reader.GetString();
reader.CheckRead();
if (reader.TokenType != JsonTokenType.String)
{
throw new InvalidDataException($"Expected header '{propertyName}' to be of type {JsonTokenType.String}.");
}
headers[propertyName] = reader.GetString();
break;
case JsonTokenType.Comment:
break;
case JsonTokenType.EndObject:
return headers;
}
}
throw new InvalidDataException("Unexpected end when reading message headers");
}
private object?[] BindTypes(ref Utf8JsonReader reader, IReadOnlyList <Type> paramTypes)
{
object?[]? arguments = null;
var paramIndex = 0;
var paramCount = paramTypes.Count;
var depth = reader.CurrentDepth;
reader.CheckRead();
while (reader.TokenType != JsonTokenType.EndArray && reader.CurrentDepth > depth)
{
if (paramIndex < paramCount)
{
arguments ??= new object?[paramCount];
try
{
arguments[paramIndex] = BindType(ref reader, paramTypes[paramIndex]);
}
catch (Exception ex)
{
throw new InvalidDataException("Error binding arguments. Make sure that the types of the provided values match the types of the hub method being invoked.", ex);
}
}
else
{
// Skip extra arguments and throw error after reading them all
reader.Skip();
}
reader.CheckRead();
paramIndex++;
}
if (paramIndex != paramCount)
{
throw new InvalidDataException($"Invocation provides {paramIndex} argument(s) but target expects {paramCount}.");
}
return(arguments ?? Array.Empty <object>());
}
private static AvailableTransport ParseAvailableTransport(ref Utf8JsonReader reader)
{
var availableTransport = new AvailableTransport();
while (reader.CheckRead())
{
switch (reader.TokenType)
{
case JsonTokenType.PropertyName:
var memberName = reader.ValueSpan;
if (memberName.SequenceEqual(TransportPropertyNameBytes))
{
availableTransport.Transport = reader.ReadAsString(TransportPropertyNameBytes);
}
else if (memberName.SequenceEqual(TransferFormatsPropertyNameBytes))
{
reader.CheckRead();
reader.EnsureArrayStart();
var completed = false;
availableTransport.TransferFormats = new List <string>();
while (!completed && reader.CheckRead())
{
switch (reader.TokenType)
{
case JsonTokenType.String:
availableTransport.TransferFormats.Add(reader.GetString());
break;
case JsonTokenType.EndArray:
completed = true;
break;
default:
throw new InvalidDataException($"Unexpected token '{reader.TokenType}' when reading transfer formats JSON.");
}
}
}
else
{
reader.Skip();
}
break;
case JsonTokenType.EndObject:
if (availableTransport.Transport == null)
{
throw new InvalidDataException($"Missing required property '{TransportPropertyName}'.");
}
if (availableTransport.TransferFormats == null)
{
throw new InvalidDataException($"Missing required property '{TransferFormatsPropertyName}'.");
}
return(availableTransport);
default:
throw new InvalidDataException($"Unexpected token '{reader.TokenType}' when reading available transport JSON.");
}
}
throw new InvalidDataException("Unexpected end when reading JSON.");
}