public override TMessage?Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
{
using var d = JsonDocument.ParseValue(ref reader);
if (!d.RootElement.TryGetProperty(AnyTypeUrlField, out var urlField))
{
throw new InvalidOperationException("Any message with no @type");
}
var message = new TMessage();
var typeUrl = urlField.GetString();
var typeName = Any.GetTypeName(typeUrl);
var descriptor = _settings.TypeRegistry.Find(typeName);
if (descriptor == null)
{
throw new InvalidOperationException($"Type registry has no descriptor for type name '{typeName}'");
}
IMessage data;
if (JsonConverterHelper.IsWellKnownType(descriptor))
{
if (!d.RootElement.TryGetProperty(AnyWellKnownTypeValueField, out var valueField))
{
throw new InvalidOperationException($"Expected '{AnyWellKnownTypeValueField}' property for well-known type Any body");
}
data = (IMessage)JsonSerializer.Deserialize(valueField, descriptor.ClrType, options) !;
}
else
{
data = (IMessage)JsonSerializer.Deserialize(d.RootElement, descriptor.ClrType, options) !;
}
message.Descriptor.Fields[Any.TypeUrlFieldNumber].Accessor.SetValue(message, typeUrl);
message.Descriptor.Fields[Any.ValueFieldNumber].Accessor.SetValue(message, data.ToByteString());
return(message);
}
public override void Write(Utf8JsonWriter writer, TMessage value, JsonSerializerOptions options)
{
var typeUrl = (string)value.Descriptor.Fields[Any.TypeUrlFieldNumber].Accessor.GetValue(value);
var data = (ByteString)value.Descriptor.Fields[Any.ValueFieldNumber].Accessor.GetValue(value);
var typeName = Any.GetTypeName(typeUrl);
var descriptor = _settings.TypeRegistry.Find(typeName);
if (descriptor == null)
{
throw new InvalidOperationException($"Type registry has no descriptor for type name '{typeName}'");
}
var valueMessage = descriptor.Parser.ParseFrom(data);
writer.WriteStartObject();
writer.WriteString(AnyTypeUrlField, typeUrl);
if (JsonConverterHelper.IsWellKnownType(descriptor))
{
writer.WritePropertyName(AnyWellKnownTypeValueField);
if (JsonConverterHelper.IsWrapperType(descriptor))
{
var wrappedValue = valueMessage.Descriptor.Fields[JsonConverterHelper.WrapperValueFieldNumber].Accessor.GetValue(valueMessage);
JsonSerializer.Serialize(writer, wrappedValue, wrappedValue.GetType(), options);
}
else
{
JsonSerializer.Serialize(writer, valueMessage, valueMessage.GetType(), options);
}
}
else
{
MessageConverter <Any> .WriteMessageFields(writer, valueMessage, _settings, options);
}
writer.WriteEndObject();
}