public async Task <byte[]> SerializeAsync(T data, SerializationContext context)
{
var json = JsonSerializer.Serialize(data, new JsonSerializerOptions // TODO: Make this configurable
{
PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
});
var subjectName = $"{context.Topic}-{context.Component.ToString().ToLower()}";
var subjectVersions = await _schemaRegistryClient.ListSchemaVersionsAsync(subjectName, CancellationToken.None);
if (subjectVersions != null && subjectVersions.Any())
{
var version = subjectVersions.Last();
var schemaDetails = await _schemaRegistryClient.GetSchemaAsync(subjectName, version, CancellationToken.None);
if (!schemaDetails.SchemaType.Equals("JSON", StringComparison.InvariantCultureIgnoreCase))
{
throw new KafkaSerializationException($"Unable to verify schema for subject {subjectName}, version {version}, " +
$"as the schema is {schemaDetails.SchemaType} but expected JSON");
}
var schema = await JsonSchema.FromJsonAsync(schemaDetails.Schema);
var validationErrors = schema.Validate(json);
if (validationErrors.Any())
{
var validationErrorStrings = validationErrors.Select(err =>
err.ToString()).ToArray();
throw new KafkaJsonSchemaSerializationException(validationErrorStrings);
}
}
return(Encoding.UTF8.GetBytes(json));
}
