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KafkaJsonSerializer.cs
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KafkaJsonSerializer.cs
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//------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//------------------------------------------------------------
namespace Microsoft.Azure.Kafka.SchemaRegistry.Json
{
using System;
using System.IO;
using System.Threading;
using System.Text;
using global::Azure.Core;
using global::Azure.Data.SchemaRegistry;
using Confluent.Kafka;
using Newtonsoft.Json;
using Newtonsoft.Json.Schema;
using System.Collections.Generic;
using Newtonsoft.Json.Linq;
/// <summary>
/// Sample implementation of Kafka Json serializer, wrapping Azure Schema Registry C# implementation.
///
/// This is meant for reference and sample purposes only, do not use this for production.
/// </summary>
/// <typeparam name="T"></typeparam>
public class KafkaJsonSerializer<T> : ISerializer<T>
{
readonly JsonSchemaGenerator schemaGenerator;
readonly SchemaRegistryClient schemaRegistryClient;
readonly bool autoRegisterSchemas;
readonly string schemaGroup;
public KafkaJsonSerializer(string schemaRegistryUrl, TokenCredential credential, string schemaGroup, bool autoRegisterSchemas = false)
{
this.schemaRegistryClient = new SchemaRegistryClient(schemaRegistryUrl, credential, new SchemaRegistryClientOptions
{
Diagnostics =
{
ApplicationId = "net-json-kafka-ser-1.0"
}
});
this.autoRegisterSchemas = autoRegisterSchemas;
this.schemaGroup = schemaGroup;
this.schemaGenerator = new JsonSchemaGenerator();
}
public byte[] Serialize(T o, SerializationContext context)
{
if (o == null)
{
return null;
}
// This implementation is actually based on the old Newtonsoft Json implementation which
// uses a older json-schema draft version.
// When we updated to use the latest Newtonsoft package/draft, this implementation will
// need to change using the new classes.
var schema = schemaGenerator.Generate(typeof(T));
var jObject = JObject.FromObject(o);
if (!jObject.IsValid(schema))
{
throw new SerializationException(new Error(ErrorCode.Local_ValueSerialization, $"Unexpected parsing error when generating scheam from instance."));
}
var schemaJson = schema.ToString();
SchemaProperties schemaProperties;
if (this.autoRegisterSchemas)
{
schemaProperties = this.schemaRegistryClient.RegisterSchema(
this.schemaGroup,
typeof(T).FullName,
schemaJson,
SchemaFormat.Json).Value;
}
else
{
schemaProperties = this.schemaRegistryClient.GetSchemaProperties(
this.schemaGroup,
typeof(T).FullName,
schemaJson,
SchemaFormat.Json).Value;
}
if (schemaProperties == null)
{
throw new SerializationException(new Error(ErrorCode.Local_ValueSerialization, "Schema registry client returned null response"));
}
else if (schemaProperties.Format != SchemaFormat.Json)
{
throw new SerializationException(new Error(ErrorCode.Local_ValueSerialization, $"Schema registered was not json type, it was {schemaProperties.Format}"));
}
context.Headers.Add("schemaId", UTF8Encoding.UTF8.GetBytes(schemaProperties.Id));
var json = jObject.ToString();
return UTF8Encoding.UTF8.GetBytes(json);
}
}
}