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JsonHandler.cs
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78 lines (66 loc) · 3.28 KB
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using System;
using System.Threading.Tasks;
using Newtonsoft.Json;
using Npgsql.BackendMessages;
using Npgsql.PostgresTypes;
using Npgsql.TypeHandling;
#pragma warning disable CS1591 // Missing XML comment for publicly visible type or member
namespace Npgsql.Json.NET
{
public class JsonHandlerFactory : NpgsqlTypeHandlerFactory<string>
{
readonly JsonSerializerSettings _settings;
public JsonHandlerFactory(JsonSerializerSettings? settings = null)
=> _settings = settings ?? new JsonSerializerSettings();
public override NpgsqlTypeHandler<string> Create(PostgresType postgresType, NpgsqlConnection conn)
=> new JsonHandler(postgresType, conn, _settings);
}
class JsonHandler : TypeHandlers.TextHandler
{
readonly JsonSerializerSettings _settings;
public JsonHandler(PostgresType postgresType, NpgsqlConnection connection, JsonSerializerSettings settings)
: base(postgresType, connection) => _settings = settings;
protected override async ValueTask<T> Read<T>(NpgsqlReadBuffer buf, int len, bool async, FieldDescription? fieldDescription = null)
{
var s = await base.Read<string>(buf, len, async, fieldDescription);
if (typeof(T) == typeof(string))
return (T)(object)s;
try
{
return JsonConvert.DeserializeObject<T>(s, _settings);
}
catch (Exception e)
{
throw new NpgsqlSafeReadException(e);
}
}
protected override int ValidateAndGetLength<T2>(T2 value, ref NpgsqlLengthCache? lengthCache, NpgsqlParameter? parameter)
=> typeof(T2) == typeof(string)
? base.ValidateAndGetLength(value, ref lengthCache, parameter)
: ValidateObjectAndGetLength(value!, ref lengthCache, parameter);
protected override Task WriteWithLength<T2>(T2 value, NpgsqlWriteBuffer buf, NpgsqlLengthCache? lengthCache, NpgsqlParameter? parameter, bool async)
=> typeof(T2) == typeof(string)
? base.WriteWithLength(value, buf, lengthCache, parameter, async)
: WriteObjectWithLength(value!, buf, lengthCache, parameter, async);
protected override int ValidateObjectAndGetLength(object value, ref NpgsqlLengthCache? lengthCache, NpgsqlParameter? parameter)
{
var s = value as string;
if (s == null)
{
s = JsonConvert.SerializeObject(value, _settings);
if (parameter != null)
parameter.ConvertedValue = s;
}
return base.ValidateAndGetLength(s, ref lengthCache, parameter);
}
protected override Task WriteObjectWithLength(object value, NpgsqlWriteBuffer buf, NpgsqlLengthCache? lengthCache, NpgsqlParameter? parameter, bool async)
{
if (value is DBNull)
return base.WriteObjectWithLength(DBNull.Value, buf, lengthCache, parameter, async);
if (parameter?.ConvertedValue != null)
value = parameter.ConvertedValue;
var s = value as string ?? JsonConvert.SerializeObject(value, _settings);
return base.WriteObjectWithLength(s, buf, lengthCache, parameter, async);
}
}
}