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JsonHandler.cs
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JsonHandler.cs
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using System;
using System.IO;
using System.Threading.Tasks;
using System.Text.Json;
using Npgsql.BackendMessages;
using Npgsql.PostgresTypes;
using Npgsql.TypeHandling;
using Npgsql.TypeMapping;
using NpgsqlTypes;
#pragma warning disable CS1591 // Missing XML comment for publicly visible type or member
namespace Npgsql.TypeHandlers
{
[TypeMapping("jsonb", NpgsqlDbType.Jsonb, typeof(JsonDocument))]
public class JsonbHandlerFactory : NpgsqlTypeHandlerFactory<string>
{
readonly JsonSerializerOptions? _serializerOptions;
public JsonbHandlerFactory() => _serializerOptions = null;
public JsonbHandlerFactory(JsonSerializerOptions serializerOptions)
=> _serializerOptions = serializerOptions;
public override NpgsqlTypeHandler<string> Create(PostgresType postgresType, NpgsqlConnection conn)
=> new JsonHandler(postgresType, conn, isJsonb: true, _serializerOptions);
}
[TypeMapping("json", NpgsqlDbType.Json)]
public class JsonHandlerFactory : NpgsqlTypeHandlerFactory<string>
{
readonly JsonSerializerOptions? _serializerOptions;
public JsonHandlerFactory() => _serializerOptions = null;
public JsonHandlerFactory(JsonSerializerOptions serializerOptions)
=> _serializerOptions = serializerOptions;
public override NpgsqlTypeHandler<string> Create(PostgresType postgresType, NpgsqlConnection conn)
=> new JsonHandler(postgresType, conn, isJsonb: false, _serializerOptions);
}
public class JsonHandler : NpgsqlTypeHandler<string>, ITextReaderHandler
{
readonly JsonSerializerOptions _serializerOptions;
readonly TextHandler _textHandler;
readonly bool _isJsonb;
readonly int _headerLen;
/// <summary>
/// Prepended to the string in the wire encoding
/// </summary>
const byte JsonbProtocolVersion = 1;
static readonly JsonSerializerOptions DefaultSerializerOptions = new JsonSerializerOptions();
protected internal JsonHandler(PostgresType postgresType, NpgsqlConnection connection, bool isJsonb, JsonSerializerOptions? serializerOptions = null)
: base(postgresType)
{
_serializerOptions = serializerOptions ?? DefaultSerializerOptions;
_isJsonb = isJsonb;
_headerLen = isJsonb ? 1 : 0;
_textHandler = new TextHandler(postgresType, connection);
}
protected internal override int ValidateAndGetLength<TAny>(TAny value, ref NpgsqlLengthCache? lengthCache, NpgsqlParameter? parameter)
{
if (typeof(TAny) == typeof(string) ||
typeof(TAny) == typeof(char[]) ||
typeof(TAny) == typeof(ArraySegment<char>) ||
typeof(TAny) == typeof(char) ||
typeof(TAny) == typeof(byte[]))
{
return _textHandler.ValidateAndGetLength(value, ref lengthCache, parameter) + _headerLen;
}
if (typeof(TAny) == typeof(JsonDocument))
{
if (lengthCache == null)
lengthCache = new NpgsqlLengthCache(1);
if (lengthCache.IsPopulated)
return lengthCache.Get();
var data = SerializeJsonDocument((JsonDocument)(object)value!);
if (parameter != null)
parameter.ConvertedValue = data;
return lengthCache.Set(data.Length + _headerLen);
}
// User POCO, need to serialize. At least internally ArrayPool buffers are used...
var s = JsonSerializer.Serialize(value, _serializerOptions);
if (parameter != null)
parameter.ConvertedValue = s;
return _textHandler.ValidateAndGetLength(s, ref lengthCache, parameter) + _headerLen;
}
protected override async Task WriteWithLength<TAny>(TAny value, NpgsqlWriteBuffer buf, NpgsqlLengthCache? lengthCache, NpgsqlParameter? parameter, bool async)
{
buf.WriteInt32(ValidateAndGetLength(value, ref lengthCache, parameter));
if (_isJsonb)
{
if (buf.WriteSpaceLeft < 1)
await buf.Flush(async);
buf.WriteByte(JsonbProtocolVersion);
}
if (typeof(TAny) == typeof(string))
await _textHandler.Write((string)(object)value!, buf, lengthCache, parameter, async);
else if (typeof(TAny) == typeof(char[]))
await _textHandler.Write((char[])(object)value!, buf, lengthCache, parameter, async);
else if (typeof(TAny) == typeof(ArraySegment<char>))
await _textHandler.Write((ArraySegment<char>)(object)value!, buf, lengthCache, parameter, async);
else if (typeof(TAny) == typeof(char))
await _textHandler.Write((char)(object)value!, buf, lengthCache, parameter, async);
else if (typeof(TAny) == typeof(byte[]))
await _textHandler.Write((byte[])(object)value!, buf, lengthCache, parameter, async);
else if (typeof(TAny) == typeof(JsonDocument))
{
var data = parameter?.ConvertedValue != null
? (byte[])parameter.ConvertedValue
: SerializeJsonDocument((JsonDocument)(object)value!);
await buf.WriteBytesRaw(data, async);
}
else
{
// User POCO, read serialized representation from the validation phase
var s = parameter?.ConvertedValue != null
? (string)parameter.ConvertedValue
: JsonSerializer.Serialize(value!, value!.GetType(), _serializerOptions);
await _textHandler.Write(s, buf, lengthCache, parameter, async);
}
}
public override int ValidateAndGetLength(string value, ref NpgsqlLengthCache? lengthCache, NpgsqlParameter? parameter)
=> ValidateAndGetLength<string>(value, ref lengthCache, parameter);
public override async Task Write(string value, NpgsqlWriteBuffer buf, NpgsqlLengthCache? lengthCache, NpgsqlParameter? parameter, bool async)
{
if (_isJsonb)
{
if (buf.WriteSpaceLeft < 1)
await buf.Flush(async);
buf.WriteByte(JsonbProtocolVersion);
}
await _textHandler.Write(value, buf, lengthCache, parameter, async);
}
protected internal override int ValidateObjectAndGetLength(object value, ref NpgsqlLengthCache? lengthCache, NpgsqlParameter? parameter)
=> value switch
{
DBNull _ => base.ValidateObjectAndGetLength(value, ref lengthCache, parameter),
string s => ValidateAndGetLength(s, ref lengthCache, parameter),
char[] s => ValidateAndGetLength(s, ref lengthCache, parameter),
ArraySegment<char> s => ValidateAndGetLength(s, ref lengthCache, parameter),
char s => ValidateAndGetLength(s, ref lengthCache, parameter),
byte[] s => ValidateAndGetLength(s, ref lengthCache, parameter),
JsonDocument jsonDocument => ValidateAndGetLength(jsonDocument, ref lengthCache, parameter),
_ => ValidateAndGetLength(value, ref lengthCache, parameter)
};
protected internal override async Task WriteObjectWithLength(object value, NpgsqlWriteBuffer buf, NpgsqlLengthCache? lengthCache, NpgsqlParameter? parameter, bool async)
{
// We call into WriteWithLength<T> below, which assumes it as at least enough write space for the length
if (buf.WriteSpaceLeft < 4)
await buf.Flush(async);
await (value switch
{
DBNull _ => base.WriteObjectWithLength(value, buf, lengthCache, parameter, async),
string s => WriteWithLength(s, buf, lengthCache, parameter, async),
char[] s => WriteWithLength(s, buf, lengthCache, parameter, async),
ArraySegment<char> s => WriteWithLength(s, buf, lengthCache, parameter, async),
char s => WriteWithLength(s, buf, lengthCache, parameter, async),
byte[] s => WriteWithLength(s, buf, lengthCache, parameter, async),
JsonDocument jsonDocument => WriteWithLength(jsonDocument, buf, lengthCache, parameter, async),
_ => WriteWithLength(value, buf, lengthCache, parameter, async),
});
}
protected internal override async ValueTask<T> Read<T>(NpgsqlReadBuffer buf, int byteLen, bool async, FieldDescription? fieldDescription = null)
{
if (_isJsonb)
{
await buf.Ensure(1, async);
var version = buf.ReadByte();
if (version != JsonbProtocolVersion)
throw new NotSupportedException($"Don't know how to decode JSONB with wire format {version}, your connection is now broken");
byteLen--;
}
if (typeof(T) == typeof(string) ||
typeof(T) == typeof(char[]) ||
typeof(T) == typeof(ArraySegment<char>) ||
typeof(T) == typeof(char) ||
typeof(T) == typeof(byte[]))
{
return await _textHandler.Read<T>(buf, byteLen, async, fieldDescription);
}
try
{
// Unless we're in SequentialAccess mode, the entire value is already buffered in memory -
// deserialize it directly from bytes. Otherwise deserialize to string first - we can optimize this
// later.
if (buf.ReadBytesLeft >= byteLen)
{
return typeof(T) == typeof(JsonDocument)
? (T)(object)JsonDocument.Parse(buf.ReadMemory(byteLen))
: JsonSerializer.Deserialize<T>(buf.ReadSpan(byteLen), _serializerOptions);
}
var s = await _textHandler.Read(buf, byteLen, async, fieldDescription);
return typeof(T) == typeof(JsonDocument)
? (T)(object)JsonDocument.Parse(s)
: JsonSerializer.Deserialize<T>(s, _serializerOptions);
}
catch (Exception e)
{
throw new NpgsqlSafeReadException(e);
}
}
public override ValueTask<string> Read(NpgsqlReadBuffer buf, int len, bool async, FieldDescription? fieldDescription = null)
=> Read<string>(buf, len, async, fieldDescription);
public TextReader GetTextReader(Stream stream)
{
if (_isJsonb)
{
var version = stream.ReadByte();
if (version != JsonbProtocolVersion)
throw new NpgsqlException($"Don't know how to decode jsonb with wire format {version}, your connection is now broken");
}
return _textHandler.GetTextReader(stream);
}
byte[] SerializeJsonDocument(JsonDocument document)
{
// TODO: Writing is currently really inefficient - please don't criticize :)
// We need to implement one-pass writing to serialize directly to the buffer (or just switch to pipelines).
using var stream = new MemoryStream();
using var writer = new Utf8JsonWriter(stream);
document.WriteTo(writer);
writer.Flush();
return stream.ToArray();
}
}
}