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CompactJsonFormatter.cs
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CompactJsonFormatter.cs
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// Copyright 2016 Serilog Contributors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
using System;
using System.Globalization;
using System.IO;
using System.Linq;
using Serilog.Events;
using Serilog.Formatting.Json;
using Serilog.Parsing;
// ReSharper disable MemberCanBePrivate.Global
namespace Serilog.Formatting.Compact
{
/// <summary>
/// An <see cref="ITextFormatter"/> that writes events in a compact JSON format.
/// </summary>
public class CompactJsonFormatter: ITextFormatter
{
readonly JsonValueFormatter _valueFormatter;
/// <summary>
/// Construct a <see cref="CompactJsonFormatter"/>, optionally supplying a formatter for
/// <see cref="LogEventPropertyValue"/>s on the event.
/// </summary>
/// <param name="valueFormatter">A value formatter, or null.</param>
public CompactJsonFormatter(JsonValueFormatter valueFormatter = null)
{
_valueFormatter = valueFormatter ?? new JsonValueFormatter(typeTagName: "$type");
}
/// <summary>
/// Format the log event into the output. Subsequent events will be newline-delimited.
/// </summary>
/// <param name="logEvent">The event to format.</param>
/// <param name="output">The output.</param>
public void Format(LogEvent logEvent, TextWriter output)
{
FormatEvent(logEvent, output, _valueFormatter);
output.WriteLine();
}
/// <summary>
/// Format the log event into the output.
/// </summary>
/// <param name="logEvent">The event to format.</param>
/// <param name="output">The output.</param>
/// <param name="valueFormatter">A value formatter for <see cref="LogEventPropertyValue"/>s on the event.</param>
public static void FormatEvent(LogEvent logEvent, TextWriter output, JsonValueFormatter valueFormatter)
{
if (logEvent == null) throw new ArgumentNullException(nameof(logEvent));
if (output == null) throw new ArgumentNullException(nameof(output));
if (valueFormatter == null) throw new ArgumentNullException(nameof(valueFormatter));
output.Write("{\"@t\":\"");
output.Write(logEvent.Timestamp.UtcDateTime.ToString("O"));
output.Write("\",\"@mt\":");
JsonValueFormatter.WriteQuotedJsonString(logEvent.MessageTemplate.Text, output);
var tokensWithFormat = logEvent.MessageTemplate.Tokens
.OfType<PropertyToken>()
.Where(pt => pt.Format != null);
// Better not to allocate an array in the 99.9% of cases where this is false
// ReSharper disable once PossibleMultipleEnumeration
if (tokensWithFormat.Any())
{
output.Write(",\"@r\":[");
var delim = "";
foreach (PropertyToken r in tokensWithFormat)
{
output.Write(delim);
delim = ",";
var space = new StringWriter();
r.Render(logEvent.Properties, space, CultureInfo.InvariantCulture);
JsonValueFormatter.WriteQuotedJsonString(space.ToString(), output);
}
output.Write(']');
}
if (logEvent.Level != LogEventLevel.Information)
{
output.Write(",\"@l\":\"");
output.Write(logEvent.Level);
output.Write('\"');
}
if (logEvent.Exception != null)
{
output.Write(",\"@x\":");
JsonValueFormatter.WriteQuotedJsonString(logEvent.Exception.ToString(), output);
}
if (logEvent.TraceId != null)
{
output.Write(",\"@tr\":\"");
output.Write(logEvent.TraceId.Value.ToHexString());
output.Write('\"');
}
if (logEvent.SpanId != null)
{
output.Write(",\"@sp\":\"");
output.Write(logEvent.SpanId.Value.ToHexString());
output.Write('\"');
}
foreach (var property in logEvent.Properties)
{
var name = property.Key;
if (name.Length > 0 && name[0] == '@')
{
// Escape first '@' by doubling
name = '@' + name;
}
output.Write(',');
JsonValueFormatter.WriteQuotedJsonString(name, output);
output.Write(':');
valueFormatter.Format(property.Value, output);
}
output.Write('}');
}
}
}