Added useCompactFormat flag to support posting events using Serilog.Formatting.Compact

sample/Sample/Program.cs

@@ -30,6 +30,8 @@ public static void Main(string[] args)
  Thread.Sleep(1000);
  Log.Debug("Loop iteration done");
  }
+
+ Log.CloseAndFlush();
  }
  }
 }

src/Serilog.Sinks.Seq/SeqLoggerConfigurationExtensions.cs

@@ -51,6 +51,9 @@ public static class SeqLoggerConfigurationExtensions
  /// <param name="retainedInvalidPayloadsLimitBytes">A soft limit for the number of bytes to use for storing failed requests. 
  /// The limit is soft in that it can be exceeded by any single error payload, but in that case only that single error
  /// payload will be retained.</param>
+ /// <param name="useCompactFormat">Use the compact log event format defined by
+ /// <a href="https://github.com/serilog/serilog-formatting-compact">Serilog.Formatting.Compact</a>. Has no effect on
+ /// durable log shipping. Requires Seq 3.3+.</param>
  /// <returns>Logger configuration, allowing configuration to continue.</returns>
  /// <exception cref="ArgumentNullException">A required parameter is null.</exception>
  public static LoggerConfiguration Seq(
@@ -65,7 +68,8 @@ public static LoggerConfiguration Seq(
  long? eventBodyLimitBytes = 256 * 1024,
  LoggingLevelSwitch controlLevelSwitch = null,
  HttpMessageHandler messageHandler = null,
- long? retainedInvalidPayloadsLimitBytes = null)
+ long? retainedInvalidPayloadsLimitBytes = null,
+ bool useCompactFormat = false)
  {
  if (loggerSinkConfiguration == null) throw new ArgumentNullException(nameof(loggerSinkConfiguration));
  if (serverUrl == null) throw new ArgumentNullException(nameof(serverUrl));
@@ -84,7 +88,8 @@ public static LoggerConfiguration Seq(
  defaultedPeriod, 
  eventBodyLimitBytes,
  controlLevelSwitch,
- messageHandler);
+ messageHandler,
+ useCompactFormat);
  }
  else
  {

src/Serilog.Sinks.Seq/Sinks/Seq/HttpLogShipper.cs

@@ -33,9 +33,6 @@ namespace Serilog.Sinks.Seq
 {
  class HttpLogShipper : IDisposable
  {
- const string ApiKeyHeaderName = "X-Seq-ApiKey";
- const string BulkUploadResource = "api/events/raw";
-
  static readonly TimeSpan RequiredLevelCheckInterval = TimeSpan.FromMinutes(2);
 
  readonly string _apiKey;
@@ -206,9 +203,9 @@ void OnTick()
 
  var content = new StringContent(payload, Encoding.UTF8, "application/json");
  if (!string.IsNullOrWhiteSpace(_apiKey))
- content.Headers.Add(ApiKeyHeaderName, _apiKey);
+ content.Headers.Add(SeqApi.ApiKeyHeaderName, _apiKey);
 
- var result = _httpClient.PostAsync(BulkUploadResource, content).Result;
+ var result = _httpClient.PostAsync(SeqApi.BulkUploadResource, content).Result;
  if (result.IsSuccessStatusCode)
  {
  _connectionSchedule.MarkSuccess();

src/Serilog.Sinks.Seq/Sinks/Seq/SeqApi.cs

@@ -19,6 +19,11 @@ namespace Serilog.Sinks.Seq
 {
  class SeqApi
  {
+ public const string BulkUploadResource = "api/events/raw";
+ public const string ApiKeyHeaderName = "X-Seq-ApiKey";
+ public const string RawEventFormatMimeType = "application/json";
+ public const string CompactLogEventFormatMimeType = "application/vnd.serilog.clef";
+
  // Why not use a JSON parser here? For a very small case, it's not
  // worth taking on the extra payload/dependency management issues that
  // a full-fledged parser will entail. If things get more sophisticated

src/Serilog.Sinks.Seq/Sinks/Seq/SeqSink.cs

@@ -22,6 +22,8 @@
 using Serilog.Core;
 using Serilog.Debugging;
 using Serilog.Events;
+using Serilog.Formatting.Compact;
+using Serilog.Formatting.Json;
 using Serilog.Sinks.PeriodicBatching;
 
 namespace Serilog.Sinks.Seq
@@ -31,12 +33,13 @@ class SeqSink : PeriodicBatchingSink
  readonly string _apiKey;
  readonly long? _eventBodyLimitBytes;
  readonly HttpClient _httpClient;
- const string BulkUploadResource = "api/events/raw";
- const string ApiKeyHeaderName = "X-Seq-ApiKey";
+
+ static readonly JsonValueFormatter JsonValueFormatter = new JsonValueFormatter();
 
  // If non-null, then background level checks will be performed; set either through the constructor
  // or in response to a level specification from the server. Never set to null after being made non-null.
  LoggingLevelSwitch _levelControlSwitch;
+ readonly bool _useCompactFormat;
  static readonly TimeSpan RequiredLevelCheckInterval = TimeSpan.FromMinutes(2);
  DateTime _nextRequiredLevelCheckUtc = DateTime.UtcNow.Add(RequiredLevelCheckInterval);
 
@@ -50,13 +53,15 @@ public SeqSink(
  TimeSpan period,
  long? eventBodyLimitBytes,
  LoggingLevelSwitch levelControlSwitch,
- HttpMessageHandler messageHandler)
+ HttpMessageHandler messageHandler,
+ bool useCompactFormat)
  : base(batchPostingLimit, period)
  {
  if (serverUrl == null) throw new ArgumentNullException(nameof(serverUrl));
  _apiKey = apiKey;
  _eventBodyLimitBytes = eventBodyLimitBytes;
  _levelControlSwitch = levelControlSwitch;
+ _useCompactFormat = useCompactFormat;
 
  var baseUri = serverUrl;
  if (!baseUri.EndsWith("/"))
@@ -89,13 +94,23 @@ protected override async Task EmitBatchAsync(IEnumerable<LogEvent> events)
  {
  _nextRequiredLevelCheckUtc = DateTime.UtcNow.Add(RequiredLevelCheckInterval);
 
- var payload = FormatPayload(events, _eventBodyLimitBytes);
+ string payload, payloadContentType;
+ if (_useCompactFormat)
+ {
+ payloadContentType = SeqApi.CompactLogEventFormatMimeType;
+ payload = FormatCompactPayload(events, _eventBodyLimitBytes);
+ }
+ else
+ {
+ payloadContentType = SeqApi.RawEventFormatMimeType;
+ payload = FormatRawPayload(events, _eventBodyLimitBytes);
+ }
 
- var content = new StringContent(payload, Encoding.UTF8, "application/json");
+ var content = new StringContent(payload, Encoding.UTF8, payloadContentType);
  if (!string.IsNullOrWhiteSpace(_apiKey))
- content.Headers.Add(ApiKeyHeaderName, _apiKey);
+ content.Headers.Add(SeqApi.ApiKeyHeaderName, _apiKey);
 
- var result = await _httpClient.PostAsync(BulkUploadResource, content).ConfigureAwait(false);
+ var result = await _httpClient.PostAsync(SeqApi.BulkUploadResource, content).ConfigureAwait(false);
  if (!result.IsSuccessStatusCode)
  throw new LoggingFailedException($"Received failed result {result.StatusCode} when posting events to Seq");
 
@@ -115,39 +130,56 @@ protected override async Task EmitBatchAsync(IEnumerable<LogEvent> events)
  }
  }
 
- internal static string FormatPayload(IEnumerable<LogEvent> events, long? eventBodyLimitBytes)
+ internal static string FormatCompactPayload(IEnumerable<LogEvent> events, long? eventBodyLimitBytes)
  {
  var payload = new StringWriter();
- payload.Write("{\"Events\":[");
 
- var delimStart = "";
  foreach (var logEvent in events)
  {
  var buffer = new StringWriter();
 
  try
  {
- RawJsonFormatter.FormatContent(logEvent, buffer);
+ CompactJsonFormatter.FormatEvent(logEvent, buffer, JsonValueFormatter);
  }
  catch (Exception ex)
  {
- SelfLog.WriteLine(
- "Event at {0} with message template {1} could not be formatted into JSON for Seq and will be dropped: {2}",
- logEvent.Timestamp.ToString("o"), logEvent.MessageTemplate.Text, ex);
-
+ LogNonFormattableEvent(logEvent, ex);
  continue;
  }
 
  var json = buffer.ToString();
+ if (CheckEventBodySize(json, eventBodyLimitBytes))
+ {
+ payload.WriteLine(json);
+ }
+ }
+
+ return payload.ToString();
+ }
 
- if (eventBodyLimitBytes.HasValue &&
- Encoding.UTF8.GetByteCount(json) > eventBodyLimitBytes.Value)
+ internal static string FormatRawPayload(IEnumerable<LogEvent> events, long? eventBodyLimitBytes)
+ {
+ var payload = new StringWriter();
+ payload.Write("{\"Events\":[");
+
+ var delimStart = "";
+ foreach (var logEvent in events)
+ {
+ var buffer = new StringWriter();
+
+ try
  {
- SelfLog.WriteLine(
- "Event JSON representation exceeds the byte size limit of {0} set for this Seq sink and will be dropped; data: {1}",
- eventBodyLimitBytes, json);
+ RawJsonFormatter.FormatContent(logEvent, buffer);
  }
- else
+ catch (Exception ex)
+ {
+ LogNonFormattableEvent(logEvent, ex);
+ continue;
+ }
+
+ var json = buffer.ToString();
+ if (CheckEventBodySize(json, eventBodyLimitBytes))
  {
  payload.Write(delimStart);
  payload.Write(json);
@@ -165,5 +197,26 @@ protected override bool CanInclude(LogEvent evt)
  return levelControlSwitch == null ||
  (int)levelControlSwitch.MinimumLevel <= (int)evt.Level;
  }
+
+ static bool CheckEventBodySize(string json, long? eventBodyLimitBytes)
+ {
+ if (eventBodyLimitBytes.HasValue &&
+ Encoding.UTF8.GetByteCount(json) > eventBodyLimitBytes.Value)
+ {
+ SelfLog.WriteLine(
+ "Event JSON representation exceeds the byte size limit of {0} set for this Seq sink and will be dropped; data: {1}",
+ eventBodyLimitBytes, json);
+ return false;
+ }
+
+ return true;
+ }
+
+ static void LogNonFormattableEvent(LogEvent logEvent, Exception ex)
+ {
+ SelfLog.WriteLine(
+ "Event at {0} with message template {1} could not be formatted into JSON for Seq and will be dropped: {2}",
+ logEvent.Timestamp.ToString("o"), logEvent.MessageTemplate.Text, ex);
+ }
  }
 }

src/Serilog.Sinks.Seq/project.json

@@ -1,5 +1,5 @@
 {
- "version": "2.0.1-*",
+ "version": "3.0.0-*",
  "description": "Serilog sink that writes to the Seq event server over HTTP/S.",
  "authors": [ "Serilog Contributors" ],
  "packOptions": {
@@ -10,7 +10,8 @@
  },
  "dependencies": {
  "Serilog": "2.0.0",
- "Serilog.Sinks.PeriodicBatching": "2.0.0"
+ "Serilog.Sinks.PeriodicBatching": "2.0.0",
+ "Serilog.Formatting.Compact": "1.0.0"
  },
  "buildOptions": {
  "keyFile": "../../assets/Serilog.snk"

test/Serilog.Sinks.Seq.Tests/SeqSinkTests.cs

@@ -9,16 +9,32 @@ public class SeqSinkTests
  public void EventsAreFormattedIntoJsonPayloads()
  {
  var evt = Some.LogEvent("Hello, {Name}!", "Alice");
- var json = SeqSink.FormatPayload(new[] {evt}, null);
+ var json = SeqSink.FormatRawPayload(new[] {evt}, null);
  Assert.Contains("Name\":\"Alice", json);
  }
 
  [Fact]
  public void EventsAreDroppedWhenJsonRenderingFails()
  {
  var evt = Some.LogEvent(new NastyException(), "Hello, {Name}!", "Alice");
- var json = SeqSink.FormatPayload(new[] { evt }, null);
+ var json = SeqSink.FormatRawPayload(new[] { evt }, null);
  Assert.Contains("[]", json);
  }
+
+ [Fact]
+ public void EventsAreFormattedIntoCompactJsonPayloads()
+ {
+ var evt = Some.LogEvent("Hello, {Name}!", "Alice");
+ var json = SeqSink.FormatCompactPayload(new[] { evt }, null);
+ Assert.Contains("Name\":\"Alice", json);
+ }
+
+ [Fact]
+ public void EventsAreDroppedWhenCompactJsonRenderingFails()
+ {
+ var evt = Some.LogEvent(new NastyException(), "Hello, {Name}!", "Alice");
+ var json = SeqSink.FormatCompactPayload(new[] { evt }, null);
+ Assert.Empty(json);
+ }
  }
 }