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using System;
using System.Runtime.CompilerServices;
using System.Collections.ObjectModel;
using System.Collections.Generic;
using System.Diagnostics;
using System.Text;
using System.Runtime.InteropServices;
using System.Runtime.Versioning;
using Contract = System.Diagnostics.Contracts.Contract;
#if FEATURE_EVENTSOURCE_XPLAT
namespace System.Diagnostics.Tracing
{
internal class XplatEventLogger : EventListener
{
private static Lazy<string> eventSourceNameFilter = new Lazy<string>(() => CompatibilitySwitch.GetValueInternal("EventSourceFilter"));
private static Lazy<string> eventSourceEventFilter = new Lazy<string>(() => CompatibilitySwitch.GetValueInternal("EventNameFilter"));
public XplatEventLogger() {}
private static bool initializedPersistentListener = false;
[System.Security.SecuritySafeCritical]
public static EventListener InitializePersistentListener()
{
try{
if (!initializedPersistentListener && XplatEventLogger.IsEventSourceLoggingEnabled())
{
initializedPersistentListener = true;
return new XplatEventLogger();
}
}
catch(Exception){}
return null;
}
[DllImport(JitHelpers.QCall, CharSet = CharSet.Unicode)]
private static extern bool IsEventSourceLoggingEnabled();
[DllImport(JitHelpers.QCall, CharSet = CharSet.Unicode)]
private static extern void LogEventSource(int eventID, string eventName, string eventSourceName, string payload);
static List<char> escape_seq = new List<char> { '\b', '\f', '\n', '\r', '\t', '\"', '\\' };
static Dictionary<char, string> seq_mapping = new Dictionary<char, string>()
{
{'\b', "b"},
{'\f', "f"},
{'\n', "n"},
{'\r', "r"},
{'\t', "t"},
{'\"', "\\\""},
{'\\', "\\\\"}
};
private static void minimalJsonserializer(string payload, StringBuilder sb)
{
foreach( var elem in payload)
{
if (escape_seq.Contains(elem))
{
sb.Append("\\\\");
sb.Append(seq_mapping[elem]);
}
else
{
sb.Append(elem);
}
}
}
private static string Serialize(ReadOnlyCollection<string> payloadName, ReadOnlyCollection<object> payload, string sep = ", ")
{
if (payloadName == null || payload == null )
return String.Empty;
if (payloadName.Count == 0 || payload.Count == 0)
return String.Empty;
int eventDataCount = payloadName.Count;
if(payloadName.Count != payload.Count)
{
eventDataCount = Math.Min(payloadName.Count, payload.Count);
}
var sb = StringBuilderCache.Acquire();
sb.Append('{');
for (int i = 0; i < eventDataCount; i++)
{
var fieldstr = payloadName[i].ToString();
sb.Append("\\\"");
sb.Append(fieldstr);
sb.Append("\\\"");
sb.Append(':');
var valuestr = payload[i] as string;
if( valuestr != null)
{
sb.Append("\\\"");
minimalJsonserializer(valuestr,sb);
sb.Append("\\\"");
}
else
{
sb.Append(payload[i].ToString());
}
sb.Append(sep);
}
sb.Length -= sep.Length;
sb.Append('}');
return StringBuilderCache.GetStringAndRelease(sb);
}
internal protected override void OnEventSourceCreated(EventSource eventSource)
{
string eventSourceFilter = eventSourceNameFilter.Value;
if (String.IsNullOrEmpty(eventSourceFilter) || (eventSource.Name.IndexOf(eventSourceFilter, StringComparison.OrdinalIgnoreCase) >= 0))
{
EnableEvents(eventSource, EventLevel.LogAlways, EventKeywords.All, null);
}
}
internal protected override void OnEventWritten(EventWrittenEventArgs eventData)
{
string eventFilter = eventSourceEventFilter.Value;
if (String.IsNullOrEmpty(eventFilter) || (eventData.EventName.IndexOf(eventFilter, StringComparison.OrdinalIgnoreCase) >= 0))
{
LogOnEventWritten(eventData);
}
}
[System.Security.SecuritySafeCritical]
private void LogOnEventWritten(EventWrittenEventArgs eventData)
{
string payload = "";
if (eventData.Payload != null)
{
try{
payload = Serialize(eventData.PayloadNames, eventData.Payload);
}
catch (Exception ex)
{
payload = "XplatEventLogger failed with Exception " + ex.ToString();
}
}
LogEventSource( eventData.EventId, eventData.EventName,eventData.EventSource.Name,payload);
}
}
}
#endif //FEATURE_EVENTSOURCE_XPLAT
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