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//------------------------------------------------------------------------------
// <copyright file="IisTraceListener.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
using System;
using System.Text;
using System.Web;
using System.Web.Hosting;
using System.Web.UI;
using System.Diagnostics;
using System.Globalization;
using System.Security.Permissions;
namespace System.Web {
[HostProtection(Synchronization=true)]
public sealed class IisTraceListener : TraceListener {
public IisTraceListener() {
// only supported on IIS version 7 and later
HttpContext context = HttpContext.Current;
if (context != null) {
if (!HttpRuntime.UseIntegratedPipeline && !(context.WorkerRequest is ISAPIWorkerRequestInProcForIIS7)) {
throw new PlatformNotSupportedException(SR.GetString(SR.Requires_Iis_7));
}
}
}
// the listener apis
public override void Write(string message)
{
if (Filter != null && !Filter.ShouldTrace(null, String.Empty, TraceEventType.Verbose, 0, message, null, null, null))
return;
HttpContext context = HttpContext.Current;
if (context != null) {
context.WorkerRequest.RaiseTraceEvent(IntegratedTraceType.TraceWrite, message);
}
}
public override void Write(string message, string category)
{
if (Filter != null && !Filter.ShouldTrace(null, String.Empty, TraceEventType.Verbose, 0, message, null, null, null))
return;
HttpContext context = HttpContext.Current;
if (context != null) {
context.WorkerRequest.RaiseTraceEvent(IntegratedTraceType.TraceWrite, message);
}
}
public override void WriteLine(string message)
{
if (Filter != null && !Filter.ShouldTrace(null, String.Empty, TraceEventType.Verbose, 0, message, null, null, null))
return;
HttpContext context = HttpContext.Current;
if (context != null) {
context.WorkerRequest.RaiseTraceEvent(IntegratedTraceType.TraceWrite, message);
}
}
public override void WriteLine(string message, string category)
{
if (Filter != null && !Filter.ShouldTrace(null, String.Empty, TraceEventType.Verbose, 0, message, null, null, null))
return;
HttpContext context = HttpContext.Current;
if (context != null) {
context.WorkerRequest.RaiseTraceEvent(IntegratedTraceType.TraceWrite, message);
}
}
public override void TraceData(TraceEventCache eventCache, String source, TraceEventType eventType, int id, object data) {
if (Filter != null && !Filter.ShouldTrace(eventCache, source, eventType, id, null, null, data, null))
return;
HttpContext context = HttpContext.Current;
if (context != null) {
string datastring = String.Empty;
if (data != null) {
datastring = data.ToString();
}
context.WorkerRequest.RaiseTraceEvent(Convert(eventType), AppendTraceOptions(eventCache, datastring));
}
}
public override void TraceData(TraceEventCache eventCache, String source, TraceEventType eventType, int id, params object[] data) {
HttpContext context = HttpContext.Current;
if (context == null)
return;
if (Filter != null && !Filter.ShouldTrace(eventCache, source, eventType, id, null, null, null, data))
return;
StringBuilder sb = new StringBuilder();
if (data != null) {
for (int i=0; i< data.Length; i++) {
if (i != 0)
sb.Append(", ");
if (data[i] != null)
sb.Append(data[i].ToString());
}
}
if (context != null) {
context.WorkerRequest.RaiseTraceEvent(Convert(eventType), AppendTraceOptions(eventCache, sb.ToString()));
}
}
public override void TraceEvent(TraceEventCache eventCache, String source, TraceEventType severity, int id, string message) {
if (Filter != null && !Filter.ShouldTrace(eventCache, source, severity, id, message, null, null, null))
return;
HttpContext context = HttpContext.Current;
if (context == null)
return;
context.WorkerRequest.RaiseTraceEvent(Convert(severity), AppendTraceOptions(eventCache, message));
}
public override void TraceEvent(TraceEventCache eventCache, String source, TraceEventType severity, int id, string format, params object[] args) {
TraceEvent(eventCache, source, severity, id, String.Format(CultureInfo.InvariantCulture, format, args));
}
// append trace options to message and return the result
private String AppendTraceOptions(TraceEventCache eventCache, String message) {
if (eventCache == null || TraceOutputOptions == TraceOptions.None) {
return message;
}
StringBuilder sb = new StringBuilder(message, 1024);
if (IsEnabled(TraceOptions.ProcessId)) {
sb.Append("\r\nProcessId=");
sb.Append(eventCache.ProcessId);
}
if (IsEnabled(TraceOptions.LogicalOperationStack)) {
sb.Append("\r\nLogicalOperationStack=");
bool first = true;
foreach (Object obj in eventCache.LogicalOperationStack) {
if (!first) {
sb.Append(", ");
}
else {
first = false;
}
sb.Append(obj);
}
}
if (IsEnabled(TraceOptions.ThreadId)) {
sb.Append("\r\nThreadId=");
sb.Append(eventCache.ThreadId);
}
if (IsEnabled(TraceOptions.DateTime)) {
sb.Append("\r\nDateTime=");
sb.Append(eventCache.DateTime.ToString("o", CultureInfo.InvariantCulture));
}
if (IsEnabled(TraceOptions.Timestamp)) {
sb.Append("\r\nTimestamp=");
sb.Append(eventCache.Timestamp);
}
if (IsEnabled(TraceOptions.Callstack)) {
sb.Append("\r\nCallstack=");
sb.Append(eventCache.Callstack);
}
return sb.ToString();
}
private bool IsEnabled(TraceOptions opts) {
return (opts & TraceOutputOptions) != 0;
}
private IntegratedTraceType Convert(TraceEventType tet) {
switch (tet) {
case TraceEventType.Critical:
return IntegratedTraceType.DiagCritical;
case TraceEventType.Error:
return IntegratedTraceType.DiagError;
case TraceEventType.Warning:
return IntegratedTraceType.DiagWarning;
case TraceEventType.Information:
return IntegratedTraceType.DiagInfo;
case TraceEventType.Verbose:
return IntegratedTraceType.DiagVerbose;
case TraceEventType.Start:
return IntegratedTraceType.DiagStart;
case TraceEventType.Stop:
return IntegratedTraceType.DiagStop;
case TraceEventType.Suspend:
return IntegratedTraceType.DiagSuspend;
case TraceEventType.Resume:
return IntegratedTraceType.DiagResume;
case TraceEventType.Transfer:
return IntegratedTraceType.DiagTransfer;
}
// Default to verbose logging
return IntegratedTraceType.DiagVerbose;
}
}
}
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