WCF Rest Service broken after server restart - wcf

Question

I made a WCF Rest Service and attached it to IIS 7 on my server and it worked great. Suddenly, we had a hard drive failure and the guys who're supposed to manage the backups didn't back up anything, so we lost all our stuff on the server.
So I go about setting everything back up, and I put all the stuff on IIS. We have another WCF Rest Service that does a lot of stuff the one I made does, including a couple of the same methods for authentication and such. But now it seems that mine won't work. Our website works and our other web service works, but not this one, and I've no idea why? I set them up the exact same and I don't think I changed anything when I did it initially.
The help reference pages work, but when calling the method, I get
"The server encountered an error processing the request. Please see the service help page for constructing valid requests to the service."
I'm using the same methods as before, calling them with the same arguments, this happens for every method, regardless of GET or POST. I've used a REST extension thing in chrome to call it and the mobile app that I usually use to call it, as well as the browser and they all come up with the same error.
Here's the web.config file for it (I've tried adding a few things found on stackoverflow to get to the problem, but it's not done anything, really).
<?xml version="1.0"?>
<configuration>
<system.web>
<compilation targetFramework="4.0" />
</system.web>
<system.webServer>
<modules runAllManagedModulesForAllRequests="true">
<add name="UrlRoutingModule" type="System.Web.Routing.UrlRoutingModule, System.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
</modules>
</system.webServer>
<system.serviceModel >
<behaviors>
<serviceBehaviors>
<behavior name="DataServiceBehavior">
<serviceMetadata httpGetEnabled="true" />
<serviceDebug includeExceptionDetailInFaults="false"/>
</behavior>
</serviceBehaviors>
</behaviors>
<bindings >
<!-- pick whichever binding you want .... -->
<basicHttpBinding>
<!-- binding configuration with a name -->
<binding name="ExtendedMaxSize"
maxBufferSize="52428800" maxReceivedMessageSize="52428800" >
<readerQuotas maxDepth="52428800" maxStringContentLength="52428800"
maxArrayLength="52428800" maxBytesPerRead="52428800" maxNameTableCharCount="52428800" />
</binding>
</basicHttpBinding>
</bindings>
<serviceHostingEnvironment aspNetCompatibilityEnabled="true" multipleSiteBindingsEnabled="true" />
<standardEndpoints>
<webHttpEndpoint>
<standardEndpoint name="" helpEnabled="true" automaticFormatSelectionEnabled="true" defaultOutgoingResponseFormat="Json" crossDomainScriptAccessEnabled="true" maxReceivedMessageSize="52428800" maxBufferSize="52428800" maxBufferPoolSize="52428800" />
</webHttpEndpoint>
</standardEndpoints>
</system.serviceModel>
</configuration>
After turning tracing on, got this error from the viewer:
<E2ETraceEvent xmlns="http://schemas.microsoft.com/2004/06/E2ETraceEvent"><System
xmlns="http://schemas.microsoft.com/2004/06/windows/eventlog/system"><EventID>131076</EventID><Type>3</Type><SubType Name="Error">0</SubType><Level>2</Level><TimeCreated SystemTime="2014-03-27T12:15:47.5749853Z" /><Source Name="System.ServiceModel" /><Correlation ActivityID="{54672f7e-5a71-4dda-92a3-f07f7c94ccb9}" /><Execution ProcessName="w3wp" ProcessID="20820" ThreadID="9" /><Channel /><Computer>OHS-VMHOST-NEW</Computer></System><ApplicationData><TraceData><DataItem><TraceRecord Severity="Error" Channel="Operational" xmlns="http://schemas.microsoft.com/2004/10/E2ETraceEvent/TraceRecord"><TraceIdentifier>http://msdn.microsoft.com/en-GB/library/System.ServiceModel.Diagnostics.TraceHandledException.aspx</TraceIdentifier><Description>Handling an exception. Exception details: System.FormatException: Guid should contain 32 digits with 4 dashes (xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx).
at System.Guid.GuidResult.SetFailure(ParseFailureKind failure, String failureMessageID, Object failureMessageFormatArgument, String failureArgumentName, Exception innerException)
at System.Guid.TryParseGuidWithNoStyle(String guidString, GuidResult& result)
at System.Guid.TryParseGuid(String g, GuidStyles flags, GuidResult& result)
at System.Guid..ctor(String g)
at OHS.MobileAssessor.Services.MobileAssessorAPIService.GetProjectData(String token)
at SyncInvokeGetProjectData(Object , Object[] , Object[] )
at System.ServiceModel.Dispatcher.SyncMethodInvoker.Invoke(Object instance, Object[] inputs, Object[]& outputs)
at System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin(MessageRpc& rpc)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage5(MessageRpc& rpc)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage31(MessageRpc& rpc)
at System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean isOperationContextSet)</Description><AppDomain>/LM/W3SVC/1/ROOT/mobileassessor-1-130403961472161807</AppDomain><Exception><ExceptionType>System.FormatException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</ExceptionType><Message>Guid should contain 32 digits with 4 dashes (xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx).</Message><StackTrace> at System.Guid.GuidResult.SetFailure(ParseFailureKind failure, String failureMessageID, Object failureMessageFormatArgument, String failureArgumentName, Exception innerException)
at System.Guid.TryParseGuidWithNoStyle(String guidString, GuidResult&amp; result)
at System.Guid.TryParseGuid(String g, GuidStyles flags, GuidResult&amp; result)
at System.Guid..ctor(String g)
at OHS.MobileAssessor.Services.MobileAssessorAPIService.GetProjectData(String token)
at SyncInvokeGetProjectData(Object , Object[] , Object[] )
at System.ServiceModel.Dispatcher.SyncMethodInvoker.Invoke(Object instance, Object[] inputs, Object[]&amp; outputs)
at System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin(MessageRpc&amp; rpc)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage5(MessageRpc&amp; rpc)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage31(MessageRpc&amp; rpc)
at System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean isOperationContextSet)</StackTrace><ExceptionString>System.FormatException: Guid should contain 32 digits with 4 dashes (xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx).
at System.Guid.GuidResult.SetFailure(ParseFailureKind failure, String failureMessageID, Object failureMessageFormatArgument, String failureArgumentName, Exception innerException)
at System.Guid.TryParseGuidWithNoStyle(String guidString, GuidResult&amp; result)
at System.Guid.TryParseGuid(String g, GuidStyles flags, GuidResult&amp; result)
at System.Guid..ctor(String g)
at OHS.MobileAssessor.Services.MobileAssessorAPIService.GetProjectData(String token)
at SyncInvokeGetProjectData(Object , Object[] , Object[] )
at System.ServiceModel.Dispatcher.SyncMethodInvoker.Invoke(Object instance, Object[] inputs, Object[]&amp; outputs)
at System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin(MessageRpc&amp; rpc)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage5(MessageRpc&amp; rpc)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage31(MessageRpc&amp; rpc)
at System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean isOperationContextSet)</ExceptionString></Exception></TraceRecord></DataItem></TraceData></ApplicationData></E2ETraceEvent>
As requested, my GetProjectData method (And no, it isn't managing to write anything to my event log):
/// <summary>
///
/// </summary>
/// <param name="token"></param>
/// <returns></returns>
[WebGet(UriTemplate = "GetProjectData/{token}", ResponseFormat = WebMessageFormat.Json)]
public GetProjectContainerResult GetProjectData(string token)
{
WriteLog("Getting project data...");
GetProjectContainerResult result = new GetProjectContainerResult();
ProjectContainer container = new ProjectContainer();
MobileAssessorAuthenticationResults authResult = ValidateToken(new Guid(token));
if (authResult == MobileAssessorAuthenticationResults.Success)
{
container.jobs = getJobs(token);
container.buildings = getBuildings();
container.floors = getFloors();
container.locations = getLocations();
result.ReturnValue = container;
result.Result = MobileAssessorOperationResults.Success;
}
else
{
switch (authResult)
{
case MobileAssessorAuthenticationResults.Error:
result.Result = MobileAssessorOperationResults.Error;
result.ResultDescription = "An error occured.";
result.ReturnValue = new ProjectContainer();
break;
case MobileAssessorAuthenticationResults.Expired:
result.Result = MobileAssessorOperationResults.Failed;
result.ResultDescription = "The specified token has expired.";
result.ReturnValue = new ProjectContainer();
break;
case MobileAssessorAuthenticationResults.Invalid:
result.Result = MobileAssessorOperationResults.Failed;
result.ResultDescription = "The specified token is not valid.";
result.ReturnValue = new ProjectContainer();
break;
}
}
return result;
}

Answer 1

Looking at the stack trace from your log, I think you are having issues parsing a GUID in MobileAssessorAPIService.GetProjectData method
at System.Guid.TryParseGuidWithNoStyle(String guidString, GuidResult& result)
at System.Guid.TryParseGuid(String g, GuidStyles flags, GuidResult& result)
at System.Guid..ctor(String g)
at OHS.MobileAssessor.Services.MobileAssessorAPIService.GetProjectData(String token)
I would recommend that you put a break point in this method and attach a debugger to your REST service.
Based on the code you posted, the suspected line is
MobileAssessorAuthenticationResults authResult = ValidateToken(new Guid(token));
if you are not able to remotely debug this, I would recommend that you add logging just before this line to log the value of token. something like
logger.Log("paramater token = " + token);
Alternately, use wireshark to check the value of the token. once you extract the value of that guid, validate it online at http://guid.us/Test/GUID