Remote Debugging On Azure

I decided that I needed to learn a bit about remote debugging on Azure.  I know that you are supposed to use the Azure emulator to hash out your problems before hand, but I still would like the ability to debug remotely in case the need comes up.

I Googled on Bing how to do it and I ran across this article that seems to be a good place to start.  It looks like I need to upload the VS2010 remote tools to Azure as a necessary but not sufficient step.  The thing is, I have no idea how to do that.  Do I upload the tools only once to my azure account?  Is it site && project specific?  I don’t know and Binging on Google doesn’t seem to help.

I then looked at this article but it assumes that I am using a Virtual Machine and installing the MSVSMON.exe to the VM.  If that was the case, I would just install VS2010 to the VM and debug there.  So that article is of no help.

I am stuck on this line of the 1st article: “You can find the tools on Microsoft Download Center here, and then upload to your storage account using whatever Windows Azure Storage account tool of your choice. “  Going over to my Azure account, I see a “Storage” section.

So I create a new storage like so:

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The illogical meter is running high.  Why should I need to install Data Services to install MSVSMON?  I can do Computer-> Cloud Service, but that us the same as creating a Cloud Service.

I decided to work in the other direction.  I created a new Azure hosted WCF Service in VS2010 like so:

 

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and after the default template of this:

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I changed Service1 name and then added a single method that returns the sum of two numbers:

public class AddingMachine : IAddingMachine
{
    public Int32 Add(Int32 number1, Int32 number2)
    {
        return number1 + number2;
    }

}

I then deployed his to the Azure server via Visual Studio – 1st I set up the deployment parameters

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Then I added a certificate

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And during the deployment I got this:

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After a couple of minutes, I got the site up on Azure:

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Which I assume might be the way to remote debug?  I then hit myself in the head that the Build Configuration is Release (the default) and not debug and I need the debug symbols to remote debug.  I deployed again and then I opened attach to process in Visual Studio:

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I then pumped in the name of the site:

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Doh!

Time to go to Brian Hitney’s office hours!

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Data Transfer using WCF

So forgetting OData for a minute (not hard to do), I was thinking about how to transfer SDO classes to and from a WCF service.  All of the WCF projects I have worked on have been POCOs with the appropriate WCF attributes from System.ServiceModel and System.Runtime.Serialization.  I never thought about putting an ADO.NET recordset as a return value from a WCF method.  I also wondered about putting the recordset as a parameter to a WCF method.  I assume it is possible, I was curious about how much effort it would take.  I Binged on Google (or was it Googled on Bing) and these was nothing that jumped out.

I fired up a typical WCF project and then added a consuming console app to the solution.  I then wrote an interface that returns a dataTable like so:

[ServiceContract]
public interface IDataFactory
{
    [OperationContract]
    DataTable GetDataTable();
}
public class DataFactory : IDataFactory
{
    public DataTable GetDataTable()
    {
        throw new NotImplementedException();
    }
}

I then hit F6 and sure enough it compiled.  I then changed the implementation to this

public DataTable GetDataTable()
{
    DataTable dataTable = new DataTable();
    dataTable.TableName = "Customers";
    dataTable.Columns.Add("CustomerId");
    dataTable.Columns.Add("CustomerName");

    DataRow row1 = dataTable.NewRow();
    row1[0] = 1;
    row1[1] = "Customer #1";
    dataTable.Rows.Add(row1);
    DataRow row2 = dataTable.NewRow();
    row2[0] = 2;
    row2[1] = "Customer #2";
    dataTable.Rows.Add(row2);

    return dataTable;

}

and I am still compiling.  So then I went to the client and added a reference and it worked:

image

I then fired up the client like so:

static void Main(string[] args)
{
    Console.WriteLine("Starting");

    DataFactoryClient client = new DataFactoryClient();
    DataTable table = client.GetDataTable();

    foreach (DataRow row in table.Rows)
    {
        Console.WriteLine(String.Format("Customer {0} named {1}.",row[0],row[1]));
    }

    Console.WriteLine("Ending");
    Console.ReadKey();
}

And I hit F5:

image

 

Wow.  Microsoft made this stupid simple.

I then though about how to pass in an individual data row. 

[OperationContract]
String InsertDataRow(DataRow row);
public String InsertDataRow(DataRow row)
{
    return String.Format("You entered {0}.", row[0].ToString());
}

And when I hit update reference from my consuming app, I got this:

image

Crud!  I then thought I could just add a serializable data row like so:

[Serializable]
public class SerializableDataRow: DataRow
{
}

And this:

[OperationContract]
String InsertDataRow(SerializableDataRow row);

But no, I get this:

image

So now I have to jump down a rabbit hole and possible violate the Liskov Substitution Principle.  Since I want things to be stupid simple, I gave up with inheritance.  I then found this post.  So either use a datatable (and suffer the overhead) or convert the DataRow into something that can be seialized (like XML, custom classes, etc..)

So I give Microsoft a C on this – somewhat stupid simple, but not entirely…

Web Stress Tests: Part 2

Now that I have a web performance test that is run repeatedly by the loadtest, I want to alter a couple of things.  First, I want to change the Url from local host to another environment.  In my case, WinHost.  Here are the two Urls:

http://localhost:3002/AddingMachine.svc
http://www.tenfingersfree.com/tff/AddingMachine.svc

To allow the Url to be configurable, I want into the Web Text Editor and pressed on the parameterize Web Servers button

image

After this dialog box:

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The Web Test in the project auto-magically puts in a parameter into its Url property

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I then updated the Url to include the service name

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I then ran my web test and it failed.

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Apparently, I don’t need the service name in there.  Taking it out gives me green.

I then swapped in the WinHost web server and I still get green

 

So the next thing I want to make dynamic are the input parameters.  To that end, I created a notepad file like so:

image

I then changed the extension to .csv and imported it into the web test via the Add Data Source button on the test

 

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It looks by default it assumes the 1st row is a column heading.  The only thing I changed from the default is the access method property of the table to random:

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I now have to get these values into the String Body.  The MSDN documentation assumes that I will be altering input via the query parameter or the post parameters.  I am not doing that, I need to update the String Body.

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to

image

When I ran it, I got this:

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I then binged into this article that showed me how my data source syntax was wrong and how to get the correct syntax generated for me:

 

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And I updated the string body like so:

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And sure enough – different numbers thrown at my web service:

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Wahoo!

Web Performance Test

 

So I decided I wanted to learn more about the testing capabilities of VS2010 – esp. load testing a web service.  I fired up Visual Studio and created an out of the box WCF Service with the following 1 method:

public class AddingMachine : IAddingMachine
{
    public int GetData(int value1, int value2)
    {
        Random random = new Random();
        Int32 delay = random.Next(15);
        Thread.Sleep(TimeSpan.FromSeconds(delay));

        return value1 + value2;
    }
}

I then added a new test project using a Web Performance Test template:

image

I then hit record, closed IE which automatically popped up, and navigated to the service using the WCF Test Client. 

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I am sure you are not surprised that nothing was recorded.  The problem is that the out of the box Web Performance Test assumes that you are calling a web site so I couldn’t just hit a recording and navigate to a webservice the same way I would navigate to a website.

Instead, I had to right click and add a new web service request.  I then changed the Url property to the service location and tried to run the test.

image

I then binged on Google and ran across a couple of Stack Overflow posts and this nugget on MSDN.  Apparently, I need to use Fiddler to capture the request.  I fired up Fiddler and WCF Test Client (remember the “.” after local host) and sure enough and can make the call and intercept the traffic:

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I copied the entire request from Fiddler:

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But I got this when I ran the test I got the same exception.  The problem is that the article assumes an .asmx web service and I am using WCF.  Digging into the article’s code sample, I realized that I needed a Header like so:

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and I needed to put only the body from Fiddler into the String Body property

Fiddler:

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WebTest:

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And green is good

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