# Friday, 16 November 2018

In a previous article, I showed you how to create a new Azure Function with an HTTP trigger.

After you create an Azure Function, it is useful to be able to test it right in the Azure Portal.

To test an Azure function, log into the Azure Portal, open the Function App, and select your Function, as shown in Fig. 1

TF01-Function
Fig. 1

Click the [Run] button (Fig. 2) above the Function to open a Log output window and a Testing dialog, as shown in in Fig. 3.

TF02-RunButton
Fig. 2

TF03-TestDialog
Fig. 3

In the Test dialog on the right, you can change the HTTP verb by selecting either "POST" or "GET" in the "HTTP method" dropdown, as shown in Fig. 4.

TF04-HttpMethod
Fig. 4

If you select the "POST" HTTP method, the "Request body" section (Fig. 5) is enabled and you can modify the data you want to send in the HTTP Body of your request.

TF05-RequestBody
Fig. 5

You can add querystring parameters to your request by clicking the "+ Add parameter" link under "Query" (Fig. 6) and entering a name and value of the parameter, as shown in Fig. 7.

TF06-QueryParameters
Fig. 6

TF07-AddParameter
Fig. 7

Repeat this for as many querystring parameters as you need.

Similarly, you can add name/value pairs to the HTTP header of your  request by clicking the "+ Add header" link and entering the name and value of each header, as shown in Fig. 8.

TF08-AddHeader
Fig. 8

When everything is configured the way you want, click the [Run] button at the bottom (Fig.9) to call the web service and trigger your function.

TF09-RunButton
Fig. 9

The "Output" section (Fig. 10) will display the HTTP response, as well as any text returned in the body of the response. Any response between 200 and 299 is good; any response of 400 and above indicates an error.

TF10-Output
Fig. 10

If you function outputs log information, you will see this in the Log output window, as shown in Fig. 11.

TF11-LogOutput
Fig. 11

In this article, I showed how to test a function from within the Azure portal. You should create more sophisticated automated test as part of your build/deploy process, but this serves as a good, simple way to make sure your function is behaving as expected after you create it.

Friday, 16 November 2018 19:06:00 (GMT Standard Time, UTC+00:00)
# Thursday, 15 November 2018

GCast 22:

Creating an Azure Function Proxy

Learn how to create a proxy URL using Azure Functions

Thursday, 15 November 2018 09:49:00 (GMT Standard Time, UTC+00:00)
# Wednesday, 14 November 2018

In the last article, I showed how to create an Azure Function App. A Function App is not useful by itself: it is just a container for functions, which perform the real work.

Once you have created an Azure Function App, you will want to add one or more Functions to it.

Navigate to the Azure Portal, log in, and open your Function app, as shown in Fig. 1.

Fu01-FunctionApp
Fig. 1

Click either the [+] icon next to the "Functions" section on the left (Fig. 2) or the [New function] button at the bottom (Fig. 3)

Fu02-NewFunctionIcon
Fig. 2

Fu03-NewFunctionButton
Fig. 3

NOTE: If this Function App already contains at least one function, the [New function] button does not display.

The "CHOOSE A DEVELOPMENT ENVIRONMENT" page of the "Azure Functions for .NET - getting started" dialog displays, as shown in Fig. 4

Fu04-ChooseDevEnv
Fig. 4

Select the [In-portal] tile and click the [Continue] button to advance to the "CREATE A FUNCTION" page, as shown in Fig. 5

Fu05-CreateAFunction
Fig. 5

Two triggers are listed: "Webhook+API", which will cause your function to execute after a web service URL is hit; and "Timer", which allows you to schedule your function to run at regular intervals. You can see more triggers by clicking the "More templates…" tile; but, for this demo, select the [Webhook+API] tile and click the [Create] button. After a few seconds, a function is created with an HTTP trigger and some sample code, as shown in Fig. 6.

Fu06-NewFunction
Fig. 6

This sample function accepts a "name" parameter (either in the querystring or in the Body of a POST request) and returns an HTTP 200 (OK) response with the string "Hello, ", followed by the value of the name parameter. If no "name" parameter is supplied,  it returns a 400 (Bad Request) response with an error message.

You can now modify and save this code as you like.

In the next article, I will show you how to test this function within the portal.

Wednesday, 14 November 2018 09:59:00 (GMT Standard Time, UTC+00:00)
# Tuesday, 13 November 2018

An Azure Function allows you to deploy scalable code to the cloud without worrying about the server or other infrastructure issues.

Azure Functions are contained within a Function App, so you need to create a Function App first.  To create a Function App, navigate to the Azure Portal, sign in and click the [Create a resource] button, as shown in Fig. 1.

FA01-CreateAResource
Fig. 1

From the menu, select Compute | Function App, as shown in Fig. 2.

FA02-ComputeFunctionApp
Fig. 2

The "Create Function App" blade displays as shown in Fig. 3

FA03-CreateFunctionAppBlade
Fig. 3

At the "App Name" field, enter a unique name for your Function App.

At the "Subscription" field, select the Azure subscription with which to associate this Function App. Most people will have only one subscription.

At the "Resource Group" field, select "Create new" and enter the name of a Resource Group to create or select "Use existing" and select an existing resource group in which to store your Function App. A Resource Group is an organizational grouping of related assets in Azure.

At the "OS" radio button, select the operating system (Windows or Linux) on which you wish to host your Function App.

At the Hosting plan, select either "Consumption Plan" or "App Service Plan". With the Consumption Plan, you only pay for the time that your functions are running. Since most functions do not run 24 hours a day / 7 days a week, this can be a real cost savings. With the App Service Plan, you pay as long as your functions are available. This is appropriate if you expect clients to be constantly calling your functions.

At the "Location" field, enter a region in which you want your Functions to run. In order to minimize latency, you should select a region close to any resources with which the Functions will interact.

At the "Runtime Stack" dropdown, select one of the platforms. Select ".NET" if you plan to write your code in C# or F#. Select "JavaScript" if you plan to create a node function. Select "Java" if you plan to write your code in Java. As of this writing, Java is in Preview, so performance is not guaranteed.

If you selected "Consumption Plan" hosting plan, you will be prompted for a storage account. Function definitions will be stored in this account. Select an existing storage account or create a new one. I prefer to use a storage account for all my Function Apps in a given Resource Group.

For extra monitoring, turn on Application Insights and select the same region in which your Function App is located. If this region is not available, select a nearby region.

Click the [Create] button to create your Function App.

After your Function App is created, you will want to add a Function to it. I will show how to do this in the next article.

Tuesday, 13 November 2018 09:54:00 (GMT Standard Time, UTC+00:00)
# Monday, 12 November 2018

Episode 537

Robert Greene on DevOps

Robert Greene defines DevOps, discusses its advantages, and describes how to accomplish it with Microsoft tooling.

Monday, 12 November 2018 09:29:00 (GMT Standard Time, UTC+00:00)
# Sunday, 11 November 2018

FrankensteinFrankenstein is the story of Victor Frankenstein, a scientist who discovers a way to re-animate dead tissue and uses this knowledge to build a giant, grotesque creature. Victor is repulsed by his creation and rejects it, which angers the creature and inspires him to seek revenge on his creator by destroying those closest to him.

The story of Frankenstein is familiar to almost everyone - primarily through the 1931 movie and the works that it inspired. But the original novel by Mary Wollstonecraft Shelley, published in 1818 offers much that later interpretations do not.

The novel differs from most later interpretations of the story by how much is given to the creature displays complex feelings and motivations. Unlike Karloff's mute, shuffling monstrosity, Shelley's monster was self-educated, literate, and articulate. He feels the betrayal of his maker and the pain of rejection by the world. He takes out this pain by destroying everyone that Victor loves.

In this classic horror novel, Shelley explores the dangers of playing God, the power of loneliness, and the fear of losing all that we love. She even brings in the responsibilities that fathers have for their children - a topic at least as relevant today as it was 200 years ago. Victor Frankenstein is the ultimate deadbeat dad. he runs from his responsibilities, abandoning his offspring when needed most.

There are two evil creatures in this book. Victor shirks his responsibilities and abandons the creature he created, primarily because of its physical deformities. The monster dreamed of love and acceptance; but turned to evil and violence and revenge when he was rejected by his creator and by the world.

Mary Shelley was a pioneer in the science fiction and the horror genres and the longevity of "Frankenstein" is a testament to this standing.

Sunday, 11 November 2018 09:29:00 (GMT Standard Time, UTC+00:00)
# Saturday, 10 November 2018

JeffLorberIt took 40 years of recording for Jeff Lorber to finally win a Grammy. After 6 times a bridesmaid,
"Prototype" by The Jeff Lorber Fusion won the award for Best Contemporary Instrumental Album this January.

And it took just as long for me to finally see The Jeff Lorber Fusion in concert, which I did Wednesday night at The Promontory in Chicago's Hyde Park.

Reserved seating was listed as "Sold Out" but I managed to get a seat at a table, thanks to someone canceling and me showing up an hour before the doors opened.

The concert was a fundraiser for the Musical Arts Institute, so the evening began with performances by a number of members and students of the institute. It was entertaining half hour of music, but the performers definitely amateurs - many of them in their teens.

Not so with the main act. Jeff Lorber is as professional as they come, and he brought technical proficiency with high energy jazz fusion throughout his set.

Lorber played with a trio that included two local Chicagoans, including bassist Michael Manson (director of the Musical Arts Institute), who nearly stole the show with his amazing playing and a face that morphed like a jellyfish.

But it was Jeff Lorber's show and he did not disappoint. The energy remained high throughout the night and every song was great. Highlights included "What's the Deal" and "Test Drive" from his Grammy-winning album; "Montserrat" from "Galaxy"; and "Rain Dance", a song that has been sampled by multiple artists, including Notorious B.I.G., Ariana Grande, Ja Rule, and Mariah Carey.  I don't recall any ballads during the show.

The trio did not play a long set - perhaps 90 minutes - but the audience left feeling we got our money's worth.

Photos

Saturday, 10 November 2018 09:26:00 (GMT Standard Time, UTC+00:00)
# Friday, 09 November 2018

Azure Functions provide a simple way to deploy code in a scalable, cost-effective way.

The beauty of Azure functions is that the developer does not need to worry about where they are deployed. Azure takes care of spinning up a server and other resources at the appropriate time and scaling out a Function as demand increases. The infrastructure is abstracted away from the developer allowing the developer to focus on the code and the business problem.

Azure functions can be written in C#, F#, JavaScript, or Java.

Each Function has a "Trigger" which, as the name implies is an event that causes the function code to run. This can be an HTTP request, a message on a queue or message bus, delivery of an email, data inserted into a blob storage container or CosmosDB database, or a timed interval.

Triggers are just one way that Azure functions can easily connect to other services. There are also bindings available to interact with databases, queues, and other services with a minimum of code.

One nice feature of Azure Function Apps is the "Consumption Plan" pricing model. Selecting this plan means that you are only charged while your function is running, which can save plenty of money - particularly if your app is not running 24 hours a day every day. Of course, you can also choose to run your function as part of an App Service Plan, in which case you will pay for the entire time the function is available, whether or not it is running. This may be desirable if you already have an App Service Plan running and want to include your functions in that same plan.

You can create functions directly in the Azure Portal. Or you can create them locally using tools like Visual Studio and Visual Code and deploy them either directly from the IDE or through your continuous integration processes.

The source code for the Azure Functions run-time is even open source! Check out the code at https://github.com/Azure/azure-functions-host.

You can get a free Azure account at http://azure.com. You can read more about Azure functions at https://docs.microsoft.com/en-us/azure/azure-functions.

In upcoming articles, I'll show you how to create, deploy, test, and manage Azure functions.

Friday, 09 November 2018 09:25:00 (GMT Standard Time, UTC+00:00)
# Thursday, 08 November 2018

GCast 21:

Azure Functions Continuous Deployment

Learn how to configure continuous deployment from GitHub to Azure functions. Each time you push code changes to GitHub, that code is automatically deployed to Azure.

Thursday, 08 November 2018 09:48:00 (GMT Standard Time, UTC+00:00)
# Wednesday, 07 November 2018

In the last article, I showed how to create a new Azure CosmosDB account. In this article, I will show how to add a database with containers to that account.

Navigate to the Azure portal and sign in; then open your Azure CosmosDB account. You may be directed to either the "Quick start" blade (Fig. 1) or the "Overview" blade (Fig. 2)

Co01-CosmosDBAccountQuickStart
Fig. 1

Co02-CosmosDBAccountOverview
Fig. 2

Open the "Data Explorer" blade, as shown in Fig. 3.

Co03-CosmosDBAccountDataExplorer
Fig. 3

For a newly-created account, no databases are listed.

To create a new database, click the [New Database] button (Fig. 4).

Co04-NewDatabaseButton
Fig. 4

The "New Database" blade displays, as shown in Fig. 5.

Co05-NewDatabaseBlade
Fig. 5

At the "Database id" field, enter a unique id for your database.

Click the [OK] button.

After a few seconds, a new database will display in the "Data Explorer" blade, as shown in Fig. 6.

Co06-Database
Fig. 6

In a CosmosDB database, documents are stored within collections, which help you to organize your data. To create  a new collection, right-click the database and select "New Collection" from the context menu, as shown in Fig. 7

Co07-NewCollectionMenu
Fig. 7

The "Add Collection" blade displays, as shown in Fig. 8

Co08-AddCollectionBlade
Fig. 8

At the "Collection Id" field, enter a name for your collection. Collection names must be unique within a database.

Select the appropriate Storage capacity. If you expect to store a small amount of data, select "Fixed"; for databases expected to grow beyond 10GB, select "Unlimited".

If you select unlimited, you can specify a path within each document to find the Partition Key. A Partition Key is used to determine which data to keep together when distributing data across multiple servers.

At the "Throughput" field, enter the number of 1K documents per second you need to process. You will pay more for higher throughput, so consider whether you need a higher throughput before increasing this value.

Click the [OK] button to create the collection.

The new collection will display beneath the database as shown in Fig. 9. You may need to expand the tree in order to see the collection.

Co09-DBandCollection
Fig. 9

You can write to and read from this collection programmatically or you can upload document within the portal by clicking the [Upload] button, as shown in Fig. 10.

Co10-UploadButton
Fig. 10

Data in a CosmosDB account is stored in databases and collections. This article showed how to create these.

Wednesday, 07 November 2018 06:36:00 (GMT Standard Time, UTC+00:00)