Azure Serverless Computing Cookbook E-Book

Praveen Kumar Sreeram

• Herausgeber: Packt Publishing
• Kategorie: Fachliteratur
• Sprache: Englisch

Seitenzahl: 277

Veröffentlichungsjahr: 2018

Beschreibung

Microsoft provides a solution for easily running small segments of code in the cloud with Azure Functions. The second edition of Azure Serverless Computing Cookbook starts with intermediate-level recipes on serverless computing along with some use cases demonstrating the benefits and key features of Azure Functions. You’ll explore the core aspects of Azure Functions, such as the services it provides, how you can develop and write Azure Functions, and how to monitor and troubleshoot them.
As you make your way through the chapters, you’ll get practical recipes on integrating DevOps with Azure Functions, and providing continuous integration and continuous deployment with Azure DevOps. This book also provides hands-on, step-by-step tutorials based on real-world serverless use cases to guide you through configuring and setting up your serverless environments with ease. You will also learn how to build solutions for complex, real-world, workflow-based scenarios quickly and with minimal code using Durable Functions. In the concluding chapters, you will ensure enterprise-level security within your serverless environment. The most common tips and tricks that you need to be aware of when working with Azure Functions on production environments will also be covered in this book.
By the end of this book, you will have all the skills required for working with serverless code architecture, providing continuous delivery to your users.

Leseprobe

Azure Serverless Computing CookbookSecond Edition

Build and monitor Azure applications hosted on serverless architecture using Azure Functions

Praveen Kumar Sreeram

BIRMINGHAM - MUMBAI

Azure Serverless Computing Cookbook Second Edition

Copyright © 2018 Packt Publishing

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Packt Publishing has endeavored to provide trademark information about all of the companies and products mentioned in this book by the appropriate use of capitals. However, Packt Publishing cannot guarantee the accuracy of this information.

Commissioning Editor: Vijin BorichaAcquisition Editor: Shrilekha InaniContent Development Editor: Nithin George VargheseTechnical Editor: Komal KarneCopy Editor: Safis EditingProject Coordinator: Drashti PanchalProofreader: Safis EditingIndexer: Mariammal ChettiyarProduction Designer: Aparna Bhagat

First published: August 2017 Second edition: November 2018

Production reference: 2171019

Published by Packt Publishing Ltd. Livery Place 35 Livery Street Birmingham B3 2PB, UK.

ISBN 978-1-78961-526-5

www.packt.com

It would have not been possible to complete the book without the support of my best half, my wife, Haritha, and my cute little angel, Rithwika Sreeram.

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Contributors

About the author

Praveen Kumar Sreeram works as an Azure architect, trainer in a leading MNC. He has over 14 years of experience in the field of development, analysis, design, and delivery of applications, including custom web development using ASP.NET and MVC to building mobile apps using Xamarin for domains such as insurance, telecom, and wireless expense management. He has been recognized twice as the MVP by one of the leading social community websites, CSharpCorner. He is an avid blogger who writes about his learning at his personal blog, called Praveen Kumar Sreeram. His current focus is on analyzing business problems and providing technical solutions for various projects related to Microsoft Azure and .NET Core. His twitter ID is @PrawinSreeram.

First of all, my thanks go to the Packt Publishing team, including Shrilekha Inani, Nithin George Varghese, and Komal Karne. I would like to thank my grandma, Neelavatamma, dad, Kamalakar, and my mom, Seetha, for being in my life and giving me courage all the time. I would like to express my deepest gratitude to Bhagyamma (my grandmother), Kamala Kumar (my maternal uncle), his brothers, and rest of my family, who have supported me all the time.

About the reviewers

Kasam Shaikh, Microsoft Azure enthusiast, is a seasoned professional with a "Could be" attitude, with 10 years of industry experience working as a cloud architect with one of the leading IT companies in Mumbai, India. He is a certified Azure architect, and has been recognized as an MVP by a leading online community, and is also a global AI speaker. He has authored books on Azure Cognitive, Azure Bots, and Microsoft Bot Frameworks. He leads the Azure India (AZINDIA) community, the fastest growing online community for learning Azure. He is also a founder of the Dear Azure website.

First and foremost, I would like to thank the Almighty Allah, my family, and especially my better half, for motivating me throughout this process. I am highly grateful to Packt Publishing for believing in me and for giving me for this opportunity.

Michael Sync (Soe Htike) is a senior engineer working at Readify in Australia. He was an MVP (Microsoft Valuable Professional) for 7 years. He participated as a speaker, mentor, and helper at several community events. He is also an author and a tech book reviewer. He has published two books with Manning and has reviewed several books for a number of publishers. He has been working in the software industry for more than 16 years.

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Table of Contents

Title Page

Copyright and Credits

Azure Serverless Computing Cookbook Second Edition

Dedication

About Packt

Why subscribe?

Contributors

About the author

About the reviewers

Packt is searching for authors like you

Preface

Who this book is for

What this book covers

To get the most out of this book

Download the example code files

Download the color images

Conventions used

Sections

Getting ready

How to do it...

How it works...

There's more...

See also

Get in touch

Reviews

Developing Cloud Applications Using Function Triggers and Bindings

Introduction

Building a backend Web API using HTTP triggers

Getting ready

How to do it...

How it works...

See also

Persisting employee details using Azure Storage table output bindings

Getting ready

How to do it...

How it works...

Understanding storage connection

What is the Azure Table storage service?

Partition key and row key

There's more...

Saving the profile images to Queues using Queue output bindings

Getting ready

How to do it...

How it works...

Storing the image in Azure Blob Storage

Getting ready

How to do it...

How it works...

There's more...

Working with Notifications Using the SendGrid and Twilio Services

Introduction

Sending an email notification to the administrator of a website using the SendGrid service

Getting ready

Creating a SendGrid account

Generating an API key from the SendGrid portal

Configuring the SendGrid API key with the Azure Function app

How to do it...

Create Storage Queue binding to the HTTP Trigger

Creating Queue Trigger to process the message of the HTTP Trigger

Creating SendGrid output binding to the Queue Trigger

How it works...

There's more

Sending an email notification dynamically to the end user

Getting ready

How to do it...

Accepting the new email parameter in the RegisterUser function

Retrieving the UserProfile information in the SendNotifications trigger

How it works...

There's more...

Implementing email logging in Azure Blob Storage

How to do it...

How it works...

Modifying the email content to include an attachment

Getting ready

How to do it...

Customizing the log file name using IBinder interface

Adding an attachment to the email

Sending an SMS notification to the end user using the Twilio service

Getting ready

How to do it...

How it works...

Seamless Integration of Azure Functions with Azure Services

Introduction

Using Cognitive Services to locate faces in images

Getting ready

Creating a new Computer Vision API account

Configuring application settings

How to do it...

How it works...

There's more...

Azure SQL Database interactions using Azure Functions

Getting ready

How to do it...

How it works...

Monitoring tweets using Logic Apps and notifying users when a popular user tweets

Getting ready

How to do it...

Creating a new Logic App

Designing the Logic App with Twitter and Gmail connectors

Testing the Logic App functionality

How it works...

Integrating Logic Apps with serverless functions

Getting ready

How to do it...

There's more...

See also

Auditing Cosmos DB data using change feed triggers

Getting ready

Creating a new Cosmos DB account

Creating a new Cosmos DB collection

How to do it...

How it works...

There's more...

Understanding the Integrated Developer Experience of Visual Studio Tools

Introduction

Creating a function app using Visual Studio 2017

Getting ready

How to do it...

How it works...

There's more...

Debugging C# Azure Functions on a local staged environment using Visual Studio 2017

Getting ready

How to do it...

How it works...

There's more...

Connecting to the Azure Storage cloud from the local Visual Studio environment

Getting ready

How to do it...

How it works...

There's more...

Deploying the Azure Function app to Azure Cloud using Visual Studio

How to do it...

There's more...

Debugging a live C# Azure Function, hosted on the Microsoft Azure Cloud environment, using Visual Studio

Getting ready

How to do it...

Deploying Azure Functions in a container

Getting ready

Creating an ACR

How to do it...

Creating a Docker image for the function app

Pushing the Docker image to the ACR

Creating a new function app with Docker

How it works...

Exploring Testing Tools for the Validation of Azure Functions

Introduction

Testing Azure Functions

Getting ready

How to do it...

Testing HTTP triggers using Postman

Testing a Blob trigger using Microsoft Storage Explorer

Testing the Queue trigger using the Azure Management portal

There's more...

Testing an Azure Function on a staged environment using deployment slots

How to do it...

There's more...

Load testing Azure Functions using Azure DevOps

Getting ready

How to do it...

There's more...

See also

Creating and testing Azure Functions locally using the Azure CLI tools

Getting ready

How to do it...

Testing and validating Azure Function responsiveness using Application Insights

Getting ready

How to do it...

How it works...

There's more...

Developing unit tests for Azure Functions with HTTP triggers

Getting ready

How to do it...

Monitoring and Troubleshooting Azure Serverless Services

Introduction

Troubleshooting your Azure Functions

How to do it...

Viewing real-time application logs

Diagnosing the entire function app

There's more...

Integrating Azure Functions with Application Insights

Getting ready

How to do it...

How it works...

There's more...

Monitoring your Azure Functions

How to do it...

How it works...

Pushing custom telemetry details to Application Insights Analytics

Getting ready

How to do it...

Creating an Application Insights function

Configuring access keys

Integrating and testing an Application Insights query

Configuring the custom derived metric report

How it works...

Sending application telemetry details via email

Getting ready

How to do it...

How it works...

There's more...

See also

Integrating real-time Application Insights monitoring data with Power BI using Azure Functions

Getting ready

How to do it...

Configuring Power BI with a dashboard, a dataset, and the push URI

Creating an Azure Application Insights real-time Power BI – C# function

How it works...

There's more...

Developing Reliable Serverless Applications Using Durable Functions

Introduction

Configuring Durable Functions in the Azure Management portal

Getting ready

How to do it...

There's more...

Creating a Durable Function hello world app

Getting ready

How to do it...

Creating an HttpStart function in the Orchestrator client

Creating the Orchestrator function

Creating an activity function

How it works...

There's more...

Testing and troubleshooting Durable Functions

Getting ready

How to do it...

Implementing multithreaded reliable applications using Durable Functions

Getting ready

How to do it...

Creating the Orchestrator function

Creating a GetAllCustomers activity function

Creating a CreateBARCodeImagesPerCustomer activity function

How it works...

There's more...

Bulk Import of Data Using Azure Durable Functions and Cosmos DB

Introduction

Business problem

Durable serverless way of implementing an Excel import

Uploading employee data into Blob Storage

Getting ready

How to do it...

How it works...

There's more...

Creating a Blob trigger

Getting ready

How to do it...

There's more...

Creating the Durable Orchestrator and triggering it for each Excel import

How to do it...

How it works...

There's more...

Reading Excel data using activity functions

Getting ready

How to do it...

Reading data from Blob Storage

Reading Excel data from the stream

Creating the activity function

There's more...

Auto-scaling Cosmos DB throughput

Getting ready

How to do it...

There's more...

Bulk inserting data into Cosmos DB

How to do it...

There's more...

Implementing Best Practices for Azure Functions

Adding multiple messages to a queue using the IAsyncCollector function

Getting ready

How to do it...

How it works...

There's more...

Implementing defensive applications using Azure Functions and queue triggers

Getting ready

How to do it...

CreateQueueMessage – C# console application

Developing the Azure Function – queue trigger

Running tests using the console application

How it works...

There's more...

Handling massive ingress using Event Hubs for IoT and other similar scenarios

Getting ready

How to do it...

Creating an Azure Function event hub trigger

Developing a console application that simulates IoT data

Avoiding cold starts by warming the app at regular intervals

Getting ready

How to do it...

Creating an HTTP trigger

Creating a timer trigger

There's more...

See also

Enabling authorization for function apps

Getting ready

How to do it...

How it works...

There's more...

Controlling access to Azure Functions using function keys

How to do it...

Configuring the function key for each application

Configuring one host key for all the functions in a single function app

There's more...

Securing Azure Functions using Azure Active Directory

Getting ready

How to do it...

Configuring Azure AD to the function app

Registering the client app in Azure AD

Granting the client app access to the backend app

Testing the authentication functionality using a JWT token

Configuring the throttling of Azure Functions using API Management

Getting ready

How to do it...

Integrating Azure Functions with API Management

Configuring request throttling using inbound policies

Testing the rate limit inbound policy configuration

How it works...

Securely accessing SQL Database from Azure Functions using Managed Service Identity

Getting ready

How to do it...

Creating a function app using Visual Studio 2017 with V1 runtime

Creating a Logical SQL Server and a SQL Database

Enabling the managed service identity

Retrieving Managed Service Identity information

Allowing SQL Server access to the new Managed Identity Service

Executing the HTTP trigger and testing it

There's more...

See also

Shared code across Azure Functions using class libraries

How to do it...

How it works...

There's more...

Using strongly typed classes in Azure Functions

Getting ready

How to do it...

How it works...

There's more...

Configuring of Serverless Applications in the Production Environment

Introduction

Deploying Azure Functions using Run From Package

Getting ready

How to do it...

How it works...

There's more...

Deploying Azure Function using ARM templates

Getting ready

How to do it...

There's more...

Configuring custom domains to Azure Functions

Getting ready

How to do it...

Configuring a function app with an existing domain

Techniques to access Application Settings

Getting ready

How to do it...

Accessing Application Settings and connection strings in Azure Function code

Application setting – binding expressions

Creating and generating open API specifications using Swagger

Getting ready

How to do it...

Breaking down large APIs into small subsets of APIs using proxies

Getting ready

How to do it...

Creating microservices

Creating the gateway proxies

Testing proxy URLs

There's more...

See also

Moving configuration items from one environment to another using resources

Getting ready

How to do it...

Implementing and Deploying Continuous Integration Using Azure DevOps

Introduction

Prerequisites

Continuous integration – creating a build definition

Getting ready

How to do it...

How it works...

There's more...

Continuous integration – queuing a build and triggering it manually

Getting ready

How to do it...

Configuring and triggering an automated build

How to do it...

How it works...

There's more...

Continuous integration – executing unit test cases in the pipeline

How to do it...

There's more...

Creating a release definition

Getting ready

How to do it...

How it works...

There's more...

See also

Triggering the release automatically

Getting ready

How to do it...

How it works...

There's more...

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Preface

Microsoft provides a solution to easily run small segments of code in the cloud with Azure Functions. Azure Functions provides solutions for processing data, integrating systems, and building simple APIs and microservices.

The book starts with intermediate-level recipes on serverless computing, along with some use cases on the benefits and key features of Azure Functions. Then, we'll deep dive into the core aspects of Azure Functions, such as the services it provides, how you can develop and write Azure Functions, and how to monitor and troubleshoot Azure Functions.

Moving on, you'll get practical recipes on integrating DevOps with Azure Functions, and providing continuous deployment with Azure DevOps (formerly Visual Studio Team Services). The book also provides hands-on steps and tutorials based on real-world serverless use cases to guide you through configuring and setting up your serverless environments with ease. Finally, you'll see how to manage Azure Functions, providing enterprise-level security and compliance to your serverless code architecture.

You will also learn how to quickly build applications that are reliable and durable using Durable Functions, with an example of a very common real-time use case.

By the end of this book, you will have all the skills required to work with serverless code architectures, providing continuous delivery to your users.

Who this book is for

If you are a cloud administrator, architect, or developer who wants to build scalable systems and deploy serverless applications with Azure Functions, then the Azure Serverless Computing Cookbook is for you.

What this book covers

Chapter 1, Developing Cloud Applications Using Function Triggers and Bindings, goes through how the Azure Functions runtime provides templates that can be used to quickly integrate different Azure services for your application needs. It reduces all of the plumbing code so that you can focus on just your application logic. In this chapter, you will learn how to build web APIs and bindings related to Azure Storage Services.

Chapter 2, Working with Notifications Using the SendGrid and Twilio Services, deals with how communication is one of the most critical aspects of any business requirement. In this chapter, you will learn how easy it is to connect your business requirements written in Azure Functions with the most popular communication services, such as SendGrid (for email) and Twilio (for SMS).

Chapter 3, Seamless Integration of Azure Functions with Azure Services, discusses how Azure provides many connectors that you could leverage to integrate your business applications with other systems pretty easily. In this chapter, you will learn how to integrate Azure Functions with cognitive services and Logic Apps.

Chapter 4, Understanding the Integrated Developer Experience of Visual Studio Tools for Azure Functions, teaches you how to develop Azure Functions using Visual Studio, which provides many features, such as IntelliSense, local and remote debugging, and most of the regular development features.

Chapter 5, Exploring Testing Tools for the Validation of Azure Functions, helps you to understand different tools and processes that help you streamline your development and quality control processes. You will also learn how to create loads using Azure DevOps (formerly VSTS) load testing, and you'll look at how to monitor the performance of Azure Functions using the reports provided by Application Insights. Finally, you will also learn how to configure alerts that notify you when your apps are not responsive.

Chapter 6, Monitoring and Troubleshooting Azure Serverless Services, teaches you how to continuously monitor applications, analyze the performance, and review the logs to understand whether there are any issues that end users are facing. Azure provides us with multiple tools to achieve all the monitoring requirements, right from the development and maintenance stages of the application.

Chapter 7, Developing Reliable Serverless Applications Using Durable Functions, shows you how to develop long-running, stateful solutions in serverless environments using Durable Functions, which has advanced features that have been released as an extension to Azure Functions.

Chapter 8, Bulk Import of Data Using Azure Durable Functions and Cosmos DB, teaches you how to leverage Azure Durable Functions to read and import the data from the Blob storage and dump the data into Cosmos DB.

Chapter 9, Implementing Best Practices for Azure Functions, teaches a few of the best practices that you should follow in order to improve performance and security while working in Azure Functions.

Chapter 10, Configuring of Serverless Applications in the Production Environment, demonstrates how to deploy a function app in an efficient way and copy/move the configurations in a smarter way so as to avoid human error. You will also learn how to configure a custom domain that you could share with your customers or end users instead of the default domain that is created as part of provisioning the function app.

Chapter 11, Implementing and Deploying Continuous Integration Using Azure DevOps, helps you learn how to implement continuous integration and delivery of your Azure Functions code with the help of Visual Studio and Azure DevOps.

To get the most out of this book

Prior knowledge and hands-on experience with the core services of Microsoft Azure is required.

Download the example code files

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We also have other code bundles from our rich catalog of books and videos available athttps://github.com/PacktPublishing/. Check them out!

Download the color images

We also provide a PDF file that has color images of the screenshots/diagrams used in this book. You can download it here: https://www.packtpub.com/sites/default/files/downloads/9781789615265_ColorImages.pdf.

Conventions used

There are a number of text conventions used throughout this book.

CodeInText: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: "Mount the downloaded WebStorm-10*.dmg disk image file as another disk in your system."

A block of code is set as follows:

using System.Net;using Microsoft.AspNetCore.Mvc;using Microsoft.Extensions.Primitives;using Newtonsoft.Json;

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

using System.Net;using Microsoft.AspNetCore.Mvc;

using Microsoft.Extensions.Primitives;

using Newtonsoft.Json;

Any command-line input or output is written as follows:

docker tag functionsindocker cookbookregistry.azurecr.io/functionsindocker:v1

Bold: Indicates a new term, an important word, or words that you see on screen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: "During the installation, choose Azure development in the Workloads section."

Warnings or important notes appear like this.

Tips and tricks appear like this.

Sections

In this book, you will find several headings that appear frequently (Getting ready, How to do it..., How it works..., There's more..., and See also).

To give clear instructions on how to complete a recipe, use these sections as follows:

Getting ready

This section tells you what to expect in the recipe and describes how to set up any software or any preliminary settings required for the recipe.

How to do it...

This section contains the steps required to follow the recipe.

How it works...

This section usually consists of a detailed explanation of what happened in the previous section.

There's more...

This section consists of additional information about the recipe in order to help you increase your knowledge of it.

See also

This section provides helpful links to other useful information for the recipe.

Get in touch

Feedback from our readers is always welcome.

General feedback: If you have questions about any aspect of this book, mention the book title in the subject of your message and email us at [email protected].

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Developing Cloud Applications Using Function Triggers and Bindings

In this chapter, we will cover the following recipes:

Building a backend Web API using HTTP triggers

Persisting employee details using Azure Storage table output bindings

Saving the profile images to Queues using Queue output bindings

Storing the image in Azure Blob Storage

Introduction

Every software application needs backend components that are responsible for taking care of business logic and storing the data in some kind of storage, such as databases and filesystems. Each of these backend components could be developed using different technologies. Azure serverless technology also allows us to develop these backend APIs using Azure Functions.

Azure Functions provide many out-of-the-box templates that solve most common problems, such as connecting to storage, building Web APIs, and cropping images. In this chapter, we will learn how to use these built-in templates. Apart from learning about the concepts related to Azure serverless computing, we will also try to implement a solution to a basic domain problem of creating components, which is required for any organization who wants to manage internal employee information.

The following is a simple diagram that will help you understand what we will achieve in this chapter:

Building a backend Web API using HTTP triggers

We will use the Azure serverless architecture to build a Web API using HTTP triggers. These HTTP triggers can be consumed by any frontend application that is capable of making HTTP calls.

Getting ready

Let's start our journey of understanding Azure serverless computing using Azure Functions by creating a basic backend Web API that responds to HTTP requests:

Refer to

https://azure.microsoft.com/en-in/free/?&wt.mc_id=AID607363_SEM_8y6Q27AS

for creating a free Azure Account.

Visit

https://docs.microsoft.com/en-us/azure/azure-functions/functions-create-function-app-portal

to understand the step-by-step process of creating a function app, and

https://docs.microsoft.com/en-us/azure/azure-functions/functions-create-first-azure-function

to create a function. While creating a function, a Storage Account is also created for storing all the files. Remember the name of the Storage Account, as it will be used later in other chapters.

Once you have created the Function App, please go through the basic concepts of Triggers and Bindings, which are the core concepts of how Azure Functions work. I highly recommend that you to go through the

https://docs.microsoft.com/en-us/azure/azure-functions/functions-triggers-bindings

article before you proceed.

We will be using C# as the programming language throughout this book. Most of these functions are developed using the Azure Functions V2 runtime. However, there are a few recipes that are not yet supported in V2 runtime, which is mentioned in the respective recipes. Hopefully, by the time you read this book, Microsoft will have made those features available for V2 runtime as well.