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Home > Cloud & Networking > Design Patterns > Serverless Design Patterns and Best Practices
Serverless Design Patterns and Best Practices
Serverless Design Patterns and Best Practices

Serverless Design Patterns and Best Practices: Build, secure, and deploy enterprise ready serverless applications with AWS to improve developer productivity

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Serverless Design Patterns and Best Practices

A Three-Tier Web Application Using REST

It should be safe to say that the vast majority of developers know what REST is. A three-tier web application consists of the following:

  • Presentation layer (HTML and CSS)
  • Business logic layer (application code)
  • Data layer (Relational Database Management System or another type of data store)

The three-tier web application is extremely well known and one of the most common designs on the web today. Readers are likely familiar with this design when thinking about a web application's static content (that is, HTML, JavaScript, and CSS) which are served from a content delivery network (CDN), which talks to a RESTful API hosted on a web server, which, in turn, talks to a database.

In this chapter, we will go through the process of building a three-tier web application using HTML, JavaScript, and CSS for our presentation layer, a REST...

Serverless tooling

Since this is the very first chapter that has application code and working examples, it's important to talk through some of the tooling and systems to set the stage for this and subsequent chapters. In this and the following chapters on web applications, our toolchain will consist of services from AWS:

  • AWS API Gateway as the HTTP proxy
  • AWS Lambda for computing
  • AWS S3 for static file serving
  • AWS CloudFront for the CDN
  • AWS RDS for RDBMS management
  • AWS Certificate Manager (ACM) for free certificate management

While AWS is the dominant player in the Platform as a service (PaaS) ecosystem, it is by no means the only choice. While reading this chapter and others in this book, remember that the patterns presented should apply to any cloud provider, albeit sometimes with a certain degree of adaptation.

You may be questioning the reasoning...

System architecture

At first glance, a three-tier web application using a REST API can be an easy topic and pattern. After all, there are only three layers, which are responsible for very discrete tasks, and the final result is just a web application after all. However, there are many nuances and areas for tweaking with any web application. Serverless web applications are no different. This chapter will attempt to cover as many areas as possible, but it's impossible to include every possible configuration or design option.

Seeing as we are responsible software designers, let's sketch out our architecture at a high level and drill down into more detail as we work through the different layers:

This diagram should look familiar as it's the backbone of many client-server web applications out there today. Let's walk through the different layers, going from the...

Logic layer

Application code is likely the area of most interest and the layer that has the most changes from a traditional web application hosted on a managed server, so let's start with that.

Application code and function layout

Let's differentiate two classifications of our organization for the logical layer:

  • Organization of the Lambda functions themselves, within AWS
  • Organization of the application code

Lambda functions are the unit of work in Lambda and other FaaS providers (for simplicity and clarity, I will refer to these as Lambda functions from here on out). A single Lambda function may be updated or deployed in isolation without affecting other Lambda functions.

...

Presentation layer

Presentation layers are not necessarily the most exciting area but, in reality, they are the entry point for your entire web application, and you should think through the details carefully. Naive deployments of HTML, CSS, and JavaScript files may result in slow load times, which has a noticeable impact on user experience.

When building serverless systems on top of AWS, there are a few different services that enable us to host static assets quite easily. Other PaaS systems have similar offerings, although there may not be a one-to-one comparison with all of the AWS services.

File storage with S3

Any frontend assets need a filesystem as a home. In this case, the natural choice is AWS Simple Storage Service...

Data layer

It's safe to say that most web applications today have some data store, whether it's a relational database (PostgreSQL, MySQL, SQLServer, and so on), a non-relational database (MongoDB, Redis, Cassandra, and so on), or even static file storage (S3, OS filesystem, and so on).

AWS RDS service will manage a PostgreSQL database for our coffee cupping application. RDS offers different RDBMS choices, most notably PostgreSQL, MySQL, Oracle, and SQLServer. There are other choices, and I encourage you to take a look at the various offerings. For this exercise, we'll be using a standard PostgreSQL database hosted on RDS. Many configuration options come with RDS, which we won't cover. Just know that it's possible and quite simple to run, configure, and manage a high-availability RDBMS instance using RDS. Other PaaS providers offer similar services for...

Writing our logic layer

Since we've covered the overall design and different layers, let's get down to the implementation of our application code.

Application entrypoint

Every application, web or otherwise, needs a primary entry point. In our case, we'll use handler.py to begin application execution when a Lambda function is invoked. Serverless Framework applications will generate a handler.py file when you bootstrap a new project, so this pattern should be familiar to anyone who has used Serverless before. If you've never worked with the Serverless Framework, what follows will be a thorough introduction:

import sys

from pathlib import Path

# Munge our sys path so libs can be found
CWD = Path(__file__...

Deploying the REST API

Now the fun part, we'll deploy our REST API using the Serverless Framework. At this point, we have not discussed the various configuration options when implementing serverless architectures on AWS. I'll cover different possibilities, and our particular configuration, later on in this chapter.

My pattern of using Docker as a build and deployment tool makes this process a bit easier. You are not required to do this, and there are likely other ways to make the process even simpler.

We will do all package building and deployment from inside a running Docker container, which I start and enter with the following Makefile target:

brianz@gold(master=)$ ENV=dev make shell

This equates to the following Docker command:

docker run --rm -it \
        -v `pwd`:/code \
        --env ENV=$(ENV) \
        --env-file envs/$2 \
        --name=coffee-cupping-$(ENV) \
...

Serverless tooling

Since this is the very first chapter that has application code and working examples, it's important to talk through some of the tooling and systems to set the stage for this and subsequent chapters. In this and the following chapters on web applications, our toolchain will consist of services from AWS:

  • AWS API Gateway as the HTTP proxy
  • AWS Lambda for computing
  • AWS S3 for static file serving
  • AWS CloudFront for the CDN
  • AWS RDS for RDBMS management
  • AWS Certificate Manager (ACM) for free certificate management

While AWS is the dominant player in the Platform as a service (PaaS) ecosystem, it is by no means the only choice. While reading this chapter and others in this book, remember that the patterns presented should apply to any cloud provider, albeit sometimes with a certain degree of adaptation.

You may be questioning the reasoning behind discussing other services such as S3 and RDS. Very often, perhaps usually, when people say serverless they are talking about functions as a service...

System architecture

At first glance, a three-tier web application using a REST API can be an easy topic and pattern. After all, there are only three layers, which are responsible for very discrete tasks, and the final result is just a web application after all. However, there are many nuances and areas for tweaking with any web application. Serverless web applications are no different. This chapter will attempt to cover as many areas as possible, but it's impossible to include every possible configuration or design option.

Seeing as we are responsible software designers, let's sketch out our architecture at a high level and drill down into more detail as we work through the different layers:

This diagram should look familiar as it's the backbone of many client-server web applications out there today. Let's walk through the different layers, going from the top down. After discussing these layers at a high level, we'll get into the implementation details with a real-world example.

You can find...

Logic layer

Application code is likely the area of most interest and the layer that has the most changes from a traditional web application hosted on a managed server, so let's start with that.

Application code and function layout

Let's differentiate two classifications of our organization for the logical layer:

  • Organization of the Lambda functions themselves, within AWS
  • Organization of the application code

Lambda functions are the unit of work in Lambda and other FaaS providers (for simplicity and clarity, I will refer to these as Lambda functions from here on out). A single Lambda function may be updated or deployed in isolation without affecting other Lambda functions.

Organization of the Lambda functions

With a REST API, there are a few options you have as to how each API endpoint maps to a function. The primary options in this design are whether to have a single Lambda function handle a single HTTP verb/resource combination, or whether to have a single lambda function handle all HTTP verbs...

Presentation layer

Presentation layers are not necessarily the most exciting area but, in reality, they are the entry point for your entire web application, and you should think through the details carefully. Naive deployments of HTML, CSS, and JavaScript files may result in slow load times, which has a noticeable impact on user experience.

When building serverless systems on top of AWS, there are a few different services that enable us to host static assets quite easily. Other PaaS systems have similar offerings, although there may not be a one-to-one comparison with all of the AWS services.

File storage with S3

Any frontend assets need a filesystem as a home. In this case, the natural choice is AWS Simple Storage Service (S3), which is Amazon's high durability object storage service. S3 advertises 99.999999999% durability, so it's safe to say our files will be available when we need them. While it's possible to serve content from S3 as a website on a custom domain, it's not the best choice...

Data layer

It's safe to say that most web applications today have some data store, whether it's a relational database (PostgreSQL, MySQL, SQLServer, and so on), a non-relational database (MongoDB, Redis, Cassandra, and so on), or even static file storage (S3, OS filesystem, and so on).

AWS RDS service will manage aPostgreSQL database for our coffee cupping application. RDS offers different RDBMS choices, most notably PostgreSQL, MySQL, Oracle, and SQLServer. There are other choices, and I encourage you to take a look at the various offerings. For this exercise, we'll be using a standard PostgreSQL database hosted on RDS. Many configuration options come with RDS, which we won't cover. Just know that it's possible and quite simple to run, configure, and manage a high-availability RDBMS instance using RDS. Other PaaS providers offer similar services for relational databases.

Writing our logic layer

Since we've covered the overall design and different layers, let's get down to the implementation of our application code.

Application entrypoint

Every application, web or otherwise, needs a primary entry point. In our case, we'll use handler.py to begin application execution when a Lambda function is invoked. Serverless Framework applications will generate a handler.py file when you bootstrap a new project, so this pattern should be familiar to anyone who has used Serverless before. If you've never worked with the Serverless Framework, what follows will be a thorough introduction:

import sys

from pathlib import Path

# Munge our sys path so libs can be found
CWD = Path(__file__).resolve().cwd() / 'lib'
sys.path.insert(0, str(CWD))

import simplejson as json

from cupping.handlers.session import (
        handle_session,
        handle_session_detail,
)

from cupping.exceptions import Http404

CORS_HEADERS = {
        'Access-Control-Allow-Origin': '*',
        'Access...
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Key benefits

  • Learn the details of popular software patterns and how they are applied to serverless applications
  • Understand key concepts and components in serverless designs
  • Walk away with a thorough understanding of architecting serverless applications

Description

Serverless applications handle many problems that developers face when running systems and servers. The serverless pay-per-invocation model can also result in drastic cost savings, contributing to its popularity. While it's simple to create a basic serverless application, it's critical to structure your software correctly to ensure it continues to succeed as it grows. Serverless Design Patterns and Best Practices presents patterns that can be adapted to run in a serverless environment. You will learn how to develop applications that are scalable, fault tolerant, and well-tested. The book begins with an introduction to the different design pattern categories available for serverless applications. You will learn thetrade-offs between GraphQL and REST and how they fare regarding overall application design in a serverless ecosystem. The book will also show you how to migrate an existing API to a serverless backend using AWS API Gateway. You will learn how to build event-driven applications using queuing and streaming systems, such as AWS Simple Queuing Service (SQS) and AWS Kinesis. Patterns for data-intensive serverless application are also explained, including the lambda architecture and MapReduce. This book will equip you with the knowledge and skills you need to develop scalable and resilient serverless applications confidently.

Who is this book for?

If you're a software architect, engineer, or someone who wants to build serverless applications, which are non-trivial in complexity and scope, then this book is for you. Basic knowledge of programming and serverless computing concepts are assumed.

What you will learn

  • • Comprehend the popular design patterns currently being used with serverless architectures
  • • Understand the various design options and corresponding implementations for serverless web application APIs
  • • Learn multiple patterns for data-intensive serverless systems and pipelines, including MapReduce and Lambda Architecture
  • • Learn how to leverage hosted databases, queues, streams, storage services, and notification services
  • • Understand error handling and system monitoring in a serverless architecture a serverless architecture
  • • Learn how to set up a serverless application for continuous integration, continuous
  • delivery, and continuous deployment
Estimated delivery fee Deliver to Germany

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Product Details

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Publication date, Length, Edition, Language, ISBN-13
Publication date : Apr 12, 2018
Length: 260 pages
Edition : 1st
Language : English
ISBN-13 : 9781788620642
Category :
Cloud & Networking
Languages :
JavaScript
Concepts :
Design Patterns
Tools :
AWS

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Product feature icon Paperback book shipped to your preferred address
Product feature icon Redeem a companion digital copy on all Print orders
Product feature icon Access this title in our online reader with advanced features
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OR

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Product Details

Publication date : Apr 12, 2018
Length: 260 pages
Edition : 1st
Language : English
ISBN-13 : 9781788620642
Category :
Cloud & Networking
Languages :
JavaScript
Concepts :
Design Patterns
Tools :
AWS

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Table of Contents

11 Chapters
Introduction Chevron down icon Chevron up icon
Introduction
What is serverless computing?
Design patterns
When to use serverless
Classes of serverless pattern
Serverless frameworks
Summary
A Three-Tier Web Application Using REST Chevron down icon Chevron up icon
A Three-Tier Web Application Using REST
Serverless tooling
System architecture
Logic layer
Presentation layer
Data layer
Writing our logic layer
Deploying the REST API
Deploying the Postgres database
Setting up static assets
Viewing the deployed web application
Running tests
Iteration and deployment
Summary
A Three-Tier Web Application Pattern with GraphQL Chevron down icon Chevron up icon
A Three-Tier Web Application Pattern with GraphQL
Introduction to GraphQL
System architecture
Logic layer
Presentation layer
Writing the logic layer
Deployment
Viewing the deployed application
Iteration and deployment
Summary
Integrating Legacy APIs with the Proxy Pattern Chevron down icon Chevron up icon
Integrating Legacy APIs with the Proxy Pattern
AWS API Gateway introduction
Simple proxy to a legacy API
Transforming responses from a modern API
Complex integration using a Lambda function
Migration techniques
Summary
Scaling Out with the Fan-Out Pattern Chevron down icon Chevron up icon
Scaling Out with the Fan-Out Pattern
System architecture
Resizing images in parallel
Alternate Implementations
Summary
Asynchronous Processing with the Messaging Pattern Chevron down icon Chevron up icon
Asynchronous Processing with the Messaging Pattern
Basics of queuing systems
Asynchronous processing of Twitter streams
Alternate Implementations
Summary
Data Processing Using the Lambda Pattern Chevron down icon Chevron up icon
Data Processing Using the Lambda Pattern
Introducing the lambda architecture
Lambda serverless architecture
Processing cryptocurrency prices using lambda architecture
Results
Summary
The MapReduce Pattern Chevron down icon Chevron up icon
The MapReduce Pattern
Introduction to MapReduce
MapReduce serverless architecture
Processing Enron emails with serverless MapReduce
Understanding the limitations of serverless MapReduce
Exploring alternate implementations
Summary
Deployment and CI/CD Patterns Chevron down icon Chevron up icon
Deployment and CI/CD Patterns
Introduction to CI/CD
Setting up unit tests
Setting up CI with CircleCI
Setting up CD and deployments with CircleCI
Summary
Error Handling and Best Practices Chevron down icon Chevron up icon
Error Handling and Best Practices
Error tracking
Logging
Cold starts
Local development and testing
Managing different environments
Securing sensitive configuration
Trimming AWS Lambda versions
Summary
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Customer reviews

Rating distribution
Full star icon Full star icon Full star icon Full star icon Full star icon 5
(1 Ratings)
5 star 100%
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Just Some Guy Jun 02, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
This is a great book filled with solid info, clearly explained with detailed examples. My only complaint is that I expected it to be Node-centric but almost all of the code samples are in Python. There's only 1 Node chapter. The patterns still apply if you know both and can mentally map how you'd do it in Node, but I wish the summary made that clear going in.
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About the author

Profile icon Zambrano
Zambrano
Brian Zambrano is a software engineer and architect with a background cloud-based SAAS application architecture, design, and scalability. Brian has been working with AWS consistently since 2009. For the past several years, he has focused on cloud architecture with AWS using serverless technologies, microservices, containers, and the vast array of AWS services. Brian was born and bred in the San Francisco Bay Area and currently resides in Fort Collins, CO with his wife and twin boys.
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Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela
What is custom duty/charge? Chevron down icon Chevron up icon

Customs duty are charges levied on goods when they cross international borders. It is a tax that is imposed on imported goods. These duties are charged by special authorities and bodies created by local governments and are meant to protect local industries, economies, and businesses.

Do I have to pay customs charges for the print book order? Chevron down icon Chevron up icon

The orders shipped to the countries that are listed under EU27 will not bear custom charges. They are paid by Packt as part of the order.

List of EU27 countries: www.gov.uk/eu-eea:

A custom duty or localized taxes may be applicable on the shipment and would be charged by the recipient country outside of the EU27 which should be paid by the customer and these duties are not included in the shipping charges been charged on the order.

How do I know my custom duty charges? Chevron down icon Chevron up icon

The amount of duty payable varies greatly depending on the imported goods, the country of origin and several other factors like the total invoice amount or dimensions like weight, and other such criteria applicable in your country.

For example:

  • If you live in Mexico, and the declared value of your ordered items is over $ 50, for you to receive a package, you will have to pay additional import tax of 19% which will be $ 9.50 to the courier service.
  • Whereas if you live in Turkey, and the declared value of your ordered items is over € 22, for you to receive a package, you will have to pay additional import tax of 18% which will be € 3.96 to the courier service.
How can I cancel my order? Chevron down icon Chevron up icon

Cancellation Policy for Published Printed Books:

You can cancel any order within 1 hour of placing the order. Simply contact customercare@packt.com with your order details or payment transaction id. If your order has already started the shipment process, we will do our best to stop it. However, if it is already on the way to you then when you receive it, you can contact us at customercare@packt.com using the returns and refund process.

Please understand that Packt Publishing cannot provide refunds or cancel any order except for the cases described in our Return Policy (i.e. Packt Publishing agrees to replace your printed book because it arrives damaged or material defect in book), Packt Publishing will not accept returns.

What is your returns and refunds policy? Chevron down icon Chevron up icon

Return Policy:

We want you to be happy with your purchase from Packtpub.com. We will not hassle you with returning print books to us. If the print book you receive from us is incorrect, damaged, doesn't work or is unacceptably late, please contact Customer Relations Team on customercare@packt.com with the order number and issue details as explained below:

  1. If you ordered (eBook, Video or Print Book) incorrectly or accidentally, please contact Customer Relations Team on customercare@packt.com within one hour of placing the order and we will replace/refund you the item cost.
  2. Sadly, if your eBook or Video file is faulty or a fault occurs during the eBook or Video being made available to you, i.e. during download then you should contact Customer Relations Team within 14 days of purchase on customercare@packt.com who will be able to resolve this issue for you.
  3. You will have a choice of replacement or refund of the problem items.(damaged, defective or incorrect)
  4. Once Customer Care Team confirms that you will be refunded, you should receive the refund within 10 to 12 working days.
  5. If you are only requesting a refund of one book from a multiple order, then we will refund you the appropriate single item.
  6. Where the items were shipped under a free shipping offer, there will be no shipping costs to refund.

On the off chance your printed book arrives damaged, with book material defect, contact our Customer Relation Team on customercare@packt.com within 14 days of receipt of the book with appropriate evidence of damage and we will work with you to secure a replacement copy, if necessary. Please note that each printed book you order from us is individually made by Packt's professional book-printing partner which is on a print-on-demand basis.

What tax is charged? Chevron down icon Chevron up icon

Currently, no tax is charged on the purchase of any print book (subject to change based on the laws and regulations). A localized VAT fee is charged only to our European and UK customers on eBooks, Video and subscriptions that they buy. GST is charged to Indian customers for eBooks and video purchases.

What payment methods can I use? Chevron down icon Chevron up icon

You can pay with the following card types:

  1. Visa Debit
  2. Visa Credit
  3. MasterCard
  4. PayPal
What is the delivery time and cost of print books? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela