Python Microservices Development by Ziadé, Tarek -- Read -- Imperial Library of Trantor

Index

Title Page Copyright

Python Microservices Development

Credits About the Author About the Reviewer www.PacktPub.com

Why subscribe?

Customer Feedback Preface

What this book covers What you need for this book Who this book is for Conventions Reader feedback Customer support

Downloading the example code Errata Piracy Questions

Understanding Microservices

Origins of Service-Oriented Architecture The monolithic approach The microservice approach Microservice benefits

Separation of concerns Smaller projects Scaling and deployment

Microservices pitfalls

Illogical splitting More network interactions Data storing and sharing Compatibility issues Testing

Implementing microservices with Python

The WSGI standard Greenlet and Gevent Twisted and Tornado asyncio Language performances

Summary

Discovering Flask

Which Python? How Flask handles requests

Routing

Variables and converters The url_for function

Request Response

Flask built-in features

The session object Globals Signals Extensions and middlewares Templates Configuration Blueprints Error handling and debugging

Custom error handler The debug mode

A microservice skeleton Summary

Coding, Testing, and Documenting - the Virtuous Cycle

Different kinds of tests

Unit tests Functional tests Integration tests Load tests End-to-end tests

Using WebTest Using pytest and Tox Developer documentation Continuous Integration

Travis-CI ReadTheDocs Coveralls

Summary

Designing Runnerly

The Runnerly application

User stories

Monolithic design

Model View and Template Background tasks

Strava token

Authentication and authorization Putting together the monolithic design

Splitting the monolith Data Service Using Open API 2.0 More splitting Summary

Interacting with Other Services

Synchronous calls

Using Session in a Flask app Connection pooling HTTP cache headers Improving data transfer

GZIP compression Binary payloads

Putting it together

Asynchronous calls

Task queues Topic queues Publish/subscribe RPC over AMQP Putting it together

Testing

Mocking synchronous calls Mocking asynchronous calls

Mocking Celery Mocking other asynchronous calls

Summary

Monitoring Your Services

Centralizing logs

Setting up Graylog Sending logs to Graylog Adding extra fields

Performance metrics

System metrics Code metrics Web server metrics

Summary

Securing Your Services

The OAuth2 protocol Token-based authentication

The JWT standard PyJWT X.509 certificate-based authentication The TokenDealer microservice

The POST/oauth/token implementation

Using TokenDealer

Web application firewall

OpenResty - Lua and nginx

Rate and concurrency limiting Other OpenResty features

Securing your code

Asserting incoming data Limiting your application scope Using Bandit linter

Bringing It All Together

Building a ReactJS dashboard

The JSX syntax React components

ReactJS and Flask

Using Bower, npm, and Babel Cross-origin resource sharing

Authentication and authorization

Interacting with Data Service Getting the Strava token JavaScript authentication

Packaging and Running Runnerly

The packaging toolchain

A few definitions Packaging

The setup.py file The requirements.txt file The MANIFEST.in file

Versioning Releasing Distributing

Running all microservices Process management Summary

Containerized Services

What is Docker? Docker 101 Running Flask in Docker The full stack - OpenResty, Circus and Flask

OpenResty Circus

Docker-based deployments

Docker Compose Introduction to Clustering and Provisioning

Summary

Deploying on AWS

AWS overview Routing - Route53, ELB, and AutoScaling Execution - EC2 and Lambda Storage - EBS, S3, RDS, ElasticCache, and CloudFront

Messaging - SES, SQS, and SNS

Simple Email Service (SES) Simple Queue Service (SQS) Simple Notification Service (SNS)

Provisioning and deployment - CloudFormation and ECS

Deploying on AWS - the basics

Setting up your AWS account Deploying on EC2 with CoreOS

Deploying with ECS Route53 Summary

What Next?

Iterators and generators Coroutines The asyncio library The aiohttp framework Sanic Asynchronous versus synchronous

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