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Consumer Driven Contracts and Your Microservice Architecture
- 1. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Consumer Driven Contracts and Your Microservice Architecture By Marcin Grzejszczak @mgrzejszczak
- 2. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ About me • Spring Cloud developer • Working mostly on Spring Cloud Sleuth and Spring Cloud Contract • Automation freak Twitter: @mgrzejszczak Blog: http://toomuchcoding.com
- 3. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Agenda • Introduction • Demo • Summary
- 4. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Introduction • Producer – service that exposes an API • Consumer – service that consumes the API of the producer • Contract – agreement between producer and consumer how the API will look like • Consumer Driven Contracts – approach where the consumer drives the changes of the API of the producer
- 5. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ What are we going to code? • Consumer – service that gets beer requests – has to ask another service if the client can get the beer • Producer – service that checks if the client is old enough to buy beer • Feature – if the user is too young - the beer will not be sold – otherwise the beer will be granted
- 6. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ DEMO
- 7. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Summary With Spring Cloud Contract and Consumer Driven Contracts: • we’ve created an API that suits the consumer and the producer • expectations were defined by readable contracts that were tested against the producer • producer stubs can be reused by consumers • starting and setting stubs is fully automated
- 8. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Summary - Consumer flow 1 Consumer • starts TDD - writes the test for the feature • clones producer code to change the API locally • in the cloned producer code converts contracts into stubs and installs them locally • in the consumer code turns Stub Runner to offline mode • configures Stub Runner to download stubs of the producer • red - green - refactor on the API and tests • repeats the process until the tests are green and API acceptable • files a PR to the producer with the contract proposal
- 9. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Summary - Producer flow Producer • takes over the PR • writes the missing implementation that will make the autogenerated tests pass • merges PR and deploys the JARs with the app and the stubs
- 10. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Summary - Consumer flow 2 Consumer • switches off the Stub Runner’s offline mode once the producer uploads the stubs • configure Stub Runner by providing the URL to a repo with stubs • will have its test broken if the producer makes any breaking changes of the API
- 11. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Why use Spring Cloud Contract Verifier? • Possibility to do CDC with messaging • Clear and easy to use, statically typed DSL • Automatic generation of tests from the defined Contract • Stub Runner functionality - the stubs are automatically downloaded at runtime from Nexus / Artifactory • Spring Cloud integration - no discovery service is needed for integration tests
- 12. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ QUESTIONS?
- 13. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ ● http://martinfowler.com/articles/consumerDrivenContracts.html - article about Consumer Driven Contracts by Ian Robinson ● https://github.com/marcingrzejszczak/springone-cdc-client - code for the client side of the presented example ● https://github.com/marcingrzejszczak/springone-cdc-server - code for the server side of the presented example ● https://cloud.spring.io/spring-cloud-contract/spring-cloud-contract.html - documentation of the Spring Cloud Contract project Thank you!
- 14. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Learn More. Stay Connected. https://gitter.im/spring-cloud/spring-cloud-contract @springcentral spring.io/blog @pivotal pivotal.io/blog @pivotalcf http://engineering.pivotal.io