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Oleg Nenashev, WireMock Inc.
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WireMock8s
Mocking your APIs in Kubernetes
June 29, 2023 - Basel
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> whoami
@oleg_nenashev
oleg-nenashev
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WireMock Inc.?
● Early stage startup
● WireMock creator is a
co-founder of the Inc.
● WireMock Cloud - SaaS for
end-to-end API mocking
● Soon: K8s Edition for
managed / on-premises
● // We are hiring ;-)
wiremock.io
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Disclaimer
● This is a talk about is
NOT about “VERSUS”
or “OR”
● There’s comparison
● Your mileage may vary
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Outline
● APIs in Cloud Native
● Microcks and WireMock
● Comparison
● HOWTO: WireMock in Cloud
Native app CI/CD
These slides
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Software ATE
the world
Source:developer.mercedes-benz.co
m/products/vehicle_status/details
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The new ecosystem is about APIs
GROWTH IN WEB APIS SINCE 2005
Over 90% of developers
use APIs.
Skyrocket growth of APIs
JANUARY
2006
JANUARY
2008
JANUARY
2010
JANUARY
2012
JANUARY
2014
JANUARY
2016
JANUARY
2018
MONTH
The growth over time of the Programmable Web API
API directory to more than 22,000 entries
22000
20000
18000
16000
14000
12000
10000
8000
6000
4000
2000
0
TOTAL API COUNT
Programmable Web
* Gartner Hype Cycle for APIs, 2022
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APIs? Not just REST!
● Any interface!
● Async interfaces too
● Binary interfaces too
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Open Standards
● Standard specifications for APIs
● Developer tools for the specification
● Ways to share specifications
between teams at early stages
● Tools for serving APIs based on
specifications
www.openapis.org
www.asyncapi.com
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Are there API Mocking tools?
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Of course!
https://twitter.com/dastbe/statu
s/1303858170155081728
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API Mocking Landscape
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en.wikipedia.org/wiki/Comparison_of_API_simulation_tools
Kubernetes Native Not so
Proprietary
Open Source
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https://microcks.io
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Microcks summary
● “Open source Kubernetes Native
tool for API Mocking and Testing”
● Kubernetes native
● Runs in Docker and OpenShift too
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https://microcks.io
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Congrats,
Microcks!
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Microcks in CI/CD
● You provision test APIs in CI/CD
on-demand
● Plugins and environment wrappers
● Contract testing for deployed APIs
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https://microcks.io
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https://wiremock.org
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Website: wiremock.org
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~4M MONTHLY DOWNLOADS OF THE JAVA LIBRARY
Downloads Over the Last 12 Months For com..github.tomakehurst
WireMock
5K STARS IN GITHUB AND GROWING
4.0K
3.0K
2.0K
1.0K
2012 2014 2016
Date
2018 2020 2022
Star history Align timeline
Start – history.com
Tomakehurst/wiremock
5.0K
3,036
Used by 3,036 Open
Source Projects
>46M
Pulls of WireMock
Docker Image
181
Contributors
>5M
Downloads a month
1.3k
Forks
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Key features
https://github.com/wiremock
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No content
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Not just a Java tool
github.com/wiremock/ecosystem
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WireMock8s
● wiremock/wiremock
● wiremock/wiremock-docker
● wiremock/helm-charts
● wiremock/grpc-wiremock
● wiremock/wiremock-testcontainers-go
Full demo will be here:
github.com/oleg-nenashev/wiremock8s
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gRPC Adapter for WireMock
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github.com/wiremock/wiremock-testcontainers-java
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Example
- JUnit 5
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Example
- Golang
https://github.com/oleg-nenashev/
wiremock-testcontainers-go/
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WireMock as a Proxy
Tests
Real API Provider
OR
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WireMock Proxy? Why?
● Record & Playback for Request sequences
● Reverse engineering of legacy undocumented APIs
● Emulating complex cases
○ Overriding particular responses
○ Emulating response sequences / Stateful behavior
○ Failure Injection
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Two tools.
What's the difference?
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Reminder
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Deployment / Project WireMock Microcks
“Baremetal” “External” projects * No
JVM Yes No
Docker / Container Runtimes Yes Yes
K8s / Helm Yes Yes
K8s Operator DIY Yes
K8s / Cloud Native Scaling DIY Yes
Testcontainers Yes DIY
SaaS WireMock Cloud N/A
Deployment
* Rust implementation, .NET Core, Quarkus Native, GraalVM
DIY - Do it yourself
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Operations / Cloud Native Experience
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Features / Project WireMock Microcks
CLI Yes Yes
Platform SDKs Yes Code-Generated
Scale to Zero DIY Yes (operator)
Horizontal scaling DIY Yes (operator)
OpenTelemetry integration No Yes
Configuration as Code Yes Yes
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Features
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Features / Project WireMock Microcks
Request Matching* Yes Yes
Response templating* Yes Yes
Record & Playback Yes No (playback is on the roadmap)
Stateful Behavior Yes No
Async Behavior DIY (extension) Yes
Fault Injection Yes DIY (hook)
Chaos Engineering Yes (WireMock Cloud) DIY (hook)
* WireMock is more powerful for
HTTP(s), but less - for gRPC
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Protocols
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Features / Project WireMock Microcks
HTTP / REST API * Yes Yes
HTTPs / SSL Yes Yes
gRPC Adapter Yes
GraphQL Yes (extension) Yes
Async API Adapter => AWS SNS/SQS, Kafka,
RabbitMQ, NATS, PubSub, MQTT
No Yes
CloudEvents PoC Yes (blog)
Websockets No Yes
* WireMock is more powerful for
HTTP(s), but less - for gRPC
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Add more Chaos… Engineering!
* Available in WireMock Cloud
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Developer Experience
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Features / Project WireMock Microcks
Web UI WireMock UI*, WireMock.NET,
WireMock Cloud
Yes
Editor / IDE integrations WireMocha for IDEA, VSCode
plugins, OpenAPI Tooling
Async API and OpenAPI tooling
Reusable Templates Repo Yes Yes (Just Starting)
REST API and OpenAPI Reverse Engineering WireMock Cloud No
* Unofficial
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There’s no silver bullet
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Comparison - TL;DR
● Microcks is cloud native and K8s native
● Microcks supports more protocols OOTB
● Microcks implements Async API events
● WireMock can be used in a cloud native way
● WireMock is more powerful as Mocking tool
○ Better form matching
○ Record & Playback capabilities
○ Stateful behavior
● WireMock embeds in Unit/Integration tests
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WireMock in K8s App CI/CD?
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Testcontainers + WireMock
(Docker engine is needed)
My approach -
Choosing
Deployment
I. Tests inside
Java / JVM?
II. Other stack?
Use WireMock classic
(WireMock Java)
III. Single team /
workspace?
IV. Bigger
setups?
Use WireMock Standalone
With Helm / Crossplane / etc.
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Demo time!
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Repeat after me?
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● WireMock Cloud - Free Tier available, use it
○ https://www.wiremock.io/product
● Demo repository: TODO
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WireMock8s. What’s next?
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Public Roadmap
https://github.com/orgs/wiremock/projects/4
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WireMock8s initiatives
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● Testcontainers Go module 1.0
● Helm Chart 1.0
● Better extensions support
● Better observability / sub-events
● Native gRPC and CloudEvents mocking
● (?) OpenFeature adoption
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WireMock Cloud. K8s Edition
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Coming Soon! Subscribe -
https://share-eu1.hsforms.com/1YS
KnSP93Tsig1JoO3lXSawfbdiq
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Takeaways
● API Mocking/Abstraction are great
● There is no silver bullet
● There are tools for Kubernetes!
● If you need a cloud native tool OOTB - Microcks
● WireMock can be made cloud native too
● WireMock Cloud if you need SaaS
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References
WireMock
● Website: wiremock.org
● Docs: wiremock.org/docs
● WireMock on K8s: wiremock.org/docs/solutions/kubernetes/
● WireMock Cloud: www.wiremock.io/product
● WireMock and Testcontainers
Microcks
● Website: microcks.io
● Docs: microcks.io/documentation
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It’s [always] a great time to contribute!
wiremock.org/participate
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THANK YOU
Contacts:
E-mail: [email protected]
GitHub: oleg-nenashev
Twitter: @oleg_nenashev
QUESTIONS?