End to end testing a web application with Clojure

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End to end performance
testing with Clojure

About me
Gerard Klijs
● @GKlijs
● https://github.com/gklijs
● Java developer with
● Used Kafka several times
● Author of
s...

Contents
● Demo
● Test setup
● Used libraries
● Results comparing linger.ms 0 and 100
● Questions

Bank simulation with end-to-end performance test

Overview of the whole system
Every yellow component will be explained in details, and are all but the command
handler only...

Code example start consuming

Code example producer

Topology
Common dependency of the other parts.
Several functions:
● One way to set the logging for all components.
● All c...

Synchronizer
Makes sure both the correct topics and schema’s are set.
Checks if it’s possible to set the replication facto...

Heartbeat
Just a simple producer for easy debugging.
Used a simple message with just a long value.
Exposes and nrepl. A nr...

Command generator
Consumes the heartbeats and generates a command for each received heartbeat.
This will be ConfirmAccount...

Using seancorfield/next.jdbc for PostgreSQL

Command handler
Handles the different kinds of command.
● AccountCreationCommand: generates a new iban, if it not already ...

GraphQL-endpoint

GraphQL-endpoint
Exposes a GraphQL endpoint to make it easy to issue commands and get the
results back in the frontend. Al...

GraphQL subscriptions using Lacinia-pedestal

Frontend

Frontend
The frontend is build on several parts that all end up in a NginX container to be
served.
● The javascript part i...

Running a test
When the test is run it will do several kind of transaction that either increase or
lower the money on the ...

Test frontend with etaoin using chrome

Using lispyclouds/clj-docker-client for docker

Output a test
The generated files can be compared to other files to generate graphs.
All the data is combined, and for eac...

Using kixi/stats to prepare the data

Using metasoarous/oz to display using vega

Example test, difference linger.ms 0 vs 100
linger.ms is an important setting of the kafka producer. Default is 0 for the ...

Questions? Code available at open-bank-mark

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