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Graph ql subscriptions on the jvm
- 1. www.openweb.nl GraphQL subscriptions on the JVM Reactive streaming data to clients using GraphQL
- 2. www.openweb.nl Gerard Klijs 3.5 years 8 years 4.5 years ago 2 years ago 4 years ago
- 3. www.openweb.nl Overview ▰ Short introduction GraphQL ▰ GraphQL over websockets ▰ Demo project setup ▰ 4 GraphQL JVM servers ▰ Running tests ▰ Demo
- 5. www.openweb.nl GraphQL compared to OpenAPI - similarities Fully typed Language agnostic Open source foundation extensive tooling available typically over http
- 6. www.openweb.nl GraphQL compared to OpenAPI - differences One schema Custom scalar query, mutation and subscription Client focussed Introspection Multiple documents Custom format of String get, put, post, delete, options, head, patch, trace Server focussed Documentation tooling / Swagger UI
- 7. www.openweb.nl GraphQL over websockets Description of protocol: https://github.com/apollographql/subscriptions- transport-ws/blob/master/PROTOCOL.md This protocol is commonly used as a reference, but it’s not always clear. But most of the clients and servers supporting subscriptions, implement most of it..
- 8. www.openweb.nl GraphQL over websockets for JVM server
- 10. www.openweb.nl Demo project: topics "commands" "account_creation_feedback" "money_transfer_feedback" "balance_changed" [24 3 [:ConfirmAccountCreation :ConfirmMoneyTransfer] {:retention.ms -1}] [24 3 [:AccountCreationConfirmed :AccountCreationFailed] {:retention.ms -1}] [24 3 [:MoneyTransferConfirmed :MoneyTransferFailed] {:retention.ms -1}] [24 3 [:BalanceChanged] {:retention.ms -1}]
- 11. www.openweb.nl Account creation: component overview
- 12. www.openweb.nl Money transfer: component overview
- 13. www.openweb.nl Transaction service: component overview
- 14. www.openweb.nl 4 implementations ▰ lacinia-pedestal ▰ graphql-spring-boot-starter ▰ graphql-kotlin ▰ micronaut-graphql
- 15. www.openweb.nl lacinia-pedestal source: https://github.com/walmart labs/lacinia-pedestal engine: lacinia only subscription over ws: no schema first Latest version has trouble running when aot compiled. Maintained by Walmart Labs. Used in production to fix airplanes, https://www.youtube.com/ watch?v=v9_DYj1fPbs
- 16. www.openweb.nl graphql-spring-boot-starter source: https://github.com/graphql- java-kickstart/graphql- spring-boot engine: graphql-java only subscription over ws: yes schema first Already been abandoned once, but forked and well maintained now. Latest version has issues with cors.
- 17. www.openweb.nl graphql-kotlin source: https://github.com/Expedia Group/graphql-kotlin engine: graphql-java only subscription over ws: yes code first Maintained by ExpediaGroup. Works with Apollo federation.
- 18. www.openweb.nl micronaut-graphql source: https://github.com/microna ut-projects/micronaut- graphql engine: graphql-java only subscription over ws: no both code first and schema first supported Subscription support was just added. Easy to use with Java, Kotlin or Groovy.
- 19. www.openweb.nl Running tests: goals ▰ Production like ▰ Keep increasing load ▰ Run for a long time ▰ Find the limits and bottlenecks
- 20. www.openweb.nl Running tests: setup {:max-interaction-time 5000 :min-loop-time 1000 :max-loops 8000 :max-time-outs 20 :loops-to-generate-generator 60 .. }
- 21. www.openweb.nl Running tests: average end to end Latency
- 22. www.openweb.nl Running tests: throughput, transactions/sec
- 23. www.openweb.nl Running tests: cpu GraphQL endpoint
- 24. www.openweb.nl Demo graphql.gklijs.tech Front-end served by Netlify, backend running locally dockerized.
- 25. www.openweb.nl What we learned ▰ Four JVM server implementations supporting subscriptions, each with pros and cons. ▰ Performance till about 300 new subscriptions/sec. ▰ Before saying yes make sure it’s a good option for your use case. It’s a part of GraphQL that is quite experimental.
- 26. www.openweb.nl Future of subscriptions ▰ Implementation in Rust is almost there. ▰ Maybe move to Rsocket or gRPC instead of websockets? ▰ Confluent might add GraphQL subscriptions to the Kafka ecosystem at some point.