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Learning RSocket Using RSC
RSocket is a binary protocol that enables multiplexed, bidirectional communication over TCP or WebSocket with four interaction models: request-response, request-stream, request-channel, and fire-and-forget. It supports reactive streams and features such as backpressure, session resumption, client responders, authentication, and tracing, making it a powerful foundation for building reactive applications. The document introduces 'rsc', a CLI tool for RSocket akin to curl for HTTP, facilitating testing of RSocket server APIs.
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Learning RSocket Using RSC
- 1. Learning RSocket Using RSC September1–2, 2021 springone.io Toshiaki Maki (@making) Staff Cloud Native Architect at VMware https://github.com/making/learning-rsocket-using-rsc 1
- 2. What is RSocket? ●RSocket is a binary protocol for multiplexed, bidirectional over TCP or WebSocket ○ https://rsocket.io ○ Layer 5 or 6 in the OSI model / Application layer in the TCP/IP model ● 4 interaction models ○ Request Response ○ Request Stream ○ Request Channel ○ Fire and Forget ● Support Reactive Streams semantics (Backpressure) ● A Reactive Foundation project ○ https://www.reactive.foundation 2
- 3. FAQ: What’s differentfrom gRPC? 3 Transport Agnostic (TCP / WebSocket / …) RSocket Protocol Message Format Agnostic (JSON / CBOR / Protocol Buffers / ...) Programming Model Agnostic (Messaging / RPC / Functional Style) Language Agnostic (Java / Kotlin / JavaScript / Swift / ...) HTTP/2 Protocol Buffers RPC Style Language Agnostic (Go / C++ / Java / Python / C# / ...) Transport Message Format Programming Model Language
- 4. Spring ❤ RSocket SpringFramework provides a “Messaging Style” and “Functional Style” programming model for RSocket And a convenient RSocket Client like WebClient for Spring WebFlux https://docs.spring.io/spring-framework/docs/current/reference/html/web-reactive.html#rsocket 4 @Controller public class UpperCase { @MessageMapping("uc") String uc(@Payload String s) { return s.toUpperCase(); } } RSocketRequester requester = RSocketRequester.builder() .tcp("localhost", 7000); Mono<String> response = requester.route("uc") .data("Hello") .retrieveMono(String.class); Server Client
- 5. What is RSC? RSCis a CLI for RSocket like curl for HTTP. https://github.com/making/rsc Uses RSocket Java SDK and built with GraalVM into a native image. Available for Mac, Linux and Windows. Very convenient for testing RSocket Server API. 5 $ brew install making/tap/rsc $ rsc --route=uc --data=Hello tcp://localhost:7000 HELLO
- 6. 4 Interaction Models ●Request Response … send one message and receive one back ● Request Stream … send one message and receive a stream of messages ● Request Channel … send streams of messages in both directions ● Fire and Forget … send a one-way message 6
- 7. Request Response Request Response Payload Payload sendone message and receive one back 7
- 8. Request Stream Request Stream Payload Payload PayloadPayload … Payload send one message and receive a stream of messages back 8
- 9. Request Channel Request Channel Payload Payload PayloadPayload … Payload Payload … send streams of messages in both directions 9
- 10. Fire and Forget Fireand Forget Payload send a one-way message 10
- 11. DEMO: 4 interactionmodels 11
- 12. RSocket Features Demo ●Reactive Streams (Back Pressure) ● Session Resumption ● Client Responder ● Authentication ● Tracing 12
- 13. Reactive Streams (BackPressure support) Request_N N=3 Payload Payload Payload Request_N N=2 Payload Payload ... ... 13
- 14. Demo: Reactive Streams(Back Pressure support) 14
- 15. Session Resumption Request Stream E D C B A... Connectivity Lost 15
- 16. Session Resumption Resume G F E D C ... Backpressureworks, so stream data generation will stop until the connection is resumed. 16
- 17. DEMO: Session Resumption RSocketServer RSC socat Listens on port 7000 rsc --route ... --stream --resume 180 --delayElements 1000 --limitRate 1 tcp://localhost:7002 socat -d TCP-LISTEN:7002,fork,reuseaddr TCP:localhost:7000 17 Port 7002 Port 7000
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- 20. Client Responder Request Response Payload Payload Requester Responder ClientServer Server can be a Requester! 2 0
- 21. Firewall Client Responder Request Response Payload Payload Requester Responder ClientServer 21 ✅ Allow ❌ Deny ✅ ✅ inside outside
- 22. DEMO: Client Responder 2 2 REQUEST:SpringOne RESPONSE: Hello SpringOne! Responder Client Requester Server Server initiates a request response flow
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- 24. Authentication RSocket protocol supportsSimple Authentication ( username / password ) and Bearer Token Authentication https://github.com/rsocket/rsocket/blob/master/Extensions/Security/Authentication.md Spring Security supports RSocket Authentication 2 4
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- 26. Tracing RSocket protocol supportsZipkin Tracing (B3 Format). https://github.com/rsocket/rsocket/blob/master/Extensions/Tracing-Zipkin.md Spring Cloud Sleuth ( since 3.1 🆕 ) provides an instrumentation for RSocket Tracing. 2 6
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- 28. Wrap up ● RSocketis a binary protocol for multiplexed, bidirectional over TCP or WebSocket ● Spring ❤ RSocket ● RSC is a CLI for RSocket like curl for HTTP. ● 4 interaction models ○ Request Response ○ Request Stream ○ Request Channel ○ Fire and Forget ● Highlighted features ○ Backpressure ○ Session Resumption ○ Client Responder ○ Authentication ○ Tracing 2 8
- 29. https://github.com/making/learning-rsocket-using-rsc Event Sourcing withRSocket—Now We’re Talking! - Steven van Beelen Collaborative Applications at Scale with RSocket - Sergey Tselovalnikov Multiplatform Apps with Spring, Kotlin, and RSocket - Anton Arhipov, Oleh Dokuka #springone @SpringOne Stay Connected.