Spring Cloud Gateway RSocket Sample
TODO:
- Move ping and pong to use Spring Framework RSocket Messaging rather than raw RSocket
- Multiple pong servers to highlight gateway load balancing.
- Golang ping requester to highlight RSocket polyglot
- JS ping requester from browser. (Likely needs changes in gateway)
Succesful log messages
When ping and pong are communicating correctly, you should see logs like the following in pong:
2019-08-09 11:32:19.477 INFO 16726 --- [tor-tcp-epoll-1] o.s.c.r.s.pong.PongApplication$Pong : received ping1(1) in Pong
2019-08-09 11:32:20.186 INFO 16726 --- [tor-tcp-epoll-1] o.s.c.r.s.pong.PongApplication$Pong : received ping1(2) in Pong
And in ping you should see logs like:
2019-08-09 11:32:19.480 INFO 16077 --- [tor-tcp-epoll-1] o.s.c.r.s.ping.PingApplication$Ping : received pong(1) in Ping1
2019-08-09 11:32:20.189 INFO 16077 --- [tor-tcp-epoll-1] o.s.c.r.s.ping.PingApplication$Ping : received pong(2) in Ping1
Direct Mode: No Gateway
Run pong with spring.profiles.active=server. Then run ping.
Single Gateway Mode
Run gateway first. Then run ping.
You should see backpressure logs like:
2019-08-09 11:30:59.812 INFO 15199 --- [ parallel-2] o.s.c.r.s.ping.PingApplication$Ping : Dropped payload ping1
2019-08-09 11:31:00.811 INFO 15199 --- [ parallel-2] o.s.c.r.s.ping.PingApplication$Ping : Dropped payload ping1
Run pong.
Gateway Cluster Mode
Run gateway for first node. The run another gateway with spring.profiles.active=gateway2
You should see logs like this in 2nd gateway node:
2019-08-09 11:36:12.524 DEBUG 19644 --- [tor-tcp-epoll-1] o.s.c.gateway.rsocket.registry.Registry : Registering RSocket: [Metadata@5015196c name = 'ping', properties = map['id' -> 'pingproxy1']]
2019-08-09 11:36:12.526 DEBUG 19644 --- [tor-tcp-epoll-1] o.s.c.g.rsocket.registry.RegistryRoutes : Created Route for registered service [Route@57801e07 id = 'ping', targetMetadata = [Metadata@5015196c name = 'ping', properties = map['id' -> 'pingproxy1']], order = 0, predicate = org.springframework.cloud.gateway.rsocket.registry.RegistryRoutes$$Lambda$536/302508515@57d6f132, gatewayFilters = list[[empty]]]
And in the first gateway node:
2019-08-09 11:36:12.573 DEBUG 19475 --- [or-http-epoll-2] o.s.c.gateway.rsocket.registry.Registry : Registering RSocket: [Metadata@318e483 name = 'pong', properties = map['id' -> 'gateway21']]
2019-08-09 11:36:12.575 DEBUG 19475 --- [or-http-epoll-2] o.s.c.g.rsocket.registry.RegistryRoutes : Created Route for registered service [Route@6796b8e4 id = 'pong', targetMetadata = [Metadata@318e483 name = 'pong', properties = map['id' -> 'gateway21']], order = 0, predicate = org.springframework.cloud.gateway.rsocket.registry.RegistryRoutes$$Lambda$523/976465559@11bf03ce, gatewayFilters = list[[empty]]]
2019-08-09 11:36:12.576 DEBUG 19475 --- [or-http-epoll-2] o.s.c.g.r.s.SocketAcceptorFilterChain : filter chain completed with success
Run ping, you should see backpressure logs as above.
Run pong with spring.profiles.active=gateway2.
You should see successful log messages in ping and pong.
Additional ping client
During any mode, you can run another ping client with spring.profiles.active=ping2. The default ping client uses the 'request channel' RSocket method, where ping 2 uses 'request reply'.
The logs in pong will now show additional client pings such as:
2019-08-09 11:43:58.309 INFO 22645 --- [tor-tcp-epoll-1] o.s.c.r.s.pong.PongApplication$Pong : received ping1(280) in Pong
2019-08-09 11:43:58.449 INFO 22645 --- [tor-tcp-epoll-1] o.s.c.r.s.pong.PongApplication$Pong : received ping2(281) in Pong
Profile Specific Configuration
To see what each profile is setting, see the application.yml for each individual project. Each profile is another yaml document.