GILMOUR MICRO-SERVICE ARCHITECTURES USING 

SOA (VS SERVERS) SERVICES ▸ Logical Entities ▸ Independent ▸ Comprised of more services ▸ Multiple servers for load and tolerance ▸ Scalability ▸ Flexibility 

TO ERR IS HUMAN, TO BLAME IT ON SOMEONE IS MANAGEMENT POTENTIAL. - Someone on Internet WHY? 

WHO DUN IT? WHY? ▸ Software Problem ▸ Function Point Scalability ▸ Management Problem ▸ Authority ▸ Responsibility. 

DESIGN PATTERNS 

ASYNC (SIGNALS & SLOTS) 

ASYNC: SIGNALS AND SLOTS Slots Signal item.buy.500 item.buy.* item.buy.* item.buy.* group: push_msg FP scaling Push Message Server Push Message Server Web GILMOUR Email notifier SMS notifier Push Message server Item purchased VIP Item purchased item.buy.420 

ASYNC: SLOTS func main() { redis := backends.MakeRedis("127.0.0.1:6379", "pass") g := G.Get(redis) g.Slot("example.log", func(req *G.Request, _ *G.Message) { var msg string req.Data(&msg) log.Println(req.Sender(), "->", msg) }, nil) g.Start() } line := "Filtering out stop words" g.Signal("example.log", G.NewMessage().SetData(line)) ASYNC: SIGNALS 

REQUEST RESPONSE 

REQUEST RESPONSE Caller Service Hello? Aloha! Wrong Number type Message struct { Data interface{} `json:"data"` //Actual Payload Code int `json:"code"` //Response code if this is a response. This uses HTTP error codes Sender string `json:"sender"` //Origin of the request (unique for each request) } SENDER_ID CODE 

REQUEST data := G.NewMessage().SetData("hello?") opts := G.NewRequestOpts().SetTimeout(200) g.Request("echo", data, func(req *G.Request, resp *G.Message) { var msg string req.Data(&msg); fmt.Println("Echoclient: received", msg) }, opts) opts := G.NewHandlerOpts().SetGroup("exclusive") g.ReplyTo("echo", func(req *G.Request, resp *G.Message) { var msg string req.Data(&msg) resp.SetData(fmt.Sprintf("Pong %v", msg)) }, opts) RESPONSE 

SIGNAL-SLOT VS. REQUEST-RESPONSE 

ERRORS: DETECTION AND HANDLING 

GILMOUR ERRORS ERROR DETECTION ▸ timeouts ▸ server side - execution timed out. ▸ client side - response too late ▸ confirm_subscribers 

ERRORS: SIGNALS & SLOTS Web GILMOUR Email notifier SMS notifier Push message notifier Slots Error reporter Signal 

GILMOUR ERRORS Caller Service Hello? Wrong Number SENDER_ID CODE Error reporter type gilmourError struct { topic string //topic to which the request was sent requestData string //request payload userData string //implementation dependent information sender string //sender from the request timestamp string //timestamp of error backtrace interface{} //backtrace of the error code int //response code (non-200) } 

GILMOUR ERRORS ERROR HANDLING ▸ Ignore ▸ Publish ▸ Queue func main() { redis := backends.MakeRedis("127.0.0.1:6379", "pass") g := G.Get(redis) //g.SetErrorPolicy(protocol.ErrorPolicyQueue) //g.SetErrorPolicy(protocol.ErrorPolicyIgnore) g.SetErrorPolicy(protocol.ErrorPolicyPublish) } 

GILMOUR ERRORS ERROR SAMPLE 

OPS: MONITORING 

OPS: MONITORING SERVERS ▸ Log forwarding & aggregation ▸ Error Reporting ▸ Server and Health Monitoring 

OPS: MONITORING SERVICES ▸ Are the services servicing? ▸ Do services have spare capacity? ▸ Do services respond in time? 

OPS: MONITORING HEALTH BULLETIN Feb 23 12:25:14 qa-next-backend-manager0.datascale.io gilmour_health: D, [2016-02-23T06:55:12.930435 #22111] DEBUG -- : Ensuring topics have at least one subscriber Feb 23 12:25:14 qa-next-backend-manager0.datascale.io gilmour_health: D, [2016-02-23T06:55:12.931160 #22111] DEBUG -- : Ensuring that gilmour servers respond to health ping Feb 23 12:26:14 qa-next-backend-manager0.datascale.io backend_manager: D, [2016-02-23T06:56:12.932775 #9605] DEBUG -- : Executing handler for gilmour.health.ip-10-0-0-146-pid-9605- uuid-9d0484dd-08e5-4ec3-a3e4-9a109634712b from 2881867d41f24228b462b9eff0b7e88e 

OPS: MONITORING HEALTH BULLETIN 

OPS: MONITORING HEALTH BULLETIN 


 COMPOSITION 

COMPOSITION ▸ compose - service1 | service2 | composition3 ▸ andand - service1 && service2 && composition3 ▸ oror - service1 || composition2 || service3 ▸ batch ▸ (service1; service2; service3) > out ▸ service1; composition2; service3 > out ▸ parallel 

COMPOSITION popular := g.NewParallel( g.NewRequestComposition("example.popular3"), g.NewRequestComposition("example.popular4"), ) batch := g.NewPipe( g.NewRequestComposition("example.fetch"), g.NewRequestComposition("example.words"), g.NewRequestComposition("example.count"), popular, ) data := G.NewMessage() data.SetData("https://s3.amazonaws.com/ds-data-sample/test.txt") msg := <-batch.Execute(data) 

COMPOSITION popular := g.NewParallel( g.NewRequestComposition("example.popular3"), g.NewRequestComposition(“example.popular4"), g.NewRequestComposition("example.popular5"), ) batch := g.NewPipe( g.NewRequestComposition("example.fetch"), g.NewRequestComposition("example.words"), g.NewRequestComposition("example.stopfilter"), g.NewRequestComposition("example.count"), popular, &MyComposer{}, ) 
 data := G.NewMessage() data.SetData("https://s3.amazonaws.com/ds-data-sample/test.txt") msg := <-batch.Execute(data) 


 EXAMPLES 

EXAMPLES: ECHO SERVERS & CLIENT 

SAMPLE TEXT 

EXAMPLES: COMPOSITION 

GILMOUR RECAP ▸ Library only; no external process. ▸ No Load Balancer ▸ No Service Discovery ▸ Async - Signal, Slots ▸ Sync - Request, Reply ▸ Scaling - Exclusion groups. ▸ Error and Health Monitoring - HealthBulletin. ▸ Failure Detection ▸ Composition - Real micro-services. ▸ No message persistence. 

GILMOUR CREDITS & LINKS ▸ Aditya Godbole ▸ [email protected] ▸ Datascale.IO ▸ datascale.io ▸ Repository ▸ github.com/gilmour-libs