Building a Bank with Go - Golang UK 2015

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BUILDING A BANK  WITH GO @mattheath Golang UK Conference 2015

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@mattheath

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Mondo

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1895

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monoliths traditional dev

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TIME FOR A NEW  KIND OF BANK?

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You're doing quite well

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the majestik møøse

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the majestik moose

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sıkısınca

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sikisinca

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DATABASE APPLICATION

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DATABASE APPLICATION

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DATABASE DATABASES APPLICATION

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DATABASE DATABASES APPLICATION SEARCH

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DATABASE DATABASES APPLICATION CACHE SEARCH

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DATABASE DATABASES APPLICATION CACHE SEARCH CAT GIFS

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ALL HAIL THE MONOLITH

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DO NOT WANT

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DATABASE DATABASES MONOLITH CACHE SEARCH CAT GIFS

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MONOLITH

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SINGLE RESPONSIBILITY BOUNDED CONTEXT WELL DEFINED INTERFACES COMPOSABILITY

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LOAD BALANCER

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LOAD BALANCER HTTP API & ROUTING LAYER

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SERVICE TRANSPORT LOAD BALANCER HTTP API & ROUTING LAYER

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SERVICE SERVICE SERVICE TRANSPORT LOAD BALANCER HTTP API & ROUTING LAYER

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SERVICE SERVICE SERVICE TRANSPORT DATABASE DATABASE DATABASE LOAD BALANCER HTTP API & ROUTING LAYER

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SERVICE SERVICE SERVICE TRANSPORT DATABASE DATABASE DATABASE LOAD BALANCER DATACENTRE n HTTP API & ROUTING LAYER

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SERVICE SERVICE SERVICE TRANSPORT DATABASE DATABASE DATABASE LOAD BALANCER HTTP API & ROUTING LAYER DATACENTRE n

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gRPC Go KIT Kite go-micro

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mondough/typhon mondough/mercury

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LOAD BALANCER HTTP API & ROUTING LAYER ? ? ? ? ?

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Logic Handler Storage SERVICE

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mercury Logic Handler Storage SERVICE

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mercury Logic Handler Storage libraries SERVICE

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func main() { srv := service.Init(service.Config{ Name: "service.account", Description: "boop", }) srv.Server().AddEndpoints( handler.Create, handler.Read, handler.List, ) srv.Run() }

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type Server interface { Name() string AddEndpoints(eps ...Endpoint) RemoveEndpoints(eps ...Endpoint) Endpoint(name string) (Endpoint, bool) Endpoints() []Endpoint Start(trans transport.Transport) error Run(trans transport.Transport) Stop() Middleware() []ServerMiddleware SetMiddleware([]ServerMiddleware) AddMiddleware(ServerMiddleware) }

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func main() { srv := service.Init(service.Config{ Name: "service.account", Description: "boop", }) srv.Server().AddEndpoints( handler.Create, handler.Read, handler.List, ) srv.Run() }

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type Endpoint struct { Name string Handler Handler Request interface{} Response interface{} } type Handler func(req mercury.Request) (mercury.Response, error)

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func main() { srv := service.Init(service.Config{ Name: "service.account", Description: "boop", }) srv.Server().AddEndpoints( handler.Create, handler.Read, handler.List, ) srv.Run() }

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type Transport interface { Tomb() *tomb.Tomb Ready() <-chan struct{} Listen(serviceName string, inboundChan chan<- message.Request) error StopListening(serviceName string) bool Respond(request message.Request, response message.Response) error Send(req message.Request, timeout time.Duration) (message.Response, error) }

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api api api.customer api.customer service.customer service.customer

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type ClientMiddleware interface { ProcessClientRequest(req mercury.Request) mercury.Request ProcessClientResponse(rsp mercury.Response, ctx context.Context) mercury.Response ProcessClientError(err *terrors.Error, ctx context.Context) } type ServerMiddleware interface { ProcessServerRequest(req mercury.Request) (mercury.Request, mercury.Response) ProcessServerResponse(rsp mercury.Response, ctx context.Context) mercury.Response }

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type Context interface { Deadline() (deadline time.Time, ok bool) Done() <-chan struct{} Err() error Value(key interface{}) interface{} }

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api api api.customer api.customer service.customer service.customer

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api api api.customer api.customer service.customer service.customer SEND RECV SEND RECV RECV SEND RECV SEND

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mondough/phosphor mondough/phosphord

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PhosphorD Service A Trace Library goroutine chan UDP Service B Trace Library goroutine chan UDP PHOSPHOR HOST INSTANCES PUBLISH DASHBOARD AGGREGATION PERSISTANCE

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mercury Logic Handler Storage libraries SERVICE • PROVISIONING • SERVICE DISCOVERY • CONFIGURATION • MONITORING • AUTHENTICATION/AUTHORISATION • AB TESTING • SELF CONFIGURING CONNECTIVITY   TO THIRD-PARTY SERVICES

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SCRATCH STATIC SSL

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DEALING WITH   COMPLEXITY

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TESTING

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LOAD FAILURE DEGRADATION

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MONITORING

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type Checker func() (err error, metadata map[string]string)

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MONITOR YOUR BUSINESS LOGIC

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DISTRIBUTED  TRACING

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SMALL SIMPLE EASY TO LEARN

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CONCURRENCY NETWORKING INTERFACES

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DOWNSIDES?

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STARTING WITH MICROSERVICES?

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THANKS! @mattheath @getmondo Join our Alpha at getmondo.co.uk! Feedback: joind.in/14960

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CREDITS ATM: Thomas Hawk  IBM System/360: IBM Absorbed: Saxbald Photography Orbital Ion Cannon: www.rom.ac Go Gophers: Renee French Control Room: NASA ATM Failure: George Redgrave