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 Go and Microservices Matt Heath, Monzo

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Hi, I’m Matt @mattheath

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A UK banking licence is authorised by the PRA and regulated by the PRA and FCA1, allowing deposit- taking and balance sheet lending. Once granted, it allows firms to passport across Europe, accessing This is followed by a “mobilisation” phase during which final capital is raised and IT systems are completed, before launching to the public. We received a UK banking licence in August 2016! FEB 2015 JAN 2016 JAN 2017 MAR FEB FEB APR MAR MAR APR MAY JUN JUL MAY APR JUN MAY JUL JUN AUG JUL SEP AUG NOV SEP DEC NOV DEC PRE APPLICATION APPLICATION MOBILISATION LAUNCH LICENCE WITH RESTRICTIONS 50K MAX DEPOSIT WE ARE HERE A UK banking licence is authorised by the PRA and regulated by the PRA and FCA1, allowing deposit- taking and balance sheet lending. Once granted, it allows firms to passport across Europe, accessing This is followed by a “mobilisation” phase during which final capital is raised and IT systems are completed, before launching to the public. We received a UK banking licence in August 2016! JAN 2016 JAN 2017 MAR FEB FEB APR MAR MAR APR MAY JUN JUL MAY APR JUN MAY JUL JUN AUG JUL SEP AUG NOV SEP DEC NOV DEC E APPLICATION APPLICATION MOBILISATION LAUNCH LICENCE WITH RESTRICTIONS WE ARE HERE AUG
 2017 JAN
 2016 Feb
 2015 APR
 2017 PREPAID
 LAUNCH LICENCE WITH RESTRICTIONS WE ARE HERE A UK banking licence is authorised by the PRA and regulated by the PRA and FCA1, allowing deposit- taking and balance sheet lending. Once granted, it allows firms to passport across Europe, accessing This is followed by a “mobilisation” phase during which final capital is raised and IT systems are completed, before launching to the public. We received a UK banking licence in August 2016! FEB 2015 JAN 2016 JAN 2017 MAR FEB FEB APR MAR MAR APR MAY APR JUN MAY JUL JUN AUG JUL SEP AUG NOV SEP DEC NOV DEC PRE APPLICATION APPLICATION MOBILISATION LICENCE WITH RESTRICTIONS WE ARE HERE

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Simple Effective Scalable

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Simplicity

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Lightweight Concurrency

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Goroutines

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// Blocking function call handleRequest()

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// Function runs concurrently go handleRequest()

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package main func main() { go handleRequest() // … }

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package main func main() { go handleRequest() // … } main

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package main func main() { go handleRequest() // … } handleRequest main

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"Do not communicate by sharing memory; instead, share memory by communicating." - Effective Go

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Channels

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Digging
 Deeper

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Scheduling Goroutines

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Managing Memory

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Language Stability

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Putting it all together

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But, “microservices”?

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Low overheads

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Simple deployment

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monzo/typhon

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type Service func(req Request) Response

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router.GET("/", List) router.POST("/", Register) router.DELETE("/:id", Deregister)

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// Handler is your Lambda function handler func Handler(request events.APIGatewayProxyRequest) (events.APIGatewayProxyResponse, error) { ... } func main() { lambda.Start(Handler) }

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?

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Application

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Application Database

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Application Database

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Application Databases

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Application Databases Search

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Application Databases Search Caching

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Application Databases Search Caching CAT GIFS

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APPLICATION Application

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Feb 2015 services Jan 2017 400

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?

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server

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server server

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server server server server server server

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server server server server server server ?

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server server server server server server

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server server server server server server Kubernetes

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server server server server server kubelet

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kubelet kubelet kubelet kubelet kubelet kubelet

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kubelet kubelet kubelet kubelet kubelet kubelet Kubernetes Master

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kubelet kubelet kubelet kubelet kubelet kubelet Kubernetes Master etcd

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kubernetes

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+ = ❤ +

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kubernetes service service service service service service service service service service

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Service

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Service Service

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Service Service Transport

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Service Service Transport Service Service

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Service Service Transport Service Service Client library Server library

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Service Discovery Load Balancing Timeouts Failure Detection Retries Rate Limiting Circuit Breaking Connection Pooling Context Propagation Metrics and Tracing Request Cancellation

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Service Service Service Service

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Service Service Service Service HTTP HTTP

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Service Service Service Service Kubernetes
 Service

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Service Discovery Load Balancing Timeouts Failure Detection Retries Rate Limiting Circuit Breaking Connection Pooling Context Propagation Metrics and Tracing Request Cancellation

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Service Discovery Load Balancing Timeouts Failure Detection Retries Rate Limiting Circuit Breaking Connection Pooling Context Propagation Metrics and Tracing Request Cancellation

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Service Service Service Service ?

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Service Service Service Service linkerd

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Service linkerd

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Service linkerd service
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Service Service Service Service linkerd service
 discovery

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Service Service Service Service linkerd

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Service Service Service Service linkerd

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Service Service Service Service linkerd

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Service Service Service Service linkerd

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Load Balancer

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Load Balancer Edge Proxy

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Load Balancer API
 Service Edge Proxy

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/webhooks —-> Webhook API

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Load Balancer Webhook
 API Edge Proxy

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Auth
 Service Webhook
 Service Load Balancer Webhook
 API Edge Proxy

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Auth
 Service Webhook
 Service Load Balancer Webhook
 API Database Edge Proxy

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Database Auth
 Service Webhook
 Service Load Balancer Webhook
 API Database Edge Proxy

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External Provider Database Auth
 Service Webhook
 Service Load Balancer Webhook
 API Database Edge Proxy

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CONSTRAIN
 COMPLEXITY

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SECURITY

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OPERATIONAL
 EASE

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WHAT HAVE
 WE LEARNT?

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Make services as small as possible

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Prefer services over libraries and shared code

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Prefer consistency in most cases

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Isolate shared infrastructure

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Onboarding people is hard

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Reduce complexity

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Monitor EVERYTHING

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WHAT WOULD WE
 DO DIFFERENTLY?

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