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Microservices & Go Matt Heath, Monzo
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Hi, I’m Matt @mattheath
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monoliths traditional dev
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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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ALL HAIL THE MONOLITH
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Application Databases Search Caching CAT GIFS
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APPLICATION Application
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Single Responsibility Principle
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Bounded Context
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Well defined Interfaces
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Composability
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Simple
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Lightweight Concurrency
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// Blocking handleRequest()
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// Runs concurrently // in a goroutine go handleRequest()
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Go Routines
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Channels
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Static Linking
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monzo/typhon
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Service Service
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Service Service Message Bus
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Service Service Message Bus Request Queue
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Service Service Message Bus Service Service Request Queue - Service Discovery - Load Balancing
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Service Service Message Bus Service Service Pull Request Queue
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Service Service Message Bus Service Service
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0 40 80 160 120 Feb 2015 Oct 2016
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Service Service Message Bus Service Service Client library Server library
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Service Service Service Service HTTP HTTP
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Service Discovery Load Balancing Timeouts and Expirations Retries Rate Limiting Connection Pooling Circuit Breaking Failure Detection Metrics and Tracing Interrupts Context Propagation
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Service Service Service Service HTTP HTTP ?
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Service Service Service Service HTTP HTTP linkerd
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Service Discovery Load Balancing Timeouts and Expirations Retries Rate Limiting Connection Pooling Circuit Breaking Failure Detection Metrics and Tracing Interrupts Context Propagation
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Load Balancer
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Load Balancer HTTP API & Routing Layer
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Load Balancer HTTP API & Routing Layer API Service
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/webhooks —-> Webhook API
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Load Balancer HTTP API & Routing Layer Webhook API
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Auth Service Webhook Service Load Balancer HTTP API & Routing Layer Webhook API
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Auth Service Webhook Service Load Balancer HTTP API & Routing Layer Webhook API Database
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Database Auth Service Webhook Service Load Balancer HTTP API & Routing Layer Webhook API Database
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External Provider Database Auth Service Webhook Service Load Balancer HTTP API & Routing Layer Webhook API Database
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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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Making our service reliable
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+ = ❤
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Webhook Service Webhook Service Webhook Service Load Balancer HTTP API & Routing Layer Webhook API
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Webhook Service Webhook Service Webhook Service Load Balancer HTTP API & Routing Layer Webhook API
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Webhook Service Webhook Service Webhook Service Webhook Service Load Balancer HTTP API & Routing Layer Webhook API
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Webhook Service Webhook Service Webhook Service Webhook Service Load Balancer HTTP API & Routing Layer Webhook API Slow or Errors
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Event Driven Architecture
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Service A Service B Load Balancer HTTP API & Routing Layer API Service
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API Service Service A Service B Load Balancer HTTP API & Routing Layer
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API Service Service A Service B Load Balancer HTTP API & Routing Layer
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API Service Service A Service B Load Balancer HTTP API & Routing Layer Service C Service D Service E
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Context Propagation
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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
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8096820c-3b7b-47ec-bce6-1c239252ab40
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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
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package context type Context interface { Deadline() (deadline time.Time, ok bool) Done() <-chan struct{} Err() error Value(key interface{}) interface{} }
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package context type Context interface { Deadline() (deadline time.Time, ok bool) Done() <-chan struct{} Err() error Value(key interface{}) interface{} }
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package context 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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api api.customer service.customer SEND RECV SEND RECV RECV SEND RECV SEND phosphor
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API card-api card-processing cards transactions balance transaction-enrichment merchant feed-generator feed apns API card-api card-processing cards transactions balance transaction-enrichment merchant feed-generator feed apns
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API card-api card-processing cards transactions balance transaction-enrichment merchant feed-generator feed apns API card-api card-processing cards transactions balance transaction-enrichment merchant feed-generator feed apns
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API card-api card-processing cards transactions balance transaction-enrichment merchant feed-generator feed apns API card-api card-processing cards transactions balance transaction-enrichment merchant feed-generator feed apns
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API card-api card-processing cards transactions balance transaction-enrichment merchant feed-generator feed apns API card-api card-processing cards transactions balance transaction-enrichment merchant feed-generator feed apns
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API card-api card-processing cards transactions balance transaction-enrichment merchant feed-generator feed apns API card-api card-processing cards transactions balance transaction-enrichment merchant feed-generator feed apns
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API card-api card-processing cards transactions balance transaction-enrichment merchant feed-generator feed apns API card-api card-processing cards transactions balance transaction-enrichment merchant feed-generator feed apns
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Small Simple Easy to learn
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Concurrency Channels
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Downsides?
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Starting with Microservices?
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Thanks! @mattheath @monzo
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ATM: Thomas Hawk Bank of Commerce: ABQ Museum Archives IBM System/360: IBM Absorbed: Saxbald Photography Go Gopher: Renee French Credits
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