GoDays 2020, January 2020, Berlin: Talk by Mario-Leander Reimer (@LeanderReimer, Principal Software Architect at QAware) === Please download slides if blurred! === Abstract: Cloud native applications are popular these days. They promise superior reliability and almost arbitrary scalability. They follow three key principles: they are built and composed as microservices, packaged and distributed in containers and executed dynamically in the cloud. But building truly cloud-native, enterprise-ready microservices is a challenging endeavor, way more than just doing REST and Docker. A lot of concerns and design principles need to be addressed: service exposition, messaging, persistence, resiliency or diagnosability, just to name a few. This session shows that the Go language and it's library universe is well suited to tackle the challenges of building modern, rock-solid microservices that are fit for the enterprise.

1. A Hitchhiker's Guide
to Enterprise Microservices with Go
{{ define "GoDays 2020“ }} @LeanderReimer #cloudnativenerd {{ end }}

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#whoami
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Mario-Leander Reimer
Chief Software Architect
QAware GmbH

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Why you should Go Cloud Native in 2020?
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https://www.loodse.com/blog/why-you-should-go-cloud-native-in-2020
Today

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Enterprise Cloud Native
ANTIFRAGILITYHYPERSCALE
TRAFFIC, DATA, FEATURES
RECRUITING
SPEED
DEVOPS &
CONTINUOUS DELIVERY
OPEX SAVINGS
(automation & utilization)

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https://www.tiobe.com/tiobe-index/
Tiobe
Ranking

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Criteria for Enterprise usage
✓ Maturity: active community, stable releases, security patches
✓ IDE Support: developer friendliness. IntelliJ, VS Code, Goland, …
✓ Tooling: build tools, dependency management, debuggers, profilers
✓ Library Ecosystem: good standard library and open source libraries
✓ Documentation: online docs, literature and training available
✓ Integration: good interop with Enterprise standards and technology
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This is NOT an Enterprise Microservice!
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package main
import (
"fmt"
"net/http"
"os"
)
func main() {
http.HandleFunc("/", index)
http.ListenAndServe(":8080", nil)
}
func index(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(http.StatusOK)
fmt.Fprintf(w, "Hello World @ GoDays 2020.“)
}
But Go provides a solid foundation
to build Enterprise Microservices.

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Essential Cloud-native Design Principles
• Design for Distribution: Containers; microservices; API driven development.
• Design for Configuration: One image, multiple environments.
• Design for Resiliency: Fault-tolerant and self-healing.
• Design for Elasticity: Scales dynamically and reacts to stimuli.
• Design for Delivery: Short roundtrips and automated provisioning.
• Design for Performance: Responsive; concurrent; resource efficient.
• Design for Automation: Automated Dev & Ops tasks.
• Design for Diagnosability: Cluster-wide logs, metrics and traces.
• Design for Security: Secure Endpoints, Zero Trust, E2E-Encryption
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The Anatomy of an
Enterprise Microservice
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• REST APIs
• Swagger + OpenAPI v3
• RPC APIs
• Loose Coupling
• Event Driven Architecture
• CQRS, Event Sourcing
• Consul, Kubernetes, …
• Cloud Provider
• Circuit Breaking
• Bulk Heading
• Environment Variables
• Kubernetes ConfigMaps
• YAML or JSON files
• Consensus with DDS, Raft, etcd, …• Support for RDBMS, noSQL, et al.
• In-Memory Caches
• Redis, Memcached
• TLS, mTLS
• Encryption + Signing
• JWT, OpenID
• Structured Logging
• Health & Metrics
• Prometheus, et.al.
• OpenTracing Support
• Jaeger, Zipkin Integration

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go get github.com/micro/go-micro
go get github.com/NYTimes/gizmo/…
go get github.com/koding/kite
Microservice Chassis
go get github.com/gin-gonic/gin
go get github.com/go-martini/martini
go get github.com/urfave/negroni
go get github.com/gorilla/mux
Web Frameworks

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import log "github.com/inconshreveable/log15"
import log „github.com/sirupsen/logrus"
import "github.com/prometheus/client_golang/prometheus"
import "github.com/armon/go-metrics"
import "github.com/opentracing/opentracing-go"
import „github.com/uber/jaeger-client-go"
import "github.com/jinzhu/gorm"
import „upper.io/db.v3/postgresql" (mongo, …)
import "gopkg.in/gorp.v1"
import „github.com/jmoiron/sqlx"

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Is Go and its library universe fit
for the Cloud-native enterprise?
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Yes.

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Is Go and it’s library universe fit
for the Cloud-native enterprise?
14
Yes, but …

15. Mario-Leander Reimer
Chief Software Architect, QAware GmbH
mario-leander.reimer@qaware.de
https://www.qaware.de
https://speakerdeck.com/lreimer/
https://github.com/lreimer/
&