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HELLO! I’m Ian Kent I work @ONSdigital You can find me at @iankent

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I’ve written some seriously bad code…

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I’ve deployed some seriously bad code…

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Some of that code is still in production

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Production Ready Go

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Some Go things
 (that I won’t be talking about) • fmt • vet • lint • test • -race • pprof • vendor • cover

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Some not-Go things
 (that I also won’t be talking about) • logging • tracing • errors • retries

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Deploying Go 
 to production 
 is too easy

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0.1ms 1.4ms

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My mistakes • Client timeouts • Server timeouts • OS signals • Cancellation

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Client
 timeouts

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DefaultClient in net/http doesn’t time out

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Server
 timeouts

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ListenAndServe in net/http doesn’t time out

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A bit more about HTTP servers in Go

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OS signals

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A brief overview of OS signals KILL Handled by OS, kills the process STOP, CONT Handled by OS, pauses/resumes the process QUIT Sent by Ctrl + \, core dumps INFO Sent by Ctrl + T, process info PIPE Failed write to file descriptor INT Sent by Ctrl + C TERM Sent by kill

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Cancellation

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Cancellation isn’t just for servers

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Recap • Client timeouts • Server timeouts • OS signals • Cancellation https://bit.ly/production-ready-go

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Never start a goroutine without knowing how it will stop - Dave Cheney https://bit.ly/dave-cheney-goroutine

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Never consume resources without knowing how you will free them - Me

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Further reading • CloudFlare - So you want to expose Go on the internet
 https://bit.ly/cloudflare-expose-go
 • CloudImmunity - 50 shades of Go
 https://bit.ly/cloudimmunity-50-shades-of-go
 • spf13 - 7 common mistakes in Go
 https://bit.ly/spf13-common-mistakes-in-go

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Thank you