Go for speed - Speaker Deck

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Go for speed

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Nick Bruun github.com/nickbruun @nickbruun bruun.co CTO @ Iconﬁnder Fairly carnivorous

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Trouble in icon paradise

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41 ms average response time from Django application during peak hours

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~2,000 ms wasted per search

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Perceivably slower

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The internals

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Icon ID Icon version ID Raster size https://www.iconﬁnder.com/icons/298255/677266/128/raster https://cdn0.iconﬁnder.com/data/icons/seo-smart-pack/128/ grey_new_seo2-43-128.png Public raster URL Protected raster URL

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Constant

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Signing requests

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https://www.iconﬁnder.com/icons/298255/677266/128/raster?token=…

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we know if the user has access right now When returning the link,

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we know if the user has access right now When returning the link,

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We’re okay with “right now” being an approximation

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Time limited token

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= "---"

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= "---" = hmac_sha1(, )

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= "---" = hmac_sha1(, ) = "--base64()"

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But, who checks the token?

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Enter Go The World’s least Google-able language… from Google

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Why Go?

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Networked service

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Highly concurrent ~3,000 requests/second from 100 connections/core

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Low memory footprint 14.09 MiB after 21 days

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Low CPU usage

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Static binary Cross-compilation = deployment heaven

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Less decisions to make

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Caveats

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Structured logging

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DIY

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Mature runtime != Mature language

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Conciseness 608 lines of code

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The end result

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1.2 ms average response time at peak hours

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0.1 % CPU usage at peak hours

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Go is awesome

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Go is awesome for simple services

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Go is a trade-oﬀ

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Go is a trade-oﬀ – choose wisely

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return