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mazrean
mazrean

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Speed Up Your Go App Startup with Parallel Dependency Injection

#go #concurrency #performance #programming

I built Kessoku to solve a simple problem: Go apps start too slowly.

Your app probably initializes services like this:

DB (300ms) → Cache (200ms) → Auth (100ms) = 600ms 😴
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Kessoku runs them in parallel:

DB (300ms) ┐
Cache (200ms) ├─ = 300ms 🚀
Auth (100ms) ┘
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Quick Example 

//go:generate go tool kessoku $GOFILE
var _ = kessoku.Inject[*App]("InitApp",
    kessoku.Async(kessoku.Provide(NewDB)),      // These run
    kessoku.Async(kessoku.Provide(NewCache)),   // at the same
    kessoku.Async(kessoku.Provide(NewAuth)),    // time!
    kessoku.Provide(NewApp),
)
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Get Started 

go get -tool github.com/mazrean/kessoku/cmd/kessoku
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That's it. Your app now starts faster.

Why Kessoku?

  • Compile-time: Zero runtime overhead (unlike uber/fx)
  • Automatic: Just add Async() to parallelize
  • Compatible: Drop-in replacement for google/wire

Perfect for microservices, serverless functions, or any app with multiple slow initializations.

⭐ github.com/mazrean/kessoku

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