> If a third-party binding makes HTTP calls through concrete functions, we have ... | Hacker News

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troupo 71 days ago | parent | context | favorite | on: A couple million lines of Haskell: Production engi...

> If a third-party binding makes HTTP calls through concrete functions, we have no way to add tracing, no way to inject timeouts tuned to our SLOs, no way to simulate partner outages in testing, and no way to explain the 400ms gap in a trace

Given that tracing etc. is IO, are they just threading IO through the entirety of all their Haskell code?

tome 70 days ago [–]

Tracing doesn’t actually require IO, only emitting the traces does, and those two need not be done at the same point.

In any case, anywhere they’re doing HTTP calls they are already threading IO, so they don’t have to pay an additional cost.

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