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![honk@gosling effect-basic % bat demo.js
import './polyfill.js'
import { Context, Data, Effect, Layer, Schedule } from 'effect'
class Flaky extends Data.TaggedError('Flaky') {}
class Api extends Context.Service()('Api') {}
const ApiLive = Layer.effect(Api, Effect.gen(function* () {
let calls = 0
yield* Effect.acquireRelease(Effect.log('connect'), () => Effect.log('disconnect'))
return { get: id => Effect.suspend(() => ++calls < 3 ? Effect.fail(new Flaky()) : Effect.succeed({ id, calls })) }
}))
const main = Effect.gen(function* () {
const api = yield* Api
const user = yield* api.get(42).pipe(
Effect.tapError(e => Effect.log(`retrying after ${e._tag}`)),
Effect.retry(Schedule.recurs(5))
)
yield* Effect.log(`user ${user.id} after ${user.calls} calls`)
})
Effect.runSync(main.pipe(Effect.provide(ApiLive)))
honk@gosling effect-basic % ~/porffor/porf demo.js
[20:38:07.977] INFO (#1): connect
[20:38:07.977] INFO (#1): retrying after Flaky
(alt text too long sorry)](/pic/https%3A%2F%2Fpbs%2Etwimg%2Ecom%2Fmedia%2FHTkpD1%2DWgAANrHI%2Ejpg%3Fname%3Dsmall%26format%3Dwebp)
ALT honk@gosling effect-basic % bat demo.js import './polyfill.js' import { Context, Data, Effect, Layer, Schedule } from 'effect' class Flaky extends Data.TaggedError('Flaky') {} class Api extends Context.Service()('Api') {} const ApiLive = Layer.effect(Api, Effect.gen(function* () { let calls = 0 yield* Effect.acquireRelease(Effect.log('connect'), () => Effect.log('disconnect')) return { get: id => Effect.suspend(() => ++calls < 3 ? Effect.fail(new Flaky()) : Effect.succeed({ id, calls })) } })) const main = Effect.gen(function* () { const api = yield* Api const user = yield* api.get(42).pipe( Effect.tapError(e => Effect.log(`retrying after ${e._tag}`)), Effect.retry(Schedule.recurs(5)) ) yield* Effect.log(`user ${user.id} after ${user.calls} calls`) }) Effect.runSync(main.pipe(Effect.provide(ApiLive))) honk@gosling effect-basic % ~/porffor/porf demo.js [20:38:07.977] INFO (#1): connect [20:38:07.977] INFO (#1): retrying after Flaky (alt text too long sorry)
ALT Effect 4.0 stable release announcement on a dark background. Large white “4.0” above “Production-ready. Out now.” A timeline along the bottom progresses from 3.0 Stable to 4.0 RC to 4.0 Stable.
ALT Effect 4.0 stable release announcement on a dark background. Large white “4.0” above “Production-ready. Out now.” A timeline along the bottom progresses from 3.0 Stable to 4.0 RC to 4.0 Stable.
