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fs2 Stream 1.x / Simple example of retry with logging
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import cats.effect.Sync | |
import io.chrisdavenport.log4cats.Logger | |
import cats._ | |
import cats.implicits._ | |
import scala.concurrent.duration._ | |
class RetryExample[F[_]](implicit F: Sync[F], log: Logger[F]) { | |
case class ApiError(msg: String) extends Exception(msg) | |
private def getTempFromInternet: EitherT[F, ApiError, Float] = ??? | |
def getTempWithRetries: F[Float] = { | |
val get: F[Float] = getTempFromInternet.value.map(_.leftWiden[Throwable]).rethrow | |
val maxAttempts = 5 | |
fs2.Stream.retry( | |
fo = get.onError(e => log.error(e)("Attempt failed")), | |
delay = 500.millis, | |
nextDelay = _ * 2, | |
maxAttempts = maxAttempts, | |
).onError(e => log.error(e)(s"Failed to get temperature after $maxAttempts tries")) | |
.compile.lastOrError | |
} | |
} |
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