Retry extension function in coroutine

[shashwathkamath]

Idea: Handling transient failures (e.g., network timeouts) in suspending functions often requires custom retry logic, which is repetitive and error-prone. A simple, reusable retry mechanism with exponential backoff would improve developer experience in kotlinx.coroutines.

Proposed API:
suspend fun retryWithBackoff(
maxAttempts: Int = 3,
initialDelay: Duration = 500.milliseconds,
maxDelay: Duration = 5000.milliseconds,
backoffFactor: Double = 2.0,
predicate: (Throwable) -> Boolean = { true },
block: suspend () -> T
): Result

val result = retryWithBackoff { fetchDataFromServer() }

[murfel]

Hi Shashwath,

Sounds like you need ktor-client
https://ktor.io/docs/client-request-retry.html
https://api.ktor.io/ktor-client/ktor-client-core/io.ktor.client.plugins/-http-request-retry-config/

This use-case is outside of the scope of the coroutine library, as it also requires the library to incorporate knowledge about web services. kotlinx.coroutines provide the building blocks for coroutines such as launch, flow, etc., and other libraries are free to build upon the primitives.

[shashwathkamath]

makes sense. Thank you!

[fzhinkin]

Related issues/discussions:

• Exponential retry backoff on failure callback listener #1540
• Graceful degradation of spinlock-like implementations during internal errors or system malfunction #3635