86 lines
3.1 KiB
Kotlin
86 lines
3.1 KiB
Kotlin
/*
|
|
* Copyright (c) 2020 Proton Technologies AG
|
|
* This file is part of Proton Technologies AG and ProtonCore.
|
|
*
|
|
* ProtonCore is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* ProtonCore is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with ProtonCore. If not, see <https://www.gnu.org/licenses/>.
|
|
*/
|
|
package me.proton.core.network.domain
|
|
|
|
import kotlinx.coroutines.delay
|
|
import kotlin.math.pow
|
|
import kotlin.random.Random
|
|
|
|
/**
|
|
* Implementation of [ApiManager].
|
|
*
|
|
* @param Api API interface
|
|
* @property client [ApiClient] for client-library integration.
|
|
* @property primaryBackend [ApiBackend] for regular API calls.
|
|
* @property dohApiHandler [DohApiHandler] instance to handle DoH logic for API calls.
|
|
* @property errorHandlers list of [ApiErrorHandler] for call error recovery.
|
|
* @property monoClockMs Monotonic clock with millisecond resolution.
|
|
*/
|
|
class ApiManagerImpl<Api>(
|
|
private val client: ApiClient,
|
|
private val primaryBackend: ApiBackend<Api>,
|
|
private val dohApiHandler: DohApiHandler<Api>,
|
|
private val errorHandlers: List<ApiErrorHandler<Api>>,
|
|
private val monoClockMs: () -> Long
|
|
) : ApiManager<Api> {
|
|
|
|
override suspend operator fun <T> invoke(
|
|
forceNoRetryOnConnectionErrors: Boolean,
|
|
block: suspend (Api) -> T
|
|
): ApiResult<T> {
|
|
val call = ApiManager.Call(monoClockMs(), block)
|
|
return when {
|
|
forceNoRetryOnConnectionErrors -> handledCall(primaryBackend, call)
|
|
client.shouldUseDoh -> dohApiHandler(::handledCall, call)
|
|
else -> callWithBackoff(call)
|
|
}
|
|
}
|
|
|
|
private suspend fun <T> callWithBackoff(call: ApiManager.Call<Api, T>): ApiResult<T> {
|
|
fun sample(min: Double, max: Double) = min + Random.nextDouble() * (max - min)
|
|
var retryCount = 0
|
|
while (true) {
|
|
val result = handledCall(primaryBackend, call)
|
|
if (retryCount < client.backoffRetryCount && result.isRetryable()) {
|
|
val delayCoefficient = sample(
|
|
min = 2.0.pow(retryCount),
|
|
max = 2.0.pow(retryCount + 1)
|
|
)
|
|
delay(client.backoffBaseDelayMs * delayCoefficient.toLong())
|
|
retryCount++
|
|
} else {
|
|
return result
|
|
}
|
|
}
|
|
}
|
|
|
|
private suspend fun <T> handledCall(
|
|
backend: ApiBackend<Api>,
|
|
call: ApiManager.Call<Api, T>
|
|
): ApiResult<T> {
|
|
val backendResult = backend(call)
|
|
return errorHandlers.fold(backendResult) { currentResult, handler ->
|
|
if (currentResult is ApiResult.Error) {
|
|
handler.invoke(backend, currentResult, call)
|
|
} else {
|
|
currentResult
|
|
}
|
|
}
|
|
}
|
|
}
|