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/*
* This file is part of GNU Taler
* (C) 2020 Taler Systems S.A.
*
* GNU Taler 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, or (at your option) any later version.
*
* GNU Taler 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
* GNU Taler; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
package net.taler.merchantlib
import io.ktor.client.call.body
import io.ktor.client.plugins.ClientRequestException
import io.ktor.client.plugins.ResponseException
import io.ktor.client.plugins.ServerResponseException
import kotlinx.serialization.Serializable
class Response<out T> private constructor(
private val value: Any?
) {
companion object {
suspend fun <T> response(request: suspend () -> T): Response<T> {
return try {
success(request())
} catch (e: Throwable) {
println(e)
failure(e)
}
}
fun <T> success(value: T): Response<T> =
Response(value)
fun <T> failure(e: Throwable): Response<T> =
Response(Failure(e))
}
val isFailure: Boolean get() = value is Failure
suspend fun handle(onFailure: ((String) -> Unit)? = null, onSuccess: ((T) -> Unit)? = null) {
if (value is Failure) onFailure?.let { it(getFailureString(value)) }
else onSuccess?.let {
@Suppress("UNCHECKED_CAST")
it(value as T)
}
}
suspend fun handleSuspend(
onFailure: ((String) -> Any)? = null,
onSuccess: (suspend (T) -> Any)? = null
) {
if (value is Failure) onFailure?.let { it(getFailureString(value)) }
else onSuccess?.let {
@Suppress("UNCHECKED_CAST")
it(value as T)
}
}
private suspend fun getFailureString(failure: Failure): String = when (failure.exception) {
is ClientRequestException -> getExceptionString(failure.exception)
is ServerResponseException -> getExceptionString(failure.exception)
else -> failure.exception.toString()
}
private suspend fun getExceptionString(e: ResponseException): String {
val response = e.response
return try {
val error: Error = response.body()
"Error ${error.code}: ${error.hint}"
} catch (ex: Exception) {
"Status code: ${response.status.value}"
}
}
private class Failure(val exception: Throwable)
@Serializable
private class Error(
val code: Int?,
val hint: String?
)
}
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