107 lines
3.4 KiB
Kotlin
107 lines
3.4 KiB
Kotlin
package com.github.apognu.otter.repositories
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import android.net.Uri
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import com.github.apognu.otter.utils.*
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import com.github.kittinunf.fuel.Fuel
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import com.github.kittinunf.fuel.core.FuelError
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import com.github.kittinunf.fuel.core.ResponseDeserializable
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import com.github.kittinunf.fuel.coroutines.awaitObjectResponseResult
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import com.github.kittinunf.fuel.coroutines.awaitObjectResult
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import com.github.kittinunf.result.Result
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import com.google.gson.Gson
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import kotlinx.coroutines.Dispatchers.IO
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import kotlinx.coroutines.flow.Flow
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import kotlinx.coroutines.flow.collect
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import kotlinx.coroutines.flow.flow
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import kotlinx.coroutines.flow.flowOn
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import java.io.Reader
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import java.lang.reflect.Type
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import kotlin.math.ceil
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class HttpUpstream<D : Any, R : OtterResponse<D>>(val behavior: Behavior, private val url: String, private val type: Type) : Upstream<D> {
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enum class Behavior {
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Single, AtOnce, Progressive
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}
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override fun fetch(size: Int): Flow<Repository.Response<D>> = flow {
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if (behavior == Behavior.Single && size != 0) return@flow
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val page = ceil(size / AppContext.PAGE_SIZE.toDouble()).toInt() + 1
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val url =
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Uri.parse(url)
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.buildUpon()
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.appendQueryParameter("page_size", AppContext.PAGE_SIZE.toString())
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.appendQueryParameter("page", page.toString())
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.appendQueryParameter("scope", Settings.getScopes().joinToString(","))
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.build()
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.toString()
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get(url).fold(
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{ response ->
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val data = response.getData()
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when (behavior) {
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Behavior.Single -> emit(Repository.Response(Repository.Origin.Network, data, page, false))
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Behavior.Progressive -> emit(Repository.Response(Repository.Origin.Network, data, page, response.next != null))
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else -> {
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emit(Repository.Response(Repository.Origin.Network, data, page, response.next != null))
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if (response.next != null) fetch(size + data.size).collect { emit(it) }
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}
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}
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},
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{ error ->
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when (error.exception) {
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is RefreshError -> EventBus.send(Event.LogOut)
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else -> emit(Repository.Response(Repository.Origin.Network, listOf(), page, false))
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}
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}
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)
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}.flowOn(IO)
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class GenericDeserializer<T : OtterResponse<*>>(val type: Type) : ResponseDeserializable<T> {
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override fun deserialize(reader: Reader): T? {
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return Gson().fromJson(reader, type)
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}
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}
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suspend fun get(url: String): Result<R, FuelError> {
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return try {
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val request = Fuel.get(mustNormalizeUrl(url)).apply {
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if (!Settings.isAnonymous()) {
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header("Authorization", "Bearer ${Settings.getAccessToken()}")
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}
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}
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val (_, response, result) = request.awaitObjectResponseResult(GenericDeserializer<R>(type))
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if (response.statusCode == 401) {
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return retryGet(url)
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}
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result
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} catch (e: Exception) {
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Result.error(FuelError.wrap(e))
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}
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}
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private suspend fun retryGet(url: String): Result<R, FuelError> {
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return try {
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return if (HTTP.refresh()) {
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val request = Fuel.get(mustNormalizeUrl(url)).apply {
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if (!Settings.isAnonymous()) {
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header("Authorization", "Bearer ${Settings.getAccessToken()}")
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}
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}
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request.awaitObjectResult(GenericDeserializer(type))
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} else {
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Result.Failure(FuelError.wrap(RefreshError))
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}
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} catch (e: Exception) {
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Result.error(FuelError.wrap(e))
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}
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}
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} |