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Currency repository#199
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Currency repository #199
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81177ab
feat: create the CurrencyRepo.kt
jvsena42 9e425aa
refactor: access repository logic
jvsena42 b313541
feat: cache methods
jvsena42 0485d9d
feat: implement caching
jvsena42 aa0261c
feat: reset cache
jvsena42 fa3e485
feat: add TODO
jvsena42 340d83e
fix: test
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,46 @@ | ||
| package to.bitkit.data | ||
| import android.content.Context | ||
| import androidx.datastore.core.DataStore | ||
| import androidx.datastore.core.DataStoreFactory | ||
| import androidx.datastore.dataStoreFile | ||
| import dagger.hilt.android.qualifiers.ApplicationContext | ||
| import kotlinx.coroutines.flow.Flow | ||
| import kotlinx.serialization.Serializable | ||
| import to.bitkit.data.serializers.AppCacheSerializer | ||
| import to.bitkit.data.serializers.SettingsSerializer | ||
| import to.bitkit.models.BitcoinDisplayUnit | ||
| import to.bitkit.models.FxRate | ||
| import to.bitkit.models.PrimaryDisplay | ||
| import to.bitkit.models.Suggestion | ||
| import to.bitkit.models.TransactionSpeed | ||
| import to.bitkit.utils.Logger | ||
| import javax.inject.Inject | ||
| import javax.inject.Singleton | ||
| @Singleton | ||
| class CacheStore @Inject constructor( | ||
| @ApplicationContext private val context: Context, | ||
| ) { | ||
| private val store: DataStore<AppCacheData> = DataStoreFactory.create( | ||
| serializer = AppCacheSerializer, | ||
| produceFile = { context.dataStoreFile("app_cache.json") }, | ||
| ) | ||
| val data: Flow<AppCacheData> = store.data | ||
| suspend fun update(transform: (AppCacheData) -> AppCacheData) { | ||
| store.updateData(transform) | ||
| } | ||
| suspend fun reset() { | ||
| store.updateData { AppCacheData() } | ||
| Logger.info("Deleted all app cached data.") | ||
| } | ||
| } | ||
| @Serializable | ||
| data class AppCacheData( | ||
| val cachedRates : List<FxRate> = listOf() | ||
| ) |
27 changes: 27 additions & 0 deletions
27 app/src/main/java/to/bitkit/data/serializers/AppCacheSerializer.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,27 @@ | ||
| package to.bitkit.data.serializers | ||
| import androidx.datastore.core.Serializer | ||
| import kotlinx.serialization.SerializationException | ||
| import to.bitkit.data.AppCacheData | ||
| import to.bitkit.data.SettingsData | ||
| import to.bitkit.di.json | ||
| import to.bitkit.utils.Logger | ||
| import java.io.InputStream | ||
| import java.io.OutputStream | ||
| object AppCacheSerializer : Serializer<AppCacheData> { | ||
| override val defaultValue: AppCacheData = AppCacheData() | ||
| override suspend fun readFrom(input: InputStream): AppCacheData { | ||
| return try { | ||
| json.decodeFromString(input.readBytes().decodeToString()) | ||
| } catch (e: SerializationException) { | ||
| Logger.error("Failed to deserialize: $e") | ||
| defaultValue | ||
| } | ||
| } | ||
| override suspend fun writeTo(t: AppCacheData, output: OutputStream) { | ||
| output.write(json.encodeToString(t).encodeToByteArray()) | ||
| } | ||
| } |
188 changes: 188 additions & 0 deletions
188 app/src/main/java/to/bitkit/repositories/CurrencyRepo.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,188 @@ | ||
| package to.bitkit.repositories | ||
| import kotlinx.coroutines.CoroutineDispatcher | ||
| import kotlinx.coroutines.CoroutineScope | ||
| import kotlinx.coroutines.SupervisorJob | ||
| import kotlinx.coroutines.currentCoroutineContext | ||
| import kotlinx.coroutines.delay | ||
| import kotlinx.coroutines.flow.Flow | ||
| import kotlinx.coroutines.flow.MutableStateFlow | ||
| import kotlinx.coroutines.flow.StateFlow | ||
| import kotlinx.coroutines.flow.asStateFlow | ||
| import kotlinx.coroutines.flow.combine | ||
| import kotlinx.coroutines.flow.distinctUntilChanged | ||
| import kotlinx.coroutines.flow.flow | ||
| import kotlinx.coroutines.flow.flowOn | ||
| import kotlinx.coroutines.flow.map | ||
| import kotlinx.coroutines.flow.update | ||
| import kotlinx.coroutines.isActive | ||
| import kotlinx.coroutines.launch | ||
| import kotlinx.coroutines.withContext | ||
| import to.bitkit.data.CacheStore | ||
| import to.bitkit.data.SettingsStore | ||
| import to.bitkit.di.BgDispatcher | ||
| import to.bitkit.env.Env | ||
| import to.bitkit.models.BitcoinDisplayUnit | ||
| import to.bitkit.models.ConvertedAmount | ||
| import to.bitkit.models.FxRate | ||
| import to.bitkit.models.PrimaryDisplay | ||
| import to.bitkit.models.Toast | ||
| import to.bitkit.services.CurrencyService | ||
| import to.bitkit.ui.shared.toast.ToastEventBus | ||
| import to.bitkit.utils.Logger | ||
| import java.util.Date | ||
| import javax.inject.Inject | ||
| import javax.inject.Singleton | ||
| @Singleton | ||
| class CurrencyRepo @Inject constructor( | ||
| @BgDispatcher private val bgDispatcher: CoroutineDispatcher, | ||
| private val currencyService: CurrencyService, | ||
| private val settingsStore: SettingsStore, | ||
| private val cacheStore: CacheStore | ||
| ) { | ||
| private val repoScope = CoroutineScope(bgDispatcher + SupervisorJob()) | ||
| private val _currencyState = MutableStateFlow(CurrencyState()) | ||
| val currencyState: StateFlow<CurrencyState> = _currencyState.asStateFlow() | ||
| private var lastSuccessfulRefresh: Date? = null | ||
| private var isRefreshing = false | ||
| private val pollingFlow: Flow<Unit> | ||
| get() = flow { | ||
| while (currentCoroutineContext().isActive) { | ||
| emit(Unit) | ||
| delay(Env.fxRateRefreshInterval) | ||
| } | ||
| }.flowOn(bgDispatcher) | ||
| init { | ||
| startPolling() | ||
| observeStaleData() | ||
| collectCachedData() | ||
| } | ||
| private fun startPolling() { | ||
| repoScope.launch { | ||
| pollingFlow.collect { | ||
| refresh() | ||
| } | ||
| } | ||
| } | ||
| private fun observeStaleData() { | ||
| repoScope.launch { | ||
| currencyState.map { it.hasStaleData }.distinctUntilChanged().collect { isStale -> | ||
| if (isStale) { | ||
| ToastEventBus.send( | ||
| type = Toast.ToastType.ERROR, | ||
| title = "Rates currently unavailable", | ||
| description = "An error has occurred. Please try again later." | ||
| ) | ||
| } | ||
| } | ||
| } | ||
| } | ||
| private fun collectCachedData() { | ||
| repoScope.launch { | ||
| combine(settingsStore.data, cacheStore.data) { settings, cachedData -> | ||
| _currencyState.value.copy( | ||
| rates = cachedData.cachedRates, | ||
| selectedCurrency = settings.selectedCurrency, | ||
| displayUnit = settings.displayUnit, | ||
| primaryDisplay = settings.primaryDisplay, | ||
| currencySymbol = cachedData.cachedRates.firstOrNull { rate -> | ||
| rate.quote == settings.selectedCurrency | ||
| }?.currencySymbol ?: "$" | ||
| ) | ||
| }.collect { newState -> | ||
| _currencyState.update { newState } | ||
| } | ||
| } | ||
| } | ||
| suspend fun triggerRefresh() = withContext(bgDispatcher) { | ||
| refresh() | ||
| } | ||
| private suspend fun refresh() { | ||
| if (isRefreshing) return | ||
| isRefreshing = true | ||
| try { | ||
| val fetchedRates = currencyService.fetchLatestRates() | ||
| cacheStore.update { it.copy(cachedRates = fetchedRates) } | ||
| _currencyState.update { | ||
| it.copy( | ||
| error = null, | ||
| hasStaleData = false | ||
| ) | ||
| } | ||
| lastSuccessfulRefresh = Date() | ||
| Logger.debug("Currency rates refreshed successfully", context = TAG) | ||
| } catch (e: Exception) { | ||
| _currencyState.update { it.copy(error = e) } | ||
| Logger.error("Currency rates refresh failed", e, context = TAG) | ||
| lastSuccessfulRefresh?.let { last -> | ||
| _currencyState.update { | ||
| it.copy(hasStaleData = Date().time - last.time > Env.fxRateStaleThreshold) | ||
| } | ||
| } | ||
| } finally { | ||
| isRefreshing = false | ||
| } | ||
| } | ||
| suspend fun togglePrimaryDisplay() = withContext(bgDispatcher) { | ||
| currencyState.value.primaryDisplay.let { | ||
| val newDisplay = if (it == PrimaryDisplay.BITCOIN) PrimaryDisplay.FIAT else PrimaryDisplay.BITCOIN | ||
| settingsStore.update { it.copy(primaryDisplay = newDisplay) } | ||
| } | ||
| } | ||
| suspend fun setPrimaryDisplayUnit(unit: PrimaryDisplay) = withContext(bgDispatcher) { | ||
| settingsStore.update { it.copy(primaryDisplay = unit) } | ||
| } | ||
| suspend fun setBtcDisplayUnit(unit: BitcoinDisplayUnit) = withContext(bgDispatcher) { | ||
| settingsStore.update { it.copy(displayUnit = unit) } | ||
| } | ||
| suspend fun setSelectedCurrency(currency: String) = withContext(bgDispatcher) { | ||
| settingsStore.update { it.copy(selectedCurrency = currency) } | ||
| refresh() | ||
| } | ||
| fun getCurrencySymbol(): String { | ||
| val currentState = currencyState.value | ||
| return currentState.rates.firstOrNull { it.quote == currentState.selectedCurrency }?.currencySymbol ?: "" | ||
| } | ||
| // Conversion helpers | ||
| fun convertSatsToFiat(sats: Long, currency: String? = null): ConvertedAmount? { | ||
| val targetCurrency = currency ?: currencyState.value.selectedCurrency | ||
| val rate = currencyService.getCurrentRate(targetCurrency, currencyState.value.rates) | ||
| return rate?.let { currencyService.convert(sats = sats, rate = it) } | ||
| } | ||
| fun convertFiatToSats(fiatAmount: Double, currency: String? = null): Long { | ||
| val sourceCurrency = currency ?: currencyState.value.selectedCurrency | ||
| return currencyService.convertFiatToSats(fiatAmount, sourceCurrency, currencyState.value.rates) | ||
| } | ||
| companion object { | ||
| private const val TAG = "CurrencyRepo" | ||
| } | ||
| } | ||
| data class CurrencyState( | ||
| val rates: List<FxRate> = emptyList(), | ||
| val error: Throwable? = null, | ||
| val hasStaleData: Boolean = false, | ||
| val selectedCurrency: String = "USD", | ||
| val currencySymbol: String = "$", | ||
| val displayUnit: BitcoinDisplayUnit = BitcoinDisplayUnit.MODERN, | ||
| val primaryDisplay: PrimaryDisplay = PrimaryDisplay.BITCOIN, | ||
| ) |
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