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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.wallet.backend
import android.app.Application
import kotlinx.coroutines.DelicateCoroutinesApi
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.GlobalScope
import kotlinx.coroutines.launch
import kotlinx.coroutines.withContext
import kotlinx.serialization.KSerializer
import kotlinx.serialization.json.JsonObject
import kotlinx.serialization.json.decodeFromJsonElement
import net.taler.wallet.backend.TalerErrorCode.NONE
import org.json.JSONObject
import java.io.File
private const val WALLET_DB = "talerwalletdb.sqlite3"
@OptIn(DelicateCoroutinesApi::class)
class WalletBackendApi(
private val app: Application,
private val versionReceiver: VersionReceiver,
notificationReceiver: NotificationReceiver,
) {
private val backendManager = BackendManager(notificationReceiver)
init {
GlobalScope.launch(Dispatchers.IO) {
backendManager.run()
sendInitMessage()
}
}
private suspend fun sendInitMessage() {
val db = if (File(app.filesDir, "talerwalletdb.sql").isFile) {
// can be removed after a reasonable migration period (2024-02-02)
"${app.filesDir}/talerwalletdb.sql"
} else {
"${app.filesDir}/${WALLET_DB}"
}
request("init", InitResponse.serializer()) {
put("persistentStoragePath", db)
put("logLevel", "INFO")
}.onSuccess { response ->
versionReceiver.onVersionReceived(response.versionInfo)
}.onError { error ->
// TODO expose this to the UI as it can happen when using an older DB version
error("Error on init message: $error")
}
}
suspend fun sendRequest(operation: String, args: JSONObject? = null): ApiResponse {
return backendManager.send(operation, args)
}
suspend inline fun <reified T> request(
operation: String,
serializer: KSerializer<T>? = null,
noinline args: (JSONObject.() -> JSONObject)? = null,
): WalletResponse<T> = withContext(Dispatchers.Default) {
val json = BackendManager.json
try {
when (val response = sendRequest(operation, args?.invoke(JSONObject()))) {
is ApiResponse.Response -> {
val t: T = serializer?.let {
json.decodeFromJsonElement(serializer, response.result)
} ?: Unit as T
WalletResponse.Success(t)
}
is ApiResponse.Error -> {
val error: TalerErrorInfo = json.decodeFromJsonElement(response.error)
WalletResponse.Error(error)
}
}
} catch (e: Exception) {
val info = TalerErrorInfo(NONE, "", e.toString())
WalletResponse.Error(info)
}
}
// Returns raw JSON response instead of serialized object
suspend inline fun rawRequest(
operation: String,
noinline args: (JSONObject.() -> JSONObject)? = null,
): WalletResponse<JsonObject> = withContext(Dispatchers.Default) {
val json = BackendManager.json
try {
when (val response = sendRequest(operation, args?.invoke(JSONObject()))) {
is ApiResponse.Response -> {
WalletResponse.Success(response.result)
}
is ApiResponse.Error -> {
val error: TalerErrorInfo = json.decodeFromJsonElement(response.error)
WalletResponse.Error(error)
}
}
} catch (e: Exception) {
val info = TalerErrorInfo(NONE, "", e.toString())
WalletResponse.Error(info)
}
}
}
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