taler-android

WalletBackendApi.kt (5063B)

---

 /*
  * 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.encodeToString
 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 initialConfig: WalletRunConfig,
     private val versionReceiver: VersionReceiver,
     notificationReceiver: NotificationReceiver,
 ) {
 
     private val backendManager = BackendManager(notificationReceiver)
 
     fun startWallet() {
         backendManager.run()
         GlobalScope.launch(Dispatchers.IO) {
             sendInitMessage()
         }
     }
 
     fun stopWallet() {
         GlobalScope.launch(Dispatchers.IO) {
             sendRequest("shutdown")
             backendManager.destroy()
         }
     }
 
     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")
             put("config", JSONObject(BackendManager.json.encodeToString(initialConfig)))
         }.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 setWalletConfig(config: WalletRunConfig): WalletResponse<InitResponse> {
         return request("initWallet", InitResponse.serializer()) {
             put("config", JSONObject(BackendManager.json.encodeToString(config)))
         }
     }
 
     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)
         }
     }
 }