[#1737] Create transaction error handling

* #1737 Create transaction error handling

Closes #1737

* QR code bitmap fix

Now we create the shareable bitmap on demand

---------

Co-authored-by: Milan Cerovsky <milan@z.cash>

ui-lib/src/main/java/co/electriccoin/zcash/ui/screen/request/model/Request.kt

@@ -1,7 +1,6 @@
 package co.electriccoin.zcash.ui.screen.request.model
 
 import android.content.Context
-import androidx.compose.ui.graphics.ImageBitmap
 import cash.z.ecc.android.sdk.ext.convertUsdToZec
 import cash.z.ecc.android.sdk.ext.toZecString
 import cash.z.ecc.android.sdk.model.FiatCurrencyConversion
@@ -11,7 +10,6 @@ import cash.z.ecc.android.sdk.model.Zatoshi
 import cash.z.ecc.android.sdk.model.fromZecString
 import cash.z.ecc.android.sdk.model.toFiatString
 import co.electriccoin.zcash.ui.screen.request.ext.convertToDouble
-import co.electriccoin.zcash.ui.screen.request.model.MemoState.Valid
 
 data class Request(
     val amountState: AmountState,
@@ -114,8 +112,5 @@ sealed class MemoState(
 data class QrCodeState(
     val requestUri: String,
     val zecAmount: String,
-    val memo: String,
-    val bitmap: ImageBitmap?
-) {
-    fun isValid(): Boolean = bitmap != null
-}
+    val memo: String
+)

ui-lib/src/main/java/co/electriccoin/zcash/ui/screen/request/model/RequestState.kt

@@ -1,6 +1,5 @@
 package co.electriccoin.zcash.ui.screen.request.model
 
-import androidx.compose.ui.graphics.ImageBitmap
 import cash.z.ecc.android.sdk.model.MonetarySeparators
 import cash.z.ecc.android.sdk.model.WalletAddress
 import cash.z.ecc.sdk.type.ZcashCurrency
@@ -40,8 +39,7 @@ internal sealed class RequestState {
         val request: Request,
         val walletAddress: WalletAddress,
         val onQrCodeClick: () -> Unit,
-        val onQrCodeShare: (ImageBitmap) -> Unit,
-        val onQrCodeGenerate: (pixels: Int, colors: QrCodeColors) -> Unit,
+        val onQrCodeShare: (colors: QrCodeColors, pixels: Int, uri: String) -> Unit,
         override val onBack: () -> Unit,
         val onClose: () -> Unit,
         val zcashCurrency: ZcashCurrency,
@@ -50,7 +48,7 @@ internal sealed class RequestState {
             contentDescription: StringResource? = null,
             centerImageResId: Int? = null,
         ) = QrState(
-            qrData = walletAddress.address,
+            qrData = request.qrCodeState.requestUri,
             onClick = onQrCodeClick,
             contentDescription = contentDescription,
             centerImageResId = centerImageResId

ui-lib/src/main/java/co/electriccoin/zcash/ui/screen/request/view/RequestView.kt

@@ -16,6 +16,7 @@ import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalDensity
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.AnnotatedString
 import androidx.compose.ui.text.TextStyle
@@ -30,6 +31,7 @@ import co.electriccoin.zcash.ui.common.model.TopAppBarSubTitleState
 import co.electriccoin.zcash.ui.common.wallet.ExchangeRateState
 import co.electriccoin.zcash.ui.design.component.BlankBgScaffold
 import co.electriccoin.zcash.ui.design.component.CircularScreenProgressIndicator
+import co.electriccoin.zcash.ui.design.component.QrCodeDefaults
 import co.electriccoin.zcash.ui.design.component.ZashiBottomBar
 import co.electriccoin.zcash.ui.design.component.ZashiButton
 import co.electriccoin.zcash.ui.design.component.ZashiButtonDefaults
@@ -43,6 +45,7 @@ import co.electriccoin.zcash.ui.screen.request.model.QrCodeState
 import co.electriccoin.zcash.ui.screen.request.model.Request
 import co.electriccoin.zcash.ui.screen.request.model.RequestCurrency
 import co.electriccoin.zcash.ui.screen.request.model.RequestState
+import kotlin.math.roundToInt
 
 @Composable
 @PreviewScreens
@@ -71,7 +74,6 @@ private fun RequestPreview() =
                                     "zcash:t1duiEGg7b39nfQee3XaTY4f5McqfyJKhBi?amount=1&memo=VGhpcyBpcyBhIHNpbXBsZSBt",
                                     "0.25",
                                     memo = "Text memo",
-                                    null
                                 ),
                         ),
                     exchangeRateState = ExchangeRateState.OptedOut,
@@ -172,11 +174,13 @@ private fun RequestBottomBar(
                 )
             }
             is RequestState.QrCode -> {
+                val sizePixels = with(LocalDensity.current) { DEFAULT_QR_CODE_SIZE.toPx() }.roundToInt()
+                val colors = QrCodeDefaults.colors()
+
                 ZashiButton(
                     text = stringResource(id = R.string.request_qr_share_btn),
                     icon = R.drawable.ic_share,
-                    enabled = state.request.qrCodeState.isValid(),
-                    onClick = { state.onQrCodeShare(state.request.qrCodeState.bitmap!!) },
+                    onClick = { state.onQrCodeShare(colors, sizePixels, state.request.qrCodeState.requestUri) },
                     modifier =
                         Modifier
                             .fillMaxWidth()
@@ -199,6 +203,8 @@ private fun RequestBottomBar(
     }
 }
 
+private val DEFAULT_QR_CODE_SIZE = 320.dp
+
 @Composable
 private fun RequestContents(
     state: RequestState.Prepared,

ui-lib/src/main/java/co/electriccoin/zcash/ui/screen/request/viewmodel/RequestViewModel.kt

@@ -34,11 +34,14 @@ import co.electriccoin.zcash.ui.screen.request.model.Request
 import co.electriccoin.zcash.ui.screen.request.model.RequestCurrency
 import co.electriccoin.zcash.ui.screen.request.model.RequestStage
 import co.electriccoin.zcash.ui.screen.request.model.RequestState
+import kotlinx.coroutines.channels.awaitClose
 import kotlinx.coroutines.flow.MutableSharedFlow
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.SharingStarted
 import kotlinx.coroutines.flow.WhileSubscribed
+import kotlinx.coroutines.flow.callbackFlow
 import kotlinx.coroutines.flow.combine
+import kotlinx.coroutines.flow.filterNotNull
 import kotlinx.coroutines.flow.stateIn
 import kotlinx.coroutines.launch
 
@@ -67,7 +70,7 @@ class RequestViewModel(
             Request(
                 amountState = AmountState.Default(defaultAmount, RequestCurrency.Zec),
                 memoState = MemoState.Valid(DEFAULT_MEMO, 0, defaultAmount),
-                qrCodeState = QrCodeState(DEFAULT_URI, defaultAmount, DEFAULT_MEMO, null),
+                qrCodeState = QrCodeState(DEFAULT_URI, defaultAmount, DEFAULT_MEMO),
             )
         )
 
@@ -137,18 +140,18 @@ class RequestViewModel(
                             },
                         walletAddress = walletAddress,
                         request = request,
-                        onQrCodeGenerate = { pixels, colors ->
-                            qrCodeForValue(
-                                value = request.qrCodeState.requestUri,
-                                size = pixels,
-                                colors = colors,
-                            )
-                        },
                         onQrCodeClick = {
                             // TODO [#1731]: Allow QR codes colors switching
                             // TODO [#1731]: https://github.com/Electric-Coin-Company/zashi-android/issues/1731
                         },
-                        onQrCodeShare = { onRequestQrCodeShare(it, shareImageBitmap) },
+                        onQrCodeShare = { colors, pixels, uri ->
+                            onShareQrCode(
+                                colors = colors,
+                                pixels = pixels,
+                                requestUri = uri,
+                                shareImageBitmap = shareImageBitmap
+                            )
+                        },
                         onBack = ::onBack,
                         onClose = ::onClose,
                         zcashCurrency = getZcashCurrency(),
@@ -270,6 +273,22 @@ class RequestViewModel(
         } ?: newAmount
     }
 
+    private fun onShareQrCode(
+        colors: QrCodeColors,
+        pixels: Int,
+        requestUri: String,
+        shareImageBitmap: ShareImageUseCase,
+    ) = viewModelScope.launch {
+        bitmapForData(
+            value = requestUri,
+            size = pixels,
+            colors = colors,
+        ).filterNotNull()
+            .collect { bitmap ->
+                onRequestQrCodeShare(bitmap, shareImageBitmap)
+            }
+    }
+
     internal fun onBack() =
         viewModelScope.launch {
             when (stage.value) {
@@ -329,7 +348,6 @@ class RequestViewModel(
                             ),
                         zecAmount = request.value.memoState.zecAmount,
                         memo = request.value.memoState.text,
-                        bitmap = null
                     )
             )
         )
@@ -365,7 +383,6 @@ class RequestViewModel(
                             ),
                         zecAmount = qrCodeAmount,
                         memo = DEFAULT_MEMO,
-                        bitmap = null
                     )
             )
         request.emit(newRequest)
@@ -452,22 +469,26 @@ class RequestViewModel(
         }
     }
 
-    private fun qrCodeForValue(
+    private fun bitmapForData(
         value: String,
         size: Int,
         colors: QrCodeColors
-    ) = viewModelScope.launch {
-        // In the future, use actual/expect to switch QR code generator implementations for multiplatform
+    ) = callbackFlow {
+        viewModelScope.launch {
+            // In the future, use actual/expect to switch QR code generator implementations for multiplatform
 
-        // Note that our implementation has an extra array copy to BooleanArray, which is a cross-platform
-        // representation.  This should have minimal performance impact since the QR code is relatively
-        // small and we only generate QR codes infrequently.
+            // Note that our implementation has an extra array copy to BooleanArray, which is a cross-platform
+            // representation.  This should have minimal performance impact since the QR code is relatively
+            // small and we only generate QR codes infrequently.
 
-        val qrCodePixelArray = JvmQrCodeGenerator.generate(value, size)
-        val bitmap = AndroidQrCodeImageGenerator.generate(qrCodePixelArray, size, colors)
+            val qrCodePixelArray = JvmQrCodeGenerator.generate(value, size)
+            val bitmap = AndroidQrCodeImageGenerator.generate(qrCodePixelArray, size, colors)
 
-        val newQrCodeState = request.value.qrCodeState.copy(bitmap = bitmap)
-        request.emit(request.value.copy(qrCodeState = newQrCodeState))
+            trySend(bitmap)
+        }
+        awaitClose {
+            // No resources to release
+        }
     }
 }
 

ui-lib/src/main/java/co/electriccoin/zcash/ui/screen/send/SendViewModel.kt

@@ -138,7 +138,7 @@ class SendViewModel(
         try {
             createProposal(newZecSend)
         } catch (e: Exception) {
-            setSendStage(SendStage.SendFailure(""))
+            setSendStage(SendStage.SendFailure(e.cause?.message ?: e.message ?: ""))
             Twig.error(e) { "Error creating proposal" }
         }
     }
@@ -151,7 +151,7 @@ class SendViewModel(
         try {
             createKeystoneZip321TransactionProposal(zip321Uri)
         } catch (e: Exception) {
-            setSendStage(SendStage.SendFailure(""))
+            setSendStage(SendStage.SendFailure(e.cause?.message ?: e.message ?: ""))
             Twig.error(e) { "Error creating proposal" }
         }
     }