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Moves cashu processing to a state class to account for errors.

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This commit is contained in:
Vitor Pamplona 2023-06-26 20:17:35 -04:00
parent 9bed6fdb9a
commit 833e6bc3e1
3 changed files with 42 additions and 18 deletions
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31
app/src/main/java/com/vitorpamplona/amethyst/service/CashuProcessor.kt
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@ -6,6 +6,7 @@ import com.google.gson.JsonArray
import com.google.gson.JsonObject
import com.google.gson.JsonParser
import com.vitorpamplona.amethyst.service.lnurl.LightningAddressResolver
import com.vitorpamplona.amethyst.ui.components.GenericLoadable
import okhttp3.MediaType.Companion.toMediaType
import okhttp3.Request
import okhttp3.RequestBody.Companion.toRequestBody
@ -21,21 +22,25 @@ data class CashuToken(
)
class CashuProcessor {
fun parse(cashutoken: String): CashuToken {
val base64token = cashutoken.replace("cashuA", "")
val cashu = JsonParser.parseString(String(Base64.getDecoder().decode(base64token)))
val token = cashu.asJsonObject.get("token").asJsonArray[0].asJsonObject
val proofs = token["proofs"].asJsonArray
val mint = token["mint"].asString
fun parse(cashuToken: String): GenericLoadable<CashuToken> {
try {
val base64token = cashuToken.replace("cashuA", "")
val cashu = JsonParser.parseString(String(Base64.getDecoder().decode(base64token)))
val token = cashu.asJsonObject.get("token").asJsonArray[0].asJsonObject
val proofs = token["proofs"].asJsonArray
val mint = token["mint"].asString
var totalAmount = 0L
for (proof in proofs) {
totalAmount += proof.asJsonObject["amount"].asLong
var totalAmount = 0L
for (proof in proofs) {
totalAmount += proof.asJsonObject["amount"].asLong
}
val fees = Math.max(((totalAmount * 0.02).toInt()), 2)
val redeemInvoiceAmount = totalAmount - fees
return GenericLoadable.Loaded(CashuToken(mint, totalAmount, fees, redeemInvoiceAmount, proofs))
} catch (e: Exception) {
return GenericLoadable.Error<CashuToken>("Could not parse this cashu token")
}
val fees = Math.max(((totalAmount * 0.02).toInt()), 2)
val redeemInvoiceAmount = totalAmount - fees
return CashuToken(mint, totalAmount, fees, redeemInvoiceAmount, proofs)
}
fun melt(token: CashuToken, lud16: String, onSuccess: (String) -> Unit, onError: (String) -> Unit) {

10
app/src/main/java/com/vitorpamplona/amethyst/ui/components/CashuRedeem.kt
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@ -35,7 +35,7 @@ import kotlinx.coroutines.launch
@Composable
fun CashuPreview(cashutoken: String, accountViewModel: AccountViewModel) {
var cachuData by remember { mutableStateOf<CashuToken?>(null) }
var cachuData by remember { mutableStateOf<GenericLoadable<CashuToken>>(GenericLoadable.Loading<CashuToken>()) }
LaunchedEffect(key1 = cashutoken) {
launch(Dispatchers.IO) {
@ -44,13 +44,13 @@ fun CashuPreview(cashutoken: String, accountViewModel: AccountViewModel) {
}
Crossfade(targetState = cachuData) {
if (it != null) {
CashuPreview(it, accountViewModel)
} else {
Text(
when (it) {
is GenericLoadable.Loaded<CashuToken> -> CashuPreview(it.loaded, accountViewModel)
is GenericLoadable.Error<CashuToken> -> Text(
text = "$cashutoken ",
style = LocalTextStyle.current.copy(textDirection = TextDirection.Content)
)
else -> {}
}
}
}

19
app/src/main/java/com/vitorpamplona/amethyst/ui/components/GenericLoadable.kt Normal file
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@ -0,0 +1,19 @@
package com.vitorpamplona.amethyst.ui.components
import androidx.compose.runtime.Immutable
@Immutable
sealed class GenericLoadable<T> {
@Immutable
class Loading<T> : GenericLoadable<T>()
@Immutable
class Loaded<T>(val loaded: T) : GenericLoadable<T>()
@Immutable
class Empty<T> : GenericLoadable<T>()
@Immutable
class Error<T>(val errorMessage: String) : GenericLoadable<T>()
}