[pos] migrate order posting and checking to v1 API and merchant-lib

1 files changed, 63 insertions, 0 deletions

diff --git a/merchant-lib/src/main/java/net/taler/merchantlib/Response.kt b/merchant-lib/src/main/java/net/taler/merchantlib/Response.kt
new file mode 100644
index 0000000..23fa101
--- /dev/null
+++ b/merchant-lib/src/main/java/net/taler/merchantlib/Response.kt
@@ -0,0 +1,63 @@
+/*
+ * 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.merchantlib
+
+import io.ktor.client.call.receive
+import io.ktor.client.features.ClientRequestException
+import kotlinx.serialization.Serializable
+
+class Response<out T> private constructor(
+    private val value: Any?
+) {
+
+    companion object {
+        fun <T> success(value: T): Response<T> =
+            Response(value)
+
+        fun <T> failure(e: Throwable): Response<T> =
+            Response(Failure(e))
+    }
+
+    val isFailure: Boolean get() = value is Failure
+
+    suspend fun handle(onFailure: ((String) -> Any)? = null, onSuccess: ((T) -> Any)? = null) {
+        if (value is Failure) onFailure?.let { it(getFailureString(value)) }
+        else onSuccess?.let {
+            @Suppress("UNCHECKED_CAST")
+            it(value as T)
+        }
+    }
+
+    private suspend fun getFailureString(failure: Failure): String = when (failure.exception) {
+        is ClientRequestException -> getExceptionString(failure.exception)
+        else -> failure.exception.toString()
+    }
+
+    private suspend fun getExceptionString(e: ClientRequestException): String {
+        val error: Error = e.response.receive()
+        return "Error ${error.code}: ${error.hint}"
+    }
+
+    private class Failure(val exception: Throwable)
+
+    @Serializable
+    private class Error(
+        val code: Int?,
+        val hint: String?
+    )
+
+}