server: Add TransactionService

server/app/com/xsn/explorer/services/TransactionService.scala

@@ -0,0 +1,28 @@
+package com.xsn.explorer.services
+
+import javax.inject.Inject
+
+import com.alexitc.playsonify.core.FutureApplicationResult
+import com.alexitc.playsonify.core.FutureOr.Implicits.{FutureOps, OrOps}
+import com.xsn.explorer.errors.TransactionFormatError
+import com.xsn.explorer.models.TransactionId
+import org.scalactic.{One, Or}
+import play.api.libs.json.JsValue
+
+import scala.concurrent.ExecutionContext
+
+class TransactionService @Inject() (xsnService: XSNService)(implicit ec: ExecutionContext) {
+
+  def getTransaction(txidString: String): FutureApplicationResult[JsValue] = {
+    val result = for {
+      txid <- {
+        val maybe = TransactionId.from(txidString)
+        Or.from(maybe, One(TransactionFormatError)).toFutureOr
+      }
+
+      transaction <- xsnService.getTransaction(txid).toFutureOr
+    } yield transaction
+
+    result.toFuture
+  }
+}