Merge pull request #320 from fd4s/preserve-throwable

Preserve original exception when converting to AvroError

build.sbt

@@ -279,7 +279,8 @@ lazy val mimaSettings = Seq(
       ProblemFilters.exclude[IncompatibleSignatureProblem]("*"),
       ProblemFilters.exclude[DirectMissingMethodProblem]("vulcan.Codec.withDecodingTypeName"),
       ProblemFilters.exclude[DirectMissingMethodProblem]("vulcan.AvroError.decode*"),
-      ProblemFilters.exclude[DirectMissingMethodProblem]("vulcan.AvroError.encode*")
+      ProblemFilters.exclude[DirectMissingMethodProblem]("vulcan.AvroError.encode*"),
+      ProblemFilters.exclude[DirectMissingMethodProblem]("vulcan.AvroException.*")
     )
     // format: on
   }

modules/core/src/main/scala/vulcan/AvroError.scala

@@ -275,6 +275,11 @@ object AvroError {
       s"Symbol $symbol is not part of schema symbols [${symbols.mkString(", ")}]"
     }
 
-  private[vulcan] final def fromThrowable(throwable: Throwable): AvroError =
-    AvroError(throwable.toString)
+  private[vulcan] final def fromThrowable(cause: Throwable): AvroError = {
+    new AvroError {
+      def message: String = cause.toString
+
+      def throwable: Throwable = AvroException(message, Some(cause))
+    }
+  }
 }

modules/core/src/main/scala/vulcan/AvroException.scala

@@ -10,11 +10,12 @@ package vulcan
   * `Throwable` representation of an [[AvroError]],
   * created with [[AvroError#throwable]].
   */
-sealed abstract class AvroException(message: String) extends RuntimeException(message)
+sealed abstract class AvroException(message: String, cause: Option[Throwable])
+    extends RuntimeException(message, cause.orNull)
 
 private[vulcan] object AvroException {
-  final def apply(message: String): AvroException =
-    new AvroException(message) {
+  final def apply(message: String, cause: Option[Throwable] = None): AvroException =
+    new AvroException(message, cause) {
       override final def toString: String =
         s"vulcan.AvroException: $getMessage"
     }