1 files changed, 38 insertions, 0 deletions
diff --git a/src/main/kotlin/moe/nea/ledger/utils/telemetry/ExceptionContextValue.kt b/src/main/kotlin/moe/nea/ledger/utils/telemetry/ExceptionContextValue.kt
new file mode 100644
index 0000000..df588a8
--- /dev/null
+++ b/src/main/kotlin/moe/nea/ledger/utils/telemetry/ExceptionContextValue.kt
@@ -0,0 +1,38 @@
+package moe.nea.ledger.utils.telemetry
+
+import com.google.gson.JsonArray
+import com.google.gson.JsonElement
+import com.google.gson.JsonObject
+
+class ExceptionContextValue(val exception: Throwable) : ContextValue {
+	val stackTrace by lazy {
+		exception.stackTraceToString()
+	}
+
+	override fun serialize(): JsonElement {
+		val jsonObject = JsonObject()
+		jsonObject.addProperty("exception_stackTrace", stackTrace)
+		jsonObject.add("exception_structure", walkExceptions(exception, 6))
+		return jsonObject
+	}
+
+	private fun walkExceptions(exception: Throwable, searchDepth: Int): JsonElement {
+		val obj = JsonObject()
+		obj.addProperty("class", exception.javaClass.name)
+		obj.addProperty("message", exception.message)
+		// TODO: allow exceptions to implement an "extra info" interface
+		if (searchDepth > 0) {
+			if (exception.cause != null) {
+				obj.add("cause", walkExceptions(exception, searchDepth - 1))
+			}
+			val suppressions = JsonArray()
+			for (suppressedException in exception.suppressedExceptions) {
+				suppressions.add(walkExceptions(suppressedException, searchDepth - 1))
+			}
+			if (suppressions.size() > 0) {
+				obj.add("suppressions", suppressions)
+			}
+		}
+		return obj
+	}
+}