Make Span kind an enum in otel.stef (#202)

Resolves #200

Author: tigrannajaryan

go/otel/otel.stef

@@ -42,7 +42,7 @@ struct Span {
   ParentSpanID bytes
   Flags uint64
   Name string dict(SpanName)
-  Kind uint64
+  Kind SpanKind
   StartTimeUnixNano uint64
   EndTimeUnixNano uint64
   Attributes Attributes
@@ -52,6 +52,15 @@ struct Span {
   Status SpanStatus
 }
 
+enum SpanKind {
+  Unspecified = 0
+  Internal = 1
+  Server = 2
+  Client = 3
+  Producer = 4
+  Consumer = 5
+}
+
 oneof PointValue {
   Int64 int64
   Float64 float64

go/otel/oteltef/common.go

@@ -125,7 +125,7 @@ func span2span(src ptrace.Span, dst *oteltef.Span, otlp2tef *otlptools.Otlp2Stef
 	dst.SetFlags(uint64(src.Flags()))
 	dst.SetStartTimeUnixNano(uint64(src.StartTimestamp()))
 	dst.SetEndTimeUnixNano(uint64(src.EndTimestamp()))
-	dst.SetKind(uint64(src.Kind()))
+	dst.SetKind(oteltef.SpanKind(src.Kind()))
 	dst.SetTraceState(src.TraceState().AsRaw())
 	if sorted {
 		otlp2tef.MapSorted(src.Attributes(), dst.Attributes())

go/otel/oteltef/span.go

@@ -703,7 +703,7 @@ void mutateRandom(Random random) {
         }
 
         if (random.nextInt(fieldCount) == 0) {
-            this.setKind(Types.Uint64Random(random));
+            this.setKind((Types.Uint64Random(random) & 0x7FFFFFFFFFFFFFFFL) % 6);
         }
 
         if (random.nextInt(fieldCount) == 0) {

go/otel/oteltef/spankind.go

@@ -0,0 +1,14 @@
+// Code generated by stefc. DO NOT EDIT.
+package com.example.oteltef;
+
+public class SpanKind {
+    public static final long Unspecified = 0;
+    public static final long Internal = 1;
+    public static final long Server = 2;
+    public static final long Client = 3;
+    public static final long Producer = 4;
+    public static final long Consumer = 5;
+
+    // Private constructor to prevent instantiation
+    private SpanKind() {}
+}